parser.js

module.exports = (function(){
  /*
   * Generated by PEG.js 0.7.0.
   *
   * http://pegjs.majda.cz/
   */
  
  function quote(s) {
    /*
     * ECMA-262, 5th ed., 7.8.4: All characters may appear literally in a
     * string literal except for the closing quote character, backslash,
     * carriage return, line separator, paragraph separator, and line feed.
     * Any character may appear in the form of an escape sequence.
     *
     * For portability, we also escape escape all control and non-ASCII
     * characters. Note that "\0" and "\v" escape sequences are not used
     * because JSHint does not like the first and IE the second.
     */
     return '"' + s
      .replace(/\\/g, '\\\\')  // backslash
      .replace(/"/g, '\\"')    // closing quote character
      .replace(/\x08/g, '\\b') // backspace
      .replace(/\t/g, '\\t')   // horizontal tab
      .replace(/\n/g, '\\n')   // line feed
      .replace(/\f/g, '\\f')   // form feed
      .replace(/\r/g, '\\r')   // carriage return
      .replace(/[\x00-\x07\x0B\x0E-\x1F\x80-\uFFFF]/g, escape)
      + '"';
  }
  
  var result = {
    /*
     * Parses the input with a generated parser. If the parsing is successfull,
     * returns a value explicitly or implicitly specified by the grammar from
     * which the parser was generated (see |PEG.buildParser|). If the parsing is
     * unsuccessful, throws |PEG.parser.SyntaxError| describing the error.
     */
    parse: function(input, startRule) {
      var parseFunctions = {
        "start": parse_start,
        "Declaration": parse_Declaration,
        "Revocation": parse_Revocation,
        "VerbQuestion": parse_VerbQuestion,
        "RoleQuestion": parse_RoleQuestion,
        "VerbRequest": parse_VerbRequest,
        "RoleRequest": parse_RoleRequest,
        "VerbSubjectRequest": parse_VerbSubjectRequest,
        "RoleSubjectRequest": parse_RoleSubjectRequest,
        "ObjectVerbRequest": parse_ObjectVerbRequest,
        "ObjectRoleRequest": parse_ObjectRoleRequest,
        "ObjectRoleMapRequest": parse_ObjectRoleMapRequest,
        "SubjectRoleMapRequest": parse_SubjectRoleMapRequest,
        "Token": parse_Token,
        "NamedToken": parse_NamedToken,
        "UnnamedToken": parse_UnnamedToken,
        "Literal": parse_Literal,
        "DoubleQuotedLiteral": parse_DoubleQuotedLiteral,
        "SingleQuotedLiteral": parse_SingleQuotedLiteral,
        "UnquotedLiteral": parse_UnquotedLiteral,
        "Obj": parse_Obj,
        "Positive": parse_Positive,
        "Quantifier": parse_Quantifier,
        "Negative": parse_Negative,
        "Preposition": parse_Preposition,
        "Evaluative": parse_Evaluative
      };
      
      if (startRule !== undefined) {
        if (parseFunctions[startRule] === undefined) {
          throw new Error("Invalid rule name: " + quote(startRule) + ".");
        }
      } else {
        startRule = "start";
      }
      
      var pos = 0;
      var reportFailures = 0;
      var rightmostFailuresPos = 0;
      var rightmostFailuresExpected = [];
      
      function padLeft(input, padding, length) {
        var result = input;
        
        var padLength = length - input.length;
        for (var i = 0; i < padLength; i++) {
          result = padding + result;
        }
        
        return result;
      }
      
      function escape(ch) {
        var charCode = ch.charCodeAt(0);
        var escapeChar;
        var length;
        
        if (charCode <= 0xFF) {
          escapeChar = 'x';
          length = 2;
        } else {
          escapeChar = 'u';
          length = 4;
        }
        
        return '\\' + escapeChar + padLeft(charCode.toString(16).toUpperCase(), '0', length);
      }
      
      function matchFailed(failure) {
        if (pos < rightmostFailuresPos) {
          return;
        }
        
        if (pos > rightmostFailuresPos) {
          rightmostFailuresPos = pos;
          rightmostFailuresExpected = [];
        }
        
        rightmostFailuresExpected.push(failure);
      }

      function parse_start() {
        var result0;
        var pos0;

        pos0 = pos;
        result0 = parse_ObjectRoleMapRequest();
        if (result0 === null) {
          result0 = parse_SubjectRoleMapRequest();
          if (result0 === null) {
            result0 = parse_ObjectRoleRequest();
            if (result0 === null) {
              result0 = parse_ObjectVerbRequest();
              if (result0 === null) {
                result0 = parse_RoleSubjectRequest();
                if (result0 === null) {
                  result0 = parse_VerbSubjectRequest();
                  if (result0 === null) {
                    result0 = parse_RoleQuestion();
                    if (result0 === null) {
                      result0 = parse_RoleRequest();
                      if (result0 === null) {
                        result0 = parse_Declaration();
                        if (result0 === null) {
                          result0 = parse_Revocation();
                          if (result0 === null) {
                            result0 = parse_VerbRequest();
                            if (result0 === null) {
                              result0 = parse_VerbQuestion();
                            }
                          }
                        }
                      }
                    }
                  }
                }
              }
            }
          }
        }
        if (result0 !== null) {
          result0 = (function(offset, ret) {
            if (!ret.object) delete ret.object
            return ret
          })(pos0, result0);
        }
        if (result0 === null) {
          pos = pos0;
        }
        return result0;
      }
      
      function parse_Declaration() {
        var result0, result1, result2, result3, result4, result5, result6, result7, result8;
        var pos0, pos1;
        
        reportFailures++;
        pos0 = pos;
        pos1 = pos;
        result0 = parse_Token();
        if (result0 !== null) {
          if (input.charCodeAt(pos) === 32) {
            result1 = " ";
            pos++;
          } else {
            result1 = null;
            if (reportFailures === 0) {
              matchFailed("\" \"");
            }
          }
          if (result1 !== null) {
            result2 = parse_Negative();
            if (result2 === null) {
              result2 = parse_Positive();
            }
            if (result2 !== null) {
              result3 = parse_Quantifier();
              result3 = result3 !== null ? result3 : "";
              if (result3 !== null) {
                if (input.charCodeAt(pos) === 32) {
                  result4 = " ";
                  pos++;
                } else {
                  result4 = null;
                  if (reportFailures === 0) {
                    matchFailed("\" \"");
                  }
                }
                if (result4 !== null) {
                  result5 = parse_Token();
                  if (result5 !== null) {
                    result6 = parse_Preposition();
                    result6 = result6 !== null ? result6 : "";
                    if (result6 !== null) {
                      result7 = parse_Obj();
                      result7 = result7 !== null ? result7 : "";
                      if (result7 !== null) {
                        if (input.charCodeAt(pos) === 46) {
                          result8 = ".";
                          pos++;
                        } else {
                          result8 = null;
                          if (reportFailures === 0) {
                            matchFailed("\".\"");
                          }
                        }
                        result8 = result8 !== null ? result8 : "";
                        if (result8 !== null) {
                          result0 = [result0, result1, result2, result3, result4, result5, result6, result7, result8];
                        } else {
                          result0 = null;
                          pos = pos1;
                        }
                      } else {
                        result0 = null;
                        pos = pos1;
                      }
                    } else {
                      result0 = null;
                      pos = pos1;
                    }
                  } else {
                    result0 = null;
                    pos = pos1;
                  }
                } else {
                  result0 = null;
                  pos = pos1;
                }
              } else {
                result0 = null;
                pos = pos1;
              }
            } else {
              result0 = null;
              pos = pos1;
            }
          } else {
            result0 = null;
            pos = pos1;
          }
        } else {
          result0 = null;
          pos = pos1;
        }
        if (result0 !== null) {
          result0 = (function(offset, subject, pos, role, object) {
            return {
              type: pos ? "declaration" : "revocation",
              subject: subject,
              role: role,
              object: object
            }
          })(pos0, result0[0], result0[2], result0[5], result0[7]);
        }
        if (result0 === null) {
          pos = pos0;
        }
        reportFailures--;
        if (reportFailures === 0 && result0 === null) {
          matchFailed("declaration");
        }
        return result0;
      }
      
