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      /*
        Copyright (C) 2012 John Freeman <jfreeman08@gmail.com>
        Copyright (C) 2012 Ariya Hidayat <ariya.hidayat@gmail.com>
        Copyright (C) 2012 Mathias Bynens <mathias@qiwi.be>
        Copyright (C) 2012 Joost-Wim Boekesteijn <joost-wim@boekesteijn.nl>
        Copyright (C) 2012 Kris Kowal <kris.kowal@cixar.com>
        Copyright (C) 2012 Yusuke Suzuki <utatane.tea@gmail.com>
        Copyright (C) 2012 Arpad Borsos <arpad.borsos@googlemail.com>
        Copyright (C) 2011 Ariya Hidayat <ariya.hidayat@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 HOLDERS AND CONTRIBUTORS "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 <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.
      */

      /*jslint bitwise:true */
      /*global escodegen:true, exports:true, generateStatement: true*/

      (function (exports) {
          'use strict';

          var Syntax,
              Precedence,
              BinaryPrecedence,
              VisitorKeys,
              VisitorOption,
              isArray,
              base,
              indent,
              extra,
              parse;

          Syntax = {
              AssignmentExpression: 'AssignmentExpression',
              ArrayExpression: 'ArrayExpression',
              BlockStatement: 'BlockStatement',
              BinaryExpression: 'BinaryExpression',
              BreakStatement: 'BreakStatement',
              CallExpression: 'CallExpression',
              CatchClause: 'CatchClause',
              ConditionalExpression: 'ConditionalExpression',
              ContinueStatement: 'ContinueStatement',
              DoWhileStatement: 'DoWhileStatement',
              DebuggerStatement: 'DebuggerStatement',
              EmptyStatement: 'EmptyStatement',
              ExpressionStatement: 'ExpressionStatement',
              ForStatement: 'ForStatement',
              ForInStatement: 'ForInStatement',
              FunctionDeclaration: 'FunctionDeclaration',
              FunctionExpression: 'FunctionExpression',
              Identifier: 'Identifier',
              IfStatement: 'IfStatement',
              Literal: 'Literal',
              LabeledStatement: 'LabeledStatement',
              LogicalExpression: 'LogicalExpression',
              MemberExpression: 'MemberExpression',
              NewExpression: 'NewExpression',
              ObjectExpression: 'ObjectExpression',
              Program: 'Program',
              Property: 'Property',
              ReturnStatement: 'ReturnStatement',
              SequenceExpression: 'SequenceExpression',
              SwitchStatement: 'SwitchStatement',
              SwitchCase: 'SwitchCase',
              ThisExpression: 'ThisExpression',
              ThrowStatement: 'ThrowStatement',
              TryStatement: 'TryStatement',
              UnaryExpression: 'UnaryExpression',
              UpdateExpression: 'UpdateExpression',
              VariableDeclaration: 'VariableDeclaration',
              VariableDeclarator: 'VariableDeclarator',
              WhileStatement: 'WhileStatement',
              WithStatement: 'WithStatement'
          };

          Precedence = {
              Sequence: 0,
              Assignment: 1,
              Conditional: 2,
              LogicalOR: 3,
              LogicalAND: 4,
              LogicalXOR: 5,
              BitwiseOR: 6,
              BitwiseAND: 7,
              Equality: 8,
              Relational: 9,
              BitwiseSHIFT: 10,
              Additive: 11,
              Multiplicative: 12,
              Unary: 13,
              Postfix: 14,
              Call: 15,
              New: 16,
              Member: 17,
              Primary: 18
          };

          BinaryPrecedence = {
              '||': Precedence.LogicalOR,
              '&&': Precedence.LogicalAND,
              '^': Precedence.LogicalXOR,
              '|': Precedence.BitwiseOR,
              '&': Precedence.BitwiseAND,
              '==': Precedence.Equality,
              '!=': Precedence.Equality,
              '===': Precedence.Equality,
              '!==': Precedence.Equality,
              '<': Precedence.Relational,
              '>': Precedence.Relational,
              '<=': Precedence.Relational,
              '>=': Precedence.Relational,
              'in': Precedence.Relational,
              'instanceof': Precedence.Relational,
              '<<': Precedence.BitwiseSHIFT,
              '>>': Precedence.BitwiseSHIFT,
              '>>>': Precedence.BitwiseSHIFT,
              '+': Precedence.Additive,
              '-': Precedence.Additive,
              '*': Precedence.Multiplicative,
              '%': Precedence.Multiplicative,
              '/': Precedence.Multiplicative
          };

          function getDefaultOptions() {
              // default options
              return {
                  indent: null,
                  base: null,
                  parse: null,
                  comment: false,
                  format: {
                      indent: {
                          style: '    ',
                          base: 0,
                          adjustMultilineComment: false
                      }
                  }
              };
          }

          function unicodeEscape(ch) {
              var result, i;
              result = ch.charCodeAt(0).toString(16);
              for (i = result.length; i < 4; i += 1) {
                  result = '0' + result;
              }
              return '\\u' + result;
          }

