File: //proc/1526/task/1530/cwd/zaklada/html/node_modules/jshint/src/jshint.js
/*!
* JSHint, by JSHint Community.
*
* This file (and this file only) is licensed under the same slightly modified
* MIT license that JSLint is. It stops evil-doers everywhere:
*
* Copyright (c) 2002 Douglas Crockford (www.JSLint.com)
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom
* the Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* The Software shall be used for Good, not Evil.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*
*/
/*jshint quotmark:double */
/*exported console */
var _ = require("lodash");
var events = require("events");
var vars = require("./vars.js");
var messages = require("./messages.js");
var Lexer = require("./lex.js").Lexer;
var reg = require("./reg.js");
var state = require("./state.js").state;
var style = require("./style.js");
var options = require("./options.js");
var scopeManager = require("./scope-manager.js");
// We need this module here because environments such as IE and Rhino
// don't necessarilly expose the 'console' API and browserify uses
// it to log things. It's a sad state of affair, really.
var console = require("console-browserify");
// We build the application inside a function so that we produce only a singleton
// variable. That function will be invoked immediately, and its return value is
// the JSHINT function itself.
var JSHINT = (function() {
"use strict";
var api, // Extension API
// These are operators that should not be used with the ! operator.
bang = {
"<" : true,
"<=" : true,
"==" : true,
"===": true,
"!==": true,
"!=" : true,
">" : true,
">=" : true,
"+" : true,
"-" : true,
"*" : true,
"/" : true,
"%" : true
},
declared, // Globals that were declared using /*global ... */ syntax.
functions, // All of the functions
inblock,
indent,
lookahead,
lex,
member,
membersOnly,
predefined, // Global variables defined by option
urls,
extraModules = [],
emitter = new events.EventEmitter();
function checkOption(name, t) {
name = name.trim();
if (/^[+-]W\d{3}$/g.test(name)) {
return true;
}
if (options.validNames.indexOf(name) === -1) {
if (t.type !== "jslint" && !_.has(options.removed, name)) {
error("E001", t, name);
return false;
}
}
return true;
}
function isString(obj) {
return Object.prototype.toString.call(obj) === "[object String]";
}
function isIdentifier(tkn, value) {
if (!tkn)
return false;
if (!tkn.identifier || tkn.value !== value)
return false;
return true;
}
function isReserved(token) {
if (!token.reserved) {
return false;
}
var meta = token.meta;
if (meta && meta.isFutureReservedWord) {
if (meta.moduleOnly && !state.option.module) {
return false;
}
if (state.inES5()) {
// ES3 FutureReservedWord in an ES5 environment.
if (!meta.es5) {
return false;
}
// Some ES5 FutureReservedWord identifiers are active only
// within a strict mode environment.
if (meta.strictOnly) {
if (!state.option.strict && !state.isStrict()) {
return false;
}
}
if (token.isProperty) {
return false;
}
}
}
return true;
}
function supplant(str, data) {
return str.replace(/\{([^{}]*)\}/g, function(a, b) {
var r = data[b];
return typeof r === "string" || typeof r === "number" ? r : a;
});
}
function combine(dest, src) {
Object.keys(src).forEach(function(name) {
if (_.has(JSHINT.blacklist, name)) return;
dest[name] = src[name];
});
}
function processenforceall() {
if (state.option.enforceall) {
for (var enforceopt in options.bool.enforcing) {
if (state.option[enforceopt] === undefined &&
!options.noenforceall[enforceopt]) {
state.option[enforceopt] = true;
}
}
for (var relaxopt in options.bool.relaxing) {
if (state.option[relaxopt] === undefined) {
state.option[relaxopt] = false;
}
}
}
}
/**
* Apply all linting options according to the status of the `state` object.
*/
function applyOptions() {
var badESOpt = null;
processenforceall();
/**
* TODO: Remove in JSHint 3
*/
badESOpt = state.inferEsVersion();
if (badESOpt) {
quit("E059", state.tokens.next, "esversion", badESOpt);
}
if (state.inES5()) {
combine(predefined, vars.ecmaIdentifiers[5]);
}
if (state.inES6()) {
combine(predefined, vars.ecmaIdentifiers[6]);
}
/**
* Use `in` to check for the presence of any explicitly-specified value for
* `globalstrict` because both `true` and `false` should trigger an error.
*/
if (state.option.strict === "global" && "globalstrict" in state.option) {
quit("E059", state.tokens.next, "strict", "globalstrict");
}
if (state.option.module) {
/**
* TODO: Extend this restriction to *all* ES6-specific options.
*/
if (!state.inES6()) {
warning("W134", state.tokens.next, "module", 6);
}
}
if (state.option.couch) {
combine(predefined, vars.couch);
}
if (state.option.qunit) {
combine(predefined, vars.qunit);
}
if (state.option.rhino) {
combine(predefined, vars.rhino);
}
if (state.option.shelljs) {
combine(predefined, vars.shelljs);
combine(predefined, vars.node);
}
if (state.option.typed) {
combine(predefined, vars.typed);
}
if (state.option.phantom) {
combine(predefined, vars.phantom);
}
if (state.option.prototypejs) {
combine(predefined, vars.prototypejs);
}
if (state.option.node) {
combine(predefined, vars.node);
combine(predefined, vars.typed);
}
if (state.option.devel) {
combine(predefined, vars.devel);
}
if (state.option.dojo) {
combine(predefined, vars.dojo);
}
if (state.option.browser) {
combine(predefined, vars.browser);
combine(predefined, vars.typed);
}
if (state.option.browserify) {
combine(predefined, vars.browser);
combine(predefined, vars.typed);
combine(predefined, vars.browserify);
}
if (state.option.nonstandard) {
combine(predefined, vars.nonstandard);
}
if (state.option.jasmine) {
combine(predefined, vars.jasmine);
}
if (state.option.jquery) {
combine(predefined, vars.jquery);
}
if (state.option.mootools) {
combine(predefined, vars.mootools);
}
if (state.option.worker) {
combine(predefined, vars.worker);
}
if (state.option.wsh) {
combine(predefined, vars.wsh);
}
if (state.option.yui) {
combine(predefined, vars.yui);
}
if (state.option.mocha) {
combine(predefined, vars.mocha);
}
}
// Produce an error warning.
function quit(code, token, a, b) {
var percentage = Math.floor((token.line / state.lines.length) * 100);
var message = messages.errors[code].desc;
var exception = {
name: "JSHintError",
line: token.line,
character: token.from,
message: message + " (" + percentage + "% scanned).",
raw: message,
code: code,
a: a,
b: b
};
exception.reason = supplant(message, exception) + " (" + percentage +
"% scanned).";
throw exception;
}
function removeIgnoredMessages() {
var ignored = state.ignoredLines;
if (_.isEmpty(ignored)) return;
JSHINT.errors = _.reject(JSHINT.errors, function(err) { return ignored[err.line] });
}
function warning(code, t, a, b, c, d) {
var ch, l, w, msg;
if (/^W\d{3}$/.test(code)) {
if (state.ignored[code])
return;
msg = messages.warnings[code];
} else if (/E\d{3}/.test(code)) {
msg = messages.errors[code];
} else if (/I\d{3}/.test(code)) {
msg = messages.info[code];
}
t = t || state.tokens.next || {};
if (t.id === "(end)") { // `~
t = state.tokens.curr;
}
l = t.line;
ch = t.from;
w = {
id: "(error)",
raw: msg.desc,
code: msg.code,
evidence: state.lines[l - 1] || "",
line: l,
character: ch,
scope: JSHINT.scope,
a: a,
b: b,
c: c,
d: d
};
w.reason = supplant(msg.desc, w);
JSHINT.errors.push(w);
removeIgnoredMessages();
if (JSHINT.errors.length >= state.option.maxerr)
quit("E043", t);
return w;
}
function warningAt(m, l, ch, a, b, c, d) {
return warning(m, {
line: l,
from: ch
}, a, b, c, d);
}
function error(m, t, a, b, c, d) {
warning(m, t, a, b, c, d);
}
function errorAt(m, l, ch, a, b, c, d) {
return error(m, {
line: l,
from: ch
}, a, b, c, d);
}
// Tracking of "internal" scripts, like eval containing a static string
function addEvalCode(elem, token) {
JSHINT.internals.push({
id: "(internal)",
elem: elem,
token: token,
code: token.value.replace(/([^\\])(\\*)\2\\n/g, "$1\n")
});
}
/**
* Process an inline linting directive
*
* @param {Token} directiveToken - the directive-bearing comment token
* @param {Token} previous - the token that preceeds the directive
*/
function lintingDirective(directiveToken, previous) {
var body = directiveToken.body.split(",")
.map(function(s) { return s.trim(); });
var predef = {};
if (directiveToken.type === "falls through") {
previous.caseFallsThrough = true;
return;
}
if (directiveToken.type === "globals") {
body.forEach(function(g, idx) {
g = g.split(":");
var key = g[0].trim();
var val = (g[1] || "").trim();
if (key === "-" || !key.length) {
// Ignore trailing comma
if (idx > 0 && idx === body.length - 1) {
return;
}
error("E002", directiveToken);
return;
}
if (key.charAt(0) === "-") {
key = key.slice(1);
val = false;
JSHINT.blacklist[key] = key;
delete predefined[key];
} else {
predef[key] = (val === "true");
}
});
combine(predefined, predef);
for (var key in predef) {
if (_.has(predef, key)) {
declared[key] = directiveToken;
}
}
}
if (directiveToken.type === "exported") {
body.forEach(function(e, idx) {
if (!e.length) {
// Ignore trailing comma
if (idx > 0 && idx === body.length - 1) {
return;
}
error("E002", directiveToken);
return;
}
state.funct["(scope)"].addExported(e);
});
}
if (directiveToken.type === "members") {
membersOnly = membersOnly || {};
body.forEach(function(m) {
var ch1 = m.charAt(0);
var ch2 = m.charAt(m.length - 1);
if (ch1 === ch2 && (ch1 === "\"" || ch1 === "'")) {
m = m
.substr(1, m.length - 2)
.replace("\\\"", "\"");
}
membersOnly[m] = false;
});
}
var numvals = [
"maxstatements",
"maxparams",
"maxdepth",
"maxcomplexity",
"maxerr",
"maxlen",
"indent"
];
if (directiveToken.type === "jshint" || directiveToken.type === "jslint") {
body.forEach(function(g) {
g = g.split(":");
var key = g[0].trim();
var val = (g[1] || "").trim();
if (!checkOption(key, directiveToken)) {
return;
}
if (numvals.indexOf(key) >= 0) {
// GH988 - numeric options can be disabled by setting them to `false`
if (val !== "false") {
val = +val;
if (typeof val !== "number" || !isFinite(val) || val <= 0 || Math.floor(val) !== val) {
error("E032", directiveToken, g[1].trim());
return;
}
state.option[key] = val;
} else {
state.option[key] = key === "indent" ? 4 : false;
}
return;
}
if (key === "validthis") {
// `validthis` is valid only within a function scope.
if (state.funct["(global)"])
return void error("E009");
if (val !== "true" && val !== "false")
return void error("E002", directiveToken);
state.option.validthis = (val === "true");
return;
}
if (key === "quotmark") {
switch (val) {
case "true":
case "false":
state.option.quotmark = (val === "true");
break;
case "double":
case "single":
state.option.quotmark = val;
break;
default:
error("E002", directiveToken);
}
return;
}
if (key === "shadow") {
switch (val) {
case "true":
state.option.shadow = true;
break;
case "outer":
state.option.shadow = "outer";
break;
case "false":
case "inner":
state.option.shadow = "inner";
break;
default:
error("E002", directiveToken);
}
return;
}
if (key === "unused") {
switch (val) {
case "true":
state.option.unused = true;
break;
case "false":
state.option.unused = false;
break;
case "vars":
case "strict":
state.option.unused = val;
break;
default:
error("E002", directiveToken);
}
return;
}
if (key === "latedef") {
switch (val) {
case "true":
state.option.latedef = true;
break;
case "false":
state.option.latedef = false;
break;
case "nofunc":
state.option.latedef = "nofunc";
break;
default:
error("E002", directiveToken);
}
return;
}
if (key === "ignore") {
switch (val) {
case "line":
state.ignoredLines[directiveToken.line] = true;
removeIgnoredMessages();
break;
default:
error("E002", directiveToken);
}
return;
}
if (key === "strict") {
switch (val) {
case "true":
state.option.strict = true;
break;
case "false":
state.option.strict = false;
break;
case "global":
case "implied":
state.option.strict = val;
break;
default:
error("E002", directiveToken);
}
return;
}
if (key === "module") {
/**
* TODO: Extend this restriction to *all* "environmental" options.
*/
if (!hasParsedCode(state.funct)) {
error("E055", directiveToken, "module");
}
}
if (key === "esversion") {
switch (val) {
case "3":
case "5":
case "6":
case "2015":
state.option.moz = false;
state.option.esversion = +val;
break;
default:
error("E002", directiveToken);
}
if (!hasParsedCode(state.funct)) {
error("E055", directiveToken, "esversion");
}
return;
}
var match = /^([+-])(W\d{3})$/g.exec(key);
if (match) {
// ignore for -W..., unignore for +W...
state.ignored[match[2]] = (match[1] === "-");
return;
}
var tn;
if (val === "true" || val === "false") {
if (directiveToken.type === "jslint") {
tn = options.renamed[key] || key;
state.option[tn] = (val === "true");
if (options.inverted[tn] !== undefined) {
state.option[tn] = !state.option[tn];
}
} else {
state.option[key] = (val === "true");
}
return;
}
error("E002", directiveToken);
});
applyOptions();
}
}
/**
* Return a token beyond the token available in `state.tokens.next`. If no
* such token exists, return the "(end)" token. This function is used to
* determine parsing strategies in cases where the value of the next token
* does not provide sufficient information, as is the case with `for` loops,
* e.g.:
*
* for ( var i in ...
*
* versus:
*
* for ( var i = ...
*
* @param {number} [p] - offset of desired token; defaults to 0
*
* @returns {token}
*/
function peek(p) {
var i = p || 0, j = lookahead.length, t;
if (i < j) {
return lookahead[i];
}
while (j <= i) {
t = lex.token();
// When the lexer is exhausted, this function should produce the "(end)"
// token, even in cases where the requested token is beyond the end of
// the input stream.
if (!t) {
// If the lookahead buffer is empty, the expected "(end)" token was
// already emitted by the most recent invocation of `advance` and is
// available as the next token.
if (!lookahead.length) {
return state.tokens.next;
}
return lookahead[j - 1];
}
lookahead[j] = t;
j += 1;
}
return t;
}
function peekIgnoreEOL() {
var i = 0;
var t;
do {
t = peek(i++);
} while (t.id === "(endline)");
return t;
}
// Produce the next token. It looks for programming errors.
function advance(id, t) {
switch (state.tokens.curr.id) {
case "(number)":
if (state.tokens.next.id === ".") {
warning("W005", state.tokens.curr);
}
break;
case "-":
if (state.tokens.next.id === "-" || state.tokens.next.id === "--") {
warning("W006");
}
break;
case "+":
if (state.tokens.next.id === "+" || state.tokens.next.id === "++") {
warning("W007");
}
break;
}
if (id && state.tokens.next.id !== id) {
if (t) {
if (state.tokens.next.id === "(end)") {
error("E019", t, t.id);
} else {
error("E020", state.tokens.next, id, t.id, t.line, state.tokens.next.value);
}
} else if (state.tokens.next.type !== "(identifier)" || state.tokens.next.value !== id) {
warning("W116", state.tokens.next, id, state.tokens.next.value);
}
}
state.tokens.prev = state.tokens.curr;
state.tokens.curr = state.tokens.next;
for (;;) {
state.tokens.next = lookahead.shift() || lex.token();
if (!state.tokens.next) { // No more tokens left, give up
quit("E041", state.tokens.curr);
}
if (state.tokens.next.id === "(end)" || state.tokens.next.id === "(error)") {
return;
}
if (state.tokens.next.check) {
state.tokens.next.check();
}
if (state.tokens.next.isSpecial) {
lintingDirective(state.tokens.next, state.tokens.curr);
} else {
if (state.tokens.next.id !== "(endline)") {
break;
}
}
}
}
/**
* Determine whether a given token is an operator.
