first commit
This commit is contained in:
s.golasch
591
build/node_modules/uglify-js/lib/scope.js
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vendored
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591
build/node_modules/uglify-js/lib/scope.js
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@@ -0,0 +1,591 @@
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/***********************************************************************
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A JavaScript tokenizer / parser / beautifier / compressor.
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https://github.com/mishoo/UglifyJS2
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||||
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-------------------------------- (C) ---------------------------------
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Author: Mihai Bazon
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<mihai.bazon@gmail.com>
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http://mihai.bazon.net/blog
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Distributed under the BSD license:
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||||
|
||||
Copyright 2012 (c) Mihai Bazon <mihai.bazon@gmail.com>
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||||
|
||||
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.
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||||
|
||||
* 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.
|
||||
|
||||
***********************************************************************/
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||||
|
||||
"use strict";
|
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|
||||
function SymbolDef(scope, orig) {
|
||||
this.name = orig.name;
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||||
this.orig = [ orig ];
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this.eliminated = 0;
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||||
this.scope = scope;
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||||
this.references = [];
|
||||
this.replaced = 0;
|
||||
this.global = false;
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||||
this.mangled_name = null;
|
||||
this.undeclared = false;
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||||
this.id = SymbolDef.next_id++;
|
||||
};
|
||||
|
||||
SymbolDef.next_id = 1;
|
||||
|
||||
SymbolDef.prototype = {
|
||||
unmangleable: function(options) {
|
||||
if (!options) options = {};
|
||||
|
||||
return (this.global && !options.toplevel)
|
||||
|| this.undeclared
|
||||
|| (!options.eval && (this.scope.uses_eval || this.scope.uses_with))
|
||||
|| (options.keep_fnames
|
||||
&& (this.orig[0] instanceof AST_SymbolLambda
|
||||
|| this.orig[0] instanceof AST_SymbolDefun));
|
||||
},
|
||||
mangle: function(options) {
|
||||
var cache = options.cache && options.cache.props;
|
||||
if (this.global && cache && cache.has(this.name)) {
|
||||
this.mangled_name = cache.get(this.name);
|
||||
}
|
||||
else if (!this.mangled_name && !this.unmangleable(options)) {
|
||||
var s = this.scope;
|
||||
var sym = this.orig[0];
|
||||
if (options.ie8 && sym instanceof AST_SymbolLambda)
|
||||
s = s.parent_scope;
|
||||
var def;
|
||||
if (def = this.redefined()) {
|
||||
this.mangled_name = def.mangled_name || def.name;
|
||||
} else
|
||||
this.mangled_name = s.next_mangled(options, this);
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||||
if (this.global && cache) {
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||||
cache.set(this.name, this.mangled_name);
|
||||
}
|
||||
}
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||||
},
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||||
redefined: function() {
|
||||
return this.defun && this.defun.variables.get(this.name);
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||||
}
|
||||
};
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||||
|
||||
AST_Toplevel.DEFMETHOD("figure_out_scope", function(options){
|
||||
options = defaults(options, {
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||||
cache: null,
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||||
ie8: false,
|
||||
});
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||||
|
||||
// pass 1: setup scope chaining and handle definitions
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var self = this;
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||||
var scope = self.parent_scope = null;
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var labels = new Dictionary();
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||||
var defun = null;
|
||||
var tw = new TreeWalker(function(node, descend){
|
||||
if (node instanceof AST_Catch) {
|
||||
var save_scope = scope;
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||||
scope = new AST_Scope(node);
|
||||
scope.init_scope_vars(save_scope);
|
||||
descend();
|
||||
scope = save_scope;
|
||||
return true;
|
||||
}
|
||||
if (node instanceof AST_Scope) {
|
||||
node.init_scope_vars(scope);
|
||||
var save_scope = scope;
|
||||
var save_defun = defun;
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||||
var save_labels = labels;
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defun = scope = node;
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||||
labels = new Dictionary();
|
||||
descend();
|
||||
scope = save_scope;
|
||||
defun = save_defun;
|
||||
labels = save_labels;
|
||||
return true; // don't descend again in TreeWalker
|
||||
}
|
||||
if (node instanceof AST_LabeledStatement) {
|
||||
var l = node.label;
|
||||
if (labels.has(l.name)) {
|
||||
throw new Error(string_template("Label {name} defined twice", l));
|
||||
}
|
||||
labels.set(l.name, l);
|
||||
descend();
|
||||
labels.del(l.name);
|
||||
return true; // no descend again
|
||||
}
|
||||
if (node instanceof AST_With) {
|
||||
for (var s = scope; s; s = s.parent_scope)
|
||||
s.uses_with = true;
|
||||
return;
|
||||
}
|
||||
if (node instanceof AST_Symbol) {
|
||||
node.scope = scope;
|
||||
}
|
||||
if (node instanceof AST_Label) {
|
||||
node.thedef = node;
|
||||
node.references = [];
|
||||
}
|
||||
if (node instanceof AST_SymbolLambda) {
|
||||
defun.def_function(node);
|
||||
}
|
||||
else if (node instanceof AST_SymbolDefun) {
|
||||
// Careful here, the scope where this should be defined is
|
||||
// the parent scope. The reason is that we enter a new
|
||||
// scope when we encounter the AST_Defun node (which is
|
||||
// instanceof AST_Scope) but we get to the symbol a bit
|
||||
// later.
