Update - This is an automated commit

1 files changed, 1210 insertions, 0 deletions

diff --git a/school/node_modules/whatwg-url/dist/url-state-machine.js b/school/node_modules/whatwg-url/dist/url-state-machine.js
new file mode 100644
index 0000000..3640024
--- /dev/null
+++ b/school/node_modules/whatwg-url/dist/url-state-machine.js
@@ -0,0 +1,1210 @@
+"use strict";
+const punycode = require("punycode");
+const tr46 = require("tr46");
+
+const infra = require("./infra");
+const { utf8DecodeWithoutBOM } = require("./encoding");
+const { percentDecodeString, utf8PercentEncodeCodePoint, utf8PercentEncodeString, isC0ControlPercentEncode,
+  isFragmentPercentEncode, isQueryPercentEncode, isSpecialQueryPercentEncode, isPathPercentEncode,
+  isUserinfoPercentEncode } = require("./percent-encoding");
+
+const specialSchemes = {
+  ftp: 21,
+  file: null,
+  http: 80,
+  https: 443,
+  ws: 80,
+  wss: 443
+};
+
+const failure = Symbol("failure");
+
+function countSymbols(str) {
+  return [...str].length;
+}
+
+function at(input, idx) {
+  const c = input[idx];
+  return isNaN(c) ? undefined : String.fromCodePoint(c);
+}
+
+function isSingleDot(buffer) {
+  return buffer === "." || buffer.toLowerCase() === "%2e";
+}
+
+function isDoubleDot(buffer) {
+  buffer = buffer.toLowerCase();
+  return buffer === ".." || buffer === "%2e." || buffer === ".%2e" || buffer === "%2e%2e";
+}
+
+function isWindowsDriveLetterCodePoints(cp1, cp2) {
+  return infra.isASCIIAlpha(cp1) && (cp2 === 58 || cp2 === 124);
+}
+
+function isWindowsDriveLetterString(string) {
+  return string.length === 2 && infra.isASCIIAlpha(string.codePointAt(0)) && (string[1] === ":" || string[1] === "|");
+}
+
+function isNormalizedWindowsDriveLetterString(string) {
+  return string.length === 2 && infra.isASCIIAlpha(string.codePointAt(0)) && string[1] === ":";
+}
+
+function containsForbiddenHostCodePoint(string) {
+  return string.search(/\u0000|\u0009|\u000A|\u000D|\u0020|#|%|\/|:|<|>|\?|@|\[|\\|\]|\^|\|/u) !== -1;
+}
+
+function containsForbiddenHostCodePointExcludingPercent(string) {
+  return string.search(/\u0000|\u0009|\u000A|\u000D|\u0020|#|\/|:|<|>|\?|@|\[|\\|\]|\^|\|/u) !== -1;
+}
+
+function isSpecialScheme(scheme) {
+  return specialSchemes[scheme] !== undefined;
+}
+
+function isSpecial(url) {
+  return isSpecialScheme(url.scheme);
+}
+
+function isNotSpecial(url) {
+  return !isSpecialScheme(url.scheme);
+}
+
+function defaultPort(scheme) {
+  return specialSchemes[scheme];
+}
+
+function parseIPv4Number(input) {
+  let R = 10;
+
+  if (input.length >= 2 && input.charAt(0) === "0" && input.charAt(1).toLowerCase() === "x") {
+    input = input.substring(2);
+    R = 16;
+  } else if (input.length >= 2 && input.charAt(0) === "0") {
+    input = input.substring(1);
+    R = 8;
+  }
+
+  if (input === "") {
+    return 0;
+  }
+
+  let regex = /[^0-7]/u;
+  if (R === 10) {
+    regex = /[^0-9]/u;
+  }
+  if (R === 16) {
+    regex = /[^0-9A-Fa-f]/u;
+  }
+
+  if (regex.test(input)) {
+    return failure;
+  }
+
+  return parseInt(input, R);
+}
+
+function parseIPv4(input) {
+  const parts = input.split(".");
+  if (parts[parts.length - 1] === "") {
+    if (parts.length > 1) {
+      parts.pop();
+    }
+  }
+
+  if (parts.length > 4) {
+    return input;
+  }
+
+  const numbers = [];
+  for (const part of parts) {
+    if (part === "") {
+      return input;
+    }
+    const n = parseIPv4Number(part);
+    if (n === failure) {
+      return input;
+    }
+
+    numbers.push(n);
+  }
+
+  for (let i = 0; i < numbers.length - 1; ++i) {
+    if (numbers[i] > 255) {
+      return failure;
+    }
+  }
+  if (numbers[numbers.length - 1] >= 256 ** (5 - numbers.length)) {
+    return failure;
+  }
+
+  let ipv4 = numbers.pop();
+  let counter = 0;
+
+  for (const n of numbers) {
+    ipv4 += n * 256 ** (3 - counter);
+    ++counter;
+  }
+
+  return ipv4;
+}
+
+function serializeIPv4(address) {
