// Generated by Peggy 1.2.0.
//
// https://peggyjs.org/

"use strict";

function peg$subclass(child, parent) {
  function C() { this.constructor = child; }
  C.prototype = parent.prototype;
  child.prototype = new C();
}

function peg$SyntaxError(message, expected, found, location) {
  var self = Error.call(this, message);
  if (Object.setPrototypeOf) {
    Object.setPrototypeOf(self, peg$SyntaxError.prototype);
  }
  self.expected = expected;
  self.found = found;
  self.location = location;
  self.name = "SyntaxError";
  return self;
}

peg$subclass(peg$SyntaxError, Error);

function peg$padEnd(str, targetLength, padString) {
  padString = padString || " ";
  if (str.length > targetLength) { return str; }
  targetLength -= str.length;
  padString += padString.repeat(targetLength);
  return str + padString.slice(0, targetLength);
}

peg$SyntaxError.prototype.format = function(sources) {
  var str = "Error: " + this.message;
  if (this.location) {
    var src = null;
    var k;
    for (k = 0; k < sources.length; k++) {
      if (sources[k].source === this.location.source) {
        src = sources[k].text.split(/\r\n|\n|\r/g);
        break;
      }
    }
    var s = this.location.start;
    var loc = this.location.source + ":" + s.line + ":" + s.column;
    if (src) {
      var e = this.location.end;
      var filler = peg$padEnd("", s.line.toString().length);
      var line = src[s.line - 1];
      var last = s.line === e.line ? e.column : line.length + 1;
      str += "\n --> " + loc + "\n"
          + filler + " |\n"
          + s.line + " | " + line + "\n"
          + filler + " | " + peg$padEnd("", s.column - 1)
          + peg$padEnd("", last - s.column, "^");
    } else {
      str += "\n at " + loc;
    }
  }
  return str;
};

peg$SyntaxError.buildMessage = function(expected, found) {
  var DESCRIBE_EXPECTATION_FNS = {
    literal: function(expectation) {
      return "\"" + literalEscape(expectation.text) + "\"";
    },

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

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

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

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

    other: function(expectation) {
      return expectation.description;
    }
  };

  function hex(ch) {
    return ch.charCodeAt(0).toString(16).toUpperCase();
  }

  function literalEscape(s) {
    return 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,          function(ch) { return "\\x0" + hex(ch); })
      .replace(/[\x10-\x1F\x7F-\x9F]/g, function(ch) { return "\\x"  + hex(ch); });
  }

  function classEscape(s) {
    return 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,          function(ch) { return "\\x0" + hex(ch); })
      .replace(/[\x10-\x1F\x7F-\x9F]/g, function(ch) { return "\\x"  + hex(ch); });
  }

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

  function describeExpected(expected) {
    var descriptions = expected.map(describeExpectation);
    var i, j;

    descriptions.sort();

    if (descriptions.length > 0) {
      for (i = 1, j = 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 : {};

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

  var peg$startRuleFunctions = { start: peg$parsestart };
  var peg$startRuleFunction = peg$parsestart;

  var peg$c0 = "\"";
  var peg$c1 = "\\\"";
  var peg$c2 = "'";
  var peg$c3 = "\\'";
  var peg$c4 = ">";
  var peg$c5 = "<";
  var peg$c6 = "=";
  var peg$c7 = "+";
  var peg$c8 = "-";
  var peg$c9 = "*";
  var peg$c10 = "/";
  var peg$c11 = "(";
  var peg$c12 = ")";
  var peg$c13 = ",";
  var peg$c14 = ".";
  var peg$c15 = "0";

  var peg$r0 = /^[ \t\n\r]/;
  var peg$r1 = /^[ ]/;
  var peg$r2 = /^["']/;
  var peg$r3 = /^[A-Za-z_@.[\]\-]/;
  var peg$r4 = /^[0-9A-Za-z._@[\]\-]/;
  var peg$r5 = /^[^"]/;
  var peg$r6 = /^[^']/;
  var peg$r7 = /^[a-zA-Z_]/;
  var peg$r8 = /^[a-zA-Z_\-]/;
  var peg$r9 = /^[eE]/;
  var peg$r10 = /^[1-9]/;
  var peg$r11 = /^[0-9]/;

  var peg$e0 = peg$otherExpectation("whitespace");
  var peg$e1 = peg$classExpectation([" ", "\t", "\n", "\r"], false, false);
  var peg$e2 = peg$classExpectation([" "], false, false);
  var peg$e3 = peg$classExpectation(["\"", "'"], false, false);
  var peg$e4 = peg$classExpectation([["A", "Z"], ["a", "z"], "_", "@", ".", "[", "]", "-"], false, false);
  var peg$e5 = peg$classExpectation([["0", "9"], ["A", "Z"], ["a", "z"], ".", "_", "@", "[", "]", "-"], false, false);
  var peg$e6 = peg$otherExpectation("literal");
  var peg$e7 = peg$literalExpectation("\"", false);
  var peg$e8 = peg$literalExpectation("\\\"", false);
  var peg$e9 = peg$classExpectation(["\""], true, false);
  var peg$e10 = peg$literalExpectation("'", false);
  var peg$e11 = peg$literalExpectation("\\'", false);
  var peg$e12 = peg$classExpectation(["'"], true, false);
  var peg$e13 = peg$literalExpectation(">", false);
  var peg$e14 = peg$literalExpectation("<", false);
  var peg$e15 = peg$literalExpectation("=", false);
  var peg$e16 = peg$literalExpectation("+", false);
  var peg$e17 = peg$literalExpectation("-", false);
  var peg$e18 = peg$literalExpectation("*", false);
  var peg$e19 = peg$literalExpectation("/", false);
  var peg$e20 = peg$literalExpectation("(", false);
  var peg$e21 = peg$literalExpectation(")", false);
  var peg$e22 = peg$otherExpectation("arguments");
  var peg$e23 = peg$literalExpectation(",", false);
  var peg$e24 = peg$classExpectation([["a", "z"], ["A", "Z"], "_"], false, false);
  var peg$e25 = peg$otherExpectation("function");
  var peg$e26 = peg$classExpectation([["a", "z"], ["A", "Z"], "_", "-"], false, false);
  var peg$e27 = peg$otherExpectation("number");
  var peg$e28 = peg$classExpectation(["e", "E"], false, false);
  var peg$e29 = peg$otherExpectation("exponent");
  var peg$e30 = peg$literalExpectation(".", false);
  var peg$e31 = peg$literalExpectation("0", false);
  var peg$e32 = peg$classExpectation([["1", "9"]], false, false);
  var peg$e33 = peg$classExpectation([["0", "9"]], false, false);

