// @generated by Peggy 5.1.0.
//
// https://peggyjs.org/


class peg$SyntaxError extends SyntaxError {
  constructor(message, expected, found, location) {
    super(message);
    this.expected = expected;
    this.found = found;
    this.location = location;
    this.name = "SyntaxError";
  }

  format(sources) {
    let str = "Error: " + this.message;
    if (this.location) {
      let src = null;
      const st = sources.find(s => s.source === this.location.source);
      if (st) {
        src = st.text.split(/\r\n|\n|\r/g);
      }
      const s = this.location.start;
      const offset_s = (this.location.source && (typeof this.location.source.offset === "function"))
        ? this.location.source.offset(s)
        : s;
      const loc = this.location.source + ":" + offset_s.line + ":" + offset_s.column;
      if (src) {
        const e = this.location.end;
        const filler = "".padEnd(offset_s.line.toString().length, " ");
        const line = src[s.line - 1];
        const last = s.line === e.line ? e.column : line.length + 1;
        const hatLen = (last - s.column) || 1;
        str += "\n --> " + loc + "\n"
            + filler + " |\n"
            + offset_s.line + " | " + line + "\n"
            + filler + " | " + "".padEnd(s.column - 1, " ")
            + "".padEnd(hatLen, "^");
      } else {
        str += "\n at " + loc;
      }
    }
    return str;
  }

  static buildMessage(expected, found) {
    function hex(ch) {
      return ch.codePointAt(0).toString(16).toUpperCase();
    }

    const nonPrintable = Object.prototype.hasOwnProperty.call(RegExp.prototype, "unicode")
      ? new RegExp("[\\p{C}\\p{Mn}\\p{Mc}]", "gu")
      : null;
    function unicodeEscape(s) {
      if (nonPrintable) {
        return s.replace(nonPrintable,  ch => "\\u{" + hex(ch) + "}");
      }
      return s;
    }

    function literalEscape(s) {
      return unicodeEscape(s
        .replace(/\\/g, "\\\\")
        .replace(/"/g,  "\\\"")
        .replace(/\0/g, "\\0")
        .replace(/\t/g, "\\t")
        .replace(/\n/g, "\\n")
        .replace(/\r/g, "\\r")
        .replace(/[\x00-\x0F]/g,          ch => "\\x0" + hex(ch))
        .replace(/[\x10-\x1F\x7F-\x9F]/g, ch => "\\x"  + hex(ch)));
    }

    function classEscape(s) {
      return unicodeEscape(s
        .replace(/\\/g, "\\\\")
        .replace(/\]/g, "\\]")
        .replace(/\^/g, "\\^")
        .replace(/-/g,  "\\-")
        .replace(/\0/g, "\\0")
        .replace(/\t/g, "\\t")
        .replace(/\n/g, "\\n")
        .replace(/\r/g, "\\r")
        .replace(/[\x00-\x0F]/g,          ch => "\\x0" + hex(ch))
        .replace(/[\x10-\x1F\x7F-\x9F]/g, ch => "\\x"  + hex(ch)));
    }

    const DESCRIBE_EXPECTATION_FNS = {
      literal(expectation) {
        return "\"" + literalEscape(expectation.text) + "\"";
      },

      class(expectation) {
        const escapedParts = expectation.parts.map(
          part => (Array.isArray(part)
            ? classEscape(part[0]) + "-" + classEscape(part[1])
            : classEscape(part))
        );

        return "[" + (expectation.inverted ? "^" : "") + escapedParts.join("") + "]" + (expectation.unicode ? "u" : "");
      },

      any() {
        return "any character";
      },

      end() {
        return "end of input";
      },

      other(expectation) {
        return expectation.description;
      },
    };

    function describeExpectation(expectation) {
      return DESCRIBE_EXPECTATION_FNS[expectation.type](expectation);
    }

    function describeExpected(expected) {
      const descriptions = expected.map(describeExpectation);
      descriptions.sort();

      if (descriptions.length > 0) {
        let j = 1;
        for (let i = 1; i < descriptions.length; i++) {
          if (descriptions[i - 1] !== descriptions[i]) {
            descriptions[j] = descriptions[i];
            j++;
          }
        }
        descriptions.length = j;
      }

      switch (descriptions.length) {
        case 1:
          return descriptions[0];

        case 2:
          return descriptions[0] + " or " + descriptions[1];

        default:
          return descriptions.slice(0, -1).join(", ")
            + ", or "
            + descriptions[descriptions.length - 1];
      }
    }

    function describeFound(found) {
      return found ? "\"" + literalEscape(found) + "\"" : "end of input";
    }

    return "Expected " + describeExpected(expected) + " but " + describeFound(found) + " found.";
  }
}

function peg$parse(input, options) {
  options = options !== undefined ? options : {};

  const peg$FAILED = {};
  const peg$source = options.grammarSource;

  const peg$startRuleFunctions = {
    Expression: peg$parseExpression,
  };
  let peg$startRuleFunction = peg$parseExpression;

  const peg$c0 = "UNLESS";
  const peg$c1 = "FUSION";
  const peg$c2 = "{";
  const peg$c3 = "}";
  const peg$c4 = "max";
  const peg$c5 = "min";
  const peg$c6 = "majority";
  const peg$c7 = "average";
  const peg$c8 = "sum";
  const peg$c9 = "sum_unbounded";
  const peg$c10 = "median";
  const peg$c11 = "optimistic";
  const peg$c12 = "pessimistic";
  const peg$c13 = "top2";
  const peg$c14 = "top3";
  const peg$c15 = "priority";
  const peg$c16 = "*";
  const peg$c17 = "(";
  const peg$c18 = ")";
  const peg$c19 = ",";
  const peg$c20 = ":";
  const peg$c21 = ".";
  const peg$c22 = "::";
  const peg$c23 = "\"";
  const peg$c24 = "'";
  const peg$c25 = "\\";
  const peg$c26 = "//";
  const peg$c27 = "/*";
  const peg$c28 = "*/";