+  let output = "";
+  let n = address;
+
+  for (let i = 1; i <= 4; ++i) {
+    output = String(n % 256) + output;
+    if (i !== 4) {
+      output = `.${output}`;
+    }
+    n = Math.floor(n / 256);
+  }
+
+  return output;
+}
+
+function parseIPv6(input) {
+  const address = [0, 0, 0, 0, 0, 0, 0, 0];
+  let pieceIndex = 0;
+  let compress = null;
+  let pointer = 0;
+
+  input = punycode.ucs2.decode(input);
+
+  if (input[pointer] === 58) {
+    if (input[pointer + 1] !== 58) {
+      return failure;
+    }
+
+    pointer += 2;
+    ++pieceIndex;
+    compress = pieceIndex;
+  }
+
+  while (pointer < input.length) {
+    if (pieceIndex === 8) {
+      return failure;
+    }
+
+    if (input[pointer] === 58) {
+      if (compress !== null) {
+        return failure;
+      }
+      ++pointer;
+      ++pieceIndex;
+      compress = pieceIndex;
+      continue;
+    }
+
+    let value = 0;
+    let length = 0;
+
+    while (length < 4 && infra.isASCIIHex(input[pointer])) {
+      value = value * 0x10 + parseInt(at(input, pointer), 16);
+      ++pointer;
+      ++length;
+    }
+
+    if (input[pointer] === 46) {
+      if (length === 0) {
+        return failure;
+      }
+
+      pointer -= length;
+
+      if (pieceIndex > 6) {
+        return failure;
+      }
+
+      let numbersSeen = 0;
+
+      while (input[pointer] !== undefined) {
+        let ipv4Piece = null;
+
+        if (numbersSeen > 0) {
+          if (input[pointer] === 46 && numbersSeen < 4) {
+            ++pointer;
+          } else {
+            return failure;
+          }
+        }
+
+        if (!infra.isASCIIDigit(input[pointer])) {
+          return failure;
+        }
+
+        while (infra.isASCIIDigit(input[pointer])) {
+          const number = parseInt(at(input, pointer));
+          if (ipv4Piece === null) {
+            ipv4Piece = number;
+          } else if (ipv4Piece === 0) {
+            return failure;
+          } else {
+            ipv4Piece = ipv4Piece * 10 + number;
+          }
+          if (ipv4Piece > 255) {
+            return failure;
+          }
+          ++pointer;
+        }
+
+        address[pieceIndex] = address[pieceIndex] * 0x100 + ipv4Piece;
+
+        ++numbersSeen;
+
+        if (numbersSeen === 2 || numbersSeen === 4) {
+          ++pieceIndex;
+        }
+      }
+
+      if (numbersSeen !== 4) {
+        return failure;
+      }
+
+      break;
+    } else if (input[pointer] === 58) {
+      ++pointer;
+      if (input[pointer] === undefined) {
+        return failure;
+      }
+    } else if (input[pointer] !== undefined) {
+      return failure;
+    }
+
+    address[pieceIndex] = value;
+    ++pieceIndex;
+  }
+
+  if (compress !== null) {
+    let swaps = pieceIndex - compress;
+    pieceIndex = 7;
+    while (pieceIndex !== 0 && swaps > 0) {
+      const temp = address[compress + swaps - 1];
+      address[compress + swaps - 1] = address[pieceIndex];
+      address[pieceIndex] = temp;
+      --pieceIndex;
+      --swaps;
+    }
+  } else if (compress === null && pieceIndex !== 8) {
+    return failure;
+  }
+
+  return address;
+}
+
+function serializeIPv6(address) {
+  let output = "";
+  const compress = findLongestZeroSequence(address);
+  let ignore0 = false;
+
+  for (let pieceIndex = 0; pieceIndex <= 7; ++pieceIndex) {
+    if (ignore0 && address[pieceIndex] === 0) {
+      continue;
+    } else if (ignore0) {
+      ignore0 = false;
+    }
+
+    if (compress === pieceIndex) {
+      const separator = pieceIndex === 0 ? "::" : ":";
+      output += separator;
+      ignore0 = true;
+      continue;
+    }
+
+    output += address[pieceIndex].toString(16);
+
+    if (pieceIndex !== 7) {
+      output += ":";
+    }
+  }
+
+  return output;
+}
+
+function parseHost(input, isNotSpecialArg = false) {
+  if (input[0] === "[") {
+    if (input[input.length - 1] !== "]") {
+      return failure;
+    }
+
