/
escodegen.js
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/
escodegen.js
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/*
Copyright (C) 2012 Robert Gust-Bardon <donate@robert.gust-bardon.org>
Copyright (C) 2012 John Freeman <jfreeman08@gmail.com>
Copyright (C) 2012 Ariya Hidayat <ariya.hidayat@gmail.com>
Copyright (C) 2012 Mathias Bynens <mathias@qiwi.be>
Copyright (C) 2012 Joost-Wim Boekesteijn <joost-wim@boekesteijn.nl>
Copyright (C) 2012 Kris Kowal <kris.kowal@cixar.com>
Copyright (C) 2012 Yusuke Suzuki <utatane.tea@gmail.com>
Copyright (C) 2012 Arpad Borsos <arpad.borsos@googlemail.com>
Copyright (C) 2011 Ariya Hidayat <ariya.hidayat@gmail.com>
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.
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 <COPYRIGHT HOLDER> 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.
*/
/*jslint bitwise:true */
/*global escodegen:true, exports:true, generateStatement: true*/
(function (exports) {
'use strict';
var Syntax,
Precedence,
BinaryPrecedence,
Regex,
VisitorKeys,
VisitorOption,
isArray,
base,
indent,
json,
renumber,
hexadecimal,
quotes,
escapeless,
newline,
space,
parentheses,
semicolons,
extra,
parse;
Syntax = {
AssignmentExpression: 'AssignmentExpression',
ArrayExpression: 'ArrayExpression',
BlockStatement: 'BlockStatement',
BinaryExpression: 'BinaryExpression',
BreakStatement: 'BreakStatement',
CallExpression: 'CallExpression',
CatchClause: 'CatchClause',
ConditionalExpression: 'ConditionalExpression',
ContinueStatement: 'ContinueStatement',
DoWhileStatement: 'DoWhileStatement',
DebuggerStatement: 'DebuggerStatement',
EmptyStatement: 'EmptyStatement',
ExpressionStatement: 'ExpressionStatement',
ForStatement: 'ForStatement',
ForInStatement: 'ForInStatement',
FunctionDeclaration: 'FunctionDeclaration',
FunctionExpression: 'FunctionExpression',
Identifier: 'Identifier',
IfStatement: 'IfStatement',
Literal: 'Literal',
LabeledStatement: 'LabeledStatement',
LogicalExpression: 'LogicalExpression',
MemberExpression: 'MemberExpression',
NewExpression: 'NewExpression',
ObjectExpression: 'ObjectExpression',
Program: 'Program',
Property: 'Property',
ReturnStatement: 'ReturnStatement',
SequenceExpression: 'SequenceExpression',
SwitchStatement: 'SwitchStatement',
SwitchCase: 'SwitchCase',
ThisExpression: 'ThisExpression',
ThrowStatement: 'ThrowStatement',
TryStatement: 'TryStatement',
UnaryExpression: 'UnaryExpression',
UpdateExpression: 'UpdateExpression',
VariableDeclaration: 'VariableDeclaration',
VariableDeclarator: 'VariableDeclarator',
WhileStatement: 'WhileStatement',
WithStatement: 'WithStatement'
};
Precedence = {
Sequence: 0,
Assignment: 1,
Conditional: 2,
LogicalOR: 3,
LogicalAND: 4,
BitwiseOR: 5,
BitwiseXOR: 6,
BitwiseAND: 7,
Equality: 8,
Relational: 9,
BitwiseSHIFT: 10,
Additive: 11,
Multiplicative: 12,
Unary: 13,
Postfix: 14,
Call: 15,
New: 16,
Member: 17,
Primary: 18
};
BinaryPrecedence = {
'||': Precedence.LogicalOR,
'&&': Precedence.LogicalAND,
'|': Precedence.BitwiseOR,
'^': Precedence.BitwiseXOR,
'&': Precedence.BitwiseAND,
'==': Precedence.Equality,
'!=': Precedence.Equality,
'===': Precedence.Equality,
'!==': Precedence.Equality,
'<': Precedence.Relational,
'>': Precedence.Relational,
'<=': Precedence.Relational,