  const peg$r0 = /^[^"\\]/;
  const peg$r1 = /^[^'\\]/;
  const peg$r2 = /^["'\\nrt]/;
  const peg$r3 = /^[0-9]/;
  const peg$r4 = /^[a-zA-Z_]/;
  const peg$r5 = /^[a-zA-Z0-9_\-]/;
  const peg$r6 = /^[ \t\n\r]/;
  const peg$r7 = /^[^\n]/;

  const peg$e0 = peg$literalExpectation("UNLESS", false);
  const peg$e1 = peg$literalExpectation("FUSION", false);
  const peg$e2 = peg$literalExpectation("{", false);
  const peg$e3 = peg$literalExpectation("}", false);
  const peg$e4 = peg$literalExpectation("max", false);
  const peg$e5 = peg$literalExpectation("min", false);
  const peg$e6 = peg$literalExpectation("majority", false);
  const peg$e7 = peg$literalExpectation("average", false);
  const peg$e8 = peg$literalExpectation("sum", false);
  const peg$e9 = peg$literalExpectation("sum_unbounded", false);
  const peg$e10 = peg$literalExpectation("median", false);
  const peg$e11 = peg$literalExpectation("optimistic", false);
  const peg$e12 = peg$literalExpectation("pessimistic", false);
  const peg$e13 = peg$literalExpectation("top2", false);
  const peg$e14 = peg$literalExpectation("top3", false);
  const peg$e15 = peg$literalExpectation("priority", false);
  const peg$e16 = peg$literalExpectation("*", false);
  const peg$e17 = peg$literalExpectation("(", false);
  const peg$e18 = peg$literalExpectation(")", false);
  const peg$e19 = peg$literalExpectation(",", false);
  const peg$e20 = peg$literalExpectation(":", false);
  const peg$e21 = peg$literalExpectation(".", false);
  const peg$e22 = peg$literalExpectation("::", false);
  const peg$e23 = peg$literalExpectation("\"", false);
  const peg$e24 = peg$classExpectation(["\"", "\\"], true, false, false);
  const peg$e25 = peg$literalExpectation("'", false);
  const peg$e26 = peg$classExpectation(["'", "\\"], true, false, false);
  const peg$e27 = peg$literalExpectation("\\", false);
  const peg$e28 = peg$classExpectation(["\"", "'", "\\", "n", "r", "t"], false, false, false);
  const peg$e29 = peg$classExpectation([["0", "9"]], false, false, false);
  const peg$e30 = peg$classExpectation([["a", "z"], ["A", "Z"], "_"], false, false, false);
  const peg$e31 = peg$classExpectation([["a", "z"], ["A", "Z"], ["0", "9"], "_", "-"], false, false, false);
  const peg$e32 = peg$classExpectation([" ", "\t", "\n", "\r"], false, false, false);
  const peg$e33 = peg$literalExpectation("//", false);
  const peg$e34 = peg$classExpectation(["\n"], true, false, false);
  const peg$e35 = peg$literalExpectation("/*", false);
  const peg$e36 = peg$literalExpectation("*/", false);
  const peg$e37 = peg$anyExpectation();

  function peg$f0(expr) {    return expr;  }
  function peg$f1(primary, exception) {
    return makeDefeasible(primary, exception);
  }
  function peg$f2(aggregator, expressions) {
    return makeFusion(expressions, aggregator);
  }
  function peg$f3(head, tail) {
    const exprs = [head];
    for (const t of tail) {
      exprs.push(t[1]);
    }
    return exprs;
  }
  function peg$f4(name, args) {
    return makeChallengePredicate(name, args || []);
  }
  function peg$f5(name, args) {
    return makePredicate(name, args || []);
  }
  function peg$f6(head, tail) {
    const args = [head];
    for (const t of tail) {
      args.push(t[3]);
    }
    return args;
  }
  function peg$f7(name, path) {
    return makeVariable(name, path.map(p => p[1]));
  }
  function peg$f8(refType, path) {
    return { type: 'Reference', refType: refType, path: path };
  }
  function peg$f9(head, tail) {
    const parts = [head];
    for (const t of tail) {
      parts.push(t[1]);
    }
    return parts;
  }
  function peg$f10(chars) {
    return { type: 'Literal', value: chars.join(''), dataType: 'string' };
  }
  function peg$f11(chars) {
    return { type: 'Literal', value: chars.join(''), dataType: 'string' };
  }
  function peg$f12(char) {
    const escapes = { '"': '"', "'": "'", '\\': '\\', 'n': '\n', 'r': '\r', 't': '\t' };
    return escapes[char] || char;
  }
  function peg$f13(digits) {
    return { type: 'Literal', value: parseInt(digits.join(''), 10), dataType: 'number' };
  }
  function peg$f14(first, rest) {
    return first + rest.join('');
  }
  let peg$currPos = options.peg$currPos | 0;
  let peg$savedPos = peg$currPos;
  const peg$posDetailsCache = [{ line: 1, column: 1 }];
  let peg$maxFailPos = peg$currPos;
  let peg$maxFailExpected = options.peg$maxFailExpected || [];
  let peg$silentFails = options.peg$silentFails | 0;

  let peg$result;

  if (options.startRule) {
    if (!(options.startRule in peg$startRuleFunctions)) {
      throw new Error("Can't start parsing from rule \"" + options.startRule + "\".");
    }

    peg$startRuleFunction = peg$startRuleFunctions[options.startRule];
  }

  function text() {
    return input.substring(peg$savedPos, peg$currPos);
  }

  function offset() {
    return peg$savedPos;
  }

  function range() {
    return {
      source: peg$source,
      start: peg$savedPos,
      end: peg$currPos,
    };
  }

  function location() {
    return peg$computeLocation(peg$savedPos, peg$currPos);
  }

  function expected(description, location) {
    location = location !== undefined
      ? location
      : peg$computeLocation(peg$savedPos, peg$currPos);

    throw peg$buildStructuredError(
      [peg$otherExpectation(description)],
      input.substring(peg$savedPos, peg$currPos),
      location
    );
  }

