Op crate for Web APIs (#6906)

Co-authored-by: Ryan Dahl <ry@tinyclouds.org>

1 files changed, 243 insertions, 0 deletions

diff --git a/op_crates/web/text_encoding_test.js b/op_crates/web/text_encoding_test.js
new file mode 100644
index 000000000..f741fe409
--- /dev/null
+++ b/op_crates/web/text_encoding_test.js
@@ -0,0 +1,243 @@
+// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
+function assert(cond) {
+  if (!cond) {
+    throw Error("assert");
+  }
+}
+
+function assertArrayEquals(a1, a2) {
+  if (a1.length !== a2.length) throw Error("assert");
+
+  for (const index in a1) {
+    if (a1[index] !== a2[index]) {
+      throw Error("assert");
+    }
+  }
+}
+
+function btoaSuccess() {
+  const text = "hello world";
+  const encoded = btoa(text);
+  assert(encoded === "aGVsbG8gd29ybGQ=");
+}
+
+function atobSuccess() {
+  const encoded = "aGVsbG8gd29ybGQ=";
+  const decoded = atob(encoded);
+  assert(decoded === "hello world");
+}
+
+function atobWithAsciiWhitespace() {
+  const encodedList = [
+    " aGVsbG8gd29ybGQ=",
+    "  aGVsbG8gd29ybGQ=",
+    "aGVsbG8gd29ybGQ= ",
+    "aGVsbG8gd29ybGQ=\n",
+    "aGVsbG\t8gd29ybGQ=",
+    `aGVsbG\t8g
+                d29ybGQ=`,
+  ];
+
+  for (const encoded of encodedList) {
+    const decoded = atob(encoded);
+    assert(decoded === "hello world");
+  }
+}
+
+function atobThrows() {
+  let threw = false;
+  try {
+    atob("aGVsbG8gd29ybGQ==");
+  } catch (e) {
+    threw = true;
+  }
+  assert(threw);
+}
+
+function atobThrows2() {
+  let threw = false;
+  try {
+    atob("aGVsbG8gd29ybGQ===");
+  } catch (e) {
+    threw = true;
+  }
+  assert(threw);
+}
+
+function btoaFailed() {
+  let threw = false;
+  const text = "你好";
+  try {
+    btoa(text);
+  } catch (e) {
+    assert(e instanceof TypeError);
+    threw = true;
+  }
+  assert(threw);
+}
+
+function textDecoder2() {
+  // deno-fmt-ignore
+  const fixture = new Uint8Array([
+    0xf0, 0x9d, 0x93, 0xbd,
+    0xf0, 0x9d, 0x93, 0xae,
+    0xf0, 0x9d, 0x94, 0x81,
+    0xf0, 0x9d, 0x93, 0xbd
+  ]);
+  const decoder = new TextDecoder();
+  assert(decoder.decode(fixture) === "𝓽𝓮𝔁𝓽");
+}
+
+function textDecoderIgnoreBOM() {
+  // deno-fmt-ignore
+  const fixture = new Uint8Array([
+    0xef, 0xbb, 0xbf,
+    0xf0, 0x9d, 0x93, 0xbd,
+    0xf0, 0x9d, 0x93, 0xae,
+    0xf0, 0x9d, 0x94, 0x81,
+    0xf0, 0x9d, 0x93, 0xbd
+  ]);
+  const decoder = new TextDecoder("utf-8", { ignoreBOM: true });
+  assert(decoder.decode(fixture) === "𝓽𝓮𝔁𝓽");
+}
+
+function textDecoderNotBOM() {
+  // deno-fmt-ignore
+  const fixture = new Uint8Array([
+    0xef, 0xbb, 0x89,
+    0xf0, 0x9d, 0x93, 0xbd,
+    0xf0, 0x9d, 0x93, 0xae,
+    0xf0, 0x9d, 0x94, 0x81,
+    0xf0, 0x9d, 0x93, 0xbd
+  ]);
+  const decoder = new TextDecoder("utf-8", { ignoreBOM: true });
+  assert(decoder.decode(fixture) === "ﻉ𝓽𝓮𝔁𝓽");
+}
+
+function textDecoderASCII() {
+  const fixture = new Uint8Array([0x89, 0x95, 0x9f, 0xbf]);
+  const decoder = new TextDecoder("ascii");
+  assert(decoder.decode(fixture) === "‰•Ÿ¿");
+}
+
+function textDecoderErrorEncoding() {
+  let didThrow = false;
+  try {
+    new TextDecoder("foo");