      function parse_Revocation() {
        var result0, result1, result2, result3, result4, result5, result6, result7;
        var pos0, pos1;
        
        reportFailures++;
        pos0 = pos;
        pos1 = pos;
        result0 = parse_Token();
        if (result0 !== null) {
          if (input.charCodeAt(pos) === 32) {
            result1 = " ";
            pos++;
          } else {
            result1 = null;
            if (reportFailures === 0) {
              matchFailed("\" \"");
            }
          }
          if (result1 !== null) {
            result2 = parse_Negative();
            if (result2 !== null) {
              if (input.charCodeAt(pos) === 32) {
                result3 = " ";
                pos++;
              } else {
                result3 = null;
                if (reportFailures === 0) {
                  matchFailed("\" \"");
                }
              }
              if (result3 !== null) {
                result4 = parse_Token();
                if (result4 !== null) {
                  result5 = parse_Preposition();
                  result5 = result5 !== null ? result5 : "";
                  if (result5 !== null) {
                    result6 = parse_Obj();
                    result6 = result6 !== null ? result6 : "";
                    if (result6 !== null) {
                      if (input.charCodeAt(pos) === 46) {
                        result7 = ".";
                        pos++;
                      } else {
                        result7 = null;
                        if (reportFailures === 0) {
                          matchFailed("\".\"");
                        }
                      }
                      result7 = result7 !== null ? result7 : "";
                      if (result7 !== null) {
                        result0 = [result0, result1, result2, result3, result4, result5, result6, result7];
                      } else {
                        result0 = null;
                        pos = pos1;
                      }
                    } else {
                      result0 = null;
                      pos = pos1;
                    }
                  } else {
                    result0 = null;
                    pos = pos1;
                  }
                } else {
                  result0 = null;
                  pos = pos1;
                }
              } else {
                result0 = null;
                pos = pos1;
              }
            } else {
              result0 = null;
              pos = pos1;
            }
          } else {
            result0 = null;
            pos = pos1;
          }
        } else {
          result0 = null;
          pos = pos1;
        }
        if (result0 !== null) {
          result0 = (function(offset, subject, role, object) {
            return {
              type: "revocation",
              subject: subject,
              role: role,
              object: object
            }
          })(pos0, result0[0], result0[4], result0[6]);
        }
        if (result0 === null) {
          pos = pos0;
        }
        reportFailures--;
        if (reportFailures === 0 && result0 === null) {
          matchFailed("revocation");
        }
        return result0;
      }
      
      function parse_VerbQuestion() {
        var result0, result1, result2, result3, result4, result5, result6;
        var pos0, pos1;
        
        reportFailures++;
        pos0 = pos;
        pos1 = pos;
        if (input.substr(pos, 4).toLowerCase() === "can ") {
          result0 = input.substr(pos, 4);
          pos += 4;
        } else {
          result0 = null;
          if (reportFailures === 0) {
            matchFailed("\"can \"");
          }
        }
        if (result0 !== null) {
          result1 = parse_Token();
          if (result1 !== null) {
            if (input.charCodeAt(pos) === 32) {
              result2 = " ";
              pos++;
            } else {
              result2 = null;
              if (reportFailures === 0) {
                matchFailed("\" \"");
              }
            }
            if (result2 !== null) {
              result3 = parse_Token();
              if (result3 !== null) {
                result4 = parse_Preposition();
                result4 = result4 !== null ? result4 : "";
                if (result4 !== null) {
                  result5 = parse_Obj();
                  result5 = result5 !== null ? result5 : "";
                  if (result5 !== null) {
                    if (input.charCodeAt(pos) === 63) {
                      result6 = "?";
                      pos++;
                    } else {
                      result6 = null;
                      if (reportFailures === 0) {
                        matchFailed("\"?\"");
                      }
                    }
                    result6 = result6 !== null ? result6 : "";
                    if (result6 !== null) {
                      result0 = [result0, result1, result2, result3, result4, result5, result6];
                    } else {
                      result0 = null;
                      pos = pos1;
                    }
                  } else {
                    result0 = null;
                    pos = pos1;
                  }
                } else {
                  result0 = null;
                  pos = pos1;
                }
              } else {
                result0 = null;
                pos = pos1;
              }
            } else {
              result0 = null;
              pos = pos1;
            }
          } else {
            result0 = null;
            pos = pos1;
          }
        } else {
          result0 = null;
          pos = pos1;
        }
        if (result0 !== null) {
          result0 = (function(offset, subject, verb, object) {
            return {
              type: "verb-question",
              subject: subject,
              verb: verb,
              object: object
            }
          })(pos0, result0[1], result0[3], result0[5]);
        }
        if (result0 === null) {
          pos = pos0;
        }
        reportFailures--;
        if (reportFailures === 0 && result0 === null) {
          matchFailed("verb question");
        }
        return result0;
      }
      
      function parse_RoleQuestion() {
        var result0, result1, result2, result3, result4, result5, result6, result7, result8;
        var pos0, pos1;
        