  function error(message, location) {
    location = location !== undefined
      ? location
      : peg$computeLocation(peg$savedPos, peg$currPos);

    throw peg$buildSimpleError(message, location);
  }

  function peg$getUnicode(pos = peg$currPos) {
    const cp = input.codePointAt(pos);
    if (cp === undefined) {
      return "";
    }
    return String.fromCodePoint(cp);
  }

  function peg$literalExpectation(text, ignoreCase) {
    return { type: "literal", text, ignoreCase };
  }

  function peg$classExpectation(parts, inverted, ignoreCase, unicode) {
    return { type: "class", parts, inverted, ignoreCase, unicode };
  }

  function peg$anyExpectation() {
    return { type: "any" };
  }

  function peg$endExpectation() {
    return { type: "end" };
  }

  function peg$otherExpectation(description) {
    return { type: "other", description };
  }

  function peg$computePosDetails(pos) {
    let details = peg$posDetailsCache[pos];
    let p;

    if (details) {
      return details;
    } else {
      if (pos >= peg$posDetailsCache.length) {
        p = peg$posDetailsCache.length - 1;
      } else {
        p = pos;
        while (!peg$posDetailsCache[--p]) {}
      }

      details = peg$posDetailsCache[p];
      details = {
        line: details.line,
        column: details.column,
      };

      while (p < pos) {
        if (input.charCodeAt(p) === 10) {
          details.line++;
          details.column = 1;
        } else {
          details.column++;
        }

        p++;
      }

      peg$posDetailsCache[pos] = details;

      return details;
    }
  }

  function peg$computeLocation(startPos, endPos, offset) {
    const startPosDetails = peg$computePosDetails(startPos);
    const endPosDetails = peg$computePosDetails(endPos);

    const res = {
      source: peg$source,
      start: {
        offset: startPos,
        line: startPosDetails.line,
        column: startPosDetails.column,
      },
      end: {
        offset: endPos,
        line: endPosDetails.line,
        column: endPosDetails.column,
      },
    };
    if (offset && peg$source && (typeof peg$source.offset === "function")) {
      res.start = peg$source.offset(res.start);
      res.end = peg$source.offset(res.end);
    }
    return res;
  }

  function peg$fail(expected) {
    if (peg$currPos < peg$maxFailPos) { return; }

    if (peg$currPos > peg$maxFailPos) {
      peg$maxFailPos = peg$currPos;
      peg$maxFailExpected = [];
    }

    peg$maxFailExpected.push(expected);
  }

  function peg$buildSimpleError(message, location) {
    return new peg$SyntaxError(message, null, null, location);
  }

  function peg$buildStructuredError(expected, found, location) {
    return new peg$SyntaxError(
      peg$SyntaxError.buildMessage(expected, found),
      expected,
      found,
      location
    );
  }

  function peg$parseExpression() {
    let s0, s1, s2, s3;

    s0 = peg$currPos;
    s1 = peg$parse_();
    s2 = peg$parseDefeasibleExpr();
    if (s2 !== peg$FAILED) {
      s3 = peg$parse_();
      peg$savedPos = s0;
      s0 = peg$f0(s2);
    } else {
      peg$currPos = s0;
      s0 = peg$FAILED;
    }

    return s0;
  }

  function peg$parseDefeasibleExpr() {
    let s0, s1, s2, s3, s4, s5;

    s0 = peg$currPos;
    s1 = peg$parsePrimaryExpr();
    if (s1 !== peg$FAILED) {
      s2 = peg$parse_();
      if (input.substr(peg$currPos, 6) === peg$c0) {
        s3 = peg$c0;
        peg$currPos += 6;
      } else {
        s3 = peg$FAILED;
        if (peg$silentFails === 0) { peg$fail(peg$e0); }
      }
      if (s3 !== peg$FAILED) {
        s4 = peg$parse_();
        s5 = peg$parsePredicateCall();
        if (s5 !== peg$FAILED) {
          peg$savedPos = s0;
          s0 = peg$f1(s1, s5);
        } else {
          peg$currPos = s0;
          s0 = peg$FAILED;
        }
      } else {
        peg$currPos = s0;
        s0 = peg$FAILED;
      }
    } else {
      peg$currPos = s0;
      s0 = peg$FAILED;
    }
    if (s0 === peg$FAILED) {
      s0 = peg$parsePrimaryExpr();
    }

    return s0;
  }

  function peg$parsePrimaryExpr() {
    let s0;

    s0 = peg$parseFusionBlock();
    if (s0 === peg$FAILED) {
      s0 = peg$parseChallengePredicate();
      if (s0 === peg$FAILED) {
        s0 = peg$parsePredicateCall();
      }
    }

    return s0;
  }

  function peg$parseFusionBlock() {
    let s0, s1, s2, s3, s4, s5, s6, s7, s8, s9;

    s0 = peg$currPos;
    if (input.substr(peg$currPos, 6) === peg$c1) {
      s1 = peg$c1;
      peg$currPos += 6;
    } else {
      s1 = peg$FAILED;
      if (peg$silentFails === 0) { peg$fail(peg$e1); }
    }
    if (s1 !== peg$FAILED) {
      s2 = peg$parse_();
      s3 = peg$parseAggregatorKeyword();
      if (s3 !== peg$FAILED) {
        s4 = peg$parse_();
        if (input.charCodeAt(peg$currPos) === 123) {
          s5 = peg$c2;
          peg$currPos++;
        } else {
          s5 = peg$FAILED;
          if (peg$silentFails === 0) { peg$fail(peg$e2); }
        }
        if (s5 !== peg$FAILED) {
          s6 = peg$parse_();
          s7 = peg$parseExpressionList();
          if (s7 !== peg$FAILED) {
            s8 = peg$parse_();
            if (input.charCodeAt(peg$currPos) === 125) {
              s9 = peg$c3;
              peg$currPos++;
            } else {
              s9 = peg$FAILED;
              if (peg$silentFails === 0) { peg$fail(peg$e3); }
            }
            if (s9 !== peg$FAILED) {
              peg$savedPos = s0;
              s0 = peg$f2(s3, s7);
            } else {
              peg$currPos = s0;
              s0 = peg$FAILED;
            }
          } else {
            peg$currPos = s0;
            s0 = peg$FAILED;
          }
        } else {
          peg$currPos = s0;
          s0 = peg$FAILED;
        }
      } else {
        peg$currPos = s0;
        s0 = peg$FAILED;
      }
    } else {
      peg$currPos = s0;
      s0 = peg$FAILED;
    }