  var peg$f0 = function(literal) {
      return literal;
    };
  var peg$f1 = function() { return "\""; };
  var peg$f2 = function(chars) {
      return {
        type: 'variable',
        value: chars.join(''),
        location: simpleLocation(location()),
        text: text()
      };
    };
  var peg$f3 = function() { return "\'"; };
  var peg$f4 = function(chars) {
        return {
        type: 'variable',
        value: chars.join(''),
        location: simpleLocation(location()),
        text: text()
      };
    };
  var peg$f5 = function(rest) {
      return {
        type: 'variable',
        value: rest.join(''),
        location: simpleLocation(location()),
        text: text()
      };
    };
  var peg$f6 = function(left, op, right) {
      return {
        type: 'function',
        name: getComparisonSymbol(op),
        args: [left, right],
        location: simpleLocation(location()),
        text: text()
      };
    };
  var peg$f7 = function(left, rest) {
      return parseSymbol(left, rest, {'+': 'add', '-': 'subtract'});
    };
  var peg$f8 = function(left, rest) {
      return parseSymbol(left, rest, {'*': 'multiply', '/': 'divide'});
    };
  var peg$f9 = function(expr) {
      return expr
    };
  var peg$f10 = function(first, arg) {return arg};
  var peg$f11 = function(first, rest) {
      return [first].concat(rest);
    };
  var peg$f12 = function(chars) { return chars.join(''); };
  var peg$f13 = function(name, value) {
    return {
      type: 'namedArgument',
      name: name.join(''),
      value: value,
      location: simpleLocation(location()),
      text: text()
    };
   };
  var peg$f14 = function(name, args) {
      return {
        type: 'function',
        name: name.join(''),
        args: args || [],
        location: simpleLocation(location()),
        text: text()
      };
    };
  var peg$f15 = function() {
      return parseFloat(text());
    };

  var peg$currPos = 0;
  var peg$savedPos = 0;
  var peg$posDetailsCache = [{ line: 1, column: 1 }];
  var peg$maxFailPos = 0;
  var peg$maxFailExpected = [];
  var peg$silentFails = 0;

  var peg$result;

  if ("startRule" in options) {
    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$literalExpectation(text, ignoreCase) {
    return { type: "literal", text: text, ignoreCase: ignoreCase };
  }

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

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

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

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

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

    if (details) {
      return details;
    } else {
      p = pos - 1;
      while (!peg$posDetailsCache[p]) {
        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$computeLocation(startPos, endPos) {
    var startPosDetails = peg$computePosDetails(startPos);
    var endPosDetails = peg$computePosDetails(endPos);

    return {
      source: peg$source,
      start: {
        offset: startPos,
        line: startPosDetails.line,
        column: startPosDetails.column
      },
      end: {
        offset: endPos,
        line: endPosDetails.line,
        column: endPosDetails.column
      }
    };
  }

  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$parsestart() {
    var s0;

    s0 = peg$parseExpression();

    return s0;
  }

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

    peg$silentFails++;
    s0 = [];
    if (peg$r0.test(input.charAt(peg$currPos))) {
      s1 = input.charAt(peg$currPos);
      peg$currPos++;
    } else {
      s1 = peg$FAILED;
      if (peg$silentFails === 0) { peg$fail(peg$e1); }
    }
    while (s1 !== peg$FAILED) {
      s0.push(s1);
      if (peg$r0.test(input.charAt(peg$currPos))) {
        s1 = input.charAt(peg$currPos);
        peg$currPos++;
      } else {
        s1 = peg$FAILED;
        if (peg$silentFails === 0) { peg$fail(peg$e1); }
      }
    }
    peg$silentFails--;
    s1 = peg$FAILED;
    if (peg$silentFails === 0) { peg$fail(peg$e0); }

    return s0;
  }

  function peg$parseSpace() {
    var s0;

    if (peg$r1.test(input.charAt(peg$currPos))) {
      s0 = input.charAt(peg$currPos);
      peg$currPos++;
    } else {
      s0 = peg$FAILED;
      if (peg$silentFails === 0) { peg$fail(peg$e2); }
    }

    return s0;
  }

  function peg$parseQuote() {
    var s0;

    if (peg$r2.test(input.charAt(peg$currPos))) {
      s0 = input.charAt(peg$currPos);
      peg$currPos++;
    } else {
      s0 = peg$FAILED;
      if (peg$silentFails === 0) { peg$fail(peg$e3); }
    }

    return s0;
  }

  function peg$parseStartChar() {
    var s0;

    if (peg$r3.test(input.charAt(peg$currPos))) {
      s0 = input.charAt(peg$currPos);
      peg$currPos++;
    } else {
      s0 = peg$FAILED;
      if (peg$silentFails === 0) { peg$fail(peg$e4); }
    }

    return s0;
  }

  function peg$parseValidChar() {
    var s0;

    if (peg$r4.test(input.charAt(peg$currPos))) {
      s0 = input.charAt(peg$currPos);
      peg$currPos++;
    } else {
      s0 = peg$FAILED;
      if (peg$silentFails === 0) { peg$fail(peg$e5); }
    }

