329 lines
11 KiB
JavaScript
329 lines
11 KiB
JavaScript
|
/***********************************************************************
|
||
|
|
|
||
|
|
A JavaScript tokenizer / parser / beautifier / compressor.
|
||
|
|
https://github.com/mishoo/UglifyJS
|
||
|
|
|
||
|
|
-------------------------------- (C) ---------------------------------
|
||
|
|
|
||
|
|
Author: Mihai Bazon
|
||
|
|
<mihai.bazon@gmail.com>
|
||
|
|
http://mihai.bazon.net/blog
|
||
|
|
|
||
|
|
Distributed under the BSD license:
|
||
|
|
|
||
|
|
Copyright 2012 (c) Mihai Bazon <mihai.bazon@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 HOLDER “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 THE 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.
|
||
|
|
|
||
|
|
***********************************************************************/
|
||
|
|
|
||
|
|
"use strict";
|
||
|
|
|
||
|
|
function get_builtins() {
|
||
|
|
var names = new Dictionary();
|
||
|
|
// constants
|
||
|
|
[
|
||
|
|
"NaN",
|
||
|
|
"null",
|
||
|
|
"true",
|
||
|
|
"false",
|
||
|
|
"Infinity",
|
||
|
|
"-Infinity",
|
||
|
|
"undefined",
|
||
|
|
].forEach(add);
|
||
|
|
// global functions
|
||
|
|
[
|
||
|
|
"encodeURI",
|
||
|
|
"encodeURIComponent",
|
||
|
|
"escape",
|
||
|
|
"eval",
|
||
|
|
"decodeURI",
|
||
|
|
"decodeURIComponent",
|
||
|
|
"isFinite",
|
||
|
|
"isNaN",
|
||
|
|
"parseFloat",
|
||
|
|
"parseInt",
|
||
|
|
"unescape",
|
||
|
|
].forEach(add);
|
||
|
|
// global constructors & objects
|
||
|
|
var global = Function("return this")();
|
||
|
|
[
|
||
|
|
"Array",
|
||
|
|
"ArrayBuffer",
|
||
|
|
"Atomics",
|
||
|
|
"BigInt",
|
||
|
|
"Boolean",
|
||
|
|
"console",
|
||
|
|
"DataView",
|
||
|
|
"Date",
|
||
|
|
"Error",
|
||
|
|
"Function",
|
||
|
|
"Int8Array",
|
||
|
|
"Intl",
|
||
|
|
"JSON",
|
||
|
|
"Map",
|
||
|
|
"Math",
|
||
|
|
"Number",
|
||
|
|
"Object",
|
||
|
|
"Promise",
|
||
|
|
"Proxy",
|
||
|
|
"Reflect",
|
||
|
|
"RegExp",
|
||
|
|
"Set",
|
||
|
|
"String",
|
||
|
|
"Symbol",
|
||
|
|
"WebAssembly",
|
||
|
|
].forEach(function(name) {
|
||
|
|
add(name);
|
||
|
|
var ctor = global[name];
|
||
|
|
if (!ctor) return;
|
||
|
|
Object.getOwnPropertyNames(ctor).map(add);
|
||
|
|
if (typeof ctor != "function") return;
|
||
|
|
if (ctor.__proto__) Object.getOwnPropertyNames(ctor.__proto__).map(add);
|
||
|
|
if (ctor.prototype) Object.getOwnPropertyNames(ctor.prototype).map(add);
|
||
|
|
try {
|
||
|
|
Object.getOwnPropertyNames(new ctor()).map(add);
|
||
|
|
} catch (e) {
|
||
|
|
try {
|
||
|
|
Object.getOwnPropertyNames(ctor()).map(add);
|
||
|
|
} catch (e) {}
|
||
|
|
}
|
||
|
|
});
|
||
|
|
return (get_builtins = function() {
|
||
|
|
return names.clone();
|
||
|
|
})();
|
||
|
|
|
||
|
|
function add(name) {
|
||
|
|
names.set(name, true);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
function reserve_quoted_keys(ast, reserved) {
|
||
|
|
ast.walk(new TreeWalker(function(node) {
|
||
|
|
if (node instanceof AST_ClassProperty
|
||
|
|
|| node instanceof AST_DestructuredKeyVal
|
||
|
|
|| node instanceof AST_ObjectProperty) {
|
||
|
|
if (node.key instanceof AST_Node) {
|
||
|
|
addStrings(node.key, add);
|
||
|
|
} else if (node.start && node.start.quote) {
|
||
|
|
add(node.key);
|
||
|
|
}
|
||
|
|
} else if (node instanceof AST_Dot) {
|
||
|
|
if (node.quoted) add(node.property);
|
||
|
|
} else if (node instanceof AST_Sub) {
|
||
|
|
addStrings(node.property, add);
|
||
