--- /dev/null
+/***********************************************************************
+
+ A JavaScript tokenizer / parser / beautifier / compressor.
+
+ This version is suitable for Node.js. With minimal changes (the
+ exports stuff) it should work on any JS platform.
+
+ This file implements some AST processors. They work on data built
+ by parse-js.
+
+ Exported functions:
+
+ - ast_mangle(ast, include_toplevel) -- mangles the
+ variable/function names in the AST. Returns an AST. Pass true
+ as second argument to mangle toplevel names too.
+
+ - ast_squeeze(ast) -- employs various optimizations to make the
+ final generated code even smaller. Returns an AST.
+
+ - gen_code(ast, beautify) -- generates JS code from the AST. Pass
+ true (or an object, see the code for some options) as second
+ argument to get "pretty" (indented) code.
+
+ -------------------------------- (C) ---------------------------------
+
+ Author: Mihai Bazon
+ <mihai.bazon@gmail.com>
+ http://mihai.bazon.net/blog
+
+ Distributed under the BSD license:
+
+ Copyright 2010 (c) Mihai Bazon <mihai.bazon@gmail.com>
+
+ Redistribution and use in source and binary forms, with or without
+ modification, are permitted provided that the following conditions
+ are met:
+
+ * Redistributions of source code must retain the above
+ copyright notice, this list of conditions and the following
+ disclaimer.
+
+ * Redistributions in binary form must reproduce the above
+ copyright notice, this list of conditions and the following
+ disclaimer in the documentation and/or other materials
+ provided with the distribution.
+
+ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER “AS IS” AND ANY
+ EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE
+ LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
+ OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
+ TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
+ THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ SUCH DAMAGE.
+
+ ***********************************************************************/
+
+var jsp = require("./parse-js"),
+ slice = jsp.slice,
+ member = jsp.member,
+ PRECEDENCE = jsp.PRECEDENCE,
+ OPERATORS = jsp.OPERATORS;
+
+/* -----[ helper for AST traversal ]----- */
+
+function ast_walker(ast) {
+ function _vardefs(defs) {
+ return MAP(defs, function(def){
+ var a = [ def[0] ];
+ if (def.length > 1)
+ a[1] = walk(def[1]);
+ return a;
+ });
+ };
+ var walkers = {
+ "string": function(str) {
+ return [ "string", str ];
+ },
+ "num": function(num) {
+ return [ "num", num ];
+ },
+ "name": function(name) {
+ return [ "name", name ];
+ },
+ "toplevel": function(statements) {
+ return [ "toplevel", MAP(statements, walk) ];
+ },
+ "block": function(statements) {
+ var out = [ "block" ];
+ if (statements != null)
+ out.push(MAP(statements, walk));
+ return out;
+ },
+ "var": function(defs) {
+ return [ "var", _vardefs(defs) ];
+ },
+ "const": function(defs) {
+ return [ "const", _vardefs(defs) ];
+ },
+ "try": function(t, c, f) {
+ return [
+ "try",
+ MAP(t, walk),
+ c != null ? [ c[0], MAP(c[1], walk) ] : null,
+ f != null ? MAP(f, walk) : null
+ ];
+ },
+ "throw": function(expr) {
+ return [ "throw", walk(expr) ];
+ },
+ "new": function(ctor, args) {
+ return [ "new", walk(ctor), MAP(args, walk) ];
+ },
+ "switch": function(expr, body) {
+ return [ "switch", walk(expr), MAP(body, function(branch){
+ return [ branch[0] ? walk(branch[0]) : null,
+ MAP(branch[1], walk) ];
+ }) ];
+ },
+ "break": function(label) {
+ return [ "break", label ];
+ },
+ "continue": function(label) {
+ return [ "continue", label ];
+ },
+ "conditional": function(cond, t, e) {
+ return [ "conditional", walk(cond), walk(t), walk(e) ];
+ },
+ "assign": function(op, lvalue, rvalue) {
+ return [ "assign", op, walk(lvalue), walk(rvalue) ];
+ },
+ "dot": function(expr) {
+ return [ "dot", walk(expr) ].concat(slice(arguments, 1));
+ },
+ "call": function(expr, args) {
+ return [ "call", walk(expr), MAP(args, walk) ];
+ },
+ "function": function(name, args, body) {
+ return [ "function", name, args.slice(), MAP(body, walk) ];
+ },
+ "defun": function(name, args, body) {
+ return [ "defun", name, args.slice(), MAP(body, walk) ];
+ },
+ "if": function(conditional, t, e) {
+ return [ "if", walk(conditional), walk(t), walk(e) ];
+ },
+ "for": function(init, cond, step, block) {
+ return [ "for", walk(init), walk(cond), walk(step), walk(block) ];
+ },
+ "for-in": function(has_var, key, hash, block) {
+ return [ "for-in", has_var, key, walk(hash), walk(block) ];
+ },
+ "while": function(cond, block) {
+ return [ "while", walk(cond), walk(block) ];
+ },
+ "do": function(cond, block) {
+ return [ "do", walk(cond), walk(block) ];
+ },
+ "return": function(expr) {
+ return [ "return", walk(expr) ];
+ },
+ "binary": function(op, left, right) {
+ return [ "binary", op, walk(left), walk(right) ];
+ },
+ "unary-prefix": function(op, expr) {
+ return [ "unary-prefix", op, walk(expr) ];
+ },
+ "unary-postfix": function(op, expr) {
+ return [ "unary-postfix", op, walk(expr) ];
+ },
+ "sub": function(expr, subscript) {
+ return [ "sub", walk(expr), walk(subscript) ];
+ },
+ "object": function(props) {
+ return [ "object", MAP(props, function(p){
+ return p.length == 2
+ ? [ p[0], walk(p[1]) ]
+ : [ p[0], walk(p[1]), p[2] ]; // get/set-ter
+ }) ];
+ },
+ "regexp": function(rx, mods) {
+ return [ "regexp", rx, mods ];
+ },
+ "array": function(elements) {
+ return [ "array", MAP(elements, walk) ];
+ },
+ "stat": function(stat) {
+ return [ "stat", walk(stat) ];
+ },
+ "seq": function() {
+ return [ "seq" ].concat(MAP(slice(arguments), walk));