    return s0;
  }

  function peg$parseLiteral() {
    var s0, s1, s2, s3;

    peg$silentFails++;
    s0 = peg$currPos;
    s1 = peg$parse_();
    s2 = peg$parseNumber();
    if (s2 === peg$FAILED) {
      s2 = peg$parseVariable();
    }
    if (s2 !== peg$FAILED) {
      s3 = peg$parse_();
      peg$savedPos = s0;
      s0 = peg$f0(s2);
    } else {
      peg$currPos = s0;
      s0 = peg$FAILED;
    }
    peg$silentFails--;
    if (s0 === peg$FAILED) {
      s1 = peg$FAILED;
      if (peg$silentFails === 0) { peg$fail(peg$e6); }
    }

    return s0;
  }

  function peg$parseVariable() {
    var s0, s1, s2, s3, s4, s5;

    s0 = peg$currPos;
    s1 = peg$parse_();
    if (input.charCodeAt(peg$currPos) === 34) {
      s2 = peg$c0;
      peg$currPos++;
    } else {
      s2 = peg$FAILED;
      if (peg$silentFails === 0) { peg$fail(peg$e7); }
    }
    if (s2 !== peg$FAILED) {
      s3 = [];
      s4 = peg$currPos;
      if (input.substr(peg$currPos, 2) === peg$c1) {
        s5 = peg$c1;
        peg$currPos += 2;
      } else {
        s5 = peg$FAILED;
        if (peg$silentFails === 0) { peg$fail(peg$e8); }
      }
      if (s5 !== peg$FAILED) {
        peg$savedPos = s4;
        s5 = peg$f1();
      }
      s4 = s5;
      if (s4 === peg$FAILED) {
        if (peg$r5.test(input.charAt(peg$currPos))) {
          s4 = input.charAt(peg$currPos);
          peg$currPos++;
        } else {
          s4 = peg$FAILED;
          if (peg$silentFails === 0) { peg$fail(peg$e9); }
        }
      }
      while (s4 !== peg$FAILED) {
        s3.push(s4);
        s4 = peg$currPos;
        if (input.substr(peg$currPos, 2) === peg$c1) {
          s5 = peg$c1;
          peg$currPos += 2;
        } else {
          s5 = peg$FAILED;
          if (peg$silentFails === 0) { peg$fail(peg$e8); }
        }
        if (s5 !== peg$FAILED) {
          peg$savedPos = s4;
          s5 = peg$f1();
        }
        s4 = s5;
        if (s4 === peg$FAILED) {
          if (peg$r5.test(input.charAt(peg$currPos))) {
            s4 = input.charAt(peg$currPos);
            peg$currPos++;
          } else {
            s4 = peg$FAILED;
            if (peg$silentFails === 0) { peg$fail(peg$e9); }
          }
        }
      }
      if (input.charCodeAt(peg$currPos) === 34) {
        s4 = peg$c0;
        peg$currPos++;
      } else {
        s4 = peg$FAILED;
        if (peg$silentFails === 0) { peg$fail(peg$e7); }
      }
      if (s4 !== peg$FAILED) {
        s5 = peg$parse_();
        peg$savedPos = s0;
        s0 = peg$f2(s3);
      } else {
        peg$currPos = s0;
        s0 = peg$FAILED;
      }
    } else {
      peg$currPos = s0;
      s0 = peg$FAILED;
    }
    if (s0 === peg$FAILED) {
      s0 = peg$currPos;
      s1 = peg$parse_();
      if (input.charCodeAt(peg$currPos) === 39) {
        s2 = peg$c2;
        peg$currPos++;
      } else {
        s2 = peg$FAILED;
        if (peg$silentFails === 0) { peg$fail(peg$e10); }
      }
      if (s2 !== peg$FAILED) {
        s3 = [];
        s4 = peg$currPos;
        if (input.substr(peg$currPos, 2) === peg$c3) {
          s5 = peg$c3;
          peg$currPos += 2;
        } else {
          s5 = peg$FAILED;
          if (peg$silentFails === 0) { peg$fail(peg$e11); }
        }
        if (s5 !== peg$FAILED) {
          peg$savedPos = s4;
          s5 = peg$f3();
        }
        s4 = s5;
        if (s4 === peg$FAILED) {
          if (peg$r6.test(input.charAt(peg$currPos))) {
            s4 = input.charAt(peg$currPos);
            peg$currPos++;
          } else {
            s4 = peg$FAILED;
            if (peg$silentFails === 0) { peg$fail(peg$e12); }
          }
        }
        while (s4 !== peg$FAILED) {
          s3.push(s4);
          s4 = peg$currPos;
          if (input.substr(peg$currPos, 2) === peg$c3) {
            s5 = peg$c3;
            peg$currPos += 2;
          } else {
            s5 = peg$FAILED;
            if (peg$silentFails === 0) { peg$fail(peg$e11); }
          }
          if (s5 !== peg$FAILED) {
            peg$savedPos = s4;
            s5 = peg$f3();
          }
          s4 = s5;
          if (s4 === peg$FAILED) {
            if (peg$r6.test(input.charAt(peg$currPos))) {
              s4 = input.charAt(peg$currPos);
              peg$currPos++;
            } else {
              s4 = peg$FAILED;
              if (peg$silentFails === 0) { peg$fail(peg$e12); }
            }
          }
        }
        if (input.charCodeAt(peg$currPos) === 39) {
          s4 = peg$c2;
          peg$currPos++;
        } else {
          s4 = peg$FAILED;
          if (peg$silentFails === 0) { peg$fail(peg$e10); }
        }
        if (s4 !== peg$FAILED) {
          s5 = peg$parse_();
          peg$savedPos = s0;
          s0 = peg$f4(s3);
        } else {
          peg$currPos = s0;
          s0 = peg$FAILED;
        }
      } else {
        peg$currPos = s0;
        s0 = peg$FAILED;
      }
      if (s0 === peg$FAILED) {
        s0 = peg$currPos;
        s1 = peg$parse_();
        s2 = [];
        s3 = peg$parseValidChar();
        if (s3 !== peg$FAILED) {
          while (s3 !== peg$FAILED) {
            s2.push(s3);
            s3 = peg$parseValidChar();
          }
        } else {
          s2 = peg$FAILED;
        }
        if (s2 !== peg$FAILED) {
          s3 = peg$parse_();
          peg$savedPos = s0;
          s0 = peg$f5(s2);
        } else {
          peg$currPos = s0;
          s0 = peg$FAILED;
        }
      }
    }