'>=': Precedence.Relational,
'in': Precedence.Relational,
'instanceof': Precedence.Relational,
'<<': Precedence.BitwiseSHIFT,
'>>': Precedence.BitwiseSHIFT,
'>>>': Precedence.BitwiseSHIFT,
'+': Precedence.Additive,
'-': Precedence.Additive,
'*': Precedence.Multiplicative,
'%': Precedence.Multiplicative,
'/': Precedence.Multiplicative
};
Regex = {
NonAsciiIdentifierPart: new RegExp('[\xaa\xb5\xba\xc0-\xd6\xd8-\xf6\xf8-\u02c1\u02c6-\u02d1\u02e0-\u02e4\u02ec\u02ee\u0300-\u0374\u0376\u0377\u037a-\u037d\u0386\u0388-\u038a\u038c\u038e-\u03a1\u03a3-\u03f5\u03f7-\u0481\u0483-\u0487\u048a-\u0527\u0531-\u0556\u0559\u0561-\u0587\u0591-\u05bd\u05bf\u05c1\u05c2\u05c4\u05c5\u05c7\u05d0-\u05ea\u05f0-\u05f2\u0610-\u061a\u0620-\u0669\u066e-\u06d3\u06d5-\u06dc\u06df-\u06e8\u06ea-\u06fc\u06ff\u0710-\u074a\u074d-\u07b1\u07c0-\u07f5\u07fa\u0800-\u082d\u0840-\u085b\u08a0\u08a2-\u08ac\u08e4-\u08fe\u0900-\u0963\u0966-\u096f\u0971-\u0977\u0979-\u097f\u0981-\u0983\u0985-\u098c\u098f\u0990\u0993-\u09a8\u09aa-\u09b0\u09b2\u09b6-\u09b9\u09bc-\u09c4\u09c7\u09c8\u09cb-\u09ce\u09d7\u09dc\u09dd\u09df-\u09e3\u09e6-\u09f1\u0a01-\u0a03\u0a05-\u0a0a\u0a0f\u0a10\u0a13-\u0a28\u0a2a-\u0a30\u0a32\u0a33\u0a35\u0a36\u0a38\u0a39\u0a3c\u0a3e-\u0a42\u0a47\u0a48\u0a4b-\u0a4d\u0a51\u0a59-\u0a5c\u0a5e\u0a66-\u0a75\u0a81-\u0a83\u0a85-\u0a8d\u0a8f-\u0a91\u0a93-\u0aa8\u0aaa-\u0ab0\u0ab2\u0ab3\u0ab5-\u0ab9\u0abc-\u0ac5\u0ac7-\u0ac9\u0acb-\u0acd\u0ad0\u0ae0-\u0ae3\u0ae6-\u0aef\u0b01-\u0b03\u0b05-\u0b0c\u0b0f\u0b10\u0b13-\u0b28\u0b2a-\u0b30\u0b32\u0b33\u0b35-\u0b39\u0b3c-\u0b44\u0b47\u0b48\u0b4b-\u0b4d\u0b56\u0b57\u0b5c\u0b5d\u0b5f-\u0b63\u0b66-\u0b6f\u0b71\u0b82\u0b83\u0b85-\u0b8a\u0b8e-\u0b90\u0b92-\u0b95\u0b99\u0b9a\u0b9c\u0b9e\u0b9f\u0ba3\u0ba4\u0ba8-\u0baa\u0bae-\u0bb9\u0bbe-\u0bc2\u0bc6-\u0bc8\u0bca-\u0bcd\u0bd0\u0bd7\u0be6-\u0bef\u0c01-\u0c03\u0c05-\u0c0c\u0c0e-\u0c10\u0c12-\u0c28\u0c2a-\u0c33\u0c35-\u0c39\u0c3d-\u0c44\u0c46-\u0c48\u0c4a-\u0c4d\u0c55\u0c56\u0c58\u0c59\u0c60-\u0c63\u0c66-\u0c6f\u0c82\u0c83\u0c85-\u0c8c\u0c8e-\u0c90\u0c92-\u0ca8\u0caa-\u0cb3\u0cb5-\u0cb9\u0cbc-\u0cc4\u0cc6-\u0cc8\u0cca-\u0ccd\u0cd5\u0cd6\u0cde\u0ce0-\u0ce3\u0ce6-\u0cef\u0cf1\u0cf2\u0d02\u0d03\u0d05-\u0d0c\u0d0e-\u0d10\u0d12-\u0d3a\u0d3d-\u0d44\u0d46-\u0d48\u0d4a-\u0d4e\u0d57\u0d60-\u0d63\u0d66-\u0d6f\u0d7a-\u0d7f\u0d82\u0d83\u0d85-\u0d96\u0d9a-\u0db1\u0db3-\u0dbb\u0dbd\u0dc0-\u0dc6\u0dca\u0dcf-\u0dd4\u0dd6\u0dd8-\u0ddf\u0df2\u0df3\u0e01-\u0e3a\u0e40-\u0e4e\u0e50-\u0e59\u0e81\u0e82\u0e84\u0e87\u0e88\u0e8a\u0e8d\u0e94-\u0e97\u0e99-\u0e9f\u0ea1-\u0ea3\u0ea5\u0ea7\u0eaa\u0eab\u0ead-\u0eb9\u0ebb-\u0ebd\u0ec0-\u0ec4\u0ec6\u0ec8-\u0ecd\u0ed0-\u0ed9\u0edc-\u0edf\u0f00\u0f18\u0f19\u0f20-\u0f29\u0f35\u0f37\u0f39\u0f3e-\u0f47\u0f49-\u0f6c\u0f71-\u0f84\u0f86-\u0f97\u0f99-\u0fbc\u0fc6\u1000-\u1049\u1050-\u109d\u10a0-\u10c5\u10c7\u10cd\u10d0-\u10fa\u10fc-\u1248\u124a-\u124d\u1250-\u1256\u1258\u125a-\u125d\u1260-\u1288\u128a-\u128d\u1290-\u12b0\u12b2-\u12b5\u12b8-\u12be\u12c0\u12c2-\u12c5\u12c8-\u12d6\u12d8-\u1310\u1312-\u1315\u1318-\u135a\u135d-\u135f\u1380-\u138f\u13a0-\u13f4\u1401-\u166c\u166f-\u167f\u1681-\u169a\u16a0-\u16ea\u16ee-\u16f0\u1700-\u170c\u170e-\u1714\u1720-\u1734\u1740-\u1753\u1760-\u176c\u176e-\u1770\u1772\u1773\u1780-\u17d3\u17d7\u17dc\u17dd\u17e0-\u17e9\u180b-\u180d\u1810