433 lines
14 KiB
JavaScript
433 lines
14 KiB
JavaScript
/***********************************************************************
|
|
|
|
A JavaScript tokenizer / parser / beautifier / compressor.
|
|
https://github.com/mishoo/UglifyJS2
|
|
|
|
-------------------------------- (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";
|
|
/* global global, self */
|
|
|
|
import {
|
|
defaults,
|
|
push_uniq,
|
|
has_annotation,
|
|
clear_annotation,
|
|
} from "./utils/index.js";
|
|
import { base54 } from "./scope.js";
|
|
import {
|
|
AST_Binary,
|
|
AST_Call,
|
|
AST_ClassPrivateProperty,
|
|
AST_Conditional,
|
|
AST_Dot,
|
|
AST_DotHash,
|
|
AST_ObjectKeyVal,
|
|
AST_ObjectProperty,
|
|
AST_PrivateMethod,
|
|
AST_PrivateGetter,
|
|
AST_PrivateSetter,
|
|
AST_PrivateIn,
|
|
AST_Sequence,
|
|
AST_String,
|
|
AST_Sub,
|
|
TreeTransformer,
|
|
TreeWalker,
|
|
_KEY,
|
|
_MANGLEPROP,
|
|
|
|
walk,
|
|
} from "./ast.js";
|
|
import { domprops } from "../tools/domprops.js";
|
|
|
|
function find_builtins(reserved) {
|
|
domprops.forEach(add);
|
|
|
|
// Compatibility fix for some standard defined globals not defined on every js environment
|
|
var new_globals = ["Symbol", "Map", "Promise", "Proxy", "Reflect", "Set", "WeakMap", "WeakSet"];
|
|
var objects = {};
|
|
var global_ref = typeof global === "object" ? global : self;
|
|
|
|
new_globals.forEach(function (new_global) {
|
|
objects[new_global] = global_ref[new_global] || function() {};
|
|
});
|
|
|
|
[
|
|
"null",
|
|
"true",
|
|
"false",
|
|
"NaN",
|
|
"Infinity",
|
|
"-Infinity",
|
|
"undefined",
|
|
].forEach(add);
|
|
[ Object, Array, Function, Number,
|
|
String, Boolean, Error, Math,
|
|
Date, RegExp, objects.Symbol, ArrayBuffer,
|
|
DataView, decodeURI, decodeURIComponent,
|
|
encodeURI, encodeURIComponent, eval, EvalError,
|
|
Float32Array, Float64Array, Int8Array, Int16Array,
|
|
Int32Array, isFinite, isNaN, JSON, objects.Map, parseFloat,
|
|
parseInt, objects.Promise, objects.Proxy, RangeError, ReferenceError,
|
|
objects.Reflect, objects.Set, SyntaxError, TypeError, Uint8Array,
|
|
Uint8ClampedArray, Uint16Array, Uint32Array, URIError,
|
|
objects.WeakMap, objects.WeakSet
|
|
].forEach(function(ctor) {
|
|
Object.getOwnPropertyNames(ctor).map(add);
|
|
if (ctor.prototype) {
|
|
Object.getOwnPropertyNames(ctor.prototype).map(add);
|
|
}
|
|
});
|
|
function add(name) {
|
|
reserved.add(name);
|
|
}
|
|
}
|
|
|
|
function reserve_quoted_keys(ast, reserved) {
|
|
function add(name) {
|
|
push_uniq(reserved, name);
|
|
}
|
|
|
|
ast.walk(new TreeWalker(function(node) {
|
|
if (node instanceof AST_ObjectKeyVal && node.quote) {
|
|
add(node.key);
|
|
} else if (node instanceof AST_ObjectProperty && node.quote) {
|
|
add(node.key.name);
|
|
} else if (node instanceof AST_Sub) {
|
|
addStrings(node.property, add);
|
|
}
|
|
}));
|
|
}
|
|
|
|
function addStrings(node, add) {
|
|
node.walk(new TreeWalker(function(node) {
|
|
if (node instanceof AST_Sequence) {
|
|
addStrings(node.tail_node(), add);
|
|
} else if (node instanceof AST_String) {
|
|
add(node.value);
|
|
} else if (node instanceof AST_Conditional) {
|
|
addStrings(node.consequent, add);
|
|
addStrings(node.alternative, add);
|
|
}
|
|
return true;
|
|
}));
|
|
}
|
|
|
|
function mangle_private_properties(ast, options) {
|
|
var cprivate = -1;
|
|
var private_cache = new Map();
|
|
var nth_identifier = options.nth_identifier || base54;
|
|
|
|
ast = ast.transform(new TreeTransformer(function(node) {
|
|
if (
|
|
node instanceof AST_ClassPrivateProperty
|
|
|| node instanceof AST_PrivateMethod
|
|
|| node instanceof AST_PrivateGetter
|
|
|| node instanceof AST_PrivateSetter
|
|
|| node instanceof AST_PrivateIn
|
|
) {
|
|
node.key.name = mangle_private(node.key.name);
|
|
} else if (node instanceof AST_DotHash) {
|
|
node.property = mangle_private(node.property);
|
|
}
|
|
}));
|
|
return ast;
|
|
|
|