    return s0;
  }

  function peg$parseExpression() {
    var s0;

    s0 = peg$parseComparison();
    if (s0 === peg$FAILED) {
      s0 = peg$parseMathOperation();
      if (s0 === peg$FAILED) {
        s0 = peg$parseExpressionGroup();
      }
    }

    return s0;
  }

  function peg$parseComparison() {
    var s0, s1, s2, s3, s4, s5;

    s0 = peg$currPos;
    s1 = peg$parse_();
    s2 = peg$parseMathOperation();
    if (s2 !== peg$FAILED) {
      s3 = peg$currPos;
      if (input.charCodeAt(peg$currPos) === 62) {
        s4 = peg$c4;
        peg$currPos++;
      } else {
        s4 = peg$FAILED;
        if (peg$silentFails === 0) { peg$fail(peg$e13); }
      }
      if (s4 === peg$FAILED) {
        if (input.charCodeAt(peg$currPos) === 60) {
          s4 = peg$c5;
          peg$currPos++;
        } else {
          s4 = peg$FAILED;
          if (peg$silentFails === 0) { peg$fail(peg$e14); }
        }
      }
      if (s4 !== peg$FAILED) {
        if (input.charCodeAt(peg$currPos) === 61) {
          s5 = peg$c6;
          peg$currPos++;
        } else {
          s5 = peg$FAILED;
          if (peg$silentFails === 0) { peg$fail(peg$e15); }
        }
        if (s5 === peg$FAILED) {
          s5 = null;
        }
        s4 = [s4, s5];
        s3 = s4;
      } else {
        peg$currPos = s3;
        s3 = peg$FAILED;
      }
      if (s3 === peg$FAILED) {
        s3 = peg$currPos;
        if (input.charCodeAt(peg$currPos) === 61) {
          s4 = peg$c6;
          peg$currPos++;
        } else {
          s4 = peg$FAILED;
          if (peg$silentFails === 0) { peg$fail(peg$e15); }
        }
        if (s4 !== peg$FAILED) {
          if (input.charCodeAt(peg$currPos) === 61) {
            s5 = peg$c6;
            peg$currPos++;
          } else {
            s5 = peg$FAILED;
            if (peg$silentFails === 0) { peg$fail(peg$e15); }
          }
          if (s5 !== peg$FAILED) {
            s4 = [s4, s5];
            s3 = s4;
          } else {
            peg$currPos = s3;
            s3 = peg$FAILED;
          }
        } else {
          peg$currPos = s3;
          s3 = peg$FAILED;
        }
      }
      if (s3 !== peg$FAILED) {
        s4 = peg$parseMathOperation();
        if (s4 !== peg$FAILED) {
          s5 = peg$parse_();
          peg$savedPos = s0;
          s0 = peg$f6(s2, s3, s4);
        } else {
          peg$currPos = s0;
          s0 = peg$FAILED;
        }
      } else {
        peg$currPos = s0;
        s0 = peg$FAILED;
      }
    } else {
      peg$currPos = s0;
      s0 = peg$FAILED;
    }

    return s0;
  }

  function peg$parseMathOperation() {
    var s0;

    s0 = peg$parseAddSubtract();
    if (s0 === peg$FAILED) {
      s0 = peg$parseMultiplyDivide();
      if (s0 === peg$FAILED) {
        s0 = peg$parseFactor();
      }
    }

    return s0;
  }

  function peg$parseAddSubtract() {
    var s0, s1, s2, s3, s4, s5, s6;

    s0 = peg$currPos;
    s1 = peg$parse_();
    s2 = peg$parseMultiplyDivide();
    if (s2 !== peg$FAILED) {
      s3 = [];
      s4 = peg$currPos;
      if (input.charCodeAt(peg$currPos) === 43) {
        s5 = peg$c7;
        peg$currPos++;
      } else {
        s5 = peg$FAILED;
        if (peg$silentFails === 0) { peg$fail(peg$e16); }
      }
      if (s5 === peg$FAILED) {
        if (input.charCodeAt(peg$currPos) === 45) {
          s5 = peg$c8;
          peg$currPos++;
        } else {
          s5 = peg$FAILED;
          if (peg$silentFails === 0) { peg$fail(peg$e17); }
        }
      }
      if (s5 !== peg$FAILED) {
        s6 = peg$parseMultiplyDivide();
        if (s6 !== peg$FAILED) {
          s5 = [s5, s6];
          s4 = s5;
        } else {
          peg$currPos = s4;
          s4 = peg$FAILED;
        }
      } else {
        peg$currPos = s4;
        s4 = peg$FAILED;
      }
      if (s4 !== peg$FAILED) {
        while (s4 !== peg$FAILED) {
          s3.push(s4);
          s4 = peg$currPos;
          if (input.charCodeAt(peg$currPos) === 43) {
            s5 = peg$c7;
            peg$currPos++;
          } else {
            s5 = peg$FAILED;
            if (peg$silentFails === 0) { peg$fail(peg$e16); }
          }
          if (s5 === peg$FAILED) {
            if (input.charCodeAt(peg$currPos) === 45) {
              s5 = peg$c8;
              peg$currPos++;
            } else {
              s5 = peg$FAILED;
              if (peg$silentFails === 0) { peg$fail(peg$e17); }
            }
          }
          if (s5 !== peg$FAILED) {
            s6 = peg$parseMultiplyDivide();
            if (s6 !== peg$FAILED) {
              s5 = [s5, s6];
              s4 = s5;
            } else {
              peg$currPos = s4;
              s4 = peg$FAILED;
            }
          } else {
            peg$currPos = s4;
            s4 = peg$FAILED;
          }
        }
      } else {
        s3 = peg$FAILED;
      }
      if (s3 !== peg$FAILED) {
        s4 = peg$parse_();
        peg$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$parseMultiplyDivide() {
    var s0, s1, s2, s3, s4, s5, s6;

