text: /***********************************************************************
  
    A JavaScript tokenizer / parser / beautifier / compressor.
    https://github.com/mishoo/UglifyJS2
  
    -------------------------------- (C) ---------------------------------
  
                             Author: Mihai Bazon
                           <mihai.bazon@gmail.com>
                         http://mihai.bazon.net/blog
  
    Distributed under the BSD license:
  
      Copyright 2012 (c) Mihai Bazon <mihai.bazon@gmail.com>
  
      Redistribution and use in source and binary forms, with or without
      modification, are permitted provided that the following conditions
      are met:
  
          * Redistributions of source code must retain the above
            copyright notice, this list of conditions and the following
            disclaimer.
  
          * Redistributions in binary form must reproduce the above
            copyright notice, this list of conditions and the following
            disclaimer in the documentation and/or other materials
            provided with the distribution.
  
      THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER “AS IS” AND ANY
      EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
      IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
      PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE
      LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
      OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
      PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
      PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
      THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
      TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
      THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
      SUCH DAMAGE.
  
   ***********************************************************************/
  
  "use strict";
  
  var EXPECT_DIRECTIVE = /^$|[;{][\s\n]*$/;
  
  function OutputStream(options) {
  
      options = defaults(options, {
          indent_start     : 0,
          indent_level     : 4,
          quote_keys       : false,
          space_colon      : true,
          ascii_only       : false,
          unescape_regexps : false,
          inline_script    : false,
          width            : 80,
          max_line_len     : 32000,
          beautify         : false,
          source_map       : null,
          bracketize       : false,
          semicolons       : true,
          comments         : false,
          shebang          : true,
          preserve_line    : false,
          screw_ie8        : true,
          preamble         : null,
          quote_style      : 0,
          keep_quoted_props: false,
          wrap_iife        : false,
      }, true);
  
      // Convert comment option to RegExp if neccessary and set up comments filter
      if (typeof options.comments === "string" && /^\/.*\/[a-zA-Z]*$/.test(options.comments)) {
          var regex_pos = options.comments.lastIndexOf("/");
          options.comments = new RegExp(
              options.comments.substr(1, regex_pos - 1),
              options.comments.substr(regex_pos + 1)
          );
      }
      if (options.comments instanceof RegExp) {
          options.comments = (function(f) {
              return function(comment) {
                  return comment.type == "comment5" || f.test(comment.value);
              }
          })(options.comments);
      }
      else if (typeof options.comments === "function") {
          options.comments = (function(f) {
              return function(comment) {
                  return comment.type == "comment5" || f(this, comment);
              }
          })(options.comments);
      }
      else if (options.comments === "some") {
          options.comments = function(comment) {
              var text = comment.value;
              var type = comment.type;
              if (type == "comment2") {
                  // multiline comment
                  return /@preserve|@license|@cc_on/i.test(text);
              }
              return type == "comment5";
          }
      }
      else if (options.comments){ // NOTE includes "all" option
          options.comments = function() {
              return true;
          }
      } else {
          // Falsy case, so reject all comments, except shebangs
          options.comments = function(comment) {
              return comment.type == "comment5";
          }
      }
  
      var indentation = 0;
      var current_col = 0;
      var current_line = 1;
      var current_pos = 0;
      var OUTPUT = "";
  
      function to_ascii(str, identifier) {
          return str.replace(/[\u0000-\u001f\u007f-\uffff]/g, function(ch) {
              var code = ch.charCodeAt(0).toString(16);
              if (code.length <= 2 && !identifier) {
                  while (code.length < 2) code = "0" + code;
                  return "\\x" + code;
              } else {
                  while (code.length < 4) code = "0" + code;
                  return "\\u" + code;
              }
          });
      };
  
      function make_string(str, quote) {
          var dq = 0, sq = 0;
          str = str.replace(/[\\\b\f\n\r\v\t\x22\x27\u2028\u2029\0\ufeff]/g,
            function(s, i){
              switch (s) {
                case '"': ++dq; return '"';
                case "'": ++sq; return "'";
                case "\\": return "\\\\";
                case "\n": return "\\n";
                case "\r": return "\\r";
                case "\t": return "\\t";
                case "\b": return "\\b";
                case "\f": return "\\f";
                case "\x0B": return options.screw_ie8 ? "\\v" : "\\x0B";
                case "\u2028": return "\\u2028";
                case "\u2029": return "\\u2029";
                case "\ufeff": return "\\ufeff";
                case "\0":
                    return /[0-7]/.test(str.charAt(i+1)) ? "\\x00" : "\\0";
              }
              return s;
          });
          function quote_single() {
              return "'" + str.replace(/\x27/g, "\\'") + "'";
          }
          function quote_double() {
              return '"' + str.replace(/\x22/g, '\\"') + '"';
          }
          if (options.ascii_only) str = to_ascii(str);
          switch (options.quote_style) {
            case 1:
              return quote_single();
            case 2:
              return quote_double();
            case 3:
              return quote == "'" ? quote_single() : quote_double();
            default:
              return dq > sq ? quote_single() : quote_double();
          }
      };
  
      function encode_string(str, quote) {
          var ret = make_string(str, quote);
          if (options.inline_script) {
              ret = ret.replace(/<\x2fscript([>\/\t\n\f\r ])/gi, "<\\/script$1");
              ret = ret.replace(/\x3c!--/g, "\\x3c!--");
              ret = ret.replace(/--\x3e/g, "--\\x3e");
          }
          return ret;
      };
  
      function make_name(name) {
          name = name.toString();
          if (options.ascii_only)
              name = to_ascii(name, true);
          return name;
      };
  
      function make_indent(back) {
          return repeat_string(" ", options.indent_start + indentation - back * options.indent_level);
      };
  
