119 lines
3.1 KiB
JavaScript
119 lines
3.1 KiB
JavaScript
/**
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* Property keyword parser module
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*
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* Copyright (C) 2010, 2011, 2012, 2013, 2014, 2015 Free Software Foundation, Inc.
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* Free Software Foundation, Inc.
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*
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* This file is part of GNU ease.js.
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*
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* ease.js is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**
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* Known (permitted) keywords
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* @type {Object.<string,boolean>}
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*/
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var _keywords = {
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'public': 1,
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'protected': 1<<1,
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'private': 1<<2,
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'static': 1<<3,
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'abstract': 1<<4,
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'const': 1<<5,
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'virtual': 1<<6,
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'override': 1<<7,
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'proxy': 1<<8,
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'weak': 1<<9,
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};
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/**
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* Keyword masks for conveniently checking the keyword bitfield
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* @type {Object.<string,integer>}
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*/
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var _kmasks = {
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amods: _keywords[ 'public' ]
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| _keywords[ 'protected' ]
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| _keywords[ 'private' ],
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'virtual': _keywords[ 'abstract' ]
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| _keywords[ 'virtual' ],
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};
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// expose magic values
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exports.kvals = _keywords;
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exports.kmasks = _kmasks;
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/**
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* Parses property keywords
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*
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* @param {string} prop property string, which may contain keywords
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*
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* @return {{name: string, bitwords: number, keywords: Object.<string, boolean>}}
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*/
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exports.parseKeywords = function ( prop )
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{
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var name = prop,
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keywords = [],
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bitwords = 0x00,
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keyword_obj = {};
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prop = ''+( prop );
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// the keywords are all words, except for the last, which is the
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// property name
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if ( ( keywords = prop.split( /\s+/ ) ).length !== 1 )
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{
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name = keywords.pop();
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var i = keywords.length;
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while ( i-- )
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{
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var keyword = keywords[ i ],
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kval = _keywords[ keyword ];
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// ensure the keyword is recognized
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if ( !kval )
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{
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throw Error(
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"Unexpected keyword for '" + name + "': " + keyword
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);
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}
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// ease-of-access
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keyword_obj[ keyword ] = true;
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// permits quick and concise checks
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bitwords |= kval;
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}
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}
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// members with an underscore prefix are implicitly private, unless an
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// access modifier is explicitly provided; double-underscore is ingored,
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// as they denote special members that do not become part of the
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// prototype and are reserved by ease.js
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if ( ( name.match( /^_[^_]/ ) && !( bitwords & _kmasks.amods ) ) )
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{
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keyword_obj[ 'private' ] = true;
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bitwords |= _keywords[ 'private' ];
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}
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return {
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name: name,
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keywords: keyword_obj,
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bitwords: bitwords,
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};
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}
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