X-Git-Url: http://git.squeep.com/?p=squeep-web-linking;a=blobdiff_plain;f=lib%2Frfc8288-web-linking.js;fp=lib%2Frfc8288-web-linking.js;h=3c41f32180e81a35a7ff0bed74f787d29336af33;hp=0000000000000000000000000000000000000000;hb=3436c07c25324507228f3d538d345ea35751c623;hpb=b36198e0a3d21413d75a501ffd52f0fb20188a31

diff --git a/lib/rfc8288-web-linking.js b/lib/rfc8288-web-linking.js
new file mode 100644
index 0000000..3c41f32
--- /dev/null
+++ b/lib/rfc8288-web-linking.js
@@ -0,0 +1,1070 @@
+// Generated by Peggy 1.2.0.
+//
+// https://peggyjs.org/
+
+"use strict";
+
+
+/* Generated code is not pretty, ignore a lot of this horrorstyle. */
+/* eslint-disable quotes */
+/* eslint-disable vars-on-top */
+/* eslint-disable no-control-regex */
+/* eslint-disable security/detect-object-injection */
+/* eslint-disable vars-on-top */
+/* eslint-disable brace-style */
+/* eslint-disable comma-dangle */
+/* eslint-disable no-unused-vars */
+
+function makeString(o) {
+  return o.join('');
+}
+
+const onlyFirstAttributes = [
+  'media',
+  'rel',
+  'title',
+  'title*',
+  'type',
+];
+
+
+
+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 = { links: peg$parselinks, extendedValue: peg$parseextendedValue };
+  var peg$startRuleFunction = peg$parselinks;
+
+  var peg$c0 = ",";
+  var peg$c1 = "<";
+  var peg$c2 = ">";
+  var peg$c3 = ";";
+  var peg$c4 = "=";
+  var peg$c5 = "*";
+
+  var peg$r0 = /^[^>]/;
+  var peg$r1 = /^[a-zA-Z]/;
+  var peg$r2 = /^["]/;
+  var peg$r3 = /^[^"]/;
+  var peg$r4 = /^[^";,]/;
+  var peg$r5 = /^[ ]/;
+  var peg$r6 = /^[^']/;
+  var peg$r7 = /^[']/;
+
+  var peg$e0 = peg$otherExpectation("links");
+  var peg$e1 = peg$otherExpectation("link-value");
+  var peg$e2 = peg$literalExpectation(",", false);
+  var peg$e3 = peg$otherExpectation("uri-reference");
+  var peg$e4 = peg$literalExpectation("<", false);
+  var peg$e5 = peg$literalExpectation(">", false);
+  var peg$e6 = peg$literalExpectation(";", false);
+  var peg$e7 = peg$otherExpectation("uri");
+  var peg$e8 = peg$classExpectation([">"], true, false);
+  var peg$e9 = peg$otherExpectation("attributes");
+  var peg$e10 = peg$otherExpectation("link-param");
+  var peg$e11 = peg$literalExpectation("=", false);
+  var peg$e12 = peg$otherExpectation("name");
+  var peg$e13 = peg$classExpectation([["a", "z"], ["A", "Z"]], false, false);
+  var peg$e14 = peg$literalExpectation("*", false);
+  var peg$e15 = peg$otherExpectation("value");
+  var peg$e16 = peg$classExpectation(["\""], false, false);
+  var peg$e17 = peg$classExpectation(["\""], true, false);
+  var peg$e18 = peg$classExpectation(["\"", ";", ","], true, false);
+  var peg$e19 = peg$otherExpectation("whitespace");
+  var peg$e20 = peg$classExpectation([" "], false, false);
+  var peg$e21 = peg$otherExpectation("bad whitespace");
+  var peg$e22 = peg$otherExpectation("extended-value");
+  var peg$e23 = peg$classExpectation(["'"], true, false);
+  var peg$e24 = peg$classExpectation(["'"], false, false);
+  var peg$e25 = peg$anyExpectation();
+
+  var peg$f0 = function(links) {
+      return links;
+    };
+  var peg$f1 = function(uriReference, attributes) {
+      seenAttributes = [];
+      return {
+        target: uriReference,
+        attributes,
+      };
+    };
+  var peg$f2 = function(uri) { 
+      return uri;
+    };
+  var peg$f3 = function(uri) {
+      return makeString(uri);
+    };
+  var peg$f4 = function(attrs) {
+      return attrs.filter((a) => a);
+    };
+  var peg$f5 = function(name, value) {
+      if (onlyFirstAttributes.includes(name.name)) {
+        if (seenAttributes.includes(name.name)) {
+          // Repeat of singleton attribute, ignore it.