      /* -----[ beautification/minification ]----- */
  
      var might_need_space = false;
      var might_need_semicolon = false;
      var last = null;
  
      function last_char() {
          return last.charAt(last.length - 1);
      };
  
      function maybe_newline() {
          if (options.max_line_len && current_col > options.max_line_len)
              print("\n");
      };
  
      var requireSemicolonChars = makePredicate("( [ + * / - , .");
  
      function print(str) {
          str = String(str);
          var ch = str.charAt(0);
          if (might_need_semicolon) {
              might_need_semicolon = false;
  
              if ((!ch || ";}".indexOf(ch) < 0) && !/[;]$/.test(last)) {
                  if (options.semicolons || requireSemicolonChars(ch)) {
                      OUTPUT += ";";
                      current_col++;
                      current_pos++;
                  } else {
                      OUTPUT += "\n";
                      current_pos++;
                      current_line++;
                      current_col = 0;
  
                      if (/^\s+$/.test(str)) {
                          // reset the semicolon flag, since we didn't print one
                          // now and might still have to later
                          might_need_semicolon = true;
                      }
                  }
  
                  if (!options.beautify)
                      might_need_space = false;
              }
          }
  
          if (!options.beautify && options.preserve_line && stack[stack.length - 1]) {
              var target_line = stack[stack.length - 1].start.line;
              while (current_line < target_line) {
                  OUTPUT += "\n";
                  current_pos++;
                  current_line++;
                  current_col = 0;
                  might_need_space = false;
              }
          }
  
          if (might_need_space) {
              var prev = last_char();
              if ((is_identifier_char(prev)
                   && (is_identifier_char(ch) || ch == "\\"))
                  || (/^[\+\-\/]$/.test(ch) && ch == prev))
              {
                  OUTPUT += " ";
                  current_col++;
                  current_pos++;
              }
              might_need_space = false;
          }
          var a = str.split(/\r?\n/), n = a.length - 1;
          current_line += n;
          if (n == 0) {
              current_col += a[n].length;
          } else {
              current_col = a[n].length;
          }
          current_pos += str.length;
          last = str;
          OUTPUT += str;
      };
  
      var space = options.beautify ? function() {
          print(" ");
      } : function() {
          might_need_space = true;
      };
  
      var indent = options.beautify ? function(half) {
          if (options.beautify) {
              print(make_indent(half ? 0.5 : 0));
          }
      } : noop;
  
      var with_indent = options.beautify ? function(col, cont) {
          if (col === true) col = next_indent();
          var save_indentation = indentation;
          indentation = col;
          var ret = cont();
          indentation = save_indentation;
          return ret;
      } : function(col, cont) { return cont() };
  
      var newline = options.beautify ? function() {
          print("\n");
      } : maybe_newline;
  
      var semicolon = options.beautify ? function() {
          print(";");
      } : function() {
          might_need_semicolon = true;
      };
  
      function force_semicolon() {
          might_need_semicolon = false;
          print(";");
      };
  
      function next_indent() {
          return indentation + options.indent_level;
      };
  
      function with_block(cont) {
          var ret;
          print("{");
          newline();
          with_indent(next_indent(), function(){
              ret = cont();
          });
          indent();
          print("}");
          return ret;
      };
  
      function with_parens(cont) {
          print("(");
          //XXX: still nice to have that for argument lists
          //var ret = with_indent(current_col, cont);
          var ret = cont();
          print(")");
          return ret;
      };
  
      function with_square(cont) {
          print("[");
          //var ret = with_indent(current_col, cont);
          var ret = cont();
          print("]");
          return ret;
      };
  
      function comma() {
          print(",");
          space();
      };
  
      function colon() {
          print(":");
          if (options.space_colon) space();
      };
  
      var add_mapping = options.source_map ? function(token, name) {
          try {
              if (token) options.source_map.add(
                  token.file || "?",
                  current_line, current_col,
                  token.line, token.col,
                  (!name && token.type == "name") ? token.value : name
              );
          } catch(ex) {
              AST_Node.warn("Couldn't figure out mapping for {file}:{line},{col} → {cline},{ccol} [{name}]", {
                  file: token.file,
                  line: token.line,
                  col: token.col,
                  cline: current_line,
                  ccol: current_col,
                  name: name || ""
              })
          }
      } : noop;
  
      function get() {
          return OUTPUT;
      };
  
      if (options.preamble) {
          print(options.preamble.replace(/\r\n?|[\n\u2028\u2029]|\s*$/g, "\n"));
      }
  