-\u1819\u1820-\u1877\u1880-\u18aa\u18b0-\u18f5\u1900-\u191c\u1920-\u192b\u1930-\u193b\u1946-\u196d\u1970-\u1974\u1980-\u19ab\u19b0-\u19c9\u19d0-\u19d9\u1a00-\u1a1b\u1a20-\u1a5e\u1a60-\u1a7c\u1a7f-\u1a89\u1a90-\u1a99\u1aa7\u1b00-\u1b4b\u1b50-\u1b59\u1b6b-\u1b73\u1b80-\u1bf3\u1c00-\u1c37\u1c40-\u1c49\u1c4d-\u1c7d\u1cd0-\u1cd2\u1cd4-\u1cf6\u1d00-\u1de6\u1dfc-\u1f15\u1f18-\u1f1d\u1f20-\u1f45\u1f48-\u1f4d\u1f50-\u1f57\u1f59\u1f5b\u1f5d\u1f5f-\u1f7d\u1f80-\u1fb4\u1fb6-\u1fbc\u1fbe\u1fc2-\u1fc4\u1fc6-\u1fcc\u1fd0-\u1fd3\u1fd6-\u1fdb\u1fe0-\u1fec\u1ff2-\u1ff4\u1ff6-\u1ffc\u200c\u200d\u203f\u2040\u2054\u2071\u207f\u2090-\u209c\u20d0-\u20dc\u20e1\u20e5-\u20f0\u2102\u2107\u210a-\u2113\u2115\u2119-\u211d\u2124\u2126\u2128\u212a-\u212d\u212f-\u2139\u213c-\u213f\u2145-\u2149\u214e\u2160-\u2188\u2c00-\u2c2e\u2c30-\u2c5e\u2c60-\u2ce4\u2ceb-\u2cf3\u2d00-\u2d25\u2d27\u2d2d\u2d30-\u2d67\u2d6f\u2d7f-\u2d96\u2da0-\u2da6\u2da8-\u2dae\u2db0-\u2db6\u2db8-\u2dbe\u2dc0-\u2dc6\u2dc8-\u2dce\u2dd0-\u2dd6\u2dd8-\u2dde\u2de0-\u2dff\u2e2f\u3005-\u3007\u3021-\u302f\u3031-\u3035\u3038-\u303c\u3041-\u3096\u3099\u309a\u309d-\u309f\u30a1-\u30fa\u30fc-\u30ff\u3105-\u312d\u3131-\u318e\u31a0-\u31ba\u31f0-\u31ff\u3400-\u4db5\u4e00-\u9fcc\ua000-\ua48c\ua4d0-\ua4fd\ua500-\ua60c\ua610-\ua62b\ua640-\ua66f\ua674-\ua67d\ua67f-\ua697\ua69f-\ua6f1\ua717-\ua71f\ua722-\ua788\ua78b-\ua78e\ua790-\ua793\ua7a0-\ua7aa\ua7f8-\ua827\ua840-\ua873\ua880-\ua8c4\ua8d0-\ua8d9\ua8e0-\ua8f7\ua8fb\ua900-\ua92d\ua930-\ua953\ua960-\ua97c\ua980-\ua9c0\ua9cf-\ua9d9\uaa00-\uaa36\uaa40-\uaa4d\uaa50-\uaa59\uaa60-\uaa76\uaa7a\uaa7b\uaa80-\uaac2\uaadb-\uaadd\uaae0-\uaaef\uaaf2-\uaaf6\uab01-\uab06\uab09-\uab0e\uab11-\uab16\uab20-\uab26\uab28-\uab2e\uabc0-\uabea\uabec\uabed\uabf0-\uabf9\uac00-\ud7a3\ud7b0-\ud7c6\ud7cb-\ud7fb\uf900-\ufa6d\ufa70-\ufad9\ufb00-\ufb06\ufb13-\ufb17\ufb1d-\ufb28\ufb2a-\ufb36\ufb38-\ufb3c\ufb3e\ufb40\ufb41\ufb43\ufb44\ufb46-\ufbb1\ufbd3-\ufd3d\ufd50-\ufd8f\ufd92-\ufdc7\ufdf0-\ufdfb\ufe00-\ufe0f\ufe20-\ufe26\ufe33\ufe34\ufe4d-\ufe4f\ufe70-\ufe74\ufe76-\ufefc\uff10-\uff19\uff21-\uff3a\uff3f\uff41-\uff5a\uff66-\uffbe\uffc2-\uffc7\uffca-\uffcf\uffd2-\uffd7\uffda-\uffdc]')
};
function getDefaultOptions() {
// default options
return {
indent: null,
base: null,
parse: null,
comment: false,
format: {
indent: {
style: ' ',
base: 0,
adjustMultilineComment: false
},
json: false,
renumber: false,
hexadecimal: false,
quotes: 'single',
escapeless: false,
compact: false,
parentheses: true,
semicolons: true
}
};
}
function stringToArray(str) {
var length = str.length,
result = [],
i;
for (i = 0; i < length; i += 1) {
result[i] = str.charAt(i);
}
return result;
}
function stringRepeat(str, num) {
var result = '';
for (num |= 0; num > 0; num >>>= 1, str += str) {
if (num & 1) {
result += str;
}
}
return result;
}
isArray = Array.isArray;
if (!isArray) {
isArray = function isArray(array) {
return Object.prototype.toString.call(array) === '[object Array]';
};
}
function endsWithLineTerminator(str) {
var len, ch;
len = str.length;
ch = str.charAt(len - 1);
return ch === '\r' || ch === '\n';
}
function shallowCopy(obj) {
var ret = {}, key;
for (key in obj) {
if (obj.hasOwnProperty(key)) {
ret[key] = obj[key];
}
}
return ret;
}
function deepCopy(obj) {
var ret = {}, key, val;