*
* @param {token} token
*
* @returns {boolean}
*/
function isOperator(token) {
return token.first || token.right || token.left || token.id === "yield";
}
function isEndOfExpr(curr, next) {
if (arguments.length === 0) {
curr = state.tokens.curr;
next = state.tokens.next;
}
if (next.id === ";" || next.id === "}" || next.id === ":") {
return true;
}
if (next.infix === curr.infix || curr.ltBoundary === "after" ||
next.ltBoundary === "before") {
return curr.line !== startLine(next);
}
return false;
}
// This is the heart of JSHINT, the Pratt parser. In addition to parsing, it
// is looking for ad hoc lint patterns. We add .fud to Pratt's model, which is
// like .nud except that it is only used on the first token of a statement.
// Having .fud makes it much easier to define statement-oriented languages like
// JavaScript. I retained Pratt's nomenclature.
// .nud Null denotation
// .fud First null denotation
// .led Left denotation
// lbp Left binding power
// rbp Right binding power
// They are elements of the parsing method called Top Down Operator Precedence.
function expression(rbp, initial) {
var left, isArray = false, isObject = false, isLetExpr = false;
state.nameStack.push();
// if current expression is a let expression
if (!initial && state.tokens.next.value === "let" && peek(0).value === "(") {
if (!state.inMoz()) {
warning("W118", state.tokens.next, "let expressions");
}
isLetExpr = true;
// create a new block scope we use only for the current expression
state.funct["(scope)"].stack();
advance("let");
advance("(");
state.tokens.prev.fud();
advance(")");
}
if (state.tokens.next.id === "(end)")
error("E006", state.tokens.curr);
advance();
if (initial) {
state.funct["(verb)"] = state.tokens.curr.value;
state.tokens.curr.beginsStmt = true;
}
if (initial === true && state.tokens.curr.fud) {
left = state.tokens.curr.fud();
} else {
if (state.tokens.curr.nud) {
left = state.tokens.curr.nud(rbp);
} else {
error("E030", state.tokens.curr, state.tokens.curr.id);
}
while (rbp < state.tokens.next.lbp && !isEndOfExpr()) {
isArray = state.tokens.curr.value === "Array";
isObject = state.tokens.curr.value === "Object";
// #527, new Foo.Array(), Foo.Array(), new Foo.Object(), Foo.Object()
// Line breaks in IfStatement heads exist to satisfy the checkJSHint
// "Line too long." error.
if (left && (left.value || (left.first && left.first.value))) {
// If the left.value is not "new", or the left.first.value is a "."
// then safely assume that this is not "new Array()" and possibly
// not "new Object()"...
if (left.value !== "new" ||
(left.first && left.first.value && left.first.value === ".")) {
isArray = false;
// ...In the case of Object, if the left.value and state.tokens.curr.value
// are not equal, then safely assume that this not "new Object()"
if (left.value !== state.tokens.curr.value) {
isObject = false;
}
}
}
advance();
if (isArray && state.tokens.curr.id === "(" && state.tokens.next.id === ")") {
warning("W009", state.tokens.curr);
}
if (isObject && state.tokens.curr.id === "(" && state.tokens.next.id === ")") {
warning("W010", state.tokens.curr);
}
if (left && state.tokens.curr.led) {
left = state.tokens.curr.led(left);
} else {
error("E033", state.tokens.curr, state.tokens.curr.id);
}
}
}
if (isLetExpr) {
state.funct["(scope)"].unstack();
}
state.nameStack.pop();
return left;
}
// Functions for conformance of style.
function startLine(token) {
return token.startLine || token.line;
}
function nobreaknonadjacent(left, right) {
if (!state.option.laxbreak && left.line !== startLine(right)) {
warning("W014", right, right.value);
}
}
function nolinebreak(t) {
t = t;
if (t.line !== startLine(state.tokens.next)) {
warning("E022", t, t.value);
}
}
function nobreakcomma(left, right) {
if (left.line !== startLine(right)) {
if (!state.option.laxcomma) {
if (parseComma.first) {
warning("I001");
parseComma.first = false;
}
warning("W014", left, right.value);
}
}
}
function parseComma(opts) {
opts = opts || {};
if (!opts.peek) {
nobreakcomma(state.tokens.curr, state.tokens.next);
advance(",");
} else {
nobreakcomma(state.tokens.prev, state.tokens.curr);
}
if (state.tokens.next.identifier && !(opts.property && state.inES5())) {
// Keywords that cannot follow a comma operator.
switch (state.tokens.next.value) {
case "break":
case "case":
case "catch":
case "continue":
case "default":
case "do":
case "else":
case "finally":
case "for":
case "if":
case "in":
case "instanceof":
case "return":
case "switch":
case "throw":
case "try":
case "var":
case "let":
case "while":
case "with":
error("E024", state.tokens.next, state.tokens.next.value);
return false;
}
}
if (state.tokens.next.type === "(punctuator)") {
switch (state.tokens.next.value) {
case "}":
case "]":
case ",":
if (opts.allowTrailing) {
return true;
}
/* falls through */
case ")":
error("E024", state.tokens.next, state.tokens.next.value);
return false;
}
}
return true;
}
// Functional constructors for making the symbols that will be inherited by
// tokens.
function symbol(s, p) {
var x = state.syntax[s];
if (!x || typeof x !== "object") {
state.syntax[s] = x = {
id: s,
lbp: p,
value: s
};
}
return x;
}
function delim(s) {
var x = symbol(s, 0);
x.delim = true;
return x;
}
function stmt(s, f) {
var x = delim(s);
x.identifier = x.reserved = true;
x.fud = f;
return x;
}
function blockstmt(s, f) {
var x = stmt(s, f);
x.block = true;
return x;
}
function reserveName(x) {
var c = x.id.charAt(0);
if ((c >= "a" && c <= "z") || (c >= "A" && c <= "Z")) {
x.identifier = x.reserved = true;
}
return x;
}
function prefix(s, f) {
var x = symbol(s, 150);
reserveName(x);
x.nud = (typeof f === "function") ? f : function() {
this.arity = "unary";
this.right = expression(150);
if (this.id === "++" || this.id === "--") {
if (state.option.plusplus) {
warning("W016", this, this.id);
}
if (this.right) {
checkLeftSideAssign(this.right, this);
}
}
return this;
};
return x;
}
function type(s, f) {
var x = delim(s);
x.type = s;
x.nud = f;
return x;
}
function reserve(name, func) {
var x = type(name, func);
x.identifier = true;
x.reserved = true;
return x;
}
function FutureReservedWord(name, meta) {
var x = type(name, (meta && meta.nud) || function() {
return this;
});
meta = meta || {};
meta.isFutureReservedWord = true;
x.value = name;
x.identifier = true;
x.reserved = true;
x.meta = meta;
return x;
}
function reservevar(s, v) {
return reserve(s, function() {
if (typeof v === "function") {
v(this);
}
return this;
});
}
function infix(s, f, p, w) {
var x = symbol(s, p);
reserveName(x);
x.infix = true;
x.led = function(left) {
if (!w) {
nobreaknonadjacent(state.tokens.prev, state.tokens.curr);
}
if ((s === "in" || s === "instanceof") && left.id === "!") {
warning("W018", left, "!");
}
if (typeof f === "function") {
return f(left, this);
} else {
this.left = left;
this.right = expression(p);
return this;
}
};
return x;
}
function application(s) {
var x = symbol(s, 42);
x.infix = true;
x.led = function(left) {
nobreaknonadjacent(state.tokens.prev, state.tokens.curr);
this.left = left;
this.right = doFunction({ type: "arrow", loneArg: left });
return this;
};
return x;
}
function relation(s, f) {
var x = symbol(s, 100);
x.infix = true;
x.led = function(left) {
nobreaknonadjacent(state.tokens.prev, state.tokens.curr);
this.left = left;
var right = this.right = expression(100);
if (isIdentifier(left, "NaN") || isIdentifier(right, "NaN")) {
warning("W019", this);
} else if (f) {
f.apply(this, [left, right]);
}
if (!left || !right) {
quit("E041", state.tokens.curr);
}
if (left.id === "!") {
warning("W018", left, "!");
}
if (right.id === "!") {
warning("W018", right, "!");
}
return this;
};
return x;
}
var typeofValues = {};
typeofValues.legacy = [
// E4X extended the `typeof` operator to return "xml" for the XML and
// XMLList types it introduced.
// Ref: 11.3.2 The typeof Operator
// http://www.ecma-international.org/publications/files/ECMA-ST/Ecma-357.pdf
"xml",
// IE<9 reports "unknown" when the `typeof` operator is applied to an
// object existing across a COM+ bridge. In lieu of official documentation
// (which does not exist), see:
// http://robertnyman.com/2005/12/21/what-is-typeof-unknown/
"unknown"
];
typeofValues.es3 = [
"undefined", "boolean", "number", "string", "function", "object",
];
typeofValues.es3 = typeofValues.es3.concat(typeofValues.legacy);
typeofValues.es6 = typeofValues.es3.concat("symbol");
// Checks whether the 'typeof' operator is used with the correct
// value. For docs on 'typeof' see:
// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/typeof
function isTypoTypeof(left, right, state) {
var values;
if (state.option.notypeof)
return false;
if (!left || !right)
return false;
values = state.inES6() ? typeofValues.es6 : typeofValues.es3;
if (right.type === "(identifier)" && right.value === "typeof" && left.type === "(string)")
return !_.includes(values, left.value);
return false;
}
function isGlobalEval(left, state) {
var isGlobal = false;
// permit methods to refer to an "eval" key in their own context
if (left.type === "this" && state.funct["(context)"] === null) {
isGlobal = true;
}
// permit use of "eval" members of objects
else if (left.type === "(identifier)") {
if (state.option.node && left.value === "global") {
isGlobal = true;
}
else if (state.option.browser && (left.value === "window" || left.value === "document")) {
isGlobal = true;
}
}
return isGlobal;
}
function findNativePrototype(left) {
var natives = [
"Array", "ArrayBuffer", "Boolean", "Collator", "DataView", "Date",
"DateTimeFormat", "Error", "EvalError", "Float32Array", "Float64Array",
"Function", "Infinity", "Intl", "Int16Array", "Int32Array", "Int8Array",
"Iterator", "Number", "NumberFormat", "Object", "RangeError",
"ReferenceError", "RegExp", "StopIteration", "String", "SyntaxError",
"TypeError", "Uint16Array", "Uint32Array", "Uint8Array", "Uint8ClampedArray",
"URIError"
];
function walkPrototype(obj) {
if (typeof obj !== "object") return;
return obj.right === "prototype" ? obj : walkPrototype(obj.left);
}
function walkNative(obj) {
while (!obj.identifier && typeof obj.left === "object")
obj = obj.left;
if (obj.identifier && natives.indexOf(obj.value) >= 0 &&
state.funct["(scope)"].isPredefined(obj.value)) {
return obj.value;
}
}
var prototype = walkPrototype(left);
if (prototype) return walkNative(prototype);
}
/**
* Checks the left hand side of an assignment for issues, returns if ok
* @param {token} left - the left hand side of the assignment
* @param {token=} assignToken - the token for the assignment, used for reporting
* @param {object=} options - optional object
* @param {boolean} options.allowDestructuring - whether to allow destructuting binding
* @returns {boolean} Whether the left hand side is OK
*/
function checkLeftSideAssign(left, assignToken, options) {
var allowDestructuring = options && options.allowDestructuring;
assignToken = assignToken || left;
if (state.option.freeze) {
var nativeObject = findNativePrototype(left);
if (nativeObject)
warning("W121", left, nativeObject);
}
if (checkPunctuator(left, "...")) {
left = left.right;
}
if (left.identifier && !left.isMetaProperty) {
// reassign also calls modify
// but we are specific in order to catch function re-assignment
// and globals re-assignment
state.funct["(scope)"].block.reassign(left.value, left);
}
if (left.id === ".") {
if (!left.left || left.left.value === "arguments" && !state.isStrict()) {
warning("W143", assignToken);
}
state.nameStack.set(state.tokens.prev);
return true;
} else if (left.id === "{" || left.id === "[") {
if (!allowDestructuring || !left.destructAssign) {
if (left.id === "{" || !left.left) {
warning("E031", assignToken);
} else if (left.left.value === "arguments" && !state.isStrict()) {
warning("W143", assignToken);
}
}
if (left.id === "[") {
state.nameStack.set(left.right);
}
return true;
} else if (left.identifier && !isReserved(left) && !left.isMetaProperty &&
left.value !== "eval" && left.value !== "arguments") {
if (state.funct["(scope)"].labeltype(left.value) === "exception") {
warning("W022", left);
}
state.nameStack.set(left);
return true;
}
error("E031", assignToken);
return false;
}
function assignop(s, f, p) {
var x = infix(s, typeof f === "function" ? f : function(left, that) {
that.left = left;
checkLeftSideAssign(left, that, { allowDestructuring: true });
that.right = expression(10);
return that;
}, p);
x.exps = true;
x.assign = true;
return x;
}
function bitwise(s, f, p) {
var x = symbol(s, p);
reserveName(x);
x.infix = true;
x.led = (typeof f === "function") ? f : function(left) {
if (state.option.bitwise) {
warning("W016", this, this.id);
}
this.left = left;
this.right = expression(p);
return this;
};
return x;
}
function bitwiseassignop(s) {
return assignop(s, function(left, that) {
if (state.option.bitwise) {
warning("W016", that, that.id);
}
checkLeftSideAssign(left, that);
that.right = expression(10);
return that;
}, 20);
}
function suffix(s) {
var x = symbol(s, 150);
x.led = function(left) {
// this = suffix e.g. "++" punctuator
// left = symbol operated e.g. "a" identifier or "a.b" punctuator
if (state.option.plusplus) {
warning("W016", this, this.id);
}
checkLeftSideAssign(left, this);
this.left = left;
return this;
};
return x;
}
// prop means that this identifier is that of an object property
function optionalidentifier(prop, preserve) {
if (!state.tokens.next.identifier) {
return;
}
if (!preserve) {
advance();
}
var curr = state.tokens.curr;
var val = state.tokens.curr.value;
if (!isReserved(curr)) {
return val;
}
if (prop) {
if (state.inES5()) {
return val;
}
}
warning("W024", state.tokens.curr, state.tokens.curr.id);
return val;
}
// prop means that this identifier is that of an object property
function identifier(prop) {
var i = optionalidentifier(prop, false);
if (i) {
return i;
}
// parameter destructuring with rest operator
if (state.tokens.next.value === "...") {
if (!state.inES6(true)) {
warning("W119", state.tokens.next, "spread/rest operator", "6");
}
advance();
if (checkPunctuator(state.tokens.next, "...")) {
warning("E024", state.tokens.next, "...");
while (checkPunctuator(state.tokens.next, "...")) {
advance();
}
}
if (!state.tokens.next.identifier) {
warning("E024", state.tokens.curr, state.tokens.next.id);
return;
}
return identifier(prop);
} else {
error("E030", state.tokens.next, state.tokens.next.value);
// The token should be consumed after a warning is issued so the parser
// can continue as though an identifier were found. The semicolon token
// should not be consumed in this way so that the parser interprets it as
// a statement delimeter;
if (state.tokens.next.id !== ";") {
advance();
}
}
}
function reachable(controlToken) {
var i = 0, t;
if (state.tokens.next.id !== ";" || controlToken.inBracelessBlock) {
return;
}
for (;;) {
do {
t = peek(i);
i += 1;
} while (t.id !== "(end)" && t.id === "(comment)");
if (t.reach) {
return;
}
if (t.id !== "(endline)") {
if (t.id === "function") {
if (state.option.latedef === true) {
warning("W026", t);
}
break;
}
warning("W027", t, t.value, controlToken.value);
break;
}
}
}
/**
* Consume the semicolon that delimits the statement currently being parsed,
* emitting relevant warnings/errors as appropriate.
*
* @param {token} stmt - token describing the statement under consideration
*/
function parseFinalSemicolon(stmt) {
if (state.tokens.next.id !== ";") {
// don't complain about unclosed templates / strings
if (state.tokens.next.isUnclosed) return advance();
var sameLine = startLine(state.tokens.next) === state.tokens.curr.line &&
state.tokens.next.id !== "(end)";
var blockEnd = checkPunctuator(state.tokens.next, "}");
if (sameLine && !blockEnd && !(stmt.id === "do" && state.inES6(true))) {
errorAt("E058", state.tokens.curr.line, state.tokens.curr.character);
} else if (!state.option.asi) {
// If this is the last statement in a block that ends on
// the same line *and* option lastsemic is on, ignore the warning.