      var stack = [];
      return {
          get             : get,
          toString        : get,
          indent          : indent,
          indentation     : function() { return indentation },
          current_width   : function() { return current_col - indentation },
          should_break    : function() { return options.width && this.current_width() >= options.width },
          newline         : newline,
          print           : print,
          space           : space,
          comma           : comma,
          colon           : colon,
          last            : function() { return last },
          semicolon       : semicolon,
          force_semicolon : force_semicolon,
          to_ascii        : to_ascii,
          print_name      : function(name) { print(make_name(name)) },
          print_string    : function(str, quote, escape_directive) {
              var encoded = encode_string(str, quote);
              if (escape_directive === true && encoded.indexOf("\\") === -1) {
                  // Insert semicolons to break directive prologue
                  if (!EXPECT_DIRECTIVE.test(OUTPUT)) {
                      force_semicolon();
                  }
                  force_semicolon();
              }
              print(encoded);
          },
          encode_string   : encode_string,
          next_indent     : next_indent,
          with_indent     : with_indent,
          with_block      : with_block,
          with_parens     : with_parens,
          with_square     : with_square,
          add_mapping     : add_mapping,
          option          : function(opt) { return options[opt] },
          line            : function() { return current_line },
          col             : function() { return current_col },
          pos             : function() { return current_pos },
          push_node       : function(node) { stack.push(node) },
          pop_node        : function() { return stack.pop() },
          stack           : function() { return stack },
          parent          : function(n) {
              return stack[stack.length - 2 - (n || 0)];
          }
      };
  
  };
  
  /* -----[ code generators ]----- */
  
  (function(){
  
      /* -----[ utils ]----- */
  
      function DEFPRINT(nodetype, generator) {
          nodetype.DEFMETHOD("_codegen", generator);
      };
  
      var use_asm = false;
      var in_directive = false;
  
      AST_Node.DEFMETHOD("print", function(stream, force_parens){
          var self = this, generator = self._codegen, prev_use_asm = use_asm;
          if (self instanceof AST_Directive && self.value == "use asm" && stream.parent() instanceof AST_Scope) {
              use_asm = true;
          }
          function doit() {
              self.add_comments(stream);
              self.add_source_map(stream);
              generator(self, stream);
          }
          stream.push_node(self);
          if (force_parens || self.needs_parens(stream)) {
              stream.with_parens(doit);
          } else {
              doit();
          }
          stream.pop_node();
          if (self instanceof AST_Scope) {
              use_asm = prev_use_asm;
          }
      });
  
      AST_Node.DEFMETHOD("print_to_string", function(options){
          var s = OutputStream(options);
          if (!options) s._readonly = true;
          this.print(s);
          return s.get();
      });
  
      /* -----[ comments ]----- */
  
      AST_Node.DEFMETHOD("add_comments", function(output){
          if (output._readonly) return;
          var self = this;
          var start = self.start;
          if (start && !start._comments_dumped) {
              start._comments_dumped = true;
              var comments = start.comments_before || [];
  
              // XXX: ugly fix for https://github.com/mishoo/UglifyJS2/issues/112
              //               and https://github.com/mishoo/UglifyJS2/issues/372
              if (self instanceof AST_Exit && self.value) {
                  self.value.walk(new TreeWalker(function(node){
                      if (node.start && node.start.comments_before) {
                          comments = comments.concat(node.start.comments_before);
                          node.start.comments_before = [];
                      }
                      if (node instanceof AST_Function ||
                          node instanceof AST_Array ||
                          node instanceof AST_Object)
                      {
                          return true; // don't go inside.
                      }
                  }));
              }
  
              comments = comments.filter(output.option("comments"), self);
  
              // Keep single line comments after nlb, after nlb
              if (!output.option("beautify") && comments.length > 0 &&
                  /comment[134]/.test(comments[0].type) &&
                  output.col() !== 0 && comments[0].nlb)
              {
                  output.print("\n");
              }
  
              comments.forEach(function(c){
                  if (/comment[134]/.test(c.type)) {
                      output.print("//" + c.value + "\n");
                      output.indent();
                  }
                  else if (c.type == "comment2") {
                      output.print("/*" + c.value + "*/");
                      if (start.nlb) {
                          output.print("\n");
                          output.indent();
                      } else {
                          output.space();
                      }
                  }
                  else if (output.pos() === 0 && c.type == "comment5" && output.option("shebang")) {
                      output.print("#!" + c.value + "\n");
                      output.indent();
                  }
              });
          }
      });
  
      /* -----[ PARENTHESES ]----- */
  
      function PARENS(nodetype, func) {
          if (Array.isArray(nodetype)) {
              nodetype.forEach(function(nodetype){
                  PARENS(nodetype, func);
              });
          } else {
              nodetype.DEFMETHOD("needs_parens", func);
          }
      };
  
      PARENS(AST_Node, function(){
          return false;
      });
  
      // a function expression needs parens around it when it's provably
      // the first token to appear in a statement.
      PARENS(AST_Function, function(output){
          if (first_in_statement(output)) {
              return true;
          }
  
          if (output.option('wrap_iife')) {
              var p = output.parent();
              return p instanceof AST_Call && p.expression === this;
          }
  
          return false;
      });
  
      // same goes for an object literal, because otherwise it would be
      // interpreted as a block of code.
      PARENS(AST_Object, function(output){
          return first_in_statement(output);
      });
  