for (key in obj) {
if (obj.hasOwnProperty(key)) {
val = obj[key];
if (typeof val === 'object' && val !== null) {
ret[key] = deepCopy(val);
} else {
ret[key] = val;
}
}
}
return ret;
}
function updateDeeply(target, override) {
var key, val;
function isHashObject(target) {
return typeof target === 'object' && target instanceof Object && !(target instanceof RegExp);
}
for (key in override) {
if (override.hasOwnProperty(key)) {
val = override[key];
if (isHashObject(val)) {
if (isHashObject(target[key])) {
updateDeeply(target[key], val);
} else {
target[key] = updateDeeply({}, val);
}
} else {
target[key] = val;
}
}
}
return target;
}
function generateNumber(value) {
var result, point, temp, exponent, pos;
if (value !== value) {
throw new Error('Numeric literal whose value is NaN');
}
if (1 / value < 0) {
throw new Error('Numeric literal whose value is negative');
}
if (value === 1 / 0) {
return json ? 'null' : renumber ? '1e400' : '1e+400';
}
result = '' + value;
if (!renumber || result.length < 3) {
return result;
}
point = result.indexOf('.');
if (!json && result.charAt(0) === '0' && point === 1) {
point = 0;
result = result.slice(1);
}
temp = result;
result = result.replace('e+', 'e');
exponent = 0;
if ((pos = temp.indexOf('e')) > 0) {
exponent = +temp.slice(pos + 1);
temp = temp.slice(0, pos);
}
if (point >= 0) {
exponent -= temp.length - point - 1;
temp = +(temp.slice(0, point) + temp.slice(point + 1)) + '';
}
pos = 0;
while (temp.charAt(temp.length + pos - 1) === '0') {
pos -= 1;
}
if (pos !== 0) {
exponent -= pos;
temp = temp.slice(0, pos);
}
if (exponent !== 0) {
temp += 'e' + exponent;
}
if ((temp.length < result.length ||
(hexadecimal && value > 1e12 && Math.floor(value) === value && (temp = '0x' + value.toString(16)).length < result.length)) &&
+temp === value) {
result = temp;
}
return result;
}
function escapeAllowedCharacter(ch, next) {
var code = ch.charCodeAt(0), hex = code.toString(16), result = '\\';
switch (ch) {
case '\b':
result += 'b';
break;
case '\f':
result += 'f';
break;
case '\t':
result += 't';
break;
default:
if (json || code > 0xff) {
result += 'u' + '0000'.slice(hex.length) + hex;
} else if (ch === '\u0000' && '0123456789'.indexOf(next) < 0) {
result += '0';
} else if (ch === '\v') {
result += 'v';
} else {
result += 'x' + '00'.slice(hex.length) + hex;
}
break;
}
return result;
}
function escapeDisallowedCharacter(ch) {
var result = '\\';
switch (ch) {
case '\\':
result += '\\';
break;
case '\n':
result += 'n';
break;
case '\r':
result += 'r';
break;
case '\u2028':
result += 'u2028';
break;
case '\u2029':
result += 'u2029';
break;
default:
throw new Error('Incorrectly classified character');
}
return result;
}
function escapeString(str) {
var result = '', i, len, ch, next, singleQuotes = 0, doubleQuotes = 0, single;
if (typeof str[0] === 'undefined') {
str = stringToArray(str);
}
for (i = 0, len = str.length; i < len; i += 1) {
ch = str[i];
if (ch === '\'') {
singleQuotes += 1;
} else if (ch === '"') {
doubleQuotes += 1;
} else if (ch === '/' && json) {
result += '\\';
} else if ('\\\n\r\u2028\u2029'.indexOf(ch) >= 0) {
result += escapeDisallowedCharacter(ch);
continue;
} else if ((json && ch < ' ') || !(json || escapeless || (ch >= ' ' && ch <= '~'))) {