          function stringToArray(str) {
              var length = str.length,
                  result = [],
                  i;
              for (i = 0; i < length; i += 1) {
                  result[i] = str.charAt(i);
              }
              return result;
          }

          function stringRepeat(str, num) {
              var result = '';

              for (num |= 0; num > 0; num >>>= 1, str += str) {
                  if (num & 1) {
                      result += str;
                  }
              }

              return result;
          }

          isArray = Array.isArray;
          if (!isArray) {
              isArray = function isArray(array) {
                  return Object.prototype.toString.call(array) === '[object Array]';
              };
          }

          function endsWithLineTerminator(value) {
              return (/(?:\r\n|[\n\r])$/).test(value);
          }

          function shallowCopy(obj) {
              var ret = {}, key;
              for (key in obj) {
                  if (obj.hasOwnProperty(key)) {
                      ret[key] = obj[key];
                  }
              }
              return ret;
          }

          function deepCopy(obj) {
              var ret = {}, key, val;
              for (key in obj) {
                  if (obj.hasOwnProperty(key)) {
                      val = obj[key];
                      if (typeof val === 'object' && val !== null) {
                          ret[key] = deepCopy(val);
                      } else {
                          ret[key] = val;
                      }
                  }
              }
              return ret;
          }

          function updateDeeply(target, override) {
              var key, val;

              function isHashObject(target) {
                  return typeof target === 'object' && target instanceof Object && !(target instanceof RegExp);
              }

              for (key in override) {
                  if (override.hasOwnProperty(key)) {
                      val = override[key];
                      if (isHashObject(val)) {
                          if (isHashObject(target[key])) {
                              updateDeeply(target[key], val);
                          } else {
                              target[key] = updateDeeply({}, val);
                          }
                      } else {
                          target[key] = val;
                      }
                  }
              }
              return target;
          }

          function escapeString(str) {
              var result = '', i, len, ch;

              if (typeof str[0] === 'undefined') {
                  str = stringToArray(str);
              }

              for (i = 0, len = str.length; i < len; i += 1) {
                  ch = str[i];
                  if ('\'\\\b\f\n\r\t'.indexOf(ch) >= 0) {
                      result += '\\';
                      switch (ch) {
                      case '\'':
                          result += '\'';
                          break;
                      case '\\':
                          result += '\\';
                          break;
                      case '\b':
                          result += 'b';
                          break;
                      case '\f':
                          result += 'f';
                          break;
                      case '\n':
                          result += 'n';
                          break;
                      case '\r':
                          result += 'r';
                          break;
                      case '\t':
                          result += 't';
                          break;
                      }
                  } else if (ch < ' ' || ch.charCodeAt(0) >= 0x80) {
                      result += unicodeEscape(ch);
                  } else {
                      result += ch;
                  }
              }

              return '\'' + result + '\'';
          }

          function isWhiteSpace(ch) {
              return (ch === ' ') || (ch === '\u0009') || (ch === '\u000B') ||
                  (ch === '\u000C') || (ch === '\u00A0') ||
                  (ch.charCodeAt(0) >= 0x1680 &&
                   '\u1680\u180E\u2000\u2001\u2002\u2003\u2004\u2005\u2006\u2007\u2008\u2009\u200A\u202F\u205F\u3000\uFEFF'.indexOf(ch) >= 0);
          }

          function addIndent(stmt) {
              return base + stmt;
          }

          function adjustMultilineComment(value) {
              var array, i, len, line, j, ch, spaces;

              spaces = Number.MAX_VALUE;
              array = value.split(/\r\n|[\r\n]/);

              // first line doesn't have indentation
              for (i = 1, len = array.length; i < len; i += 1) {
                  line = array[i];
                  j = 0;
                  while (j < line.length && isWhiteSpace(line[j])) {
                      j += 1;
                  }
                  if (spaces > j) {
                      spaces = j;
                  }
              }

              if (spaces % 2 === 1) {
                  // /*
                  //  *
                  //  */
                  // If spaces are odd number, above pattern is considered.
                  // We waste 1 space.
                  spaces -= 1;
              }
              for (i = 1, len = array.length; i < len; i += 1) {
                  array[i] = addIndent(array[i].slice(spaces));
              }
              return array.join('\n');
          }

          function generateComment(comment) {
              if (comment.type === 'Line') {
                  // Esprima always produce last line comment with LineTerminator
                  return '//' + comment.value;
              }
              if (extra.format.indent.adjustMultilineComment && /[\n\r]/.test(comment.value)) {
                  return adjustMultilineComment('/*' + comment.value + '*/');
              }
              return '/*' + comment.value + '*/';
          }

          function parenthesize(text, current, should) {
              if (current < should) {
                  return '(' + text + ')';
              }
              return text;
          }

          function maybeBlock(stmt, suffix) {
              var previousBase, result;