+          return;
+        }
+        seenAttributes.push(name.name);
+      }
+      return {
+        ...name,
+        ...value,
+      };
+    };
+  var peg$f6 = function(name) {
+      return {
+        ...name,
+        value: null,
+      }
+    };
+  var peg$f7 = function(name, extended) {
+      return {
+        name: makeString(name.concat(extended)).toLowerCase(),
+        extended: !!extended,
+      };
+    };
+  var peg$f8 = function(value) {
+      return {
+        value: makeString(value),
+      };
+    };
+  var peg$f9 = function(encoding, language, value) {
+      return {
+        encoding: encoding.length ? makeString(encoding) : 'UTF-8',
+        language: language.length ? makeString(language) : null,
+        value: decodeURIComponent(makeString(value)),
+      };
+    };
+  var peg$f10 = function(value) {
+      return {
+        encoding: null,
+        language: null,
+        value: makeString(value),
+      };
+    };
+
+  var peg$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$SyntaxError.buildMessage(expected, found),
+      expected,
+      found,
+      location
+    );
+  }
+
+  function peg$parselinks() {
+    var s0, s1, s2;
+
+    peg$silentFails++;
+    s0 = peg$currPos;
+    s1 = [];
+    s2 = peg$parselinkValue();
+    if (s2 !== peg$FAILED) {
+      while (s2 !== peg$FAILED) {
+        s1.push(s2);
+        s2 = peg$parselinkValue();
+      }
+    } else {
+      s1 = peg$FAILED;
+    }
+    if (s1 !== peg$FAILED) {
+      peg$savedPos = s0;
+      s1 = peg$f0(s1);
+    }
+    s0 = s1;
+    peg$silentFails--;
+    if (s0 === peg$FAILED) {
+      s1 = peg$FAILED;
+      if (peg$silentFails === 0) { peg$fail(peg$e0); }
+    }
+
+    return s0;
+  }
+
+  function peg$parselinkValue() {
+    var s0, s1, s2, s3, s4, s5;
+
+    peg$silentFails++;
+    s0 = peg$currPos;
+    s1 = peg$parseuriReference();
+    if (s1 !== peg$FAILED) {
+      s2 = peg$parseOWS();
+      s3 = peg$parseattributes();
+      if (s3 !== peg$FAILED) {
+        if (input.charCodeAt(peg$currPos) === 44) {
+          s4 = peg$c0;
+          peg$currPos++;
+        } else {
+          s4 = peg$FAILED;
+          if (peg$silentFails === 0) { peg$fail(peg$e2); }
+        }
+        if (s4 === peg$FAILED) {
+          s4 = null;
+        }
+        s5 = peg$parseOWS();
+        peg$savedPos = s0;
+        s0 = peg$f1(s1, s3);
+      } else {
+        peg$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$e1); }
+    }
+
+    return s0;
+  }
+
+  function peg$parseuriReference() {
+    var s0, s1, s2, s3, s4;
+
+    peg$silentFails++;
+    s0 = peg$currPos;
+    if (input.charCodeAt(peg$currPos) === 60) {
+      s1 = peg$c1;
+      peg$currPos++;
+    } else {
+      s1 = peg$FAILED;
+      if (peg$silentFails === 0) { peg$fail(peg$e4); }
+    }
+    if (s1 !== peg$FAILED) {
+      s2 = peg$parseuri();
+      if (s2 !== peg$FAILED) {
+        if (input.charCodeAt(peg$currPos) === 62) {
+          s3 = peg$c2;
+          peg$currPos++;
+        } else {
+          s3 = peg$FAILED;
+          if (peg$silentFails === 0) { peg$fail(peg$e5); }
+        }
+        if (s3 !== peg$FAILED) {
+          if (input.charCodeAt(peg$currPos) === 59) {
+            s4 = peg$c3;
+            peg$currPos++;
+          } else {
+            s4 = peg$FAILED;
+            if (peg$silentFails === 0) { peg$fail(peg$e6); }
+          }
+          if (s4 !== peg$FAILED) {
+            peg$savedPos = s0;
+            s0 = peg$f2(s2);
+          } 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;
+    }
+    peg$silentFails--;
+    if (s0 === peg$FAILED) {
+      s1 = peg$FAILED;
+      if (peg$silentFails === 0) { peg$fail(peg$e3); }
+    }
+
+    return s0;
