c3df8f1d3f
- Use inline `isset` expression instead function. status: done - Use inline `is`. status: done - `some is NaN` to `isNaN(some)`. status: done - operator `?` instead `isset`. status: done - rename runtime prefix `$_cola` to `_ColaRuntime$$`. status: done - dotal names of refs: done
2418 lines
105 KiB
JavaScript
2418 lines
105 KiB
JavaScript
/***********************************************************************
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A JavaScript tokenizer / parser / beautifier / compressor.
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https://github.com/mishoo/UglifyJS2
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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
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modification, are permitted provided that the following conditions
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are met:
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* Redistributions of source code must retain the above
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copyright notice, this list of conditions and the following
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disclaimer.
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* Redistributions in binary form must reproduce the above
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copyright notice, this list of conditions and the following
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disclaimer in the documentation and/or other materials
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provided with the distribution.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER “AS IS” AND ANY
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EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
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OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
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TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
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THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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SUCH DAMAGE.
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***********************************************************************/
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"use strict";
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!this.Cola && (this.Cola = {});
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Cola.Compressor = function (options, false_by_default) {
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if (!(this instanceof Cola.Compressor))
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return new Cola.Compressor(options, false_by_default);
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Cola.TreeTransformer.call(this, this.before, this.after);
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this.options = Cola.defaults(options, {
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sequences : !false_by_default,
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properties : !false_by_default,
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dead_code : !false_by_default,
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|
drop_debugger : !false_by_default,
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unsafe : false,
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|
unsafe_comps : false,
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|
conditionals : !false_by_default,
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|
comparisons : !false_by_default,
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|
evaluate : !false_by_default,
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|
booleans : !false_by_default,
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|
loops : !false_by_default,
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|
unused : !false_by_default,
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|
hoist_funs : !false_by_default,
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|
keep_fargs : false,
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|
hoist_vars : false,
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|
if_return : !false_by_default,
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join_vars : !false_by_default,
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|
cascade : !false_by_default,
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|
side_effects : !false_by_default,
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|
pure_getters : false,
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|
pure_funcs : null,
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|
negate_iife : !false_by_default,
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screw_ie8 : false,
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|
drop_console : false,
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angular : false,
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warnings : true,
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global_defs : {}
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,is_js : false
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}, true);
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};
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Cola.Compressor.prototype = new Cola.TreeTransformer;
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Cola.merge(Cola.Compressor.prototype, {
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option: function(key) { return this.options[key] },
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warn: function() {
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if (this.options.warnings)
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Cola.AST_Node.warn.apply(Cola.AST_Node, arguments);
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},
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before: function(node, descend, in_list) {
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if (node._squeezed) return node;
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var was_scope = false;
|
|
if (node instanceof Cola.AST_Scope) {
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node = node.hoist_declarations(this);
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was_scope = true;
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|
}
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descend(node, this);
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node = node.optimize(this);
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if (was_scope && node instanceof Cola.AST_Scope) {
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node.drop_unused(this);
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descend(node, this);
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|
}
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node._squeezed = true;
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return node;
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|
}
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});
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Cola.Compressor.MathFuncs = {
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abs: true,
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acos: true,
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asin: true,
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atan: true,
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atan2: true,
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ceil: true,
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cos: true,
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|
exp: true,
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|
floor: true,
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|
imul: true,
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|
log: true,
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max: true,
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min: true,
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pow: true,
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round: true,
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sin: true,
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sqrt: true,
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tan: true
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};
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(function(){
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function OPT(node, optimizer) {
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node.DEFMETHOD("optimize", function(compressor){
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var self = this;
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if (self._optimized) return self;
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var opt = optimizer(self, compressor);
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|
opt._optimized = true;
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|
if (opt === self) return opt;
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|
return opt.transform(compressor);
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});
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};
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OPT(Cola.AST_Node, function(self, compressor){
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return self;
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});
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Cola.AST_Node.DEFMETHOD("equivalent_to", function(node){
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// XXX: this is a rather expensive way to test two node's equivalence:
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return this.print_to_string() == node.print_to_string();
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});
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function make_node(ctor, orig, props) {
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|
if (!props) props = {};
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|
if (orig) {
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|
if (!props.start) props.start = orig.start;
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|
if (!props.end) props.end = orig.end;
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}
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return new ctor(props);
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};
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function make_node_from_constant(compressor, val, orig) {
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|
// XXX: WIP.
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// if (val instanceof Cola.AST_Node) return val.transform(new Cola.TreeTransformer(null, function(node){
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// if (node instanceof Cola.AST_SymbolRef) {
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// var scope = compressor.find_parent(Cola.AST_Scope);
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// var def = scope.find_variable(node);
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// node.thedef = def;
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// return node;
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// }
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// })).transform(compressor);
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if (val instanceof Cola.AST_Node) return val.transform(compressor);
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switch (typeof val) {
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case "string":
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return make_node(Cola.AST_String, orig, {
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value: val
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}).optimize(compressor);
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case "number":
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return make_node(isNaN(val) ? Cola.AST_NaN : Cola.AST_Number, orig, {
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value: val
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}).optimize(compressor);
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case "boolean":
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return make_node(val ? Cola.AST_True : Cola.AST_False, orig).optimize(compressor);
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case "undefined":
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return make_node(Cola.AST_Undefined, orig).optimize(compressor);
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default:
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if (val === null) {
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return make_node(Cola.AST_Null, orig).optimize(compressor);
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}
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if (val instanceof RegExp) {
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return make_node(Cola.AST_RegExp, orig).optimize(compressor);
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}
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throw new Error(Cola.string_template("Can't handle constant of type: {type}", {
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type: typeof val
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}));
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}
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};
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function as_statement_array(thing) {
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if (thing === null) return [];
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if (thing instanceof Cola.AST_BlockStatement) return thing.body;
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if (thing instanceof Cola.AST_EmptyStatement) return [];
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if (thing instanceof Cola.AST_Statement) return [ thing ];
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throw new Error("Can't convert thing to statement array");
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};
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function is_empty(thing) {
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if (thing === null) return true;
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if (thing instanceof Cola.AST_EmptyStatement) return true;
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if (thing instanceof Cola.AST_BlockStatement) return thing.body.length == 0;
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return false;
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};
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function loop_body(x) {
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if (x instanceof Cola.AST_Switch) return x;
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if (x instanceof Cola.AST_For || x instanceof Cola.AST_ForIn || x instanceof Cola.AST_DWLoop) {
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return (x.body instanceof Cola.AST_BlockStatement ? x.body : x);
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}
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return x;
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};
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function tighten_body(statements, compressor) {
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var CHANGED;
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do {
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CHANGED = false;
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if (compressor.option("angular")) {
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statements = process_for_angular(statements);
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}
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statements = eliminate_spurious_blocks(statements);
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if (compressor.option("dead_code")) {
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statements = eliminate_dead_code(statements, compressor);
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}
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if (compressor.option("if_return")) {
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statements = handle_if_return(statements, compressor);
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}
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if (compressor.option("sequences")) {
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statements = sequencesize(statements, compressor);
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}
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if (compressor.option("join_vars")) {
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statements = join_consecutive_vars(statements, compressor);
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}
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} while (CHANGED);
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if (compressor.option("negate_iife")) {
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negate_iifes(statements, compressor);
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}
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return statements;
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function process_for_angular(statements) {
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function make_injector(func, name) {
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return make_node(Cola.AST_SimpleStatement, func, {
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body: make_node(Cola.AST_Assign, func, {
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operator: "=",
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left: make_node(Cola.AST_Dot, name, {
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expression: make_node(Cola.AST_SymbolRef, name, name),
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property: "$inject"
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}),
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right: make_node(Cola.AST_Array, func, {
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elements: func.argnames.map(function(sym){
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return make_node(Cola.AST_String, sym, { value: sym.name });
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})
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})
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})
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});
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}
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return statements.reduce(function(a, stat){
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a.push(stat);
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var token = stat.start;
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var comments = token.comments_before;
|
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if (comments && comments.length > 0) {
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var last = comments.pop();
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if (/@ngInject/.test(last.value)) {
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// case 1: defun
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if (stat instanceof Cola.AST_Defun) {
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a.push(make_injector(stat, stat.name));
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}
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else if (stat instanceof Cola.AST_Definitions) {
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stat.definitions.forEach(function(def){
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if (def.value && def.value instanceof Cola.AST_Lambda) {
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a.push(make_injector(def.value, def.name));
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}
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});
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}
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else {
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compressor.warn("Unknown statement marked with @ngInject [{file}:{line},{col}]", token);
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}
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}
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}
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return a;
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}, []);
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}
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function eliminate_spurious_blocks(statements) {
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var seen_dirs = [];
|
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return statements.reduce(function(a, stat){
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if (stat instanceof Cola.AST_BlockStatement) {
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CHANGED = true;
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a.push.apply(a, eliminate_spurious_blocks(stat.body));
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} else if (stat instanceof Cola.AST_EmptyStatement) {
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CHANGED = true;
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} else if (stat instanceof Cola.AST_Directive) {
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if (seen_dirs.indexOf(stat.value) < 0) {
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a.push(stat);
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seen_dirs.push(stat.value);
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} else {
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CHANGED = true;
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}
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} else {
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a.push(stat);
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}
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return a;
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}, []);
|
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};
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function handle_if_return(statements, compressor) {
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var self = compressor.self();
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var in_lambda = self instanceof Cola.AST_Lambda;
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var ret = [];
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loop: for (var i = statements.length; --i >= 0;) {
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var stat = statements[i];
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switch (true) {
|
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case (in_lambda && stat instanceof Cola.AST_Return && !stat.value && ret.length == 0):
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CHANGED = true;
|
|
// note, ret.length is probably always zero
|
|
// because we drop unreachable code before this
|
|
// step. nevertheless, it's good to check.