              if (stmt.type === Syntax.BlockStatement && (!extra.comment || !stmt.leadingComments)) {
                  result = ' ' + generateStatement(stmt);
                  if (suffix) {
                      return result + ' ';
                  }
                  return result;
              }

              if (stmt.type === Syntax.EmptyStatement && (!extra.comment || !stmt.leadingComments)) {
                  result = ';';
              } else {
                  previousBase = base;
                  base += indent;
                  result = '\n' + addIndent(generateStatement(stmt));
                  base = previousBase;
              }

              if (suffix) {
                  return result + '\n' + addIndent('');
              }
              return result;
          }

          function generateFunctionBody(node) {
              var result, i, len;
              result = '(';
              for (i = 0, len = node.params.length; i < len; i += 1) {
                  result += node.params[i].name;
                  if ((i + 1) < len) {
                      result += ', ';
                  }
              }
              return result + ')' + maybeBlock(node.body);
          }

          function generateExpression(expr, option) {
              var result, precedence, currentPrecedence, previousBase, i, len, raw, allowIn;

              precedence = option.precedence;
              allowIn = option.allowIn;

              switch (expr.type) {
              case Syntax.SequenceExpression:
                  result = '';
                  allowIn |= (Precedence.Sequence < precedence);
                  for (i = 0, len = expr.expressions.length; i < len; i += 1) {
                      result += generateExpression(expr.expressions[i], {
                          precedence: Precedence.Assignment,
                          allowIn: allowIn
                      });
                      if ((i + 1) < len) {
                          result += ', ';
                      }
                  }
                  result = parenthesize(result, Precedence.Sequence, precedence);
                  break;

              case Syntax.AssignmentExpression:
                  allowIn |= (Precedence.Assignment < precedence);
                  result = parenthesize(
                          generateExpression(expr.left, {
                              precedence: Precedence.Call,
                              allowIn: allowIn
                          }) + ' ' + expr.operator + ' ' +
                          generateExpression(expr.right, {
                              precedence: Precedence.Assignment,
                              allowIn: allowIn
                          }),
                      Precedence.Assignment,
                      precedence
                  );
                  break;

              case Syntax.ConditionalExpression:
                  allowIn |= (Precedence.Conditional < precedence);
                  result = parenthesize(
                          generateExpression(expr.test, {
                              precedence: Precedence.LogicalOR,
                              allowIn: allowIn
                          }) + ' ? ' +
                          generateExpression(expr.consequent, {
                              precedence: Precedence.Assignment,
                              allowIn: allowIn
                          }) + ' : ' +
                          generateExpression(expr.alternate, {
                              precedence: Precedence.Assignment,
                              allowIn: allowIn
                          }),
                      Precedence.Conditional,
                      precedence
                  );
                  break;

              case Syntax.LogicalExpression:
              case Syntax.BinaryExpression:
                  currentPrecedence = BinaryPrecedence[expr.operator];

                  allowIn |= (currentPrecedence < precedence);

                  result =
                      generateExpression(expr.left, {
                          precedence: currentPrecedence,
                          allowIn: allowIn
                      }) + ' ' + expr.operator + ' ' +
                      generateExpression(expr.right, {
                          precedence: currentPrecedence + 1,
                          allowIn: allowIn
                      });

                  if (expr.operator === 'in' && !allowIn) {
                      result = '(' + result + ')';
                  } else {
                      result = parenthesize(result, currentPrecedence, precedence);
                  }

                  break;

              case Syntax.CallExpression:
                  result = '';
                  for (i = 0, len = expr['arguments'].length; i < len; i += 1) {
                      result += generateExpression(expr['arguments'][i], {
                          precedence: Precedence.Assignment,
                          allowIn: true
                      });
                      if ((i + 1) < len) {
                          result += ', ';
                      }
                  }
                  result = parenthesize(
                      generateExpression(expr.callee, {
                          precedence: Precedence.Call,
                          allowIn: true
                      }) + '(' + result + ')',
                      Precedence.Call,
                      precedence
                  );
                  break;

              case Syntax.NewExpression:
                  result = '';
                  for (i = 0, len = expr['arguments'].length; i < len; i += 1) {
                      result += generateExpression(expr['arguments'][i], {
                          precedence: Precedence.Assignment,
                          allowIn: true
                      });
                      if ((i + 1) < len) {
                          result += ', ';
                      }
                  }
                  result = parenthesize(
                      'new ' + generateExpression(expr.callee, {
                          precedence: Precedence.New,
                          allowIn: true
                      }) + '(' + result + ')',
                      Precedence.New,
                      precedence
                  );
                  break;

              case Syntax.MemberExpression:
                  result = generateExpression(expr.object, {
                      precedence: Precedence.Call,
                      allowIn: true
                  });
                  if (expr.computed) {
                      result += '[' + generateExpression(expr.property, {
                          precedence: Precedence.Sequence,
                          allowIn: true
                      }) + ']';
                  } else {
                      if (expr.object.type === Syntax.Literal && typeof expr.object.value === 'number') {
                          if (result.indexOf('.') < 0) {
                              if (!/[eExX]/.test(result) && !(result.length >= 2 && result[0] === '0')) {
                                  result += '.';
                              }
                          }
                      }
                      result += '.' + expr.property.name;
                  }
                  result = parenthesize(result, Precedence.Member, precedence);
                  break;