      PARENS([ AST_Unary, AST_Undefined ], function(output){
          var p = output.parent();
          return p instanceof AST_PropAccess && p.expression === this
              || p instanceof AST_Call && p.expression === this;
      });
  
      PARENS(AST_Seq, function(output){
          var p = output.parent();
          return p instanceof AST_Call             // (foo, bar)() or foo(1, (2, 3), 4)
              || p instanceof AST_Unary            // !(foo, bar, baz)
              || p instanceof AST_Binary           // 1 + (2, 3) + 4 ==> 8
              || p instanceof AST_VarDef           // var a = (1, 2), b = a + a; ==> b == 4
              || p instanceof AST_PropAccess       // (1, {foo:2}).foo or (1, {foo:2})["foo"] ==> 2
              || p instanceof AST_Array            // [ 1, (2, 3), 4 ] ==> [ 1, 3, 4 ]
              || p instanceof AST_ObjectProperty   // { foo: (1, 2) }.foo ==> 2
              || p instanceof AST_Conditional      /* (false, true) ? (a = 10, b = 20) : (c = 30)
                                                    * ==> 20 (side effect, set a := 10 and b := 20) */
          ;
      });
  
      PARENS(AST_Binary, function(output){
          var p = output.parent();
          // (foo && bar)()
          if (p instanceof AST_Call && p.expression === this)
              return true;
          // typeof (foo && bar)
          if (p instanceof AST_Unary)
              return true;
          // (foo && bar)["prop"], (foo && bar).prop
          if (p instanceof AST_PropAccess && p.expression === this)
              return true;
          // this deals with precedence: 3 * (2 + 1)
          if (p instanceof AST_Binary) {
              var po = p.operator, pp = PRECEDENCE[po];
              var so = this.operator, sp = PRECEDENCE[so];
              if (pp > sp
                  || (pp == sp
                      && this === p.right)) {
                  return true;
              }
          }
      });
  
      PARENS(AST_PropAccess, function(output){
          var p = output.parent();
          if (p instanceof AST_New && p.expression === this) {
              // i.e. new (foo.bar().baz)
              //
              // if there's one call into this subtree, then we need
              // parens around it too, otherwise the call will be
              // interpreted as passing the arguments to the upper New
              // expression.
              try {
                  this.walk(new TreeWalker(function(node){
                      if (node instanceof AST_Call) throw p;
                  }));
              } catch(ex) {
                  if (ex !== p) throw ex;
                  return true;
              }
          }
      });
  
      PARENS(AST_Call, function(output){
          var p = output.parent(), p1;
          if (p instanceof AST_New && p.expression === this)
              return true;
  
          // workaround for Safari bug.
          // https://bugs.webkit.org/show_bug.cgi?id=123506
          return this.expression instanceof AST_Function
              && p instanceof AST_PropAccess
              && p.expression === this
              && (p1 = output.parent(1)) instanceof AST_Assign
              && p1.left === p;
      });
  
      PARENS(AST_New, function(output){
          var p = output.parent();
          if (!need_constructor_parens(this, output)
              && (p instanceof AST_PropAccess // (new Date).getTime(), (new Date)["getTime"]()
                  || p instanceof AST_Call && p.expression === this)) // (new foo)(bar)
              return true;
      });
  
      PARENS(AST_Number, function(output){
          var p = output.parent();
          if (p instanceof AST_PropAccess && p.expression === this) {
              var value = this.getValue();
              if (value < 0 || /^0/.test(make_num(value))) {
                  return true;
              }
          }
      });
  
      PARENS([ AST_Assign, AST_Conditional ], function (output){
          var p = output.parent();
          // !(a = false) → true
          if (p instanceof AST_Unary)
              return true;
          // 1 + (a = 2) + 3 → 6, side effect setting a = 2
          if (p instanceof AST_Binary && !(p instanceof AST_Assign))
              return true;
          // (a = func)() —or— new (a = Object)()
          if (p instanceof AST_Call && p.expression === this)
              return true;
          // (a = foo) ? bar : baz
          if (p instanceof AST_Conditional && p.condition === this)
              return true;
          // (a = foo)["prop"] —or— (a = foo).prop
          if (p instanceof AST_PropAccess && p.expression === this)
              return true;
      });
  
      /* -----[ PRINTERS ]----- */
  
      DEFPRINT(AST_Directive, function(self, output){
          output.print_string(self.value, self.quote);
          output.semicolon();
      });
      DEFPRINT(AST_Debugger, function(self, output){
          output.print("debugger");
          output.semicolon();
      });
  
      /* -----[ statements ]----- */
  
      function display_body(body, is_toplevel, output, allow_directives) {
          var last = body.length - 1;
          in_directive = allow_directives;
          body.forEach(function(stmt, i){
              if (in_directive === true && !(stmt instanceof AST_Directive ||
                  stmt instanceof AST_EmptyStatement ||
                  (stmt instanceof AST_SimpleStatement && stmt.body instanceof AST_String)
              )) {
                  in_directive = false;
              }
              if (!(stmt instanceof AST_EmptyStatement)) {
                  output.indent();
                  stmt.print(output);
                  if (!(i == last && is_toplevel)) {
                      output.newline();
                      if (is_toplevel) output.newline();
                  }
              }
              if (in_directive === true &&
                  stmt instanceof AST_SimpleStatement &&
                  stmt.body instanceof AST_String
              ) {
                  in_directive = false;
              }
          });
          in_directive = false;
      };
  