|
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continue loop;
|
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case stat instanceof Cola.AST_If:
|
|
if (stat.body instanceof Cola.AST_Return) {
|
|
//---
|
|
// pretty silly case, but:
|
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// if (foo()) return; return; ==> foo(); return;
|
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if (((in_lambda && ret.length == 0)
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|| (ret[0] instanceof Cola.AST_Return && !ret[0].value))
|
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&& !stat.body.value && !stat.alternative) {
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CHANGED = true;
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var cond = make_node(Cola.AST_SimpleStatement, stat.condition, {
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body: stat.condition
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});
|
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ret.unshift(cond);
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continue loop;
|
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}
|
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//---
|
|
// if (foo()) return x; return y; ==> return foo() ? x : y;
|
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if (ret[0] instanceof Cola.AST_Return && stat.body.value && ret[0].value && !stat.alternative) {
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CHANGED = true;
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stat = stat.clone();
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stat.alternative = ret[0];
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ret[0] = stat.transform(compressor);
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continue loop;
|
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}
|
|
//---
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// if (foo()) return x; [ return ; ] ==> return foo() ? x : undefined;
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if ((ret.length == 0 || ret[0] instanceof Cola.AST_Return) && stat.body.value && !stat.alternative && in_lambda) {
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CHANGED = true;
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stat = stat.clone();
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stat.alternative = ret[0] || make_node(Cola.AST_Return, stat, {
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value: make_node(Cola.AST_Undefined, stat)
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});
|
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ret[0] = stat.transform(compressor);
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continue loop;
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}
|
|
//---
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// if (foo()) return; [ else x... ]; y... ==> if (!foo()) { x...; y... }
|
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if (!stat.body.value && in_lambda) {
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CHANGED = true;
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stat = stat.clone();
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stat.condition = stat.condition.negate(compressor);
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stat.body = make_node(Cola.AST_BlockStatement, stat, {
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body: as_statement_array(stat.alternative).concat(ret)
|
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});
|
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stat.alternative = null;
|
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ret = [ stat.transform(compressor) ];
|
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continue loop;
|
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}
|
|
//---
|
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if (ret.length == 1 && in_lambda && ret[0] instanceof Cola.AST_SimpleStatement
|
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&& (!stat.alternative || stat.alternative instanceof Cola.AST_SimpleStatement)) {
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CHANGED = true;
|
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ret.push(make_node(Cola.AST_Return, ret[0], {
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value: make_node(Cola.AST_Undefined, ret[0])
|
|
}).transform(compressor));
|
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ret = as_statement_array(stat.alternative).concat(ret);
|
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ret.unshift(stat);
|
|
continue loop;
|
|
}
|
|
}
|
|
|
|
var ab = aborts(stat.body);
|
|
var lct = ab instanceof Cola.AST_LoopControl ? compressor.loopcontrol_target(ab.label) : null;
|
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if (ab && ((ab instanceof Cola.AST_Return && !ab.value && in_lambda)
|
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|| (ab instanceof Cola.AST_Continue && self === loop_body(lct))
|
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|| (ab instanceof Cola.AST_Break && lct instanceof Cola.AST_BlockStatement && self === lct))) {
|
|
if (ab.label) {
|
|
Cola.remove(ab.label.thedef.references, ab);
|
|
}
|
|
CHANGED = true;
|
|
var body = as_statement_array(stat.body).slice(0, -1);
|
|
stat = stat.clone();
|
|
stat.condition = stat.condition.negate(compressor);
|
|
stat.body = make_node(Cola.AST_BlockStatement, stat, {
|
|
body: as_statement_array(stat.alternative).concat(ret)
|
|
});
|
|
stat.alternative = make_node(Cola.AST_BlockStatement, stat, {
|
|
body: body
|
|
});
|
|
ret = [ stat.transform(compressor) ];
|
|
continue loop;
|
|
}
|
|
|
|
var ab = aborts(stat.alternative);
|
|
var lct = ab instanceof Cola.AST_LoopControl ? compressor.loopcontrol_target(ab.label) : null;
|
|
if (ab && ((ab instanceof Cola.AST_Return && !ab.value && in_lambda)
|
|
|| (ab instanceof Cola.AST_Continue && self === loop_body(lct))
|
|
|| (ab instanceof Cola.AST_Break && lct instanceof Cola.AST_BlockStatement && self === lct))) {
|
|
if (ab.label) {
|
|
Cola.remove(ab.label.thedef.references, ab);
|
|
}
|
|
CHANGED = true;
|
|
stat = stat.clone();
|
|
stat.body = make_node(Cola.AST_BlockStatement, stat.body, {
|
|
body: as_statement_array(stat.body).concat(ret)
|
|
});
|
|
stat.alternative = make_node(Cola.AST_BlockStatement, stat.alternative, {
|
|
body: as_statement_array(stat.alternative).slice(0, -1)
|
|
});
|
|
ret = [ stat.transform(compressor) ];
|
|
continue loop;
|
|
}
|
|
|
|
ret.unshift(stat);
|
|
break;
|
|
default:
|
|
ret.unshift(stat);
|
|
break;
|
|
}
|
|
}
|
|
return ret;
|
|
};
|
|
|
|
function eliminate_dead_code(statements, compressor) {
|
|
var has_quit = false;
|
|
var orig = statements.length;
|
|
var self = compressor.self();
|
|
statements = statements.reduce(function(a, stat){
|
|
if (has_quit) {
|
|
extract_declarations_from_unreachable_code(compressor, stat, a);
|
|
} else {
|
|
if (stat instanceof Cola.AST_LoopControl) {
|
|
var lct = compressor.loopcontrol_target(stat.label);
|
|
if ((stat instanceof Cola.AST_Break
|
|
&& lct instanceof Cola.AST_BlockStatement
|
|
&& loop_body(lct) === self) || (stat instanceof Cola.AST_Continue
|
|
&& loop_body(lct) === self)) {
|
|
if (stat.label) {
|
|
Cola.remove(stat.label.thedef.references, stat);
|
|
}
|
|
} else {
|
|
a.push(stat);
|
|
}
|
|
} else {
|
|
a.push(stat);
|
|
}
|
|
if (aborts(stat)) has_quit = true;
|
|
}
|
|
return a;
|
|
}, []);
|
|
CHANGED = statements.length != orig;
|
|
return statements;
|
|
};
|
|
|
|
function sequencesize(statements, compressor) {
|
|
if (statements.length < 2) return statements;
|
|
var seq = [], ret = [];
|
|
function push_seq() {
|
|
seq = Cola.AST_Seq.from_array(seq);
|
|
if (seq) ret.push(make_node(Cola.AST_SimpleStatement, seq, {
|
|
body: seq
|
|
}));
|
|
seq = [];
|
|
};
|
|
statements.forEach(function(stat){
|
|
if (stat instanceof Cola.AST_SimpleStatement) seq.push(stat.body);
|
|
else push_seq(), ret.push(stat);
|
|
});
|
|
push_seq();
|
|
ret = sequencesize_2(ret, compressor);
|
|
CHANGED = ret.length != statements.length;
|
|
return ret;
|
|
};
|
|
|
|
function sequencesize_2(statements, compressor) {
|
|
function cons_seq(right) {
|
|
ret.pop();
|
|
var left = prev.body;
|
|
if (left instanceof Cola.AST_Seq) {
|
|
left.add(right);
|
|
} else {
|
|
left = Cola.AST_Seq.cons(left, right);
|
|
}
|
|
return left.transform(compressor);
|
|
};
|
|
var ret = [], prev = null;
|
|
statements.forEach(function(stat){
|
|
if (prev) {
|
|
if (stat instanceof Cola.AST_For) {
|
|
var opera = {};
|
|
try {
|
|
prev.body.walk(new Cola.TreeWalker(function(node){
|
|
if (node instanceof Cola.AST_Binary && node.operator == "in")
|
|
throw opera;
|
|
}));
|
|
if (stat.init && !(stat.init instanceof Cola.AST_Definitions)) {
|
|
stat.init = cons_seq(stat.init);
|
|
}
|
|
else if (!stat.init) {
|
|
stat.init = prev.body;
|
|
ret.pop();
|
|
}
|
|
} catch(ex) {
|
|
if (ex !== opera) throw ex;
|
|
}
|
|
}
|
|
else if (stat instanceof Cola.AST_If) {
|
|
stat.condition = cons_seq(stat.condition);
|
|
}
|
|
else if (stat instanceof Cola.AST_With) {
|
|
stat.expression = cons_seq(stat.expression);
|
|
}
|
|
else if (stat instanceof Cola.AST_Exit && stat.value) {
|
|
stat.value = cons_seq(stat.value);
|
|
}
|
|
else if (stat instanceof Cola.AST_Exit) {
|
|
stat.value = cons_seq(make_node(Cola.AST_Undefined, stat));
|
|
}
|
|
else if (stat instanceof Cola.AST_Switch) {
|
|
stat.expression = cons_seq(stat.expression);
|
|
}
|
|
}
|
|
ret.push(stat);
|
|
prev = stat instanceof Cola.AST_SimpleStatement ? stat : null;
|
|
});
|
|
return ret;
|
|
};
|
|
|
|
function join_consecutive_vars(statements, compressor) {
|
|
var prev = null;
|
|
return statements.reduce(function(a, stat){
|
|
if (stat instanceof Cola.AST_Definitions && prev && prev.TYPE == stat.TYPE) {
|
|
prev.definitions = prev.definitions.concat(stat.definitions);
|
|
CHANGED = true;
|
|
}
|
|
else if (stat instanceof Cola.AST_For
|
|
&& prev instanceof Cola.AST_Definitions
|
|
&& (!stat.init || stat.init.TYPE == prev.TYPE)) {
|
|
CHANGED = true;
|
|
a.pop();
|
|
if (stat.init) {
|
|
stat.init.definitions = prev.definitions.concat(stat.init.definitions);
|
|
} else {
|
|
stat.init = prev;
|
|
}
|
|
a.push(stat);
|
|
prev = stat;
|
|
}
|
|
else {
|
|
prev = stat;
|
|
a.push(stat);
|
|
}
|
|
return a;
|
|
}, []);
|
|
};
|
|
|
|
function negate_iifes(statements, compressor) {
|
|
statements.forEach(function(stat){
|
|
if (stat instanceof Cola.AST_SimpleStatement) {
|
|
stat.body = (function transform(thing) {
|
|
return thing.transform(new Cola.TreeTransformer(function(node){
|
|
if (node instanceof Cola.AST_Call && node.expression instanceof Cola.AST_Function) {
|
|
return make_node(Cola.AST_UnaryPrefix, node, {
|
|
operator: "!",
|
|
expression: node
|
|
});
|
|
}
|
|
else if (node instanceof Cola.AST_Call) {
|
|
node.expression = transform(node.expression);
|
|
}
|
|
else if (node instanceof Cola.AST_Seq) {
|
|
node.car = transform(node.car);
|
|
}
|
|
else if (node instanceof Cola.AST_Conditional) {
|
|
var expr = transform(node.condition);
|
|
if (expr !== node.condition) {
|
|
// it has been negated, reverse
|
|
node.condition = expr;
|
|
var tmp = node.consequent;
|
|
node.consequent = node.alternative;
|
|
node.alternative = tmp;
|
|
}
|
|
}
|
|
return node;
|
|
}));
|
|
})(stat.body);
|
|
}
|
|
});
|
|
};
|
|
|
|
};
|
|
|
|
function extract_declarations_from_unreachable_code(compressor, stat, target) {
|
|
compressor.warn("Dropping unreachable code [{file}:{line},{col}]", stat.start);
|
|
stat.walk(new Cola.TreeWalker(function(node){
|
|
if (node instanceof Cola.AST_Definitions) {
|
|
compressor.warn("Declarations in unreachable code! [{file}:{line},{col}]", node.start);
|
|
node.remove_initializers();
|
|
target.push(node);
|
|
return true;
|
|
}
|
|
if (node instanceof Cola.AST_Defun) {
|
|
target.push(node);
|
|
return true;
|
|
}
|
|
if (node instanceof Cola.AST_Scope) {
|
|
return true;
|
|
}
|
|
}));
|
|
};
|
|
|
|
/* -----[ boolean/negation helpers ]----- */
|
|
|
|
// methods to determine whether an expression has a boolean result type
|
|
(function (def){
|
|
var unary_bool = [ "!", "delete" ];
|
|
var binary_bool = [ "in", "instanceof", "==", "!=", "===", "!==", "<", "<=", ">=", ">" ];
|
|
def(Cola.AST_Node, function(){ return false });
|
|
def(Cola.AST_UnaryPrefix, function(){
|
|
return Cola.member(this.operator, unary_bool);
|
|
});
|
|
def(Cola.AST_Binary, function(){
|
|
return Cola.member(this.operator, binary_bool) ||
|
|
( (this.operator == "&&" || this.operator == "||") &&
|
|
this.left.is_boolean() && this.right.is_boolean() );
|
|
});
|
|
def(Cola.AST_Conditional, function(){
|
|
return this.consequent.is_boolean() && this.alternative.is_boolean();
|
|
});
|
|
def(Cola.AST_Assign, function(){
|
|
return this.operator == "=" && this.right.is_boolean();
|
|
});
|
|
def(Cola.AST_Seq, function(){
|
|
return this.cdr.is_boolean();
|
|
});
|
|
def(Cola.AST_True, function(){ return true });
|
|
def(Cola.AST_False, function(){ return true });
|
|
})(function(node, func){
|
|
node.DEFMETHOD("is_boolean", func);
|
|
});
|
|
|
|
// methods to determine if an expression has a string result type
|
|
(function (def){
|
|
def(Cola.AST_Node, function(){ return false });
|
|
def(Cola.AST_String, function(){ return true });
|
|
def(Cola.AST_UnaryPrefix, function(){
|
|
return this.operator == "typeof";
|
|
});
|
|
def(Cola.AST_Binary, function(compressor){
|
|
return this.operator == "+" &&
|
|
(this.left.is_string(compressor) || this.right.is_string(compressor));
|
|
});
|
|
def(Cola.AST_Assign, function(compressor){
|
|
return (this.operator == "=" || this.operator == "+=") && this.right.is_string(compressor);
|
|
});
|
|
def(Cola.AST_Seq, function(compressor){
|
|
return this.cdr.is_string(compressor);
|
|
});
|
|
def(Cola.AST_Conditional, function(compressor){
|
|
return this.consequent.is_string(compressor) && this.alternative.is_string(compressor);
|
|
});
|
|
def(Cola.AST_Call, function(compressor){
|
|
return compressor.option("unsafe")
|
|
&& this.expression instanceof Cola.AST_SymbolRef
|
|
&& this.expression.name == "String"
|
|
&& this.expression.undeclared();
|
|
});
|
|
})(function(node, func){
|
|
node.DEFMETHOD("is_string", func);
|
|
});
|
|
|
|
function best_of(ast1, ast2) {
|
|
return ast1.print_to_string().length >
|
|
ast2.print_to_string().length
|
|
? ast2 : ast1;
|
|
};
|
|
|
|
// methods to evaluate a constant expression
|
|
(function (def){
|
|
// The evaluate method returns an array with one or two
|
|
// elements. If the node has been successfully reduced to a
|
|
// constant, then the second element tells us the value;
|
|
// otherwise the second element is missing. The first element
|
|
// of the array is always an Cola.AST_Node descendant; if
|
|
// evaluation was successful it's a node that represents the
|
|
// constant; otherwise it's the original or a replacement node.
