/*
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Copyright (C) 2013 Yusuke Suzuki <utatane.tea@gmail.com>
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
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DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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(function () {
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'use strict';
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var code = require('./code');
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function isStrictModeReservedWordES6(id) {
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switch (id) {
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case 'implements':
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case 'interface':
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case 'package':
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case 'private':
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case 'protected':
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case 'public':
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case 'static':
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case 'let':
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return true;
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default:
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return false;
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}
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}
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function isKeywordES5(id, strict) {
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// yield should not be treated as keyword under non-strict mode.
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if (!strict && id === 'yield') {
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return false;
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}
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return isKeywordES6(id, strict);
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}
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function isKeywordES6(id, strict) {
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if (strict && isStrictModeReservedWordES6(id)) {
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return true;
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}
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switch (id.length) {
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case 2:
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return (id === 'if') || (id === 'in') || (id === 'do');
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case 3:
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return (id === 'var') || (id === 'for') || (id === 'new') || (id === 'try');
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case 4:
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return (id === 'this') || (id === 'else') || (id === 'case') ||
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(id === 'void') || (id === 'with') || (id === 'enum');
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case 5:
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return (id === 'while') || (id === 'break') || (id === 'catch') ||
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(id === 'throw') || (id === 'const') || (id === 'yield') ||
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(id === 'class') || (id === 'super');
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case 6:
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return (id === 'return') || (id === 'typeof') || (id === 'delete') ||
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(id === 'switch') || (id === 'export') || (id === 'import');
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case 7:
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return (id === 'default') || (id === 'finally') || (id === 'extends');
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case 8:
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return (id === 'function') || (id === 'continue') || (id === 'debugger');
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case 10:
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return (id === 'instanceof');
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default:
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return false;
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}
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}
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function isReservedWordES5(id, strict) {
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return id === 'null' || id === 'true' || id === 'false' || isKeywordES5(id, strict);
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}
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function isReservedWordES6(id, strict) {
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return id === 'null' || id === 'true' || id === 'false' || isKeywordES6(id, strict);
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}
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function isRestrictedWord(id) {
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return id === 'eval' || id === 'arguments';
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}
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function isIdentifierNameES5(id) {
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var i, iz, ch;
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if (id.length === 0) { return false; }
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ch = id.charCodeAt(0);
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if (!code.isIdentifierStartES5(ch)) {
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return false;
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}
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for (i = 1, iz = id.length; i < iz; ++i) {
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ch = id.charCodeAt(i);
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if (!code.isIdentifierPartES5(ch)) {
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return false;
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}
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}
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return true;
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}
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function decodeUtf16(lead, trail) {
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return (lead - 0xD800) * 0x400 + (trail - 0xDC00) + 0x10000;
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}
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function isIdentifierNameES6(id) {
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var i, iz, ch, lowCh, check;
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if (id.length === 0) { return false; }
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check = code.isIdentifierStartES6;
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for (i = 0, iz = id.length; i < iz; ++i) {
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ch = id.charCodeAt(i);
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if (0xD800 <= ch && ch <= 0xDBFF) {
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++i;
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if (i >= iz) { return false; }
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lowCh = id.charCodeAt(i);
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if (!(0xDC00 <= lowCh && lowCh <= 0xDFFF)) {
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return false;
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}
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ch = decodeUtf16(ch, lowCh);
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}
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if (!check(ch)) {
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return false;
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}
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check = code.isIdentifierPartES6;
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}
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return true;
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}
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function isIdentifierES5(id, strict) {
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return isIdentifierNameES5(id) && !isReservedWordES5(id, strict);
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}
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function isIdentifierES6(id, strict) {
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return isIdentifierNameES6(id) && !isReservedWordES6(id, strict);
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}
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module.exports = {
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isKeywordES5: isKeywordES5,
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isKeywordES6: isKeywordES6,
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isReservedWordES5: isReservedWordES5,
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isReservedWordES6: isReservedWordES6,
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isRestrictedWord: isRestrictedWord,
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isIdentifierNameES5: isIdentifierNameES5,
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isIdentifierNameES6: isIdentifierNameES6,
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isIdentifierES5: isIdentifierES5,
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isIdentifierES6: isIdentifierES6
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};
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}());
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/* vim: set sw=4 ts=4 et tw=80 : */
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