        reportFailures++;
        pos0 = pos;
        pos1 = pos;
        result0 = parse_Positive();
        if (result0 !== null) {
          if (input.charCodeAt(pos) === 32) {
            result1 = " ";
            pos++;
          } else {
            result1 = null;
            if (reportFailures === 0) {
              matchFailed("\" \"");
            }
          }
          if (result1 !== null) {
            result2 = parse_Token();
            if (result2 !== null) {
              result3 = parse_Quantifier();
              result3 = result3 !== null ? result3 : "";
              if (result3 !== null) {
                if (input.charCodeAt(pos) === 32) {
                  result4 = " ";
                  pos++;
                } else {
                  result4 = null;
                  if (reportFailures === 0) {
                    matchFailed("\" \"");
                  }
                }
                if (result4 !== null) {
                  result5 = parse_Token();
                  if (result5 !== null) {
                    result6 = parse_Preposition();
                    result6 = result6 !== null ? result6 : "";
                    if (result6 !== null) {
                      result7 = parse_Obj();
                      result7 = result7 !== null ? result7 : "";
                      if (result7 !== null) {
                        if (input.charCodeAt(pos) === 63) {
                          result8 = "?";
                          pos++;
                        } else {
                          result8 = null;
                          if (reportFailures === 0) {
                            matchFailed("\"?\"");
                          }
                        }
                        result8 = result8 !== null ? result8 : "";
                        if (result8 !== null) {
                          result0 = [result0, result1, result2, result3, result4, result5, result6, result7, result8];
                        } else {
                          result0 = null;
                          pos = pos1;
                        }
                      } else {
                        result0 = null;
                        pos = pos1;
                      }
                    } else {
                      result0 = null;
                      pos = pos1;
                    }
                  } else {
                    result0 = null;
                    pos = pos1;
                  }
                } else {
                  result0 = null;
                  pos = pos1;
                }
              } else {
                result0 = null;
                pos = pos1;
              }
            } else {
              result0 = null;
              pos = pos1;
            }
          } else {
            result0 = null;
            pos = pos1;
          }
        } else {
          result0 = null;
          pos = pos1;
        }
        if (result0 !== null) {
          result0 = (function(offset, subject, role, object) {
            return {
              type: "role-question",
              subject: subject,
              role: role,
              object: object
            }
          })(pos0, result0[2], result0[5], result0[7]);
        }
        if (result0 === null) {
          pos = pos0;
        }
        reportFailures--;
        if (reportFailures === 0 && result0 === null) {
          matchFailed("role question");
        }
        return result0;
      }
      
      function parse_VerbRequest() {
        var result0, result1, result2, result3, result4, result5;
        var pos0, pos1;
        
        reportFailures++;
        pos0 = pos;
        pos1 = pos;
        if (input.substr(pos, 9).toLowerCase() === "what can ") {
          result0 = input.substr(pos, 9);
          pos += 9;
        } else {
          result0 = null;
          if (reportFailures === 0) {
            matchFailed("\"what can \"");
          }
        }
        if (result0 !== null) {
          result1 = parse_Token();
          if (result1 !== null) {
            if (input.charCodeAt(pos) === 32) {
              result2 = " ";
              pos++;
            } else {
              result2 = null;
              if (reportFailures === 0) {
                matchFailed("\" \"");
              }
            }
            if (result2 !== null) {
              result3 = parse_Token();
              if (result3 !== null) {
                result4 = parse_Preposition();
                result4 = result4 !== null ? result4 : "";
                if (result4 !== null) {
                  if (input.charCodeAt(pos) === 63) {
                    result5 = "?";
                    pos++;
                  } else {
                    result5 = null;
                    if (reportFailures === 0) {
                      matchFailed("\"?\"");
                    }
                  }
                  result5 = result5 !== null ? result5 : "";
                  if (result5 !== null) {
                    result0 = [result0, result1, result2, result3, result4, result5];
                  } else {
                    result0 = null;
                    pos = pos1;
                  }
                } else {
                  result0 = null;
                  pos = pos1;
                }
              } else {
                result0 = null;
                pos = pos1;
              }
            } else {
              result0 = null;
              pos = pos1;
            }
          } else {
            result0 = null;
            pos = pos1;
          }
        } else {
          result0 = null;
          pos = pos1;
        }
        if (result0 !== null) {
          result0 = (function(offset, subject, verb) {
            return {
              type: "verb-request",
              subject: subject,
              verb: verb
            }
          })(pos0, result0[1], result0[3]);
        }
        if (result0 === null) {
          pos = pos0;
        }
        reportFailures--;
        if (reportFailures === 0 && result0 === null) {
          matchFailed("verb request");
        }
        return result0;
      }
      
      function parse_RoleRequest() {
        var result0, result1, result2, result3, result4, result5, result6, result7, result8;
        var pos0, pos1;
        
        reportFailures++;
        pos0 = pos;
        pos1 = pos;
        if (input.substr(pos, 5).toLowerCase() === "what ") {
          result0 = input.substr(pos, 5);
          pos += 5;
        } else {
          result0 = null;
          if (reportFailures === 0) {
            matchFailed("\"what \"");
          }
        }
        if (result0 !== null) {
          result1 = parse_Positive();
          if (result1 !== null) {
            if (input.charCodeAt(pos) === 32) {
              result2 = " ";
              pos++;
            } else {
              result2 = null;
              if (reportFailures === 0) {
                matchFailed("\" \"");
              }
            }
            if (result2 !== null) {
              result3 = parse_Token();
              if (result3 !== null) {
                result4 = parse_Quantifier();
                result4 = result4 !== null ? result4 : "";
                if (result4 !== null) {
                  if (input.charCodeAt(pos) === 32) {
                    result5 = " ";
                    pos++;
                  } else {
                    result5 = null;
                    if (reportFailures === 0) {
                      matchFailed("\" \"");
                    }
                  }
                  if (result5 !== null) {
                    result6 = parse_Token();
                    if (result6 !== null) {
                      result7 = parse_Preposition();
                      result7 = result7 !== null ? result7 : "";
                      if (result7 !== null) {
                        if (input.charCodeAt(pos) === 63) {
                          result8 = "?";
                          pos++;
                        } else {
                          result8 = null;
                          if (reportFailures === 0) {
                            matchFailed("\"?\"");
                          }
                        }
                        result8 = result8 !== null ? result8 : "";
                        if (result8 !== null) {
                          result0 = [result0, result1, result2, result3, result4, result5, result6, result7, result8];
                        } else {
                          result0 = null;
                          pos = pos1;
                        }
                      } else {
                        result0 = null;
                        pos = pos1;
                      }
                    } else {
                      result0 = null;
                      pos = pos1;
                    }
                  } else {
                    result0 = null;
                    pos = pos1;
                  }
                } else {
                  result0 = null;
                  pos = pos1;
                }
              } else {
                result0 = null;
                pos = pos1;
              }
            } else {
              result0 = null;
              pos = pos1;
            }
          } else {
            result0 = null;
            pos = pos1;
          }
        } else {
          result0 = null;
          pos = pos1;
        }
        if (result0 !== null) {
          result0 = (function(offset, subject, role) {
            return {
              type: "role-request",
              subject: subject,
              role: role
            }
          })(pos0, result0[3], result0[6]);
        }
        if (result0 === null) {
          pos = pos0;
        }
        reportFailures--;
        if (reportFailures === 0 && result0 === null) {
          matchFailed("role request");
        }
        return result0;
      }
      
      function parse_VerbSubjectRequest() {
        var result0, result1, result2, result3, result4, result5;
        var pos0, pos1;
        