|
||||
(node.scope = defun.parent_scope).def_function(node);
|
||||
}
|
||||
else if (node instanceof AST_SymbolVar) {
|
||||
defun.def_variable(node);
|
||||
if (defun !== scope) {
|
||||
node.mark_enclosed(options);
|
||||
var def = scope.find_variable(node);
|
||||
if (node.thedef !== def) {
|
||||
node.thedef = def;
|
||||
node.reference(options);
|
||||
}
|
||||
}
|
||||
}
|
||||
else if (node instanceof AST_SymbolCatch) {
|
||||
scope.def_variable(node).defun = defun;
|
||||
}
|
||||
else if (node instanceof AST_LabelRef) {
|
||||
var sym = labels.get(node.name);
|
||||
if (!sym) throw new Error(string_template("Undefined label {name} [{line},{col}]", {
|
||||
name: node.name,
|
||||
line: node.start.line,
|
||||
col: node.start.col
|
||||
}));
|
||||
node.thedef = sym;
|
||||
}
|
||||
});
|
||||
self.walk(tw);
|
||||
|
||||
// pass 2: find back references and eval
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||||
self.globals = new Dictionary();
|
||||
var tw = new TreeWalker(function(node, descend){
|
||||
if (node instanceof AST_LoopControl && node.label) {
|
||||
node.label.thedef.references.push(node);
|
||||
return true;
|
||||
}
|
||||
if (node instanceof AST_SymbolRef) {
|
||||
var name = node.name;
|
||||
if (name == "eval" && tw.parent() instanceof AST_Call) {
|
||||
for (var s = node.scope; s && !s.uses_eval; s = s.parent_scope) {
|
||||
s.uses_eval = true;
|
||||
}
|
||||
}
|
||||
var sym = node.scope.find_variable(name);
|
||||
if (!sym) {
|
||||
sym = self.def_global(node);
|
||||
} else if (sym.scope instanceof AST_Lambda && name == "arguments") {
|
||||
sym.scope.uses_arguments = true;
|
||||
}
|
||||
node.thedef = sym;
|
||||
node.reference(options);
|
||||
return true;
|
||||
}
|
||||
// ensure mangling works if catch reuses a scope variable
|
||||
var def;
|
||||
if (node instanceof AST_SymbolCatch && (def = node.definition().redefined())) {
|
||||
var s = node.scope;
|
||||
while (s) {
|
||||
push_uniq(s.enclosed, def);
|
||||
if (s === def.scope) break;
|
||||
s = s.parent_scope;
|
||||
}
|
||||
}
|
||||
});
|
||||
self.walk(tw);
|
||||
|
||||
// pass 3: fix up any scoping issue with IE8
|
||||
if (options.ie8) {
|
||||
self.walk(new TreeWalker(function(node, descend) {
|
||||
if (node instanceof AST_SymbolCatch) {
|
||||
var name = node.name;
|
||||
var refs = node.thedef.references;
|
||||
var scope = node.thedef.defun;
|
||||
var def = scope.find_variable(name) || self.globals.get(name) || scope.def_variable(node);
|
||||
refs.forEach(function(ref) {
|
||||
ref.thedef = def;
|
||||
ref.reference(options);
|
||||
});
|
||||
node.thedef = def;
|
||||
node.reference(options);
|
||||
return true;
|
||||
}
|
||||
}));
|
||||
}
|
||||
|
||||
if (options.cache) {
|
||||
this.cname = options.cache.cname;
|
||||
}
|
||||
});
|
||||
|
||||
AST_Toplevel.DEFMETHOD("def_global", function(node){
|
||||
var globals = this.globals, name = node.name;
|
||||
if (globals.has(name)) {
|
||||
return globals.get(name);
|
||||
} else {
|
||||
var g = new SymbolDef(this, node);
|
||||
g.undeclared = true;
|
||||
g.global = true;
|
||||
globals.set(name, g);