    return s0;
  }

  function peg$parseAggregatorKeyword() {
    let s0;

    if (input.substr(peg$currPos, 3) === peg$c4) {
      s0 = peg$c4;
      peg$currPos += 3;
    } else {
      s0 = peg$FAILED;
      if (peg$silentFails === 0) { peg$fail(peg$e4); }
    }
    if (s0 === peg$FAILED) {
      if (input.substr(peg$currPos, 3) === peg$c5) {
        s0 = peg$c5;
        peg$currPos += 3;
      } else {
        s0 = peg$FAILED;
        if (peg$silentFails === 0) { peg$fail(peg$e5); }
      }
      if (s0 === peg$FAILED) {
        if (input.substr(peg$currPos, 8) === peg$c6) {
          s0 = peg$c6;
          peg$currPos += 8;
        } else {
          s0 = peg$FAILED;
          if (peg$silentFails === 0) { peg$fail(peg$e6); }
        }
        if (s0 === peg$FAILED) {
          if (input.substr(peg$currPos, 7) === peg$c7) {
            s0 = peg$c7;
            peg$currPos += 7;
          } else {
            s0 = peg$FAILED;
            if (peg$silentFails === 0) { peg$fail(peg$e7); }
          }
          if (s0 === peg$FAILED) {
            if (input.substr(peg$currPos, 3) === peg$c8) {
              s0 = peg$c8;
              peg$currPos += 3;
            } else {
              s0 = peg$FAILED;
              if (peg$silentFails === 0) { peg$fail(peg$e8); }
            }
            if (s0 === peg$FAILED) {
              if (input.substr(peg$currPos, 13) === peg$c9) {
                s0 = peg$c9;
                peg$currPos += 13;
              } else {
                s0 = peg$FAILED;
                if (peg$silentFails === 0) { peg$fail(peg$e9); }
              }
              if (s0 === peg$FAILED) {
                if (input.substr(peg$currPos, 6) === peg$c10) {
                  s0 = peg$c10;
                  peg$currPos += 6;
                } else {
                  s0 = peg$FAILED;
                  if (peg$silentFails === 0) { peg$fail(peg$e10); }
                }
                if (s0 === peg$FAILED) {
                  if (input.substr(peg$currPos, 10) === peg$c11) {
                    s0 = peg$c11;
                    peg$currPos += 10;
                  } else {
                    s0 = peg$FAILED;
                    if (peg$silentFails === 0) { peg$fail(peg$e11); }
                  }
                  if (s0 === peg$FAILED) {
                    if (input.substr(peg$currPos, 11) === peg$c12) {
                      s0 = peg$c12;
                      peg$currPos += 11;
                    } else {
                      s0 = peg$FAILED;
                      if (peg$silentFails === 0) { peg$fail(peg$e12); }
                    }
                    if (s0 === peg$FAILED) {
                      if (input.substr(peg$currPos, 4) === peg$c13) {
                        s0 = peg$c13;
                        peg$currPos += 4;
                      } else {
                        s0 = peg$FAILED;
                        if (peg$silentFails === 0) { peg$fail(peg$e13); }
                      }
                      if (s0 === peg$FAILED) {
                        if (input.substr(peg$currPos, 4) === peg$c14) {
                          s0 = peg$c14;
                          peg$currPos += 4;
                        } else {
                          s0 = peg$FAILED;
                          if (peg$silentFails === 0) { peg$fail(peg$e14); }
                        }
                        if (s0 === peg$FAILED) {
                          if (input.substr(peg$currPos, 8) === peg$c15) {
                            s0 = peg$c15;
                            peg$currPos += 8;
                          } else {
                            s0 = peg$FAILED;
                            if (peg$silentFails === 0) { peg$fail(peg$e15); }
                          }
                        }
                      }
                    }
                  }
                }
              }
            }
          }
        }
      }
    }

    return s0;
  }

  function peg$parseExpressionList() {
    let s0, s1, s2, s3, s4, s5;

    s0 = peg$currPos;
    s1 = peg$parseExpression();
    if (s1 !== peg$FAILED) {
      s2 = [];
      s3 = peg$currPos;
      s4 = peg$parse_();
      s5 = peg$parseExpression();
      if (s5 !== peg$FAILED) {
        s4 = [s4, s5];
        s3 = s4;
      } else {
        peg$currPos = s3;
        s3 = peg$FAILED;
      }
      while (s3 !== peg$FAILED) {
        s2.push(s3);
        s3 = peg$currPos;
        s4 = peg$parse_();
        s5 = peg$parseExpression();
        if (s5 !== peg$FAILED) {
          s4 = [s4, s5];
          s3 = s4;
        } else {
          peg$currPos = s3;
          s3 = peg$FAILED;
        }
      }
      peg$savedPos = s0;
      s0 = peg$f3(s1, s2);
    } else {
      peg$currPos = s0;
      s0 = peg$FAILED;
    }

    return s0;
  }

  function peg$parseChallengePredicate() {
    let s0, s1, s2, s3, s4, s5, s6, s7, s8;