      AST_StatementWithBody.DEFMETHOD("_do_print_body", function(output){
          force_statement(this.body, output);
      });
  
      DEFPRINT(AST_Statement, function(self, output){
          self.body.print(output);
          output.semicolon();
      });
      DEFPRINT(AST_Toplevel, function(self, output){
          display_body(self.body, true, output, true);
          output.print("");
      });
      DEFPRINT(AST_LabeledStatement, function(self, output){
          self.label.print(output);
          output.colon();
          self.body.print(output);
      });
      DEFPRINT(AST_SimpleStatement, function(self, output){
          self.body.print(output);
          output.semicolon();
      });
      function print_bracketed(body, output, allow_directives) {
          if (body.length > 0) output.with_block(function(){
              display_body(body, false, output, allow_directives);
          });
          else output.print("{}");
      };
      DEFPRINT(AST_BlockStatement, function(self, output){
          print_bracketed(self.body, output);
      });
      DEFPRINT(AST_EmptyStatement, function(self, output){
          output.semicolon();
      });
      DEFPRINT(AST_Do, function(self, output){
          output.print("do");
          output.space();
          self._do_print_body(output);
          output.space();
          output.print("while");
          output.space();
          output.with_parens(function(){
              self.condition.print(output);
          });
          output.semicolon();
      });
      DEFPRINT(AST_While, function(self, output){
          output.print("while");
          output.space();
          output.with_parens(function(){
              self.condition.print(output);
          });
          output.space();
          self._do_print_body(output);
      });
      DEFPRINT(AST_For, function(self, output){
          output.print("for");
          output.space();
          output.with_parens(function(){
              if (self.init && !(self.init instanceof AST_EmptyStatement)) {
                  if (self.init instanceof AST_Definitions) {
                      self.init.print(output);
                  } else {
                      parenthesize_for_noin(self.init, output, true);
                  }
                  output.print(";");
                  output.space();
              } else {
                  output.print(";");
              }
              if (self.condition) {
                  self.condition.print(output);
                  output.print(";");
                  output.space();
              } else {
                  output.print(";");
              }
              if (self.step) {
                  self.step.print(output);
              }
          });
          output.space();
          self._do_print_body(output);
      });
      DEFPRINT(AST_ForIn, function(self, output){
          output.print("for");
          output.space();
          output.with_parens(function(){
              self.init.print(output);
              output.space();
              output.print("in");
              output.space();
              self.object.print(output);
          });
          output.space();
          self._do_print_body(output);
      });
      DEFPRINT(AST_With, function(self, output){
          output.print("with");
          output.space();
          output.with_parens(function(){
              self.expression.print(output);
          });
          output.space();
          self._do_print_body(output);
      });
  
      /* -----[ functions ]----- */
      AST_Lambda.DEFMETHOD("_do_print", function(output, nokeyword){
          var self = this;
          if (!nokeyword) {
              output.print("function");
          }
          if (self.name) {
              output.space();
              self.name.print(output);
          }
          output.with_parens(function(){
              self.argnames.forEach(function(arg, i){
                  if (i) output.comma();
                  arg.print(output);
              });
          });
          output.space();
          print_bracketed(self.body, output, true);
      });
      DEFPRINT(AST_Lambda, function(self, output){
          self._do_print(output);
      });
  
      /* -----[ exits ]----- */
      AST_Exit.DEFMETHOD("_do_print", function(output, kind){
          output.print(kind);
          if (this.value) {
              output.space();
              this.value.print(output);
          }
          output.semicolon();
      });
      DEFPRINT(AST_Return, function(self, output){
          self._do_print(output, "return");
      });
      DEFPRINT(AST_Throw, function(self, output){
          self._do_print(output, "throw");
      });
  
      /* -----[ loop control ]----- */
      AST_LoopControl.DEFMETHOD("_do_print", function(output, kind){
          output.print(kind);
          if (this.label) {
              output.space();
              this.label.print(output);
          }
          output.semicolon();
      });
      DEFPRINT(AST_Break, function(self, output){
          self._do_print(output, "break");
      });
      DEFPRINT(AST_Continue, function(self, output){
          self._do_print(output, "continue");
      });
  
      /* -----[ if ]----- */
      function make_then(self, output) {
          if (output.option("bracketize")) {
              make_block(self.body, output);
              return;
          }
          // 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.
          if (!self.body)
              return output.force_semicolon();
          if (self.body instanceof AST_Do) {
              // Unconditionally use the if/do-while workaround for all browsers.
              // 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
              make_block(self.body, output);
              return;
          }
          var b = self.body;
          while (true) {
              if (b instanceof AST_If) {
                  if (!b.alternative) {
                      make_block(self.body, output);
                      return;
                  }
                  b = b.alternative;
              }
              else if (b instanceof AST_StatementWithBody) {
                  b = b.body;
              }
              else break;
          }
          force_statement(self.body, output);
      };
      DEFPRINT(AST_If, function(self, output){
          output.print("if");
          output.space();
          output.with_parens(function(){
              self.condition.print(output);
          });
          output.space();
          if (self.alternative) {
              make_then(self, output);
              output.space();
              output.print("else");
              output.space();
              force_statement(self.alternative, output);
          } else {
              self._do_print_body(output);
          }
      });
  