    s0 = peg$currPos;
    s1 = peg$parse_();
    s2 = peg$parseFactor();
    if (s2 !== peg$FAILED) {
      s3 = [];
      s4 = peg$currPos;
      if (input.charCodeAt(peg$currPos) === 42) {
        s5 = peg$c9;
        peg$currPos++;
      } else {
        s5 = peg$FAILED;
        if (peg$silentFails === 0) { peg$fail(peg$e18); }
      }
      if (s5 === peg$FAILED) {
        if (input.charCodeAt(peg$currPos) === 47) {
          s5 = peg$c10;
          peg$currPos++;
        } else {
          s5 = peg$FAILED;
          if (peg$silentFails === 0) { peg$fail(peg$e19); }
        }
      }
      if (s5 !== peg$FAILED) {
        s6 = peg$parseFactor();
        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) === 42) {
          s5 = peg$c9;
          peg$currPos++;
        } else {
          s5 = peg$FAILED;
          if (peg$silentFails === 0) { peg$fail(peg$e18); }
        }
        if (s5 === peg$FAILED) {
          if (input.charCodeAt(peg$currPos) === 47) {
            s5 = peg$c10;
            peg$currPos++;
          } else {
            s5 = peg$FAILED;
            if (peg$silentFails === 0) { peg$fail(peg$e19); }
          }
        }
        if (s5 !== peg$FAILED) {
          s6 = peg$parseFactor();
          if (s6 !== peg$FAILED) {
            s5 = [s5, s6];
            s4 = s5;
          } else {
            peg$currPos = s4;
            s4 = peg$FAILED;
          }
        } else {
          peg$currPos = s4;
          s4 = peg$FAILED;
        }
      }
      s4 = peg$parse_();
      peg$savedPos = s0;
      s0 = peg$f8(s2, s3);
    } else {
      peg$currPos = s0;
      s0 = peg$FAILED;
    }

    return s0;
  }

  function peg$parseFactor() {
    var s0;

    s0 = peg$parseGroup();
    if (s0 === peg$FAILED) {
      s0 = peg$parseFunction();
      if (s0 === peg$FAILED) {
        s0 = peg$parseLiteral();
      }
    }

    return s0;
  }

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

    s0 = peg$currPos;
    s1 = peg$parse_();
    if (input.charCodeAt(peg$currPos) === 40) {
      s2 = peg$c11;
      peg$currPos++;
    } else {
      s2 = peg$FAILED;
      if (peg$silentFails === 0) { peg$fail(peg$e20); }
    }
    if (s2 !== peg$FAILED) {
      s3 = peg$parse_();
      s4 = peg$parseMathOperation();
      if (s4 !== peg$FAILED) {
        s5 = peg$parse_();
        if (input.charCodeAt(peg$currPos) === 41) {
          s6 = peg$c12;
          peg$currPos++;
        } else {
          s6 = peg$FAILED;
          if (peg$silentFails === 0) { peg$fail(peg$e21); }
        }
        if (s6 !== peg$FAILED) {
          s7 = peg$parse_();
          peg$savedPos = s0;
          s0 = peg$f9(s4);
        } else {
          peg$currPos = s0;
          s0 = peg$FAILED;
        }
      } else {
        peg$currPos = s0;
        s0 = peg$FAILED;
      }
    } else {
      peg$currPos = s0;
      s0 = peg$FAILED;
    }

    return s0;
  }

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

    s0 = peg$currPos;
    s1 = peg$parse_();
    if (input.charCodeAt(peg$currPos) === 40) {
      s2 = peg$c11;
      peg$currPos++;
    } else {
      s2 = peg$FAILED;
      if (peg$silentFails === 0) { peg$fail(peg$e20); }
    }
    if (s2 !== peg$FAILED) {
      s3 = peg$parse_();
      s4 = peg$parseExpression();
      if (s4 !== peg$FAILED) {
        s5 = peg$parse_();
        if (input.charCodeAt(peg$currPos) === 41) {
          s6 = peg$c12;
          peg$currPos++;
        } else {
          s6 = peg$FAILED;
          if (peg$silentFails === 0) { peg$fail(peg$e21); }
        }
        if (s6 !== peg$FAILED) {
          s7 = peg$parse_();
          peg$savedPos = s0;
          s0 = peg$f9(s4);
        } else {
          peg$currPos = s0;
          s0 = peg$FAILED;
        }
      } else {
        peg$currPos = s0;
        s0 = peg$FAILED;
      }
    } else {
      peg$currPos = s0;
      s0 = peg$FAILED;
    }