|
||||
return g;
|
||||
}
|
||||
});
|
||||
|
||||
AST_Scope.DEFMETHOD("init_scope_vars", function(parent_scope){
|
||||
this.variables = new Dictionary(); // map name to AST_SymbolVar (variables defined in this scope; includes functions)
|
||||
this.functions = new Dictionary(); // map name to AST_SymbolDefun (functions defined in this scope)
|
||||
this.uses_with = false; // will be set to true if this or some nested scope uses the `with` statement
|
||||
this.uses_eval = false; // will be set to true if this or nested scope uses the global `eval`
|
||||
this.parent_scope = parent_scope; // the parent scope
|
||||
this.enclosed = []; // a list of variables from this or outer scope(s) that are referenced from this or inner scopes
|
||||
this.cname = -1; // the current index for mangling functions/variables
|
||||
});
|
||||
|
||||
AST_Lambda.DEFMETHOD("init_scope_vars", function(){
|
||||
AST_Scope.prototype.init_scope_vars.apply(this, arguments);
|
||||
this.uses_arguments = false;
|
||||
this.def_variable(new AST_SymbolFunarg({
|
||||
name: "arguments",
|
||||
start: this.start,
|
||||
end: this.end
|
||||
}));
|
||||
});
|
||||
|
||||
AST_Symbol.DEFMETHOD("mark_enclosed", function(options) {
|
||||
var def = this.definition();
|
||||
var s = this.scope;
|
||||
while (s) {
|
||||
push_uniq(s.enclosed, def);
|
||||
if (options.keep_fnames) {
|
||||
s.functions.each(function(d) {
|
||||
push_uniq(def.scope.enclosed, d);
|
||||
});
|
||||
}
|
||||
if (s === def.scope) break;
|
||||
s = s.parent_scope;
|
||||
}
|
||||
});
|
||||
|
||||
AST_Symbol.DEFMETHOD("reference", function(options) {
|
||||
this.definition().references.push(this);
|
||||
this.mark_enclosed(options);
|
||||
});
|
||||
|
||||
AST_Scope.DEFMETHOD("find_variable", function(name){
|
||||
if (name instanceof AST_Symbol) name = name.name;
|
||||
return this.variables.get(name)
|
||||
|| (this.parent_scope && this.parent_scope.find_variable(name));
|
||||
});
|
||||
|
||||
AST_Scope.DEFMETHOD("def_function", function(symbol){
|
||||
var def = this.def_variable(symbol);
|
||||
this.functions.set(symbol.name, def);
|
||||
return def;
|
||||
});
|
||||
|
||||
AST_Scope.DEFMETHOD("def_variable", function(symbol){
|
||||
var def;
|
||||
if (!this.variables.has(symbol.name)) {
|
||||
def = new SymbolDef(this, symbol);
|
||||
this.variables.set(symbol.name, def);
|
||||
def.global = !this.parent_scope;
|
||||
} else {
|
||||
def = this.variables.get(symbol.name);
|
||||
def.orig.push(symbol);
|
||||
}
|
||||
return symbol.thedef = def;
|
||||
});
|
||||
|
||||
AST_Scope.DEFMETHOD("next_mangled", function(options){
|
||||
var ext = this.enclosed;
|
||||
out: while (true) {
|
||||
var m = base54(++this.cname);
|
||||
if (!is_identifier(m)) continue; // skip over "do"
|
||||
|
||||
// https://github.com/mishoo/UglifyJS2/issues/242 -- do not
|
||||
// shadow a name reserved from mangling.
|
||||
if (member(m, options.reserved)) continue;
|
||||
|
||||
// we must ensure that the mangled name does not shadow a name
|
||||
// from some parent scope that is referenced in this or in
|
||||
// inner scopes.