              case Syntax.UnaryExpression:
                  result = expr.operator;
                  if (result.length > 2) {
                      result += ' ';
                  }
                  result = parenthesize(
                      result + generateExpression(expr.argument, {
                          precedence: Precedence.Unary + (
                                  expr.argument.type === Syntax.UnaryExpression &&
                                  expr.operator.length < 3 &&
                                  expr.argument.operator === expr.operator ? 1 : 0
                              ),
                          allowIn: true
                          }),
                      Precedence.Unary,
                      precedence
                  );
                  break;

              case Syntax.UpdateExpression:
                  if (expr.prefix) {
                      result = parenthesize(
                          expr.operator +
                              generateExpression(expr.argument, {
                                  precedence: Precedence.Unary,
                                  allowIn: true
                              }),
                          Precedence.Unary,
                          precedence
                      );
                  } else {
                      result = parenthesize(
                          generateExpression(expr.argument, {
                              precedence: Precedence.Postfix,
                              allowIn: true
                          }) + expr.operator,
                          Precedence.Postfix,
                          precedence
                      );
                  }
                  break;

              case Syntax.FunctionExpression:
                  result = 'function ';
                  if (expr.id) {
                      result += expr.id.name;
                  }
                  result += generateFunctionBody(expr);
                  break;

              case Syntax.ArrayExpression:
                  if (!expr.elements.length) {
                      result = '[]';
                      break;
                  }
                  result = '[\n';
                  previousBase = base;
                  base += indent;
                  for (i = 0, len = expr.elements.length; i < len; i += 1) {
                      if (!expr.elements[i]) {
                          result += addIndent('');
                          if ((i + 1) === len) {
                              result += ',';
                          }
                      } else {
                          result += addIndent(generateExpression(expr.elements[i], {
                              precedence: Precedence.Assignment,
                              allowIn: true
                          }));
                      }
                      if ((i + 1) < len) {
                          result += ',\n';
                      }
                  }
                  base = previousBase;
                  result += '\n' + addIndent(']');
                  break;

              case Syntax.Property:
                  if (expr.kind === 'get' || expr.kind === 'set') {
                      result = expr.kind + ' ' + generateExpression(expr.key, {
                          precedence: Precedence.Sequence,
                          allowIn: true
                      }) + generateFunctionBody(expr.value);
                  } else {
                      result =
                          generateExpression(expr.key, {
                              precedence: Precedence.Sequence,
                              allowIn: true
                          }) + ': ' + generateExpression(expr.value, {
                              precedence: Precedence.Assignment,
                              allowIn: true
                          });
                  }
                  break;

              case Syntax.ObjectExpression:
                  if (!expr.properties.length) {
                      result = '{}';
                      break;
                  }
                  result = '{\n';
                  previousBase = base;
                  base += indent;
                  for (i = 0, len = expr.properties.length; i < len; i += 1) {
                      result += addIndent(generateExpression(expr.properties[i], {
                          precedence: Precedence.Sequence,
                          allowIn: true
                      }));
                      if ((i + 1) < len) {
                          result += ',\n';
                      }
                  }
                  base = previousBase;
                  result += '\n' + addIndent('}');
                  break;

              case Syntax.ThisExpression:
                  result = 'this';
                  break;

              case Syntax.Identifier:
                  result = expr.name;
                  break;

              case Syntax.Literal:
                  if (expr.hasOwnProperty('raw') && parse) {
                      try {
                          raw = parse(expr.raw).body[0].expression;
                          if (raw.type === Syntax.Literal) {
                              if (raw.value === expr.value) {
                                  result = expr.raw;
                                  break;
                              }
                          }
                      } catch (e) {
                          // not use raw property
                      }
                  }

                  if (expr.value === null) {
                      result = 'null';
                      break;
                  }

                  if (typeof expr.value === 'string') {
                      result = escapeString(expr.value);
                      break;
                  }

                  if (typeof expr.value === 'number' && expr.value === Infinity) {
                      // Infinity is variable
                      result = '1e+1000';
                      break;
                  }

                  result = expr.value.toString();
                  break;

              default:
                  break;
              }

              if (result === undefined) {
                  throw new Error('Unknown expression type: ' + expr.type);
              }
              return result;
          }

          function generateStatement(stmt, option) {
              var i, len, result, previousBase, comment, save, ret, node, allowIn;

              allowIn = true;
              if (option) {
                  allowIn = option.allowIn;
              }

              switch (stmt.type) {
              case Syntax.BlockStatement:
                  result = '{\n';

                  previousBase = base;
                  base += indent;
                  for (i = 0, len = stmt.body.length; i < len; i += 1) {
                      result += addIndent(generateStatement(stmt.body[i])) + '\n';
                  }
                  base = previousBase;