// Otherwise, complain about missing semicolon.
if (!(blockEnd && sameLine && state.option.lastsemic)) {
warningAt("W033", state.tokens.curr.line, state.tokens.curr.character);
}
}
} else {
advance(";");
}
}
function statement() {
var i = indent, r, t = state.tokens.next, hasOwnScope = false;
if (t.id === ";") {
advance(";");
return;
}
// Is this a labelled statement?
var res = isReserved(t);
// We're being more tolerant here: if someone uses
// a FutureReservedWord as a label, we warn but proceed
// anyway.
if (res && t.meta && t.meta.isFutureReservedWord && peek().id === ":") {
warning("W024", t, t.id);
res = false;
}
if (t.identifier && !res && peek().id === ":") {
advance();
advance(":");
hasOwnScope = true;
state.funct["(scope)"].stack();
state.funct["(scope)"].block.addBreakLabel(t.value, { token: state.tokens.curr });
if (!state.tokens.next.labelled && state.tokens.next.value !== "{") {
warning("W028", state.tokens.next, t.value, state.tokens.next.value);
}
t = state.tokens.next;
}
// Is it a lonely block?
if (t.id === "{") {
// Is it a switch case block?
//
// switch (foo) {
// case bar: { <= here.
// ...
// }
// }
var iscase = (state.funct["(verb)"] === "case" && state.tokens.curr.value === ":");
block(true, true, false, false, iscase);
if (hasOwnScope) {
state.funct["(scope)"].unstack();
}
return;
}
// Parse the statement.
r = expression(0, true);
if (r && !(r.identifier && r.value === "function") &&
!(r.type === "(punctuator)" && r.left &&
r.left.identifier && r.left.value === "function")) {
if (!state.isStrict() && state.stmtMissingStrict()) {
warning("E007");
}
}
// Look for the final semicolon.
if (!t.block) {
if (!state.option.expr && (!r || !r.exps)) {
warning("W030", state.tokens.curr);
} else if (state.option.nonew && r && r.left && r.id === "(" && r.left.id === "new") {
warning("W031", t);
}
parseFinalSemicolon(t);
}
// Restore the indentation.
indent = i;
if (hasOwnScope) {
state.funct["(scope)"].unstack();
}
return r;
}
function statements() {
var a = [], p;
while (!state.tokens.next.reach && state.tokens.next.id !== "(end)") {
if (state.tokens.next.id === ";") {
p = peek();
if (!p || (p.id !== "(" && p.id !== "[")) {
warning("W032");
}
advance(";");
} else {
a.push(statement());
}
}
return a;
}
/*
* read all directives
*/
function directives() {
var current = state.tokens.next;
while (state.tokens.next.id === "(string)") {
var next = peekIgnoreEOL();
if (!isEndOfExpr(current, next)) {
break;
}
current = next;
advance();
var directive = state.tokens.curr.value;
if (state.directive[directive] ||
(directive === "use strict" && state.option.strict === "implied")) {
warning("W034", state.tokens.curr, directive);
}
// there's no directive negation, so always set to true
state.directive[directive] = true;
parseFinalSemicolon(current);
}
if (state.isStrict()) {
state.option.undef = true;
}
}
/*
* Parses a single block. A block is a sequence of statements wrapped in
* braces.
*
* ordinary - true for everything but function bodies and try blocks.
* stmt - true if block can be a single statement (e.g. in if/for/while).
* isfunc - true if block is a function body
* isfatarrow - true if its a body of a fat arrow function
* iscase - true if block is a switch case block
*/
function block(ordinary, stmt, isfunc, isfatarrow, iscase) {
var a,
b = inblock,
old_indent = indent,
m,
t,
d;
inblock = ordinary;
t = state.tokens.next;
var metrics = state.funct["(metrics)"];
metrics.nestedBlockDepth += 1;
metrics.verifyMaxNestedBlockDepthPerFunction();
if (state.tokens.next.id === "{") {
advance("{");
// create a new block scope
state.funct["(scope)"].stack();
state.funct["(noblockscopedvar)"] = false;
if (state.tokens.next.id !== "}") {
indent += state.option.indent;
while (!ordinary && state.tokens.next.from > indent) {
indent += state.option.indent;
}
if (isfunc) {
m = {};
for (d in state.directive) {
m[d] = state.directive[d];
}
directives();
state.funct["(isStrict)"] = state.isStrict();
if (state.option.strict && state.funct["(context)"]["(global)"]) {
if (!m["use strict"] && !state.isStrict()) {
warning("E007");
}
}
}
a = statements();
metrics.statementCount += a.length;
indent -= state.option.indent;
} else if (isfunc) {
// Ensure property is set for functions with empty bodies.
state.funct["(isStrict)"] = state.isStrict();
}
advance("}", t);
if (isfunc) {
state.funct["(scope)"].validateParams(isfatarrow);
if (m) {
state.directive = m;
}
}
state.funct["(scope)"].unstack();
indent = old_indent;
} else if (!ordinary) {
if (isfunc) {
state.funct["(scope)"].stack();
if (stmt && !isfatarrow && !state.inMoz()) {
error("W118", state.tokens.curr, "function closure expressions");
}
if (isfatarrow) {
state.funct["(scope)"].validateParams(true);
}
expression(10);
if (state.option.strict && state.funct["(context)"]["(global)"]) {
if (!state.isStrict()) {
warning("E007");
}
}
state.funct["(scope)"].unstack();
} else {
error("E021", state.tokens.next, "{", state.tokens.next.value);
}
} else {
// check to avoid let declaration not within a block
// though is fine inside for loop initializer section
state.funct["(noblockscopedvar)"] = state.tokens.next.id !== "for";
state.funct["(scope)"].stack();
if (!stmt || state.option.curly) {
warning("W116", state.tokens.next, "{", state.tokens.next.value);
}
state.tokens.next.inBracelessBlock = true;
indent += state.option.indent;
// test indentation only if statement is in new line
a = [statement()];
indent -= state.option.indent;
state.funct["(scope)"].unstack();
delete state.funct["(noblockscopedvar)"];
}
// Don't clear and let it propagate out if it is "break", "return" or similar in switch case
switch (state.funct["(verb)"]) {
case "break":
case "continue":
case "return":
case "throw":
if (iscase) {
break;
}
/* falls through */
default:
state.funct["(verb)"] = null;
}
inblock = b;
if (ordinary && state.option.noempty && (!a || a.length === 0)) {
warning("W035", state.tokens.prev);
}
metrics.nestedBlockDepth -= 1;
return a;
}
function countMember(m) {
if (membersOnly && typeof membersOnly[m] !== "boolean") {
warning("W036", state.tokens.curr, m);
}
if (typeof member[m] === "number") {
member[m] += 1;
} else {
member[m] = 1;
}
}
// Build the syntax table by declaring the syntactic elements of the language.
type("(number)", function() {
return this;
});
type("(string)", function() {
return this;
});
state.syntax["(identifier)"] = {
type: "(identifier)",
lbp: 0,
identifier: true,
nud: function() {
var v = this.value;
// If this identifier is the lone parameter to a shorthand "fat arrow"
// function definition, i.e.
//
// x => x;
//
// ...it should not be considered as a variable in the current scope. It
// will be added to the scope of the new function when the next token is
// parsed, so it can be safely ignored for now.
if (state.tokens.next.id === "=>") {
return this;
}
if (!state.funct["(comparray)"].check(v)) {
state.funct["(scope)"].block.use(v, state.tokens.curr);
}
return this;
},
led: function() {
error("E033", state.tokens.next, state.tokens.next.value);
}
};
var baseTemplateSyntax = {
identifier: false,
template: true,
};
state.syntax["(template)"] = _.extend({
lbp: 155,
type: "(template)",
nud: doTemplateLiteral,
led: doTemplateLiteral,
noSubst: false
}, baseTemplateSyntax);
state.syntax["(template middle)"] = _.extend({
lbp: 0,
type: "(template middle)",
noSubst: false
}, baseTemplateSyntax);
state.syntax["(template tail)"] = _.extend({
lbp: 0,
type: "(template tail)",
tail: true,
noSubst: false
}, baseTemplateSyntax);
state.syntax["(no subst template)"] = _.extend({
lbp: 155,
type: "(template)",
nud: doTemplateLiteral,
led: doTemplateLiteral,
noSubst: true,
tail: true // mark as tail, since it's always the last component
}, baseTemplateSyntax);
type("(regexp)", function() {
return this;
});
// ECMAScript parser
delim("(endline)");
(function(x) {
x.line = x.from = 0;
})(delim("(begin)"));
delim("(end)").reach = true;
delim("(error)").reach = true;
delim("}").reach = true;
delim(")");
delim("]");
delim("\"").reach = true;
delim("'").reach = true;
delim(";");
delim(":").reach = true;
delim("#");
reserve("else");
reserve("case").reach = true;
reserve("catch");
reserve("default").reach = true;
reserve("finally");
reserve("true", function() { return this; });
reserve("false", function() { return this; });
reservevar("null");
reservevar("this", function(x) {
if (state.isStrict() && !isMethod() &&
!state.option.validthis && ((state.funct["(statement)"] &&
state.funct["(name)"].charAt(0) > "Z") || state.funct["(global)"])) {
warning("W040", x);
}
});
assignop("=", "assign", 20);
assignop("+=", "assignadd", 20);
assignop("-=", "assignsub", 20);
assignop("*=", "assignmult", 20);
assignop("/=", "assigndiv", 20).nud = function() {
error("E014");
};
assignop("%=", "assignmod", 20);
bitwiseassignop("&=");
bitwiseassignop("|=");
bitwiseassignop("^=");
bitwiseassignop("<<=");
bitwiseassignop(">>=");
bitwiseassignop(">>>=");
infix(",", function(left, that) {
var expr;
that.exprs = [left];
if (state.option.nocomma) {
warning("W127");
}
if (!parseComma({ peek: true })) {
return that;
}
while (true) {
if (!(expr = expression(10))) {
break;
}
that.exprs.push(expr);
if (state.tokens.next.value !== "," || !parseComma()) {
break;
}
}
return that;
}, 10, true);
infix("?", function(left, that) {
increaseComplexityCount();
that.left = left;
that.right = expression(10);
advance(":");
expression(10);
return that;
}, 30);
var orPrecendence = 40;
infix("||", function(left, that) {
increaseComplexityCount();
that.left = left;
that.right = expression(orPrecendence);
return that;
}, orPrecendence);
infix("&&", "and", 50);
bitwise("|", "bitor", 70);
bitwise("^", "bitxor", 80);
bitwise("&", "bitand", 90);
relation("==", function(left, right) {
var eqnull = state.option.eqnull &&
((left && left.value) === "null" || (right && right.value) === "null");
switch (true) {
case !eqnull && state.option.eqeqeq:
this.from = this.character;
warning("W116", this, "===", "==");
break;
case isTypoTypeof(right, left, state):
warning("W122", this, right.value);
break;
case isTypoTypeof(left, right, state):
warning("W122", this, left.value);
break;
}
return this;
});
relation("===", function(left, right) {
if (isTypoTypeof(right, left, state)) {
warning("W122", this, right.value);
} else if (isTypoTypeof(left, right, state)) {
warning("W122", this, left.value);
}
return this;
});
relation("!=", function(left, right) {
var eqnull = state.option.eqnull &&
((left && left.value) === "null" || (right && right.value) === "null");
if (!eqnull && state.option.eqeqeq) {
this.from = this.character;
warning("W116", this, "!==", "!=");
} else if (isTypoTypeof(right, left, state)) {
warning("W122", this, right.value);
} else if (isTypoTypeof(left, right, state)) {
warning("W122", this, left.value);
}
return this;
});
relation("!==", function(left, right) {
if (isTypoTypeof(right, left, state)) {
warning("W122", this, right.value);
} else if (isTypoTypeof(left, right, state)) {
warning("W122", this, left.value);
}
return this;
});
relation("<");
relation(">");
relation("<=");
relation(">=");
bitwise("<<", "shiftleft", 120);
bitwise(">>", "shiftright", 120);
bitwise(">>>", "shiftrightunsigned", 120);
infix("in", "in", 120);
infix("instanceof", function(left, token) {
var right;
var scope = state.funct["(scope)"];
token.left = left;
token.right = right = expression(120);
// This condition reflects a syntax error which will be reported by the
// `expression` function.
if (!right) {
return token;
}
if (right.id === "(number)" ||
right.id === "(string)" ||
right.value === "null" ||
(right.value === "undefined" && !scope.has("undefined")) ||
right.arity === "unary" ||
right.id === "{" ||
(right.id === "[" && !right.right) ||
right.id === "(regexp)" ||
(right.id === "(template)" && !right.tag)) {
error("E060");
}
if (right.id === "function") {
warning("W139");
}
return token;
}, 120);
infix("+", function(left, that) {
var right;
that.left = left;
that.right = right = expression(130);
if (left && right && left.id === "(string)" && right.id === "(string)") {
left.value += right.value;
left.character = right.character;
if (!state.option.scripturl && reg.javascriptURL.test(left.value)) {
warning("W050", left);
}
return left;
}
return that;
}, 130);
prefix("+", "num");
infix("-", "sub", 130);
prefix("-", "neg");
infix("*", "mult", 140);
infix("/", "div", 140);
infix("%", "mod", 140);
suffix("++");
prefix("++", "preinc");
state.syntax["++"].exps = true;
state.syntax["++"].ltBoundary = "before";
suffix("--");
prefix("--", "predec");
state.syntax["--"].exps = true;
state.syntax["--"].ltBoundary = "before";
prefix("delete", function() {
var p = expression(10);
if (!p) {
return this;
}
if (p.id !== "." && p.id !== "[") {
warning("W051");
}
this.first = p;
// The `delete` operator accepts unresolvable references when not in strict
// mode, so the operand may be undefined.
if (p.identifier && !state.isStrict()) {
p.forgiveUndef = true;
}
return this;
}).exps = true;
prefix("~", function() {
if (state.option.bitwise) {
warning("W016", this, "~");
}
this.arity = "unary";
this.right = expression(150);
return this;
});
prefix("...", function() {
if (!state.inES6(true)) {
warning("W119", this, "spread/rest operator", "6");
}
// TODO: Allow all AssignmentExpression
// once parsing permits.
//
// How to handle eg. number, boolean when the built-in
// prototype of may have an @@iterator definition?
