1 files changed, 92 insertions, 0 deletions
diff --git a/ext/node/polyfills/internal/querystring.ts b/ext/node/polyfills/internal/querystring.ts
new file mode 100644
index 000000000..c00803afe
--- /dev/null
+++ b/ext/node/polyfills/internal/querystring.ts
@@ -0,0 +1,92 @@
+// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
+import { ERR_INVALID_URI } from "internal:deno_node/polyfills/internal/errors.ts";
+
+export const hexTable = new Array(256);
+for (let i = 0; i < 256; ++i) {
+  hexTable[i] = "%" + ((i < 16 ? "0" : "") + i.toString(16)).toUpperCase();
+}
+
+// deno-fmt-ignore
+export 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
+]);
+
+export function encodeStr(
+  str: string,
+  noEscapeTable: Int8Array,
+  hexTable: string[],
+): string {
+  const len = str.length;
+  if (len === 0) return "";
+
+  let out = "";
+  let lastPos = 0;
+
+  for (let i = 0; i < len; i++) {
+    let c = str.charCodeAt(i);
+    // ASCII
+    if (c < 0x80) {
+      if (noEscapeTable[c] === 1) continue;
+      if (lastPos < i) out += str.slice(lastPos, i);
+      lastPos = i + 1;
+      out += hexTable[c];
+      continue;
+    }
+
+    if (lastPos < i) out += str.slice(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 = str.charCodeAt(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 + str.slice(lastPos);
+  return out;
+}
+
+export default {
+  hexTable,
+  encodeStr,
+  isHexTable,
+};