      /* -----[ switch ]----- */
      DEFPRINT(AST_Switch, function(self, output){
          output.print("switch");
          output.space();
          output.with_parens(function(){
              self.expression.print(output);
          });
          output.space();
          if (self.body.length > 0) output.with_block(function(){
              self.body.forEach(function(stmt, i){
                  if (i) output.newline();
                  output.indent(true);
                  stmt.print(output);
              });
          });
          else output.print("{}");
      });
      AST_SwitchBranch.DEFMETHOD("_do_print_body", function(output){
          if (this.body.length > 0) {
              output.newline();
              this.body.forEach(function(stmt){
                  output.indent();
                  stmt.print(output);
                  output.newline();
              });
          }
      });
      DEFPRINT(AST_Default, function(self, output){
          output.print("default:");
          self._do_print_body(output);
      });
      DEFPRINT(AST_Case, function(self, output){
          output.print("case");
          output.space();
          self.expression.print(output);
          output.print(":");
          self._do_print_body(output);
      });
  
      /* -----[ exceptions ]----- */
      DEFPRINT(AST_Try, function(self, output){
          output.print("try");
          output.space();
          print_bracketed(self.body, output);
          if (self.bcatch) {
              output.space();
              self.bcatch.print(output);
          }
          if (self.bfinally) {
              output.space();
              self.bfinally.print(output);
          }
      });
      DEFPRINT(AST_Catch, function(self, output){
          output.print("catch");
          output.space();
          output.with_parens(function(){
              self.argname.print(output);
          });
          output.space();
          print_bracketed(self.body, output);
      });
      DEFPRINT(AST_Finally, function(self, output){
          output.print("finally");
          output.space();
          print_bracketed(self.body, output);
      });
  
      /* -----[ var/const ]----- */
      AST_Definitions.DEFMETHOD("_do_print", function(output, kind){
          output.print(kind);
          output.space();
          this.definitions.forEach(function(def, i){
              if (i) output.comma();
              def.print(output);
          });
          var p = output.parent();
          var in_for = p instanceof AST_For || p instanceof AST_ForIn;
          var avoid_semicolon = in_for && p.init === this;
          if (!avoid_semicolon)
              output.semicolon();
      });
      DEFPRINT(AST_Var, function(self, output){
          self._do_print(output, "var");
      });
      DEFPRINT(AST_Const, function(self, output){
          self._do_print(output, "const");
      });
  
      function parenthesize_for_noin(node, output, noin) {
          if (!noin) node.print(output);
          else try {
              // need to take some precautions here:
              //    https://github.com/mishoo/UglifyJS2/issues/60
              node.walk(new TreeWalker(function(node){
                  if (node instanceof AST_Binary && node.operator == "in")
                      throw output;
              }));
              node.print(output);
          } catch(ex) {
              if (ex !== output) throw ex;
              node.print(output, true);
          }
      };
  
      DEFPRINT(AST_VarDef, function(self, output){
          self.name.print(output);
          if (self.value) {
              output.space();
              output.print("=");
              output.space();
              var p = output.parent(1);
              var noin = p instanceof AST_For || p instanceof AST_ForIn;
              parenthesize_for_noin(self.value, output, noin);
          }
      });
  
      /* -----[ other expressions ]----- */
      DEFPRINT(AST_Call, function(self, output){
          self.expression.print(output);
          if (self instanceof AST_New && !need_constructor_parens(self, output))
              return;
          output.with_parens(function(){
              self.args.forEach(function(expr, i){
                  if (i) output.comma();
                  expr.print(output);
              });
          });
      });
      DEFPRINT(AST_New, function(self, output){
          output.print("new");
          output.space();
          AST_Call.prototype._codegen(self, output);
      });
  
      AST_Seq.DEFMETHOD("_do_print", function(output){
          this.car.print(output);
          if (this.cdr) {
              output.comma();
              if (output.should_break()) {
                  output.newline();
                  output.indent();
              }
              this.cdr.print(output);
          }
      });
      DEFPRINT(AST_Seq, function(self, output){
          self._do_print(output);
          // var p = output.parent();
          // if (p instanceof AST_Statement) {
          //     output.with_indent(output.next_indent(), function(){
          //         self._do_print(output);
          //     });
          // } else {
          //     self._do_print(output);
          // }
      });
      DEFPRINT(AST_Dot, function(self, output){
          var expr = self.expression;
          expr.print(output);
          if (expr instanceof AST_Number && expr.getValue() >= 0) {
              if (!/[xa-f.)]/i.test(output.last())) {
                  output.print(".");
              }
          }
          output.print(".");
          // the name after dot would be mapped about here.
          output.add_mapping(self.end);
          output.print_name(self.property);
      });
      DEFPRINT(AST_Sub, function(self, output){
          self.expression.print(output);
          output.print("[");
          self.property.print(output);
          output.print("]");
      });
      DEFPRINT(AST_UnaryPrefix, function(self, output){
          var op = self.operator;
          output.print(op);
          if (/^[a-z]/i.test(op)
              || (/[+-]$/.test(op)
                  && self.expression instanceof AST_UnaryPrefix
                  && /^[+-]/.test(self.expression.operator))) {
              output.space();
          }
          self.expression.print(output);
      });
      DEFPRINT(AST_UnaryPostfix, function(self, output){
          self.expression.print(output);
          output.print(self.operator);
      });
      DEFPRINT(AST_Binary, function(self, output){
          var op = self.operator;
          self.left.print(output);
          if (op[0] == ">" /* ">>" ">>>" ">" ">=" */
              && self.left instanceof AST_UnaryPostfix
              && self.left.operator == "--") {
              // space is mandatory to avoid outputting -->
              output.print(" ");
          } else {
              // the space is optional depending on "beautify"
              output.space();
          }
          output.print(op);
          if ((op == "<" || op == "<<")
              && self.right instanceof AST_UnaryPrefix
              && self.right.operator == "!"
              && self.right.expression instanceof AST_UnaryPrefix
              && self.right.expression.operator == "--") {
              // space is mandatory to avoid outputting <!--
              output.print(" ");
          } else {
              // the space is optional depending on "beautify"
              output.space();
          }
          self.right.print(output);
      });
      DEFPRINT(AST_Conditional, function(self, output){
          self.condition.print(output);
          output.space();
          output.print("?");
          output.space();
          self.consequent.print(output);
          output.space();
          output.colon();
          self.alternative.print(output);
      });
  