//
// Number.prototype[Symbol.iterator] = function * () {
// yield this.valueOf();
// };
//
// var a = [ ...1 ];
// console.log(a); // [1];
//
// for (let n of [...10]) {
// console.log(n);
// }
// // 10
//
//
// Boolean.prototype[Symbol.iterator] = function * () {
// yield this.valueOf();
// };
//
// var a = [ ...true ];
// console.log(a); // [true];
//
// for (let n of [...false]) {
// console.log(n);
// }
// // false
//
if (!state.tokens.next.identifier &&
state.tokens.next.type !== "(string)" &&
!checkPunctuators(state.tokens.next, ["[", "("])) {
error("E030", state.tokens.next, state.tokens.next.value);
}
this.right = expression(150);
return this;
});
prefix("!", function() {
this.arity = "unary";
this.right = expression(150);
if (!this.right) { // '!' followed by nothing? Give up.
quit("E041", this);
}
if (bang[this.right.id] === true) {
warning("W018", this, "!");
}
return this;
});
prefix("typeof", (function() {
var p = expression(150);
this.first = this.right = p;
if (!p) { // 'typeof' followed by nothing? Give up.
quit("E041", this);
}
// The `typeof` operator accepts unresolvable references, so the operand
// may be undefined.
if (p.identifier) {
p.forgiveUndef = true;
}
return this;
}));
prefix("new", function() {
var mp = metaProperty("target", function() {
if (!state.inES6(true)) {
warning("W119", state.tokens.prev, "new.target", "6");
}
var inFunction, c = state.funct;
while (c) {
inFunction = !c["(global)"];
if (!c["(arrow)"]) { break; }
c = c["(context)"];
}
if (!inFunction) {
warning("W136", state.tokens.prev, "new.target");
}
});
if (mp) { return mp; }
var c = expression(155), i;
if (c && c.id !== "function") {
if (c.identifier) {
switch (c.value) {
case "Number":
case "String":
case "Boolean":
case "Math":
case "JSON":
warning("W053", state.tokens.prev, c.value);
break;
case "Symbol":
if (state.inES6()) {
warning("W053", state.tokens.prev, c.value);
}
break;
case "Function":
if (!state.option.evil) {
warning("W054");
}
break;
case "Date":
case "RegExp":
case "this":
break;
default:
if (c.id !== "function") {
i = c.value.substr(0, 1);
if (state.option.newcap && (i < "A" || i > "Z") &&
!state.funct["(scope)"].isPredefined(c.value)) {
warning("W055", state.tokens.curr);
}
}
}
} else {
if (c.id !== "." && c.id !== "[" && c.id !== "(") {
warning("W056", state.tokens.curr);
}
}
} else {
if (!state.option.supernew)
warning("W057", this);
}
if (state.tokens.next.id !== "(" && !state.option.supernew) {
warning("W058", state.tokens.curr, state.tokens.curr.value);
}
this.first = this.right = c;
return this;
});
state.syntax["new"].exps = true;
prefix("void").exps = true;
infix(".", function(left, that) {
var m = identifier(true);
if (typeof m === "string") {
countMember(m);
}
that.left = left;
that.right = m;
if (m && m === "hasOwnProperty" && state.tokens.next.value === "=") {
warning("W001");
}
if (left && left.value === "arguments" && (m === "callee" || m === "caller")) {
if (state.option.noarg)
warning("W059", left, m);
else if (state.isStrict())
error("E008");
} else if (!state.option.evil && left && left.value === "document" &&
(m === "write" || m === "writeln")) {
warning("W060", left);
}
if (!state.option.evil && (m === "eval" || m === "execScript")) {
if (isGlobalEval(left, state)) {
warning("W061");
}
}
return that;
}, 160, true);
infix("(", function(left, that) {
if (state.option.immed && left && !left.immed && left.id === "function") {
warning("W062");
}
if (state.option.asi && checkPunctuators(state.tokens.prev, [")", "]"]) &&
state.tokens.prev.line !== startLine(state.tokens.curr)) {
warning("W014", state.tokens.curr, state.tokens.curr.id);
}
var n = 0;
var p = [];
if (left) {
if (left.type === "(identifier)") {
if (left.value.match(/^[A-Z]([A-Z0-9_$]*[a-z][A-Za-z0-9_$]*)?$/)) {
if ("Array Number String Boolean Date Object Error Symbol".indexOf(left.value) === -1) {
if (left.value === "Math") {
warning("W063", left);
} else if (state.option.newcap) {
warning("W064", left);
}
}
}
}
}
if (state.tokens.next.id !== ")") {
for (;;) {
p[p.length] = expression(10);
n += 1;
if (state.tokens.next.id !== ",") {
break;
}
parseComma();
}
}
advance(")");
if (typeof left === "object") {
if (!state.inES5() && left.value === "parseInt" && n === 1) {
warning("W065", state.tokens.curr);
}
if (!state.option.evil) {
if (left.value === "eval" || left.value === "Function" ||
left.value === "execScript") {
warning("W061", left);
// This conditional expression was initially implemented with a typo
// which prevented the branch's execution in all cases. While
// enabling the code will produce behavior that is consistent with
// the other forms of code evaluation that follow, such a change is
// also technically incompatable with prior versions of JSHint (due
// to the fact that the behavior was never formally documented). This
// branch should be enabled as part of a major release.
//if (p[0] && p[0].id === "(string)") {
// addEvalCode(left, p[0]);
//}
} else if (p[0] && p[0].id === "(string)" &&
(left.value === "setTimeout" ||
left.value === "setInterval")) {
warning("W066", left);
addEvalCode(left, p[0]);
// window.setTimeout/setInterval
} else if (p[0] && p[0].id === "(string)" &&
left.value === "." &&
left.left.value === "window" &&
(left.right === "setTimeout" ||
left.right === "setInterval")) {
warning("W066", left);
addEvalCode(left, p[0]);
}
}
if (!left.identifier && left.id !== "." && left.id !== "[" && left.id !== "=>" &&
left.id !== "(" && left.id !== "&&" && left.id !== "||" && left.id !== "?" &&
!(state.inES6() && left["(name)"])) {
warning("W067", that);
}
}
that.left = left;
return that;
}, 155, true).exps = true;
prefix("(", function(rbp) {
var pn = state.tokens.next, pn1, i = -1;
var ret, triggerFnExpr, first, last;
var parens = 1;
var opening = state.tokens.curr;
var preceeding = state.tokens.prev;
var isNecessary = !state.option.singleGroups;
do {
if (pn.value === "(") {
parens += 1;
} else if (pn.value === ")") {
parens -= 1;
}
i += 1;
pn1 = pn;
pn = peek(i);
} while (!(parens === 0 && pn1.value === ")") && pn.type !== "(end)");
if (state.tokens.next.id === "function") {
triggerFnExpr = state.tokens.next.immed = true;
}
// If the balanced grouping operator is followed by a "fat arrow", the
// current token marks the beginning of a "fat arrow" function and parsing
// should proceed accordingly.
if (pn.value === "=>") {
return doFunction({ type: "arrow", parsedOpening: true });
}
var exprs = [];
if (state.tokens.next.id !== ")") {
for (;;) {
exprs.push(expression(10));
if (state.tokens.next.id !== ",") {
break;
}
if (state.option.nocomma) {
warning("W127");
}
parseComma();
}
}
advance(")", this);
if (state.option.immed && exprs[0] && exprs[0].id === "function") {
if (state.tokens.next.id !== "(" &&
state.tokens.next.id !== "." && state.tokens.next.id !== "[") {
warning("W068", this);
}
}
if (!exprs.length) {
return;
}
if (exprs.length > 1) {
ret = Object.create(state.syntax[","]);
ret.exprs = exprs;
first = exprs[0];
last = exprs[exprs.length - 1];
} else {
ret = first = last = exprs[0];
if (!isNecessary) {
isNecessary =
// Used to distinguish from an ExpressionStatement which may not
// begin with the `{` and `function` tokens
(opening.beginsStmt && (ret.id === "{" || triggerFnExpr || isFunctor(ret))) ||
// Used to signal that a function expression is being supplied to
// some other operator.
(triggerFnExpr &&
// For parenthesis wrapping a function expression to be considered
// necessary, the grouping operator should be the left-hand-side of
// some other operator--either within the parenthesis or directly
// following them.
(!isEndOfExpr() || state.tokens.prev.id !== "}")) ||
// Used to demarcate an arrow function as the left-hand side of some
// operator.
(isFunctor(ret) && !isEndOfExpr()) ||
// Used as the return value of a single-statement arrow function
(ret.id === "{" && preceeding.id === "=>") ||
// Used to delineate an integer number literal from a dereferencing
// punctuator (otherwise interpreted as a decimal point)
(ret.type === "(number)" &&
checkPunctuator(pn, ".") && /^\d+$/.test(ret.value)) ||
// Used to wrap object destructuring assignment
(opening.beginsStmt && ret.id === "=" && ret.left.id === "{");
}
}
if (ret) {
// The operator may be necessary to override the default binding power of
// neighboring operators (whenever there is an operator in use within the
// first expression *or* the current group contains multiple expressions)
if (!isNecessary && (isOperator(first) || ret.exprs)) {
isNecessary =
(rbp > first.lbp) ||
(rbp > 0 && rbp === first.lbp) ||
(!isEndOfExpr() && last.lbp < state.tokens.next.lbp);
}
if (!isNecessary) {
warning("W126", opening);
}
ret.paren = true;
}
return ret;
});
application("=>");
infix("[", function(left, that) {
var e, s, canUseDot;
if (state.option.asi && checkPunctuators(state.tokens.prev, [")", "]"]) &&
state.tokens.prev.line !== startLine(state.tokens.curr)) {
warning("W014", state.tokens.curr, state.tokens.curr.id);
}
e = expression(10);
if (e && e.type === "(string)") {
if (!state.option.evil && (e.value === "eval" || e.value === "execScript")) {
if (isGlobalEval(left, state)) {
warning("W061");
}
}
countMember(e.value);
if (!state.option.sub && reg.identifier.test(e.value)) {
s = state.syntax[e.value];
if (s) {
canUseDot = !isReserved(s);
} else {
// This branch exists to preserve legacy behavior with version 2.9.5
// and earlier. In those releases, `eval` and `arguments` were
// incorrectly interpreted as reserved keywords, so Member
// Expressions such as `object["eval"]` did not trigger warning W069.
//
// TODO: Remove in JSHint 3
canUseDot = e.value !== "eval" && e.value !== "arguments";
}
if (canUseDot) {
warning("W069", state.tokens.prev, e.value);
}
}
}
advance("]", that);
if (e && e.value === "hasOwnProperty" && state.tokens.next.value === "=") {
warning("W001");
}
that.left = left;
that.right = e;
return that;
}, 160, true);
function comprehensiveArrayExpression() {
var res = {};
res.exps = true;
state.funct["(comparray)"].stack();
// Handle reversed for expressions, used in spidermonkey
var reversed = false;
if (state.tokens.next.value !== "for") {
reversed = true;
if (!state.inMoz()) {
warning("W116", state.tokens.next, "for", state.tokens.next.value);
}
state.funct["(comparray)"].setState("use");
res.right = expression(10);
}
advance("for");
if (state.tokens.next.value === "each") {
advance("each");
if (!state.inMoz()) {
warning("W118", state.tokens.curr, "for each");
}
}
advance("(");
state.funct["(comparray)"].setState("define");
res.left = expression(130);
if (_.includes(["in", "of"], state.tokens.next.value)) {
advance();
} else {
error("E045", state.tokens.curr);
}
state.funct["(comparray)"].setState("generate");
expression(10);
advance(")");
if (state.tokens.next.value === "if") {
advance("if");
advance("(");
state.funct["(comparray)"].setState("filter");
expression(10);
advance(")");
}
if (!reversed) {
state.funct["(comparray)"].setState("use");
res.right = expression(10);
}
advance("]");
state.funct["(comparray)"].unstack();
return res;
}
prefix("[", function() {
var blocktype = lookupBlockType();
if (blocktype.isCompArray) {
if (!state.option.esnext && !state.inMoz()) {
warning("W118", state.tokens.curr, "array comprehension");
}
return comprehensiveArrayExpression();
} else if (blocktype.isDestAssign) {
this.destructAssign = destructuringPattern({ openingParsed: true, assignment: true });
return this;
}
var b = state.tokens.curr.line !== startLine(state.tokens.next);
this.first = [];
if (b) {
indent += state.option.indent;
if (state.tokens.next.from === indent + state.option.indent) {
indent += state.option.indent;
}
}
while (state.tokens.next.id !== "(end)") {
while (state.tokens.next.id === ",") {
if (!state.option.elision) {
if (!state.inES5()) {
// Maintain compat with old options --- ES5 mode without
// elision=true will warn once per comma
warning("W070");
} else {
warning("W128");
do {
advance(",");
} while (state.tokens.next.id === ",");
continue;
}
}
advance(",");
}
if (state.tokens.next.id === "]") {
break;
}
this.first.push(expression(10));
if (state.tokens.next.id === ",") {
parseComma({ allowTrailing: true });
if (state.tokens.next.id === "]" && !state.inES5()) {
warning("W070", state.tokens.curr);
break;
}
} else {
if (state.option.trailingcomma && state.inES5()) {
warningAt("W140", state.tokens.curr.line, state.tokens.curr.character);
}
break;
}
}
if (b) {
indent -= state.option.indent;
}
advance("]", this);
return this;
});
function isMethod() {
return state.funct["(statement)"] && state.funct["(statement)"].type === "class" ||
state.funct["(context)"] && state.funct["(context)"]["(verb)"] === "class";
}
function isPropertyName(token) {
return token.identifier || token.id === "(string)" || token.id === "(number)";
}
function propertyName(preserveOrToken) {
var id;
var preserve = true;
if (typeof preserveOrToken === "object") {
id = preserveOrToken;
} else {
preserve = preserveOrToken;
id = optionalidentifier(true, preserve);
}
if (!id) {
if (state.tokens.next.id === "(string)") {
id = state.tokens.next.value;
if (!preserve) {
advance();
}
} else if (state.tokens.next.id === "(number)") {
id = state.tokens.next.value.toString();
if (!preserve) {
advance();
}
}
} else if (typeof id === "object") {
if (id.id === "(string)" || id.id === "(identifier)") id = id.value;
else if (id.id === "(number)") id = id.value.toString();
}
if (id === "hasOwnProperty") {
warning("W001");
}
return id;
}
/**
* @param {Object} [options]
* @param {token} [options.loneArg] The argument to the function in cases
* where it was defined using the
* single-argument shorthand.
* @param {bool} [options.parsedOpening] Whether the opening parenthesis has
* already been parsed.
* @returns {{ arity: number, params: Array.<string>}}
*/
function functionparams(options) {
var next;
var paramsIds = [];
var ident;
var tokens = [];
var t;
var pastDefault = false;
var pastRest = false;
var arity = 0;
var loneArg = options && options.loneArg;
if (loneArg && loneArg.identifier === true) {
state.funct["(scope)"].addParam(loneArg.value, loneArg);
return { arity: 1, params: [ loneArg.value ] };
}
next = state.tokens.next;
if (!options || !options.parsedOpening) {
advance("(");
}
if (state.tokens.next.id === ")") {
advance(")");
return;
}
function addParam(addParamArgs) {
state.funct["(scope)"].addParam.apply(state.funct["(scope)"], addParamArgs);
}
for (;;) {
arity++;
// are added to the param scope
var currentParams = [];
if (_.includes(["{", "["], state.tokens.next.id)) {
tokens = destructuringPattern();
for (t in tokens) {
t = tokens[t];
if (t.id) {
paramsIds.push(t.id);
currentParams.push([t.id, t.token]);
}
}
} else {
if (checkPunctuator(state.tokens.next, "...")) pastRest = true;
ident = identifier();
if (ident) {
paramsIds.push(ident);
currentParams.push([ident, state.tokens.curr]);
} else {
// Skip invalid parameter.
while (!checkPunctuators(state.tokens.next, [",", ")"])) advance();
}
}
// It is valid to have a regular argument after a default argument
// since undefined can be used for missing parameters. Still warn as it is
// a possible code smell.
if (pastDefault) {
if (state.tokens.next.id !== "=") {
error("W138", state.tokens.curr);
}
}
if (state.tokens.next.id === "=") {
if (!state.inES6()) {
warning("W119", state.tokens.next, "default parameters", "6");
}
if (pastRest) {
error("E062", state.tokens.next);
}
advance("=");
pastDefault = true;
expression(10);
}
// now we have evaluated the default expression, add the variable to the param scope
currentParams.forEach(addParam);
if (state.tokens.next.id === ",") {
if (pastRest) {
warning("W131", state.tokens.next);
}
parseComma();
} else {
advance(")", next);
return { arity: arity, params: paramsIds };
}
}
}
function functor(name, token, overwrites) {
var funct = {
"(name)" : name,
"(breakage)" : 0,
"(loopage)" : 0,
// The strictness of the function body is tracked via a dedicated
// property (as opposed to via the global `state` object) so that the
// value can be referenced after the body has been fully parsed (i.e.
// when validating the identifier used in function declarations and
// function expressions).
"(isStrict)" : "unknown",
"(global)" : false,
"(line)" : null,
"(character)" : null,
"(metrics)" : null,
"(statement)" : null,
"(context)" : null,
"(scope)" : null,
"(comparray)" : null,
"(generator)" : null,
"(arrow)" : null,
"(params)" : null
};
if (token) {
_.extend(funct, {
"(line)" : token.line,
"(character)": token.character,
"(metrics)" : createMetrics(token)
});
}
_.extend(funct, overwrites);
if (funct["(context)"]) {
funct["(scope)"] = funct["(context)"]["(scope)"];
funct["(comparray)"] = funct["(context)"]["(comparray)"];
}
return funct;
}
function isFunctor(token) {
return "(scope)" in token;
}
/**
* Determine if the parser has begun parsing executable code.
*
* @param {Token} funct - The current "functor" token
*
* @returns {boolean}
*/
function hasParsedCode(funct) {
return funct["(global)"] && !funct["(verb)"];
}
/**
* This function is used as both a null-denotation method *and* a
* left-denotation method, meaning the first parameter is overloaded.
*/
function doTemplateLiteral(leftOrRbp) {
// ASSERT: this.type === "(template)"
// jshint validthis: true
var ctx = this.context;
var noSubst = this.noSubst;
var depth = this.depth;
var left = typeof leftOrRbp === "number" ? null : leftOrRbp;
if (!noSubst) {
while (!end()) {
if (!state.tokens.next.template || state.tokens.next.depth > depth) {
expression(0); // should probably have different rbp?