+    return parseIPv6(input.substring(1, input.length - 1));
+  }
+
+  if (isNotSpecialArg) {
+    return parseOpaqueHost(input);
+  }
+
+  const domain = utf8DecodeWithoutBOM(percentDecodeString(input));
+  const asciiDomain = domainToASCII(domain);
+  if (asciiDomain === failure) {
+    return failure;
+  }
+
+  if (containsForbiddenHostCodePoint(asciiDomain)) {
+    return failure;
+  }
+
+  const ipv4Host = parseIPv4(asciiDomain);
+  if (typeof ipv4Host === "number" || ipv4Host === failure) {
+    return ipv4Host;
+  }
+
+  return asciiDomain;
+}
+
+function parseOpaqueHost(input) {
+  if (containsForbiddenHostCodePointExcludingPercent(input)) {
+    return failure;
+  }
+
+  return utf8PercentEncodeString(input, isC0ControlPercentEncode);
+}
+
+function findLongestZeroSequence(arr) {
+  let maxIdx = null;
+  let maxLen = 1; // only find elements > 1
+  let currStart = null;
+  let currLen = 0;
+
+  for (let i = 0; i < arr.length; ++i) {
+    if (arr[i] !== 0) {
+      if (currLen > maxLen) {
+        maxIdx = currStart;
+        maxLen = currLen;
+      }
+
+      currStart = null;
+      currLen = 0;
+    } else {
+      if (currStart === null) {
+        currStart = i;
+      }
+      ++currLen;
+    }
+  }
+
+  // if trailing zeros
+  if (currLen > maxLen) {
+    return currStart;
+  }
+
+  return maxIdx;
+}
+
+function serializeHost(host) {
+  if (typeof host === "number") {
+    return serializeIPv4(host);
+  }
+
+  // IPv6 serializer
+  if (host instanceof Array) {
+    return `[${serializeIPv6(host)}]`;
+  }
+
+  return host;
+}
+
+function domainToASCII(domain, beStrict = false) {
+  const result = tr46.toASCII(domain, {
+    checkBidi: true,
+    checkHyphens: false,
+    checkJoiners: true,
+    useSTD3ASCIIRules: beStrict,
+    verifyDNSLength: beStrict
+  });
+  if (result === null || result === "") {
+    return failure;
+  }
+  return result;
+}
+
+function trimControlChars(url) {
+  return url.replace(/^[\u0000-\u001F\u0020]+|[\u0000-\u001F\u0020]+$/ug, "");
+}
+
+function trimTabAndNewline(url) {
+  return url.replace(/\u0009|\u000A|\u000D/ug, "");
+}
+
+function shortenPath(url) {
+  const { path } = url;
+  if (path.length === 0) {
+    return;
+  }
+  if (url.scheme === "file" && path.length === 1 && isNormalizedWindowsDriveLetter(path[0])) {
+    return;
+  }
+
+  path.pop();
+}
+
+function includesCredentials(url) {
+  return url.username !== "" || url.password !== "";
+}
+
+function cannotHaveAUsernamePasswordPort(url) {
+  return url.host === null || url.host === "" || url.cannotBeABaseURL || url.scheme === "file";
+}
+
+function isNormalizedWindowsDriveLetter(string) {
+  return /^[A-Za-z]:$/u.test(string);
+}
+
+function URLStateMachine(input, base, encodingOverride, url, stateOverride) {
+  this.pointer = 0;
+  this.input = input;
+  this.base = base || null;
+  this.encodingOverride = encodingOverride || "utf-8";
+  this.stateOverride = stateOverride;
+  this.url = url;
+  this.failure = false;
+  this.parseError = false;
+
+  if (!this.url) {
+    this.url = {
+      scheme: "",
+      username: "",
+      password: "",
+      host: null,
+      port: null,
+      path: [],
+      query: null,
+      fragment: null,
+
+      cannotBeABaseURL: false
+    };
+
+    const res = trimControlChars(this.input);
+    if (res !== this.input) {
+      this.parseError = true;
+    }
+    this.input = res;
+  }
+
+  const res = trimTabAndNewline(this.input);
+  if (res !== this.input) {
+    this.parseError = true;
+  }
+  this.input = res;
+
+  this.state = stateOverride || "scheme start";
+
+  this.buffer = "";
+  this.atFlag = false;
+  this.arrFlag = false;
+  this.passwordTokenSeenFlag = false;
+
+  this.input = punycode.ucs2.decode(this.input);
+
+  for (; this.pointer <= this.input.length; ++this.pointer) {
+    const c = this.input[this.pointer];
+    const cStr = isNaN(c) ? undefined : String.fromCodePoint(c);
+
+    // exec state machine
