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LibRegex: Support ECMA-262 Unicode escapes of the form "\u{code_point}"

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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.
This commit is contained in:
Timothy Flynn 2021-07-22 09:25:58 -04:00 • committed by Linus Groh
parent 0e6375558d
commit 345ef6abba
2 changed files with 27 additions and 0 deletions
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6
Tests/LibRegex/Regex.cpp
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@ -510,6 +510,11 @@ TEST_CASE(ECMA262_parse)
{ "\\uxxxx", regex::Error::InvalidPattern, ECMAScriptFlags::Unicode },
{ "\\ud83d", regex::Error::NoError, ECMAScriptFlags::Unicode },
{ "\\ud83d\\uxxxx", regex::Error::InvalidPattern, ECMAScriptFlags::Unicode },
{ "\\u{0}", regex::Error::NoError, ECMAScriptFlags::Unicode },
{ "\\u{10ffff}", regex::Error::NoError, ECMAScriptFlags::Unicode },
{ "\\u{10ffff", regex::Error::InvalidPattern, ECMAScriptFlags::Unicode },
{ "\\u{10ffffx", regex::Error::InvalidPattern, ECMAScriptFlags::Unicode },
{ "\\u{110000}", regex::Error::InvalidPattern, ECMAScriptFlags::Unicode },
};
for (auto& test : tests) {
@ -605,6 +610,7 @@ TEST_CASE(ECMA262_unicode_match)
{ "\\ude00", "😀", false, ECMAScriptFlags::Unicode },
{ "\\ud83d\\ude00", "😀", true },
{ "\\ud83d\\ude00", "😀", true, ECMAScriptFlags::Unicode },
{ "\\u{1f600}", "😀", true, ECMAScriptFlags::Unicode },
{ "\\ud83d\\ud83d", "\xed\xa0\xbd\xed\xa0\xbd", true },
{ "\\ud83d\\ud83d", "\xed\xa0\xbd\xed\xa0\xbd", true, ECMAScriptFlags::Unicode },
};