result += escapeAllowedCharacter(ch, str[i + 1]);
continue;
}
result += ch;
}
single = !(quotes === 'double' || (quotes === 'auto' && doubleQuotes < singleQuotes));
str = result;
result = single ? '\'' : '"';
if (typeof str[0] === 'undefined') {
str = stringToArray(str);
}
for (i = 0, len = str.length; i < len; i += 1) {
ch = str[i];
if ((ch === '\'' && single) || (ch === '"' && !single)) {
result += '\\';
}
result += ch;
}
return result + (single ? '\'' : '"');
}
function isWhiteSpace(ch) {
return '\t\v\f \xa0'.indexOf(ch) >= 0 || (ch.charCodeAt(0) >= 0x1680 && '\u1680\u180e\u2000\u2001\u2002\u2003\u2004\u2005\u2006\u2007\u2008\u2009\u200a\u202f\u205f\u3000\ufeff'.indexOf(ch) >= 0);
}
function isLineTerminator(ch) {
return '\n\r\u2028\u2029'.indexOf(ch) >= 0;
}
function isIdentifierPart(ch) {
return (ch === '$') || (ch === '_') || (ch === '\\') ||
(ch >= 'a' && ch <= 'z') || (ch >= 'A' && ch <= 'Z') ||
((ch >= '0') && (ch <= '9')) ||
((ch.charCodeAt(0) >= 0x80) && Regex.NonAsciiIdentifierPart.test(ch));
}
function join(left, right) {
var leftChar = left.charAt(left.length - 1),
rightChar = right.charAt(0);
if (((leftChar === '+' || leftChar === '-') && leftChar === rightChar) || (isIdentifierPart(leftChar) && isIdentifierPart(rightChar))) {
return left + ' ' + right;
} else if (isWhiteSpace(leftChar) || isLineTerminator(leftChar) || isWhiteSpace(rightChar) || isLineTerminator(rightChar)) {
return left + right;
}
return left + space + right;
}
function addIndent(stmt) {
return base + stmt;
}
function calculateSpaces(str) {
var i;
for (i = str.length - 1; i >= 0; i -= 1) {
if (isLineTerminator(str.charAt(i))) {
break;
}
}
return (str.length - 1) - i;
}
function adjustMultilineComment(value, specialBase) {
var array, i, len, line, j, ch, spaces, previousBase;
array = value.split(/\r\n|[\r\n]/);
spaces = Number.MAX_VALUE;
// first line doesn't have indentation
for (i = 1, len = array.length; i < len; i += 1) {
line = array[i];
j = 0;
while (j < line.length && isWhiteSpace(line[j])) {
j += 1;
}
if (spaces > j) {
spaces = j;
}
}
if (typeof specialBase !== 'undefined') {
// pattern like
// {
// var t = 20; /*
// * this is comment
// */
// }
previousBase = base;
if (array[1][spaces] === '*') {
specialBase += ' ';
}
base = specialBase;
} else {
if (spaces % 2 === 1) {
// /*
// *
// */
// If spaces are odd number, above pattern is considered.
// We waste 1 space.
spaces -= 1;
}
previousBase = base;
}
for (i = 1, len = array.length; i < len; i += 1) {
array[i] = addIndent(array[i].slice(spaces));
}
base = previousBase;
return array.join('\n');
}
function generateComment(comment, specialBase) {
if (comment.type === 'Line') {
if (endsWithLineTerminator(comment.value)) {
return '//' + comment.value;
} else {
// Always use LineTerminator
return '//' + comment.value + '\n';
}
}
if (extra.format.indent.adjustMultilineComment && /[\n\r]/.test(comment.value)) {
return adjustMultilineComment('/*' + comment.value + '*/', specialBase);
}
return '/*' + comment.value + '*/';
}
function addCommentsToStatement(stmt, result) {
var i, len, comment, save, node, tailingToStatement, specialBase, fragment;
if (stmt.leadingComments) {
save = result;
comment = stmt.leadingComments[0];
result = generateComment(comment);
if (!endsWithLineTerminator(result)) {