+    const ret = this[`parse ${this.state}`](c, cStr);
+    if (!ret) {
+      break; // terminate algorithm
+    } else if (ret === failure) {
+      this.failure = true;
+      break;
+    }
+  }
+}
+
+URLStateMachine.prototype["parse scheme start"] = function parseSchemeStart(c, cStr) {
+  if (infra.isASCIIAlpha(c)) {
+    this.buffer += cStr.toLowerCase();
+    this.state = "scheme";
+  } else if (!this.stateOverride) {
+    this.state = "no scheme";
+    --this.pointer;
+  } else {
+    this.parseError = true;
+    return failure;
+  }
+
+  return true;
+};
+
+URLStateMachine.prototype["parse scheme"] = function parseScheme(c, cStr) {
+  if (infra.isASCIIAlphanumeric(c) || c === 43 || c === 45 || c === 46) {
+    this.buffer += cStr.toLowerCase();
+  } else if (c === 58) {
+    if (this.stateOverride) {
+      if (isSpecial(this.url) && !isSpecialScheme(this.buffer)) {
+        return false;
+      }
+
+      if (!isSpecial(this.url) && isSpecialScheme(this.buffer)) {
+        return false;
+      }
+
+      if ((includesCredentials(this.url) || this.url.port !== null) && this.buffer === "file") {
+        return false;
+      }
+
+      if (this.url.scheme === "file" && this.url.host === "") {
+        return false;
+      }
+    }
+    this.url.scheme = this.buffer;
+    if (this.stateOverride) {
+      if (this.url.port === defaultPort(this.url.scheme)) {
+        this.url.port = null;
+      }
+      return false;
+    }
+    this.buffer = "";
+    if (this.url.scheme === "file") {
+      if (this.input[this.pointer + 1] !== 47 || this.input[this.pointer + 2] !== 47) {
+        this.parseError = true;
+      }
+      this.state = "file";
+    } else if (isSpecial(this.url) && this.base !== null && this.base.scheme === this.url.scheme) {
+      this.state = "special relative or authority";
+    } else if (isSpecial(this.url)) {
+      this.state = "special authority slashes";
+    } else if (this.input[this.pointer + 1] === 47) {
+      this.state = "path or authority";
+      ++this.pointer;
+    } else {
+      this.url.cannotBeABaseURL = true;
+      this.url.path.push("");
+      this.state = "cannot-be-a-base-URL path";
+    }
+  } else if (!this.stateOverride) {
+    this.buffer = "";
+    this.state = "no scheme";
+    this.pointer = -1;
+  } else {
+    this.parseError = true;
+    return failure;
+  }
+
+  return true;
+};
+
+URLStateMachine.prototype["parse no scheme"] = function parseNoScheme(c) {
+  if (this.base === null || (this.base.cannotBeABaseURL && c !== 35)) {
+    return failure;
+  } else if (this.base.cannotBeABaseURL && c === 35) {
+    this.url.scheme = this.base.scheme;
+    this.url.path = this.base.path.slice();
+    this.url.query = this.base.query;
+    this.url.fragment = "";
+    this.url.cannotBeABaseURL = true;
+    this.state = "fragment";
+  } else if (this.base.scheme === "file") {
+    this.state = "file";
+    --this.pointer;
+  } else {
+    this.state = "relative";
+    --this.pointer;
+  }
+
+  return true;
+};
+
+URLStateMachine.prototype["parse special relative or authority"] = function parseSpecialRelativeOrAuthority(c) {
+  if (c === 47 && this.input[this.pointer + 1] === 47) {
+    this.state = "special authority ignore slashes";
+    ++this.pointer;
+  } else {
+    this.parseError = true;
+    this.state = "relative";
+    --this.pointer;
+  }
+
+  return true;
+};
+
+URLStateMachine.prototype["parse path or authority"] = function parsePathOrAuthority(c) {
+  if (c === 47) {
+    this.state = "authority";
+  } else {
+    this.state = "path";
+    --this.pointer;
+  }
+
+  return true;
+};
+
+URLStateMachine.prototype["parse relative"] = function parseRelative(c) {
+  this.url.scheme = this.base.scheme;
+  if (c === 47) {
+    this.state = "relative slash";
+  } else if (isSpecial(this.url) && c === 92) {
+    this.parseError = true;
+    this.state = "relative slash";
+  } else {
