pegjs-backtrace/test/test.js

A debug backtrace module for PEG.js.

// Generated by PEG.js v0.11.0-master.30f3260, https://pegjs.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) {
  this.message = message;
  this.expected = expected;
  this.found = found;
  this.location = location;
  this.name = "SyntaxError";

  // istanbul ignore next
  if (typeof Error.captureStackTrace === "function") {
    Error.captureStackTrace(this, peg$SyntaxError);
  }
}

peg$subclass(peg$SyntaxError, Error);

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;
    },

    not: function(expectation) {
      return "not " + describeExpectation(expectation.expected);
    }
  };

  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$DefaultTracer() {
  this.indentLevel = 0;
}

peg$DefaultTracer.prototype.trace = function(event) {
  var that = this;

  function log(event) {
    function repeat(string, n) {
       var result = "", i;

       for (i = 0; i < n; i++) {
         result += string;
       }

       return result;
    }

    function pad(string, length) {
      return string + repeat(" ", length - string.length);
    }

    if (typeof console === "object") {
      console.log(
        event.location.start.line + ":" + event.location.start.column + "-"
          + event.location.end.line + ":" + event.location.end.column + " "
          + pad(event.type, 10) + " "
          + repeat("  ", that.indentLevel) + event.rule
      );
    }
  }

  switch (event.type) {
    case "rule.enter":
      log(event);
      this.indentLevel++;
      break;

    case "rule.match":
      this.indentLevel--;
      log(event);
      break;

    case "rule.fail":
      this.indentLevel--;
      log(event);
      break;

    // istanbul ignore next
    default:
      throw new Error("Invalid event type: " + event.type + ".");
  }
};

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

  var peg$FAILED = {};

  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$r0 = /^[1-9]/;
  var peg$r1 = /^[0-9]/;

  var peg$e0 = peg$literalExpectation(" ", false);
  var peg$e1 = peg$literalExpectation("+", false);
  var peg$e2 = peg$literalExpectation("*", false);
  var peg$e3 = peg$literalExpectation("/", false);
  var peg$e4 = peg$literalExpectation("(", false);
  var peg$e5 = peg$literalExpectation(")", false);
  var peg$e6 = peg$classExpectation([["1", "9"]], false, false);
  var peg$e7 = peg$classExpectation([["0", "9"]], false, false);

  var peg$f0 = function(left, operator, right) { return { left, operator, right } };
  var peg$f1 = function(m) { return m };
  var peg$f2 = function(integer) { return { integer } };
  var peg$f3 = function(group) { return { group } };

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

  var peg$tracer = "tracer" in options ? options.tracer : new peg$DefaultTracer();

  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 [peg$savedPos, peg$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;
    }
  }

  var peg$VALIDFILENAME = typeof options.filename === "string" && options.filename.length > 0;
  function peg$computeLocation(startPos, endPos) {
    var loc = {};

    if ( peg$VALIDFILENAME ) loc.filename = options.filename;

    var startPosDetails = peg$computePosDetails(startPos);
    loc.start = {
      offset: startPos,
      line: startPosDetails.line,
      column: startPosDetails.column
    };

    var endPosDetails = peg$computePosDetails(endPos);
    loc.end = {
      offset: endPos,
      line: endPosDetails.line,
      column: endPosDetails.column
    };

    return loc;
  }

  function peg$begin() {
    peg$expected.push({ pos: peg$currPos, variants: [] });
  }

  function peg$expect(expected) {
    var top = peg$expected[peg$expected.length - 1];

    if (peg$currPos < top.pos) { return; }

    if (peg$currPos > top.pos) {
      top.pos = peg$currPos;
      top.variants = [];
    }

    top.variants.push(expected);
  }

  function peg$end(invert) {
    var expected = peg$expected.pop();
    var top = peg$expected[peg$expected.length - 1];
    var variants = expected.variants;

    if (top.pos !== expected.pos) { return; }

    if (invert) {
      variants = variants.map(function(e) {
        return e.type === "not" ? e.expected : { type: "not", expected: e };
      });
    }