+ },
+ "label": function(name, block) {
+ return [ "label", name, walk(block) ];
+ },
+ "with": function(expr, block) {
+ return [ "with", walk(expr), walk(block) ];
+ },
+ "atom": function(name) {
+ return [ "atom", name ];
+ }
+ };
+
+ var user = {};
+ var stack = [];
+ function walk(ast) {
+ if (ast == null)
+ return null;
+ try {
+ stack.push(ast);
+ var type = ast[0];
+ var gen = user[type];
+ if (gen) {
+ var ret = gen.apply(ast, ast.slice(1));
+ if (ret != null)
+ return ret;
+ }
+ gen = walkers[type];
+ return gen.apply(ast, ast.slice(1));
+ } finally {
+ stack.pop();
+ }
+ };
+
+ function with_walkers(walkers, cont){
+ var save = {}, i;
+ for (i in walkers) if (HOP(walkers, i)) {
+ save[i] = user[i];
+ user[i] = walkers[i];
+ }
+ var ret = cont();
+ for (i in save) if (HOP(save, i)) {
+ if (!save[i]) delete user[i];
+ else user[i] = save[i];
+ }
+ return ret;
+ };
+
+ return {
+ walk: walk,
+ with_walkers: with_walkers,
+ parent: function() {
+ return stack[stack.length - 2]; // last one is current node
+ },
+ stack: function() {
+ return stack;
+ }
+ };
+};
+
+/* -----[ Scope and mangling ]----- */
+
+function Scope(parent) {
+ this.names = {}; // names defined in this scope
+ this.mangled = {}; // mangled names (orig.name => mangled)
+ this.rev_mangled = {}; // reverse lookup (mangled => orig.name)
+ this.cname = -1; // current mangled name
+ this.refs = {}; // names referenced from this scope
+ this.uses_with = false; // will become TRUE if eval() is detected in this or any subscopes
+ this.uses_eval = false; // will become TRUE if with() is detected in this or any subscopes
+ this.parent = parent; // parent scope
+ this.children = []; // sub-scopes
+ if (parent) {
+ this.level = parent.level + 1;
+ parent.children.push(this);
+ } else {
+ this.level = 0;
+ }
+};
+
+var base54 = (function(){
+ var DIGITS = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ$_";
+ return function(num) {
+ var ret = "";
+ do {
+ ret = DIGITS.charAt(num % 54) + ret;
+ num = Math.floor(num / 54);
+ } while (num > 0);
+ return ret;
+ };
+})();
+
+Scope.prototype = {
+ has: function(name) {
+ for (var s = this; s; s = s.parent)
+ if (HOP(s.names, name))
+ return s;
+ },
+ has_mangled: function(mname) {
+ for (var s = this; s; s = s.parent)
+ if (HOP(s.rev_mangled, mname))
+ return s;
+ },
+ toJSON: function() {
+ return {
+ names: this.names,
+ uses_eval: this.uses_eval,
+ uses_with: this.uses_with
+ };
+ },
+
+ next_mangled: function() {
+ // we must be careful that the new mangled name:
+ //
+ // 1. doesn't shadow a mangled name from a parent
+ // scope, unless we don't reference the original
+ // name from this scope OR from any sub-scopes!
+ // This will get slow.
+ //
+ // 2. doesn't shadow an original name from a parent
+ // scope, in the event that the name is not mangled
+ // in the parent scope and we reference that name
+ // here OR IN ANY SUBSCOPES!
+ //
+ // 3. doesn't shadow a name that is referenced but not
+ // defined (possibly global defined elsewhere).
+ for (;;) {
+ var m = base54(++this.cname), prior;
+
+ // case 1.
+ prior = this.has_mangled(m);
+ if (prior && this.refs[prior.rev_mangled[m]] === prior)
+ continue;
+
+ // case 2.
+ prior = this.has(m);
+ if (prior && prior !== this && this.refs[m] === prior && !prior.has_mangled(m))
+ continue;
+
+ // case 3.
+ if (HOP(this.refs, m) && this.refs[m] == null)
+ continue;
+
+ // I got "do" once. :-/
+ if (!is_identifier(m))
+ continue;
+
+ return m;
+ }
+ },
+ get_mangled: function(name, newMangle) {
+ if (this.uses_eval || this.uses_with) return name; // no mangle if eval or with is in use
+ var s = this.has(name);
+ if (!s) return name; // not in visible scope, no mangle
+ if (HOP(s.mangled, name)) return s.mangled[name]; // already mangled in this scope
+ if (!newMangle) return name; // not found and no mangling requested
+
+ var m = s.next_mangled();
+ s.rev_mangled[m] = name;
+ return s.mangled[name] = m;
+ },
+ define: function(name) {
+ if (name != null)
+ return this.names[name] = name;
+ }
+};
+
+function ast_add_scope(ast) {
+
+ var current_scope = null;
+ var w = ast_walker(), walk = w.walk;
+ var having_eval = [];
+
+ function with_new_scope(cont) {
+ current_scope = new Scope(current_scope);
+ var ret = current_scope.body = cont();
+ ret.scope = current_scope;
+ current_scope = current_scope.parent;
+ return ret;
+ };
+
+ function define(name) {
+ return current_scope.define(name);
+ };
+
+ function reference(name) {
+ current_scope.refs[name] = true;
+ };
+
+ function _lambda(name, args, body) {
+ return [ this[0], define(name), args, with_new_scope(function(){
+ MAP(args, define);
+ return MAP(body, walk);
+ })];
+ };
+
+ return with_new_scope(function(){
+ // process AST
+ var ret = w.with_walkers({
+ "function": _lambda,
+ "defun": _lambda,
+ "with": function(expr, block) {
+ for (var s = current_scope; s; s = s.parent)
+ s.uses_with = true;
+ },
+ "var": function(defs) {
+ MAP(defs, function(d){ define(d[0]) });
+ },
+ "const": function(defs) {
+ MAP(defs, function(d){ define(d[0]) });
+ },
+ "try": function(t, c, f) {
+ if (c != null) return [
+ "try",
+ MAP(t, walk),
+ [ define(c[0]), MAP(c[1], walk) ],
+ f != null ? MAP(f, walk) : null
+ ];
+ },
+ "name": function(name) {
+ if (name == "eval")
+ having_eval.push(current_scope);
+ reference(name);
+ },
+ "for-in": function(has_var, name) {
+ if (has_var) define(name);
+ else reference(name);
+ }
+ }, function(){
+ return walk(ast);
+ });
+
+ // the reason why we need an additional pass here is
+ // that names can be used prior to their definition.