      /* -----[ literals ]----- */
      DEFPRINT(AST_Array, function(self, output){
          output.with_square(function(){
              var a = self.elements, len = a.length;
              if (len > 0) output.space();
              a.forEach(function(exp, i){
                  if (i) output.comma();
                  exp.print(output);
                  // If the final element is a hole, we need to make sure it
                  // doesn't look like a trailing comma, by inserting an actual
                  // trailing comma.
                  if (i === len - 1 && exp instanceof AST_Hole)
                    output.comma();
              });
              if (len > 0) output.space();
          });
      });
      DEFPRINT(AST_Object, function(self, output){
          if (self.properties.length > 0) output.with_block(function(){
              self.properties.forEach(function(prop, i){
                  if (i) {
                      output.print(",");
                      output.newline();
                  }
                  output.indent();
                  prop.print(output);
              });
              output.newline();
          });
          else output.print("{}");
      });
      DEFPRINT(AST_ObjectKeyVal, function(self, output){
          var key = self.key;
          var quote = self.quote;
          if (output.option("quote_keys")) {
              output.print_string(key + "");
          } else if ((typeof key == "number"
                      || !output.option("beautify")
                      && +key + "" == key)
                     && parseFloat(key) >= 0) {
              output.print(make_num(key));
          } else if (RESERVED_WORDS(key) ? output.option("screw_ie8") : is_identifier_string(key)) {
              if (quote && output.option("keep_quoted_props")) {
                  output.print_string(key, quote);
              } else {
                  output.print_name(key);
              }
          } else {
              output.print_string(key, quote);
          }
          output.colon();
          self.value.print(output);
      });
      DEFPRINT(AST_ObjectSetter, function(self, output){
          output.print("set");
          output.space();
          self.key.print(output);
          self.value._do_print(output, true);
      });
      DEFPRINT(AST_ObjectGetter, function(self, output){
          output.print("get");
          output.space();
          self.key.print(output);
          self.value._do_print(output, true);
      });
      DEFPRINT(AST_Symbol, function(self, output){
          var def = self.definition();
          output.print_name(def ? def.mangled_name || def.name : self.name);
      });
      DEFPRINT(AST_Undefined, function(self, output){
          output.print("void 0");
      });
      DEFPRINT(AST_Hole, noop);
      DEFPRINT(AST_Infinity, function(self, output){
          output.print("Infinity");
      });
      DEFPRINT(AST_NaN, function(self, output){
          output.print("NaN");
      });
      DEFPRINT(AST_This, function(self, output){
          output.print("this");
      });
      DEFPRINT(AST_Constant, function(self, output){
          output.print(self.getValue());
      });
      DEFPRINT(AST_String, function(self, output){
          output.print_string(self.getValue(), self.quote, in_directive);
      });
      DEFPRINT(AST_Number, function(self, output){
          if (use_asm && self.start && self.start.raw != null) {
              output.print(self.start.raw);
          } else {
              output.print(make_num(self.getValue()));
          }
      });
  
      function regexp_safe_literal(code) {
          return [
              0x5c   , // \
              0x2f   , // /
              0x2e   , // .
              0x2b   , // +
              0x2a   , // *
              0x3f   , // ?
              0x28   , // (
              0x29   , // )
              0x5b   , // [
              0x5d   , // ]
              0x7b   , // {
              0x7d   , // }
              0x24   , // $
              0x5e   , // ^
              0x3a   , // :
              0x7c   , // |
              0x21   , // !
              0x0a   , // \n
              0x0d   , // \r
              0x00   , // \0
              0xfeff , // Unicode BOM
              0x2028 , // unicode "line separator"
              0x2029 , // unicode "paragraph separator"
          ].indexOf(code) < 0;
      };
  