} else {
// skip template start / middle
advance();
}
}
}
return {
id: "(template)",
type: "(template)",
tag: left
};
function end() {
if (state.tokens.curr.template && state.tokens.curr.tail &&
state.tokens.curr.context === ctx) return true;
var complete = (state.tokens.next.template && state.tokens.next.tail &&
state.tokens.next.context === ctx);
if (complete) advance();
return complete || state.tokens.next.isUnclosed;
}
}
/**
* @param {Object} [options]
* @param {string} [options.name] The identifier belonging to the function (if
* any)
* @param {token} [options.statement] The statement that triggered creation
* of the current function.
* @param {string} [options.type] If specified, either "generator" or "arrow"
* @param {token} [options.loneArg] The argument to the function in cases
* where it was defined using the
* single-argument shorthand
* @param {bool} [options.parsedOpening] Whether the opening parenthesis has
* already been parsed
* @param {string} [options.classExprBinding] Define a function with this
* identifier in the new function's
* scope, mimicking the bahavior of
* class expression names within
* the body of member functions.
*/
function doFunction(options) {
var f, token, name, statement, classExprBinding, isGenerator, isArrow,
isMethod, ignoreLoopFunc;
var oldOption = state.option;
var oldIgnored = state.ignored;
if (options) {
name = options.name;
statement = options.statement;
classExprBinding = options.classExprBinding;
isGenerator = options.type === "generator";
isArrow = options.type === "arrow";
isMethod = options.isMethod;
ignoreLoopFunc = options.ignoreLoopFunc;
}
state.option = Object.create(state.option);
state.ignored = Object.create(state.ignored);
state.funct = functor(name || state.nameStack.infer(), state.tokens.next, {
"(statement)": statement,
"(context)": state.funct,
"(arrow)": isArrow,
"(method)": isMethod,
"(generator)": isGenerator
});
f = state.funct;
token = state.tokens.curr;
functions.push(state.funct);
// So that the function is available to itself and referencing itself is not
// seen as a closure, add the function name to a new scope, but do not
// test for unused (unused: false)
// it is a new block scope so that params can override it, it can be block scoped
// but declarations inside the function don't cause already declared error
state.funct["(scope)"].stack("functionouter");
var internallyAccessibleName = name || classExprBinding;
if (internallyAccessibleName) {
state.funct["(scope)"].block.add(internallyAccessibleName,
classExprBinding ? "class" : "function", state.tokens.curr, false);
}
if (!isArrow) {
state.funct["(scope)"].funct.add("arguments", "var", token, false);
}
// create the param scope (params added in functionparams)
state.funct["(scope)"].stack("functionparams");
var paramsInfo = functionparams(options);
if (paramsInfo) {
state.funct["(params)"] = paramsInfo.params;
state.funct["(metrics)"].arity = paramsInfo.arity;
state.funct["(metrics)"].verifyMaxParametersPerFunction();
} else {
state.funct["(metrics)"].arity = 0;
}
if (isArrow) {
if (!state.inES6(true)) {
warning("W119", state.tokens.curr, "arrow function syntax (=>)", "6");
}
if (!options.loneArg) {
advance("=>");
}
}
block(false, true, true, isArrow);
if (!state.option.noyield && isGenerator &&
state.funct["(generator)"] !== "yielded") {
warning("W124", state.tokens.curr);
}
state.funct["(metrics)"].verifyMaxStatementsPerFunction();
state.funct["(metrics)"].verifyMaxComplexityPerFunction();
state.funct["(unusedOption)"] = state.option.unused;
state.option = oldOption;
state.ignored = oldIgnored;
state.funct["(last)"] = state.tokens.curr.line;
state.funct["(lastcharacter)"] = state.tokens.curr.character;
// unstack the params scope
state.funct["(scope)"].unstack(); // also does usage and label checks
// unstack the function outer stack
state.funct["(scope)"].unstack();
state.funct = state.funct["(context)"];
if (!ignoreLoopFunc && !state.option.loopfunc && state.funct["(loopage)"]) {
// If the function we just parsed accesses any non-local variables
// trigger a warning. Otherwise, the function is safe even within
// a loop.
if (f["(outerMutables)"]) {
warning("W083", token, f["(outerMutables)"].join(", "));
}
}
return f;
}
function createMetrics(functionStartToken) {
return {
statementCount: 0,
nestedBlockDepth: -1,
ComplexityCount: 1,
arity: 0,
verifyMaxStatementsPerFunction: function() {
if (state.option.maxstatements &&
this.statementCount > state.option.maxstatements) {
warning("W071", functionStartToken, this.statementCount);
}
},
verifyMaxParametersPerFunction: function() {
if (_.isNumber(state.option.maxparams) &&
this.arity > state.option.maxparams) {
warning("W072", functionStartToken, this.arity);
}
},
verifyMaxNestedBlockDepthPerFunction: function() {
if (state.option.maxdepth &&
this.nestedBlockDepth > 0 &&
this.nestedBlockDepth === state.option.maxdepth + 1) {
warning("W073", null, this.nestedBlockDepth);
}
},
verifyMaxComplexityPerFunction: function() {
var max = state.option.maxcomplexity;
var cc = this.ComplexityCount;
if (max && cc > max) {
warning("W074", functionStartToken, cc);
}
}
};
}
function increaseComplexityCount() {
state.funct["(metrics)"].ComplexityCount += 1;
}
// Parse assignments that were found instead of conditionals.
// For example: if (a = 1) { ... }
function checkCondAssignment(expr) {
var id, paren;
if (expr) {
id = expr.id;
paren = expr.paren;
if (id === "," && (expr = expr.exprs[expr.exprs.length - 1])) {
id = expr.id;
paren = paren || expr.paren;
}
}
switch (id) {
case "=":
case "+=":
case "-=":
case "*=":
case "%=":
case "&=":
case "|=":
case "^=":
case "/=":
if (!paren && !state.option.boss) {
warning("W084");
}
}
}
/**
* @param {object} props Collection of property descriptors for a given
* object.
*/
function checkProperties(props) {
// Check for lonely setters if in the ES5 mode.
if (state.inES5()) {
for (var name in props) {
if (props[name] && props[name].setterToken && !props[name].getterToken) {
warning("W078", props[name].setterToken);
}
}
}
}
function metaProperty(name, c) {
if (checkPunctuator(state.tokens.next, ".")) {
var left = state.tokens.curr.id;
advance(".");
var id = identifier();
state.tokens.curr.isMetaProperty = true;
if (name !== id) {
error("E057", state.tokens.prev, left, id);
} else {
c();
}
return state.tokens.curr;
}
}
(function(x) {
x.nud = function() {
var b, f, i, p, t, isGeneratorMethod = false, nextVal;
var props = Object.create(null); // All properties, including accessors
b = state.tokens.curr.line !== startLine(state.tokens.next);
if (b) {
indent += state.option.indent;
if (state.tokens.next.from === indent + state.option.indent) {
indent += state.option.indent;
}
}
var blocktype = lookupBlockType();
if (blocktype.isDestAssign) {
this.destructAssign = destructuringPattern({ openingParsed: true, assignment: true });
return this;
}
for (;;) {
if (state.tokens.next.id === "}") {
break;
}
nextVal = state.tokens.next.value;
if (state.tokens.next.identifier &&
(peekIgnoreEOL().id === "," || peekIgnoreEOL().id === "}")) {
if (!state.inES6()) {
warning("W104", state.tokens.next, "object short notation", "6");
}
i = propertyName(true);
saveProperty(props, i, state.tokens.next);
expression(10);
} else if (peek().id !== ":" && (nextVal === "get" || nextVal === "set")) {
advance(nextVal);
if (!state.inES5()) {
error("E034");
}
if (state.tokens.next.id === "[") {
i = computedPropertyName();
} else {
i = propertyName();
// ES6 allows for get() {...} and set() {...} method
// definition shorthand syntax, so we don't produce an error
// if linting ECMAScript 6 code.
if (!i && !state.inES6()) {
error("E035");
}
}
// We don't want to save this getter unless it's an actual getter
// and not an ES6 concise method
if (i) {
saveAccessor(nextVal, props, i, state.tokens.curr);
}
t = state.tokens.next;
f = doFunction({ isMethod: true });
p = f["(params)"];
// Don't warn about getter/setter pairs if this is an ES6 concise method
if (nextVal === "get" && i && p) {
warning("W076", t, p[0], i);
} else if (nextVal === "set" && i && f["(metrics)"].arity !== 1) {
warning("W077", t, i);
}
} else {
if (state.tokens.next.value === "*" && state.tokens.next.type === "(punctuator)") {
if (!state.inES6()) {
warning("W104", state.tokens.next, "generator functions", "6");
}
advance("*");
isGeneratorMethod = true;
} else {
isGeneratorMethod = false;
}
if (state.tokens.next.id === "[") {
i = computedPropertyName();
state.nameStack.set(i);
} else {
state.nameStack.set(state.tokens.next);
i = propertyName();
saveProperty(props, i, state.tokens.next);
if (typeof i !== "string") {
break;
}
}
if (state.tokens.next.value === "(") {
if (!state.inES6()) {
warning("W104", state.tokens.curr, "concise methods", "6");
}
doFunction({
isMethod: true,
type: isGeneratorMethod ? "generator" : null
});
} else {
advance(":");
expression(10);
}
}
countMember(i);
if (state.tokens.next.id === ",") {
parseComma({ allowTrailing: true, property: true });
if (state.tokens.next.id === ",") {
warning("W070", state.tokens.curr);
} else if (state.tokens.next.id === "}" && !state.inES5()) {
warning("W070", state.tokens.curr);
}
} else {
if (state.option.trailingcomma && state.inES5()) {
warningAt("W140", state.tokens.curr.line, state.tokens.curr.character);
}
break;
}
}
if (b) {
indent -= state.option.indent;
}
advance("}", this);
checkProperties(props);
return this;
};
x.fud = function() {
error("E036", state.tokens.curr);
};
}(delim("{")));
function destructuringPattern(options) {
var isAssignment = options && options.assignment;
if (!state.inES6()) {
warning("W104", state.tokens.curr,
isAssignment ? "destructuring assignment" : "destructuring binding", "6");
}
return destructuringPatternRecursive(options);
}
function destructuringPatternRecursive(options) {
var ids, idx;
var identifiers = [];
var openingParsed = options && options.openingParsed;
var isAssignment = options && options.assignment;
var recursiveOptions = isAssignment ? { assignment: isAssignment } : null;
var firstToken = openingParsed ? state.tokens.curr : state.tokens.next;
var nextInnerDE = function() {
var ident;
if (checkPunctuators(state.tokens.next, ["[", "{"])) {
ids = destructuringPatternRecursive(recursiveOptions);
for (idx = 0; idx < ids.length; idx++) {
identifiers.push({ id: ids[idx].id, token: ids[idx].token });
}
} else if (checkPunctuator(state.tokens.next, ",")) {
identifiers.push({ id: null, token: state.tokens.curr });
} else if (checkPunctuator(state.tokens.next, "(")) {
advance("(");
nextInnerDE();
advance(")");
} else {
var is_rest = checkPunctuator(state.tokens.next, "...");
if (isAssignment) {
var assignTarget = expression(20);
if (assignTarget) {
checkLeftSideAssign(assignTarget);
// if the target was a simple identifier, add it to the list to return
if (assignTarget.identifier) {
ident = assignTarget.value;
}
}
} else {
ident = identifier();
}
if (ident) {
identifiers.push({ id: ident, token: state.tokens.curr });
}
return is_rest;
}
return false;
};
var assignmentProperty = function() {
var id;
if (checkPunctuator(state.tokens.next, "[")) {
advance("[");
expression(10);
advance("]");
advance(":");
nextInnerDE();
} else if (state.tokens.next.id === "(string)" ||
state.tokens.next.id === "(number)") {
advance();
advance(":");
nextInnerDE();
} else {
// this id will either be the property name or the property name and the assigning identifier
id = identifier();
if (checkPunctuator(state.tokens.next, ":")) {
advance(":");
nextInnerDE();
} else if (id) {
// in this case we are assigning (not declaring), so check assignment
if (isAssignment) {
checkLeftSideAssign(state.tokens.curr);
}
identifiers.push({ id: id, token: state.tokens.curr });
}
}
};
var id, value;
if (checkPunctuator(firstToken, "[")) {
if (!openingParsed) {
advance("[");
}
if (checkPunctuator(state.tokens.next, "]")) {
warning("W137", state.tokens.curr);
}
var element_after_rest = false;
while (!checkPunctuator(state.tokens.next, "]")) {
if (nextInnerDE() && !element_after_rest &&
checkPunctuator(state.tokens.next, ",")) {
warning("W130", state.tokens.next);
element_after_rest = true;
}
if (checkPunctuator(state.tokens.next, "=")) {
if (checkPunctuator(state.tokens.prev, "...")) {
advance("]");
} else {
advance("=");
}
id = state.tokens.prev;
value = expression(10);
if (value && value.identifier && value.value === "undefined") {
warning("W080", id, id.value);
}
}
if (!checkPunctuator(state.tokens.next, "]")) {
advance(",");
}
}
advance("]");
} else if (checkPunctuator(firstToken, "{")) {
if (!openingParsed) {
advance("{");
}
if (checkPunctuator(state.tokens.next, "}")) {
warning("W137", state.tokens.curr);
}
while (!checkPunctuator(state.tokens.next, "}")) {
assignmentProperty();
if (checkPunctuator(state.tokens.next, "=")) {
advance("=");
id = state.tokens.prev;
value = expression(10);
if (value && value.identifier && value.value === "undefined") {
warning("W080", id, id.value);
}
}
if (!checkPunctuator(state.tokens.next, "}")) {
advance(",");
if (checkPunctuator(state.tokens.next, "}")) {
// Trailing comma
// ObjectBindingPattern: { BindingPropertyList , }
break;
}
}
}
advance("}");
}
return identifiers;
}
function destructuringPatternMatch(tokens, value) {
var first = value.first;
if (!first)
return;
_.zip(tokens, Array.isArray(first) ? first : [ first ]).forEach(function(val) {
var token = val[0];
var value = val[1];
if (token && value)
token.first = value;
else if (token && token.first && !value)
warning("W080", token.first, token.first.value);
});
}
function blockVariableStatement(type, statement, context) {
// used for both let and const statements
var prefix = context && context.prefix;
var inexport = context && context.inexport;
var isLet = type === "let";
var isConst = type === "const";
var tokens, lone, value, letblock;
if (!state.inES6()) {
warning("W104", state.tokens.curr, type, "6");
}
if (isLet && state.tokens.next.value === "(") {
if (!state.inMoz()) {
warning("W118", state.tokens.next, "let block");
}
advance("(");
state.funct["(scope)"].stack();
letblock = true;
} else if (state.funct["(noblockscopedvar)"]) {
error("E048", state.tokens.curr, isConst ? "Const" : "Let");
}
statement.first = [];
for (;;) {
var names = [];
if (_.includes(["{", "["], state.tokens.next.value)) {
tokens = destructuringPattern();
lone = false;
} else {
tokens = [ { id: identifier(), token: state.tokens.curr } ];
lone = true;
}
if (!prefix && isConst && state.tokens.next.id !== "=") {
warning("E012", state.tokens.curr, state.tokens.curr.value);
}
for (var t in tokens) {
if (tokens.hasOwnProperty(t)) {
t = tokens[t];
if (state.funct["(scope)"].block.isGlobal()) {
if (predefined[t.id] === false) {
warning("W079", t.token, t.id);
}
}
if (t.id && !state.funct["(noblockscopedvar)"]) {
state.funct["(scope)"].addlabel(t.id, {
type: type,
token: t.token });
names.push(t.token);
}
}
}
if (state.tokens.next.id === "=") {
advance("=");
if (!prefix && peek(0).id === "=" && state.tokens.next.identifier) {
warning("W120", state.tokens.next, state.tokens.next.value);
}
var id = state.tokens.prev;
// don't accept `in` in expression if prefix is used for ForIn/Of loop.