+    this.url.username = this.base.username;
+    this.url.password = this.base.password;
+    this.url.host = this.base.host;
+    this.url.port = this.base.port;
+    this.url.path = this.base.path.slice();
+    this.url.query = this.base.query;
+    if (c === 63) {
+      this.url.query = "";
+      this.state = "query";
+    } else if (c === 35) {
+      this.url.fragment = "";
+      this.state = "fragment";
+    } else if (!isNaN(c)) {
+      this.url.query = null;
+      this.url.path.pop();
+      this.state = "path";
+      --this.pointer;
+    }
+  }
+
+  return true;
+};
+
+URLStateMachine.prototype["parse relative slash"] = function parseRelativeSlash(c) {
+  if (isSpecial(this.url) && (c === 47 || c === 92)) {
+    if (c === 92) {
+      this.parseError = true;
+    }
+    this.state = "special authority ignore slashes";
+  } else if (c === 47) {
+    this.state = "authority";
+  } else {
+    this.url.username = this.base.username;
+    this.url.password = this.base.password;
+    this.url.host = this.base.host;
+    this.url.port = this.base.port;
+    this.state = "path";
+    --this.pointer;
+  }
+
+  return true;
+};
+
+URLStateMachine.prototype["parse special authority slashes"] = function parseSpecialAuthoritySlashes(c) {
+  if (c === 47 && this.input[this.pointer + 1] === 47) {
+    this.state = "special authority ignore slashes";
+    ++this.pointer;
+  } else {
+    this.parseError = true;
+    this.state = "special authority ignore slashes";
+    --this.pointer;
+  }
+
+  return true;
+};
+
+URLStateMachine.prototype["parse special authority ignore slashes"] = function parseSpecialAuthorityIgnoreSlashes(c) {
+  if (c !== 47 && c !== 92) {
+    this.state = "authority";
+    --this.pointer;
+  } else {
+    this.parseError = true;
+  }
+
+  return true;
+};
+
+URLStateMachine.prototype["parse authority"] = function parseAuthority(c, cStr) {
+  if (c === 64) {
+    this.parseError = true;
+    if (this.atFlag) {
+      this.buffer = `%40${this.buffer}`;
+    }
+    this.atFlag = true;
+
+    // careful, this is based on buffer and has its own pointer (this.pointer != pointer) and inner chars
+    const len = countSymbols(this.buffer);
+    for (let pointer = 0; pointer < len; ++pointer) {
+      const codePoint = this.buffer.codePointAt(pointer);
+
+      if (codePoint === 58 && !this.passwordTokenSeenFlag) {
+        this.passwordTokenSeenFlag = true;
+        continue;
+      }
+      const encodedCodePoints = utf8PercentEncodeCodePoint(codePoint, isUserinfoPercentEncode);
+      if (this.passwordTokenSeenFlag) {
+        this.url.password += encodedCodePoints;
+      } else {
+        this.url.username += encodedCodePoints;
+      }
+    }
+    this.buffer = "";
+  } else if (isNaN(c) || c === 47 || c === 63 || c === 35 ||
+             (isSpecial(this.url) && c === 92)) {
+    if (this.atFlag && this.buffer === "") {
+      this.parseError = true;
+      return failure;
+    }
+    this.pointer -= countSymbols(this.buffer) + 1;
+    this.buffer = "";
+    this.state = "host";
+  } else {
+    this.buffer += cStr;
+  }
+
+  return true;
+};
+
+URLStateMachine.prototype["parse hostname"] =
+URLStateMachine.prototype["parse host"] = function parseHostName(c, cStr) {
+  if (this.stateOverride && this.url.scheme === "file") {
+    --this.pointer;
+    this.state = "file host";
+  } else if (c === 58 && !this.arrFlag) {
+    if (this.buffer === "") {
+      this.parseError = true;
+      return failure;
+    }
+
+    if (this.stateOverride === "hostname") {
+      return false;
+    }
+
+    const host = parseHost(this.buffer, isNotSpecial(this.url));
+    if (host === failure) {
+      return failure;
+    }
+
+    this.url.host = host;
+    this.buffer = "";
+    this.state = "port";
+  } else if (isNaN(c) || c === 47 || c === 63 || c === 35 ||
+             (isSpecial(this.url) && c === 92)) {
+    --this.pointer;