+  }
+
+  function peg$parseuri() {
+    var s0, s1, s2;
+
+    peg$silentFails++;
+    s0 = peg$currPos;
+    s1 = [];
+    if (peg$r0.test(input.charAt(peg$currPos))) {
+      s2 = input.charAt(peg$currPos);
+      peg$currPos++;
+    } else {
+      s2 = peg$FAILED;
+      if (peg$silentFails === 0) { peg$fail(peg$e8); }
+    }
+    if (s2 !== peg$FAILED) {
+      while (s2 !== peg$FAILED) {
+        s1.push(s2);
+        if (peg$r0.test(input.charAt(peg$currPos))) {
+          s2 = input.charAt(peg$currPos);
+          peg$currPos++;
+        } else {
+          s2 = peg$FAILED;
+          if (peg$silentFails === 0) { peg$fail(peg$e8); }
+        }
+      }
+    } else {
+      s1 = peg$FAILED;
+    }
+    if (s1 !== peg$FAILED) {
+      peg$savedPos = s0;
+      s1 = peg$f3(s1);
+    }
+    s0 = s1;
+    peg$silentFails--;
+    if (s0 === peg$FAILED) {
+      s1 = peg$FAILED;
+      if (peg$silentFails === 0) { peg$fail(peg$e7); }
+    }
+
+    return s0;
+  }
+
+  function peg$parseattributes() {
+    var s0, s1, s2;
+
+    peg$silentFails++;
+    s0 = peg$currPos;
+    s1 = [];
+    s2 = peg$parselinkParam();
+    if (s2 !== peg$FAILED) {
+      while (s2 !== peg$FAILED) {
+        s1.push(s2);
+        s2 = peg$parselinkParam();
+      }
+    } else {
+      s1 = peg$FAILED;
+    }
+    if (s1 !== peg$FAILED) {
+      peg$savedPos = s0;
+      s1 = peg$f4(s1);
+    }
+    s0 = s1;
+    peg$silentFails--;
+    if (s0 === peg$FAILED) {
+      s1 = peg$FAILED;
+      if (peg$silentFails === 0) { peg$fail(peg$e9); }
+    }
+
+    return s0;
+  }
+
+  function peg$parselinkParam() {
+    var s0, s1, s2, s3, s4, s5, s6, s7;
+
+    peg$silentFails++;
+    s0 = peg$currPos;
+    s1 = peg$parsename();
+    if (s1 !== peg$FAILED) {
+      s2 = peg$parseBWS();
+      if (input.charCodeAt(peg$currPos) === 61) {
+        s3 = peg$c4;
+        peg$currPos++;
+      } else {
+        s3 = peg$FAILED;
+        if (peg$silentFails === 0) { peg$fail(peg$e11); }
+      }
+      if (s3 !== peg$FAILED) {
+        s4 = peg$parseBWS();
+        s5 = peg$parsevalue();
+        if (s5 !== peg$FAILED) {
+          if (input.charCodeAt(peg$currPos) === 59) {
+            s6 = peg$c3;
+            peg$currPos++;
+          } else {
+            s6 = peg$FAILED;
+            if (peg$silentFails === 0) { peg$fail(peg$e6); }
+          }
+          if (s6 === peg$FAILED) {
+            s6 = null;
+          }
+          s7 = peg$parseOWS();
+          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;
+    }
+    if (s0 === peg$FAILED) {
+      s0 = peg$currPos;
+      s1 = peg$parsename();
+      if (s1 !== peg$FAILED) {
+        s2 = peg$parseBWS();
+        if (input.charCodeAt(peg$currPos) === 59) {
+          s3 = peg$c3;
+          peg$currPos++;
+        } else {
+          s3 = peg$FAILED;
+          if (peg$silentFails === 0) { peg$fail(peg$e6); }
+        }
+        if (s3 === peg$FAILED) {
+          s3 = null;
+        }
+        s4 = peg$parseOWS();
+        peg$savedPos = s0;
+        s0 = peg$f6(s1);
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+    }
+    peg$silentFails--;
+    if (s0 === peg$FAILED) {
+      s1 = peg$FAILED;
+      if (peg$silentFails === 0) { peg$fail(peg$e10); }
+    }
+
+    return s0;
+  }
+
+  function peg$parsename() {
+    var s0, s1, s2;
+
+    peg$silentFails++;
+    s0 = peg$currPos;
+    s1 = [];
+    if (peg$r1.test(input.charAt(peg$currPos))) {
+      s2 = input.charAt(peg$currPos);
+      peg$currPos++;
+    } else {
+      s2 = peg$FAILED;
+      if (peg$silentFails === 0) { peg$fail(peg$e13); }
+    }
+    if (s2 !== peg$FAILED) {
+      while (s2 !== peg$FAILED) {
+        s1.push(s2);
+        if (peg$r1.test(input.charAt(peg$currPos))) {