+
+ // scopes where eval was detected and their parents
+ // are marked with uses_eval, unless they define the
+ // "eval" name.
+ MAP(having_eval, function(scope){
+ if (!scope.has("eval")) while (scope) {
+ scope.uses_eval = true;
+ scope = scope.parent;
+ }
+ });
+
+ // for referenced names it might be useful to know
+ // their origin scope. current_scope here is the
+ // toplevel one.
+ function fixrefs(scope, i) {
+ // do children first; order shouldn't matter
+ for (i = scope.children.length; --i >= 0;)
+ fixrefs(scope.children[i]);
+ for (i in scope.refs) if (HOP(scope.refs, i)) {
+ // find origin scope and propagate the reference to origin
+ for (var origin = scope.has(i), s = scope; s; s = s.parent) {
+ s.refs[i] = origin;
+ if (s === origin) break;
+ }
+ }
+ };
+ fixrefs(current_scope);
+
+ return ret;
+ });
+
+};
+
+/* -----[ mangle names ]----- */
+
+function ast_mangle(ast, do_toplevel) {
+ var w = ast_walker(), walk = w.walk, scope;
+
+ function get_mangled(name, newMangle) {
+ if (!do_toplevel && !scope.parent) return name; // don't mangle toplevel
+ return scope.get_mangled(name, newMangle);
+ };
+
+ function _lambda(name, args, body) {
+ if (name) name = get_mangled(name);
+ body = with_scope(body.scope, function(){
+ args = MAP(args, function(name){ return get_mangled(name) });
+ return MAP(body, walk);
+ });
+ return [ this[0], name, args, body ];
+ };
+
+ function with_scope(s, cont) {
+ var _scope = scope;
+ scope = s;
+ for (var i in s.names) if (HOP(s.names, i)) {
+ get_mangled(i, true);
+ }
+ var ret = cont();
+ ret.scope = s;
+ scope = _scope;
+ return ret;
+ };
+
+ function _vardefs(defs) {
+ return MAP(defs, function(d){
+ return [ get_mangled(d[0]), walk(d[1]) ];
+ });
+ };
+
+ return w.with_walkers({
+ "function": _lambda,
+ "defun": function() {
+ // move function declarations to the top when
+ // they are not in some block.
+ var ast = _lambda.apply(this, arguments);
+ switch (w.parent()[0]) {
+ case "toplevel":
+ case "function":
+ case "defun":
+ return MAP.at_top(ast);
+ }
+ return ast;
+ },
+ "var": function(defs) {
+ return [ "var", _vardefs(defs) ];
+ },
+ "const": function(defs) {
+ return [ "const", _vardefs(defs) ];
+ },
+ "name": function(name) {
+ return [ "name", get_mangled(name) ];
+ },
+ "try": function(t, c, f) {
+ return [ "try",
+ MAP(t, walk),
+ c != null ? [ get_mangled(c[0]), MAP(c[1], walk) ] : null,
+ f != null ? MAP(f, walk) : null ];
+ },
+ "toplevel": function(body) {
+ return with_scope(this.scope, function(){
+ return [ "toplevel", MAP(body, walk) ];
+ });
+ },
+ "for-in": function(has_var, name, obj, stat) {
+ return [ "for-in", has_var, get_mangled(name), walk(obj), walk(stat) ];
+ }
+ }, function() {
+ return walk(ast_add_scope(ast));
+ });
+};
+
+/* -----[
+ - compress foo["bar"] into foo.bar,
+ - remove block brackets {} where possible
+ - join consecutive var declarations
+ - various optimizations for IFs:
+ - if (cond) foo(); else bar(); ==> cond?foo():bar();
+ - if (cond) foo(); ==> cond&&foo();
+ - if (foo) return bar(); else return baz(); ==> return foo?bar():baz(); // also for throw
+ - if (foo) return bar(); else something(); ==> {if(foo)return bar();something()}
+ ]----- */
+
+var warn = function(){};
+
+function best_of(ast1, ast2) {
+ return gen_code(ast1).length > gen_code(ast2[0] == "stat" ? ast2[1] : ast2).length ? ast2 : ast1;
+};
+
+function last_stat(b) {
+ if (b[0] == "block" && b[1] && b[1].length > 0)
+ return b[1][b[1].length - 1];
+ return b;
+}
+
+function aborts(t) {
+ if (t) {
+ t = last_stat(t);
+ if (t[0] == "return" || t[0] == "break" || t[0] == "continue" || t[0] == "throw")
+ return true;
+ }
+};
+
+function negate(c) {
+ var not_c = [ "unary-prefix", "!", c ];
+ switch (c[0]) {
+ case "unary-prefix":
+ return c[1] == "!" ? c[2] : not_c;
+ case "binary":
+ var op = c[1], left = c[2], right = c[3];
+ switch (op) {
+ case "<=": return [ "binary", ">", left, right ];
+ case "<": return [ "binary", ">=", left, right ];
+ case ">=": return [ "binary", "<", left, right ];
+ case ">": return [ "binary", "<=", left, right ];
+ case "==": return [ "binary", "!=", left, right ];
+ case "!=": return [ "binary", "==", left, right ];
+ case "===": return [ "binary", "!==", left, right ];
+ case "!==": return [ "binary", "===", left, right ];
+ case "&&": return best_of(not_c, [ "binary", "||", negate(left), negate(right) ]);
+ case "||": return best_of(not_c, [ "binary", "&&", negate(left), negate(right) ]);
+ }
+ break;
+ }
+ return not_c;
+};
+
+function make_conditional(c, t, e) {
+ if (c[0] == "unary-prefix" && c[1] == "!") {
+ return e ? [ "conditional", c[2], e, t ] : [ "binary", "||", c[2], t ];
+ } else {
+ return e ? [ "conditional", c, t, e ] : [ "binary", "&&", c, t ];
+ }
+};
+
+function empty(b) {
+ return !b || (b[0] == "block" && (!b[1] || b[1].length == 0));
+};
+
+function ast_squeeze(ast, options) {
+ options = defaults(options, {
+ make_seqs : true,
+ dead_code : true,
+ no_warnings : false,
+ extra : false
+ });
+
+ var w = ast_walker(), walk = w.walk, scope;
+
+ function with_scope(s, cont) {
+ var _scope = scope;
+ scope = s;
+ var ret = cont();
+ ret.scope = s;
+ scope = _scope;
+ return ret;
+ };
+
+ function is_constant(node) {
+ return node[0] == "string" || node[0] == "num";
+ };
+
+ function find_first_execute(node) {
+ if (!node)
+ return false;
+
+ switch (node[0]) {
+ case "num":
+ case "string":
+ case "name":
+ return node;
+ case "call":
+ case "conditional":
+ case "for":
+ case "if":
+ case "new":
+ case "return":
+ case "stat":
+ case "switch":