        reportFailures++;
        pos0 = pos;
        pos1 = pos;
        if (input.substr(pos, 8).toLowerCase() === "who can ") {
          result0 = input.substr(pos, 8);
          pos += 8;
        } else {
          result0 = null;
          if (reportFailures === 0) {
            matchFailed("\"who can \"");
          }
        }
        if (result0 !== null) {
          result1 = parse_Token();
          if (result1 !== null) {
            result2 = parse_Preposition();
            result2 = result2 !== null ? result2 : "";
            if (result2 !== null) {
              if (input.charCodeAt(pos) === 32) {
                result3 = " ";
                pos++;
              } else {
                result3 = null;
                if (reportFailures === 0) {
                  matchFailed("\" \"");
                }
              }
              if (result3 !== null) {
                result4 = parse_Token();
                if (result4 !== null) {
                  if (input.charCodeAt(pos) === 63) {
                    result5 = "?";
                    pos++;
                  } else {
                    result5 = null;
                    if (reportFailures === 0) {
                      matchFailed("\"?\"");
                    }
                  }
                  result5 = result5 !== null ? result5 : "";
                  if (result5 !== null) {
                    result0 = [result0, result1, result2, result3, result4, result5];
                  } else {
                    result0 = null;
                    pos = pos1;
                  }
                } else {
                  result0 = null;
                  pos = pos1;
                }
              } else {
                result0 = null;
                pos = pos1;
              }
            } else {
              result0 = null;
              pos = pos1;
            }
          } else {
            result0 = null;
            pos = pos1;
          }
        } else {
          result0 = null;
          pos = pos1;
        }
        if (result0 !== null) {
          result0 = (function(offset, verb, object) {
            return {
              type: "verb-subject-request",
              object: object,
              verb: verb
            }
          })(pos0, result0[1], result0[4]);
        }
        if (result0 === null) {
          pos = pos0;
        }
        reportFailures--;
        if (reportFailures === 0 && result0 === null) {
          matchFailed("verb subject request");
        }
        return result0;
      }
      
      function parse_RoleSubjectRequest() {
        var result0, result1, result2, result3, result4, result5, result6, result7, result8;
        var pos0, pos1;
        
        reportFailures++;
        pos0 = pos;
        pos1 = pos;
        if (input.substr(pos, 4).toLowerCase() === "who ") {
          result0 = input.substr(pos, 4);
          pos += 4;
        } else {
          result0 = null;
          if (reportFailures === 0) {
            matchFailed("\"who \"");
          }
        }
        if (result0 !== null) {
          result1 = parse_Positive();
          if (result1 !== null) {
            result2 = parse_Quantifier();
            result2 = result2 !== null ? result2 : "";
            if (result2 !== null) {
              if (input.charCodeAt(pos) === 32) {
                result3 = " ";
                pos++;
              } else {
                result3 = null;
                if (reportFailures === 0) {
                  matchFailed("\" \"");
                }
              }
              if (result3 !== null) {
                result4 = parse_Token();
                if (result4 !== null) {
                  result5 = parse_Preposition();
                  result5 = result5 !== null ? result5 : "";
                  if (result5 !== null) {
                    if (input.charCodeAt(pos) === 32) {
                      result6 = " ";
                      pos++;
                    } else {
                      result6 = null;
                      if (reportFailures === 0) {
                        matchFailed("\" \"");
                      }
                    }
                    if (result6 !== null) {
                      result7 = parse_Token();
                      if (result7 !== null) {
                        if (input.charCodeAt(pos) === 63) {
                          result8 = "?";
                          pos++;
                        } else {
                          result8 = null;
                          if (reportFailures === 0) {
                            matchFailed("\"?\"");
                          }
                        }
                        result8 = result8 !== null ? result8 : "";
                        if (result8 !== null) {
                          result0 = [result0, result1, result2, result3, result4, result5, result6, result7, result8];
                        } else {
                          result0 = null;
                          pos = pos1;
                        }
                      } else {
                        result0 = null;
                        pos = pos1;
                      }
                    } else {
                      result0 = null;
                      pos = pos1;
                    }
                  } else {
                    result0 = null;
                    pos = pos1;
                  }
                } else {
                  result0 = null;
                  pos = pos1;
                }
              } else {
                result0 = null;
                pos = pos1;
              }
            } else {
              result0 = null;
              pos = pos1;
            }
          } else {
            result0 = null;
            pos = pos1;
          }
        } else {
          result0 = null;
          pos = pos1;
        }
        if (result0 !== null) {
          result0 = (function(offset, role, object) {
            return {
              type: "role-subject-request",
              object: object,
              role: role
            }
          })(pos0, result0[4], result0[7]);
        }
        if (result0 === null) {
          pos = pos0;
        }
        reportFailures--;
        if (reportFailures === 0 && result0 === null) {
          matchFailed("role subject request");
        }
        return result0;
      }
      
      function parse_ObjectVerbRequest() {
        var result0, result1, result2, result3, result4, result5, result6;
        var pos0, pos1;
        
        reportFailures++;
        pos0 = pos;
        pos1 = pos;
        if (input.substr(pos, 17).toLowerCase() === "what actions can ") {
          result0 = input.substr(pos, 17);
          pos += 17;
        } else {
          result0 = null;
          if (reportFailures === 0) {
            matchFailed("\"what actions can \"");
          }
        }
        if (result0 !== null) {
          result1 = parse_Token();
          if (result1 !== null) {
            if (input.substr(pos, 3).toLowerCase() === " do") {
              result2 = input.substr(pos, 3);
              pos += 3;
            } else {
              result2 = null;
              if (reportFailures === 0) {
                matchFailed("\" do\"");
              }
            }
            if (result2 !== null) {
              result3 = parse_Preposition();
              if (result3 !== null) {
                if (input.charCodeAt(pos) === 32) {
                  result4 = " ";
                  pos++;
                } else {
                  result4 = null;
                  if (reportFailures === 0) {
                    matchFailed("\" \"");
                  }
                }
                if (result4 !== null) {
                  result5 = parse_Token();
                  if (result5 !== null) {
                    if (input.charCodeAt(pos) === 63) {
                      result6 = "?";
                      pos++;
                    } else {
                      result6 = null;
                      if (reportFailures === 0) {
                        matchFailed("\"?\"");
                      }
                    }
                    result6 = result6 !== null ? result6 : "";
                    if (result6 !== null) {
                      result0 = [result0, result1, result2, result3, result4, result5, result6];
                    } else {
                      result0 = null;
                      pos = pos1;
                    }
                  } else {
                    result0 = null;
                    pos = pos1;
                  }
                } else {
                  result0 = null;
                  pos = pos1;
                }
              } else {
                result0 = null;
                pos = pos1;
              }
            } else {
              result0 = null;
              pos = pos1;
            }
          } else {
            result0 = null;
            pos = pos1;
          }
        } else {
          result0 = null;
          pos = pos1;
        }
        if (result0 !== null) {
          result0 = (function(offset, subject, object) {
            return {
              type: "object-verb-request",
              subject: subject,
              object: object
            }
          })(pos0, result0[1], result0[5]);
        }
        if (result0 === null) {
          pos = pos0;
        }
        reportFailures--;
        if (reportFailures === 0 && result0 === null) {
          matchFailed("object verb request");
        }
        return result0;
      }