    Array.prototype.push.apply(top.variants, variants);
  }

  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$buildError() {
    var expected = peg$expected[0];
    var failPos = expected.pos;

    return peg$buildStructuredError(
      expected.variants,
      failPos < input.length ? input.charAt(failPos) : null,
      failPos < input.length
        ? peg$computeLocation(failPos, failPos + 1)
        : peg$computeLocation(failPos, failPos)
    );
  }

  function peg$parsestart() {
    var startPos = peg$currPos;
    var s0;

    var rule$expects = function (expected) {
      if (peg$silentFails === 0) peg$expect(expected);
    }

    peg$tracer.trace({
      type: "rule.enter",
      rule: "start",
      location: peg$computeLocation(startPos, startPos)
    });

    s0 = peg$parseadditive();

    if (s0 !== peg$FAILED) {
      peg$tracer.trace({
        type: "rule.match",
        rule: "start",
        result: s0,
        location: peg$computeLocation(startPos, peg$currPos)
      });
    } else {
      peg$tracer.trace({
        type: "rule.fail",
        rule: "start",
        location: peg$computeLocation(startPos, startPos)
      });
    }

    return s0;
  }

  function peg$parsews() {
    var startPos = peg$currPos;
    var s0, s1;

    var rule$expects = function (expected) {
      if (peg$silentFails === 0) peg$expect(expected);
    }

    peg$tracer.trace({
      type: "rule.enter",
      rule: "ws",
      location: peg$computeLocation(startPos, startPos)
    });

    s0 = [];
    rule$expects(peg$e0);
    if (input.charCodeAt(peg$currPos) === 32) {
      s1 = peg$c0;
      peg$currPos++;
    } else {
      s1 = peg$FAILED;
    }
    while (s1 !== peg$FAILED) {
      s0.push(s1);
      rule$expects(peg$e0);
      if (input.charCodeAt(peg$currPos) === 32) {
        s1 = peg$c0;
        peg$currPos++;
      } else {
        s1 = peg$FAILED;
      }
    }

    if (s0 !== peg$FAILED) {
      peg$tracer.trace({
        type: "rule.match",
        rule: "ws",
        result: s0,
        location: peg$computeLocation(startPos, peg$currPos)
      });
    } else {
      peg$tracer.trace({
        type: "rule.fail",
        rule: "ws",
        location: peg$computeLocation(startPos, startPos)
      });
    }

    return s0;
  }

  function peg$parseplus() {
    var startPos = peg$currPos;
    var s0;

    var rule$expects = function (expected) {
      if (peg$silentFails === 0) peg$expect(expected);
    }

    peg$tracer.trace({
      type: "rule.enter",
      rule: "plus",
      location: peg$computeLocation(startPos, startPos)
    });

    rule$expects(peg$e1);
    if (input.charCodeAt(peg$currPos) === 43) {
      s0 = peg$c1;
      peg$currPos++;
    } else {
      s0 = peg$FAILED;
    }

    if (s0 !== peg$FAILED) {
      peg$tracer.trace({
        type: "rule.match",
        rule: "plus",
        result: s0,
        location: peg$computeLocation(startPos, peg$currPos)
      });
    } else {
      peg$tracer.trace({
        type: "rule.fail",
        rule: "plus",
        location: peg$computeLocation(startPos, startPos)
      });
    }

    return s0;
  }

  function peg$parsemult() {
    var startPos = peg$currPos;
    var s0;

    var rule$expects = function (expected) {
      if (peg$silentFails === 0) peg$expect(expected);
    }

    peg$tracer.trace({
      type: "rule.enter",
      rule: "mult",
      location: peg$computeLocation(startPos, startPos)
    });

    rule$expects(peg$e2);
    if (input.charCodeAt(peg$currPos) === 42) {
      s0 = peg$c2;
      peg$currPos++;
    } else {
      s0 = peg$FAILED;
    }

    if (s0 !== peg$FAILED) {
      peg$tracer.trace({
        type: "rule.match",
        rule: "mult",
        result: s0,
        location: peg$computeLocation(startPos, peg$currPos)
      });
    } else {
      peg$tracer.trace({
        type: "rule.fail",
        rule: "mult",
        location: peg$computeLocation(startPos, startPos)
      });
    }