                  result += addIndent('}');
                  break;

              case Syntax.BreakStatement:
                  if (stmt.label) {
                      result = 'break ' + stmt.label.name + ';';
                  } else {
                      result = 'break;';
                  }
                  break;

              case Syntax.ContinueStatement:
                  if (stmt.label) {
                      result = 'continue ' + stmt.label.name + ';';
                  } else {
                      result = 'continue;';
                  }
                  break;

              case Syntax.DoWhileStatement:
                  result = 'do' + maybeBlock(stmt.body, true) + 'while (' + generateExpression(stmt.test, {
                      precedence: Precedence.Sequence,
                      allowIn: true
                  }) + ');';
                  break;

              case Syntax.CatchClause:
                  previousBase = base;
                  base += indent;
                  result = ' catch (' + generateExpression(stmt.param, {
                      precedence: Precedence.Sequence,
                      allowIn: true
                  }) + ')';
                  base = previousBase;
                  result += maybeBlock(stmt.body);
                  break;

              case Syntax.DebuggerStatement:
                  result = 'debugger;';
                  break;

              case Syntax.EmptyStatement:
                  result = ';';
                  break;

              case Syntax.ExpressionStatement:
                  result = generateExpression(stmt.expression, {
                      precedence: Precedence.Sequence,
                      allowIn: true
                  });
                  // 12.4 '{', 'function' is not allowed in this position.
                  // wrap espression with parentheses
                  if (result[0] === '{' || result.indexOf('function ') === 0) {
                      result = '(' + result + ');';
                  } else {
                      result += ';';
                  }
                  break;

              case Syntax.VariableDeclarator:
                  if (stmt.init) {
                      result = stmt.id.name + ' = ' + generateExpression(stmt.init, {
                          precedence: Precedence.Assignment,
                          allowIn: allowIn
                      });
                  } else {
                      result = stmt.id.name;
                  }
                  break;

              case Syntax.VariableDeclaration:
                  result = stmt.kind;
                  // special path for
                  // var x = function () {
                  // };
                  if (stmt.declarations.length === 1 && stmt.declarations[0].init &&
                          stmt.declarations[0].init.type === Syntax.FunctionExpression) {
                      result += ' ' + generateStatement(stmt.declarations[0]);
                  } else {
                      // VariableDeclarator is typed as Statement,
                      // but joined with comma (not LineTerminator).
                      // So if comment is attached to target node, we should specialize.
                      previousBase = base;
                      base += indent;

                      node = stmt.declarations[0];
                      if (extra.comment && node.leadingComments) {
                          result += '\n' + addIndent(generateStatement(node));
                      } else {
                          result += ' ' + generateStatement(node);
                      }

                      for (i = 1, len = stmt.declarations.length; i < len; i += 1) {
                          node = stmt.declarations[i];
                          if (extra.comment && node.leadingComments) {
                              result += ',\n' + addIndent(generateStatement(node));
                          } else {
                              result += ', ' + generateStatement(node);
                          }
                      }
                      base = previousBase;
                  }
                  result += ';';
                  break;

              case Syntax.ThrowStatement:
                  result = 'throw ' + generateExpression(stmt.argument, {
                      precedence: Precedence.Sequence,
                      allowIn: true
                  }) + ';';
                  break;

              case Syntax.TryStatement:
                  result = 'try' + maybeBlock(stmt.block);
                  for (i = 0, len = stmt.handlers.length; i < len; i += 1) {
                      result += generateStatement(stmt.handlers[i]);
                  }
                  if (stmt.finalizer) {
                      result += ' finally' + maybeBlock(stmt.finalizer);
                  }
                  break;

              case Syntax.SwitchStatement:
                  previousBase = base;
                  base += indent;
                  result = 'switch (' + generateExpression(stmt.discriminant, {
                      precedence: Precedence.Sequence,
                      allowIn: true
                  }) + ') {\n';
                  base = previousBase;
                  if (stmt.cases) {
                      for (i = 0, len = stmt.cases.length; i < len; i += 1) {
                          result += addIndent(generateStatement(stmt.cases[i])) + '\n';
                      }
                  }
                  result += addIndent('}');
                  break;

              case Syntax.SwitchCase:
                  previousBase = base;
                  base += indent;
                  if (stmt.test) {
                      result = 'case ' + generateExpression(stmt.test, {
                          precedence: Precedence.Sequence,
                          allowIn: true
                      }) + ':';
                  } else {
                      result = 'default:';
                  }

                  i = 0;
                  len = stmt.consequent.length;
                  if (len && stmt.consequent[0].type === Syntax.BlockStatement) {
                      result += maybeBlock(stmt.consequent[0]);
                      i = 1;
                  }

                  for (; i < len; i += 1) {
                      result += '\n' + addIndent(generateStatement(stmt.consequent[i]));
                  }

                  base = previousBase;
                  break;