      DEFPRINT(AST_RegExp, function(self, output){
          var str = self.getValue().toString();
          if (output.option("ascii_only")) {
              str = output.to_ascii(str);
          } else if (output.option("unescape_regexps")) {
              str = str.split("\\\\").map(function(str){
                  return str.replace(/\\u[0-9a-fA-F]{4}|\\x[0-9a-fA-F]{2}/g, function(s){
                      var code = parseInt(s.substr(2), 16);
                      return regexp_safe_literal(code) ? String.fromCharCode(code) : s;
                  });
              }).join("\\\\");
          }
          output.print(str);
          var p = output.parent();
          if (p instanceof AST_Binary && /^in/.test(p.operator) && p.left === self)
              output.print(" ");
      });
  
      function force_statement(stat, output) {
          if (output.option("bracketize")) {
              if (!stat || stat instanceof AST_EmptyStatement)
                  output.print("{}");
              else if (stat instanceof AST_BlockStatement)
                  stat.print(output);
              else output.with_block(function(){
                  output.indent();
                  stat.print(output);
                  output.newline();
              });
          } else {
              if (!stat || stat instanceof AST_EmptyStatement)
                  output.force_semicolon();
              else
                  stat.print(output);
          }
      };
  
      // return true if the node at the top of the stack (that means the
      // innermost node in the current output) is lexically the first in
      // a statement.
      function first_in_statement(output) {
          var a = output.stack(), i = a.length, node = a[--i], p = a[--i];
          while (i > 0) {
              if (p instanceof AST_Statement && p.body === node)
                  return true;
              if ((p instanceof AST_Seq           && p.car === node        ) ||
                  (p instanceof AST_Call          && p.expression === node && !(p instanceof AST_New) ) ||
                  (p instanceof AST_Dot           && p.expression === node ) ||
                  (p instanceof AST_Sub           && p.expression === node ) ||
                  (p instanceof AST_Conditional   && p.condition === node  ) ||
                  (p instanceof AST_Binary        && p.left === node       ) ||
                  (p instanceof AST_UnaryPostfix  && p.expression === node ))
              {
                  node = p;
                  p = a[--i];
              } else {
                  return false;
              }
          }
      };
  
      // self should be AST_New.  decide if we want to show parens or not.
      function need_constructor_parens(self, output) {
          // Always print parentheses with arguments
          if (self.args.length > 0) return true;
  
          return output.option("beautify");
      };
  
      function best_of(a) {
          var best = a[0], len = best.length;
          for (var i = 1; i < a.length; ++i) {
              if (a[i].length < len) {
                  best = a[i];
                  len = best.length;
              }
          }
          return best;
      };
  
      function make_num(num) {
          var str = num.toString(10), a = [ str.replace(/^0\./, ".").replace('e+', 'e') ], m;
          if (Math.floor(num) === num) {
              if (num >= 0) {
                  a.push("0x" + num.toString(16).toLowerCase(), // probably pointless
                         "0" + num.toString(8)); // same.
              } else {
                  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);
      };
  
      function make_block(stmt, output) {
          if (stmt instanceof AST_BlockStatement) {
              stmt.print(output);
              return;
          }
          output.with_block(function(){
              output.indent();
              stmt.print(output);
              output.newline();
          });
      };
  
      /* -----[ source map generators ]----- */
  
      function DEFMAP(nodetype, generator) {
          nodetype.DEFMETHOD("add_source_map", function(stream){
              generator(this, stream);
          });
      };
  
      // We could easily add info for ALL nodes, but it seems to me that
      // would be quite wasteful, hence this noop in the base class.
      DEFMAP(AST_Node, noop);
  
      function basic_sourcemap_gen(self, output) {
          output.add_mapping(self.start);
      };
  
      // XXX: I'm not exactly sure if we need it for all of these nodes,
      // or if we should add even more.
  
      DEFMAP(AST_Directive, basic_sourcemap_gen);
      DEFMAP(AST_Debugger, basic_sourcemap_gen);
      DEFMAP(AST_Symbol, basic_sourcemap_gen);
      DEFMAP(AST_Jump, basic_sourcemap_gen);
      DEFMAP(AST_StatementWithBody, basic_sourcemap_gen);
      DEFMAP(AST_LabeledStatement, noop); // since the label symbol will mark it
      DEFMAP(AST_Lambda, basic_sourcemap_gen);
      DEFMAP(AST_Switch, basic_sourcemap_gen);
      DEFMAP(AST_SwitchBranch, basic_sourcemap_gen);
      DEFMAP(AST_BlockStatement, basic_sourcemap_gen);
      DEFMAP(AST_Toplevel, noop);
      DEFMAP(AST_New, basic_sourcemap_gen);
      DEFMAP(AST_Try, basic_sourcemap_gen);
      DEFMAP(AST_Catch, basic_sourcemap_gen);
      DEFMAP(AST_Finally, basic_sourcemap_gen);
      DEFMAP(AST_Definitions, basic_sourcemap_gen);
      DEFMAP(AST_Constant, basic_sourcemap_gen);
      DEFMAP(AST_ObjectSetter, function(self, output){
          output.add_mapping(self.start, self.key.name);
      });
      DEFMAP(AST_ObjectGetter, function(self, output){
          output.add_mapping(self.start, self.key.name);
      });
      DEFMAP(AST_ObjectProperty, function(self, output){
          output.add_mapping(self.start, self.key);
      });
  
  })();
  