|
|
Cola.AST_Node.DEFMETHOD("evaluate", function(compressor){
|
|
if (!compressor.option("evaluate")) return [ this ];
|
|
try {
|
|
var val = this._eval(compressor);
|
|
return [ best_of(make_node_from_constant(compressor, val, this), this), val ];
|
|
} catch(ex) {
|
|
if (ex !== def) throw ex;
|
|
return [ this ];
|
|
}
|
|
});
|
|
def(Cola.AST_Statement, function(){
|
|
throw new Error(Cola.string_template("Cannot evaluate a statement [{file}:{line},{col}]", this.start));
|
|
});
|
|
def(Cola.AST_Function, function(){
|
|
// XXX: Cola.AST_Function inherits from Cola.AST_Scope, which itself
|
|
// inherits from Cola.AST_Statement; however, an Cola.AST_Function
|
|
// isn't really a statement. This could byte in other
|
|
// places too. :-( Wish JS had multiple inheritance.
|
|
throw def;
|
|
});
|
|
function ev(node, compressor) {
|
|
if (!compressor) throw new Error("Compressor must be passed");
|
|
|
|
return node._eval(compressor);
|
|
};
|
|
def(Cola.AST_Node, function(){
|
|
throw def; // not constant
|
|
});
|
|
def(Cola.AST_Constant, function(){
|
|
return this.getValue();
|
|
});
|
|
def(Cola.AST_UnaryPrefix, function(compressor){
|
|
var e = this.expression;
|
|
switch (this.operator) {
|
|
case "!": return !ev(e, compressor);
|
|
case "typeof":
|
|
// Function would be evaluated to an array and so typeof would
|
|
// incorrectly return 'object'. Hence making is a special case.
|
|
if (e instanceof Cola.AST_Function) return typeof function(){};
|
|
|
|
e = ev(e, compressor);
|
|
|
|
// typeof <RegExp> returns "object" or "function" on different platforms
|
|
// so cannot evaluate reliably
|
|
if (e instanceof RegExp) throw def;
|
|
|
|
return typeof e;
|
|
case "void": return void ev(e, compressor);
|
|
case "~": return ~ev(e, compressor);
|
|
case "-":
|
|
e = ev(e, compressor);
|
|
if (e === 0) throw def;
|
|
return -e;
|
|
case "+": return +ev(e, compressor);
|
|
}
|
|
throw def;
|
|
});
|
|
def(Cola.AST_Binary, function(c){
|
|
var left = this.left, right = this.right;
|
|
switch (this.operator) {
|
|
case "&&" : return ev(left, c) && ev(right, c);
|
|
case "||" : return ev(left, c) || ev(right, c);
|
|
case "|" : return ev(left, c) | ev(right, c);
|
|
case "&" : return ev(left, c) & ev(right, c);
|
|
case "^" : return ev(left, c) ^ ev(right, c);
|
|
case "+" : return ev(left, c) + ev(right, c);
|
|
case "*" : return ev(left, c) * ev(right, c);
|
|
case "/" : return ev(left, c) / ev(right, c);
|
|
case "%" : return ev(left, c) % ev(right, c);
|
|
case "-" : return ev(left, c) - ev(right, c);
|
|
case "<<" : return ev(left, c) << ev(right, c);
|
|
case ">>" : return ev(left, c) >> ev(right, c);
|
|
case ">>>" : return ev(left, c) >>> ev(right, c);
|
|
case "==" : return ev(left, c) == ev(right, c);
|
|
case "===" : return ev(left, c) === ev(right, c);
|
|
case "!=" : return ev(left, c) != ev(right, c);
|
|
case "!==" : return ev(left, c) !== ev(right, c);
|
|
case "<" : return ev(left, c) < ev(right, c);
|
|
case "<=" : return ev(left, c) <= ev(right, c);
|
|
case ">" : return ev(left, c) > ev(right, c);
|
|
case ">=" : return ev(left, c) >= ev(right, c);
|
|
case "in" : return ev(left, c) in ev(right, c);
|
|
case "instanceof" : return ev(left, c) instanceof ev(right, c);
|
|
}
|
|
throw def;
|
|
});
|
|
def(Cola.AST_Conditional, function(compressor){
|
|
return ev(this.condition, compressor)
|
|
? ev(this.consequent, compressor)
|
|
: ev(this.alternative, compressor);
|
|
});
|
|
def(Cola.AST_SymbolRef, function(compressor){
|
|
var d = this.definition();
|
|
if (d && d.constant && d.init) return ev(d.init, compressor);
|
|
throw def;
|
|
});
|
|
})(function(node, func){
|
|
node.DEFMETHOD("_eval", func);
|
|
});
|
|
|
|
// method to negate an expression
|
|
(function(def){
|
|
function basic_negation(exp) {
|
|
return make_node(Cola.AST_UnaryPrefix, exp, {
|
|
operator: "!",
|
|
expression: exp
|
|
});
|
|
};
|
|
def(Cola.AST_Node, function(){
|
|
return basic_negation(this);
|
|
});
|
|
def(Cola.AST_Statement, function(){
|
|
throw new Error("Cannot negate a statement");
|
|
});
|
|
def(Cola.AST_Function, function(){
|
|
return basic_negation(this);
|
|
});
|
|
def(Cola.AST_UnaryPrefix, function(){
|
|
if (this.operator == "!")
|
|
return this.expression;
|
|
return basic_negation(this);
|
|
});
|
|
def(Cola.AST_Seq, function(compressor){
|
|
var self = this.clone();
|
|
self.cdr = self.cdr.negate(compressor);
|
|
return self;
|
|
});
|
|
def(Cola.AST_Conditional, function(compressor){
|
|
var self = this.clone();
|
|
self.consequent = self.consequent.negate(compressor);
|
|
self.alternative = self.alternative.negate(compressor);
|
|
return best_of(basic_negation(this), self);
|
|
});
|
|
def(Cola.AST_Binary, function(compressor){
|
|
var self = this.clone(), op = this.operator;
|
|
if (compressor.option("unsafe_comps")) {
|
|
switch (op) {
|
|
case "<=" : self.operator = ">" ; return self;
|
|
case "<" : self.operator = ">=" ; return self;
|
|
case ">=" : self.operator = "<" ; return self;
|
|
case ">" : self.operator = "<=" ; return self;
|
|
}
|
|
}
|
|
switch (op) {
|
|
case "==" : self.operator = "!="; return self;
|
|
case "!=" : self.operator = "=="; return self;
|
|
case "===": self.operator = "!=="; return self;
|
|
case "!==": self.operator = "==="; return self;
|
|
case "&&":
|
|
self.operator = "||";
|
|
self.left = self.left.negate(compressor);
|
|
self.right = self.right.negate(compressor);
|
|
return best_of(basic_negation(this), self);
|
|
case "||":
|
|
self.operator = "&&";
|
|
self.left = self.left.negate(compressor);
|
|
self.right = self.right.negate(compressor);
|
|
return best_of(basic_negation(this), self);
|
|
}
|
|
return basic_negation(this);
|
|
});
|
|
})(function(node, func){
|
|
node.DEFMETHOD("negate", function(compressor){
|
|
return func.call(this, compressor);
|
|
});
|
|
});
|
|
|
|
// determine if expression has side effects
|
|
(function(def){
|
|
def(Cola.AST_Node, function(compressor){ return true });
|
|
|
|
def(Cola.AST_EmptyStatement, function(compressor){ return false });
|
|
def(Cola.AST_Constant, function(compressor){ return false });
|
|
def(Cola.AST_This, function(compressor){ return false });
|
|
|
|
def(Cola.AST_Call, function(compressor){
|
|
var pure = compressor.option("pure_funcs");
|
|
if (!pure) return true;
|
|
return pure.indexOf(this.expression.print_to_string()) < 0;
|
|
});
|
|
|
|
def(Cola.AST_Block, function(compressor){
|
|
for (var i = this.body.length; --i >= 0;) {
|
|
if (this.body[i].has_side_effects(compressor))
|
|
return true;
|
|
}
|
|
return false;
|
|
});
|
|
|
|
def(Cola.AST_SimpleStatement, function(compressor){
|
|
return this.body.has_side_effects(compressor);
|
|
});
|
|
def(Cola.AST_Defun, function(compressor){ return true });
|
|
def(Cola.AST_Function, function(compressor){ return false });
|
|
def(Cola.AST_Binary, function(compressor){
|
|
return this.left.has_side_effects(compressor)
|
|
|| this.right.has_side_effects(compressor);
|
|
});
|
|
def(Cola.AST_Assign, function(compressor){ return true });
|
|
def(Cola.AST_Conditional, function(compressor){
|
|
return this.condition.has_side_effects(compressor)
|
|
|| this.consequent.has_side_effects(compressor)
|
|
|| this.alternative.has_side_effects(compressor);
|
|
});
|
|
def(Cola.AST_Unary, function(compressor){
|
|
return this.operator == "delete"
|
|
|| this.operator == "++"
|
|
|| this.operator == "--"
|
|
|| this.expression.has_side_effects(compressor);
|
|
});
|
|
def(Cola.AST_SymbolRef, function(compressor){ return false });
|
|
def(Cola.AST_Object, function(compressor){
|
|
for (var i = this.properties.length; --i >= 0;)
|
|
if (this.properties[i].has_side_effects(compressor))
|
|
return true;
|
|
return false;
|
|
});
|
|
def(Cola.AST_ObjectProperty, function(compressor){
|
|
return this.value.has_side_effects(compressor);
|
|
});
|
|
def(Cola.AST_Array, function(compressor){
|
|
for (var i = this.elements.length; --i >= 0;)
|
|
if (this.elements[i].has_side_effects(compressor))
|
|
return true;
|
|
return false;
|
|
});
|
|
def(Cola.AST_Dot, function(compressor){
|
|
if (!compressor.option("pure_getters")) return true;
|
|
return this.expression.has_side_effects(compressor);
|
|
});
|
|
def(Cola.AST_Sub, function(compressor){
|
|
if (!compressor.option("pure_getters")) return true;
|
|
return this.expression.has_side_effects(compressor)
|
|
|| this.property.has_side_effects(compressor);
|
|
});
|
|
def(Cola.AST_PropAccess, function(compressor){
|
|
return !compressor.option("pure_getters");
|
|
});
|
|
def(Cola.AST_Seq, function(compressor){
|
|
return this.car.has_side_effects(compressor)
|
|
|| this.cdr.has_side_effects(compressor);
|
|
});
|
|
})(function(node, func){
|
|
node.DEFMETHOD("has_side_effects", func);
|
|
});
|
|
|
|
// tell me if a statement aborts
|
|
function aborts(thing) {
|
|
return thing && thing.aborts();
|
|
};
|
|
(function(def){
|
|
def(Cola.AST_Statement, function(){ return null });
|
|
def(Cola.AST_Jump, function(){ return this });
|
|
function block_aborts(){
|
|
var n = this.body.length;
|
|
return n > 0 && aborts(this.body[n - 1]);
|
|
};
|
|
def(Cola.AST_BlockStatement, block_aborts);
|
|
def(Cola.AST_SwitchBranch, block_aborts);
|
|
def(Cola.AST_If, function(){
|
|
return this.alternative && aborts(this.body) && aborts(this.alternative);
|
|
});
|
|
})(function(node, func){
|
|
node.DEFMETHOD("aborts", func);
|
|
});
|
|
|
|
/* -----[ optimizers ]----- */
|
|
|
|
OPT(Cola.AST_Directive, function(self, compressor){
|
|
if (self.scope.has_directive(self.value) !== self.scope) {
|
|
return make_node(Cola.AST_EmptyStatement, self);
|
|
}
|
|
return self;
|
|
});
|
|
|
|
OPT(Cola.AST_Debugger, function(self, compressor){
|
|
if (compressor.option("drop_debugger"))
|
|
return make_node(Cola.AST_EmptyStatement, self);
|
|
return self;
|
|
});
|
|
|
|
OPT(Cola.AST_LabeledStatement, function(self, compressor){
|
|
if (self.body instanceof Cola.AST_Break
|
|
&& compressor.loopcontrol_target(self.body.label) === self.body) {
|
|
return make_node(Cola.AST_EmptyStatement, self);
|
|
}
|
|
return self.label.references.length == 0 ? self.body : self;
|
|
});
|
|
|
|
OPT(Cola.AST_Block, function(self, compressor){
|
|
self.body = tighten_body(self.body, compressor);
|
|
return self;
|
|
});
|
|
|
|
OPT(Cola.AST_BlockStatement, function(self, compressor){
|
|
self.body = tighten_body(self.body, compressor);
|
|
switch (self.body.length) {
|
|
case 1: return self.body[0];
|
|
case 0: return make_node(Cola.AST_EmptyStatement, self);
|
|
}
|
|
return self;
|
|
});
|
|
|
|
Cola.AST_Scope.DEFMETHOD("drop_unused", function(compressor){
|
|
var self = this;
|
|
if (compressor.option("unused")
|
|
&& !(self instanceof Cola.AST_Toplevel)
|
|
&& !self.uses_eval
|
|
) {
|
|
var in_use = [];
|
|
var initializations = new Cola.Dictionary();
|
|
// pass 1: find out which symbols are directly used in
|
|
// this scope (not in nested scopes).