    s0 = peg$currPos;
    if (input.charCodeAt(peg$currPos) === 42) {
      s1 = peg$c16;
      peg$currPos++;
    } else {
      s1 = peg$FAILED;
      if (peg$silentFails === 0) { peg$fail(peg$e16); }
    }
    if (s1 !== peg$FAILED) {
      s2 = peg$parseIdentifier();
      if (s2 !== peg$FAILED) {
        s3 = peg$parse_();
        if (input.charCodeAt(peg$currPos) === 40) {
          s4 = peg$c17;
          peg$currPos++;
        } else {
          s4 = peg$FAILED;
          if (peg$silentFails === 0) { peg$fail(peg$e17); }
        }
        if (s4 !== peg$FAILED) {
          s5 = peg$parse_();
          s6 = peg$parseArgumentList();
          if (s6 === peg$FAILED) {
            s6 = null;
          }
          s7 = peg$parse_();
          if (input.charCodeAt(peg$currPos) === 41) {
            s8 = peg$c18;
            peg$currPos++;
          } else {
            s8 = peg$FAILED;
            if (peg$silentFails === 0) { peg$fail(peg$e18); }
          }
          if (s8 !== peg$FAILED) {
            peg$savedPos = s0;
            s0 = peg$f4(s2, s6);
          } else {
            peg$currPos = s0;
            s0 = peg$FAILED;
          }
        } else {
          peg$currPos = s0;
          s0 = peg$FAILED;
        }
      } else {
        peg$currPos = s0;
        s0 = peg$FAILED;
      }
    } else {
      peg$currPos = s0;
      s0 = peg$FAILED;
    }

    return s0;
  }

  function peg$parsePredicateCall() {
    let s0, s1, s2, s3, s4, s5, s6, s7;

    s0 = peg$currPos;
    s1 = peg$parseIdentifier();
    if (s1 !== peg$FAILED) {
      s2 = peg$parse_();
      if (input.charCodeAt(peg$currPos) === 40) {
        s3 = peg$c17;
        peg$currPos++;
      } else {
        s3 = peg$FAILED;
        if (peg$silentFails === 0) { peg$fail(peg$e17); }
      }
      if (s3 !== peg$FAILED) {
        s4 = peg$parse_();
        s5 = peg$parseArgumentList();
        if (s5 === peg$FAILED) {
          s5 = null;
        }
        s6 = peg$parse_();
        if (input.charCodeAt(peg$currPos) === 41) {
          s7 = peg$c18;
          peg$currPos++;
        } else {
          s7 = peg$FAILED;
          if (peg$silentFails === 0) { peg$fail(peg$e18); }
        }
        if (s7 !== peg$FAILED) {
          peg$savedPos = s0;
          s0 = peg$f5(s1, s5);
        } else {
          peg$currPos = s0;
          s0 = peg$FAILED;
        }
      } else {
        peg$currPos = s0;
        s0 = peg$FAILED;
      }
    } else {
      peg$currPos = s0;
      s0 = peg$FAILED;
    }

    return s0;
  }

  function peg$parseArgumentList() {
    let s0, s1, s2, s3, s4, s5, s6, s7;

    s0 = peg$currPos;
    s1 = peg$parseArgument();
    if (s1 !== peg$FAILED) {
      s2 = [];
      s3 = peg$currPos;
      s4 = peg$parse_();
      if (input.charCodeAt(peg$currPos) === 44) {
        s5 = peg$c19;
        peg$currPos++;
      } else {
        s5 = peg$FAILED;
        if (peg$silentFails === 0) { peg$fail(peg$e19); }
      }
      if (s5 !== peg$FAILED) {
        s6 = peg$parse_();
        s7 = peg$parseArgument();
        if (s7 !== peg$FAILED) {
          s4 = [s4, s5, s6, s7];
          s3 = s4;
        } else {
          peg$currPos = s3;
          s3 = peg$FAILED;
        }
      } else {
        peg$currPos = s3;
        s3 = peg$FAILED;
      }
      while (s3 !== peg$FAILED) {
        s2.push(s3);
        s3 = peg$currPos;
        s4 = peg$parse_();
        if (input.charCodeAt(peg$currPos) === 44) {
          s5 = peg$c19;
          peg$currPos++;
        } else {
          s5 = peg$FAILED;
          if (peg$silentFails === 0) { peg$fail(peg$e19); }
        }
        if (s5 !== peg$FAILED) {
          s6 = peg$parse_();
          s7 = peg$parseArgument();
          if (s7 !== peg$FAILED) {
            s4 = [s4, s5, s6, s7];
            s3 = s4;
          } else {
            peg$currPos = s3;
            s3 = peg$FAILED;
          }
        } else {
          peg$currPos = s3;
          s3 = peg$FAILED;
        }
      }
      peg$savedPos = s0;
      s0 = peg$f6(s1, s2);
    } else {
      peg$currPos = s0;
      s0 = peg$FAILED;
    }

    return s0;
  }

  function peg$parseArgument() {
    let s0;

    s0 = peg$parseVariableBinding();
    if (s0 === peg$FAILED) {
      s0 = peg$parseLiteral();
      if (s0 === peg$FAILED) {
        s0 = peg$parseTypedReference();
      }
    }

    return s0;
  }

  function peg$parseVariableBinding() {
    let s0, s1, s2, s3, s4, s5, s6;

    s0 = peg$currPos;
    if (input.charCodeAt(peg$currPos) === 58) {
      s1 = peg$c20;
      peg$currPos++;
    } else {
      s1 = peg$FAILED;
      if (peg$silentFails === 0) { peg$fail(peg$e20); }
    }
    if (s1 !== peg$FAILED) {
      s2 = peg$parseIdentifier();
      if (s2 !== peg$FAILED) {
        s3 = [];
        s4 = peg$currPos;
        if (input.charCodeAt(peg$currPos) === 46) {
          s5 = peg$c21;
          peg$currPos++;
        } else {
          s5 = peg$FAILED;
          if (peg$silentFails === 0) { peg$fail(peg$e21); }
        }
        if (s5 !== peg$FAILED) {
          s6 = peg$parseIdentifier();
          if (s6 !== peg$FAILED) {
            s5 = [s5, s6];
            s4 = s5;
          } else {
            peg$currPos = s4;
            s4 = peg$FAILED;
          }
        } else {
          peg$currPos = s4;
          s4 = peg$FAILED;
        }
        while (s4 !== peg$FAILED) {
          s3.push(s4);
          s4 = peg$currPos;
          if (input.charCodeAt(peg$currPos) === 46) {
            s5 = peg$c21;
            peg$currPos++;
          } else {
            s5 = peg$FAILED;
            if (peg$silentFails === 0) { peg$fail(peg$e21); }
          }
          if (s5 !== peg$FAILED) {
            s6 = peg$parseIdentifier();
            if (s6 !== peg$FAILED) {
              s5 = [s5, s6];
              s4 = s5;
            } else {
              peg$currPos = s4;
              s4 = peg$FAILED;
            }
          } else {
            peg$currPos = s4;
            s4 = peg$FAILED;
          }
        }
        peg$savedPos = s0;
        s0 = peg$f7(s2, s3);
      } else {
        peg$currPos = s0;
        s0 = peg$FAILED;
      }
    } else {
      peg$currPos = s0;
      s0 = peg$FAILED;
    }

