1 files changed, 203 insertions, 0 deletions
diff --git a/extensions/web/00_infra.js b/extensions/web/00_infra.js
new file mode 100644
index 000000000..05f68268f
--- /dev/null
+++ b/extensions/web/00_infra.js
@@ -0,0 +1,203 @@
+// Copyright 2018-2021 the Deno authors. All rights reserved. MIT license.
+
+// @ts-check
+/// <reference path="../../core/lib.deno_core.d.ts" />
+/// <reference path="../web/internal.d.ts" />
+/// <reference path="../web/lib.deno_web.d.ts" />
+
+"use strict";
+
+((window) => {
+  const ASCII_DIGIT = ["\u0030-\u0039"];
+  const ASCII_UPPER_ALPHA = ["\u0041-\u005A"];
+  const ASCII_LOWER_ALPHA = ["\u0061-\u007A"];
+  const ASCII_ALPHA = [...ASCII_UPPER_ALPHA, ...ASCII_LOWER_ALPHA];
+  const ASCII_ALPHANUMERIC = [...ASCII_DIGIT, ...ASCII_ALPHA];
+
+  const HTTP_TAB_OR_SPACE = ["\u0009", "\u0020"];
+  const HTTP_WHITESPACE = ["\u000A", "\u000D", ...HTTP_TAB_OR_SPACE];
+
+  const HTTP_TOKEN_CODE_POINT = [
+    "\u0021",
+    "\u0023",
+    "\u0024",
+    "\u0025",
+    "\u0026",
+    "\u0027",
+    "\u002A",
+    "\u002B",
+    "\u002D",
+    "\u002E",
+    "\u005E",
+    "\u005F",
+    "\u0060",
+    "\u007C",
+    "\u007E",
+    ...ASCII_ALPHANUMERIC,
+  ];
+  const HTTP_TOKEN_CODE_POINT_RE = new RegExp(
+    `^[${regexMatcher(HTTP_TOKEN_CODE_POINT)}]+$`,
+  );
+  const HTTP_QUOTED_STRING_TOKEN_POINT = [
+    "\u0009",
+    "\u0020-\u007E",
+    "\u0080-\u00FF",
+  ];
+  const HTTP_QUOTED_STRING_TOKEN_POINT_RE = new RegExp(
+    `^[${regexMatcher(HTTP_QUOTED_STRING_TOKEN_POINT)}]+$`,
+  );
+  const HTTP_TAB_OR_SPACE_MATCHER = regexMatcher(HTTP_TAB_OR_SPACE);
+  const HTTP_TAB_OR_SPACE_PREFIX_RE = new RegExp(
+    `^[${HTTP_TAB_OR_SPACE_MATCHER}]+`,
+    "g",
+  );
+  const HTTP_TAB_OR_SPACE_SUFFIX_RE = new RegExp(
+    `[${HTTP_TAB_OR_SPACE_MATCHER}]+$`,
+    "g",
+  );
+  const HTTP_WHITESPACE_MATCHER = regexMatcher(HTTP_WHITESPACE);
+  const HTTP_WHITESPACE_PREFIX_RE = new RegExp(
+    `^[${HTTP_WHITESPACE_MATCHER}]+`,
+    "g",
+  );
+  const HTTP_WHITESPACE_SUFFIX_RE = new RegExp(
+    `[${HTTP_WHITESPACE_MATCHER}]+$`,
+    "g",
+  );
+
+  /**
+   * Turn a string of chars into a regex safe matcher.
