githubmirror/node

lib/internal/querystring.js
119 строк3 KB
Antoine du Hamel
lib: add trailing commas to more internal files
26 фев 2023, 13:34
26 фев 2023, 13:345f76836
'use strict';

const {
  Array,
  Int8Array,
  NumberPrototypeToString,
  StringPrototypeCharCodeAt,
  StringPrototypeSlice,
  StringPrototypeToUpperCase,
} = primordials;

const { ERR_INVALID_URI } = require('internal/errors').codes;

const hexTable = new Array(256);
for (let i = 0; i < 256; ++i)
  hexTable[i] = '%' +
                StringPrototypeToUpperCase((i < 16 ? '0' : '') +
                                           NumberPrototypeToString(i, 16));

const isHexTable = new Int8Array([
  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 0 - 15
  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 16 - 31
  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 32 - 47
  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, // 48 - 63
  0, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 64 - 79
  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 80 - 95
  0, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 96 - 111
  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 112 - 127
  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 128 ...
  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  // ... 256
]);

/**
 * @param {string} str
 * @param {Int8Array} noEscapeTable
 * @param {string[]} hexTable
 * @returns {string}
 */
function encodeStr(str, noEscapeTable, hexTable) {
  const len = str.length;
  if (len === 0)
    return '';

  let out = '';
  let lastPos = 0;
  let i = 0;

  outer:
  for (; i < len; i++) {
    let c = StringPrototypeCharCodeAt(str, i);

    // ASCII
    while (c < 0x80) {
      if (noEscapeTable[c] !== 1) {
        if (lastPos < i)
          out += StringPrototypeSlice(str, lastPos, i);
        lastPos = i + 1;
        out += hexTable[c];
      }

      if (++i === len)
        break outer;

      c = StringPrototypeCharCodeAt(str, i);
    }

    if (lastPos < i)
      out += StringPrototypeSlice(str, lastPos, i);

    // Multi-byte characters ...
    if (c < 0x800) {
      lastPos = i + 1;
      out += hexTable[0xC0 | (c >> 6)] +
             hexTable[0x80 | (c & 0x3F)];
      continue;
    }
    if (c < 0xD800 || c >= 0xE000) {
      lastPos = i + 1;
      out += hexTable[0xE0 | (c >> 12)] +
             hexTable[0x80 | ((c >> 6) & 0x3F)] +
             hexTable[0x80 | (c & 0x3F)];
      continue;
    }
    // Surrogate pair
    ++i;

    // This branch should never happen because all URLSearchParams entries
    // should already be converted to USVString. But, included for
    // completion's sake anyway.
    if (i >= len)
      throw new ERR_INVALID_URI();

    const c2 = StringPrototypeCharCodeAt(str, i) & 0x3FF;

    lastPos = i + 1;
    c = 0x10000 + (((c & 0x3FF) << 10) | c2);
    out += hexTable[0xF0 | (c >> 18)] +
           hexTable[0x80 | ((c >> 12) & 0x3F)] +
           hexTable[0x80 | ((c >> 6) & 0x3F)] +
           hexTable[0x80 | (c & 0x3F)];
  }
  if (lastPos === 0)
    return str;
  if (lastPos < len)
    return out + StringPrototypeSlice(str, lastPos);
  return out;
}

module.exports = {
  encodeStr,
  hexTable,
  isHexTable,
};