    return s0;
  }

  function peg$parseTypedReference() {
    let s0, s1, s2, s3;

    s0 = peg$currPos;
    s1 = peg$parseIdentifier();
    if (s1 !== peg$FAILED) {
      if (input.substr(peg$currPos, 2) === peg$c22) {
        s2 = peg$c22;
        peg$currPos += 2;
      } else {
        s2 = peg$FAILED;
        if (peg$silentFails === 0) { peg$fail(peg$e22); }
      }
      if (s2 !== peg$FAILED) {
        s3 = peg$parsePath();
        if (s3 !== peg$FAILED) {
          peg$savedPos = s0;
          s0 = peg$f8(s1, s3);
        } else {
          peg$currPos = s0;
          s0 = peg$FAILED;
        }
      } else {
        peg$currPos = s0;
        s0 = peg$FAILED;
      }
    } else {
      peg$currPos = s0;
      s0 = peg$FAILED;
    }

    return s0;
  }

  function peg$parsePath() {
    let s0, s1, s2, s3, s4, s5;

    s0 = peg$currPos;
    s1 = peg$parseIdentifier();
    if (s1 !== peg$FAILED) {
      s2 = [];
      s3 = peg$currPos;
      if (input.charCodeAt(peg$currPos) === 46) {
        s4 = peg$c21;
        peg$currPos++;
      } else {
        s4 = peg$FAILED;
        if (peg$silentFails === 0) { peg$fail(peg$e21); }
      }
      if (s4 !== peg$FAILED) {
        s5 = peg$parseIdentifier();
        if (s5 !== peg$FAILED) {
          s4 = [s4, s5];
          s3 = s4;
        } else {
          peg$currPos = s3;
          s3 = peg$FAILED;
        }
      } else {
        peg$currPos = s3;
        s3 = peg$FAILED;
      }
      while (s3 !== peg$FAILED) {
        s2.push(s3);
        s3 = peg$currPos;
        if (input.charCodeAt(peg$currPos) === 46) {
          s4 = peg$c21;
          peg$currPos++;
        } else {
          s4 = peg$FAILED;
          if (peg$silentFails === 0) { peg$fail(peg$e21); }
        }
        if (s4 !== peg$FAILED) {
          s5 = peg$parseIdentifier();
          if (s5 !== peg$FAILED) {
            s4 = [s4, s5];
            s3 = s4;
          } else {
            peg$currPos = s3;
            s3 = peg$FAILED;
          }
        } else {
          peg$currPos = s3;
          s3 = peg$FAILED;
        }
      }
      peg$savedPos = s0;
      s0 = peg$f9(s1, s2);
    } else {
      peg$currPos = s0;
      s0 = peg$FAILED;
    }

    return s0;
  }

  function peg$parseLiteral() {
    let s0;

    s0 = peg$parseStringLiteral();
    if (s0 === peg$FAILED) {
      s0 = peg$parseNumberLiteral();
    }

    return s0;
  }

  function peg$parseStringLiteral() {
    let s0, s1, s2, s3;

    s0 = peg$currPos;
    if (input.charCodeAt(peg$currPos) === 34) {
      s1 = peg$c23;
      peg$currPos++;
    } else {
      s1 = peg$FAILED;
      if (peg$silentFails === 0) { peg$fail(peg$e23); }
    }
    if (s1 !== peg$FAILED) {
      s2 = [];
      s3 = input.charAt(peg$currPos);
      if (peg$r0.test(s3)) {
        peg$currPos++;
      } else {
        s3 = peg$FAILED;
        if (peg$silentFails === 0) { peg$fail(peg$e24); }
      }
      if (s3 === peg$FAILED) {
        s3 = peg$parseEscapeSequence();
      }
      while (s3 !== peg$FAILED) {
        s2.push(s3);
        s3 = input.charAt(peg$currPos);
        if (peg$r0.test(s3)) {
          peg$currPos++;
        } else {
          s3 = peg$FAILED;
          if (peg$silentFails === 0) { peg$fail(peg$e24); }
        }
        if (s3 === peg$FAILED) {
          s3 = peg$parseEscapeSequence();
        }
      }
      if (input.charCodeAt(peg$currPos) === 34) {
        s3 = peg$c23;
        peg$currPos++;
      } else {
        s3 = peg$FAILED;
        if (peg$silentFails === 0) { peg$fail(peg$e23); }
      }
      if (s3 !== peg$FAILED) {
        peg$savedPos = s0;
        s0 = peg$f10(s2);
      } else {
        peg$currPos = s0;
        s0 = peg$FAILED;
      }
    } else {
      peg$currPos = s0;
      s0 = peg$FAILED;
    }
    if (s0 === peg$FAILED) {
      s0 = peg$currPos;
      if (input.charCodeAt(peg$currPos) === 39) {
        s1 = peg$c24;
        peg$currPos++;
      } else {
        s1 = peg$FAILED;
        if (peg$silentFails === 0) { peg$fail(peg$e25); }
      }
      if (s1 !== peg$FAILED) {
        s2 = [];
        s3 = input.charAt(peg$currPos);
        if (peg$r1.test(s3)) {
          peg$currPos++;
        } else {
          s3 = peg$FAILED;
          if (peg$silentFails === 0) { peg$fail(peg$e26); }
        }
        if (s3 === peg$FAILED) {
          s3 = peg$parseEscapeSequence();
        }
        while (s3 !== peg$FAILED) {
          s2.push(s3);
          s3 = input.charAt(peg$currPos);
          if (peg$r1.test(s3)) {
            peg$currPos++;
          } else {
            s3 = peg$FAILED;
            if (peg$silentFails === 0) { peg$fail(peg$e26); }
          }
          if (s3 === peg$FAILED) {
            s3 = peg$parseEscapeSequence();
          }
        }
        if (input.charCodeAt(peg$currPos) === 39) {
          s3 = peg$c24;
          peg$currPos++;
        } else {
          s3 = peg$FAILED;
          if (peg$silentFails === 0) { peg$fail(peg$e25); }
        }
        if (s3 !== peg$FAILED) {
          peg$savedPos = s0;
          s0 = peg$f11(s2);
        } else {
          peg$currPos = s0;
          s0 = peg$FAILED;
        }
      } else {
        peg$currPos = s0;
        s0 = peg$FAILED;
      }
    }