|
|
var scope = this;
|
|
var tw = new Cola.TreeWalker(function(node, descend){
|
|
if (node !== self) {
|
|
if (node instanceof Cola.AST_Defun) {
|
|
initializations.add(node.name.name, node);
|
|
return true; // don't go in nested scopes
|
|
}
|
|
if (node instanceof Cola.AST_Definitions && scope === self) {
|
|
node.definitions.forEach(function(def){
|
|
if (def.value) {
|
|
initializations.add(def.name.name, def.value);
|
|
if (def.value.has_side_effects(compressor)) {
|
|
def.value.walk(tw);
|
|
}
|
|
}
|
|
});
|
|
return true;
|
|
}
|
|
if (node instanceof Cola.AST_SymbolRef) {
|
|
Cola.push_uniq(in_use, node.definition());
|
|
return true;
|
|
}
|
|
if (node instanceof Cola.AST_Scope) {
|
|
var save_scope = scope;
|
|
scope = node;
|
|
descend();
|
|
scope = save_scope;
|
|
return true;
|
|
}
|
|
}
|
|
});
|
|
self.walk(tw);
|
|
// pass 2: for every used symbol we need to walk its
|
|
// initialization code to figure out if it uses other
|
|
// symbols (that may not be in_use).
|
|
for (var i = 0; i < in_use.length; ++i) {
|
|
in_use[i].orig.forEach(function(decl){
|
|
// undeclared globals will be instanceof Cola.AST_SymbolRef
|
|
var init = initializations.get(decl.name);
|
|
if (init) init.forEach(function(init){
|
|
var tw = new Cola.TreeWalker(function(node){
|
|
if (node instanceof Cola.AST_SymbolRef) {
|
|
Cola.push_uniq(in_use, node.definition());
|
|
}
|
|
});
|
|
init.walk(tw);
|
|
});
|
|
});
|
|
}
|
|
// pass 3: we should drop declarations not in_use
|
|
var tt = new Cola.TreeTransformer(
|
|
function before(node, descend, in_list) {
|
|
if (node instanceof Cola.AST_Lambda && !(node instanceof Cola.AST_Accessor)) {
|
|
if (!compressor.option("keep_fargs")) {
|
|
for (var a = node.argnames, i = a.length; --i >= 0;) {
|
|
var sym = a[i];
|
|
if (sym.unreferenced()) {
|
|
a.pop();
|
|
compressor.warn("Dropping unused function argument {name} [{file}:{line},{col}]", {
|
|
name : sym.name,
|
|
file : sym.start.file,
|
|
line : sym.start.line,
|
|
col : sym.start.col
|
|
});
|
|
}
|
|
else break;
|
|
}
|
|
}
|
|
}
|
|
if (node instanceof Cola.AST_Defun && node !== self) {
|
|
if (!Cola.member(node.name.definition(), in_use)) {
|
|
compressor.warn("Dropping unused function {name} [{file}:{line},{col}]", {
|
|
name : node.name.name,
|
|
file : node.name.start.file,
|
|
line : node.name.start.line,
|
|
col : node.name.start.col
|
|
});
|
|
return make_node(Cola.AST_EmptyStatement, node);
|
|
}
|
|
return node;
|
|
}
|
|
if (node instanceof Cola.AST_Definitions && !(tt.parent() instanceof Cola.AST_ForIn)) {
|
|
var def = node.definitions.filter(function(def){
|
|
if (Cola.member(def.name.definition(), in_use)) return true;
|
|
var w = {
|
|
name : def.name.name,
|
|
file : def.name.start.file,
|
|
line : def.name.start.line,
|
|
col : def.name.start.col
|
|
};
|
|
if (def.value && def.value.has_side_effects(compressor)) {
|
|
def._unused_side_effects = true;
|
|
compressor.warn("Side effects in initialization of unused variable {name} [{file}:{line},{col}]", w);
|
|
return true;
|
|
}
|
|
compressor.warn("Dropping unused variable {name} [{file}:{line},{col}]", w);
|
|
return false;
|
|
});
|
|
// place uninitialized names at the start
|
|
def = Cola.mergeSort(def, function(a, b){
|
|
if (!a.value && b.value) return -1;
|
|
if (!b.value && a.value) return 1;
|
|
return 0;
|
|
});
|
|
// for unused names whose initialization has
|
|
// side effects, we can cascade the init. code
|
|
// into the next one, or next statement.
|
|
var side_effects = [];
|
|
for (var i = 0; i < def.length;) {
|
|
var x = def[i];
|
|
if (x._unused_side_effects) {
|
|
side_effects.push(x.value);
|
|
def.splice(i, 1);
|
|
} else {
|
|
if (side_effects.length > 0) {
|
|
side_effects.push(x.value);
|
|
x.value = Cola.AST_Seq.from_array(side_effects);
|
|
side_effects = [];
|
|
}
|
|
++i;
|
|
}
|
|
}
|
|
if (side_effects.length > 0) {
|
|
side_effects = make_node(Cola.AST_BlockStatement, node, {
|
|
body: [ make_node(Cola.AST_SimpleStatement, node, {
|
|
body: Cola.AST_Seq.from_array(side_effects)
|
|
}) ]
|
|
});
|
|
} else {
|
|
side_effects = null;
|
|
}
|
|
if (def.length == 0 && !side_effects) {
|
|
return make_node(Cola.AST_EmptyStatement, node);
|
|
}
|
|
if (def.length == 0) {
|
|
return side_effects;
|
|
}
|
|
node.definitions = def;
|
|
if (side_effects) {
|
|
side_effects.body.unshift(node);
|
|
node = side_effects;
|
|
}
|
|
return node;
|
|
}
|
|
if (node instanceof Cola.AST_For) {
|
|
descend(node, this);
|
|
|
|
if (node.init instanceof Cola.AST_BlockStatement) {
|
|
// certain combination of unused name + side effect leads to:
|
|
// https://github.com/mishoo/UglifyJS2/issues/44
|
|
// that's an invalid AST.
|
|
// We fix it at this stage by moving the `var` outside the `for`.
|
|
|
|
var body = node.init.body.slice(0, -1);
|
|
node.init = node.init.body.slice(-1)[0].body;
|
|
body.push(node);
|
|
|
|
return in_list ? Cola.MAP.splice(body) : make_node(Cola.AST_BlockStatement, node, {
|
|
body: body
|
|
});
|
|
}
|
|
}
|
|
if (node instanceof Cola.AST_Scope && node !== self)
|
|
return node;
|
|
}
|
|
);
|
|
self.transform(tt);
|
|
}
|
|
});
|
|
|
|
Cola.AST_Scope.DEFMETHOD("hoist_declarations", function(compressor){
|
|
var hoist_funs = compressor.option("hoist_funs");
|
|
var hoist_vars = compressor.option("hoist_vars");
|
|
var self = this;
|
|
if (hoist_funs || hoist_vars) {
|
|
var dirs = [];
|
|
var hoisted = [];
|
|
var vars = new Cola.Dictionary(), vars_found = 0, var_decl = 0;
|
|
// let's count var_decl first, we seem to waste a lot of
|
|
// space if we hoist `var` when there's only one.