function mangle_private(name) {
|
|
let mangled = private_cache.get(name);
|
|
if (!mangled) {
|
|
mangled = nth_identifier.get(++cprivate);
|
|
private_cache.set(name, mangled);
|
|
}
|
|
|
|
return mangled;
|
|
}
|
|
}
|
|
|
|
function find_annotated_props(ast) {
|
|
var annotated_props = new Set();
|
|
walk(ast, node => {
|
|
if (
|
|
node instanceof AST_ClassPrivateProperty
|
|
|| node instanceof AST_PrivateMethod
|
|
|| node instanceof AST_PrivateGetter
|
|
|| node instanceof AST_PrivateSetter
|
|
|| node instanceof AST_DotHash
|
|
) {
|
|
// handled by mangle_private_properties
|
|
} else if (node instanceof AST_ObjectKeyVal) {
|
|
if (typeof node.key == "string" && has_annotation(node, _MANGLEPROP)) {
|
|
annotated_props.add(node.key);
|
|
}
|
|
} else if (node instanceof AST_ObjectProperty) {
|
|
// setter or getter, since KeyVal is handled above
|
|
if (has_annotation(node, _MANGLEPROP)) {
|
|
annotated_props.add(node.key.name);
|
|
}
|
|
} else if (node instanceof AST_Dot) {
|
|
if (has_annotation(node, _MANGLEPROP)) {
|
|
annotated_props.add(node.property);
|
|
}
|
|
} else if (node instanceof AST_Sub) {
|
|
if (node.property instanceof AST_String && has_annotation(node, _MANGLEPROP)) {
|
|
annotated_props.add(node.property.value);
|
|
}
|
|
}
|
|
});
|
|
return annotated_props;
|
|
}
|
|
|
|
function mangle_properties(ast, options, annotated_props = find_annotated_props(ast)) {
|
|
options = defaults(options, {
|
|
builtins: false,
|
|
cache: null,
|
|
debug: false,
|
|
keep_quoted: false,
|
|
nth_identifier: base54,
|
|
only_cache: false,
|
|
regex: null,
|
|
reserved: null,
|
|
undeclared: false,
|
|
only_annotated: false,
|
|
}, true);
|
|
|
|
var nth_identifier = options.nth_identifier;
|
|
|
|
var reserved_option = options.reserved;
|
|
if (!Array.isArray(reserved_option)) reserved_option = [reserved_option];
|
|
var reserved = new Set(reserved_option);
|
|
if (!options.builtins) find_builtins(reserved);
|
|
|
|
var cname = -1;
|
|
|
|
var cache;
|
|
if (options.cache) {
|
|
cache = options.cache.props;
|
|
} else {
|
|
cache = new Map();
|
|
}
|
|
|
|
var only_annotated = options.only_annotated;
|
|
var regex = options.regex && new RegExp(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 falsey. Also treat passing 'true'
|
|
// the same as passing an empty string.
|
|
var debug = options.debug !== false;
|
|
var debug_name_suffix;
|
|
if (debug) {
|
|
debug_name_suffix = (options.debug === true ? "" : options.debug);
|
|
}
|
|
|
|
var names_to_mangle = new Set();
|
|
var unmangleable = new Set();
|
|
// Track each already-mangled name to prevent nth_identifier from generating
|
|
// the same name.
|
|
cache.forEach((mangled_name) => unmangleable.add(mangled_name));
|
|
|
|
var keep_quoted = !!options.keep_quoted;
|
|
|
|
// step 1: find candidates to mangle
|
|
ast.walk(new TreeWalker(function(node) {
|
|
if (
|
|
node instanceof AST_ClassPrivateProperty
|
|
|| node instanceof AST_PrivateMethod
|
|
|| node instanceof AST_PrivateGetter
|
|
|| node instanceof AST_PrivateSetter
|
|
|| node instanceof AST_DotHash
|
|
) {
|
|
// handled by mangle_private_properties
|
|
} else if (node instanceof AST_ObjectKeyVal) {
|
|
if (typeof node.key == "string" && (!keep_quoted || !node.quote)) {
|
|
add(node.key);
|
|
}
|
|
} else if (node instanceof AST_ObjectProperty) {
|
|
// setter or getter, since KeyVal is handled above
|
|
if (!keep_quoted || !node.quote) {
|
|
add(node.key.name);
|
|
}
|
|
} else if (node instanceof AST_Dot) {
|
|
var declared = !!options.undeclared;
|
|
if (!declared) {
|
|
var root = node;
|
|
while (root.expression) {
|
|
root = root.expression;
|
|
}
|
|
declared = !(root.thedef && root.thedef.undeclared);
|
|
}
|
|
if (declared &&
|
|
(!keep_quoted || !node.quote)) {
|
|
add(node.property);
|
|
}
|
|
} else if (node instanceof AST_Sub) {
|
|
if (!keep_quoted) {
|
|
addStrings(node.property, add);
|