value = expression(prefix ? 120 : 10);
if (!prefix && value && value.identifier && value.value === "undefined") {
warning("W080", id, id.value);
}
if (!lone) {
destructuringPatternMatch(names, value);
}
}
if (!prefix) {
for (t in tokens) {
if (tokens.hasOwnProperty(t)) {
t = tokens[t];
state.funct["(scope)"].initialize(t.id);
if (lone && inexport) {
state.funct["(scope)"].setExported(t.token.value, t.token);
}
}
}
}
statement.first = statement.first.concat(names);
if (state.tokens.next.id !== ",") {
break;
}
parseComma();
}
if (letblock) {
advance(")");
block(true, true);
statement.block = true;
state.funct["(scope)"].unstack();
}
return statement;
}
var conststatement = stmt("const", function(context) {
return blockVariableStatement("const", this, context);
});
conststatement.exps = true;
var letstatement = stmt("let", function(context) {
return blockVariableStatement("let", this, context);
});
letstatement.exps = true;
var varstatement = stmt("var", function(context) {
var prefix = context && context.prefix;
var inexport = context && context.inexport;
var tokens, lone, value, id;
this.first = [];
for (;;) {
var names = [];
if (_.includes(["{", "["], state.tokens.next.value)) {
tokens = destructuringPattern();
lone = false;
} else {
tokens = [];
id = identifier();
if (id) {
tokens.push({ id: id, token: state.tokens.curr });
}
lone = true;
}
if (state.option.varstmt) {
warning("W132", this);
}
this.first = this.first.concat(names);
for (var t in tokens) {
if (tokens.hasOwnProperty(t)) {
t = tokens[t];
if (state.funct["(global)"] && !state.impliedClosure()) {
if (predefined[t.id] === false) {
warning("W079", t.token, t.id);
} else if (state.option.futurehostile === false) {
if ((!state.inES5() && vars.ecmaIdentifiers[5][t.id] === false) ||
(!state.inES6() && vars.ecmaIdentifiers[6][t.id] === false)) {
warning("W129", t.token, t.id);
}
}
}
if (t.id) {
state.funct["(scope)"].addlabel(t.id, {
type: "var",
token: t.token });
if (lone && inexport) {
state.funct["(scope)"].setExported(t.id, t.token);
}
names.push(t.token);
}
}
}
if (state.tokens.next.id === "=") {
state.nameStack.set(state.tokens.curr);
advance("=");
if (peek(0).id === "=" && state.tokens.next.identifier) {
if (!prefix &&
!state.funct["(params)"] ||
state.funct["(params)"].indexOf(state.tokens.next.value) === -1) {
warning("W120", state.tokens.next, state.tokens.next.value);
}
}
id = state.tokens.prev;
// don't accept `in` in expression if prefix is used for ForIn/Of loop.
value = expression(prefix ? 120 : 10);
if (value && !prefix && !state.funct["(loopage)"] &&
value.identifier && value.value === "undefined") {
warning("W080", id, id.value);
}
if (!lone) {
destructuringPatternMatch(names, value);
}
}
if (state.tokens.next.id !== ",") {
break;
}
parseComma();
}
return this;
});
varstatement.exps = true;
blockstmt("class", function(rbp) {
return classdef.call(this, rbp, true);
});
function classdef(rbp, isStatement) {
/*jshint validthis:true */
var wasInClassBody = state.inClassBody;
state.inClassBody = true;
if (!state.inES6()) {
warning("W104", state.tokens.curr, "class", "6");
}
if (isStatement) {
// BindingIdentifier
this.name = identifier();
state.funct["(scope)"].addlabel(this.name, {
type: "class",
token: state.tokens.curr });
} else if (state.tokens.next.identifier && state.tokens.next.value !== "extends") {
// BindingIdentifier(opt)
this.name = identifier();
this.namedExpr = true;
} else {
this.name = state.nameStack.infer();
}
classtail(this);
state.inClassBody = wasInClassBody;
if (isStatement) {
state.funct["(scope)"].initialize(this.name);
}
return this;
}
function classtail(c) {
// ClassHeritage(opt)
if (state.tokens.next.value === "extends") {
advance("extends");
expression(10);
}
advance("{");
// ClassBody(opt)
classbody(c);
advance("}");
}
function classbody(c) {
var name;
var isStatic;
var isGenerator;
var getset;
var props = Object.create(null);
var staticProps = Object.create(null);
var computed;
while (state.tokens.next.id !== "}") {
name = state.tokens.next;
isStatic = false;
isGenerator = false;
getset = null;
// The ES6 grammar for ClassElement includes the `;` token, but it is
// defined only as a placeholder to facilitate future language
// extensions. In ES6 code, it serves no purpose.
if (name.id === ";") {
warning("W032");
advance(";");
continue;
}
if (name.id === "*") {
isGenerator = true;
advance("*");
name = state.tokens.next;
}
if (name.id === "[") {
name = computedPropertyName();
computed = true;
} else if (isPropertyName(name)) {
// Non-Computed PropertyName
advance();
computed = false;
if (name.identifier && name.value === "static") {
if (checkPunctuator(state.tokens.next, "*")) {
isGenerator = true;
advance("*");
}
if (isPropertyName(state.tokens.next) || state.tokens.next.id === "[") {
computed = state.tokens.next.id === "[";
isStatic = true;
name = state.tokens.next;
if (state.tokens.next.id === "[") {
name = computedPropertyName();
} else advance();
}
}
if (name.identifier && (name.value === "get" || name.value === "set")) {
if (isPropertyName(state.tokens.next) || state.tokens.next.id === "[") {
computed = state.tokens.next.id === "[";
getset = name;
name = state.tokens.next;
if (state.tokens.next.id === "[") {
name = computedPropertyName();
} else advance();
}
}
} else {
warning("W052", state.tokens.next, state.tokens.next.value || state.tokens.next.type);
advance();
continue;
}
if (!checkPunctuator(state.tokens.next, "(")) {
// error --- class properties must be methods
error("E054", state.tokens.next, state.tokens.next.value);
while (state.tokens.next.id !== "}" &&
!checkPunctuator(state.tokens.next, "(")) {
advance();
}
if (state.tokens.next.value !== "(") {
doFunction({
isMethod: true,
statement: c
});
}
}
if (!computed) {
// We don't know how to determine if we have duplicate computed property names :(
if (getset) {
saveAccessor(
getset.value, isStatic ? staticProps : props, name.value, name, true, isStatic);
} else {
if (name.value === "constructor") {
state.nameStack.set(c);
} else {
state.nameStack.set(name);
}
saveProperty(isStatic ? staticProps : props, name.value, name, true, isStatic);
}
}
if (getset && name.value === "constructor") {
var propDesc = getset.value === "get" ? "class getter method" : "class setter method";
error("E049", name, propDesc, "constructor");
} else if (name.value === "prototype") {
error("E049", name, "class method", "prototype");
}
propertyName(name);
doFunction({
statement: c,
isMethod: true,
type: isGenerator ? "generator" : null,
classExprBinding: c.namedExpr ? c.name : null
});
}
checkProperties(props);
}
blockstmt("function", function(context) {
var inexport = context && context.inexport;
var generator = false;
if (state.tokens.next.value === "*") {
advance("*");
if (state.inES6(true)) {
generator = true;
} else {
warning("W119", state.tokens.curr, "function*", "6");
}
}
if (inblock) {
warning("W082", state.tokens.curr);
}
var nameToken = optionalidentifier() ? state.tokens.curr : null;
if (!nameToken) {
warning("W025");
} else {
state.funct["(scope)"].addlabel(nameToken.value, {
type: generator ? "generator function" : "function",
token: state.tokens.curr,
initialized: true });
if (inexport) {
state.funct["(scope)"].setExported(nameToken.value, state.tokens.prev);
}
}
var f = doFunction({
name: nameToken && nameToken.value,
statement: this,
type: generator ? "generator" : null,
ignoreLoopFunc: inblock // a declaration may already have warned
});
// If the function declaration is strict because the surrounding code is
// strict, the invalid name will trigger E008 when the scope manager
// attempts to create a binding in the strict environment record. An error
// should only be signaled here when the function itself enables strict
// mode (the scope manager will not report an error because a declaration
// does not introduce a binding into the function's environment record).
var enablesStrictMode = f["(isStrict)"] && !state.isStrict();
if (nameToken && (f["(name)"] === "arguments" || f["(name)"] === "eval") &&
enablesStrictMode) {
error("E008", nameToken);
}
if (state.tokens.next.id === "(" && state.tokens.next.line === state.tokens.curr.line) {
error("E039");
}
return this;
});
prefix("function", function() {
var generator = false;
if (state.tokens.next.value === "*") {
if (!state.inES6()) {
warning("W119", state.tokens.curr, "function*", "6");
}
advance("*");
generator = true;
}
var nameToken = optionalidentifier() ? state.tokens.curr : null;
var f = doFunction({
name: nameToken && nameToken.value,
type: generator ? "generator" : null
});
if (nameToken && (f["(name)"] === "arguments" || f["(name)"] === "eval") &&
f["(isStrict)"]) {
error("E008", nameToken);
}
return this;
});
blockstmt("if", function() {
var t = state.tokens.next;
increaseComplexityCount();
state.condition = true;
advance("(");
var expr = expression(0);
if (!expr) {
quit("E041", this);
}
checkCondAssignment(expr);
// When the if is within a for-in loop, check if the condition
// starts with a negation operator
var forinifcheck = null;
if (state.option.forin && state.forinifcheckneeded) {
state.forinifcheckneeded = false; // We only need to analyze the first if inside the loop
forinifcheck = state.forinifchecks[state.forinifchecks.length - 1];
if (expr.type === "(punctuator)" && expr.value === "!") {
forinifcheck.type = "(negative)";
} else {
forinifcheck.type = "(positive)";
}
}
advance(")", t);
state.condition = false;
var s = block(true, true);
// When the if is within a for-in loop and the condition has a negative form,
// check if the body contains nothing but a continue statement
if (forinifcheck && forinifcheck.type === "(negative)") {
if (s && s[0] && s[0].type === "(identifier)" && s[0].value === "continue") {
forinifcheck.type = "(negative-with-continue)";
}
}
if (state.tokens.next.id === "else") {
advance("else");
if (state.tokens.next.id === "if" || state.tokens.next.id === "switch") {
statement();
} else {
block(true, true);
}
}
return this;
});
blockstmt("try", function() {
var b;
function doCatch() {
advance("catch");
advance("(");
state.funct["(scope)"].stack("catchparams");
if (checkPunctuators(state.tokens.next, ["[", "{"])) {
var tokens = destructuringPattern();
_.each(tokens, function(token) {
if (token.id) {
state.funct["(scope)"].addParam(token.id, token, "exception");
}
});
} else if (state.tokens.next.type !== "(identifier)") {
warning("E030", state.tokens.next, state.tokens.next.value);
} else {
// only advance if we have an identifier so we can continue parsing in the most common error - that no param is given.
state.funct["(scope)"].addParam(identifier(), state.tokens.curr, "exception");
}
if (state.tokens.next.value === "if") {
if (!state.inMoz()) {
warning("W118", state.tokens.curr, "catch filter");
}
advance("if");
expression(0);
}
advance(")");
block(false);
state.funct["(scope)"].unstack();
}
block(true);
while (state.tokens.next.id === "catch") {
increaseComplexityCount();
if (b && (!state.inMoz())) {
warning("W118", state.tokens.next, "multiple catch blocks");
}
doCatch();
b = true;
}
if (state.tokens.next.id === "finally") {
advance("finally");
block(true);
return;
}
if (!b) {
error("E021", state.tokens.next, "catch", state.tokens.next.value);
}
return this;
});
blockstmt("while", function() {
var t = state.tokens.next;
state.funct["(breakage)"] += 1;
state.funct["(loopage)"] += 1;
increaseComplexityCount();
advance("(");
checkCondAssignment(expression(0));
advance(")", t);
block(true, true);
state.funct["(breakage)"] -= 1;
state.funct["(loopage)"] -= 1;
return this;
}).labelled = true;
blockstmt("with", function() {
var t = state.tokens.next;
if (state.isStrict()) {
error("E010", state.tokens.curr);
} else if (!state.option.withstmt) {
warning("W085", state.tokens.curr);
}
advance("(");
expression(0);
advance(")", t);
block(true, true);
return this;
});
blockstmt("switch", function() {
var t = state.tokens.next;
var g = false;
var noindent = false;
state.funct["(breakage)"] += 1;
advance("(");
checkCondAssignment(expression(0));
advance(")", t);
t = state.tokens.next;
advance("{");
state.funct["(scope)"].stack();
if (state.tokens.next.from === indent)
noindent = true;
if (!noindent)
indent += state.option.indent;
this.cases = [];
for (;;) {
switch (state.tokens.next.id) {
case "case":
switch (state.funct["(verb)"]) {
case "yield":
case "break":
case "case":
case "continue":
case "return":
case "switch":
case "throw":
break;
default:
// You can tell JSHint that you don't use break intentionally by
// adding a comment /* falls through */ on a line just before
// the next `case`.
if (!state.tokens.curr.caseFallsThrough) {
warning("W086", state.tokens.curr, "case");
}
}
advance("case");
this.cases.push(expression(0));
increaseComplexityCount();
g = true;
advance(":");
state.funct["(verb)"] = "case";
break;
case "default":
switch (state.funct["(verb)"]) {
case "yield":
case "break":
case "continue":
case "return":
case "throw":
break;
default:
// Do not display a warning if 'default' is the first statement or if
// there is a special /* falls through */ comment.
if (this.cases.length) {
if (!state.tokens.curr.caseFallsThrough) {
warning("W086", state.tokens.curr, "default");
}
}
}
advance("default");
g = true;
advance(":");
break;
case "}":
if (!noindent)
indent -= state.option.indent;
advance("}", t);
state.funct["(scope)"].unstack();
state.funct["(breakage)"] -= 1;
state.funct["(verb)"] = undefined;
return;
case "(end)":
error("E023", state.tokens.next, "}");
return;
default:
indent += state.option.indent;
if (g) {
switch (state.tokens.curr.id) {
case ",":
error("E040");
return;
case ":":
g = false;
statements();
break;
default:
error("E025", state.tokens.curr);
return;
}
} else {
if (state.tokens.curr.id === ":") {
advance(":");
error("E024", state.tokens.curr, ":");
statements();
} else {
error("E021", state.tokens.next, "case", state.tokens.next.value);
return;
}
}
indent -= state.option.indent;
}
}
}).labelled = true;
stmt("debugger", function() {
if (!state.option.debug) {
warning("W087", this);
}
return this;
}).exps = true;
(function() {
var x = stmt("do", function() {
state.funct["(breakage)"] += 1;
state.funct["(loopage)"] += 1;
increaseComplexityCount();
this.first = block(true, true);
advance("while");
var t = state.tokens.next;
advance("(");
checkCondAssignment(expression(0));
advance(")", t);
state.funct["(breakage)"] -= 1;
state.funct["(loopage)"] -= 1;
return this;
});
x.labelled = true;
x.exps = true;
}());
blockstmt("for", function() {
var s, t = state.tokens.next;
var letscope = false;
var foreachtok = null;
if (t.value === "each") {
foreachtok = t;
advance("each");
if (!state.inMoz()) {
warning("W118", state.tokens.curr, "for each");
}
}
increaseComplexityCount();
advance("(");
// what kind of for(…) statement it is? for(…of…)? for(…in…)? for(…;…;…)?
var nextop; // contains the token of the "in" or "of" operator
var i = 0;
var inof = ["in", "of"];
var level = 0; // BindingPattern "level" --- level 0 === no BindingPattern
var comma; // First comma punctuator at level 0
var initializer; // First initializer at level 0
var bindingPower;
var targets;
var target;
// If initial token is a BindingPattern, count it as such.
if (checkPunctuators(state.tokens.next, ["{", "["])) ++level;
do {
nextop = peek(i);
++i;
if (checkPunctuators(nextop, ["{", "["])) ++level;
else if (checkPunctuators(nextop, ["}", "]"])) --level;
if (level < 0) break;
if (level === 0) {
if (!comma && checkPunctuator(nextop, ",")) comma = nextop;
else if (!initializer && checkPunctuator(nextop, "=")) initializer = nextop;
}
} while (
(level > 0 || !_.includes(inof, nextop.value) && nextop.value !== ";") &&
nextop.type !== "(end)");
// if we're in a for (… in|of …) statement
if (_.includes(inof, nextop.value)) {
if (nextop.value === "of") {
bindingPower = 20;
if (!state.inES6()) {
warning("W104", nextop, "for of", "6");
}
} else {
bindingPower = 0;
}
if (initializer) {
error("W133", comma, nextop.value, "initializer is forbidden");
}
if (comma) {
error("W133", comma, nextop.value, "more than one ForBinding");
}
if (state.tokens.next.id === "var") {
advance("var");
state.tokens.curr.fud({ prefix: true });
} else if (state.tokens.next.id === "let" || state.tokens.next.id === "const") {
advance(state.tokens.next.id);
// create a new block scope
letscope = true;
state.funct["(scope)"].stack();
state.tokens.curr.fud({ prefix: true });
} else {
targets = [];
// The following parsing logic recognizes initializers and the comma
// operator despite the fact that they are not supported by the
// grammar. Doing so allows JSHint to emit more a meaningful error
// message (i.e. W133) in response to a common programming mistake.