|
|
self.walk(new Cola.TreeWalker(function(node){
|
|
if (node instanceof Cola.AST_Scope && node !== self)
|
|
return true;
|
|
if (node instanceof Cola.AST_Var) {
|
|
++var_decl;
|
|
return true;
|
|
}
|
|
}));
|
|
hoist_vars = hoist_vars && var_decl > 1;
|
|
var tt = new Cola.TreeTransformer(
|
|
function before(node) {
|
|
if (node !== self) {
|
|
if (node instanceof Cola.AST_Directive) {
|
|
dirs.push(node);
|
|
return make_node(Cola.AST_EmptyStatement, node);
|
|
}
|
|
if (node instanceof Cola.AST_Defun && hoist_funs) {
|
|
hoisted.push(node);
|
|
return make_node(Cola.AST_EmptyStatement, node);
|
|
}
|
|
if (node instanceof Cola.AST_Var && hoist_vars) {
|
|
node.definitions.forEach(function(def){
|
|
vars.set(def.name.name, def);
|
|
++vars_found;
|
|
});
|
|
var seq = node.to_assignments();
|
|
var p = tt.parent();
|
|
if (p instanceof Cola.AST_ForIn && p.init === node) {
|
|
if (seq == null) return node.definitions[0].name;
|
|
return seq;
|
|
}
|
|
if (p instanceof Cola.AST_For && p.init === node) {
|
|
return seq;
|
|
}
|
|
if (!seq) return make_node(Cola.AST_EmptyStatement, node);
|
|
return make_node(Cola.AST_SimpleStatement, node, {
|
|
body: seq
|
|
});
|
|
}
|
|
if (node instanceof Cola.AST_Scope)
|
|
return node; // to avoid descending in nested scopes
|
|
}
|
|
}
|
|
);
|
|
self = self.transform(tt);
|
|
if (vars_found > 0) {
|
|
// collect only vars which don't show up in self's arguments list
|
|
var defs = [];
|
|
vars.each(function(def, name){
|
|
if (self instanceof Cola.AST_Lambda
|
|
&& Cola.find_if(function(x){ return x.name == def.name.name },
|
|
self.argnames)) {
|
|
vars.del(name);
|
|
} else {
|
|
def = def.clone();
|
|
def.value = null;
|
|
defs.push(def);
|
|
vars.set(name, def);
|
|
}
|
|
});
|
|
if (defs.length > 0) {
|
|
// try to merge in assignments
|
|
for (var i = 0; i < self.body.length;) {
|
|
if (self.body[i] instanceof Cola.AST_SimpleStatement) {
|
|
var expr = self.body[i].body, sym, assign;
|
|
if (expr instanceof Cola.AST_Assign
|
|
&& expr.operator == "="
|
|
&& (sym = expr.left) instanceof Cola.AST_Symbol
|
|
&& vars.has(sym.name))
|
|
{
|
|
var def = vars.get(sym.name);
|
|
if (def.value) break;
|
|
def.value = expr.right;
|
|
Cola.remove(defs, def);
|
|
defs.push(def);
|
|
self.body.splice(i, 1);
|
|
continue;
|
|
}
|
|
if (expr instanceof Cola.AST_Seq
|
|
&& (assign = expr.car) instanceof Cola.AST_Assign
|
|
&& assign.operator == "="
|
|
&& (sym = assign.left) instanceof Cola.AST_Symbol
|
|
&& vars.has(sym.name))
|
|
{
|
|
var def = vars.get(sym.name);
|
|
if (def.value) break;
|
|
def.value = assign.right;
|
|
Cola.remove(defs, def);
|
|
defs.push(def);
|
|
self.body[i].body = expr.cdr;
|
|
continue;
|
|
}
|
|
}
|
|
if (self.body[i] instanceof Cola.AST_EmptyStatement) {
|
|
self.body.splice(i, 1);
|
|
continue;
|
|
}
|
|
if (self.body[i] instanceof Cola.AST_BlockStatement) {
|
|
var tmp = [ i, 1 ].concat(self.body[i].body);
|
|
self.body.splice.apply(self.body, tmp);
|
|
continue;
|
|
}
|
|
break;
|
|
}
|
|
defs = make_node(Cola.AST_Var, self, {
|
|
definitions: defs
|
|
});
|
|
hoisted.push(defs);
|
|
};
|
|
}
|
|
self.body = dirs.concat(hoisted, self.body);
|
|
}
|
|
return self;
|
|
});
|
|
|
|
OPT(Cola.AST_SimpleStatement, function(self, compressor){
|
|
if (compressor.option("side_effects")) {
|
|
if (!self.body.has_side_effects(compressor)) {
|
|
compressor.warn("Dropping side-effect-free statement [{file}:{line},{col}]", self.start);
|
|
return make_node(Cola.AST_EmptyStatement, self);
|
|
}
|
|
}
|
|
return self;
|
|
});
|
|
|
|
OPT(Cola.AST_DWLoop, function(self, compressor){
|
|
var cond = self.condition.evaluate(compressor);
|
|
self.condition = cond[0];
|
|
if (!compressor.option("loops")) return self;
|
|
if (cond.length > 1) {
|
|
if (cond[1]) {
|
|
return make_node(Cola.AST_For, self, {
|
|
body: self.body
|
|
});
|
|
} else if (self instanceof Cola.AST_While) {
|
|
if (compressor.option("dead_code")) {
|
|
var a = [];
|
|
extract_declarations_from_unreachable_code(compressor, self.body, a);
|
|
return make_node(Cola.AST_BlockStatement, self, { body: a });
|
|
}
|
|
}
|
|
}
|
|
return self;
|
|
});
|
|
|
|
function if_break_in_loop(self, compressor) {
|
|
function drop_it(rest) {
|
|
rest = as_statement_array(rest);
|
|
if (self.body instanceof Cola.AST_BlockStatement) {
|
|
self.body = self.body.clone();
|
|
self.body.body = rest.concat(self.body.body.slice(1));
|
|
self.body = self.body.transform(compressor);
|
|
} else {
|
|
self.body = make_node(Cola.AST_BlockStatement, self.body, {
|
|
body: rest
|
|
}).transform(compressor);
|
|
}
|
|
if_break_in_loop(self, compressor);
|
|
}
|
|
var first = self.body instanceof Cola.AST_BlockStatement ? self.body.body[0] : self.body;
|
|
if (first instanceof Cola.AST_If) {
|
|
if (first.body instanceof Cola.AST_Break
|
|
&& compressor.loopcontrol_target(first.body.label) === self) {
|
|
if (self.condition) {
|
|
self.condition = make_node(Cola.AST_Binary, self.condition, {
|
|
left: self.condition,
|
|
operator: "&&",
|
|
right: first.condition.negate(compressor),
|
|
});
|
|
} else {
|
|
self.condition = first.condition.negate(compressor);
|
|
}
|
|
drop_it(first.alternative);
|
|
}
|
|
else if (first.alternative instanceof Cola.AST_Break
|
|
&& compressor.loopcontrol_target(first.alternative.label) === self) {
|
|
if (self.condition) {
|
|
self.condition = make_node(Cola.AST_Binary, self.condition, {
|
|
left: self.condition,
|
|
operator: "&&",
|
|
right: first.condition,
|
|
});
|
|
} else {
|
|
self.condition = first.condition;
|
|
}
|
|
drop_it(first.body);
|
|
}
|
|
}
|
|
};
|
|
|
|
OPT(Cola.AST_While, function(self, compressor) {
|
|
if (!compressor.option("loops")) return self;
|
|
self = Cola.AST_DWLoop.prototype.optimize.call(self, compressor);
|
|
if (self instanceof Cola.AST_While) {
|
|
if_break_in_loop(self, compressor);
|
|
self = make_node(Cola.AST_For, self, self).transform(compressor);
|
|
}
|
|
return self;
|
|
});
|
|
|
|
OPT(Cola.AST_For, function(self, compressor){
|
|
var cond = self.condition;
|
|
if (cond) {
|
|
cond = cond.evaluate(compressor);
|
|
self.condition = cond[0];
|
|
}
|
|
if (!compressor.option("loops")) return self;
|
|
if (cond) {
|
|
if (cond.length > 1 && !cond[1]) {
|
|
if (compressor.option("dead_code")) {
|
|
var a = [];
|
|
if (self.init instanceof Cola.AST_Statement) {
|
|
a.push(self.init);
|
|
}
|
|
else if (self.init) {
|
|
a.push(make_node(Cola.AST_SimpleStatement, self.init, {
|
|
body: self.init
|
|
}));
|
|
}
|
|
extract_declarations_from_unreachable_code(compressor, self.body, a);
|
|
return make_node(Cola.AST_BlockStatement, self, { body: a });
|
|
}
|
|
}
|
|
}
|
|
if_break_in_loop(self, compressor);
|
|
return self;
|
|
});
|
|
|
|
OPT(Cola.AST_If, function(self, compressor){
|
|
if (!compressor.option("conditionals")) return self;
|
|
// if condition can be statically determined, warn and drop
|
|
// one of the blocks. note, statically determined implies
|
|
// “has no side effects”; also it doesn't work for cases like
|
|
// `x && true`, though it probably should.
|
|
var cond = self.condition.evaluate(compressor);
|
|
self.condition = cond[0];
|
|
if (cond.length > 1) {
|
|
if (cond[1]) {
|
|
compressor.warn("Condition always true [{file}:{line},{col}]", self.condition.start);
|
|
if (compressor.option("dead_code")) {
|
|
var a = [];
|
|
if (self.alternative) {
|
|
extract_declarations_from_unreachable_code(compressor, self.alternative, a);
|
|
}
|
|
a.push(self.body);
|
|
return make_node(Cola.AST_BlockStatement, self, { body: a }).transform(compressor);
|
|
}
|
|
} else {
|
|
compressor.warn("Condition always false [{file}:{line},{col}]", self.condition.start);
|
|
if (compressor.option("dead_code")) {
|
|
var a = [];
|
|
extract_declarations_from_unreachable_code(compressor, self.body, a);
|
|
if (self.alternative) a.push(self.alternative);
|
|
return make_node(Cola.AST_BlockStatement, self, { body: a }).transform(compressor);
|
|
}
|
|
}
|
|
}
|
|
if (is_empty(self.alternative)) self.alternative = null;
|
|
var negated = self.condition.negate(compressor);
|
|
var negated_is_best = best_of(self.condition, negated) === negated;
|
|
if (self.alternative && negated_is_best) {
|
|
negated_is_best = false; // because we already do the switch here.
|
|
self.condition = negated;
|
|
var tmp = self.body;
|
|
self.body = self.alternative || make_node(Cola.AST_EmptyStatement);
|
|
self.alternative = tmp;
|
|
}
|
|
if (is_empty(self.body) && is_empty(self.alternative)) {
|
|
return make_node(Cola.AST_SimpleStatement, self.condition, {
|
|
body: self.condition
|
|
}).transform(compressor);
|
|
}
|
|
if (self.body instanceof Cola.AST_SimpleStatement
|
|
&& self.alternative instanceof Cola.AST_SimpleStatement) {
|
|
return make_node(Cola.AST_SimpleStatement, self, {
|
|
body: make_node(Cola.AST_Conditional, self, {
|
|
condition : self.condition,
|
|
consequent : self.body.body,
|
|
alternative : self.alternative.body
|
|
})
|
|
}).transform(compressor);
|
|
}
|
|
if (is_empty(self.alternative) && self.body instanceof Cola.AST_SimpleStatement) {
|
|
if (negated_is_best) return make_node(Cola.AST_SimpleStatement, self, {
|
|
body: make_node(Cola.AST_Binary, self, {
|
|
operator : "||",
|
|
left : negated,
|
|
right : self.body.body
|
|
})
|
|
}).transform(compressor);
|
|
return make_node(Cola.AST_SimpleStatement, self, {
|
|
body: make_node(Cola.AST_Binary, self, {
|
|
operator : "&&",
|
|
left : self.condition,
|
|
right : self.body.body
|
|
})
|
|
}).transform(compressor);
|
|
}
|
|
if (self.body instanceof Cola.AST_EmptyStatement
|
|
&& self.alternative
|
|
&& self.alternative instanceof Cola.AST_SimpleStatement) {
|
|
return make_node(Cola.AST_SimpleStatement, self, {
|
|
body: make_node(Cola.AST_Binary, self, {
|
|
operator : "||",
|
|
left : self.condition,
|
|
right : self.alternative.body
|
|
})
|
|
}).transform(compressor);
|
|
}
|
|
if (self.body instanceof Cola.AST_Exit
|
|
&& self.alternative instanceof Cola.AST_Exit
|
|
&& self.body.TYPE == self.alternative.TYPE) {
|
|
return make_node(self.body.CTOR, self, {
|
|
value: make_node(Cola.AST_Conditional, self, {
|
|
condition : self.condition,
|
|
consequent : self.body.value || make_node(Cola.AST_Undefined, self.body).optimize(compressor),
|
|
alternative : self.alternative.value || make_node(Cola.AST_Undefined, self.alternative).optimize(compressor)
|
|
})
|
|
}).transform(compressor);
|
|
}
|
|
if (self.body instanceof Cola.AST_If
|
|
&& !self.body.alternative
|
|
&& !self.alternative) {
|
|
self.condition = make_node(Cola.AST_Binary, self.condition, {
|
|
operator: "&&",
|
|
left: self.condition,
|
|
right: self.body.condition
|
|
}).transform(compressor);
|
|
self.body = self.body.body;
|
|
}
|
|
if (aborts(self.body)) {
|
|
if (self.alternative) {
|
|
var alt = self.alternative;
|
|
self.alternative = null;
|
|