+          s2 = input.charAt(peg$currPos);
+          peg$currPos++;
+        } else {
+          s2 = peg$FAILED;
+          if (peg$silentFails === 0) { peg$fail(peg$e13); }
+        }
+      }
+    } else {
+      s1 = peg$FAILED;
+    }
+    if (s1 !== peg$FAILED) {
+      if (input.charCodeAt(peg$currPos) === 42) {
+        s2 = peg$c5;
+        peg$currPos++;
+      } else {
+        s2 = peg$FAILED;
+        if (peg$silentFails === 0) { peg$fail(peg$e14); }
+      }
+      if (s2 === peg$FAILED) {
+        s2 = null;
+      }
+      peg$savedPos = s0;
+      s0 = peg$f7(s1, s2);
+    } else {
+      peg$currPos = s0;
+      s0 = peg$FAILED;
+    }
+    peg$silentFails--;
+    if (s0 === peg$FAILED) {
+      s1 = peg$FAILED;
+      if (peg$silentFails === 0) { peg$fail(peg$e12); }
+    }
+
+    return s0;
+  }
+
+  function peg$parsevalue() {
+    var s0, s1, s2, s3;
+
+    peg$silentFails++;
+    s0 = peg$currPos;
+    if (peg$r2.test(input.charAt(peg$currPos))) {
+      s1 = input.charAt(peg$currPos);
+      peg$currPos++;
+    } else {
+      s1 = peg$FAILED;
+      if (peg$silentFails === 0) { peg$fail(peg$e16); }
+    }
+    if (s1 !== peg$FAILED) {
+      s2 = [];
+      if (peg$r3.test(input.charAt(peg$currPos))) {
+        s3 = input.charAt(peg$currPos);
+        peg$currPos++;
+      } else {
+        s3 = peg$FAILED;
+        if (peg$silentFails === 0) { peg$fail(peg$e17); }
+      }
+      if (s3 !== peg$FAILED) {
+        while (s3 !== peg$FAILED) {
+          s2.push(s3);
+          if (peg$r3.test(input.charAt(peg$currPos))) {
+            s3 = input.charAt(peg$currPos);
+            peg$currPos++;
+          } else {
+            s3 = peg$FAILED;
+            if (peg$silentFails === 0) { peg$fail(peg$e17); }
+          }
+        }
+      } else {
+        s2 = peg$FAILED;
+      }
+      if (s2 !== peg$FAILED) {
+        if (peg$r2.test(input.charAt(peg$currPos))) {
+          s3 = input.charAt(peg$currPos);
+          peg$currPos++;
+        } else {
+          s3 = peg$FAILED;
+          if (peg$silentFails === 0) { peg$fail(peg$e16); }
+        }
+        if (s3 !== peg$FAILED) {
+          peg$savedPos = s0;
+          s0 = peg$f8(s2);
+        } 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 = [];
+      if (peg$r4.test(input.charAt(peg$currPos))) {
+        s2 = input.charAt(peg$currPos);
+        peg$currPos++;
+      } else {
+        s2 = peg$FAILED;
+        if (peg$silentFails === 0) { peg$fail(peg$e18); }
+      }
+      if (s2 !== peg$FAILED) {
+        while (s2 !== peg$FAILED) {
+          s1.push(s2);
+          if (peg$r4.test(input.charAt(peg$currPos))) {
+            s2 = input.charAt(peg$currPos);
+            peg$currPos++;
+          } else {
+            s2 = peg$FAILED;
+            if (peg$silentFails === 0) { peg$fail(peg$e18); }
+          }
+        }
+      } else {
+        s1 = peg$FAILED;
+      }
+      if (s1 !== peg$FAILED) {
+        peg$savedPos = s0;
+        s1 = peg$f8(s1);
+      }
+      s0 = s1;
+    }
+    peg$silentFails--;
+    if (s0 === peg$FAILED) {
+      s1 = peg$FAILED;
+      if (peg$silentFails === 0) { peg$fail(peg$e15); }
+    }
+
+    return s0;
+  }
+
+  function peg$parseOWS() {
+    var s0, s1;
+
+    peg$silentFails++;
+    s0 = [];
+    if (peg$r5.test(input.charAt(peg$currPos))) {
+      s1 = input.charAt(peg$currPos);
+      peg$currPos++;
+    } else {
+      s1 = peg$FAILED;
+      if (peg$silentFails === 0) { peg$fail(peg$e20); }
+    }
+    while (s1 !== peg$FAILED) {
+      s0.push(s1);
+      if (peg$r5.test(input.charAt(peg$currPos))) {
+        s1 = input.charAt(peg$currPos);
+        peg$currPos++;
+      } else {