do {
if (checkPunctuators(state.tokens.next, ["{", "["])) {
destructuringPattern({ assignment: true }).forEach(function(elem) {
this.push(elem.token);
}, targets);
} else {
target = expression(120);
if (target.type === "(identifier)") {
targets.push(target);
}
checkLeftSideAssign(target, nextop);
}
if (checkPunctuator(state.tokens.next, "=")) {
advance("=");
expression(120);
}
if (checkPunctuator(state.tokens.next, ",")) {
advance(",");
}
} while (state.tokens.next !== nextop);
// In the event of a syntax error, do no issue warnings regarding the
// implicit creation of bindings.
if (!initializer && !comma) {
targets.forEach(function(token) {
if (!state.funct["(scope)"].has(token.value)) {
warning("W088", token, token.value);
}
});
}
}
advance(nextop.value);
// The binding power is variable because for-in statements accept any
// Expression in this position, while for-of statements are limited to
// AssignmentExpressions. For example:
//
// for ( LeftHandSideExpression in Expression ) Statement
// for ( LeftHandSideExpression of AssignmentExpression ) Statement
expression(bindingPower);
advance(")", t);
if (nextop.value === "in" && state.option.forin) {
state.forinifcheckneeded = true;
if (state.forinifchecks === undefined) {
state.forinifchecks = [];
}
// Push a new for-in-if check onto the stack. The type will be modified
// when the loop's body is parsed and a suitable if statement exists.
state.forinifchecks.push({
type: "(none)"
});
}
state.funct["(breakage)"] += 1;
state.funct["(loopage)"] += 1;
s = block(true, true);
if (nextop.value === "in" && state.option.forin) {
if (state.forinifchecks && state.forinifchecks.length > 0) {
var check = state.forinifchecks.pop();
if (// No if statement or not the first statement in loop body
s && s.length > 0 && (typeof s[0] !== "object" || s[0].value !== "if") ||
// Positive if statement is not the only one in loop body
check.type === "(positive)" && s.length > 1 ||
// Negative if statement but no continue
check.type === "(negative)") {
warning("W089", this);
}
}
// Reset the flag in case no if statement was contained in the loop body
state.forinifcheckneeded = false;
}
state.funct["(breakage)"] -= 1;
state.funct["(loopage)"] -= 1;
} else {
if (foreachtok) {
error("E045", foreachtok);
}
if (state.tokens.next.id !== ";") {
if (state.tokens.next.id === "var") {
advance("var");
state.tokens.curr.fud();
} else if (state.tokens.next.id === "let") {
advance("let");
// create a new block scope
letscope = true;
state.funct["(scope)"].stack();
state.tokens.curr.fud();
} else {
for (;;) {
expression(0, "for");
if (state.tokens.next.id !== ",") {
break;
}
parseComma();
}
}
}
nolinebreak(state.tokens.curr);
advance(";");
// start loopage after the first ; as the next two expressions are executed
// on every loop
state.funct["(loopage)"] += 1;
if (state.tokens.next.id !== ";") {
checkCondAssignment(expression(0));
}
nolinebreak(state.tokens.curr);
advance(";");
if (state.tokens.next.id === ";") {
error("E021", state.tokens.next, ")", ";");
}
if (state.tokens.next.id !== ")") {
for (;;) {
expression(0, "for");
if (state.tokens.next.id !== ",") {
break;
}
parseComma();
}
}
advance(")", t);
state.funct["(breakage)"] += 1;
block(true, true);
state.funct["(breakage)"] -= 1;
state.funct["(loopage)"] -= 1;
}
// unstack loop blockscope
if (letscope) {
state.funct["(scope)"].unstack();
}
return this;
}).labelled = true;
stmt("break", function() {
var v = state.tokens.next.value;
if (!state.option.asi)
nolinebreak(this);
if (state.tokens.next.id !== ";" && !state.tokens.next.reach &&
state.tokens.curr.line === startLine(state.tokens.next)) {
if (!state.funct["(scope)"].funct.hasBreakLabel(v)) {
warning("W090", state.tokens.next, v);
}
this.first = state.tokens.next;
advance();
} else {
if (state.funct["(breakage)"] === 0)
warning("W052", state.tokens.next, this.value);
}
reachable(this);
return this;
}).exps = true;
stmt("continue", function() {
var v = state.tokens.next.value;
if (state.funct["(breakage)"] === 0 || !state.funct["(loopage)"]) {
warning("W052", state.tokens.next, this.value);
}
if (!state.option.asi)
nolinebreak(this);
if (state.tokens.next.id !== ";" && !state.tokens.next.reach) {
if (state.tokens.curr.line === startLine(state.tokens.next)) {
if (!state.funct["(scope)"].funct.hasBreakLabel(v)) {
warning("W090", state.tokens.next, v);
}
this.first = state.tokens.next;
advance();
}
}
reachable(this);
return this;
}).exps = true;
stmt("return", function() {
if (this.line === startLine(state.tokens.next)) {
if (state.tokens.next.id !== ";" && !state.tokens.next.reach) {
this.first = expression(0);
if (this.first &&
this.first.type === "(punctuator)" && this.first.value === "=" &&
!this.first.paren && !state.option.boss) {
warningAt("W093", this.first.line, this.first.character);
}
}
} else {
if (state.tokens.next.type === "(punctuator)" &&
["[", "{", "+", "-"].indexOf(state.tokens.next.value) > -1) {
nolinebreak(this); // always warn (Line breaking error)
}
}
reachable(this);
return this;
}).exps = true;
(function(x) {
x.exps = true;
x.lbp = 25;
x.ltBoundary = "after";
}(prefix("yield", function() {
if (state.inMoz()) {
return mozYield.call(this);
}
var prev = state.tokens.prev;
if (!this.beginsStmt && prev.lbp > 30 && !checkPunctuators(prev, ["("])) {
error("E061", this);
}
if (state.inES6(true) && !state.funct["(generator)"]) {
// If it's a yield within a catch clause inside a generator then that's ok
if (!("(catch)" === state.funct["(name)"] && state.funct["(context)"]["(generator)"])) {
error("E046", state.tokens.curr, "yield");
}
} else if (!state.inES6()) {
warning("W104", state.tokens.curr, "yield", "6");
}
state.funct["(generator)"] = "yielded";
if (state.tokens.next.value === "*") {
advance("*");
}
// Parse operand
if (!isEndOfExpr() && state.tokens.next.id !== ",") {
if (state.tokens.next.nud) {
nobreaknonadjacent(state.tokens.curr, state.tokens.next);
this.first = expression(10);
if (this.first.type === "(punctuator)" && this.first.value === "=" &&
!this.first.paren && !state.option.boss) {
warningAt("W093", this.first.line, this.first.character);
}
} else if (state.tokens.next.led) {
if (state.tokens.next.id !== ",") {
error("W017", state.tokens.next);
}
}
}
return this;
})));
/**
* Parsing logic for non-standard Mozilla implementation of `yield`
* expressions.
*/
var mozYield = function() {
var prev = state.tokens.prev;
if (state.inES6(true) && !state.funct["(generator)"]) {
// If it's a yield within a catch clause inside a generator then that's ok
if (!("(catch)" === state.funct["(name)"] && state.funct["(context)"]["(generator)"])) {
error("E046", state.tokens.curr, "yield");
}
}
state.funct["(generator)"] = "yielded";
var delegatingYield = false;
if (state.tokens.next.value === "*") {
delegatingYield = true;
advance("*");
}
if (this.line === startLine(state.tokens.next)) {
if (delegatingYield ||
(state.tokens.next.id !== ";" && !state.option.asi &&
!state.tokens.next.reach && state.tokens.next.nud)) {
nobreaknonadjacent(state.tokens.curr, state.tokens.next);
this.first = expression(10);
if (this.first.type === "(punctuator)" && this.first.value === "=" &&
!this.first.paren && !state.option.boss) {
warningAt("W093", this.first.line, this.first.character);
}
}
if (state.tokens.next.id !== ")" &&
(prev.lbp > 30 || (!prev.assign && !isEndOfExpr()) || prev.id === "yield")) {
error("E050", this);
}
} else if (!state.option.asi) {
nolinebreak(this); // always warn (Line breaking error)
}
return this;
};
stmt("throw", function() {
nolinebreak(this);
this.first = expression(20);
reachable(this);
return this;
}).exps = true;
stmt("import", function() {
if (!state.funct["(scope)"].block.isGlobal()) {
error("E053", state.tokens.curr, "Import");
}
if (!state.inES6()) {
warning("W119", state.tokens.curr, "import", "6");
}
if (state.tokens.next.type === "(string)") {
// ModuleSpecifier :: StringLiteral
advance("(string)");
return this;
}
if (state.tokens.next.identifier) {
// ImportClause :: ImportedDefaultBinding
this.name = identifier();
// Import bindings are immutable (see ES6 8.1.1.5.5)
state.funct["(scope)"].addlabel(this.name, {
type: "import",
initialized: true,
token: state.tokens.curr });
if (state.tokens.next.value === ",") {
// ImportClause :: ImportedDefaultBinding , NameSpaceImport
// ImportClause :: ImportedDefaultBinding , NamedImports
advance(",");
// At this point, we intentionally fall through to continue matching
// either NameSpaceImport or NamedImports.
// Discussion:
// https://github.com/jshint/jshint/pull/2144#discussion_r23978406
} else {
advance("from");
advance("(string)");
return this;
}
}
if (state.tokens.next.id === "*") {
// ImportClause :: NameSpaceImport
advance("*");
advance("as");
if (state.tokens.next.identifier) {
this.name = identifier();
// Import bindings are immutable (see ES6 8.1.1.5.5)
state.funct["(scope)"].addlabel(this.name, {
type: "import",
initialized: true,
token: state.tokens.curr });
}
} else {
// ImportClause :: NamedImports
advance("{");
for (;;) {
if (state.tokens.next.value === "}") {
advance("}");
break;
}
var importName;
if (state.tokens.next.type === "default") {
importName = "default";
advance("default");
} else {
importName = identifier();
}
if (state.tokens.next.value === "as") {
advance("as");
importName = identifier();
}
// Import bindings are immutable (see ES6 8.1.1.5.5)
state.funct["(scope)"].addlabel(importName, {
type: "import",
initialized: true,
token: state.tokens.curr });
if (state.tokens.next.value === ",") {
advance(",");
} else if (state.tokens.next.value === "}") {
advance("}");
break;
} else {
error("E024", state.tokens.next, state.tokens.next.value);
break;
}
}
}
// FromClause
advance("from");
advance("(string)");
// Support for ES2015 modules was released without warning for `import`
// declarations that lack bindings. Issuing a warning would therefor
// constitute a breaking change.
// TODO: enable this warning in JSHint 3
// if (hasBindings) {
// warning("W142", this, "import", moduleSpecifier);
// }
return this;
}).exps = true;
stmt("export", function() {
var ok = true;
var token;
var identifier;
var moduleSpecifier;
if (!state.inES6()) {
warning("W119", state.tokens.curr, "export", "6");
ok = false;
}
if (!state.funct["(scope)"].block.isGlobal()) {
error("E053", state.tokens.curr, "Export");
ok = false;
}
if (state.tokens.next.value === "*") {
// ExportDeclaration :: export * FromClause
advance("*");
advance("from");
advance("(string)");
return this;
}
if (state.tokens.next.type === "default") {
// ExportDeclaration ::
// export default [lookahead ∉ { function, class }] AssignmentExpression[In] ;
// export default HoistableDeclaration
// export default ClassDeclaration
state.nameStack.set(state.tokens.next);
advance("default");
var exportType = state.tokens.next.id;
if (exportType === "function" || exportType === "class") {
this.block = true;
}
token = peek();
expression(10);
identifier = token.value;
if (this.block) {
state.funct["(scope)"].addlabel(identifier, {
type: exportType,
initialized: true,
token: token });
state.funct["(scope)"].setExported(identifier, token);
}
return this;
}
if (state.tokens.next.value === "{") {
// ExportDeclaration :: export ExportClause
advance("{");
var exportedTokens = [];
while (!checkPunctuator(state.tokens.next, "}")) {
if (!state.tokens.next.identifier) {
error("E030", state.tokens.next, state.tokens.next.value);
}
advance();
exportedTokens.push(state.tokens.curr);
if (state.tokens.next.value === "as") {
advance("as");
if (!state.tokens.next.identifier) {
error("E030", state.tokens.next, state.tokens.next.value);
}
advance();
}
if (!checkPunctuator(state.tokens.next, "}")) {
advance(",");
}
}
advance("}");
if (state.tokens.next.value === "from") {
// ExportDeclaration :: export ExportClause FromClause
advance("from");
moduleSpecifier = state.tokens.next;
advance("(string)");
} else if (ok) {
exportedTokens.forEach(function(token) {
state.funct["(scope)"].setExported(token.value, token);
});
}
if (exportedTokens.length === 0) {
if (moduleSpecifier) {
warning("W142", this, "export", moduleSpecifier.value);
} else {
warning("W141", this, "export");
}
}
return this;
}
if (state.tokens.next.id === "var") {
// ExportDeclaration :: export VariableStatement
advance("var");
state.tokens.curr.fud({ inexport:true });
} else if (state.tokens.next.id === "let") {
// ExportDeclaration :: export VariableStatement
advance("let");
state.tokens.curr.fud({ inexport:true });
} else if (state.tokens.next.id === "const") {
// ExportDeclaration :: export VariableStatement
advance("const");
state.tokens.curr.fud({ inexport:true });
} else if (state.tokens.next.id === "function") {
// ExportDeclaration :: export Declaration
this.block = true;
advance("function");
state.syntax["function"].fud({ inexport:true });
} else if (state.tokens.next.id === "class") {
// ExportDeclaration :: export Declaration
this.block = true;
advance("class");
var classNameToken = state.tokens.next;
state.syntax["class"].fud();
state.funct["(scope)"].setExported(classNameToken.value, classNameToken);
} else {
error("E024", state.tokens.next, state.tokens.next.value);
}
return this;
}).exps = true;
/**
* Determine if SuperCall or SuperProperty may be used in the current context
* (as described by the provided "functor" object).