              case Syntax.IfStatement:
                  if (stmt.alternate) {
                      if (stmt.alternate.type === Syntax.IfStatement) {
                          previousBase = base;
                          base += indent;
                          result = 'if (' +  generateExpression(stmt.test, {
                              precedence: Precedence.Sequence,
                              allowIn: true
                          }) + ')';
                          base = previousBase;
                          result += maybeBlock(stmt.consequent, true) + 'else ' + generateStatement(stmt.alternate);
                      } else {
                          previousBase = base;
                          base += indent;
                          result = 'if (' + generateExpression(stmt.test, {
                              precedence: Precedence.Sequence,
                              allowIn: true
                          }) + ')';
                          base = previousBase;
                          result += maybeBlock(stmt.consequent, true) + 'else' + maybeBlock(stmt.alternate);
                      }
                  } else {
                      previousBase = base;
                      base += indent;
                      result = 'if (' + generateExpression(stmt.test, {
                          precedence: Precedence.Sequence,
                          allowIn: true
                      }) + ')';
                      base = previousBase;
                      result += maybeBlock(stmt.consequent);
                  }
                  break;

              case Syntax.ForStatement:
                  previousBase = base;
                  base += indent;
                  result = 'for (';
                  if (stmt.init) {
                      if (stmt.init.type === Syntax.VariableDeclaration) {
                          result += generateStatement(stmt.init, {
                              allowIn: false
                          });
                      } else {
                          result += generateExpression(stmt.init, {
                              precedence: Precedence.Sequence,
                              allowIn: false
                          }) + ';';
                      }
                  } else {
                      result += ';';
                  }

                  if (stmt.test) {
                      result += ' ' + generateExpression(stmt.test, {
                          precedence: Precedence.Sequence,
                          allowIn: true
                      }) + ';';
                  } else {
                      result += ';';
                  }

                  if (stmt.update) {
                      result += ' ' + generateExpression(stmt.update, {
                          precedence: Precedence.Sequence,
                          allowIn: true
                      }) + ')';
                  } else {
                      result += ')';
                  }
                  base = previousBase;

                  result += maybeBlock(stmt.body);
                  break;

              case Syntax.ForInStatement:
                  result = 'for (';
                  if (stmt.left.type === Syntax.VariableDeclaration) {
                      previousBase = base;
                      base += indent + indent;
                      result += stmt.left.kind + ' ' + generateStatement(stmt.left.declarations[0], {
                          allowIn: false
                      });
                      base = previousBase;
                  } else {
                      previousBase = base;
                      base += indent;
                      result += generateExpression(stmt.left, {
                          precedence: Precedence.Call,
                          allowIn: true
                      });
                      base = previousBase;
                  }

                  previousBase = base;
                  base += indent;
                  result += ' in ' + generateExpression(stmt.right, {
                      precedence: Precedence.Sequence,
                      allowIn: true
                  }) + ')';
                  base = previousBase;
                  result += maybeBlock(stmt.body);
                  break;

              case Syntax.LabeledStatement:
                  result = stmt.label.name + ':' + maybeBlock(stmt.body);
                  break;

              case Syntax.Program:
                  result = '';
                  for (i = 0, len = stmt.body.length; i < len; i += 1) {
                      result += addIndent(generateStatement(stmt.body[i]));
                      if ((i + 1) < len) {
                          result += '\n';
                      }
                  }
                  break;

              case Syntax.FunctionDeclaration:
                  result = 'function ';
                  if (stmt.id) {
                      result += stmt.id.name;
                  }
                  result += generateFunctionBody(stmt);
                  break;

              case Syntax.ReturnStatement:
                  if (stmt.argument) {
                      result = 'return ' + generateExpression(stmt.argument, {
                          precedence: Precedence.Sequence,
                          allowIn: true
                      }) + ';';
                  } else {
                      result = 'return;';
                  }
                  break;

              case Syntax.WhileStatement:
                  previousBase = base;
                  base += indent;
                  result = 'while (' + generateExpression(stmt.test, {
                      precedence: Precedence.Sequence,
                      allowIn: true
                  }) + ')';
                  base = previousBase;
                  result += maybeBlock(stmt.body);
                  break;

              case Syntax.WithStatement:
                  previousBase = base;
                  base += indent;
                  result = 'with (' + generateExpression(stmt.object, {
                      precedence: Precedence.Sequence,
                      allowIn: true
                  }) + ')';
                  base = previousBase;
                  result += maybeBlock(stmt.body);
                  break;

              default:
                  break;
              }

              if (result === undefined) {
                  throw new Error('Unknown statement type: ' + stmt.type);
              }