|
||||
for (var i = ext.length; --i >= 0;) {
|
||||
var sym = ext[i];
|
||||
var name = sym.mangled_name || (sym.unmangleable(options) && sym.name);
|
||||
if (m == name) continue out;
|
||||
}
|
||||
return m;
|
||||
}
|
||||
});
|
||||
|
||||
AST_Function.DEFMETHOD("next_mangled", function(options, def){
|
||||
// #179, #326
|
||||
// in Safari strict mode, something like (function x(x){...}) is a syntax error;
|
||||
// a function expression's argument cannot shadow the function expression's name
|
||||
|
||||
var tricky_def = def.orig[0] instanceof AST_SymbolFunarg && this.name && this.name.definition();
|
||||
|
||||
// the function's mangled_name is null when keep_fnames is true
|
||||
var tricky_name = tricky_def ? tricky_def.mangled_name || tricky_def.name : null;
|
||||
|
||||
while (true) {
|
||||
var name = AST_Lambda.prototype.next_mangled.call(this, options, def);
|
||||
if (!tricky_name || tricky_name != name)
|
||||
return name;
|
||||
}
|
||||
});
|
||||
|
||||
AST_Symbol.DEFMETHOD("unmangleable", function(options){
|
||||
var def = this.definition();
|
||||
return !def || def.unmangleable(options);
|
||||
});
|
||||
|
||||
// labels are always mangleable
|
||||
AST_Label.DEFMETHOD("unmangleable", return_false);
|
||||
|
||||
AST_Symbol.DEFMETHOD("unreferenced", function(){
|
||||
return this.definition().references.length == 0
|
||||
&& !(this.scope.uses_eval || this.scope.uses_with);
|
||||
});
|
||||
|
||||
AST_Symbol.DEFMETHOD("definition", function(){
|
||||
return this.thedef;
|
||||
});
|
||||
|
||||
AST_Symbol.DEFMETHOD("global", function(){
|
||||
return this.definition().global;
|
||||
});
|
||||
|
||||
AST_Toplevel.DEFMETHOD("_default_mangler_options", function(options) {
|
||||
options = defaults(options, {
|
||||
eval : false,
|
||||
ie8 : false,
|
||||
keep_fnames : false,
|
||||
reserved : [],
|
||||
toplevel : false,
|
||||
});
|
||||
if (!Array.isArray(options.reserved)) options.reserved = [];
|
||||
// Never mangle arguments
|
||||
push_uniq(options.reserved, "arguments");
|
||||
return options;
|
||||
});
|
||||
|
||||
AST_Toplevel.DEFMETHOD("mangle_names", function(options){
|
||||
options = this._default_mangler_options(options);
|
||||
|
||||
// We only need to mangle declaration nodes. Special logic wired
|
||||
// into the code generator will display the mangled name if it's
|
||||
// present (and for AST_SymbolRef-s it'll use the mangled name of
|
||||
// the AST_SymbolDeclaration that it points to).
|
||||
var lname = -1;
|
||||
var to_mangle = [];
|
||||
|
||||
if (options.cache) {
|
||||
this.globals.each(collect);
|
||||
}
|
||||
|
||||
var tw = new TreeWalker(function(node, descend){
|
||||
if (node instanceof AST_LabeledStatement) {
|
||||
// lname is incremented when we get to the AST_Label
|
||||
var save_nesting = lname;
|
||||
descend();
|
||||
lname = save_nesting;
|
||||
return true; // don't descend again in TreeWalker
|
||||
}
|
||||
if (node instanceof AST_Scope) {
|
||||
node.variables.each(collect);
|
||||
return;
|
||||
}
|
||||
if (node instanceof AST_Label) {
|
||||
var name;
|
||||
do name = base54(++lname); while (!is_identifier(name));
|
||||
node.mangled_name = name;
|
||||
return true;
|
||||
}
|
||||
if (!options.ie8 && node instanceof AST_SymbolCatch) {
|
||||
to_mangle.push(node.definition());
|
||||
return;
|
||||
}
|
||||
});
|
||||
this.walk(tw);
|
||||
to_mangle.forEach(function(def){ def.mangle(options) });
|
||||
|
||||
if (options.cache) {
|
||||
options.cache.cname = this.cname;
|
||||
}
|
||||
|
||||
function collect(symbol) {
|
||||
if (!member(symbol.name, options.reserved)) {
|
||||
to_mangle.push(symbol);
|
||||
}
|
||||
}
|
||||
});
|
||||
|
||||
AST_Toplevel.DEFMETHOD("find_unique_prefix", function(options) {
|
||||
var letters = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ$_";
|
||||
var cache = options.cache && options.cache.props;
|
||||
var prefixes = Object.create(null);
|
||||
options.reserved.forEach(add_prefix);
|
||||
this.globals.each(add_def);
|
||||
this.walk(new TreeWalker(function(node) {
|
||||
if (node instanceof AST_Scope) node.variables.each(add_def);