      function parse_ObjectRoleRequest() {
        var result0, result1, result2, result3, result4, result5, result6;
        var pos0, pos1;

        reportFailures++;
        pos0 = pos;
        pos1 = pos;
        if (input.substr(pos, 16).toLowerCase() === "what roles does ") {
          result0 = input.substr(pos, 16);
          pos += 16;
        } else {
          result0 = null;
          if (reportFailures === 0) {
            matchFailed("\"what roles does \"");
          }
        }
        if (result0 !== null) {
          result1 = parse_Token();
          if (result1 !== null) {
            if (input.substr(pos, 5).toLowerCase() === " have") {
              result2 = input.substr(pos, 5);
              pos += 5;
            } else {
              result2 = null;
              if (reportFailures === 0) {
                matchFailed("\" have\"");
              }
            }
            if (result2 !== null) {
              result3 = parse_Preposition();
              if (result3 !== null) {
                if (input.charCodeAt(pos) === 32) {
                  result4 = " ";
                  pos++;
                } else {
                  result4 = null;
                  if (reportFailures === 0) {
                    matchFailed("\" \"");
                  }
                }
                if (result4 !== null) {
                  result5 = parse_Token();
                  if (result5 !== null) {
                    if (input.charCodeAt(pos) === 63) {
                      result6 = "?";
                      pos++;
                    } else {
                      result6 = null;
                      if (reportFailures === 0) {
                        matchFailed("\"?\"");
                      }
                    }
                    result6 = result6 !== null ? result6 : "";
                    if (result6 !== null) {
                      result0 = [result0, result1, result2, result3, result4, result5, result6];
                    } else {
                      result0 = null;
                      pos = pos1;
                    }
                  } else {
                    result0 = null;
                    pos = pos1;
                  }
                } else {
                  result0 = null;
                  pos = pos1;
                }
              } else {
                result0 = null;
                pos = pos1;
              }
            } else {
              result0 = null;
              pos = pos1;
            }
          } else {
            result0 = null;
            pos = pos1;
          }
        } else {
          result0 = null;
          pos = pos1;
        }
        if (result0 !== null) {
          result0 = (function(offset, subject, object) {
            return {
              type: "object-role-request",
              subject: subject,
              object: object
            }
          })(pos0, result0[1], result0[5]);
        }
        if (result0 === null) {
          pos = pos0;
        }
        reportFailures--;
        if (reportFailures === 0 && result0 === null) {
          matchFailed("object role request");
        }
        return result0;
      }

      function parse_ObjectRoleMapRequest() {
        var result0, result1, result2, result3, result4;
        var pos0, pos1;

        reportFailures++;
        pos0 = pos;
        pos1 = pos;
        result0 = parse_Evaluative();
        if (result0 !== null) {
          if (input.substr(pos, 6).toLowerCase() === " what ") {
            result1 = input.substr(pos, 6);
            pos += 6;
          } else {
            result1 = null;
            if (reportFailures === 0) {
              matchFailed("\" what \"");
            }
          }
          if (result1 !== null) {
            result2 = parse_Token();
            if (result2 !== null) {
              if (input.substr(pos, 7) === " can do") {
                result3 = " can do";
                pos += 7;
              } else {
                result3 = null;
                if (reportFailures === 0) {
                  matchFailed("\" can do\"");
                }
              }
              if (result3 !== null) {
                if (input.charCodeAt(pos) === 46) {
                  result4 = ".";
                  pos++;
                } else {
                  result4 = null;
                  if (reportFailures === 0) {
                    matchFailed("\".\"");
                  }
                }
                result4 = result4 !== null ? result4 : "";
                if (result4 !== null) {
                  result0 = [result0, result1, result2, result3, result4];
                } else {
                  result0 = null;
                  pos = pos1;
                }
              } else {
                result0 = null;
                pos = pos1;
              }
            } else {
              result0 = null;
              pos = pos1;
            }
          } else {
            result0 = null;
            pos = pos1;
          }
        } else {
          result0 = null;
          pos = pos1;
        }
        if (result0 !== null) {
          result0 = (function(offset, subject) {
            return {
              type: "object-role-map-request",
              subject: subject
            }
          })(pos0, result0[2]);
        }
        if (result0 === null) {
          pos = pos0;
        }
        reportFailures--;
        if (reportFailures === 0 && result0 === null) {
          matchFailed("object role map request");
        }
        return result0;
      }

      function parse_SubjectRoleMapRequest() {
        var result0, result1, result2, result3, result4;
        var pos0, pos1;

        reportFailures++;
        pos0 = pos;
        pos1 = pos;
        result0 = parse_Evaluative();
        if (result0 !== null) {
          if (input.substr(pos, 12).toLowerCase() === " who can act") {
            result1 = input.substr(pos, 12);
            pos += 12;
          } else {
            result1 = null;
            if (reportFailures === 0) {
              matchFailed("\" who can act\"");
            }
          }
          if (result1 !== null) {
            if (input.substr(pos, 3).toLowerCase() === " on") {
              result2 = input.substr(pos, 3);
              pos += 3;
            } else {
              result2 = null;
              if (reportFailures === 0) {
                matchFailed("\" on\"");
              }
            }
            result2 = result2 !== null ? result2 : "";
            if (result2 !== null) {
              result3 = parse_Obj();
              result3 = result3 !== null ? result3 : "";
              if (result3 !== null) {
                if (input.charCodeAt(pos) === 46) {
                  result4 = ".";
                  pos++;
                } else {
                  result4 = null;
                  if (reportFailures === 0) {
                    matchFailed("\".\"");
                  }
                }
                result4 = result4 !== null ? result4 : "";
                if (result4 !== null) {
                  result0 = [result0, result1, result2, result3, result4];
                } else {
                  result0 = null;
                  pos = pos1;
                }
              } else {
                result0 = null;
                pos = pos1;
              }
            } else {
              result0 = null;
              pos = pos1;
            }
          } else {
            result0 = null;
            pos = pos1;
          }
        } else {
          result0 = null;
          pos = pos1;
        }
        if (result0 !== null) {
          result0 = (function(offset, object) {
            return {
              type: "subject-role-map-request",
              object: object
            }
          })(pos0, result0[3]);
        }
        if (result0 === null) {
          pos = pos0;
        }
        reportFailures--;
        if (reportFailures === 0 && result0 === null) {
          matchFailed("subject role map request");
        }
        return result0;
      }

      function parse_Token() {
        var result0;
        