              // Attach comments

              if (extra.comment) {
                  if (stmt.leadingComments) {
                      save = result;

                      comment = stmt.leadingComments[0];
                      result = generateComment(comment);
                      if (!endsWithLineTerminator(result)) {
                          result += '\n';
                      }

                      for (i = 1, len = stmt.leadingComments.length; i < len; i += 1) {
                          comment = stmt.leadingComments[i];
                          ret = generateComment(comment);
                          if (!endsWithLineTerminator(ret)) {
                              ret += '\n';
                          }
                          result += addIndent(ret);
                      }

                      result += addIndent(save);
                  }

                  if (stmt.trailingComments) {
                      for (i = 0, len = stmt.trailingComments.length; i < len; i += 1) {
                          comment = stmt.trailingComments[i];
                          if (!endsWithLineTerminator(result)) {
                              result += '\n';
                          }
                          result += addIndent(generateComment(comment));
                      }
                  }
              }

              return result;
          }

          function generate(node, options) {
              var defaultOptions = getDefaultOptions();

              if (typeof options !== 'undefined') {
                  // Obsolete options
                  //
                  //   `options.indent`
                  //   `options.base`
                  //
                  // Instead of them, we can use `option.format.indent`.
                  if (typeof options.indent === 'string') {
                      defaultOptions.format.indent.style = options.indent;
                  }

                  options = updateDeeply(defaultOptions, options);
                  indent = options.format.indent.style;
                  if (typeof options.base === 'string') {
                      base = options.base;
                  } else {
                      base = stringRepeat(indent, options.format.indent.base);
                  }
                  parse = options.parse;
              } else {
                  options = defaultOptions;
                  indent = options.format.indent.style;
                  base = stringRepeat(indent, options.format.indent.base);
                  parse = options.parse;
              }
              extra = options;

              switch (node.type) {
              case Syntax.BlockStatement:
              case Syntax.BreakStatement:
              case Syntax.CatchClause:
              case Syntax.ContinueStatement:
              case Syntax.DoWhileStatement:
              case Syntax.DebuggerStatement:
              case Syntax.EmptyStatement:
              case Syntax.ExpressionStatement:
              case Syntax.ForStatement:
              case Syntax.ForInStatement:
              case Syntax.FunctionDeclaration:
              case Syntax.IfStatement:
              case Syntax.LabeledStatement:
              case Syntax.Program:
              case Syntax.ReturnStatement:
              case Syntax.SwitchStatement:
              case Syntax.SwitchCase:
              case Syntax.ThrowStatement:
              case Syntax.TryStatement:
              case Syntax.VariableDeclaration:
              case Syntax.VariableDeclarator:
              case Syntax.WhileStatement:
              case Syntax.WithStatement:
                  return generateStatement(node);

              case Syntax.AssignmentExpression:
              case Syntax.ArrayExpression:
              case Syntax.BinaryExpression:
              case Syntax.CallExpression:
              case Syntax.ConditionalExpression:
              case Syntax.FunctionExpression:
              case Syntax.Identifier:
              case Syntax.Literal:
              case Syntax.LogicalExpression:
              case Syntax.MemberExpression:
              case Syntax.NewExpression:
              case Syntax.ObjectExpression:
              case Syntax.Property:
              case Syntax.SequenceExpression:
              case Syntax.ThisExpression:
              case Syntax.UnaryExpression:
              case Syntax.UpdateExpression:
                  return generateExpression(node, {
                      precedence: Precedence.Sequence,
                      allowIn: true
                  });

              default:
                  break;
              }
              throw new Error('Unknown node type: ' + node.type);
          }

          // simple visitor implementation

          VisitorKeys = {
              AssignmentExpression: ['left', 'right'],
              ArrayExpression: ['elements'],
              BlockStatement: ['body'],
              BinaryExpression: ['left', 'right'],
              BreakStatement: ['label'],
              CallExpression: ['callee', 'arguments'],
              CatchClause: ['param', 'body'],
              ConditionalExpression: ['test', 'consequent', 'alternate'],
              ContinueStatement: ['label'],
              DoWhileStatement: ['body', 'test'],
              DebuggerStatement: [],
              EmptyStatement: [],
              ExpressionStatement: ['expression'],
              ForStatement: ['init', 'test', 'update', 'body'],
              ForInStatement: ['left', 'right', 'body'],
              FunctionDeclaration: ['id', 'params', 'body'],
              FunctionExpression: ['id', 'params', 'body'],
              Identifier: [],
              IfStatement: ['test', 'consequent', 'alternate'],
              Literal: [],
              LabeledStatement: ['label', 'body'],
              LogicalExpression: ['left', 'right'],
              MemberExpression: ['object', 'property'],
              NewExpression: ['callee', 'arguments'],
              ObjectExpression: ['properties'],
              Program: ['body'],
              Property: ['key', 'value'],
              ReturnStatement: ['argument'],
              SequenceExpression: ['expressions'],
              SwitchStatement: ['descriminant', 'cases'],
              SwitchCase: ['test', 'consequent'],
              ThisExpression: [],
              ThrowStatement: ['argument'],
              TryStatement: ['block', 'handlers', 'finalizer'],
              UnaryExpression: ['argument'],
              UpdateExpression: ['argument'],
              VariableDeclaration: ['declarations'],
              VariableDeclarator: ['id', 'init'],
              WhileStatement: ['test', 'body'],
              WithStatement: ['object', 'body']
          };