result += '\n';
}
for (i = 1, len = stmt.leadingComments.length; i < len; i += 1) {
comment = stmt.leadingComments[i];
fragment = generateComment(comment);
if (!endsWithLineTerminator(fragment)) {
fragment += '\n';
}
result += addIndent(fragment);
}
result += addIndent(save);
}
if (stmt.trailingComments) {
tailingToStatement = !endsWithLineTerminator(result);
specialBase = stringRepeat(' ', calculateSpaces(base + result + indent));
for (i = 0, len = stmt.trailingComments.length; i < len; i += 1) {
comment = stmt.trailingComments[i];
if (tailingToStatement) {
// We assume target like following script
//
// var t = 20; /**
// * This is comment of t
// */
if (i === 0) {
// first case
result += indent;
} else {
result += specialBase;
}
result += generateComment(comment, specialBase);
} else {
result += addIndent(generateComment(comment));
}
if (i !== len - 1 && !endsWithLineTerminator(result)) {
result += '\n';
}
}
}
return result;
}
function parenthesize(text, current, should) {
if (current < should) {
return '(' + text + ')';
}
return text;
}
function maybeBlock(stmt, semicolonOptional) {
var previousBase, result, noLeadingComment;
noLeadingComment = !extra.comment || !stmt.leadingComments;
if (stmt.type === Syntax.BlockStatement && noLeadingComment) {
return space + generateStatement(stmt);
}
if (stmt.type === Syntax.EmptyStatement && noLeadingComment) {
return ';';
}
previousBase = base;
base += indent;
result = newline + addIndent(generateStatement(stmt, { semicolonOptional: semicolonOptional }));
base = previousBase;
return result;
}
function maybeBlockSuffix(stmt, result) {
if (stmt.type === Syntax.BlockStatement && (!extra.comment || !stmt.leadingComments) && !endsWithLineTerminator(result)) {
return space;
}
if (endsWithLineTerminator(result)) {
return addIndent('');
}
return (newline === '' ? ' ' : newline) + addIndent('');
}
function generateFunctionBody(node) {
var result, i, len;
result = '(';
for (i = 0, len = node.params.length; i < len; i += 1) {
result += node.params[i].name;
if (i + 1 < len) {
result += ',' + space;
}
}
return result + ')' + maybeBlock(node.body);
}
function generateExpression(expr, option) {
var result, precedence, currentPrecedence, previousBase, i, len, raw, fragment, allowIn, allowCall, allowUnparenthesizedNew;
precedence = option.precedence;
allowIn = option.allowIn;
allowCall = option.allowCall;
switch (expr.type) {
case Syntax.SequenceExpression:
result = '';
allowIn |= (Precedence.Sequence < precedence);
for (i = 0, len = expr.expressions.length; i < len; i += 1) {
result += generateExpression(expr.expressions[i], {
precedence: Precedence.Assignment,
allowIn: allowIn,
allowCall: true
});
if (i + 1 < len) {
result += ',' + space;
}
}
result = parenthesize(result, Precedence.Sequence, precedence);
break;
case Syntax.AssignmentExpression:
allowIn |= (Precedence.Assignment < precedence);
result = parenthesize(
generateExpression(expr.left, {
precedence: Precedence.Call,
allowIn: allowIn,
allowCall: true
}) + space + expr.operator + space +
generateExpression(expr.right, {
precedence: Precedence.Assignment,
allowIn: allowIn,
allowCall: true
}),
Precedence.Assignment,
precedence
);
break;
case Syntax.ConditionalExpression:
allowIn |= (Precedence.Conditional < precedence);
