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LibRegex: Support ECMA-262 Unicode escapes of the form "\u{code_point}"
When the Unicode flag is set, regular expressions may escape code points by surrounding the hexadecimal code point with curly braces, e.g. \u{41} is the character "A". When the Unicode flag is not set, this should be considered a repetition symbol - \u{41} is the character "u" repeated 41 times. This is left as a TODO for now.
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@ -7,6 +7,7 @@
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#include "RegexParser.h"
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#include "RegexDebug.h"
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#include <AK/CharacterTypes.h>
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#include <AK/String.h>
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#include <AK/StringBuilder.h>
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#include <AK/StringUtils.h>
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@ -1440,6 +1441,26 @@ bool ECMA262Parser::parse_atom_escape(ByteCode& stack, size_t& match_length_mini
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}
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if (try_skip("u")) {
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if (match(TokenType::LeftCurly)) {
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consume();
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if (!unicode) {
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// FIXME: In non-Unicode mode, this should be parsed as a repetition symbol (repeating the 'u').
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TODO();
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}
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auto code_point = read_digits(ReadDigitsInitialZeroState::Allow, true, 6);
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if (code_point.has_value() && is_unicode(*code_point) && match(TokenType::RightCurly)) {
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consume();
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match_length_minimum += 1;
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stack.insert_bytecode_compare_values({ { CharacterCompareType::Char, (ByteCodeValueType)code_point.value() } });
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return true;
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}
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set_error(Error::InvalidPattern);
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return false;
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}
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if (auto code_point = read_digits(ReadDigitsInitialZeroState::Allow, true, 4); code_point.has_value()) {
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// In Unicode mode, we need to combine surrogate pairs into a single code point. But we also need to be
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// rather forgiving if the surrogate pairs are invalid. So if a second code unit follows this code unit,
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