return make_node(Cola.AST_BlockStatement, self, {
|
|
body: [ self, alt ]
|
|
}).transform(compressor);
|
|
}
|
|
}
|
|
if (aborts(self.alternative)) {
|
|
var body = self.body;
|
|
self.body = self.alternative;
|
|
self.condition = negated_is_best ? negated : self.condition.negate(compressor);
|
|
self.alternative = null;
|
|
return make_node(Cola.AST_BlockStatement, self, {
|
|
body: [ self, body ]
|
|
}).transform(compressor);
|
|
}
|
|
return self;
|
|
});
|
|
|
|
OPT(Cola.AST_Switch, function(self, compressor){
|
|
if (self.body.length == 0 && compressor.option("conditionals")) {
|
|
return make_node(Cola.AST_SimpleStatement, self, {
|
|
body: self.expression
|
|
}).transform(compressor);
|
|
}
|
|
for(;;) {
|
|
var last_branch = self.body[self.body.length - 1];
|
|
if (last_branch) {
|
|
var stat = last_branch.body[last_branch.body.length - 1]; // last statement
|
|
if (stat instanceof Cola.AST_Break && loop_body(compressor.loopcontrol_target(stat.label)) === self)
|
|
last_branch.body.pop();
|
|
if (last_branch instanceof Cola.AST_Default && last_branch.body.length == 0) {
|
|
self.body.pop();
|
|
continue;
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
var exp = self.expression.evaluate(compressor);
|
|
out: if (exp.length == 2) try {
|
|
// constant expression
|
|
self.expression = exp[0];
|
|
if (!compressor.option("dead_code")) break out;
|
|
var value = exp[1];
|
|
var in_if = false;
|
|
var in_block = false;
|
|
var started = false;
|
|
var stopped = false;
|
|
var ruined = false;
|
|
var tt = new Cola.TreeTransformer(function(node, descend, in_list){
|
|
if (node instanceof Cola.AST_Lambda || node instanceof Cola.AST_SimpleStatement) {
|
|
// no need to descend these node types
|
|
return node;
|
|
}
|
|
else if (node instanceof Cola.AST_Switch && node === self) {
|
|
node = node.clone();
|
|
descend(node, this);
|
|
return ruined ? node : make_node(Cola.AST_BlockStatement, node, {
|
|
body: node.body.reduce(function(a, branch){
|
|
return a.concat(branch.body);
|
|
}, [])
|
|
}).transform(compressor);
|
|
}
|
|
else if (node instanceof Cola.AST_If || node instanceof Cola.AST_Try) {
|
|
var save = in_if;
|
|
in_if = !in_block;
|
|
descend(node, this);
|
|
in_if = save;
|
|
return node;
|
|
}
|
|
else if (node instanceof Cola.AST_StatementWithBody || node instanceof Cola.AST_Switch) {
|
|
var save = in_block;
|
|
in_block = true;
|
|
descend(node, this);
|
|
in_block = save;
|
|
return node;
|
|
}
|
|
else if (node instanceof Cola.AST_Break && this.loopcontrol_target(node.label) === self) {
|
|
if (in_if) {
|
|
ruined = true;
|
|
return node;
|
|
}
|
|
if (in_block) return node;
|
|
stopped = true;
|
|
return in_list ? Cola.MAP.skip : make_node(Cola.AST_EmptyStatement, node);
|
|
}
|
|
else if (node instanceof Cola.AST_SwitchBranch && this.parent() === self) {
|
|
if (stopped) return Cola.MAP.skip;
|
|
if (node instanceof Cola.AST_Case) {
|
|
var exp = node.expression.evaluate(compressor);
|
|
if (exp.length < 2) {
|
|
// got a case with non-constant expression, baling out
|
|
throw self;
|
|
}
|
|
if (exp[1] === value || started) {
|
|
started = true;
|
|
if (aborts(node)) stopped = true;
|
|
descend(node, this);
|
|
return node;
|
|
}
|
|
return Cola.MAP.skip;
|
|
}
|
|
descend(node, this);
|
|
return node;
|
|
}
|
|
});
|
|
tt.stack = compressor.stack.slice(); // so that's able to see parent nodes
|
|
self = self.transform(tt);
|
|
} catch(ex) {
|
|
if (ex !== self) throw ex;
|
|
}
|
|
return self;
|
|
});
|
|
|
|
OPT(Cola.AST_Case, function(self, compressor){
|
|
self.body = tighten_body(self.body, compressor);
|
|
return self;
|
|
});
|
|
|
|
OPT(Cola.AST_Try, function(self, compressor){
|
|
self.body = tighten_body(self.body, compressor);
|
|
return self;
|
|
});
|
|
|
|
Cola.AST_Definitions.DEFMETHOD("remove_initializers", function(){
|
|
this.definitions.forEach(function(def){ def.value = null });
|
|
});
|
|
|
|
Cola.AST_Definitions.DEFMETHOD("to_assignments", function(){
|
|
var assignments = this.definitions.reduce(function(a, def){
|
|
if (def.value) {
|
|
var name = make_node(Cola.AST_SymbolRef, def.name, def.name);
|
|
a.push(make_node(Cola.AST_Assign, def, {
|
|
operator : "=",
|
|
left : name,
|
|
right : def.value
|
|
}));
|
|
}
|
|
return a;
|
|
}, []);
|
|
if (assignments.length == 0) return null;
|
|
return Cola.AST_Seq.from_array(assignments);
|
|
});
|
|
|
|
OPT(Cola.AST_Definitions, function(self, compressor){
|
|
if (self.definitions.length == 0)
|
|
return make_node(Cola.AST_EmptyStatement, self);
|
|
return self;
|
|
});
|
|
|
|
OPT(Cola.AST_Function, function(self, compressor){
|
|
self = Cola.AST_Lambda.prototype.optimize.call(self, compressor);
|
|
if (compressor.option("unused")) {
|
|
if (self.name && self.name.unreferenced()) {
|
|
self.name = null;
|
|
}
|
|
}
|
|
return self;
|
|
});
|
|
|
|
OPT(Cola.AST_Call, function(self, compressor){
|
|
if (compressor.option("evaluate")) {
|
|
if (self.expression instanceof Cola.AST_Dot && Cola.Compressor.MathFuncs[self.expression.property] &&
|
|
self.expression.expression instanceof Cola.AST_SymbolRef && self.expression.expression.name == "Math") {
|
|
var args = [], allstatic = true, val;
|
|
self.args.some(function(arg){
|
|
if(arg instanceof Cola.AST_Constant) args.push(arg.value);
|
|
else return !(allstatic = false);
|
|
});
|
|
if (allstatic) {
|
|
val = Math[self.expression.property].apply({}, args);
|
|
if((""+val).length <= 15) return make_node(Cola.AST_Number, self, { value : val }).transform(compressor);
|
|
}
|
|
} else
|
|
|
|
if (!compressor.option("is_js") && self.expression instanceof Cola.AST_SymbolRef && Cola.Compressor.StdFuncs[self.expression.name] && self.args[0] instanceof Cola.AST_Constant) {
|
|
if (self.expression.name == "_ColaRuntime$$modulo" && self.args[1] instanceof Cola.AST_Constant)
|
|
return make_node(Cola.AST_Number, self, { value : Cola._ColaRuntime$$modulo(self.args[0].value, self.args[1].value) }).transform(compressor);
|
|
}
|
|
}
|
|
if (compressor.option("unsafe")) {
|
|
var exp = self.expression;
|
|
if (exp instanceof Cola.AST_SymbolRef && exp.undeclared()) {
|
|
switch (exp.name) {
|
|
case "Array":
|
|
if (self.args.length != 1) {
|
|
return make_node(Cola.AST_Array, self, {
|
|
elements: self.args
|
|
}).transform(compressor);
|
|
}
|
|
break;
|
|
case "Object":
|
|
if (self.args.length == 0) {
|
|
return make_node(Cola.AST_Object, self, {
|
|
properties: []
|
|
});
|
|
}
|
|
break;
|
|
case "String":
|
|
if (self.args.length == 0) return make_node(Cola.AST_String, self, {
|
|
value: ""
|
|
});
|
|
if (self.args.length <= 1) return make_node(Cola.AST_Binary, self, {
|
|
left: self.args[0],
|
|
operator: "+",
|
|
right: make_node(Cola.AST_String, self, { value: "" })
|
|
}).transform(compressor);
|
|
break;
|
|
case "Number":
|
|
if (self.args.length == 0) return make_node(Cola.AST_Number, self, {
|
|
value: 0
|
|
});
|
|
if (self.args.length == 1) return make_node(Cola.AST_UnaryPrefix, self, {
|
|
expression: self.args[0],
|
|
operator: "+"
|
|
}).transform(compressor);
|
|
case "Boolean":
|
|
if (self.args.length == 0) return make_node(Cola.AST_False, self);
|
|
if (self.args.length == 1) return make_node(Cola.AST_UnaryPrefix, self, {
|
|
expression: make_node(Cola.AST_UnaryPrefix, null, {
|
|
expression: self.args[0],
|
|
operator: "!"
|
|
}),
|
|
operator: "!"
|
|
}).transform(compressor);
|
|
break;
|
|
case "Function":
|
|
if (Cola.all(self.args, function(x){ return x instanceof Cola.AST_String })) {
|
|
// quite a corner-case, but we can handle it:
|
|
// https://github.com/mishoo/UglifyJS2/issues/203
|
|
// if the code argument is a constant, then we can minify it.
|
|
try {
|
|
var code = "(function(" + self.args.slice(0, -1).map(function(arg){
|
|
return arg.value;
|
|
}).join(",") + "){" + self.args[self.args.length - 1].value + "})()";
|
|
var ast = Cola.parse(code);
|
|
ast.figure_out_scope({ screw_ie8: compressor.option("screw_ie8") });
|
|
var comp = new Cola.Compressor(compressor.options);
|
|
ast = ast.transform(comp);
|
|
ast.figure_out_scope({ screw_ie8: compressor.option("screw_ie8") });
|
|
ast.mangle_names();
|
|
var fun;
|
|
try {
|
|
ast.walk(new Cola.TreeWalker(function(node){
|
|
if (node instanceof Cola.AST_Lambda) {
|
|
fun = node;
|
|
throw ast;
|
|
}
|
|
}));
|
|
} catch(ex) {
|
|
if (ex !== ast) throw ex;
|
|
};
|
|
var args = fun.argnames.map(function(arg, i){
|
|
return make_node(Cola.AST_String, self.args[i], {
|
|
value: arg.print_to_string()
|
|
});
|
|
});
|
|
var code = new Cola.OutputStream();
|
|
Cola.AST_BlockStatement.prototype._codegen.call(fun, fun, code);
|
|
code = code.toString().replace(/^\{|\}$/g, "");
|
|
args.push(make_node(Cola.AST_String, self.args[self.args.length - 1], {
|
|
value: code
|
|
}));
|
|
self.args = args;
|
|
return self;
|
|
} catch(ex) {
|
|
if (ex instanceof Cola.JS_Parse_Error) {
|
|
compressor.warn("Error parsing code passed to new Function [{file}:{line},{col}]", self.args[self.args.length - 1].start);
|
|
compressor.warn(ex.toString());
|
|
} else {
|
|
console.log(ex);
|
|
throw ex;
|
|
}
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
else if (exp instanceof Cola.AST_Dot && exp.property == "toString" && self.args.length == 0) {
|
|
return make_node(Cola.AST_Binary, self, {
|
|
left: make_node(Cola.AST_String, self, { value: "" }),
|
|
operator: "+",
|
|
right: exp.expression
|
|
}).transform(compressor);
|
|
}
|
|
else if (exp instanceof Cola.AST_Dot && exp.expression instanceof Cola.AST_Array && exp.property == "join") EXIT: {
|
|
var separator = self.args.length == 0 ? "," : self.args[0].evaluate(compressor)[1];
|
|
if (separator == null) break EXIT; // not a constant
|
|
var elements = exp.expression.elements.reduce(function(a, el){
|
|
el = el.evaluate(compressor);
|
|
if (a.length == 0 || el.length == 1) {
|
|
a.push(el);
|
|
} else {
|
|
var last = a[a.length - 1];
|
|
if (last.length == 2) {
|
|
// it's a constant
|
|
var val = "" + last[1] + separator + el[1];
|
|
a[a.length - 1] = [ make_node_from_constant(compressor, val, last[0]), val ];
|
|
} else {
|
|
a.push(el);
|
|
}
|
|
}
|
|
return a;
|
|
}, []);
|
|
if (elements.length == 0) return make_node(Cola.AST_String, self, { value: "" });
|
|
if (elements.length == 1) return elements[0][0];
|
|
if (separator == "") {
|
|
var first;
|
|
if (elements[0][0] instanceof Cola.AST_String
|
|
|| elements[1][0] instanceof Cola.AST_String) {
|
|
first = elements.shift()[0];
|
|
} else {
|
|
first = make_node(Cola.AST_String, self, { value: "" });
|
|
}
|
|
return elements.reduce(function(prev, el){
|
|
return make_node(Cola.AST_Binary, el[0], {
|
|
operator : "+",
|
|
left : prev,
|
|
right : el[0],
|
|
});
|
|
}, first).transform(compressor);
|
|
}
|
|
// need this awkward cloning to not affect original element
|
|
// best_of will decide which one to get through.