+ case "throw":
+ return find_first_execute(node[1]);
+ case "binary":
+ return find_first_execute(node[2]);
+ case "assign":
+ if (node[1] === true)
+ return find_first_execute(node[3]);
+ break;
+ case "var":
+ if (node[1][0].length > 1)
+ return find_first_execute(node[1][0][1]);
+ break;
+ }
+ return null;
+ }
+
+ function find_assign_recursive(p, v) {
+ if (p[0] == "assign" && p[1] != true || p[0] == "unary-prefix") {
+ if (p[2][0] == "name" && v[0] == "name" && p[2][1] == v[1])
+ return true;
+ return false;
+ }
+
+ if (p[0] != "assign" || p[1] !== true)
+ return false;
+
+ if ((is_constant(p[3]) && p[3][0] == v[0] && p[3][1] == v[1]) ||
+ (p[3][0] == "name" && v[0] == "name" && p[3][1] == v[1]) ||
+ (p[2][0] == "name" && v[0] == "name" && p[2][1] == v[1]))
+ return true;
+
+ return find_assign_recursive(p[3], v);
+ };
+
+ function rmblock(block) {
+ if (block != null && block[0] == "block" && block[1] && block[1].length == 1)
+ block = block[1][0];
+ return block;
+ };
+
+ function clone(obj) {
+ if (obj && obj.constructor == Array)
+ return MAP(obj, clone);
+ return obj;
+ };
+
+ function make_seq_to_statements(node) {
+ if (node[0] != "seq") {
+ switch (node[0]) {
+ case "var":
+ case "const":
+ return [ node ];
+ default:
+ return [ [ "stat", node ] ];
+ }
+ }
+
+ var ret = [];
+ for (var i = 1; i < node.length; i++)
+ ret.push.apply(ret, make_seq_to_statements(node[i]));
+
+ return ret;
+ };
+
+ function _lambda(name, args, body) {
+ return [ this[0], name, args, with_scope(body.scope, function(){
+ return tighten(MAP(body, walk), "lambda");
+ }) ];
+ };
+
+ // we get here for blocks that have been already transformed.
+ // this function does a few things:
+ // 1. discard useless blocks
+ // 2. join consecutive var declarations
+ // 3. remove obviously dead code
+ // 4. transform consecutive statements using the comma operator
+ // 5. if block_type == "lambda" and it detects constructs like if(foo) return ... - rewrite like if (!foo) { ... }
+ function tighten(statements, block_type) {
+ statements = statements.reduce(function(a, stat){
+ if (stat[0] == "block") {
+ if (stat[1]) {
+ a.push.apply(a, stat[1]);
+ }
+ } else {
+ a.push(stat);
+ }
+ return a;
+ }, []);
+
+ if (options.extra) {
+ // Detightening things. We do this because then we can assume that the
+ // statements are structured in a specific way.
+ statements = (function(a, prev) {
+ statements.forEach(function(cur) {
+ switch (cur[0]) {
+ case "for":
+ if (cur[1] != null) {
+ a.push.apply(a, make_seq_to_statements(cur[1]));
+ cur[1] = null;
+ }
+ a.push(cur);
+ break;
+ case "stat":
+ var stats = make_seq_to_statements(cur[1]);
+ stats.forEach(function(s) {
+ if (s[1][0] == "unary-postfix")
+ s[1][0] = "unary-prefix";
+ });
+ a.push.apply(a, stats);
+ break;
+ default:
+ a.push(cur);
+ }
+ });
+ return a;
+ })([]);
+
+ statements = (function(a, prev) {
+ statements.forEach(function(cur) {
+ if (!(prev && prev[0] == "stat")) {
+ a.push(cur);
+ prev = cur;
+ return;
+ }
+
+ var p = prev[1];
+ var c = find_first_execute(cur);
+ if (c && find_assign_recursive(p, c)) {
+ var old_cur = clone(cur);
+ c.splice(0, c.length);
+ c.push.apply(c, p);
+ var tmp_cur = best_of(cur, [ "toplevel", [ prev, old_cur ] ]);
+ if (tmp_cur == cur) {
+ a[a.length -1] = cur;
+ } else {
+ cur = old_cur;
+ a.push(cur);
+ }
+ } else {
+ a.push(cur);
+ }
+ prev = cur;
+ });
+ return a;
+ })([]);
+ }
+
+ statements = (function(a, prev){
+ statements.forEach(function(cur){
+ if (prev && ((cur[0] == "var" && prev[0] == "var") ||
+ (cur[0] == "const" && prev[0] == "const"))) {
+ prev[1] = prev[1].concat(cur[1]);
+ } else {
+ a.push(cur);
+ prev = cur;
+ }
+ });
+ return a;
+ })([]);
+
+ if (options.dead_code) statements = (function(a, has_quit){
+ statements.forEach(function(st){
+ if (has_quit) {
+ if (member(st[0], [ "function", "defun" , "var", "const" ])) {
+ a.push(st);
+ }
+ else if (!options.no_warnings)
+ warn("Removing unreachable code: " + gen_code(st, true));
+ }
+ else {
+ a.push(st);
+ if (member(st[0], [ "return", "throw", "break", "continue" ]))
+ has_quit = true;
+ }
+ });
+ return a;
+ })([]);
+
+ if (options.make_seqs) statements = (function(a, prev) {
+ statements.forEach(function(cur){
+ if (prev && prev[0] == "stat" && cur[0] == "stat") {
+ prev[1] = [ "seq", prev[1], cur[1] ];
+ } else {
+ a.push(cur);
+ prev = cur;
+ }
+ });
+ return a;
+ })([]);
+
+ if (options.extra) {
+ statements = (function(a, prev){
+ statements.forEach(function(cur){
+ var replaced = false;
+ if (prev && cur[0] == "for" && cur[1] == null && (prev[0] == "var" || prev[0] == "const" || prev[0] == "stat")) {
+ cur[1] = prev;
+ a[a.length - 1] = cur;
+ } else {
+ a.push(cur);
+ }
+ prev = cur;
+ });
+ return a;
+ })([]);
+ }
+
+ if (block_type == "lambda") statements = (function(i, a, stat){
+ while (i < statements.length) {
+ stat = statements[i++];
+ if (stat[0] == "if" && !stat[3]) {
+ if (stat[2][0] == "return" && stat[2][1] == null) {
+ a.push(make_if(negate(stat[1]), [ "block", statements.slice(i) ]));
+ break;
+ }
+ var last = last_stat(stat[2]);
+ if (last[0] == "return" && last[1] == null) {
+ a.push(make_if(stat[1], [ "block", stat[2][1].slice(0, -1) ], [ "block", statements.slice(i) ]));
+ break;
+ }
+ }
+ a.push(stat);
+ }
+ return a;
+ })(0, []);
+
+ return statements;
+ };
+
+ function make_if(c, t, e) {
+ c = walk(c);
+ t = walk(t);
+ e = walk(e);
+
+ if (empty(t)) {
+ c = negate(c);
+ t = e;
+ e = null;
+ } else if (empty(e)) {
+ e = null;
+ } else {
+ // if we have both else and then, maybe it makes sense to switch them?