|
|
}
|
||
|
|
}));
|
||
|
|
|
||
|
|
function add(name) {
|
||
|
|
push_uniq(reserved, name);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
function addStrings(node, add) {
|
||
|
|
if (node instanceof AST_Conditional) {
|
||
|
|
addStrings(node.consequent, add);
|
||
|
|
addStrings(node.alternative, add);
|
||
|
|
} else if (node instanceof AST_Sequence) {
|
||
|
|
addStrings(node.tail_node(), add);
|
||
|
|
} else if (node instanceof AST_String) {
|
||
|
|
add(node.value);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
function mangle_properties(ast, options) {
|
||
|
|
options = defaults(options, {
|
||
|
|
builtins: false,
|
||
|
|
cache: null,
|
||
|
|
debug: false,
|
||
|
|
domprops: false,
|
||
|
|
keep_quoted: false,
|
||
|
|
regex: null,
|
||
|
|
reserved: null,
|
||
|
|
}, true);
|
||
|
|
|
||
|
|
var reserved = options.builtins ? new Dictionary() : get_builtins();
|
||
|
|
if (!options.domprops && typeof domprops !== "undefined") domprops.forEach(function(name) {
|
||
|
|
reserved.set(name, true);
|
||
|
|
});
|
||
|
|
if (Array.isArray(options.reserved)) options.reserved.forEach(function(name) {
|
||
|
|
reserved.set(name, true);
|
||
|
|
});
|
||
|
|
|
||
|
|
var cname = -1;
|
||
|
|
var cache;
|
||
|
|
if (options.cache) {
|
||
|
|
cache = options.cache.props;
|
||
|
|
cache.each(function(name) {
|
||
|
|
reserved.set(name, true);
|
||
|
|
});
|
||
|
|
} else {
|
||
|
|
cache = new Dictionary();
|
||
|
|
}
|
||
|
|
|
||
|
|
var regex = options.regex;
|
||
|
|
|
||
|
|
// note debug is either false (disabled), or a string of the debug suffix to use (enabled).
|
||
|
|
// note debug may be enabled as an empty string, which is falsy. Also treat passing 'true'
|
||
|
|
// the same as passing an empty string.
|
||
|
|
var debug = options.debug !== false;
|
||
|
|
var debug_suffix;
|
||
|
|
if (debug) debug_suffix = options.debug === true ? "" : options.debug;
|
||
|
|
|
||
|
|
var names_to_mangle = new Dictionary();
|
||
|
|
var unmangleable = reserved.clone();
|
||
|
|
|
||
|
|
// step 1: find candidates to mangle
|
||
|
|
ast.walk(new TreeWalker(function(node) {
|
||
|
|
if (node.TYPE == "Call") {
|
||
|
|
var exp = node.expression;
|
||
|
|
if (exp instanceof AST_Dot) switch (exp.property) {
|
||
|
|
case "defineProperty":
|
||
|
|
case "getOwnPropertyDescriptor":
|
||
|
|
if (node.args.length < 2) break;
|
||
|
|
exp = exp.expression;
|
||
|
|
if (!(exp instanceof AST_SymbolRef)) break;
|
||
|
|
if (exp.name != "Object") break;
|
||
|
|
if (!exp.definition().undeclared) break;
|
||
|
|
addStrings(node.args[1], add);
|
||
|
|
break;
|
||
|
|
case "hasOwnProperty":
|
||
|
|
if (node.args.length < 1) break;
|
||
|
|
addStrings(node.args[0], add);
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
} else if (node instanceof AST_ClassProperty
|
||
|
|
|| node instanceof AST_DestructuredKeyVal
|
||
|
|
|| node instanceof AST_ObjectProperty) {
|
||
|
|
if (node.key instanceof AST_Node) {
|
||
|
|
addStrings(node.key, add);
|
||
|
|
} else {
|
||
|
|
add(node.key);
|
||
|
|
}
|
||
|
|
} else if (node instanceof AST_Dot) {
|
||
|
|
if (is_lhs(node, this.parent())) add(node.property);
|
||
|
|
} else if (node instanceof AST_Sub) {
|
||
|
|
if (is_lhs(node, this.parent())) addStrings(node.property, add);
|
||
|
|
}
|
||
|
|
}));
|
||
|
|
|
||
|
|
// step 2: renaming properties
|
||
|
|
ast.walk(new TreeWalker(function(node) {
|
||
|
|
if (node instanceof AST_Binary) {