+   * @param {string[]} chars
+   * @returns {string}
+   */
+  function regexMatcher(chars) {
+    const matchers = chars.map((char) => {
+      if (char.length === 1) {
+        return `\\u${char.charCodeAt(0).toString(16).padStart(4, "0")}`;
+      } else if (char.length === 3 && char[1] === "-") {
+        return `\\u${char.charCodeAt(0).toString(16).padStart(4, "0")}-\\u${
+          char.charCodeAt(2).toString(16).padStart(4, "0")
+        }`;
+      } else {
+        throw TypeError("unreachable");
+      }
+    });
+    return matchers.join("");
+  }
+
+  /**
+   * https://infra.spec.whatwg.org/#collect-a-sequence-of-code-points
+   * @param {string} input
+   * @param {number} position
+   * @param {(char: string) => boolean} condition
+   * @returns {{result: string, position: number}}
+   */
+  function collectSequenceOfCodepoints(input, position, condition) {
+    const start = position;
+    for (
+      let c = input.charAt(position);
+      position < input.length && condition(c);
+      c = input.charAt(++position)
+    );
+    return { result: input.slice(start, position), position };
+  }
+
+  /**
+   * @param {string} s
+   * @returns {string}
+   */
+  function byteUpperCase(s) {
+    return String(s).replace(/[a-z]/g, function byteUpperCaseReplace(c) {
+      return c.toUpperCase();
+    });
+  }
+
+  /**
+   * @param {string} s
+   * @returns {string}
+   */
+  function byteLowerCase(s) {
+    return String(s).replace(/[A-Z]/g, function byteUpperCaseReplace(c) {
+      return c.toLowerCase();
+    });
+  }
+
+  /**
+   * https://fetch.spec.whatwg.org/#collect-an-http-quoted-string
+   * @param {string} input
+   * @param {number} position
+   * @param {boolean} extractValue
+   * @returns {{result: string, position: number}}
+   */
+  function collectHttpQuotedString(input, position, extractValue) {
+    // 1.
+    const positionStart = position;
+    // 2.
+    let value = "";
+    // 3.
+    if (input[position] !== "\u0022") throw new Error('must be "');
+    // 4.
+    position++;
+    // 5.
+    while (true) {
+      // 5.1.
+      const res = collectSequenceOfCodepoints(
+        input,
+        position,
+        (c) => c !== "\u0022" && c !== "\u005C",
+      );
+      value += res.result;
+      position = res.position;
+      // 5.2.
+      if (position >= input.length) break;
+      // 5.3.
+      const quoteOrBackslash = input[position];
+      // 5.4.
+      position++;
+      // 5.5.
+      if (quoteOrBackslash === "\u005C") {
+        // 5.5.1.
+        if (position >= input.length) {
+          value += "\u005C";
+          break;
+        }
+        // 5.5.2.
+        value += input[position];
+        // 5.5.3.
+        position++;
+      } else { // 5.6.
+        // 5.6.1
+        if (quoteOrBackslash !== "\u0022") throw new Error('must be "');
+        // 5.6.2
+        break;
+      }
+    }
+    // 6.
+    if (extractValue) return { result: value, position };
+    // 7.
+    return { result: input.substring(positionStart, position + 1), position };
+  }
+
+  window.__bootstrap.infra = {
+    collectSequenceOfCodepoints,
+    ASCII_DIGIT,
+    ASCII_UPPER_ALPHA,
+    ASCII_LOWER_ALPHA,
+    ASCII_ALPHA,
+    ASCII_ALPHANUMERIC,
+    HTTP_TAB_OR_SPACE,
+    HTTP_WHITESPACE,
+    HTTP_TOKEN_CODE_POINT,
+    HTTP_TOKEN_CODE_POINT_RE,
+    HTTP_QUOTED_STRING_TOKEN_POINT,
+    HTTP_QUOTED_STRING_TOKEN_POINT_RE,
+    HTTP_TAB_OR_SPACE_PREFIX_RE,
+    HTTP_TAB_OR_SPACE_SUFFIX_RE,
+    HTTP_WHITESPACE_PREFIX_RE,
+    HTTP_WHITESPACE_SUFFIX_RE,
+    regexMatcher,
+    byteUpperCase,
+    byteLowerCase,
+    collectHttpQuotedString,
+  };
+})(globalThis);