+ (function(){
+ var a = gen_code(c);
+ var n = negate(c);
+ var b = gen_code(n);
+ if (b.length < a.length) {
+ var tmp = t;
+ t = e;
+ e = tmp;
+ c = n;
+ }
+ })();
+ }
+ if (empty(e) && empty(t))
+ return [ "stat", c ];
+ var ret = [ "if", c, t, e ];
+ if (t[0] == "stat") {
+ if (e) {
+ if (e[0] == "stat") {
+ ret = best_of(ret, [ "stat", make_conditional(c, t[1], e[1]) ]);
+ }
+ }
+ else {
+ ret = best_of(ret, [ "stat", make_conditional(c, t[1]) ]);
+ }
+ }
+ else if (e && t[0] == e[0] && (t[0] == "return" || t[0] == "throw")) {
+ ret = best_of(ret, [ t[0], make_conditional(c, t[1], e[1] ) ]);
+ }
+ else if (e && aborts(t)) {
+ ret = [ [ "if", c, t ] ];
+ if (e[0] == "block") {
+ if (e[1]) ret = ret.concat(e[1]);
+ }
+ else {
+ ret.push(e);
+ }
+ ret = walk([ "block", ret ]);
+ }
+ else if (t && aborts(e)) {
+ ret = [ [ "if", negate(c), e ] ];
+ if (t[0] == "block") {
+ if (t[1]) ret = ret.concat(t[1]);
+ } else {
+ ret.push(t);
+ }
+ ret = walk([ "block", ret ]);
+ }
+ return ret;
+ };
+
+ return w.with_walkers({
+ "sub": function(expr, subscript) {
+ if (subscript[0] == "string") {
+ var name = subscript[1];
+ if (is_identifier(name)) {
+ return [ "dot", walk(expr), name ];
+ }
+ }
+ },
+ "if": make_if,
+ "toplevel": function(body) {
+ return [ "toplevel", with_scope(this.scope, function(){
+ return tighten(MAP(body, walk));
+ }) ];
+ },
+ "switch": function(expr, body) {
+ var last = body.length - 1;
+ return [ "switch", walk(expr), MAP(body, function(branch, i){
+ var block = tighten(MAP(branch[1], walk));
+ if (i == last && block.length > 0) {
+ var node = block[block.length - 1];
+ if (node[0] == "break" && !node[1])
+ block.pop();
+ }
+ return [ branch[0] ? walk(branch[0]) : null, block ];
+ }) ];
+ },
+ "function": _lambda,
+ "defun": _lambda,
+ "block": function(body) {
+ if (body) return rmblock([ "block", tighten(MAP(body, walk)) ]);
+ },
+ "binary": function(op, left, right) {
+ left = walk(left);
+ right = walk(right);
+ var best = [ "binary", op, left, right ];
+ if (is_constant(right)) {
+ if (is_constant(left)) {
+ var val = null;
+ switch (op) {
+ case "+": val = left[1] + right[1]; break;
+ case "*": val = left[1] * right[1]; break;
+ case "/": val = left[1] / right[1]; break;
+ case "-": val = left[1] - right[1]; break;
+ case "<<": val = left[1] << right[1]; break;
+ case ">>": val = left[1] >> right[1]; break;
+ case ">>>": val = left[1] >>> right[1]; break;
+ }
+ if (val != null) {
+ best = best_of(best, [ typeof val == "string" ? "string" : "num", val ]);
+ }
+ } else if (left[0] == "binary" && left[1] == "+" && left[3][0] == "string") {
+ best = best_of(best, [ "binary", "+", left[2], [ "string", left[3][1] + right[1] ] ]);
+ }
+ }
+ return best;
+ },
+ "conditional": function(c, t, e) {
+ return make_conditional(walk(c), walk(t), walk(e));
+ },
+ "try": function(t, c, f) {
+ return [
+ "try",
+ tighten(MAP(t, walk)),
+ c != null ? [ c[0], tighten(MAP(c[1], walk)) ] : null,
+ f != null ? tighten(MAP(f, walk)) : null
+ ];
+ },
+ "unary-prefix": function(op, cond) {
+ if (op == "!") {
+ cond = walk(cond);
+ if (cond[0] == "unary-prefix" && cond[1] == "!") {
+ var p = w.parent();
+ if (p[0] == "unary-prefix" && p[1] == "!")