result = parenthesize(
generateExpression(expr.test, {
precedence: Precedence.LogicalOR,
allowIn: allowIn,
allowCall: true
}) + space + '?' + space +
generateExpression(expr.consequent, {
precedence: Precedence.Assignment,
allowIn: allowIn,
allowCall: true
}) + space + ':' + space +
generateExpression(expr.alternate, {
precedence: Precedence.Assignment,
allowIn: allowIn,
allowCall: true
}),
Precedence.Conditional,
precedence
);
break;
case Syntax.LogicalExpression:
case Syntax.BinaryExpression:
currentPrecedence = BinaryPrecedence[expr.operator];
allowIn |= (currentPrecedence < precedence);
result = join(
generateExpression(expr.left, {
precedence: currentPrecedence,
allowIn: allowIn,
allowCall: true
}),
expr.operator
);
fragment = generateExpression(expr.right, {
precedence: currentPrecedence + 1,
allowIn: allowIn,
allowCall: true
});
if (expr.operator === '/' && result.charAt(result.length - 1) === '/') {
// If '/' concats with '/', it is interpreted as comment start
result += ' ' + fragment;
} else {
result = join(result, fragment);
}
if (expr.operator === 'in' && !allowIn) {
result = '(' + result + ')';
} else {
result = parenthesize(result, currentPrecedence, precedence);
}
break;
case Syntax.CallExpression:
result = generateExpression(expr.callee, {
precedence: Precedence.Call,
allowIn: true,
allowCall: true,
allowUnparenthesizedNew: false
});
result += '(';
for (i = 0, len = expr['arguments'].length; i < len; i += 1) {
result += generateExpression(expr['arguments'][i], {
precedence: Precedence.Assignment,
allowIn: true,
allowCall: true
});
if (i + 1 < len) {
result += ',' + space;
}
}
result += ')';
if (!allowCall) {
result = '(' + result + ')';
} else {
result = parenthesize(result, Precedence.Call, precedence);
}
break;
case Syntax.NewExpression:
len = expr['arguments'].length;
allowUnparenthesizedNew = option.allowUnparenthesizedNew === undefined || option.allowUnparenthesizedNew;
result = join(
'new',
generateExpression(expr.callee, {
precedence: Precedence.New,
allowIn: true,
allowCall: false,
allowUnparenthesizedNew: allowUnparenthesizedNew && !parentheses && len === 0
})
);
if (!allowUnparenthesizedNew || parentheses || len > 0) {
result += '(';
for (i = 0; i < len; i += 1) {
result += generateExpression(expr['arguments'][i], {
precedence: Precedence.Assignment,
allowIn: true,
allowCall: true
});
if (i + 1 < len) {
result += ',' + space;
}
}
result += ')';
}
result = parenthesize(result, Precedence.New, precedence);
break;
case Syntax.MemberExpression:
result = generateExpression(expr.object, {
precedence: Precedence.Call,
allowIn: true,
allowCall: allowCall,
allowUnparenthesizedNew: false
});
if (expr.computed) {
result += '[' + generateExpression(expr.property, {
precedence: Precedence.Sequence,
allowIn: true,
allowCall: allowCall
}) + ']';
} else {
if (expr.object.type === Syntax.Literal && typeof expr.object.value === 'number') {
if (result.indexOf('.') < 0) {
if (!/[eExX]/.test(result) && !(result.length >= 2 && result[0] === '0')) {
result += '.';
}
}
}
result += '.' + expr.property.name;
}
result = parenthesize(result, Precedence.Member, precedence);
break;
case Syntax.UnaryExpression:
fragment = generateExpression(expr.argument, {
precedence: Precedence.Unary + (