    return s0;
  }

  function peg$parsediv() {
    var startPos = peg$currPos;
    var s0;

    var rule$expects = function (expected) {
      if (peg$silentFails === 0) peg$expect(expected);
    }

    peg$tracer.trace({
      type: "rule.enter",
      rule: "div",
      location: peg$computeLocation(startPos, startPos)
    });

    rule$expects(peg$e3);
    if (input.charCodeAt(peg$currPos) === 47) {
      s0 = peg$c3;
      peg$currPos++;
    } else {
      s0 = peg$FAILED;
    }

    if (s0 !== peg$FAILED) {
      peg$tracer.trace({
        type: "rule.match",
        rule: "div",
        result: s0,
        location: peg$computeLocation(startPos, peg$currPos)
      });
    } else {
      peg$tracer.trace({
        type: "rule.fail",
        rule: "div",
        location: peg$computeLocation(startPos, startPos)
      });
    }

    return s0;
  }

  function peg$parseleft_parens() {
    var startPos = peg$currPos;
    var s0;

    var rule$expects = function (expected) {
      if (peg$silentFails === 0) peg$expect(expected);
    }

    peg$tracer.trace({
      type: "rule.enter",
      rule: "left_parens",
      location: peg$computeLocation(startPos, startPos)
    });

    rule$expects(peg$e4);
    if (input.charCodeAt(peg$currPos) === 40) {
      s0 = peg$c4;
      peg$currPos++;
    } else {
      s0 = peg$FAILED;
    }

    if (s0 !== peg$FAILED) {
      peg$tracer.trace({
        type: "rule.match",
        rule: "left_parens",
        result: s0,
        location: peg$computeLocation(startPos, peg$currPos)
      });
    } else {
      peg$tracer.trace({
        type: "rule.fail",
        rule: "left_parens",
        location: peg$computeLocation(startPos, startPos)
      });
    }

    return s0;
  }

  function peg$parseright_parens() {
    var startPos = peg$currPos;
    var s0;

    var rule$expects = function (expected) {
      if (peg$silentFails === 0) peg$expect(expected);
    }

    peg$tracer.trace({
      type: "rule.enter",
      rule: "right_parens",
      location: peg$computeLocation(startPos, startPos)
    });

    rule$expects(peg$e5);
    if (input.charCodeAt(peg$currPos) === 41) {
      s0 = peg$c5;
      peg$currPos++;
    } else {
      s0 = peg$FAILED;
    }

    if (s0 !== peg$FAILED) {
      peg$tracer.trace({
        type: "rule.match",
        rule: "right_parens",
        result: s0,
        location: peg$computeLocation(startPos, peg$currPos)
      });
    } else {
      peg$tracer.trace({
        type: "rule.fail",
        rule: "right_parens",
        location: peg$computeLocation(startPos, startPos)
      });
    }

    return s0;
  }

  function peg$parseinteger() {
    var startPos = peg$currPos;
    var s0, s1, s2, s3, s4;

    var rule$expects = function (expected) {
      if (peg$silentFails === 0) peg$expect(expected);
    }

    peg$tracer.trace({
      type: "rule.enter",
      rule: "integer",
      location: peg$computeLocation(startPos, startPos)
    });

    s0 = peg$currPos;
    s1 = peg$currPos;
    rule$expects(peg$e6);
    if (peg$r0.test(input.charAt(peg$currPos))) {
      s2 = input.charAt(peg$currPos);
      peg$currPos++;
    } else {
      s2 = peg$FAILED;
    }
    if (s2 !== peg$FAILED) {
      s3 = [];
      rule$expects(peg$e7);
      if (peg$r1.test(input.charAt(peg$currPos))) {
        s4 = input.charAt(peg$currPos);
        peg$currPos++;
      } else {
        s4 = peg$FAILED;
      }
      while (s4 !== peg$FAILED) {
        s3.push(s4);
        rule$expects(peg$e7);
        if (peg$r1.test(input.charAt(peg$currPos))) {
          s4 = input.charAt(peg$currPos);
          peg$currPos++;
        } else {
          s4 = peg$FAILED;
        }
      }
      s2 = [s2, s3];
      s1 = s2;
    } else {
      peg$currPos = s1;
      s1 = peg$FAILED;
    }
    if (s1 !== peg$FAILED) {
      s0 = input.substring(s0, peg$currPos);
    } else {
      s0 = s1;
    }