|
||||
if (node instanceof AST_SymbolCatch) add_def(node.definition());
|
||||
}));
|
||||
var prefix, i = 0;
|
||||
do {
|
||||
prefix = create_name(i++);
|
||||
} while (prefixes[prefix]);
|
||||
return prefix;
|
||||
|
||||
function add_prefix(name) {
|
||||
if (/[0-9]$/.test(name)) {
|
||||
prefixes[name.replace(/[0-9]+$/, "")] = true;
|
||||
}
|
||||
}
|
||||
|
||||
function add_def(def) {
|
||||
var name = def.name;
|
||||
if (def.global && cache && cache.has(name)) name = cache.get(name);
|
||||
else if (!def.unmangleable(options)) return;
|
||||
add_prefix(name);
|
||||
}
|
||||
|
||||
function create_name(num) {
|
||||
var name = "";
|
||||
do {
|
||||
name += letters[num % letters.length];
|
||||
num = Math.floor(num / letters.length);
|
||||
} while (num);
|
||||
return name;
|
||||
}
|
||||
});
|
||||
|
||||
AST_Toplevel.DEFMETHOD("expand_names", function(options) {
|
||||
options = this._default_mangler_options(options);
|
||||
var prefix = this.find_unique_prefix(options);
|
||||
this.globals.each(rename);
|
||||
this.walk(new TreeWalker(function(node) {
|
||||
if (node instanceof AST_Scope) node.variables.each(rename);
|
||||
if (node instanceof AST_SymbolCatch) rename(node.definition());
|
||||
}));
|
||||
|
||||
function rename(def) {
|
||||
if (def.global || def.unmangleable(options)) return;
|
||||
if (member(def.name, options.reserved)) return;
|
||||
var d = def.redefined();
|
||||
def.name = d ? d.name : prefix + def.id;
|
||||
def.orig.forEach(function(sym) {
|
||||
sym.name = def.name;
|
||||
});
|
||||
def.references.forEach(function(sym) {
|
||||
sym.name = def.name;
|
||||
});
|
||||
}
|
||||
});
|
||||
|
||||
AST_Node.DEFMETHOD("tail_node", return_this);
|
||||
AST_Sequence.DEFMETHOD("tail_node", function() {
|
||||
return this.expressions[this.expressions.length - 1];
|
||||
});
|
||||
|
||||
AST_Toplevel.DEFMETHOD("compute_char_frequency", function(options){
|
||||
options = this._default_mangler_options(options);
|
||||
try {
|
||||
AST_Node.prototype.print = function(stream, force_parens) {
|
||||
this._print(stream, force_parens);
|
||||
if (this instanceof AST_Symbol && !this.unmangleable(options)) {
|
||||
base54.consider(this.name, -1);
|
||||
} else if (options.properties) {
|
||||
if (this instanceof AST_Dot) {
|
||||
base54.consider(this.property, -1);
|
||||
} else if (this instanceof AST_Sub) {
|
||||
skip_string(this.property);
|
||||
}
|
||||
}
|
||||
};
|
||||
base54.consider(this.print_to_string(), 1);
|
||||
} finally {
|
||||
AST_Node.prototype.print = AST_Node.prototype._print;
|
||||
}
|
||||
base54.sort();
|
||||
|
||||
function skip_string(node) {
|
||||
if (node instanceof AST_String) {
|
||||
base54.consider(node.value, -1);
|
||||
} else if (node instanceof AST_Conditional) {
|
||||
skip_string(node.consequent);
|
||||
skip_string(node.alternative);
|
||||
} else if (node instanceof AST_Sequence) {
|
||||
skip_string(node.tail_node());
|
||||
}
|
||||
}
|
||||
});
|
||||
|
||||
var base54 = (function() {
|
||||
var leading = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ$_".split("");
|
||||
var digits = "0123456789".split("");
|
||||
var chars, frequency;
|
||||
function reset() {
|
||||
frequency = Object.create(null);
|
||||
leading.forEach(function(ch) {
|
||||
frequency[ch] = 0;
|
||||
});
|
||||
digits.forEach(function(ch) {
|
||||
frequency[ch] = 0;
|
||||
});
|
||||
}
|
||||
base54.consider = function(str, delta) {
|
||||
for (var i = str.length; --i >= 0;) {
|
||||
frequency[str[i]] += delta;
|
||||
}
|
||||
};
|
||||
function compare(a, b) {
|
||||
return frequency[b] - frequency[a];
|
||||
}
|
||||
base54.sort = function() {
|
||||
chars = mergeSort(leading, compare).concat(mergeSort(digits, compare));
|
||||
};
|
||||
base54.reset = reset;
|
||||
reset();
|
||||
function base54(num) {
|
||||
var ret = "", base = 54;
|
||||
num++;
|
||||
do {
|
||||
num--;
|
||||
ret += chars[num % base];
|
||||
num = Math.floor(num / base);
|
||||
base = 64;
|
||||
} while (num > 0);
|
||||
return ret;
|
||||
};
|
||||
return base54;
|
||||
})();
|
||||
Reference in New Issue
Block a user