        reportFailures++;
        result0 = parse_NamedToken();
        if (result0 === null) {
          result0 = parse_UnnamedToken();
          if (result0 === null) {
            result0 = parse_Literal();
          }
        }
        reportFailures--;
        if (reportFailures === 0 && result0 === null) {
          matchFailed("token");
        }
        return result0;
      }
      
      function parse_NamedToken() {
        var result0, result1, result2;
        var pos0, pos1;
        
        reportFailures++;
        pos0 = pos;
        pos1 = pos;
        if (input.charCodeAt(pos) === 58) {
          result0 = ":";
          pos++;
        } else {
          result0 = null;
          if (reportFailures === 0) {
            matchFailed("\":\"");
          }
        }
        if (result0 !== null) {
          if (/^[^ ?]/.test(input.charAt(pos))) {
            result2 = input.charAt(pos);
            pos++;
          } else {
            result2 = null;
            if (reportFailures === 0) {
              matchFailed("[^ ?]");
            }
          }
          if (result2 !== null) {
            result1 = [];
            while (result2 !== null) {
              result1.push(result2);
              if (/^[^ ?]/.test(input.charAt(pos))) {
                result2 = input.charAt(pos);
                pos++;
              } else {
                result2 = null;
                if (reportFailures === 0) {
                  matchFailed("[^ ?]");
                }
              }
            }
          } else {
            result1 = null;
          }
          if (result1 !== null) {
            result0 = [result0, result1];
          } else {
            result0 = null;
            pos = pos1;
          }
        } else {
          result0 = null;
          pos = pos1;
        }
        if (result0 !== null) {
          result0 = (function(offset, name) {
            return {
              name: name.join("")
            }
          })(pos0, result0[1]);
        }
        if (result0 === null) {
          pos = pos0;
        }
        reportFailures--;
        if (reportFailures === 0 && result0 === null) {
          matchFailed("named token");
        }
        return result0;
      }
      
      function parse_UnnamedToken() {
        var result0, result1;
        var pos0, pos1;
        
        reportFailures++;
        pos0 = pos;
        pos1 = pos;
        if (input.charCodeAt(pos) === 37) {
          result0 = "%";
          pos++;
        } else {
          result0 = null;
          if (reportFailures === 0) {
            matchFailed("\"%\"");
          }
        }
        if (result0 !== null) {
          if (input.charCodeAt(pos) === 115) {
            result1 = "s";
            pos++;
          } else {
            result1 = null;
            if (reportFailures === 0) {
              matchFailed("\"s\"");
            }
          }
          if (result1 === null) {
            if (input.charCodeAt(pos) === 100) {
              result1 = "d";
              pos++;
            } else {
              result1 = null;
              if (reportFailures === 0) {
                matchFailed("\"d\"");
              }
            }
          }
          if (result1 !== null) {
            result0 = [result0, result1];
          } else {
            result0 = null;
            pos = pos1;
          }
        } else {
          result0 = null;
          pos = pos1;
        }
        if (result0 !== null) {
          result0 = (function(offset, type) {
            return {
              type: type === "d" ? "number" : "string",
              index: tokenIndex++
            }
          })(pos0, result0[1]);
        }
        if (result0 === null) {
          pos = pos0;
        }
        reportFailures--;
        if (reportFailures === 0 && result0 === null) {
          matchFailed("unnamed token");
        }
        return result0;
      }
      
      function parse_Literal() {
        var result0;
        
        reportFailures++;
        result0 = parse_DoubleQuotedLiteral();
        if (result0 === null) {
          result0 = parse_SingleQuotedLiteral();
          if (result0 === null) {
            result0 = parse_UnquotedLiteral();
          }
        }
        reportFailures--;
        if (reportFailures === 0 && result0 === null) {
          matchFailed("literal");
        }
        return result0;
      }
      
      function parse_DoubleQuotedLiteral() {
        var result0, result1, result2;
        var pos0, pos1;
        
        reportFailures++;
        pos0 = pos;
        pos1 = pos;
        if (input.charCodeAt(pos) === 34) {
          result0 = "\"";
          pos++;
        } else {
          result0 = null;
          if (reportFailures === 0) {
            matchFailed("\"\\\"\"");
          }
        }
        if (result0 !== null) {
          if (/^[^"]/.test(input.charAt(pos))) {
            result2 = input.charAt(pos);
            pos++;
          } else {
            result2 = null;
            if (reportFailures === 0) {
              matchFailed("[^\"]");
            }
          }
          if (result2 !== null) {
            result1 = [];
            while (result2 !== null) {
              result1.push(result2);
              if (/^[^"]/.test(input.charAt(pos))) {
                result2 = input.charAt(pos);
                pos++;
              } else {
                result2 = null;
                if (reportFailures === 0) {
                  matchFailed("[^\"]");
                }
              }
            }
          } else {
            result1 = null;
          }
          if (result1 !== null) {
            if (input.charCodeAt(pos) === 34) {
              result2 = "\"";
              pos++;
            } else {
              result2 = null;
              if (reportFailures === 0) {
                matchFailed("\"\\\"\"");
              }
            }
            if (result2 !== null) {
              result0 = [result0, result1, result2];
            } else {
              result0 = null;
              pos = pos1;
            }
          } else {
            result0 = null;
            pos = pos1;
          }
        } else {
          result0 = null;
          pos = pos1;
        }
        if (result0 !== null) {
          result0 = (function(offset, value) {
            return {
              value: value.join("")
            }
          })(pos0, result0[1]);
        }
        if (result0 === null) {
          pos = pos0;
        }
        reportFailures--;
        if (reportFailures === 0 && result0 === null) {
          matchFailed("double-quoted literal");
        }
        return result0;
      }
      
      function parse_SingleQuotedLiteral() {
        var result0, result1, result2;
        var pos0, pos1;
        
        reportFailures++;
        pos0 = pos;
        pos1 = pos;
        if (input.charCodeAt(pos) === 39) {
          result0 = "'";
          pos++;
        } else {
          result0 = null;
          if (reportFailures === 0) {
            matchFailed("\"'\"");
          }
        }
        if (result0 !== null) {
          if (/^[^']/.test(input.charAt(pos))) {
            result2 = input.charAt(pos);
            pos++;
          } else {
            result2 = null;
            if (reportFailures === 0) {
              matchFailed("[^']");
            }
          }
          if (result2 !== null) {
            result1 = [];
            while (result2 !== null) {
              result1.push(result2);
              if (/^[^']/.test(input.charAt(pos))) {
                result2 = input.charAt(pos);
                pos++;
              } else {
                result2 = null;
                if (reportFailures === 0) {
                  matchFailed("[^']");
                }
              }
            }
          } else {
            result1 = null;
          }
          if (result1 !== null) {
            if (input.charCodeAt(pos) === 39) {
              result2 = "'";
              pos++;
            } else {
              result2 = null;
              if (reportFailures === 0) {
                matchFailed("\"'\"");
              }
            }
            if (result2 !== null) {
              result0 = [result0, result1, result2];
            } else {
              result0 = null;
              pos = pos1;
            }
          } else {
            result0 = null;
            pos = pos1;
          }
        } else {
          result0 = null;
          pos = pos1;
        }
        if (result0 !== null) {
          result0 = (function(offset, value) {
            return {
              value: value.join("")
            }
          })(pos0, result0[1]);
        }
        if (result0 === null) {
          pos = pos0;
        }
        reportFailures--;
        if (reportFailures === 0 && result0 === null) {
          matchFailed("single-quoted literal");
        }
        return result0;
      }
      
