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@ -108,6 +108,7 @@ impl BuiltIn for String {
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.name(Self::NAME) |
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.length(Self::LENGTH) |
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.property("length", 0, attribute) |
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.static_method(Self::raw, "raw", 1) |
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.static_method(Self::from_char_code, "fromCharCode", 1) |
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.method(Self::char_at, "charAt", 1) |
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.method(Self::char_code_at, "charCodeAt", 1) |
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@ -231,6 +232,78 @@ impl String {
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.ok_or_else(|| context.construct_type_error("'this' is not a string")) |
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} |
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/// `String.prototype.raw( template, ...substitutions )`
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///
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/// More information:
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/// - [ECMAScript reference][spec]
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/// - [MDN documentation][mdn]
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///
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/// [spec]: https://tc39.es/ecma262/#sec-string.raw
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/// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/raw
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pub(crate) fn raw(_: &JsValue, args: &[JsValue], context: &mut Context) -> JsResult<JsValue> { |
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let substitutions = args.get(1..).unwrap_or_default(); |
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// 1. Let numberOfSubstitutions be the number of elements in substitutions.
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let number_of_substitutions = substitutions.len(); |
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// 2. Let cooked be ? ToObject(template).
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let cooked = args.get_or_undefined(0).to_object(context)?; |
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// 3. Let raw be ? ToObject(? Get(cooked, "raw")).
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let raw = cooked.get("raw", context)?.to_object(context)?; |
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// 4. Let literalSegments be ? LengthOfArrayLike(raw).
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let literal_segments = raw.length_of_array_like(context)?; |
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// 5. If literalSegments ≤ 0, return the empty String.
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// This is not <= because a `usize` is always positive.
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if literal_segments == 0 { |
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return Ok(JsString::empty().into()); |
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} |
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// 6. Let stringElements be a new empty List.
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let mut string_elements = vec![]; |
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// 7. Let nextIndex be 0.
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let mut next_index = 0; |
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// 8. Repeat,
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loop { |
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// a. Let nextKey be ! ToString(𝔽(nextIndex)).
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let next_key = next_index; |
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// b. Let nextSeg be ? ToString(? Get(raw, nextKey)).
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let next_seg = raw.get(next_key, context)?.to_string(context)?; |
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// c. Append the code unit elements of nextSeg to the end of stringElements.
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string_elements.extend(next_seg.encode_utf16()); |
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// d. If nextIndex + 1 = literalSegments, then
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if next_index + 1 == literal_segments { |
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// i. Return the String value whose code units are the elements in the List stringElements.
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// If stringElements has no elements, the empty String is returned.
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return Ok(StdString::from_utf16_lossy(&string_elements).into()); |
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} |
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// e. If nextIndex < numberOfSubstitutions, let next be substitutions[nextIndex].
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let next = if next_index < number_of_substitutions { |
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substitutions.get_or_undefined(next_index).clone() |
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// f. Else, let next be the empty String.
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} else { |
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JsString::empty().into() |
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}; |
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// g. Let nextSub be ? ToString(next).
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let next_sub = next.to_string(context)?; |
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// h. Append the code unit elements of nextSub to the end of stringElements.
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string_elements.extend(next_sub.encode_utf16()); |
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// i. Set nextIndex to nextIndex + 1.
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next_index += 1; |
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} |
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} |
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/// `String.fromCharCode(...codePoints)`
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///
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/// Construct a `String` from one or more code points (as numbers).
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