|
}
|
|
} else if (node instanceof AST_Call
|
|
&& node.expression.print_to_string() == "Object.defineProperty") {
|
|
addStrings(node.args[1], add);
|
|
} else if (node instanceof AST_Binary && node.operator === "in") {
|
|
addStrings(node.left, add);
|
|
} else if (node instanceof AST_String && has_annotation(node, _KEY)) {
|
|
add(node.value);
|
|
}
|
|
}));
|
|
|
|
// step 2: transform the tree, renaming properties
|
|
return ast.transform(new TreeTransformer(function(node) {
|
|
if (
|
|
node instanceof AST_ClassPrivateProperty
|
|
|| node instanceof AST_PrivateMethod
|
|
|| node instanceof AST_PrivateGetter
|
|
|| node instanceof AST_PrivateSetter
|
|
|| node instanceof AST_DotHash
|
|
) {
|
|
// handled by mangle_private_properties
|
|
} else if (node instanceof AST_ObjectKeyVal) {
|
|
if (typeof node.key == "string" && (!keep_quoted || !node.quote)) {
|
|
node.key = mangle(node.key);
|
|
}
|
|
} else if (node instanceof AST_ObjectProperty) {
|
|
// setter, getter, method or class field
|
|
if (!keep_quoted || !node.quote) {
|
|
node.key.name = mangle(node.key.name);
|
|
}
|
|
} else if (node instanceof AST_Dot) {
|
|
if (!keep_quoted || !node.quote) {
|
|
node.property = mangle(node.property);
|
|
}
|
|
} else if (!keep_quoted && node instanceof AST_Sub) {
|
|
node.property = mangleStrings(node.property);
|
|
} else if (node instanceof AST_Call
|
|
&& node.expression.print_to_string() == "Object.defineProperty") {
|
|
node.args[1] = mangleStrings(node.args[1]);
|
|
} else if (node instanceof AST_Binary && node.operator === "in") {
|
|
node.left = mangleStrings(node.left);
|
|
} else if (node instanceof AST_String && has_annotation(node, _KEY)) {
|
|
// Clear _KEY annotation to prevent double mangling
|
|
clear_annotation(node, _KEY);
|
|
node.value = mangle(node.value);
|
|
}
|
|
}));
|
|
|
|
// only function declarations after this line
|
|
|
|
function can_mangle(name) {
|
|
if (unmangleable.has(name)) return false;
|
|
if (reserved.has(name)) return false;
|
|
if (options.only_cache) {
|
|
return cache.has(name);
|
|
}
|
|
if (/^-?[0-9]+(\.[0-9]+)?(e[+-][0-9]+)?$/.test(name)) return false;
|
|
return true;
|
|
}
|
|
|
|
function should_mangle(name) {
|
|
if (only_annotated && !annotated_props.has(name)) return false;
|
|
if (regex && !regex.test(name)) {
|
|
return annotated_props.has(name);
|
|
}
|
|
if (reserved.has(name)) return false;
|
|
return cache.has(name)
|
|
|| names_to_mangle.has(name);
|
|
}
|
|
|
|
function add(name) {
|
|
if (can_mangle(name)) {
|
|
names_to_mangle.add(name);
|
|
}
|
|
|
|
if (!should_mangle(name)) {
|
|
unmangleable.add(name);
|
|
}
|
|
}
|
|
|
|
function mangle(name) {
|
|
if (!should_mangle(name)) {
|
|
return name;
|
|
}
|
|
|
|
var mangled = cache.get(name);
|
|
if (!mangled) {
|
|
if (debug) {
|
|
// debug mode: use a prefix and suffix to preserve readability, e.g. o.foo -> o._$foo$NNN_.
|
|
var debug_mangled = "_$" + name + "$" + debug_name_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 = nth_identifier.get(++cname);
|
|
} while (!can_mangle(mangled));
|
|
}
|
|
|
|
cache.set(name, mangled);
|
|
}
|
|
return mangled;
|
|
}
|
|
|
|
function mangleStrings(node) {
|
|
return node.transform(new TreeTransformer(function(node) {
|
|
if (node instanceof AST_Sequence) {
|
|
var last = node.expressions.length - 1;
|
|
node.expressions[last] = mangleStrings(node.expressions[last]);
|
|
} else if (node instanceof AST_String) {
|
|
// Clear _KEY annotation to prevent double mangling
|
|
clear_annotation(node, _KEY);
|
|
node.value = mangle(node.value);
|
|
} else if (node instanceof AST_Conditional) {
|
|
node.consequent = mangleStrings(node.consequent);
|
|
node.alternative = mangleStrings(node.alternative);
|
|
}
|
|
return node;
|
|
}));
|
|
}
|
|
}
|
|
|
|
export {
|
|
reserve_quoted_keys,
|
|
mangle_properties,
|
|
mangle_private_properties,
|
|
find_annotated_props,
|
|
};
|