      function parse_UnquotedLiteral() {
        var result0, result1;
        var pos0;
        
        reportFailures++;
        pos0 = pos;
        if (/^[^ ?]/.test(input.charAt(pos))) {
          result1 = input.charAt(pos);
          pos++;
        } else {
          result1 = null;
          if (reportFailures === 0) {
            matchFailed("[^ ?]");
          }
        }
        if (result1 !== null) {
          result0 = [];
          while (result1 !== null) {
            result0.push(result1);
            if (/^[^ ?]/.test(input.charAt(pos))) {
              result1 = input.charAt(pos);
              pos++;
            } else {
              result1 = null;
              if (reportFailures === 0) {
                matchFailed("[^ ?]");
              }
            }
          }
        } else {
          result0 = null;
        }
        if (result0 !== null) {
          result0 = (function(offset, value) {
            return {
              value: value.join("")
            }
          })(pos0, result0);
        }
        if (result0 === null) {
          pos = pos0;
        }
        reportFailures--;
        if (reportFailures === 0 && result0 === null) {
          matchFailed("unquoted literal");
        }
        return result0;
      }
      
      function parse_Obj() {
        var result0, result1;
        var pos0, pos1;
        
        reportFailures++;
        pos0 = pos;
        pos1 = pos;
        if (input.charCodeAt(pos) === 32) {
          result0 = " ";
          pos++;
        } else {
          result0 = null;
          if (reportFailures === 0) {
            matchFailed("\" \"");
          }
        }
        if (result0 !== null) {
          result1 = parse_Token();
          if (result1 !== null) {
            result0 = [result0, result1];
          } else {
            result0 = null;
            pos = pos1;
          }
        } else {
          result0 = null;
          pos = pos1;
        }
        if (result0 !== null) {
          result0 = (function(offset, value) {
            return value;
          })(pos0, result0[1]);
        }
        if (result0 === null) {
          pos = pos0;
        }
        reportFailures--;
        if (reportFailures === 0 && result0 === null) {
          matchFailed("object");
        }
        return result0;
      }
      
      function parse_Positive() {
        var result0;
        var pos0;
        
        reportFailures++;
        pos0 = pos;
        if (input.substr(pos, 2).toLowerCase() === "is") {
          result0 = input.substr(pos, 2);
          pos += 2;
        } else {
          result0 = null;
          if (reportFailures === 0) {
            matchFailed("\"is\"");
          }
        }
        if (result0 === null) {
          if (input.substr(pos, 3).toLowerCase() === "are") {
            result0 = input.substr(pos, 3);
            pos += 3;
          } else {
            result0 = null;
            if (reportFailures === 0) {
              matchFailed("\"are\"");
            }
          }
          if (result0 === null) {
            if (input.substr(pos, 2).toLowerCase() === "am") {
              result0 = input.substr(pos, 2);
              pos += 2;
            } else {
              result0 = null;
              if (reportFailures === 0) {
                matchFailed("\"am\"");
              }
            }
          }
        }
        if (result0 !== null) {
          result0 = (function(offset) {
            return true
          })(pos0);
        }
        if (result0 === null) {
          pos = pos0;
        }
        reportFailures--;
        if (reportFailures === 0 && result0 === null) {
          matchFailed("positive declaration");
        }
        return result0;
      }
      
      function parse_Quantifier() {
        var result0, result1;
        var pos0;
        
        reportFailures++;
        pos0 = pos;
        if (input.charCodeAt(pos) === 32) {
          result0 = " ";
          pos++;
        } else {
          result0 = null;
          if (reportFailures === 0) {
            matchFailed("\" \"");
          }
        }
        if (result0 !== null) {
          if (input.substr(pos, 2).toLowerCase() === "an") {
            result1 = input.substr(pos, 2);
            pos += 2;
          } else {
            result1 = null;
            if (reportFailures === 0) {
              matchFailed("\"an\"");
            }
          }
          if (result1 === null) {
            if (input.substr(pos, 1).toLowerCase() === "a") {
              result1 = input.substr(pos, 1);
              pos++;
            } else {
              result1 = null;
              if (reportFailures === 0) {
                matchFailed("\"a\"");
              }
            }
            if (result1 === null) {
              if (input.substr(pos, 3).toLowerCase() === "the") {
                result1 = input.substr(pos, 3);
                pos += 3;
              } else {
                result1 = null;
                if (reportFailures === 0) {
                  matchFailed("\"the\"");
                }
              }
            }
          }
          if (result1 !== null) {
            result0 = [result0, result1];
          } else {
            result0 = null;
            pos = pos0;
          }
        } else {
          result0 = null;
          pos = pos0;
        }
        reportFailures--;
        if (reportFailures === 0 && result0 === null) {
          matchFailed("quantifier");
        }
        return result0;
      }
      
      function parse_Negative() {
        var result0, result1;
        var pos0, pos1;
        
        reportFailures++;
        pos0 = pos;
        pos1 = pos;
        if (input.substr(pos, 5).toLowerCase() === "isn't") {
          result0 = input.substr(pos, 5);
          pos += 5;
        } else {
          result0 = null;
          if (reportFailures === 0) {
            matchFailed("\"isn't\"");
          }
        }
        if (result0 === null) {
          if (input.substr(pos, 6).toLowerCase() === "is not") {
            result0 = input.substr(pos, 6);
            pos += 6;
          } else {
            result0 = null;
            if (reportFailures === 0) {
              matchFailed("\"is not\"");
            }
          }
          if (result0 === null) {
            if (input.substr(pos, 7).toLowerCase() === "are not") {
              result0 = input.substr(pos, 7);
              pos += 7;
            } else {
              result0 = null;
              if (reportFailures === 0) {
                matchFailed("\"are not\"");
              }
            }
            if (result0 === null) {
              if (input.substr(pos, 6).toLowerCase() === "am not") {
                result0 = input.substr(pos, 6);
                pos += 6;
              } else {
                result0 = null;
                if (reportFailures === 0) {
                  matchFailed("\"am not\"");
                }
              }
            }
          }
        }
        if (result0 !== null) {
          result1 = parse_Quantifier();
          result1 = result1 !== null ? result1 : "";
          if (result1 !== null) {
            result0 = [result0, result1];
          } else {
            result0 = null;
            pos = pos1;
          }
        } else {
          result0 = null;
          pos = pos1;
        }
        if (result0 !== null) {
          result0 = (function(offset) {
            return false
          })(pos0);
        }
        if (result0 === null) {
          pos = pos0;
        }
        reportFailures--;
        if (reportFailures === 0 && result0 === null) {
          matchFailed("negative declaration");
        }
        return result0;
      }
      