    if (s0 !== peg$FAILED) {
      peg$tracer.trace({
        type: "rule.match",
        rule: "integer",
        result: s0,
        location: peg$computeLocation(startPos, peg$currPos)
      });
    } else {
      peg$tracer.trace({
        type: "rule.fail",
        rule: "integer",
        location: peg$computeLocation(startPos, startPos)
      });
    }

    return s0;
  }

  function peg$parseadditive() {
    var startPos = peg$currPos;
    var s0, s1, s2, s3, s4, s5, s6;

    var rule$expects = function (expected) {
      if (peg$silentFails === 0) peg$expect(expected);
    }

    peg$tracer.trace({
      type: "rule.enter",
      rule: "additive",
      location: peg$computeLocation(startPos, startPos)
    });

    s0 = peg$currPos;
    s1 = peg$parsews();
    s2 = peg$parsemultiplicative();
    if (s2 !== peg$FAILED) {
      s3 = peg$parsews();
      s4 = peg$parseplus();
      if (s4 !== peg$FAILED) {
        s5 = peg$parsews();
        s6 = peg$parseadditive();
        if (s6 !== peg$FAILED) {
          peg$savedPos = s0;
          s0 = peg$f0(s2, s4, s6);
        } else {
          peg$currPos = s0;
          s0 = peg$FAILED;
        }
      } else {
        peg$currPos = s0;
        s0 = peg$FAILED;
      }
    } else {
      peg$currPos = s0;
      s0 = peg$FAILED;
    }
    if (s0 === peg$FAILED) {
      s0 = peg$currPos;
      s1 = peg$parsews();
      s2 = peg$parsemultiplicative();
      if (s2 !== peg$FAILED) {
        s3 = peg$parsews();
        peg$savedPos = s0;
        s0 = peg$f1(s2);
      } else {
        peg$currPos = s0;
        s0 = peg$FAILED;
      }
    }

    if (s0 !== peg$FAILED) {
      peg$tracer.trace({
        type: "rule.match",
        rule: "additive",
        result: s0,
        location: peg$computeLocation(startPos, peg$currPos)
      });
    } else {
      peg$tracer.trace({
        type: "rule.fail",
        rule: "additive",
        location: peg$computeLocation(startPos, startPos)
      });
    }

    return s0;
  }

  function peg$parsemultiplicative() {
    var startPos = peg$currPos;
    var s0, s1, s2, s3, s4, s5, s6;

    var rule$expects = function (expected) {
      if (peg$silentFails === 0) peg$expect(expected);
    }

    peg$tracer.trace({
      type: "rule.enter",
      rule: "multiplicative",
      location: peg$computeLocation(startPos, startPos)
    });

    s0 = peg$currPos;
    s1 = peg$parsews();
    s2 = peg$parsedivisive();
    if (s2 !== peg$FAILED) {
      s3 = peg$parsews();
      s4 = peg$parsemult();
      if (s4 !== peg$FAILED) {
        s5 = peg$parsews();
        s6 = peg$parsemultiplicative();
        if (s6 !== peg$FAILED) {
          peg$savedPos = s0;
          s0 = peg$f0(s2, s4, s6);
        } else {
          peg$currPos = s0;
          s0 = peg$FAILED;
        }
      } else {
        peg$currPos = s0;
        s0 = peg$FAILED;
      }
    } else {
      peg$currPos = s0;
      s0 = peg$FAILED;
    }
    if (s0 === peg$FAILED) {
      s0 = peg$currPos;
      s1 = peg$parsews();
      s2 = peg$parsedivisive();
      if (s2 !== peg$FAILED) {
        s3 = peg$parsews();
        peg$savedPos = s0;
        s0 = peg$f1(s2);
      } else {
        peg$currPos = s0;
        s0 = peg$FAILED;
      }
    }