|
|
var node = self.clone();
|
|
node.expression = node.expression.clone();
|
|
node.expression.expression = node.expression.expression.clone();
|
|
node.expression.expression.elements = elements.map(function(el){
|
|
return el[0];
|
|
});
|
|
return best_of(self, node);
|
|
}
|
|
}
|
|
if (compressor.option("side_effects")) {
|
|
if (self.expression instanceof Cola.AST_Function
|
|
&& self.args.length == 0
|
|
&& !Cola.AST_Block.prototype.has_side_effects.call(self.expression, compressor)) {
|
|
return make_node(Cola.AST_Undefined, self).transform(compressor);
|
|
}
|
|
}
|
|
if (compressor.option("drop_console")) {
|
|
if (self.expression instanceof Cola.AST_PropAccess &&
|
|
self.expression.expression instanceof Cola.AST_SymbolRef &&
|
|
self.expression.expression.name == "console" &&
|
|
self.expression.expression.undeclared()) {
|
|
return make_node(Cola.AST_Undefined, self).transform(compressor);
|
|
}
|
|
}
|
|
return self.evaluate(compressor)[0];
|
|
});
|
|
|
|
OPT(Cola.AST_New, function(self, compressor){
|
|
if (compressor.option("unsafe")) {
|
|
var exp = self.expression;
|
|
if (exp instanceof Cola.AST_SymbolRef && exp.undeclared()) {
|
|
switch (exp.name) {
|
|
case "Object":
|
|
case "RegExp":
|
|
case "Function":
|
|
case "Error":
|
|
case "Array":
|
|
return make_node(Cola.AST_Call, self, self).transform(compressor);
|
|
}
|
|
}
|
|
}
|
|
return self;
|
|
});
|
|
|
|
OPT(Cola.AST_Seq, function(self, compressor){
|
|
if (!compressor.option("side_effects"))
|
|
return self;
|
|
if (!self.car.has_side_effects(compressor)) {
|
|
// we shouldn't compress (1,eval)(something) to
|
|
// eval(something) because that changes the meaning of
|
|
// eval (becomes lexical instead of global).
|
|
var p;
|
|
if (!(self.cdr instanceof Cola.AST_SymbolRef
|
|
&& self.cdr.name == "eval"
|
|
&& self.cdr.undeclared()
|
|
&& (p = compressor.parent()) instanceof Cola.AST_Call
|
|
&& p.expression === self)) {
|
|
return self.cdr;
|
|
}
|
|
}
|
|
if (compressor.option("cascade")) {
|
|
if (self.car instanceof Cola.AST_Assign
|
|
&& !self.car.left.has_side_effects(compressor)) {
|
|
if (self.car.left.equivalent_to(self.cdr)) {
|
|
return self.car;
|
|
}
|
|
if (self.cdr instanceof Cola.AST_Call
|
|
&& self.cdr.expression.equivalent_to(self.car.left)) {
|
|
self.cdr.expression = self.car;
|
|
return self.cdr;
|
|
}
|
|
}
|
|
if (!self.car.has_side_effects(compressor)
|
|
&& !self.cdr.has_side_effects(compressor)
|
|
&& self.car.equivalent_to(self.cdr)) {
|
|
return self.car;
|
|
}
|
|
}
|
|
if (self.cdr instanceof Cola.AST_UnaryPrefix
|
|
&& self.cdr.operator == "void"
|
|
&& !self.cdr.expression.has_side_effects(compressor)) {
|
|
self.cdr.operator = self.car;
|
|
return self.cdr;
|
|
}
|
|
if (self.cdr instanceof Cola.AST_Undefined) {
|
|
return make_node(Cola.AST_UnaryPrefix, self, {
|
|
operator : "void",
|
|
expression : self.car
|
|
});
|
|
}
|
|
return self;
|
|
});
|
|
|
|
Cola.AST_Unary.DEFMETHOD("lift_sequences", function(compressor){
|
|
if (compressor.option("sequences")) {
|
|
if (this.expression instanceof Cola.AST_Seq) {
|
|
var seq = this.expression;
|
|
var x = seq.to_array();
|
|
this.expression = x.pop();
|
|
x.push(this);
|
|
seq = Cola.AST_Seq.from_array(x).transform(compressor);
|
|
return seq;
|
|
}
|
|
}
|
|
return this;
|
|
});
|
|
|
|
OPT(Cola.AST_UnaryPostfix, function(self, compressor){
|
|
return self.lift_sequences(compressor);
|
|
});
|
|
|
|
OPT(Cola.AST_UnaryPrefix, function(self, compressor){
|
|
self = self.lift_sequences(compressor);
|
|
var e = self.expression;
|
|
if (compressor.option("booleans") && compressor.in_boolean_context()) {
|
|
switch (self.operator) {
|
|
case "!":
|
|
if (e instanceof Cola.AST_UnaryPrefix && e.operator == "!") {
|
|
// !!foo ==> foo, if we're in boolean context
|
|
return e.expression;
|
|
}
|
|
break;
|
|
case "typeof":
|
|
// typeof always returns a non-empty string, thus it's
|
|
// always true in booleans
|
|
compressor.warn("Boolean expression always true [{file}:{line},{col}]", self.start);
|
|
return make_node(Cola.AST_True, self);
|
|
}
|
|
if (e instanceof Cola.AST_Binary && self.operator == "!") {
|
|
self = best_of(self, e.negate(compressor));
|
|
}
|
|
}
|
|
return self.evaluate(compressor)[0];
|
|
});
|
|
|
|
function has_side_effects_or_prop_access(node, compressor) {
|
|
var save_pure_getters = compressor.option("pure_getters");
|
|
compressor.options.pure_getters = false;
|
|
var ret = node.has_side_effects(compressor);
|
|
compressor.options.pure_getters = save_pure_getters;
|
|
return ret;
|
|
}
|
|
|
|
Cola.AST_Binary.DEFMETHOD("lift_sequences", function(compressor){
|
|
if (compressor.option("sequences")) {
|
|
if (this.left instanceof Cola.AST_Seq) {
|
|
var seq = this.left;
|
|
var x = seq.to_array();
|
|
this.left = x.pop();
|
|
x.push(this);
|
|
seq = Cola.AST_Seq.from_array(x).transform(compressor);
|
|
return seq;
|
|
}
|
|
if (this.right instanceof Cola.AST_Seq
|
|
&& this instanceof Cola.AST_Assign
|
|
&& !has_side_effects_or_prop_access(this.left, compressor)) {
|
|
var seq = this.right;
|
|
var x = seq.to_array();
|
|
this.right = x.pop();
|
|
x.push(this);
|
|
seq = Cola.AST_Seq.from_array(x).transform(compressor);
|
|
return seq;
|
|
}
|
|
}
|
|
return this;
|
|
});
|
|
|
|
var commutativeOperators = Cola.makePredicate("== === != !== * & | ^");
|
|
|
|
OPT(Cola.AST_Binary, function(self, compressor){
|
|
var reverse = compressor.has_directive("use asm") ? Cola.noop
|
|
: function(op, force) {
|
|
if (force || !(self.left.has_side_effects(compressor) || self.right.has_side_effects(compressor))) {
|
|
if (op) self.operator = op;
|
|
var tmp = self.left;
|
|
self.left = self.right;
|
|
self.right = tmp;
|
|
}
|
|
};
|
|
if (commutativeOperators(self.operator)) {
|
|
if (self.right instanceof Cola.AST_Constant
|
|
&& !(self.left instanceof Cola.AST_Constant)) {
|
|
// if right is a constant, whatever side effects the
|
|
// left side might have could not influence the
|
|
// result. hence, force switch.
|
|
|
|
if (!(self.left instanceof Cola.AST_Binary
|
|
&& Cola.PRECEDENCE[self.left.operator] >= Cola.PRECEDENCE[self.operator])) {
|
|
reverse(null, true);
|
|
}
|
|
}
|
|
if (/^[!=]==?$/.test(self.operator)) {
|
|
if (self.left instanceof Cola.AST_SymbolRef && self.right instanceof Cola.AST_Conditional) {
|
|
if (self.right.consequent instanceof Cola.AST_SymbolRef
|
|
&& self.right.consequent.definition() === self.left.definition()) {
|
|
if (/^==/.test(self.operator)) return self.right.condition;
|
|
if (/^!=/.test(self.operator)) return self.right.condition.negate(compressor);
|
|
}
|
|
if (self.right.alternative instanceof Cola.AST_SymbolRef
|
|
&& self.right.alternative.definition() === self.left.definition()) {
|
|
if (/^==/.test(self.operator)) return self.right.condition.negate(compressor);
|
|
if (/^!=/.test(self.operator)) return self.right.condition;
|
|
}
|
|
}
|
|
if (self.right instanceof Cola.AST_SymbolRef && self.left instanceof Cola.AST_Conditional) {
|
|
if (self.left.consequent instanceof Cola.AST_SymbolRef
|
|
&& self.left.consequent.definition() === self.right.definition()) {
|
|
if (/^==/.test(self.operator)) return self.left.condition;
|
|
if (/^!=/.test(self.operator)) return self.left.condition.negate(compressor);
|
|
}
|
|
if (self.left.alternative instanceof Cola.AST_SymbolRef
|
|
&& self.left.alternative.definition() === self.right.definition()) {
|
|
if (/^==/.test(self.operator)) return self.left.condition.negate(compressor);
|
|
if (/^!=/.test(self.operator)) return self.left.condition;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
self = self.lift_sequences(compressor);
|
|
if (compressor.option("comparisons")) switch (self.operator) {
|
|
case "===":
|
|
case "!==":
|
|
if ((self.left.is_string(compressor) && self.right.is_string(compressor)) ||
|
|
(self.left.is_boolean() && self.right.is_boolean())) {
|
|
self.operator = self.operator.substr(0, 2);
|
|
}
|
|
// XXX: intentionally falling down to the next case
|
|
case "==":
|
|
case "!=":
|
|
if (self.left instanceof Cola.AST_String
|
|
&& self.left.value == "undefined"
|
|
&& self.right instanceof Cola.AST_UnaryPrefix
|
|
&& self.right.operator == "typeof"
|
|
&& compressor.option("unsafe")) {
|
|
if (!(self.right.expression instanceof Cola.AST_SymbolRef)
|
|
|| !self.right.expression.undeclared()) {
|
|
self.right = self.right.expression;
|
|
self.left = make_node(Cola.AST_Undefined, self.left).optimize(compressor);
|
|
if (self.operator.length == 2) self.operator += "=";
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
if (compressor.option("booleans") && compressor.in_boolean_context()) switch (self.operator) {
|
|
case "&&":
|
|
var ll = self.left.evaluate(compressor);
|
|
var rr = self.right.evaluate(compressor);
|
|
if ((ll.length > 1 && !ll[1]) || (rr.length > 1 && !rr[1])) {
|
|
compressor.warn("Boolean && always false [{file}:{line},{col}]", self.start);
|
|
return make_node(Cola.AST_False, self);
|
|
}
|
|
if (ll.length > 1 && ll[1]) {
|
|
return rr[0];
|
|
}
|
|
if (rr.length > 1 && rr[1]) {
|
|
return ll[0];
|
|
}
|
|
break;
|
|
case "||":
|
|
var ll = self.left.evaluate(compressor);
|
|
var rr = self.right.evaluate(compressor);
|
|
if ((ll.length > 1 && ll[1]) || (rr.length > 1 && rr[1])) {
|
|
compressor.warn("Boolean || always true [{file}:{line},{col}]", self.start);
|
|
return make_node(Cola.AST_True, self);
|
|
}
|
|