    return s0;
  }

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

    peg$silentFails++;
    s0 = peg$currPos;
    s1 = peg$parseArgument();
    if (s1 !== peg$FAILED) {
      s2 = [];
      s3 = peg$currPos;
      s4 = peg$parse_();
      if (input.charCodeAt(peg$currPos) === 44) {
        s5 = peg$c13;
        peg$currPos++;
      } else {
        s5 = peg$FAILED;
        if (peg$silentFails === 0) { peg$fail(peg$e23); }
      }
      if (s5 !== peg$FAILED) {
        s6 = peg$parse_();
        s7 = peg$parseArgument();
        if (s7 !== peg$FAILED) {
          peg$savedPos = s3;
          s3 = peg$f10(s1, s7);
        } else {
          peg$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$currPos) === 44) {
          s5 = peg$c13;
          peg$currPos++;
        } else {
          s5 = peg$FAILED;
          if (peg$silentFails === 0) { peg$fail(peg$e23); }
        }
        if (s5 !== peg$FAILED) {
          s6 = peg$parse_();
          s7 = peg$parseArgument();
          if (s7 !== peg$FAILED) {
            peg$savedPos = s3;
            s3 = peg$f10(s1, s7);
          } else {
            peg$currPos = s3;
            s3 = peg$FAILED;
          }
        } else {
          peg$currPos = s3;
          s3 = peg$FAILED;
        }
      }
      s3 = peg$parse_();
      if (input.charCodeAt(peg$currPos) === 44) {
        s4 = peg$c13;
        peg$currPos++;
      } else {
        s4 = peg$FAILED;
        if (peg$silentFails === 0) { peg$fail(peg$e23); }
      }
      if (s4 === peg$FAILED) {
        s4 = null;
      }
      peg$savedPos = s0;
      s0 = peg$f11(s1, s2);
    } else {
      peg$currPos = s0;
      s0 = peg$FAILED;
    }
    peg$silentFails--;
    if (s0 === peg$FAILED) {
      s1 = peg$FAILED;
      if (peg$silentFails === 0) { peg$fail(peg$e22); }
    }

    return s0;
  }

  function peg$parseString() {
    var s0, s1, s2, s3, s4;

    s0 = peg$currPos;
    if (input.charCodeAt(peg$currPos) === 34) {
      s1 = peg$c0;
      peg$currPos++;
    } else {
      s1 = peg$FAILED;
      if (peg$silentFails === 0) { peg$fail(peg$e7); }
    }
    if (s1 !== peg$FAILED) {
      s2 = [];
      s3 = peg$currPos;
      if (input.substr(peg$currPos, 2) === peg$c1) {
        s4 = peg$c1;
        peg$currPos += 2;
      } else {
        s4 = peg$FAILED;
        if (peg$silentFails === 0) { peg$fail(peg$e8); }
      }
      if (s4 !== peg$FAILED) {
        peg$savedPos = s3;
        s4 = peg$f1();
      }
      s3 = s4;
      if (s3 === peg$FAILED) {
        if (peg$r5.test(input.charAt(peg$currPos))) {
          s3 = input.charAt(peg$currPos);
          peg$currPos++;
        } else {
          s3 = peg$FAILED;
          if (peg$silentFails === 0) { peg$fail(peg$e9); }
        }
      }
      while (s3 !== peg$FAILED) {
        s2.push(s3);
        s3 = peg$currPos;
        if (input.substr(peg$currPos, 2) === peg$c1) {
          s4 = peg$c1;
          peg$currPos += 2;
        } else {
          s4 = peg$FAILED;
          if (peg$silentFails === 0) { peg$fail(peg$e8); }
        }
        if (s4 !== peg$FAILED) {
          peg$savedPos = s3;
          s4 = peg$f1();
        }
        s3 = s4;
        if (s3 === peg$FAILED) {
          if (peg$r5.test(input.charAt(peg$currPos))) {
            s3 = input.charAt(peg$currPos);
            peg$currPos++;
          } else {
            s3 = peg$FAILED;
            if (peg$silentFails === 0) { peg$fail(peg$e9); }
          }
        }
      }
      if (input.charCodeAt(peg$currPos) === 34) {
        s3 = peg$c0;
        peg$currPos++;
      } else {
        s3 = peg$FAILED;
        if (peg$silentFails === 0) { peg$fail(peg$e7); }
      }
      if (s3 !== peg$FAILED) {
        peg$savedPos = s0;
        s0 = peg$f12(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$currPos) === 39) {
        s1 = peg$c2;
        peg$currPos++;
      } else {
        s1 = peg$FAILED;
        if (peg$silentFails === 0) { peg$fail(peg$e10); }
      }
      if (s1 !== peg$FAILED) {
        s2 = [];
        s3 = peg$currPos;
        if (input.substr(peg$currPos, 2) === peg$c3) {
          s4 = peg$c3;
          peg$currPos += 2;
        } else {
          s4 = peg$FAILED;
          if (peg$silentFails === 0) { peg$fail(peg$e11); }
        }
        if (s4 !== peg$FAILED) {
          peg$savedPos = s3;
          s4 = peg$f3();
        }
        s3 = s4;
        if (s3 === peg$FAILED) {
          if (peg$r6.test(input.charAt(peg$currPos))) {
            s3 = input.charAt(peg$currPos);
            peg$currPos++;
          } else {
            s3 = peg$FAILED;
            if (peg$silentFails === 0) { peg$fail(peg$e12); }
          }
        }
        while (s3 !== peg$FAILED) {
          s2.push(s3);
          s3 = peg$currPos;
          if (input.substr(peg$currPos, 2) === peg$c3) {
            s4 = peg$c3;
            peg$currPos += 2;
          } else {
            s4 = peg$FAILED;
            if (peg$silentFails === 0) { peg$fail(peg$e11); }
          }
          if (s4 !== peg$FAILED) {
            peg$savedPos = s3;
            s4 = peg$f3();
          }
          s3 = s4;
          if (s3 === peg$FAILED) {
            if (peg$r6.test(input.charAt(peg$currPos))) {
              s3 = input.charAt(peg$currPos);
              peg$currPos++;
            } else {
              s3 = peg$FAILED;
              if (peg$silentFails === 0) { peg$fail(peg$e12); }
            }
          }
        }
        if (input.charCodeAt(peg$currPos) === 39) {
          s3 = peg$c2;
          peg$currPos++;
        } else {
          s3 = peg$FAILED;
          if (peg$silentFails === 0) { peg$fail(peg$e10); }
        }
        if (s3 !== peg$FAILED) {
          peg$savedPos = s0;
          s0 = peg$f12(s2);
        } else {
          peg$currPos = s0;
          s0 = peg$FAILED;
        }
      } else {
        peg$currPos = s0;
        s0 = peg$FAILED;
      }
      if (s0 === peg$FAILED) {
        s0 = peg$currPos;
        s1 = [];
        s2 = peg$parseValidChar();
        if (s2 !== peg$FAILED) {
          while (s2 !== peg$FAILED) {
            s1.push(s2);
            s2 = peg$parseValidChar();
          }
        } else {
          s1 = peg$FAILED;
        }
        if (s1 !== peg$FAILED) {
          peg$savedPos = s0;
          s1 = peg$f12(s1);
        }
        s0 = s1;
      }
    }

