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LibWeb: Add TextEncoder encodeInto
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parent
f1ead552ce
commit
0104225d9b
Notes:
sideshowbarker
2024-07-17 11:34:34 +09:00
Author: https://github.com/bplaat
Commit: 0104225d9b
Pull-request: https://github.com/SerenityOS/serenity/pull/21351
9 changed files with 123 additions and 10 deletions
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@ -30,10 +30,9 @@ void TextEncoder::initialize(JS::Realm& realm)
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}
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// https://encoding.spec.whatwg.org/#dom-textencoder-encode
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JS::Uint8Array* TextEncoder::encode(String const& input) const
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JS::NonnullGCPtr<JS::Uint8Array> TextEncoder::encode(String const& input) const
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{
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// NOTE: The AK::DeprecatedString returned from PrimitiveString::string() is always UTF-8, regardless of the internal string type, so most of these steps are no-ops.
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// NOTE: The AK::String is always UTF-8, so most of these steps are no-ops.
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// 1. Convert input to an I/O queue of scalar values.
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// 2. Let output be the I/O queue of bytes « end-of-queue ».
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// 3. While true:
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@ -48,10 +47,67 @@ JS::Uint8Array* TextEncoder::encode(String const& input) const
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return JS::Uint8Array::create(realm(), array_length, *array_buffer);
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}
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// https://encoding.spec.whatwg.org/#dom-textencoder-encodeinto
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TextEncoderEncodeIntoResult TextEncoder::encode_into(String const& source, JS::Handle<JS::Object> const& destination) const
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{
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auto& destination_array = static_cast<JS::Uint8Array&>(*destination);
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auto data = destination_array.data();
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// 1. Let read be 0.
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unsigned long long read = 0;
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// 2. Let written be 0.
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unsigned long long written = 0;
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// NOTE: The AK::String is always UTF-8, so most of these steps are no-ops.
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// 3. Let encoder be an instance of the UTF-8 encoder.
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// 4. Let unused be the I/O queue of scalar values « end-of-queue ».
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// 5. Convert source to an I/O queue of scalar values.
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auto code_points = source.code_points();
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auto it = code_points.begin();
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// 6. While true:
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while (true) {
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// 6.1. Let item be the result of reading from source.
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// 6.2. Let result be the result of running encoder’s handler on unused and item.
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// 6.3. If result is finished, then break.
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if (it.done())
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break;
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auto item = *it;
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auto result = it.underlying_code_point_bytes();
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// 6.4. Otherwise:
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// 6.4.1. If destination’s byte length − written is greater than or equal to the number of bytes in result, then:
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if (data.size() - written >= result.size()) {
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// 6.4.1.1. If item is greater than U+FFFF, then increment read by 2.
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if (item > 0xffff) {
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read += 2;
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}
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// 6.4.1.2. Otherwise, increment read by 1.
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else {
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read++;
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}
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// 6.4.1.3. Write the bytes in result into destination, with startingOffset set to written.
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// 6.4.1.4. Increment written by the number of bytes in result.
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for (auto byte : result)
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data[written++] = byte;
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}
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// 6.4.2. Otherwise, break.
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else {
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break;
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}
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++it;
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}
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// 7. Return «[ "read" → read, "written" → written ]».
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return { read, written };
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}
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// https://encoding.spec.whatwg.org/#dom-textencoder-encoding
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FlyString const& TextEncoder::encoding()
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{
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static const FlyString encoding = "utf-8"_fly_string;
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static FlyString const encoding = "utf-8"_fly_string;
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return encoding;
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}
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