if (ll.length > 1 && !ll[1]) {
|
|
return rr[0];
|
|
}
|
|
if (rr.length > 1 && !rr[1]) {
|
|
return ll[0];
|
|
}
|
|
break;
|
|
case "+":
|
|
var ll = self.left.evaluate(compressor);
|
|
var rr = self.right.evaluate(compressor);
|
|
if ((ll.length > 1 && ll[0] instanceof Cola.AST_String && ll[1]) ||
|
|
(rr.length > 1 && rr[0] instanceof Cola.AST_String && rr[1])) {
|
|
compressor.warn("+ in boolean context always true [{file}:{line},{col}]", self.start);
|
|
return make_node(Cola.AST_True, self);
|
|
}
|
|
break;
|
|
}
|
|
if (compressor.option("comparisons")) {
|
|
if (!(compressor.parent() instanceof Cola.AST_Binary)
|
|
|| compressor.parent() instanceof Cola.AST_Assign) {
|
|
var negated = make_node(Cola.AST_UnaryPrefix, self, {
|
|
operator: "!",
|
|
expression: self.negate(compressor)
|
|
});
|
|
self = best_of(self, negated);
|
|
}
|
|
switch (self.operator) {
|
|
case "<": reverse(">"); break;
|
|
case "<=": reverse(">="); break;
|
|
}
|
|
}
|
|
if (self.operator == "+" && self.right instanceof Cola.AST_String
|
|
&& self.right.getValue() === "" && self.left instanceof Cola.AST_Binary
|
|
&& self.left.operator == "+" && self.left.is_string(compressor)) {
|
|
return self.left;
|
|
}
|
|
if (compressor.option("evaluate")) {
|
|
if (self.operator == "+") {
|
|
if (self.left instanceof Cola.AST_Constant
|
|
&& self.right instanceof Cola.AST_Binary
|
|
&& self.right.operator == "+"
|
|
&& self.right.left instanceof Cola.AST_Constant
|
|
&& self.right.is_string(compressor)) {
|
|
self = make_node(Cola.AST_Binary, self, {
|
|
operator: "+",
|
|
left: make_node(Cola.AST_String, null, {
|
|
value: "" + self.left.getValue() + self.right.left.getValue(),
|
|
start: self.left.start,
|
|
end: self.right.left.end
|
|
}),
|
|
right: self.right.right
|
|
});
|
|
}
|
|
if (self.right instanceof Cola.AST_Constant
|
|
&& self.left instanceof Cola.AST_Binary
|
|
&& self.left.operator == "+"
|
|
&& self.left.right instanceof Cola.AST_Constant
|
|
&& self.left.is_string(compressor)) {
|
|
self = make_node(Cola.AST_Binary, self, {
|
|
operator: "+",
|
|
left: self.left.left,
|
|
right: make_node(Cola.AST_String, null, {
|
|
value: "" + self.left.right.getValue() + self.right.getValue(),
|
|
start: self.left.right.start,
|
|
end: self.right.end
|
|
})
|
|
});
|
|
}
|
|
if (self.left instanceof Cola.AST_Binary
|
|
&& self.left.operator == "+"
|
|
&& self.left.is_string(compressor)
|
|
&& self.left.right instanceof Cola.AST_Constant
|
|
&& self.right instanceof Cola.AST_Binary
|
|
&& self.right.operator == "+"
|
|
&& self.right.left instanceof Cola.AST_Constant
|
|
&& self.right.is_string(compressor)) {
|
|
self = make_node(Cola.AST_Binary, self, {
|
|
operator: "+",
|
|
left: make_node(Cola.AST_Binary, self.left, {
|
|
operator: "+",
|
|
left: self.left.left,
|
|
right: make_node(Cola.AST_String, null, {
|
|
value: "" + self.left.right.getValue() + self.right.left.getValue(),
|
|
start: self.left.right.start,
|
|
end: self.right.left.end
|
|
})
|
|
}),
|
|
right: self.right.right
|
|
});
|
|
}
|
|
}
|
|
}
|
|
// x * (y * z) ==> x * y * z
|
|
if (self.right instanceof Cola.AST_Binary
|
|
&& self.right.operator == self.operator
|
|
&& (self.operator == "*" || self.operator == "&&" || self.operator == "||"))
|
|
{
|
|
self.left = make_node(Cola.AST_Binary, self.left, {
|
|
operator : self.operator,
|
|
left : self.left,
|
|
right : self.right.left
|
|
});
|
|
self.right = self.right.right;
|
|
return self.transform(compressor);
|
|
}
|
|
return self.evaluate(compressor)[0];
|
|
});
|
|
|
|
OPT(Cola.AST_SymbolRef, function(self, compressor){
|
|
if (self.undeclared()) {
|
|
var defines = compressor.option("global_defs");
|
|
if (defines && defines.hasOwnProperty(self.name)) {
|
|
return make_node_from_constant(compressor, defines[self.name], self);
|
|
}
|
|
switch (self.name) {
|
|
case "undefined":
|
|
return make_node(Cola.AST_Undefined, self);
|
|
case "NaN":
|
|
return make_node(Cola.AST_NaN, self);
|
|
case "Infinity":
|
|
return make_node(Cola.AST_Infinity, self);
|
|
}
|
|
}
|
|
return self;
|
|
});
|
|
|
|
OPT(Cola.AST_Undefined, function(self, compressor){
|
|
if (compressor.option("unsafe")) {
|
|
var scope = compressor.find_parent(Cola.AST_Scope);
|
|
var undef = scope.find_variable("undefined");
|
|
if (undef) {
|
|
var ref = make_node(Cola.AST_SymbolRef, self, {
|
|
name : "undefined",
|
|
scope : scope,
|
|
thedef : undef
|
|
});
|
|
ref.reference();
|
|
return ref;
|
|
}
|
|
}
|
|
return self;
|
|
});
|
|
|
|
var ASSIGN_OPS = [ '+', '-', '/', '*', '%', '>>', '<<', '>>>', '|', '^', '&' ];
|
|
OPT(Cola.AST_Assign, function(self, compressor){
|
|
self = self.lift_sequences(compressor);
|
|
if (self.operator == "="
|
|
&& self.left instanceof Cola.AST_SymbolRef
|
|
&& self.right instanceof Cola.AST_Binary
|
|
&& self.right.left instanceof Cola.AST_SymbolRef
|
|
&& self.right.left.name == self.left.name
|
|
&& Cola.member(self.right.operator, ASSIGN_OPS)) {
|
|
self.operator = self.right.operator + "=";
|
|
self.right = self.right.right;
|
|
}
|
|
return self;
|
|
});
|
|
|
|
OPT(Cola.AST_Conditional, function(self, compressor){
|
|
if (!compressor.option("conditionals")) return self;
|
|
if (self.condition instanceof Cola.AST_Seq) {
|
|
var car = self.condition.car;
|
|
self.condition = self.condition.cdr;
|
|
return Cola.AST_Seq.cons(car, self);
|
|
}
|
|
var cond = self.condition.evaluate(compressor);
|
|
if (cond.length > 1) {
|
|
if (cond[1]) {
|
|
compressor.warn("Condition always true [{file}:{line},{col}]", self.start);
|
|
return self.consequent;
|
|
} else {
|
|
compressor.warn("Condition always false [{file}:{line},{col}]", self.start);
|
|
return self.alternative;
|
|
}
|
|
}
|
|
var negated = cond[0].negate(compressor);
|
|
if (best_of(cond[0], negated) === negated) {
|
|
self = make_node(Cola.AST_Conditional, self, {
|
|
condition: negated,
|
|
consequent: self.alternative,
|
|
alternative: self.consequent
|
|
});
|
|
}
|
|
var consequent = self.consequent;
|
|
var alternative = self.alternative;
|
|
if (consequent instanceof Cola.AST_Assign
|
|
&& alternative instanceof Cola.AST_Assign
|
|
&& consequent.operator == alternative.operator
|
|
&& consequent.left.equivalent_to(alternative.left)
|
|
) {
|
|
/*
|
|
* Stuff like this:
|
|
* if (foo) exp = something; else exp = something_else;
|
|
* ==>
|
|
* exp = foo ? something : something_else;
|
|
*/
|
|
return make_node(Cola.AST_Assign, self, {
|
|
operator: consequent.operator,
|
|
left: consequent.left,
|
|
right: make_node(Cola.AST_Conditional, self, {
|
|
condition: self.condition,
|
|
consequent: consequent.right,
|
|
alternative: alternative.right
|
|
})
|
|
});
|
|
}
|
|
if (consequent instanceof Cola.AST_Call
|
|
&& alternative.TYPE === consequent.TYPE
|
|
&& consequent.args.length == alternative.args.length
|
|
&& consequent.expression.equivalent_to(alternative.expression)) {
|
|
if (consequent.args.length == 0) {
|
|
return make_node(Cola.AST_Seq, self, {
|
|
car: self.condition,
|
|
cdr: consequent
|
|
});
|
|
}
|
|
if (consequent.args.length == 1) {
|
|
consequent.args[0] = make_node(Cola.AST_Conditional, self, {
|
|
condition: self.condition,
|
|
consequent: consequent.args[0],
|
|
alternative: alternative.args[0]
|
|
});
|
|
return consequent;
|
|
}
|
|
}
|
|
// x?y?z:a:a --> x&&y?z:a
|
|
if (consequent instanceof Cola.AST_Conditional
|
|
&& consequent.alternative.equivalent_to(alternative)) {
|
|
return make_node(Cola.AST_Conditional, self, {
|
|
condition: make_node(Cola.AST_Binary, self, {
|
|
left: self.condition,
|
|
operator: "&&",
|
|
right: consequent.condition
|
|
}),
|
|
consequent: consequent.consequent,
|
|
alternative: alternative
|
|
});
|
|
}
|
|
return self;
|
|
});
|
|
|
|
OPT(Cola.AST_Boolean, function(self, compressor){
|
|
if (compressor.option("booleans")) {
|
|
var p = compressor.parent();
|
|
if (p instanceof Cola.AST_Binary && (p.operator == "=="
|
|
|| p.operator == "!=")) {
|
|
compressor.warn("Non-strict equality against boolean: {operator} {value} [{file}:{line},{col}]", {
|
|
operator : p.operator,
|
|
value : self.value,
|
|
file : p.start.file,
|
|
line : p.start.line,
|
|
col : p.start.col,
|
|
});
|
|
return make_node(Cola.AST_Number, self, {
|
|
value: +self.value
|
|
});
|
|
}
|
|
return make_node(Cola.AST_UnaryPrefix, self, {
|
|
operator: "!",
|
|
expression: make_node(Cola.AST_Number, self, {
|
|
value: 1 - self.value
|
|
})
|
|
});
|
|
}
|
|
return self;
|
|
});
|
|
|
|
OPT(Cola.AST_Sub, function(self, compressor){
|
|
var prop = self.property;
|
|
if (prop instanceof Cola.AST_String && compressor.option("properties")) {
|
|
prop = prop.getValue();
|
|
if (Cola.RESERVED_WORDS(prop) ? compressor.option("screw_ie8") : Cola.is_identifier_string(prop)) {
|
|
return make_node(Cola.AST_Dot, self, {
|
|
expression : self.expression,
|
|
property : prop
|
|
});
|
|
}
|
|
var v = parseFloat(prop);
|
|
if (!isNaN(v) && v.toString() == prop) {
|
|
self.property = make_node(Cola.AST_Number, self.property, {
|
|
value: v
|
|
});
|
|
}
|
|
}
|
|
return self;
|
|
});
|
|
|
|
function literals_in_boolean_context(self, compressor) {
|
|
if (compressor.option("booleans") && compressor.in_boolean_context()) {
|
|
return make_node(Cola.AST_True, self);
|
|
}
|
|
return self;
|
|
};
|
|
OPT(Cola.AST_Array, literals_in_boolean_context);
|
|
OPT(Cola.AST_Object, literals_in_boolean_context);
|
|
OPT(Cola.AST_RegExp, literals_in_boolean_context);
|
|
|
|
})();
|