+        s1 = peg$FAILED;
+        if (peg$silentFails === 0) { peg$fail(peg$e20); }
+      }
+    }
+    peg$silentFails--;
+    s1 = peg$FAILED;
+    if (peg$silentFails === 0) { peg$fail(peg$e19); }
+
+    return s0;
+  }
+
+  function peg$parseBWS() {
+    var s0, s1;
+
+    peg$silentFails++;
+    s0 = peg$parseOWS();
+    peg$silentFails--;
+    s1 = peg$FAILED;
+    if (peg$silentFails === 0) { peg$fail(peg$e21); }
+
+    return s0;
+  }
+
+  function peg$parseextendedValue() {
+    var s0, s1, s2, s3, s4, s5, s6;
+
+    peg$silentFails++;
+    s0 = peg$currPos;
+    s1 = [];
+    if (peg$r6.test(input.charAt(peg$currPos))) {
+      s2 = input.charAt(peg$currPos);
+      peg$currPos++;
+    } else {
+      s2 = peg$FAILED;
+      if (peg$silentFails === 0) { peg$fail(peg$e23); }
+    }
+    while (s2 !== peg$FAILED) {
+      s1.push(s2);
+      if (peg$r6.test(input.charAt(peg$currPos))) {
+        s2 = input.charAt(peg$currPos);
+        peg$currPos++;
+      } else {
+        s2 = peg$FAILED;
+        if (peg$silentFails === 0) { peg$fail(peg$e23); }
+      }
+    }
+    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$FAILED) {
+      s3 = [];
+      if (peg$r6.test(input.charAt(peg$currPos))) {
+        s4 = input.charAt(peg$currPos);
+        peg$currPos++;
+      } else {
+        s4 = peg$FAILED;
+        if (peg$silentFails === 0) { peg$fail(peg$e23); }
+      }
+      while (s4 !== peg$FAILED) {
+        s3.push(s4);
+        if (peg$r6.test(input.charAt(peg$currPos))) {
+          s4 = input.charAt(peg$currPos);
+          peg$currPos++;
+        } else {
+          s4 = peg$FAILED;
+          if (peg$silentFails === 0) { peg$fail(peg$e23); }
+        }
+      }
+      if (peg$r7.test(input.charAt(peg$currPos))) {
+        s4 = input.charAt(peg$currPos);
+        peg$currPos++;
+      } else {
+        s4 = peg$FAILED;
+        if (peg$silentFails === 0) { peg$fail(peg$e24); }
+      }
+      if (s4 !== peg$FAILED) {
+        s5 = [];
+        if (input.length > peg$currPos) {
+          s6 = input.charAt(peg$currPos);
+          peg$currPos++;
+        } else {
+          s6 = peg$FAILED;
+          if (peg$silentFails === 0) { peg$fail(peg$e25); }
+        }
+        while (s6 !== peg$FAILED) {
+          s5.push(s6);
+          if (input.length > peg$currPos) {
+            s6 = input.charAt(peg$currPos);
+            peg$currPos++;
+          } else {
+            s6 = peg$FAILED;
+            if (peg$silentFails === 0) { peg$fail(peg$e25); }
+          }
+        }
+        peg$savedPos = s0;
+        s0 = peg$f9(s1, s3, s5);
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+    } else {
+      peg$currPos = s0;
+      s0 = peg$FAILED;
+    }
+    if (s0 === peg$FAILED) {
+      s0 = peg$currPos;
+      s1 = [];
+      if (input.length > peg$currPos) {
+        s2 = input.charAt(peg$currPos);
+        peg$currPos++;
+      } else {
+        s2 = peg$FAILED;
+        if (peg$silentFails === 0) { peg$fail(peg$e25); }
+      }
+      while (s2 !== peg$FAILED) {
+        s1.push(s2);
+        if (input.length > peg$currPos) {
+          s2 = input.charAt(peg$currPos);
+          peg$currPos++;
+        } else {
+          s2 = peg$FAILED;
+          if (peg$silentFails === 0) { peg$fail(peg$e25); }
+        }
+      }
+      peg$savedPos = s0;
+      s1 = peg$f10(s1);
+      s0 = s1;
+    }
+    peg$silentFails--;
+    if (s0 === peg$FAILED) {
+      s1 = peg$FAILED;
+      if (peg$silentFails === 0) { peg$fail(peg$e22); }
+    }
+
+    return s0;
+  }
+
+
+  // Per-parsing tracking of attributes which should be ignored after first occurrence.
+  let seenAttributes = [];
+
+
+  peg$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
+};