    return s0;
  }

  function peg$parseArgument() {
    var s0, s1, s2, s3, s4, s5, s6;

    s0 = peg$currPos;
    s1 = [];
    if (peg$r7.test(input.charAt(peg$currPos))) {
      s2 = input.charAt(peg$currPos);
      peg$currPos++;
    } else {
      s2 = peg$FAILED;
      if (peg$silentFails === 0) { peg$fail(peg$e24); }
    }
    if (s2 !== peg$FAILED) {
      while (s2 !== peg$FAILED) {
        s1.push(s2);
        if (peg$r7.test(input.charAt(peg$currPos))) {
          s2 = input.charAt(peg$currPos);
          peg$currPos++;
        } else {
          s2 = peg$FAILED;
          if (peg$silentFails === 0) { peg$fail(peg$e24); }
        }
      }
    } else {
      s1 = peg$FAILED;
    }
    if (s1 !== peg$FAILED) {
      s2 = peg$parse_();
      if (input.charCodeAt(peg$currPos) === 61) {
        s3 = peg$c6;
        peg$currPos++;
      } else {
        s3 = peg$FAILED;
        if (peg$silentFails === 0) { peg$fail(peg$e15); }
      }
      if (s3 !== peg$FAILED) {
        s4 = peg$parse_();
        s5 = peg$parseNumber();
        if (s5 === peg$FAILED) {
          s5 = peg$parseString();
        }
        if (s5 !== peg$FAILED) {
          s6 = peg$parse_();
          peg$savedPos = s0;
          s0 = peg$f13(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$FAILED) {
      s0 = peg$parseExpression();
    }

    return s0;
  }

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

    peg$silentFails++;
    s0 = peg$currPos;
    s1 = peg$parse_();
    s2 = [];
    if (peg$r8.test(input.charAt(peg$currPos))) {
      s3 = input.charAt(peg$currPos);
      peg$currPos++;
    } else {
      s3 = peg$FAILED;
      if (peg$silentFails === 0) { peg$fail(peg$e26); }
    }
    if (s3 !== peg$FAILED) {
      while (s3 !== peg$FAILED) {
        s2.push(s3);
        if (peg$r8.test(input.charAt(peg$currPos))) {
          s3 = input.charAt(peg$currPos);
          peg$currPos++;
        } else {
          s3 = peg$FAILED;
          if (peg$silentFails === 0) { peg$fail(peg$e26); }
        }
      }
    } else {
      s2 = peg$FAILED;
    }
    if (s2 !== peg$FAILED) {
      if (input.charCodeAt(peg$currPos) === 40) {
        s3 = peg$c11;
        peg$currPos++;
      } else {
        s3 = peg$FAILED;
        if (peg$silentFails === 0) { peg$fail(peg$e20); }
      }
      if (s3 !== peg$FAILED) {
        s4 = peg$parse_();
        s5 = peg$parseArgument_List();
        if (s5 === peg$FAILED) {
          s5 = null;
        }
        s6 = peg$parse_();
        if (input.charCodeAt(peg$currPos) === 41) {
          s7 = peg$c12;
          peg$currPos++;
        } else {
          s7 = peg$FAILED;
          if (peg$silentFails === 0) { peg$fail(peg$e21); }
        }
        if (s7 !== peg$FAILED) {
          s8 = peg$parse_();
          peg$savedPos = s0;
          s0 = peg$f14(s2, s5);
        } else {
          peg$currPos = s0;
          s0 = peg$FAILED;
        }
      } else {
        peg$currPos = s0;
        s0 = peg$FAILED;
      }
    } else {
      peg$currPos = s0;
      s0 = peg$FAILED;
    }
    peg$silentFails--;
    if (s0 === peg$FAILED) {
      s1 = peg$FAILED;
      if (peg$silentFails === 0) { peg$fail(peg$e25); }
    }

    return s0;
  }

  function peg$parseNumber() {
    var s0, s1, s2, s3, s4;

    peg$silentFails++;
    s0 = peg$currPos;
    if (input.charCodeAt(peg$currPos) === 45) {
      s1 = peg$c8;
      peg$currPos++;
    } else {
      s1 = peg$FAILED;
      if (peg$silentFails === 0) { peg$fail(peg$e17); }
    }
    if (s1 === peg$FAILED) {
      s1 = null;
    }
    s2 = peg$parseInteger();
    if (s2 !== peg$FAILED) {
      s3 = peg$parseFraction();
      if (s3 === peg$FAILED) {
        s3 = null;
      }
      s4 = peg$parseExp();
      if (s4 === peg$FAILED) {
        s4 = null;
      }
      peg$savedPos = s0;
      s0 = peg$f15();
    } else {
      peg$currPos = s0;
      s0 = peg$FAILED;
    }
    peg$silentFails--;
    if (s0 === peg$FAILED) {
      s1 = peg$FAILED;
      if (peg$silentFails === 0) { peg$fail(peg$e27); }
    }