+  } catch (e) {
+    didThrow = true;
+    assert(e.message === "The encoding label provided ('foo') is invalid.");
+  }
+  assert(didThrow);
+}
+
+function textEncoder() {
+  const fixture = "𝓽𝓮𝔁𝓽";
+  const encoder = new TextEncoder();
+  // deno-fmt-ignore
+  assertArrayEquals(Array.from(encoder.encode(fixture)), [
+    0xf0, 0x9d, 0x93, 0xbd,
+    0xf0, 0x9d, 0x93, 0xae,
+    0xf0, 0x9d, 0x94, 0x81,
+    0xf0, 0x9d, 0x93, 0xbd
+  ]);
+}
+
+function textEncodeInto() {
+  const fixture = "text";
+  const encoder = new TextEncoder();
+  const bytes = new Uint8Array(5);
+  const result = encoder.encodeInto(fixture, bytes);
+  assert(result.read === 4);
+  assert(result.written === 4);
+  // deno-fmt-ignore
+  assertArrayEquals(Array.from(bytes), [
+    0x74, 0x65, 0x78, 0x74, 0x00,
+  ]);
+}
+
+function textEncodeInto2() {
+  const fixture = "𝓽𝓮𝔁𝓽";
+  const encoder = new TextEncoder();
+  const bytes = new Uint8Array(17);
+  const result = encoder.encodeInto(fixture, bytes);
+  assert(result.read === 8);
+  assert(result.written === 16);
+  // deno-fmt-ignore
+  assertArrayEquals(Array.from(bytes), [
+    0xf0, 0x9d, 0x93, 0xbd,
+    0xf0, 0x9d, 0x93, 0xae,
+    0xf0, 0x9d, 0x94, 0x81,
+    0xf0, 0x9d, 0x93, 0xbd, 0x00,
+  ]);
+}
+
+function textEncodeInto3() {
+  const fixture = "𝓽𝓮𝔁𝓽";
+  const encoder = new TextEncoder();
+  const bytes = new Uint8Array(5);
+  const result = encoder.encodeInto(fixture, bytes);
+  assert(result.read === 2);
+  assert(result.written === 4);
+  // deno-fmt-ignore
+  assertArrayEquals(Array.from(bytes), [
+    0xf0, 0x9d, 0x93, 0xbd, 0x00,
+  ]);
+}
+
+function textDecoderSharedUint8Array() {
+  const ab = new SharedArrayBuffer(6);
+  const dataView = new DataView(ab);
+  const charCodeA = "A".charCodeAt(0);
+  for (let i = 0; i < ab.byteLength; i++) {
+    dataView.setUint8(i, charCodeA + i);
+  }
+  const ui8 = new Uint8Array(ab);
+  const decoder = new TextDecoder();
+  const actual = decoder.decode(ui8);
+  assert(actual === "ABCDEF");
+}
+
+function textDecoderSharedInt32Array() {
+  const ab = new SharedArrayBuffer(8);
+  const dataView = new DataView(ab);
+  const charCodeA = "A".charCodeAt(0);
+  for (let i = 0; i < ab.byteLength; i++) {
+    dataView.setUint8(i, charCodeA + i);
+  }
+  const i32 = new Int32Array(ab);
+  const decoder = new TextDecoder();
+  const actual = decoder.decode(i32);
+  assert(actual === "ABCDEFGH");
+}
+
+function toStringShouldBeWebCompatibility() {
+  const encoder = new TextEncoder();
+  assert(encoder.toString() === "[object TextEncoder]");
+
+  const decoder = new TextDecoder();
+  assert(decoder.toString() === "[object TextDecoder]");
+}
+
+function main() {
+  btoaSuccess();
+  atobSuccess();
+  atobWithAsciiWhitespace();
+  atobThrows();
+  atobThrows2();
+  btoaFailed();
+  textDecoder2();
+  textDecoderIgnoreBOM();
+  textDecoderNotBOM();
+  textDecoderASCII();
+  textDecoderErrorEncoding();
+  textEncoder();
+  textEncodeInto();
+  textEncodeInto2();
+  textEncodeInto3();
+  textDecoderSharedUint8Array();
+  textDecoderSharedInt32Array();
+  toStringShouldBeWebCompatibility();
+}
+
+main();