      function parse_Preposition() {
        var result0, result1;
        var pos0;
        
        reportFailures++;
        pos0 = pos;
        if (input.charCodeAt(pos) === 32) {
          result0 = " ";
          pos++;
        } else {
          result0 = null;
          if (reportFailures === 0) {
            matchFailed("\" \"");
          }
        }
        if (result0 !== null) {
          if (input.substr(pos, 2).toLowerCase() === "of") {
            result1 = input.substr(pos, 2);
            pos += 2;
          } else {
            result1 = null;
            if (reportFailures === 0) {
              matchFailed("\"of\"");
            }
          }
          if (result1 === null) {
            if (input.substr(pos, 2).toLowerCase() === "to") {
              result1 = input.substr(pos, 2);
              pos += 2;
            } else {
              result1 = null;
              if (reportFailures === 0) {
                matchFailed("\"to\"");
              }
            }
            if (result1 === null) {
              if (input.substr(pos, 4).toLowerCase() === "from") {
                result1 = input.substr(pos, 4);
                pos += 4;
              } else {
                result1 = null;
                if (reportFailures === 0) {
                  matchFailed("\"from\"");
                }
              }
              if (result1 === null) {
                if (input.substr(pos, 2).toLowerCase() === "in") {
                  result1 = input.substr(pos, 2);
                  pos += 2;
                } else {
                  result1 = null;
                  if (reportFailures === 0) {
                    matchFailed("\"in\"");
                  }
                }
                if (result1 === null) {
                  if (input.substr(pos, 4).toLowerCase() === "with") {
                    result1 = input.substr(pos, 4);
                    pos += 4;
                  } else {
                    result1 = null;
                    if (reportFailures === 0) {
                      matchFailed("\"with\"");
                    }
                  }
                }
              }
            }
          }
          if (result1 !== null) {
            result0 = [result0, result1];
          } else {
            result0 = null;
            pos = pos0;
          }
        } else {
          result0 = null;
          pos = pos0;
        }
        reportFailures--;
        if (reportFailures === 0 && result0 === null) {
          matchFailed("preposition");
        }
        return result0;
      }

      function parse_Evaluative() {
        var result0;

        reportFailures++;
        if (input.substr(pos, 8).toLowerCase() === "describe") {
          result0 = input.substr(pos, 8);
          pos += 8;
        } else {
          result0 = null;
          if (reportFailures === 0) {
            matchFailed("\"describe\"");
          }
        }
        if (result0 === null) {
          if (input.substr(pos, 6).toLowerCase() === "detail") {
            result0 = input.substr(pos, 6);
            pos += 6;
          } else {
            result0 = null;
            if (reportFailures === 0) {
              matchFailed("\"detail\"");
            }
          }
          if (result0 === null) {
            if (input.substr(pos, 7).toLowerCase() === "explain") {
              result0 = input.substr(pos, 7);
              pos += 7;
            } else {
              result0 = null;
              if (reportFailures === 0) {
                matchFailed("\"explain\"");
              }
            }
            if (result0 === null) {
              if (input.substr(pos, 3).toLowerCase() === "get") {
                result0 = input.substr(pos, 3);
                pos += 3;
              } else {
                result0 = null;
                if (reportFailures === 0) {
                  matchFailed("\"get\"");
                }
              }
            }
          }
        }
        reportFailures--;
        if (reportFailures === 0 && result0 === null) {
          matchFailed("evaluative");
        }
        return result0;
      }

      
      function cleanupExpected(expected) {
        expected.sort();
        
        var lastExpected = null;
        var cleanExpected = [];
        for (var i = 0; i < expected.length; i++) {
          if (expected[i] !== lastExpected) {
            cleanExpected.push(expected[i]);
            lastExpected = expected[i];
          }
        }
        return cleanExpected;
      }
      
      function computeErrorPosition() {
        /*
         * The first idea was to use |String.split| to break the input up to the
         * error position along newlines and derive the line and column from
         * there. However IE's |split| implementation is so broken that it was
         * enough to prevent it.
         */
        
        var line = 1;
        var column = 1;
        var seenCR = false;
        
        for (var i = 0; i < Math.max(pos, rightmostFailuresPos); i++) {
          var ch = input.charAt(i);
          if (ch === "\n") {
            if (!seenCR) { line++; }
            column = 1;
            seenCR = false;
          } else if (ch === "\r" || ch === "\u2028" || ch === "\u2029") {
            line++;
            column = 1;
            seenCR = true;
          } else {
            column++;
            seenCR = false;
          }
        }
        
        return { line: line, column: column };
      }
      
      
        var tokenIndex = 0
      
      
      var result = parseFunctions[startRule]();
      
      /*
       * The parser is now in one of the following three states:
       *
       * 1. The parser successfully parsed the whole input.
       *
       *    - |result !== null|
       *    - |pos === input.length|
       *    - |rightmostFailuresExpected| may or may not contain something
       *
       * 2. The parser successfully parsed only a part of the input.
       *
       *    - |result !== null|
       *    - |pos < input.length|
       *    - |rightmostFailuresExpected| may or may not contain something
       *
       * 3. The parser did not successfully parse any part of the input.
       *
       *   - |result === null|
       *   - |pos === 0|
       *   - |rightmostFailuresExpected| contains at least one failure
       *
       * All code following this comment (including called functions) must
       * handle these states.
       */
      if (result === null || pos !== input.length) {
        var offset = Math.max(pos, rightmostFailuresPos);
        var found = offset < input.length ? input.charAt(offset) : null;
        var errorPosition = computeErrorPosition();
        
        throw new this.SyntaxError(
          cleanupExpected(rightmostFailuresExpected),
          found,
          offset,
          errorPosition.line,
          errorPosition.column
        );
      }
      
      return result;
    },
    
    /* Returns the parser source code. */
    toSource: function() { return this._source; }
  };
  
  /* Thrown when a parser encounters a syntax error. */
  
  result.SyntaxError = function(expected, found, offset, line, column) {
    function buildMessage(expected, found) {
      var expectedHumanized, foundHumanized;
      
      switch (expected.length) {
        case 0:
          expectedHumanized = "end of input";
          break;
        case 1:
          expectedHumanized = expected[0];
          break;
        default:
          expectedHumanized = expected.slice(0, expected.length - 1).join(", ")
            + " or "
            + expected[expected.length - 1];
      }
      
      foundHumanized = found ? quote(found) : "end of input";
      
      return "Expected " + expectedHumanized + " but " + foundHumanized + " found.";
    }
    
    this.name = "SyntaxError";
    this.expected = expected;
    this.found = found;
    this.message = buildMessage(expected, found);
    this.offset = offset;
    this.line = line;
    this.column = column;
  };
  
  result.SyntaxError.prototype = Error.prototype;
  
  return result;
})();