+ return cond[2];
+ return [ "unary-prefix", "!", cond ];
+ }
+ return best_of(this, negate(cond));
+ }
+ },
+ "name": function(name) {
+ switch (name) {
+ case "true": return [ "unary-prefix", "!", [ "num", 0 ]];
+ case "false": return [ "unary-prefix", "!", [ "num", 1 ]];
+ }
+ },
+ "new": function(ctor, args) {
+ if (ctor[0] == "name" && ctor[1] == "Array" && !scope.has("Array")) {
+ if (args.length != 1) {
+ return [ "array", args ];
+ } else {
+ return [ "call", [ "name", "Array" ], args ];
+ }
+ }
+ },
+ "call": function(expr, args) {
+ if (expr[0] == "name" && expr[1] == "Array" && args.length != 1 && !scope.has("Array")) {
+ return [ "array", args ];
+ }
+ }
+ }, function() {
+ return walk(ast_add_scope(ast));
+ });
+};
+
+/* -----[ re-generate code from the AST ]----- */
+
+var DOT_CALL_NO_PARENS = jsp.array_to_hash([
+ "name",
+ "array",
+ "string",
+ "dot",
+ "sub",
+ "call",
+ "regexp"
+]);
+
+function make_string(str) {
+ var dq = 0, sq = 0;
+ str = str.replace(/[\\\b\f\n\r\t\x22\x27]/g, function(s){
+ switch (s) {
+ case "\\": return "\\\\";
+ case "\b": return "\\b";
+ case "\f": return "\\f";
+ case "\n": return "\\n";
+ case "\r": return "\\r";
+ case "\t": return "\\t";
+ case '"': ++dq; return '"';
+ case "'": ++sq; return "'";
+ }
+ return s;
+ });
+ if (dq > sq) {
+ return "'" + str.replace(/\x27/g, "\\'") + "'";
+ } else {
+ return '"' + str.replace(/\x22/g, '\\"') + '"';
+ }
+};
+
+function gen_code(ast, beautify) {
+ if (beautify) beautify = defaults(beautify, {
+ indent_start : 0,
+ indent_level : 4,
+ quote_keys : false,
+ space_colon : false
+ });
+ var indentation = 0,
+ newline = beautify ? "\n" : "",
+ space = beautify ? " " : "";
+
+ function indent(line) {
+ if (line == null)
+ line = "";
+ if (beautify)
+ line = repeat_string(" ", beautify.indent_start + indentation * beautify.indent_level) + line;
+ return line;
+ };
+
+ function with_indent(cont, incr) {
+ if (incr == null) incr = 1;
+ indentation += incr;
+ try { return cont.apply(null, slice(arguments, 1)); }
+ finally { indentation -= incr; }
+ };
+
+ function add_spaces(a) {
+ if (beautify)
+ return a.join(" ");
+ var b = [];
+ for (var i = 0; i < a.length; ++i) {
+ var next = a[i + 1];
+ b.push(a[i]);
+ if (next &&
+ ((/[a-z0-9_\x24]$/i.test(a[i].toString()) && /^[a-z0-9_\x24]/i.test(next.toString())) ||
+ (/[\+\-]$/.test(a[i].toString()) && /^[\+\-]/.test(next.toString())))) {
+ b.push(" ");
+ }
+ }
+ return b.join("");
+ };
+
+ function add_commas(a) {
+ return a.join("," + space);
+ };
+
+ function parenthesize(expr) {
+ var gen = make(expr);
+ for (var i = 1; i < arguments.length; ++i) {
+ var el = arguments[i];
+ if ((el instanceof Function && el(expr)) || expr[0] == el)
+ return "(" + gen + ")";
+ }
+ return gen;
+ };
+
+ function best_of(a) {
+ if (a.length == 1) {
+ return a[0];
+ }
+ if (a.length == 2) {
+ var b = a[1];
+ a = a[0];
+ return a.length <= b.length ? a : b;
+ }
+ return best_of([ a[0], best_of(a.slice(1)) ]);
+ };
+
+ function needs_parens(expr) {
+ if (expr[0] == "function") {
+ // dot/call on a literal function requires the
+ // function literal itself to be parenthesized
+ // only if it's the first "thing" in a
+ // statement. This means that the parent is
+ // "stat", but it could also be a "seq" and
+ // we're the first in this "seq" and the
+ // parent is "stat", and so on. Messy stuff,
+ // but it worths the trouble.
+ var a = slice($stack), self = a.pop(), p = a.pop();
+ while (p) {
+ if (p[0] == "stat") return true;
+ if ((p[0] == "seq" && p[1] === self) ||
+ (p[0] == "call" && p[1] === self) ||
+ (p[0] == "binary" && p[2] === self)) {
+ self = p;
+ p = a.pop();
+ } else {
+ return false;
+ }
+ }
+ }
+ return !HOP(DOT_CALL_NO_PARENS, expr[0]);
+ };
+
+ function make_num(num) {
+ var str = num.toString(10), a = [ str.replace(/^0\./, ".") ], m;
+ if (Math.floor(num) === num) {
+ a.push("0x" + num.toString(16).toLowerCase(), // probably pointless
+ "0" + num.toString(8)); // same.