+    if (isSpecial(this.url) && this.buffer === "") {
+      this.parseError = true;
+      return failure;
+    } else if (this.stateOverride && this.buffer === "" &&
+               (includesCredentials(this.url) || this.url.port !== null)) {
+      this.parseError = true;
+      return false;
+    }
+
+    const host = parseHost(this.buffer, isNotSpecial(this.url));
+    if (host === failure) {
+      return failure;
+    }
+
+    this.url.host = host;
+    this.buffer = "";
+    this.state = "path start";
+    if (this.stateOverride) {
+      return false;
+    }
+  } else {
+    if (c === 91) {
+      this.arrFlag = true;
+    } else if (c === 93) {
+      this.arrFlag = false;
+    }
+    this.buffer += cStr;
+  }
+
+  return true;
+};
+
+URLStateMachine.prototype["parse port"] = function parsePort(c, cStr) {
+  if (infra.isASCIIDigit(c)) {
+    this.buffer += cStr;
+  } else if (isNaN(c) || c === 47 || c === 63 || c === 35 ||
+             (isSpecial(this.url) && c === 92) ||
+             this.stateOverride) {
+    if (this.buffer !== "") {
+      const port = parseInt(this.buffer);
+      if (port > 2 ** 16 - 1) {
+        this.parseError = true;
+        return failure;
+      }
+      this.url.port = port === defaultPort(this.url.scheme) ? null : port;
+      this.buffer = "";
+    }
+    if (this.stateOverride) {
+      return false;
+    }
+    this.state = "path start";
+    --this.pointer;
+  } else {
+    this.parseError = true;
+    return failure;
+  }
+
+  return true;
+};
+
+const fileOtherwiseCodePoints = new Set([47, 92, 63, 35]);
+
+function startsWithWindowsDriveLetter(input, pointer) {
+  const length = input.length - pointer;
+  return length >= 2 &&
+    isWindowsDriveLetterCodePoints(input[pointer], input[pointer + 1]) &&
+    (length === 2 || fileOtherwiseCodePoints.has(input[pointer + 2]));
+}
+
+URLStateMachine.prototype["parse file"] = function parseFile(c) {
+  this.url.scheme = "file";
+  this.url.host = "";
+
+  if (c === 47 || c === 92) {
+    if (c === 92) {
+      this.parseError = true;
+    }
+    this.state = "file slash";
+  } else if (this.base !== null && this.base.scheme === "file") {
+    this.url.host = this.base.host;
+    this.url.path = this.base.path.slice();
+    this.url.query = this.base.query;
+    if (c === 63) {
+      this.url.query = "";
+      this.state = "query";
+    } else if (c === 35) {
+      this.url.fragment = "";
+      this.state = "fragment";
+    } else if (!isNaN(c)) {
+      this.url.query = null;
+      if (!startsWithWindowsDriveLetter(this.input, this.pointer)) {
+        shortenPath(this.url);
+      } else {
+        this.parseError = true;
+        this.url.path = [];
+      }
+
+      this.state = "path";
+      --this.pointer;
+    }
+  } else {
+    this.state = "path";
+    --this.pointer;
+  }
+
+  return true;
+};
+
+URLStateMachine.prototype["parse file slash"] = function parseFileSlash(c) {
+  if (c === 47 || c === 92) {
+    if (c === 92) {
+      this.parseError = true;
+    }
+    this.state = "file host";
+  } else {
+    if (this.base !== null && this.base.scheme === "file") {
+      if (!startsWithWindowsDriveLetter(this.input, this.pointer) &&
+          isNormalizedWindowsDriveLetterString(this.base.path[0])) {
+        this.url.path.push(this.base.path[0]);
+      }
+      this.url.host = this.base.host;
+    }
+    this.state = "path";
+    --this.pointer;
+  }
+
+  return true;
+};
+
+URLStateMachine.prototype["parse file host"] = function parseFileHost(c, cStr) {
+  if (isNaN(c) || c === 47 || c === 92 || c === 63 || c === 35) {
+    --this.pointer;
+    if (!this.stateOverride && isWindowsDriveLetterString(this.buffer)) {
+      this.parseError = true;
+      this.state = "path";
+    } else if (this.buffer === "") {
+      this.url.host = "";
+      if (this.stateOverride) {
+        return false;
+      }
+      this.state = "path start";
+    } else {
