'use strict';

var list = require('postcss').list;

module.exports = {

    /**
     * Throw special error, to tell beniary,
     * that this error is from Autoprefixer.
     */
    error: function error(text) {
        var err = new Error(text);
        err.autoprefixer = true;
        throw err;
    },


    /**
     * Return array, that doesn’t contain duplicates.
     */
    uniq: function uniq(array) {
        var filtered = [];
        for (var _iterator = array, _isArray = Array.isArray(_iterator), _i = 0, _iterator = _isArray ? _iterator : _iterator[Symbol.iterator]();;) {
            var _ref;

            if (_isArray) {
                if (_i >= _iterator.length) break;
                _ref = _iterator[_i++];
            } else {
                _i = _iterator.next();
                if (_i.done) break;
                _ref = _i.value;
            }

            var i = _ref;

            if (filtered.indexOf(i) === -1) {
                filtered.push(i);
            }
        }
        return filtered;
    },


    /**
     * Return "-webkit-" on "-webkit- old"
     */
    removeNote: function removeNote(string) {
        if (string.indexOf(' ') === -1) {
            return string;
        }

        return string.split(' ')[0];
    },


    /**
     * Escape RegExp symbols
     */
    escapeRegexp: function escapeRegexp(string) {
        return string.replace(/[.?*+\^\$\[\]\\(){}|\-]/g, '\\$&');
    },


    /**
     * Return regexp to check, that CSS string contain word
     */
    regexp: function regexp(word) {
        var escape = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : true;

        if (escape) {
            word = this.escapeRegexp(word);
        }
        return new RegExp('(^|[\\s,(])(' + word + '($|[\\s(,]))', 'gi');
    },


    /**
     * Change comma list
     */
    editList: function editList(value, callback) {
        var origin = list.comma(value);
        var changed = callback(origin, []);

        if (origin === changed) {
            return value;
        }

        var join = value.match(/,\s*/);
        join = join ? join[0] : ', ';
        return changed.join(join);
    }
};