    return s0;
  }

  function peg$parseE() {
    var s0;

    if (peg$r9.test(input.charAt(peg$currPos))) {
      s0 = input.charAt(peg$currPos);
      peg$currPos++;
    } else {
      s0 = peg$FAILED;
      if (peg$silentFails === 0) { peg$fail(peg$e28); }
    }

    return s0;
  }

  function peg$parseExp() {
    var s0, s1, s2, s3, s4;

    peg$silentFails++;
    s0 = peg$currPos;
    s1 = peg$parseE();
    if (s1 !== peg$FAILED) {
      if (input.charCodeAt(peg$currPos) === 45) {
        s2 = peg$c8;
        peg$currPos++;
      } else {
        s2 = peg$FAILED;
        if (peg$silentFails === 0) { peg$fail(peg$e17); }
      }
      if (s2 === peg$FAILED) {
        s2 = null;
      }
      s3 = [];
      s4 = peg$parseDigit();
      if (s4 !== peg$FAILED) {
        while (s4 !== peg$FAILED) {
          s3.push(s4);
          s4 = peg$parseDigit();
        }
      } else {
        s3 = peg$FAILED;
      }
      if (s3 !== peg$FAILED) {
        s1 = [s1, s2, s3];
        s0 = s1;
      } else {
        peg$currPos = s0;
        s0 = peg$FAILED;
      }
    } else {
      peg$currPos = s0;
      s0 = peg$FAILED;
    }
    peg$silentFails--;
    if (s0 === peg$FAILED) {
      s1 = peg$FAILED;
      if (peg$silentFails === 0) { peg$fail(peg$e29); }
    }

    return s0;
  }

  function peg$parseFraction() {
    var s0, s1, s2, s3;

    s0 = peg$currPos;
    if (input.charCodeAt(peg$currPos) === 46) {
      s1 = peg$c14;
      peg$currPos++;
    } else {
      s1 = peg$FAILED;
      if (peg$silentFails === 0) { peg$fail(peg$e30); }
    }
    if (s1 !== peg$FAILED) {
      s2 = [];
      s3 = peg$parseDigit();
      if (s3 !== peg$FAILED) {
        while (s3 !== peg$FAILED) {
          s2.push(s3);
          s3 = peg$parseDigit();
        }
      } else {
        s2 = peg$FAILED;
      }
      if (s2 !== peg$FAILED) {
        s1 = [s1, s2];
        s0 = s1;
      } else {
        peg$currPos = s0;
        s0 = peg$FAILED;
      }
    } else {
      peg$currPos = s0;
      s0 = peg$FAILED;
    }

    return s0;
  }

  function peg$parseInteger() {
    var s0, s1, s2, s3;

    if (input.charCodeAt(peg$currPos) === 48) {
      s0 = peg$c15;
      peg$currPos++;
    } else {
      s0 = peg$FAILED;
      if (peg$silentFails === 0) { peg$fail(peg$e31); }
    }
    if (s0 === peg$FAILED) {
      s0 = peg$currPos;
      if (peg$r10.test(input.charAt(peg$currPos))) {
        s1 = input.charAt(peg$currPos);
        peg$currPos++;
      } else {
        s1 = peg$FAILED;
        if (peg$silentFails === 0) { peg$fail(peg$e32); }
      }
      if (s1 !== peg$FAILED) {
        s2 = [];
        s3 = peg$parseDigit();
        while (s3 !== peg$FAILED) {
          s2.push(s3);
          s3 = peg$parseDigit();
        }
        s1 = [s1, s2];
        s0 = s1;
      } else {
        peg$currPos = s0;
        s0 = peg$FAILED;
      }
    }

    return s0;
  }

  function peg$parseDigit() {
    var s0;

    if (peg$r11.test(input.charAt(peg$currPos))) {
      s0 = input.charAt(peg$currPos);
      peg$currPos++;
    } else {
      s0 = peg$FAILED;
      if (peg$silentFails === 0) { peg$fail(peg$e33); }
    }

    return s0;
  }


    function simpleLocation (location) {
      // Returns an object representing the position of the function within the expression,
      // demarcated by the position of its first character and last character. We calculate these values
      // using the offset because the expression could span multiple lines, and we don't want to deal
      // with column and line values.
      return {
        min: location.start.offset,
        max: location.end.offset
      }
    }

    const symbolsToFn = {
      '+': 'add', '-': 'subtract',
      '*': 'multiply', '/': 'divide',
      '<': 'lt', '>': 'gt', '==': 'eq',
      '<=': 'lte', '>=': 'gte',
    }

    // Shared function for AST operations
    function parseSymbol(left, rest){
      const topLevel = rest.reduce((acc, [name, right]) => ({
        type: 'function',
        name: symbolsToFn[name],
        args: [acc, right],
      }), left);
      if (typeof topLevel === 'object') {
        topLevel.location = simpleLocation(location());
        topLevel.text = text();
      }
      return topLevel;
    }
    
    // op is always defined, while eq can be null for gt and lt cases
    function getComparisonSymbol([op, eq]){
      return symbolsToFn[op+(eq || '')];
    }


  peg$result = peg$startRuleFunction();

  if (peg$result !== peg$FAILED && peg$currPos === input.length) {
    return peg$result;
  } else {
    if (peg$result !== peg$FAILED && peg$currPos < input.length) {
      peg$fail(peg$endExpectation());
    }

    throw peg$buildStructuredError(
      peg$maxFailExpected,
      peg$maxFailPos < input.length ? input.charAt(peg$maxFailPos) : null,
      peg$maxFailPos < input.length
        ? peg$computeLocation(peg$maxFailPos, peg$maxFailPos + 1)
        : peg$computeLocation(peg$maxFailPos, peg$maxFailPos)
    );
  }
}

module.exports = {
  SyntaxError: peg$SyntaxError,
  parse: peg$parse
};