+      let host = parseHost(this.buffer, isNotSpecial(this.url));
+      if (host === failure) {
+        return failure;
+      }
+      if (host === "localhost") {
+        host = "";
+      }
+      this.url.host = host;
+
+      if (this.stateOverride) {
+        return false;
+      }
+
+      this.buffer = "";
+      this.state = "path start";
+    }
+  } else {
+    this.buffer += cStr;
+  }
+
+  return true;
+};
+
+URLStateMachine.prototype["parse path start"] = function parsePathStart(c) {
+  if (isSpecial(this.url)) {
+    if (c === 92) {
+      this.parseError = true;
+    }
+    this.state = "path";
+
+    if (c !== 47 && c !== 92) {
+      --this.pointer;
+    }
+  } else if (!this.stateOverride && c === 63) {
+    this.url.query = "";
+    this.state = "query";
+  } else if (!this.stateOverride && c === 35) {
+    this.url.fragment = "";
+    this.state = "fragment";
+  } else if (c !== undefined) {
+    this.state = "path";
+    if (c !== 47) {
+      --this.pointer;
+    }
+  } else if (this.stateOverride && this.url.host === null) {
+    this.url.path.push("");
+  }
+
+  return true;
+};
+
+URLStateMachine.prototype["parse path"] = function parsePath(c) {
+  if (isNaN(c) || c === 47 || (isSpecial(this.url) && c === 92) ||
+      (!this.stateOverride && (c === 63 || c === 35))) {
+    if (isSpecial(this.url) && c === 92) {
+      this.parseError = true;
+    }
+
+    if (isDoubleDot(this.buffer)) {
+      shortenPath(this.url);
+      if (c !== 47 && !(isSpecial(this.url) && c === 92)) {
+        this.url.path.push("");
+      }
+    } else if (isSingleDot(this.buffer) && c !== 47 &&
+               !(isSpecial(this.url) && c === 92)) {
+      this.url.path.push("");
+    } else if (!isSingleDot(this.buffer)) {
+      if (this.url.scheme === "file" && this.url.path.length === 0 && isWindowsDriveLetterString(this.buffer)) {
+        this.buffer = `${this.buffer[0]}:`;
+      }
+      this.url.path.push(this.buffer);
+    }
+    this.buffer = "";
+    if (c === 63) {
+      this.url.query = "";
+      this.state = "query";
+    }
+    if (c === 35) {
+      this.url.fragment = "";
+      this.state = "fragment";
+    }
+  } else {
+    // TODO: If c is not a URL code point and not "%", parse error.
+
+    if (c === 37 &&
+      (!infra.isASCIIHex(this.input[this.pointer + 1]) ||
+        !infra.isASCIIHex(this.input[this.pointer + 2]))) {
+      this.parseError = true;
+    }
+
+    this.buffer += utf8PercentEncodeCodePoint(c, isPathPercentEncode);
+  }
+
+  return true;
+};
+
+URLStateMachine.prototype["parse cannot-be-a-base-URL path"] = function parseCannotBeABaseURLPath(c) {
+  if (c === 63) {
+    this.url.query = "";
+    this.state = "query";
+  } else if (c === 35) {
+    this.url.fragment = "";
+    this.state = "fragment";
+  } else {
+    // TODO: Add: not a URL code point
+    if (!isNaN(c) && c !== 37) {
+      this.parseError = true;
+    }
+
+    if (c === 37 &&
+        (!infra.isASCIIHex(this.input[this.pointer + 1]) ||
+         !infra.isASCIIHex(this.input[this.pointer + 2]))) {
+      this.parseError = true;
+    }
+
+    if (!isNaN(c)) {
+      this.url.path[0] += utf8PercentEncodeCodePoint(c, isC0ControlPercentEncode);
+    }
+  }
+
+  return true;
+};
+
+URLStateMachine.prototype["parse query"] = function parseQuery(c, cStr) {
+  if (!isSpecial(this.url) || this.url.scheme === "ws" || this.url.scheme === "wss") {
+    this.encodingOverride = "utf-8";
+  }
+
+  if ((!this.stateOverride && c === 35) || isNaN(c)) {
+    const queryPercentEncodePredicate = isSpecial(this.url) ? isSpecialQueryPercentEncode : isQueryPercentEncode;
+    this.url.query += utf8PercentEncodeString(this.buffer, queryPercentEncodePredicate);
+
+    this.buffer = "";
+
+    if (c === 35) {
+      this.url.fragment = "";
+      this.state = "fragment";
+    }
+  } else if (!isNaN(c)) {
+    // TODO: If c is not a URL code point and not "%", parse error.