    if (s0 !== peg$FAILED) {
      peg$tracer.trace({
        type: "rule.match",
        rule: "multiplicative",
        result: s0,
        location: peg$computeLocation(startPos, peg$currPos)
      });
    } else {
      peg$tracer.trace({
        type: "rule.fail",
        rule: "multiplicative",
        location: peg$computeLocation(startPos, startPos)
      });
    }

    return s0;
  }

  function peg$parsedivisive() {
    var startPos = peg$currPos;
    var s0, s1, s2, s3, s4, s5, s6, s7;

    var rule$expects = function (expected) {
      if (peg$silentFails === 0) peg$expect(expected);
    }

    peg$tracer.trace({
      type: "rule.enter",
      rule: "divisive",
      location: peg$computeLocation(startPos, startPos)
    });

    s0 = peg$currPos;
    s1 = peg$parsews();
    s2 = peg$parseprimary();
    if (s2 !== peg$FAILED) {
      s3 = peg$parsews();
      s4 = peg$parsediv();
      if (s4 !== peg$FAILED) {
        s5 = peg$parsews();
        s6 = peg$parsedivisive();
        if (s6 !== peg$FAILED) {
          s7 = peg$parsews();
          peg$savedPos = s0;
          s0 = peg$f0(s2, s4, s6);
        } else {
          peg$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$currPos;
      s1 = peg$parsews();
      s2 = peg$parseprimary();
      if (s2 !== peg$FAILED) {
        s3 = peg$parsews();
        peg$savedPos = s0;
        s0 = peg$f1(s2);
      } else {
        peg$currPos = s0;
        s0 = peg$FAILED;
      }
    }

    if (s0 !== peg$FAILED) {
      peg$tracer.trace({
        type: "rule.match",
        rule: "divisive",
        result: s0,
        location: peg$computeLocation(startPos, peg$currPos)
      });
    } else {
      peg$tracer.trace({
        type: "rule.fail",
        rule: "divisive",
        location: peg$computeLocation(startPos, startPos)
      });
    }

    return s0;
  }

  function peg$parseprimary() {
    var startPos = peg$currPos;
    var s0, s1, s2, s3, s4, s5, s6, s7;

    var rule$expects = function (expected) {
      if (peg$silentFails === 0) peg$expect(expected);
    }

    peg$tracer.trace({
      type: "rule.enter",
      rule: "primary",
      location: peg$computeLocation(startPos, startPos)
    });

    s0 = peg$currPos;
    s1 = peg$parsews();
    s2 = peg$parseinteger();
    if (s2 !== peg$FAILED) {
      s3 = peg$parsews();
      peg$savedPos = s0;
      s0 = peg$f2(s2);
    } else {
      peg$currPos = s0;
      s0 = peg$FAILED;
    }
    if (s0 === peg$FAILED) {
      s0 = peg$currPos;
      s1 = peg$parsews();
      s2 = peg$parseleft_parens();
      if (s2 !== peg$FAILED) {
        s3 = peg$parsews();
        s4 = peg$parseadditive();
        if (s4 !== peg$FAILED) {
          s5 = peg$parsews();
          s6 = peg$parseright_parens();
          if (s6 !== peg$FAILED) {
            s7 = peg$parsews();
            peg$savedPos = s0;
            s0 = peg$f3(s4);
          } else {
            peg$currPos = s0;
            s0 = peg$FAILED;
          }
        } else {
          peg$currPos = s0;
          s0 = peg$FAILED;
        }
      } else {
        peg$currPos = s0;
        s0 = peg$FAILED;
      }
    }

    if (s0 !== peg$FAILED) {
      peg$tracer.trace({
        type: "rule.match",
        rule: "primary",
        result: s0,
        location: peg$computeLocation(startPos, peg$currPos)
      });
    } else {
      peg$tracer.trace({
        type: "rule.fail",
        rule: "primary",
        location: peg$computeLocation(startPos, startPos)
      });
    }

    return s0;
  }

  peg$begin();
  peg$result = peg$startRuleFunction();

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

    throw peg$buildError();
  }
}

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