+ if ((m = /^(.*?)(0+)$/.exec(num))) {
+ a.push(m[1] + "e" + m[2].length);
+ }
+ } else if ((m = /^0?\.(0+)(.*)$/.exec(num))) {
+ a.push(m[2] + "e-" + (m[1].length + m[2].length),
+ str.substr(str.indexOf(".")));
+ }
+ return best_of(a);
+ };
+
+ var generators = {
+ "string": make_string,
+ "num": make_num,
+ "name": make_name,
+ "toplevel": function(statements) {
+ return make_block_statements(statements)
+ .join(newline + newline);
+ },
+ "block": make_block,
+ "var": function(defs) {
+ return "var " + add_commas(MAP(defs, make_1vardef)) + ";";
+ },
+ "const": function(defs) {
+ return "const " + add_commas(MAP(defs, make_1vardef)) + ";";
+ },
+ "try": function(tr, ca, fi) {
+ var out = [ "try", make_block(tr) ];
+ if (ca) out.push("catch", "(" + ca[0] + ")", make_block(ca[1]));
+ if (fi) out.push("finally", make_block(fi));
+ return add_spaces(out);
+ },
+ "throw": function(expr) {
+ return add_spaces([ "throw", make(expr) ]) + ";";
+ },
+ "new": function(ctor, args) {
+ args = args.length > 0 ? "(" + add_commas(MAP(args, make)) + ")" : "";
+ return add_spaces([ "new", parenthesize(ctor, "seq", "binary", "conditional", "assign", function(expr){
+ var w = ast_walker(), has_call = {};
+ try {
+ w.with_walkers({
+ "call": function() { throw has_call },
+ "function": function() { return this }
+ }, function(){
+ w.walk(expr);
+ });
+ } catch(ex) {
+ if (ex === has_call)
+ return true;
+ throw ex;
+ }
+ }) + args ]);
+ },
+ "switch": function(expr, body) {
+ return add_spaces([ "switch", "(" + make(expr) + ")", make_switch_block(body) ]);
+ },
+ "break": function(label) {
+ var out = "break";
+ if (label != null)
+ out += " " + make_name(label);
+ return out + ";";
+ },
+ "continue": function(label) {
+ var out = "continue";
+ if (label != null)
+ out += " " + make_name(label);
+ return out + ";";
+ },
+ "conditional": function(co, th, el) {
+ return add_spaces([ parenthesize(co, "assign", "seq", "conditional"), "?",
+ parenthesize(th, "seq"), ":",
+ parenthesize(el, "seq") ]);
+ },
+ "assign": function(op, lvalue, rvalue) {
+ if (op && op !== true) op += "=";
+ else op = "=";
+ return add_spaces([ make(lvalue), op, parenthesize(rvalue, "seq") ]);
+ },
+ "dot": function(expr) {
+ var out = make(expr), i = 1;
+ if (expr[0] == "num")
+ out += ".";
+ else if (needs_parens(expr))
+ out = "(" + out + ")";
+ while (i < arguments.length)
+ out += "." + make_name(arguments[i++]);
+ return out;
+ },
+ "call": function(func, args) {
+ var f = make(func);
+ if (needs_parens(func))
+ f = "(" + f + ")";
+ return f + "(" + add_commas(MAP(args, function(expr){
+ return parenthesize(expr, "seq");
+ })) + ")";
+ },
+ "function": make_function,
+ "defun": make_function,
+ "if": function(co, th, el) {
+ var out = [ "if", "(" + make(co) + ")", el ? make_then(th) : make(th) ];
+ if (el) {
+ out.push("else", make(el));
+ }
+ return add_spaces(out);
+ },
+ "for": function(init, cond, step, block) {
+ var out = [ "for" ];
+ init = (init != null ? make(init) : "").replace(/;*\s*$/, ";" + space);
+ cond = (cond != null ? make(cond) : "").replace(/;*\s*$/, ";" + space);
+ step = (step != null ? make(step) : "").replace(/;*\s*$/, "");
+ var args = init + cond + step;
+ if (args == "; ; ") args = ";;";
+ out.push("(" + args + ")", make(block));
+ return add_spaces(out);
+ },
+ "for-in": function(has_var, key, hash, block) {
+ var out = add_spaces([ "for", "(" ]);
+ if (has_var)
+ out += "var ";
+ out += add_spaces([ make_name(key) + " in " + make(hash) + ")", make(block) ]);
+ return out;
+ },
+ "while": function(condition, block) {
+ return add_spaces([ "while", "(" + make(condition) + ")", make(block) ]);
+ },
+ "do": function(condition, block) {
+ return add_spaces([ "do", make(block), "while", "(" + make(condition) + ")" ]) + ";";
+ },
+ "return": function(expr) {
+ var out = [ "return" ];
+ if (expr != null) out.push(make(expr));
+ return add_spaces(out) + ";";
+ },
+ "binary": function(operator, lvalue, rvalue) {
+ var left = make(lvalue), right = make(rvalue);
+ // XXX: I'm pretty sure other cases will bite here.
+ // we need to be smarter.
+ // adding parens all the time is the safest bet.
+ if (member(lvalue[0], [ "assign", "conditional", "seq" ]) ||
+ lvalue[0] == "binary" && PRECEDENCE[operator] > PRECEDENCE[lvalue[1]]) {
+ left = "(" + left + ")";
+ }
+ if (member(rvalue[0], [ "assign", "conditional", "seq" ]) ||
+ rvalue[0] == "binary" && PRECEDENCE[operator] >= PRECEDENCE[rvalue[1]]) {
+ right = "(" + right + ")";
+ }
+ return add_spaces([ left, operator, right ]);
+ },
+ "unary-prefix": function(operator, expr) {
+ var val = make(expr);
+ if (!(expr[0] == "num" || (expr[0] == "unary-prefix" && !HOP(OPERATORS, operator + expr[1])) || !needs_parens(expr)))
+ val = "(" + val + ")";
+ return operator + (jsp.is_alphanumeric_char(operator.charAt(0)) ? " " : "") + val;
+ },
+ "unary-postfix": function(operator, expr) {
+ var val = make(expr);
+ if (!(expr[0] == "num" || (expr[0] == "unary-postfix" && !HOP(OPERATORS, operator + expr[1])) || !needs_parens(expr)))
+ val = "(" + val + ")";
+ return val + operator;
+ },
+ "sub": function(expr, subscript) {
+ var hash = make(expr);
+ if (needs_parens(expr))
+ hash = "(" + hash + ")";
+ return hash + "[" + make(subscript) + "]";
+ },
+ "object": function(props) {
+ if (props.length == 0)
+ return "{}";
+ return "{" + newline + with_indent(function(){
+ return MAP(props, function(p){
+ if (p.length == 3) {
+ // getter/setter. The name is in p[0], the arg.list in p[1][2], the
+ // body in p[1][3] and type ("get" / "set") in p[2].