expr.argument.type === Syntax.UnaryExpression &&
expr.operator.length < 3 &&
expr.argument.operator === expr.operator ? 1 : 0
),
allowIn: true,
allowCall: true
});
if (space === '') {
result = join(expr.operator, fragment);
} else {
result = expr.operator;
if (result.length > 2) {
result += ' ';
}
result += fragment;
}
result = parenthesize(result, Precedence.Unary, precedence);
break;
case Syntax.UpdateExpression:
if (expr.prefix) {
result = parenthesize(
expr.operator +
generateExpression(expr.argument, {
precedence: Precedence.Unary,
allowIn: true,
allowCall: true
}),
Precedence.Unary,
precedence
);
} else {
result = parenthesize(
generateExpression(expr.argument, {
precedence: Precedence.Postfix,
allowIn: true,
allowCall: true
}) + expr.operator,
Precedence.Postfix,
precedence
);
}
break;
case Syntax.FunctionExpression:
result = 'function';
if (expr.id) {
result += ' ' + expr.id.name;
} else {
result += space;
}
result += generateFunctionBody(expr);
break;
case Syntax.ArrayExpression:
if (!expr.elements.length) {
result = '[]';
break;
}
result = '[' + newline;
previousBase = base;
base += indent;
for (i = 0, len = expr.elements.length; i < len; i += 1) {
if (!expr.elements[i]) {
result += addIndent('');
if (i + 1 === len) {
result += ',';
}
} else {
result += addIndent(generateExpression(expr.elements[i], {
precedence: Precedence.Assignment,
allowIn: true,
allowCall: true
}));
}
if (i + 1 < len) {
result += ',' + newline;
}
}
base = previousBase;
if (!endsWithLineTerminator(result)) {
result += newline;
}
result += addIndent(']');
break;
case Syntax.Property:
if (expr.kind === 'get' || expr.kind === 'set') {
result = expr.kind + ' ' + generateExpression(expr.key, {
precedence: Precedence.Sequence,
allowIn: true,
allowCall: true
}) + generateFunctionBody(expr.value);
} else {
result =
generateExpression(expr.key, {
precedence: Precedence.Sequence,
allowIn: true,
allowCall: true
}) + ':' + space + generateExpression(expr.value, {
precedence: Precedence.Assignment,
allowIn: true,
allowCall: true
});
}
break;
case Syntax.ObjectExpression:
if (!expr.properties.length) {
result = '{}';
break;
}
result = '{' + newline;
previousBase = base;
base += indent;
for (i = 0, len = expr.properties.length; i < len; i += 1) {
result += addIndent(generateExpression(expr.properties[i], {
precedence: Precedence.Sequence,
allowIn: true,
allowCall: true
}));
if (i + 1 < len) {
result += ',' + newline;
}
}
base = previousBase;
if (!endsWithLineTerminator(result)) {
result += newline;
}
result += addIndent('}');
break;
case Syntax.ThisExpression:
result = 'this';
break;
case Syntax.Identifier:
result = expr.name;
break;
case Syntax.Literal:
if (expr.hasOwnProperty('raw') && parse) {
try {
raw = parse(expr.raw).body[0].expression;
if (raw.type === Syntax.Literal) {
if (raw.value === expr.value) {
result = expr.raw;
break;
}
}
} catch (e) {
// not use raw property
}
}
if (expr.value === null) {
result = 'null';
break;
}
if (typeof expr.value === 'string') {
result = escapeString(expr.value);
break;
}
if (typeof expr.value === 'number') {
result = generateNumber(expr.value);
break;
}
result = expr.value.toString();
break;
default:
break;
}
if (result === undefined) {
throw new Error('Unknown expression type: ' + expr.type);