/* ***** BEGIN LICENSE BLOCK *****
 * Distributed under the BSD license:
 *
 * Copyright (c) 2012, Ajax.org B.V.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of Ajax.org B.V. nor the
 *       names of its contributors may be used to endorse or promote products
 *       derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL AJAX.ORG B.V. BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * ***** END LICENSE BLOCK ***** */

define(function (require, exports, module) {
    "use strict";

    exports.parForEach = function (array, fn, callback) {
        var completed = 0;
        var arLength = array.length;
        if (arLength === 0)
            callback();
        for (var i = 0; i < arLength; i++) {
            fn(array[i], function (result, err) {
                completed++;
                if (completed === arLength)
                    callback(result, err);
            });
        }
    };

    var ID_REGEX = /[a-zA-Z_0-9\$\-\u00A2-\uFFFF]/;

    exports.retrievePrecedingIdentifier = function (text, pos, regex) {
        regex = regex || ID_REGEX;
        var buf = [];
        for (var i = pos - 1; i >= 0; i--) {
            if (regex.test(text[i]))
                buf.push(text[i]);
            else
                break;
        }
        return buf.reverse().join("");
    };

    exports.retrieveFollowingIdentifier = function (text, pos, regex) {
        regex = regex || ID_REGEX;
        var buf = [];
        for (var i = pos; i < text.length; i++) {
            if (regex.test(text[i]))
                buf.push(text[i]);
            else
                break;
        }
        return buf;
    };

    exports.getCompletionPrefix = function (editor) {
        var pos = editor.getCursorPosition();
        var line = editor.session.getLine(pos.row);
        var prefix;
        editor.completers.forEach(function (completer) {
            if (completer.identifierRegexps) {
                completer.identifierRegexps.forEach(function (identifierRegex) {
                    if (!prefix && identifierRegex)
                        prefix = this.retrievePrecedingIdentifier(line, pos.column, identifierRegex);
                }.bind(this));
            }
        }.bind(this));
        return prefix || this.retrievePrecedingIdentifier(line, pos.column);
    };

});