+ return indent(make_function(p[0], p[1][2], p[1][3], p[2]));
+ }
+ var key = p[0], val = make(p[1]);
+ if (beautify && beautify.quote_keys) {
+ key = make_string(key);
+ } else if (typeof key == "number" || !beautify && +key + "" == key) {
+ key = make_num(+key);
+ } else if (!is_identifier(key)) {
+ key = make_string(key);
+ }
+ return indent(add_spaces(beautify && beautify.space_colon
+ ? [ key, ":", val ]
+ : [ key + ":", val ]));
+ }).join("," + newline);
+ }) + newline + indent("}");
+ },
+ "regexp": function(rx, mods) {
+ return "/" + rx + "/" + mods;
+ },
+ "array": function(elements) {
+ if (elements.length == 0) return "[]";
+ return add_spaces([ "[", add_commas(MAP(elements, function(el){
+ return parenthesize(el, "seq");
+ })), "]" ]);
+ },
+ "stat": function(stmt) {
+ return make(stmt).replace(/;*\s*$/, ";");
+ },
+ "seq": function() {
+ return add_commas(MAP(slice(arguments), make));
+ },
+ "label": function(name, block) {
+ return add_spaces([ make_name(name), ":", make(block) ]);
+ },
+ "with": function(expr, block) {
+ return add_spaces([ "with", "(" + make(expr) + ")", make(block) ]);
+ },
+ "atom": function(name) {
+ return make_name(name);
+ },
+ "comment1": function(text) {
+ return "//" + text + "\n";
+ },
+ "comment2": function(text) {
+ return "/*" + text + "*/";
+ }
+ };
+
+ // The squeezer replaces "block"-s that contain only a single
+ // statement with the statement itself; technically, the AST
+ // is correct, but this can create problems when we output an
+ // IF having an ELSE clause where the THEN clause ends in an
+ // IF *without* an ELSE block (then the outer ELSE would refer
+ // to the inner IF). This function checks for this case and
+ // adds the block brackets if needed.
+ function make_then(th) {
+ if (th[0] == "do") {
+ // https://github.com/mishoo/UglifyJS/issues/#issue/57
+ // IE croaks with "syntax error" on code like this:
+ // if (foo) do ... while(cond); else ...
+ // we need block brackets around do/while
+ return make([ "block", [ th ]]);
+ }
+ var b = th;
+ while (true) {
+ var type = b[0];
+ if (type == "if") {
+ if (!b[3])
+ // no else, we must add the block
+ return make([ "block", [ th ]]);
+ b = b[3];
+ }
+ else if (type == "while" || type == "do") b = b[2];
+ else if (type == "for" || type == "for-in") b = b[4];
+ else break;
+ }
+ return make(th);
+ };
+
+ function make_function(name, args, body, keyword) {
+ var out = keyword || "function";
+ if (name) {
+ out += " " + make_name(name);
+ }
+ out += "(" + add_commas(MAP(args, make_name)) + ")";
+ return add_spaces([ out, make_block(body) ]);
+ };
+
+ function make_name(name) {
+ return name.toString();
+ };
+
+ function make_block_statements(statements) {
+ for (var a = [], last = statements.length - 1, i = 0; i <= last; ++i) {
+ var stat = statements[i];
+ var code = make(stat);
+ if (code != ";") {
+ if (!beautify && i == last)
+ code = code.replace(/;+\s*$/, "");
+ a.push(code);
+ }
+ }
+ return MAP(a, indent);
+ };
+
+ function make_switch_block(body) {
+ var n = body.length;
+ if (n == 0) return "{}";
+ return "{" + newline + MAP(body, function(branch, i){
+ var has_body = branch[1].length > 0, code = with_indent(function(){
+ return indent(branch[0]
+ ? add_spaces([ "case", make(branch[0]) + ":" ])
+ : "default:");
+ }, 0.5) + (has_body ? newline + with_indent(function(){
+ return make_block_statements(branch[1]).join(newline);
+ }) : "");
+ if (!beautify && has_body && i < n - 1)
+ code += ";";
+ return code;
+ }).join(newline) + newline + indent("}");
+ };
+
+ function make_block(statements) {
+ if (!statements) return ";";
+ if (statements.length == 0) return "{}";
+ return "{" + newline + with_indent(function(){
+ return make_block_statements(statements).join(newline);
+ }) + newline + indent("}");
+ };
+
+ function make_1vardef(def) {
+ var name = def[0], val = def[1];
+ if (val != null)
+ name = add_spaces([ name, "=", make(val) ]);
+ return name;
+ };
+
+ var $stack = [];
+
+ function make(node) {
+ var type = node[0];
+ var gen = generators[type];
+ if (!gen)
+ throw new Error("Can't find generator for \"" + type + "\"");
+ $stack.push(node);
+ var ret = gen.apply(type, node.slice(1));
+ $stack.pop();
+ return ret;
+ };
+
+ return make(ast);
+};
+
+/* -----[ Utilities ]----- */
+
+function repeat_string(str, i) {
+ if (i <= 0) return "";
+ if (i == 1) return str;
+ var d = repeat_string(str, i >> 1);
+ d += d;
+ if (i & 1) d += str;
+ return d;
+};
+
+function defaults(args, defs) {
+ var ret = {};
+ if (args === true)
+ args = {};
+ for (var i in defs) if (HOP(defs, i)) {
+ ret[i] = (args && HOP(args, i)) ? args[i] : defs[i];
+ }
+ return ret;
+};
+
+function is_identifier(name) {
+ return /^[a-z_$][a-z0-9_$]*$/i.test(name)
+ && name != "this"
+ && !HOP(jsp.KEYWORDS_ATOM, name)
+ && !HOP(jsp.RESERVED_WORDS, name)
+ && !HOP(jsp.KEYWORDS, name);
+};
+
+function HOP(obj, prop) {
+ return Object.prototype.hasOwnProperty.call(obj, prop);
+};
+
+// some utilities
+
+var MAP;
+
+(function(){
+ MAP = function(a, f, o) {
+ var ret = [];
+ for (var i = 0; i < a.length; ++i) {
+ var val = f.call(o, a[i], i);
+ if (val instanceof AtTop) ret.unshift(val.v);
+ else ret.push(val);
+ }
+ return ret;
+ };
+ MAP.at_top = function(val) { return new AtTop(val) };
+ function AtTop(val) { this.v = val };
+})();
+
+/* -----[ Exports ]----- */
+
+exports.ast_walker = ast_walker;
+exports.ast_mangle = ast_mangle;
+exports.ast_squeeze = ast_squeeze;
+exports.gen_code = gen_code;
+exports.ast_add_scope = ast_add_scope;
+exports.ast_squeeze_more = require("./squeeze-more").ast_squeeze_more;
+exports.set_logger = function(logger) { warn = logger };
git.asbjorn.biz / jquery.git / blobdiff