    return s0;
  }

  function peg$parseEscapeSequence() {
    let s0, s1, s2;

    s0 = peg$currPos;
    if (input.charCodeAt(peg$currPos) === 92) {
      s1 = peg$c25;
      peg$currPos++;
    } else {
      s1 = peg$FAILED;
      if (peg$silentFails === 0) { peg$fail(peg$e27); }
    }
    if (s1 !== peg$FAILED) {
      s2 = input.charAt(peg$currPos);
      if (peg$r2.test(s2)) {
        peg$currPos++;
      } else {
        s2 = peg$FAILED;
        if (peg$silentFails === 0) { peg$fail(peg$e28); }
      }
      if (s2 !== peg$FAILED) {
        peg$savedPos = s0;
        s0 = peg$f12(s2);
      } else {
        peg$currPos = s0;
        s0 = peg$FAILED;
      }
    } else {
      peg$currPos = s0;
      s0 = peg$FAILED;
    }

    return s0;
  }

  function peg$parseNumberLiteral() {
    let s0, s1, s2;

    s0 = peg$currPos;
    s1 = [];
    s2 = input.charAt(peg$currPos);
    if (peg$r3.test(s2)) {
      peg$currPos++;
    } else {
      s2 = peg$FAILED;
      if (peg$silentFails === 0) { peg$fail(peg$e29); }
    }
    if (s2 !== peg$FAILED) {
      while (s2 !== peg$FAILED) {
        s1.push(s2);
        s2 = input.charAt(peg$currPos);
        if (peg$r3.test(s2)) {
          peg$currPos++;
        } else {
          s2 = peg$FAILED;
          if (peg$silentFails === 0) { peg$fail(peg$e29); }
        }
      }
    } else {
      s1 = peg$FAILED;
    }
    if (s1 !== peg$FAILED) {
      peg$savedPos = s0;
      s1 = peg$f13(s1);
    }
    s0 = s1;

    return s0;
  }

  function peg$parseIdentifier() {
    let s0, s1, s2, s3;

    s0 = peg$currPos;
    s1 = input.charAt(peg$currPos);
    if (peg$r4.test(s1)) {
      peg$currPos++;
    } else {
      s1 = peg$FAILED;
      if (peg$silentFails === 0) { peg$fail(peg$e30); }
    }
    if (s1 !== peg$FAILED) {
      s2 = [];
      s3 = input.charAt(peg$currPos);
      if (peg$r5.test(s3)) {
        peg$currPos++;
      } else {
        s3 = peg$FAILED;
        if (peg$silentFails === 0) { peg$fail(peg$e31); }
      }
      while (s3 !== peg$FAILED) {
        s2.push(s3);
        s3 = input.charAt(peg$currPos);
        if (peg$r5.test(s3)) {
          peg$currPos++;
        } else {
          s3 = peg$FAILED;
          if (peg$silentFails === 0) { peg$fail(peg$e31); }
        }
      }
      peg$savedPos = s0;
      s0 = peg$f14(s1, s2);
    } else {
      peg$currPos = s0;
      s0 = peg$FAILED;
    }

    return s0;
  }

  function peg$parse_() {
    let s0, s1;

    peg$silentFails++;
    s0 = [];
    s1 = peg$parseWS();
    if (s1 === peg$FAILED) {
      s1 = peg$parseLineComment();
      if (s1 === peg$FAILED) {
        s1 = peg$parseBlockComment();
      }
    }
    while (s1 !== peg$FAILED) {
      s0.push(s1);
      s1 = peg$parseWS();
      if (s1 === peg$FAILED) {
        s1 = peg$parseLineComment();
        if (s1 === peg$FAILED) {
          s1 = peg$parseBlockComment();
        }
      }
    }
    peg$silentFails--;

    return s0;
  }

  function peg$parseWS() {
    let s0, s1;

    s0 = [];
    s1 = input.charAt(peg$currPos);
    if (peg$r6.test(s1)) {
      peg$currPos++;
    } else {
      s1 = peg$FAILED;
      if (peg$silentFails === 0) { peg$fail(peg$e32); }
    }
    if (s1 !== peg$FAILED) {
      while (s1 !== peg$FAILED) {
        s0.push(s1);
        s1 = input.charAt(peg$currPos);
        if (peg$r6.test(s1)) {
          peg$currPos++;
        } else {
          s1 = peg$FAILED;
          if (peg$silentFails === 0) { peg$fail(peg$e32); }
        }
      }
    } else {
      s0 = peg$FAILED;
    }

    return s0;
  }

  function peg$parseLineComment() {
    let s0, s1, s2, s3;