|
||
|
|
if (node.operator == "in") mangleStrings(node.left);
|
||
|
|
} else if (node.TYPE == "Call") {
|
||
|
|
var exp = node.expression;
|
||
|
|
if (exp instanceof AST_Dot) switch (exp.property) {
|
||
|
|
case "defineProperty":
|
||
|
|
case "getOwnPropertyDescriptor":
|
||
|
|
if (node.args.length < 2) break;
|
||
|
|
exp = exp.expression;
|
||
|
|
if (!(exp instanceof AST_SymbolRef)) break;
|
||
|
|
if (exp.name != "Object") break;
|
||
|
|
if (!exp.definition().undeclared) break;
|
||
|
|
mangleStrings(node.args[1]);
|
||
|
|
break;
|
||
|
|
case "hasOwnProperty":
|
||
|
|
if (node.args.length < 1) break;
|
||
|
|
mangleStrings(node.args[0]);
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
} else if (node instanceof AST_ClassProperty
|
||
|
|
|| node instanceof AST_DestructuredKeyVal
|
||
|
|
|| node instanceof AST_ObjectProperty) {
|
||
|
|
if (node.key instanceof AST_Node) {
|
||
|
|
mangleStrings(node.key);
|
||
|
|
} else {
|
||
|
|
node.key = mangle(node.key);
|
||
|
|
}
|
||
|
|
} else if (node instanceof AST_Dot) {
|
||
|
|
node.property = mangle(node.property);
|
||
|
|
} else if (node instanceof AST_Sub) {
|
||
|
|
if (!options.keep_quoted) mangleStrings(node.property);
|
||
|
|
}
|
||
|
|
}));
|
||
|
|
|
||
|
|
// only function declarations after this line
|
||
|
|
|
||
|
|
function can_mangle(name) {
|
||
|
|
if (unmangleable.has(name)) return false;
|
||
|
|
if (/^-?[0-9]+(\.[0-9]+)?(e[+-][0-9]+)?$/.test(name)) return false;
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
|
||
|
|
function should_mangle(name) {
|
||
|
|
if (reserved.has(name)) {
|
||
|
|
AST_Node.info("Preserving reserved property {this}", name);
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
if (regex && !regex.test(name)) {
|
||
|
|
AST_Node.info("Preserving excluded property {this}", name);
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
return cache.has(name) || names_to_mangle.has(name);
|
||
|
|
}
|
||
|
|
|
||
|
|
function add(name) {
|
||
|
|
if (can_mangle(name)) names_to_mangle.set(name, true);
|
||
|
|
if (!should_mangle(name)) unmangleable.set(name, true);
|
||
|
|
}
|
||
|
|
|
||
|
|
function mangle(name) {
|
||
|
|
if (!should_mangle(name)) return name;
|
||
|
|
var mangled = cache.get(name);
|
||
|
|
if (!mangled) {
|
||
|
|
if (debug) {
|
||
|
|
// debug mode: use a prefix and suffix to preserve readability, e.g. o.foo ---> o._$foo$NNN_.
|
||
|
|
var debug_mangled = "_$" + name + "$" + debug_suffix + "_";
|
||
|
|
if (can_mangle(debug_mangled)) mangled = debug_mangled;
|
||
|
|
}
|
||
|
|
// either debug mode is off, or it is on and we could not use the mangled name
|
||
|
|
if (!mangled) do {
|
||
|
|
mangled = base54(++cname);
|
||
|
|
} while (!can_mangle(mangled));
|
||
|
|
if (/^#/.test(name)) mangled = "#" + mangled;
|
||
|
|
cache.set(name, mangled);
|
||
|
|
}
|
||
|
|
AST_Node.info("Mapping property {name} to {mangled}", {
|
||
|
|
mangled: mangled,
|
||
|
|
name: name,
|
||
|
|
});
|
||
|
|
return mangled;
|
||
|
|
}
|
||
|
|
|
||
|
|
function mangleStrings(node) {
|
||
|
|
if (node instanceof AST_Sequence) {
|
||
|
|
mangleStrings(node.tail_node());
|
||
|
|
} else if (node instanceof AST_String) {
|
||
|
|
node.value = mangle(node.value);
|
||
|
|
} else if (node instanceof AST_Conditional) {
|
||
|
|
mangleStrings(node.consequent);
|
||
|
|
mangleStrings(node.alternative);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|