*
* @param {string} type - one of "property" or "call"
* @param {object} funct - a "functor" object describing the current function
* context
*
* @returns {boolean}
*/
function supportsSuper(type, funct) {
if (type === "property" && funct["(method)"]) {
return true;
}
if (type === "call" && funct["(statement)"] &&
funct["(statement)"].id === "class") {
return true;
}
if (funct["(arrow)"]) {
return supportsSuper(type, funct["(context)"]);
}
return false;
}
var superNud = function() {
var next = state.tokens.next;
if (checkPunctuators(next, ["[", "."])) {
if (!supportsSuper("property", state.funct)) {
error("E063", this);
}
} else if (checkPunctuator(next, "(")) {
if (!supportsSuper("call", state.funct)) {
error("E064", this);
}
} else {
error("E024", next, next.value || next.id);
}
return this;
};
// Future Reserved Words
FutureReservedWord("abstract");
FutureReservedWord("await", { es5: true, moduleOnly: true });
FutureReservedWord("boolean");
FutureReservedWord("byte");
FutureReservedWord("char");
FutureReservedWord("class", { es5: true, nud: classdef });
FutureReservedWord("double");
FutureReservedWord("enum", { es5: true });
FutureReservedWord("export", { es5: true });
FutureReservedWord("extends", { es5: true });
FutureReservedWord("final");
FutureReservedWord("float");
FutureReservedWord("goto");
FutureReservedWord("implements", { es5: true, strictOnly: true });
FutureReservedWord("import", { es5: true });
FutureReservedWord("int");
FutureReservedWord("interface", { es5: true, strictOnly: true });
FutureReservedWord("long");
FutureReservedWord("native");
FutureReservedWord("package", { es5: true, strictOnly: true });
FutureReservedWord("private", { es5: true, strictOnly: true });
FutureReservedWord("protected", { es5: true, strictOnly: true });
FutureReservedWord("public", { es5: true, strictOnly: true });
FutureReservedWord("short");
FutureReservedWord("static", { es5: true, strictOnly: true });
FutureReservedWord("super", { es5: true, nud: superNud });
FutureReservedWord("synchronized");
FutureReservedWord("transient");
FutureReservedWord("volatile");
// this function is used to determine whether a squarebracket or a curlybracket
// expression is a comprehension array, destructuring assignment or a json value.
var lookupBlockType = function() {
var pn, pn1, prev;
var i = -1;
var bracketStack = 0;
var ret = {};
if (checkPunctuators(state.tokens.curr, ["[", "{"])) {
bracketStack += 1;
}
do {
prev = i === -1 ? state.tokens.curr : pn;
pn = i === -1 ? state.tokens.next : peek(i);
pn1 = peek(i + 1);
i = i + 1;
if (checkPunctuators(pn, ["[", "{"])) {
bracketStack += 1;
} else if (checkPunctuators(pn, ["]", "}"])) {
bracketStack -= 1;
}
if (bracketStack === 1 && pn.identifier && pn.value === "for" &&
!checkPunctuator(prev, ".")) {
ret.isCompArray = true;
ret.notJson = true;
break;
}
if (bracketStack === 0 && checkPunctuators(pn, ["}", "]"])) {
if (pn1.value === "=") {
ret.isDestAssign = true;
ret.notJson = true;
break;
} else if (pn1.value === ".") {
ret.notJson = true;
break;
}
}
if (checkPunctuator(pn, ";")) {
ret.notJson = true;
}
} while (bracketStack > 0 && pn.id !== "(end)");
return ret;
};
function saveProperty(props, name, tkn, isClass, isStatic) {
var msg = ["key", "class method", "static class method"];
msg = msg[(isClass || false) + (isStatic || false)];
if (tkn.identifier) {
name = tkn.value;
}
if (props[name] && name !== "__proto__") {
warning("W075", state.tokens.next, msg, name);
} else {
props[name] = Object.create(null);
}
props[name].basic = true;
props[name].basictkn = tkn;
}
/**
* @param {string} accessorType - Either "get" or "set"
* @param {object} props - a collection of all properties of the object to
* which the current accessor is being assigned
* @param {object} tkn - the identifier token representing the accessor name
* @param {boolean} isClass - whether the accessor is part of an ES6 Class
* definition
* @param {boolean} isStatic - whether the accessor is a static method
*/
function saveAccessor(accessorType, props, name, tkn, isClass, isStatic) {
var flagName = accessorType === "get" ? "getterToken" : "setterToken";
var msg = "";
if (isClass) {
if (isStatic) {
msg += "static ";
}
msg += accessorType + "ter method";
} else {
msg = "key";
}
state.tokens.curr.accessorType = accessorType;
state.nameStack.set(tkn);
if (props[name]) {
if ((props[name].basic || props[name][flagName]) && name !== "__proto__") {
warning("W075", state.tokens.next, msg, name);
}
} else {
props[name] = Object.create(null);
}
props[name][flagName] = tkn;
}
function computedPropertyName() {
advance("[");
if (!state.inES6()) {
warning("W119", state.tokens.curr, "computed property names", "6");
}
var value = expression(10);
advance("]");
return value;
}
/**
* Test whether a given token is a punctuator matching one of the specified values
* @param {Token} token
* @param {Array.<string>} values
* @returns {boolean}
*/
function checkPunctuators(token, values) {
if (token.type === "(punctuator)") {
return _.includes(values, token.value);
}
return false;
}
/**
* Test whether a given token is a punctuator matching the specified value
* @param {Token} token
* @param {string} value
* @returns {boolean}
*/
function checkPunctuator(token, value) {
return token.type === "(punctuator)" && token.value === value;
}
// Check whether this function has been reached for a destructuring assign with undeclared values
function destructuringAssignOrJsonValue() {
// lookup for the assignment (ECMAScript 6 only)
// if it has semicolons, it is a block, so go parse it as a block
// or it's not a block, but there are assignments, check for undeclared variables
var block = lookupBlockType();
if (block.notJson) {
if (!state.inES6() && block.isDestAssign) {
warning("W104", state.tokens.curr, "destructuring assignment", "6");
}
statements();
// otherwise parse json value
} else {
state.option.laxbreak = true;
state.jsonMode = true;
jsonValue();
}
}
// array comprehension parsing function
// parses and defines the three states of the list comprehension in order
// to avoid defining global variables, but keeping them to the list comprehension scope
// only. The order of the states are as follows:
// * "use" which will be the returned iterative part of the list comprehension
// * "define" which will define the variables local to the list comprehension
// * "filter" which will help filter out values
var arrayComprehension = function() {
var CompArray = function() {
this.mode = "use";
this.variables = [];
};
var _carrays = [];
var _current;
function declare(v) {
var l = _current.variables.filter(function(elt) {
// if it has, change its undef state
if (elt.value === v) {
elt.undef = false;
return v;
}
}).length;
return l !== 0;
}
function use(v) {
var l = _current.variables.filter(function(elt) {
// and if it has been defined
if (elt.value === v && !elt.undef) {
if (elt.unused === true) {
elt.unused = false;
}
return v;
}
}).length;
// otherwise we warn about it
return (l === 0);
}
return { stack: function() {
_current = new CompArray();
_carrays.push(_current);
},
unstack: function() {
_current.variables.filter(function(v) {
if (v.unused)
warning("W098", v.token, v.token.raw_text || v.value);
if (v.undef)
state.funct["(scope)"].block.use(v.value, v.token);
});
_carrays.splice(-1, 1);
_current = _carrays[_carrays.length - 1];
},
setState: function(s) {
if (_.includes(["use", "define", "generate", "filter"], s))
_current.mode = s;
},
check: function(v) {
if (!_current) {
return;
}
// When we are in "use" state of the list comp, we enqueue that var
if (_current && _current.mode === "use") {
if (use(v)) {
_current.variables.push({
token: state.tokens.curr,
value: v,
undef: true,
unused: false
});
}
return true;
// When we are in "define" state of the list comp,
} else if (_current && _current.mode === "define") {
// check if the variable has been used previously
if (!declare(v)) {
_current.variables.push({
token: state.tokens.curr,
value: v,
undef: false,
unused: true
});
}
return true;
// When we are in the "generate" state of the list comp,
} else if (_current && _current.mode === "generate") {
state.funct["(scope)"].block.use(v, state.tokens.curr);
return true;
// When we are in "filter" state,
} else if (_current && _current.mode === "filter") {
// we check whether current variable has been declared
if (use(v)) {
// if not we warn about it
state.funct["(scope)"].block.use(v, state.tokens.curr);
}
return true;
}
return false;
}
};
};
// Parse JSON
function jsonValue() {
function jsonObject() {
var o = {}, t = state.tokens.next;
advance("{");
if (state.tokens.next.id !== "}") {
for (;;) {
if (state.tokens.next.id === "(end)") {
error("E026", state.tokens.next, t.line);
} else if (state.tokens.next.id === "}") {
warning("W094", state.tokens.curr);
break;
} else if (state.tokens.next.id === ",") {
error("E028", state.tokens.next);
} else if (state.tokens.next.id !== "(string)") {
warning("W095", state.tokens.next, state.tokens.next.value);
}
if (o[state.tokens.next.value] === true) {
warning("W075", state.tokens.next, "key", state.tokens.next.value);
} else if ((state.tokens.next.value === "__proto__" &&
!state.option.proto) || (state.tokens.next.value === "__iterator__" &&
!state.option.iterator)) {
warning("W096", state.tokens.next, state.tokens.next.value);
} else {
o[state.tokens.next.value] = true;
}
advance();
advance(":");
jsonValue();
if (state.tokens.next.id !== ",") {
break;
}
advance(",");
}
}
advance("}");
}
function jsonArray() {
var t = state.tokens.next;
advance("[");
if (state.tokens.next.id !== "]") {
for (;;) {
if (state.tokens.next.id === "(end)") {
error("E027", state.tokens.next, t.line);
} else if (state.tokens.next.id === "]") {
warning("W094", state.tokens.curr);
break;
} else if (state.tokens.next.id === ",") {
error("E028", state.tokens.next);
}
jsonValue();
if (state.tokens.next.id !== ",") {
break;
}
advance(",");
}
}
advance("]");
}
switch (state.tokens.next.id) {
case "{":
jsonObject();
break;
case "[":
jsonArray();
break;
case "true":
case "false":
case "null":
case "(number)":
case "(string)":
advance();
break;
case "-":
advance("-");
advance("(number)");
break;
default:
error("E003", state.tokens.next);
}
}
/**
* Lint dynamically-evaluated code, appending any resulting errors/warnings
* into the global `errors` array.
*
* @param {array} internals - collection of "internals" objects describing
* string tokens that contain evaluated code
* @param {object} options - linting options to apply
* @param {object} globals - globally-defined bindings for the evaluated code
*/
function lintEvalCode(internals, options, globals) {
var priorErrorCount, idx, jdx, internal;
for (idx = 0; idx < internals.length; idx += 1) {
internal = internals[idx];
options.scope = internal.elem;
priorErrorCount = JSHINT.errors.length;
itself(internal.code, options, globals);
for (jdx = priorErrorCount; jdx < JSHINT.errors.length; jdx += 1) {
JSHINT.errors[jdx].line += internal.token.line - 1;
}
}
}
var escapeRegex = function(str) {
return str.replace(/[-\/\\^$*+?.()|[\]{}]/g, "\\$&");
};
// The actual JSHINT function itself.
var itself = function(s, o, g) {
var x, reIgnoreStr, reIgnore;
var optionKeys;
var newOptionObj = {};
var newIgnoredObj = {};
o = _.clone(o);
state.reset();
if (o && o.scope) {
JSHINT.scope = o.scope;
} else {
JSHINT.errors = [];
JSHINT.internals = [];
JSHINT.blacklist = {};
JSHINT.scope = "(main)";
}
predefined = Object.create(null);
combine(predefined, vars.ecmaIdentifiers[3]);
combine(predefined, vars.reservedVars);
combine(predefined, g || {});
declared = Object.create(null);
var exported = Object.create(null); // Variables that live outside the current file
function each(obj, cb) {
if (!obj)
return;
if (!Array.isArray(obj) && typeof obj === "object")
obj = Object.keys(obj);
obj.forEach(cb);
}
if (o) {
each(o.predef || null, function(item) {
var slice, prop;
if (item[0] === "-") {
slice = item.slice(1);
JSHINT.blacklist[slice] = slice;
// remove from predefined if there
delete predefined[slice];
} else {
prop = Object.getOwnPropertyDescriptor(o.predef, item);
predefined[item] = prop ? prop.value : false;
}
});
each(o.exported || null, function(item) {
exported[item] = true;
});
delete o.predef;
delete o.exported;
optionKeys = Object.keys(o);
for (x = 0; x < optionKeys.length; x++) {
if (/^-W\d{3}$/g.test(optionKeys[x])) {
newIgnoredObj[optionKeys[x].slice(1)] = true;
} else {
var optionKey = optionKeys[x];
newOptionObj[optionKey] = o[optionKey];
}
}
}
state.option = newOptionObj;
state.ignored = newIgnoredObj;
state.option.indent = state.option.indent || 4;
state.option.maxerr = state.option.maxerr || 50;
indent = 1;
var scopeManagerInst = scopeManager(state, predefined, exported, declared);
scopeManagerInst.on("warning", function(ev) {
warning.apply(null, [ ev.code, ev.token].concat(ev.data));
});
scopeManagerInst.on("error", function(ev) {
error.apply(null, [ ev.code, ev.token ].concat(ev.data));
});
state.funct = functor("(global)", null, {
"(global)" : true,
"(scope)" : scopeManagerInst,
"(comparray)" : arrayComprehension(),
"(metrics)" : createMetrics(state.tokens.next)
});
functions = [state.funct];
urls = [];
member = {};
membersOnly = null;
inblock = false;
lookahead = [];
if (!isString(s) && !Array.isArray(s)) {
errorAt("E004", 0);
return false;
}
api = {
get isJSON() {
return state.jsonMode;
},
getOption: function(name) {
return state.option[name] || null;
},
getCache: function(name) {
return state.cache[name];
},
setCache: function(name, value) {
state.cache[name] = value;
},
warn: function(code, data) {
warningAt.apply(null, [ code, data.line, data.char ].concat(data.data));
},
on: function(names, listener) {
names.split(" ").forEach(function(name) {
emitter.on(name, listener);
}.bind(this));
}
};
emitter.removeAllListeners();
(extraModules || []).forEach(function(func) {
func(api);
});
state.tokens.prev = state.tokens.curr = state.tokens.next = state.syntax["(begin)"];
if (o && o.ignoreDelimiters) {
if (!Array.isArray(o.ignoreDelimiters)) {
o.ignoreDelimiters = [o.ignoreDelimiters];
}
o.ignoreDelimiters.forEach(function(delimiterPair) {
if (!delimiterPair.start || !delimiterPair.end)
return;
reIgnoreStr = escapeRegex(delimiterPair.start) +
"[\\s\\S]*?" +
escapeRegex(delimiterPair.end);
reIgnore = new RegExp(reIgnoreStr, "ig");
s = s.replace(reIgnore, function(match) {
return match.replace(/./g, " ");
});
});
}
lex = new Lexer(s);
lex.on("warning", function(ev) {
warningAt.apply(null, [ ev.code, ev.line, ev.character].concat(ev.data));
});
lex.on("error", function(ev) {
errorAt.apply(null, [ ev.code, ev.line, ev.character ].concat(ev.data));
});
lex.on("fatal", function(ev) {
quit("E041", ev);
});
lex.on("Identifier", function(ev) {
emitter.emit("Identifier", ev);
});
lex.on("String", function(ev) {
emitter.emit("String", ev);
});
lex.on("Number", function(ev) {
emitter.emit("Number", ev);
});
// Check options
for (var name in o) {
if (_.has(o, name)) {
checkOption(name, state.tokens.curr);
}
}
try {
applyOptions();
// combine the passed globals after we've assumed all our options
combine(predefined, g || {});
//reset values
parseComma.first = true;
advance();
switch (state.tokens.next.id) {
case "{":
case "[":
destructuringAssignOrJsonValue();
break;
default:
directives();
if (state.directive["use strict"]) {
if (!state.allowsGlobalUsd()) {
warning("W097", state.tokens.prev);
}
}
statements();
}
if (state.tokens.next.id !== "(end)") {
quit("E041", state.tokens.curr);
}
state.funct["(scope)"].unstack();
} catch (err) {
if (err && err.name === "JSHintError") {
var nt = state.tokens.next || {};
JSHINT.errors.push({
scope : "(main)",
raw : err.raw,
code : err.code,
reason : err.reason,
line : err.line || nt.line,
character : err.character || nt.from
});
} else {
throw err;
}
}
// Loop over the listed "internals", and check them as well.
if (JSHINT.scope === "(main)") {
lintEvalCode(JSHINT.internals, o || {}, g);
}
return JSHINT.errors.length === 0;
};
// Modules.
itself.addModule = function(func) {
extraModules.push(func);
};
itself.addModule(style.register);
// Data summary.
itself.data = function() {
var data = {
functions: [],
options: state.option
};
var fu, f, i, n, globals;
if (itself.errors.length) {
data.errors = itself.errors;
}
if (state.jsonMode) {
data.json = true;
}
var impliedGlobals = state.funct["(scope)"].getImpliedGlobals();
if (impliedGlobals.length > 0) {
data.implieds = impliedGlobals;
}
if (urls.length > 0) {
data.urls = urls;
}
globals = state.funct["(scope)"].getUsedOrDefinedGlobals();
if (globals.length > 0) {
data.globals = globals;
}
for (i = 1; i < functions.length; i += 1) {
f = functions[i];
fu = {};
fu.name = f["(name)"];
fu.param = f["(params)"];
fu.line = f["(line)"];
fu.character = f["(character)"];
fu.last = f["(last)"];
fu.lastcharacter = f["(lastcharacter)"];
fu.metrics = {
complexity: f["(metrics)"].ComplexityCount,
parameters: f["(metrics)"].arity,
statements: f["(metrics)"].statementCount
};
data.functions.push(fu);
}
var unuseds = state.funct["(scope)"].getUnuseds();
if (unuseds.length > 0) {
data.unused = unuseds;
}
for (n in member) {
if (typeof member[n] === "number") {
data.member = member;
break;
}
}
return data;
};
itself.jshint = itself;
return itself;
}());
// Make JSHINT a Node module, if possible.
if (typeof exports === "object" && exports) {
exports.JSHINT = JSHINT;
}