          VisitorOption = {
              Break: 1,
              Skip: 2
          };

          function traverse(top, visitor) {
              var worklist, leavelist, node, ret, current, current2, candidates, candidate;

              worklist = [ top ];
              leavelist = [];

              while (worklist.length) {
                  node = worklist.pop();

                  if (node) {
                      if (visitor.enter) {
                          ret = visitor.enter(node);
                      } else {
                          ret = undefined;
                      }

                      if (ret === VisitorOption.Break) {
                          return;
                      }

                      worklist.push(null);
                      leavelist.push(node);

                      if (ret !== VisitorOption.Skip) {
                          candidates = VisitorKeys[node.type];
                          current = candidates.length;
                          while ((current -= 1) >= 0) {
                              candidate = node[candidates[current]];
                              if (candidate) {
                                  if (isArray(candidate)) {
                                      current2 = candidate.length;
                                      while ((current2 -= 1) >= 0) {
                                          if (candidate[current2]) {
                                              worklist.push(candidate[current2]);
                                          }
                                      }
                                  } else {
                                      worklist.push(candidate);
                                  }
                              }
                          }
                      }
                  } else {
                      node = leavelist.pop();
                      if (visitor.leave) {
                          ret = visitor.leave(node);
                      } else {
                          ret = undefined;
                      }
                      if (ret === VisitorOption.Break) {
                          return;
                      }
                  }
              }
          }

          // based on LLVM libc++ upper_bound / lower_bound
          // MIT License

          function upperBound(array, func) {
              var diff, len, i, current;

              len = array.length;
              i = 0;

              while (len) {
                  diff = len >>> 1;
                  current = i + diff;
                  if (func(array[current])) {
                      len = diff;
                  } else {
                      i = current + 1;
                      len -= diff + 1;
                  }
              }
              return i;
          }

          function lowerBound(array, func) {
              var diff, len, i, current;

              len = array.length;
              i = 0;

              while (len) {
                  diff = len >>> 1;
                  current = i + diff;
                  if (func(array[current])) {
                      i = current + 1;
                      len -= diff + 1;
                  } else {
                      len = diff;
                  }
              }
              return i;
          }

          function extendCommentRange(comment, tokens) {
              var target, token;

              target = upperBound(tokens, function search(token) {
                  return token.range[0] > comment.range[0];
              });

              comment.extendedRange = [comment.range[0], comment.range[1]];

              if (target !== tokens.length) {
                  comment.extendedRange[1] = tokens[target].range[0];
              }

              target -= 1;
              if (target >= 0) {
                  if (target < tokens.length) {
                      comment.extendedRange[0] = tokens[target].range[1];
                  } else if (token.length) {
                      comment.extendedRange[1] = tokens[tokens.length - 1].range[0];
                  }
              }

              return comment;
          }

          function attachComments(tree, providedComments, tokens) {
              // At first, we should calculate extended comment ranges.
              var comments = [], len, i;

              if (!tree.range) {
                  throw new Error('attachComments needs range information');
              }

              for (i = 0, len = providedComments.length; i < len; i += 1) {
                  comments.push(extendCommentRange(deepCopy(providedComments[i]), tokens));
              }

              // This is based on John Freeman's implementation.
              traverse(tree, {
                  cursor: 0,
                  enter: function (node) {
                      var comment, len = comments.length;

                      while (this.cursor < len) {
                          comment = comments[this.cursor];
                          if (comment.extendedRange[1] > node.range[0]) {
                              break;
                          }

                          if (comment.extendedRange[1] === node.range[0]) {
                              if (!node.leadingComments) {
                                  node.leadingComments = [];
                              }
                              node.leadingComments.push(comment);
                              comment.ownedType = 'LeadingComment';
                          }
                          this.cursor += 1;
                      }

                      // already out of owned node
                      if (this.cursor === comments.length) {
                          return VisitorOption.Break;
                      }

                      if (comments[this.cursor].extendedRange[0] > node.range[1]) {
                          return VisitorOption.Skip;
                      }
                  }
              });

              traverse(tree, {
                  cursor: 0,
                  leave: function (node) {
                      var comment, len = comments.length;

                      while (this.cursor < len) {
                          comment = comments[this.cursor];
                          if (node.range[1] < comment.extendedRange[0]) {
                              break;
                          }

                          if (node.range[1] === comment.extendedRange[0] && !comment.ownedType) {
                              if (!node.trailingComments) {
                                  node.trailingComments = [];
                              }
                              node.trailingComments.push(comment);
                              comment.ownedType = 'TrailingComment';
                          }
                          this.cursor += 1;
                      }

                      // already out of owned node
                      if (this.cursor === comments.length) {
                          return VisitorOption.Break;
                      }
                  }
              });

              return tree;
          }

          // Sync with package.json.
          exports.version = '0.0.4-dev';

          exports.generate = generate;
          exports.traverse = traverse;
          exports.attachComments = attachComments;

      }(typeof exports === 'undefined' ? (escodegen = {}) : exports));
      /* vim: set sw=4 ts=4 et tw=80 : */

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