    s0 = peg$currPos;
    if (input.substr(peg$currPos, 2) === peg$c26) {
      s1 = peg$c26;
      peg$currPos += 2;
    } else {
      s1 = peg$FAILED;
      if (peg$silentFails === 0) { peg$fail(peg$e33); }
    }
    if (s1 !== peg$FAILED) {
      s2 = [];
      s3 = input.charAt(peg$currPos);
      if (peg$r7.test(s3)) {
        peg$currPos++;
      } else {
        s3 = peg$FAILED;
        if (peg$silentFails === 0) { peg$fail(peg$e34); }
      }
      while (s3 !== peg$FAILED) {
        s2.push(s3);
        s3 = input.charAt(peg$currPos);
        if (peg$r7.test(s3)) {
          peg$currPos++;
        } else {
          s3 = peg$FAILED;
          if (peg$silentFails === 0) { peg$fail(peg$e34); }
        }
      }
      s1 = [s1, s2];
      s0 = s1;
    } else {
      peg$currPos = s0;
      s0 = peg$FAILED;
    }

    return s0;
  }

  function peg$parseBlockComment() {
    let s0, s1, s2, s3, s4, s5;

    s0 = peg$currPos;
    if (input.substr(peg$currPos, 2) === peg$c27) {
      s1 = peg$c27;
      peg$currPos += 2;
    } else {
      s1 = peg$FAILED;
      if (peg$silentFails === 0) { peg$fail(peg$e35); }
    }
    if (s1 !== peg$FAILED) {
      s2 = [];
      s3 = peg$currPos;
      s4 = peg$currPos;
      peg$silentFails++;
      if (input.substr(peg$currPos, 2) === peg$c28) {
        s5 = peg$c28;
        peg$currPos += 2;
      } else {
        s5 = peg$FAILED;
        if (peg$silentFails === 0) { peg$fail(peg$e36); }
      }
      peg$silentFails--;
      if (s5 === peg$FAILED) {
        s4 = undefined;
      } else {
        peg$currPos = s4;
        s4 = peg$FAILED;
      }
      if (s4 !== peg$FAILED) {
        if (input.length > peg$currPos) {
          s5 = input.charAt(peg$currPos);
          peg$currPos++;
        } else {
          s5 = peg$FAILED;
          if (peg$silentFails === 0) { peg$fail(peg$e37); }
        }
        if (s5 !== peg$FAILED) {
          s4 = [s4, s5];
          s3 = s4;
        } else {
          peg$currPos = s3;
          s3 = peg$FAILED;
        }
      } else {
        peg$currPos = s3;
        s3 = peg$FAILED;
      }
      while (s3 !== peg$FAILED) {
        s2.push(s3);
        s3 = peg$currPos;
        s4 = peg$currPos;
        peg$silentFails++;
        if (input.substr(peg$currPos, 2) === peg$c28) {
          s5 = peg$c28;
          peg$currPos += 2;
        } else {
          s5 = peg$FAILED;
          if (peg$silentFails === 0) { peg$fail(peg$e36); }
        }
        peg$silentFails--;
        if (s5 === peg$FAILED) {
          s4 = undefined;
        } else {
          peg$currPos = s4;
          s4 = peg$FAILED;
        }
        if (s4 !== peg$FAILED) {
          if (input.length > peg$currPos) {
            s5 = input.charAt(peg$currPos);
            peg$currPos++;
          } else {
            s5 = peg$FAILED;
            if (peg$silentFails === 0) { peg$fail(peg$e37); }
          }
          if (s5 !== peg$FAILED) {
            s4 = [s4, s5];
            s3 = s4;
          } else {
            peg$currPos = s3;
            s3 = peg$FAILED;
          }
        } else {
          peg$currPos = s3;
          s3 = peg$FAILED;
        }
      }
      if (input.substr(peg$currPos, 2) === peg$c28) {
        s3 = peg$c28;
        peg$currPos += 2;
      } else {
        s3 = peg$FAILED;
        if (peg$silentFails === 0) { peg$fail(peg$e36); }
      }
      if (s3 !== peg$FAILED) {
        s1 = [s1, s2, s3];
        s0 = s1;
      } else {
        peg$currPos = s0;
        s0 = peg$FAILED;
      }
    } else {
      peg$currPos = s0;
      s0 = peg$FAILED;
    }

    return s0;
  }


  // Helper functions
  function makeVariable(name, path) {
    return { type: 'Variable', name, path: path || [] };
  }

  function makePredicate(name, args) {
    return { type: 'Predicate', name, args: args || [] };
  }

  function makeChallengePredicate(name, args) {
    return { type: 'Predicate', name, args: args || [], challenge: true };
  }

  function makeFusion(expressions, aggregator) {
    return { type: 'Fusion', aggregator, expressions };
  }

  function makeDefeasible(primary, exception) {
    return { type: 'Defeasible', primary, exception };
  }

  peg$result = peg$startRuleFunction();

  const peg$success = (peg$result !== peg$FAILED && peg$currPos === input.length);
  function peg$throw() {
    if (peg$result !== peg$FAILED && peg$currPos < input.length) {
      peg$fail(peg$endExpectation());
    }

    throw peg$buildStructuredError(
      peg$maxFailExpected,
      peg$maxFailPos < input.length ? peg$getUnicode(peg$maxFailPos) : null,
      peg$maxFailPos < input.length
        ? peg$computeLocation(peg$maxFailPos, peg$maxFailPos + 1)
        : peg$computeLocation(peg$maxFailPos, peg$maxFailPos)
    );
  }
  if (options.peg$library) {
    return /** @type {any} */ ({
      peg$result,
      peg$currPos,
      peg$FAILED,
      peg$maxFailExpected,
      peg$maxFailPos,
      peg$success,
      peg$throw: peg$success ? undefined : peg$throw,
    });
  }
  if (peg$success) {
    return peg$result;
  } else {
    peg$throw();
  }
}

const peg$allowedStartRules = [
  "Expression"
];

export {
  peg$allowedStartRules as StartRules,
  peg$SyntaxError as SyntaxError,
  peg$parse as parse
};