+
+    if (c === 37 &&
+      (!infra.isASCIIHex(this.input[this.pointer + 1]) ||
+        !infra.isASCIIHex(this.input[this.pointer + 2]))) {
+      this.parseError = true;
+    }
+
+    this.buffer += cStr;
+  }
+
+  return true;
+};
+
+URLStateMachine.prototype["parse fragment"] = function parseFragment(c) {
+  if (!isNaN(c)) {
+    // TODO: If c is not a URL code point and not "%", parse error.
+    if (c === 37 &&
+      (!infra.isASCIIHex(this.input[this.pointer + 1]) ||
+        !infra.isASCIIHex(this.input[this.pointer + 2]))) {
+      this.parseError = true;
+    }
+
+    this.url.fragment += utf8PercentEncodeCodePoint(c, isFragmentPercentEncode);
+  }
+
+  return true;
+};
+
+function serializeURL(url, excludeFragment) {
+  let output = `${url.scheme}:`;
+  if (url.host !== null) {
+    output += "//";
+
+    if (url.username !== "" || url.password !== "") {
+      output += url.username;
+      if (url.password !== "") {
+        output += `:${url.password}`;
+      }
+      output += "@";
+    }
+
+    output += serializeHost(url.host);
+
+    if (url.port !== null) {
+      output += `:${url.port}`;
+    }
+  }
+
+  if (url.cannotBeABaseURL) {
+    output += url.path[0];
+  } else {
+    if (url.host === null && url.path.length > 1 && url.path[0] === "") {
+      output += "/.";
+    }
+    for (const segment of url.path) {
+      output += `/${segment}`;
+    }
+  }
+
+  if (url.query !== null) {
+    output += `?${url.query}`;
+  }
+
+  if (!excludeFragment && url.fragment !== null) {
+    output += `#${url.fragment}`;
+  }
+
+  return output;
+}
+
+function serializeOrigin(tuple) {
+  let result = `${tuple.scheme}://`;
+  result += serializeHost(tuple.host);
+
+  if (tuple.port !== null) {
+    result += `:${tuple.port}`;
+  }
+
+  return result;
+}
+
+module.exports.serializeURL = serializeURL;
+
+module.exports.serializeURLOrigin = function (url) {
+  // https://url.spec.whatwg.org/#concept-url-origin
+  switch (url.scheme) {
+    case "blob":
+      try {
+        return module.exports.serializeURLOrigin(module.exports.parseURL(url.path[0]));
+      } catch (e) {
+        // serializing an opaque origin returns "null"
+        return "null";
+      }
+    case "ftp":
+    case "http":
+    case "https":
+    case "ws":
+    case "wss":
+      return serializeOrigin({
+        scheme: url.scheme,
+        host: url.host,
+        port: url.port
+      });
+    case "file":
+      // The spec says:
+      // > Unfortunate as it is, this is left as an exercise to the reader. When in doubt, return a new opaque origin.
+      // Browsers tested so far:
+      // - Chrome says "file://", but treats file: URLs as cross-origin for most (all?) purposes; see e.g.
+      //   https://bugs.chromium.org/p/chromium/issues/detail?id=37586
+      // - Firefox says "null", but treats file: URLs as same-origin sometimes based on directory stuff; see
+      //   https://developer.mozilla.org/en-US/docs/Archive/Misc_top_level/Same-origin_policy_for_file:_URIs
+      return "null";
+    default:
+      // serializing an opaque origin returns "null"
+      return "null";
+  }
+};
+
+module.exports.basicURLParse = function (input, options) {
+  if (options === undefined) {
+    options = {};
+  }
+
+  const usm = new URLStateMachine(input, options.baseURL, options.encodingOverride, options.url, options.stateOverride);
+  if (usm.failure) {
+    return null;
+  }
+
+  return usm.url;
+};
+
+module.exports.setTheUsername = function (url, username) {
+  url.username = utf8PercentEncodeString(username, isUserinfoPercentEncode);
+};
+
+module.exports.setThePassword = function (url, password) {
+  url.password = utf8PercentEncodeString(password, isUserinfoPercentEncode);
+};
+
+module.exports.serializeHost = serializeHost;
+
+module.exports.cannotHaveAUsernamePasswordPort = cannotHaveAUsernamePasswordPort;
+
+module.exports.serializeInteger = function (integer) {
+  return String(integer);
+};
+
+module.exports.parseURL = function (input, options) {
+  if (options === undefined) {
+    options = {};
+  }
+
+  // We don't handle blobs, so this just delegates:
+  return module.exports.basicURLParse(input, { baseURL: options.baseURL, encodingOverride: options.encodingOverride });
+};