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LibRegex: Implement section B.1.4. of the ECMA262 spec

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This allows the parser to deal with crazy patterns like the one
in #5517.
This commit is contained in:
AnotherTest 2021-02-26 22:49:34 +03:30 • committed by Andreas Kling
parent ce5fe2a6e8
commit f05e518cbc
7 changed files with 382 additions and 91 deletions
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18
Userland/Libraries/LibRegex/Tests/Regex.cpp
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@ -501,6 +501,8 @@ TEST_CASE(ECMA262_parse)
{ "\\u1234", regex::Error::NoError, regex::ECMAScriptFlags::Unicode },
{ "[\\u1234]", regex::Error::NoError, regex::ECMAScriptFlags::Unicode },
{ ",(?", regex::Error::InvalidCaptureGroup }, // #4583
{ "{1}", regex::Error::InvalidPattern },
{ "{1,2}", regex::Error::InvalidPattern },
};
for (auto& test : tests) {
@ -525,7 +527,7 @@ TEST_CASE(ECMA262_match)
bool matches { true };
ECMAScriptFlags options {};
};
// clang-format off
constexpr _test tests[] {
{ "^hello.$", "hello1" },
{ "^(hello.)$", "hello1" },
@ -547,7 +549,21 @@ TEST_CASE(ECMA262_match)
{ "bar.*(?<!foo)", "barbar", true },
{ "((...)X)+", "fooXbarXbazX", true },
{ "(?:)", "", true },
// ECMA262, B.1.4. Regular Expression Pattern extensions for browsers
{ "{", "{", true, ECMAScriptFlags::BrowserExtended },
{ "\\5", "\5", true, ECMAScriptFlags::BrowserExtended },
{ "\\05", "\5", true, ECMAScriptFlags::BrowserExtended },
{ "\\455", "\45""5", true, ECMAScriptFlags::BrowserExtended },
{ "\\314", "\314", true, ECMAScriptFlags::BrowserExtended },
{ "\\cf", "\06", true, ECMAScriptFlags::BrowserExtended },
{ "\\c1", "\\c1", true, ECMAScriptFlags::BrowserExtended },
{ "[\\c1]", "\x11", true, ECMAScriptFlags::BrowserExtended },
{ "[\\w-\\d]", "-", true, ECMAScriptFlags::BrowserExtended },
{ "^(?:^^\\.?|[!+-]|!=|!==|#|%|%=|&|&&|&&=|&=|\\(|\\*|\\*=|\\+=|,|-=|->|\\/|\\/=|:|::|;|<|<<|<<=|<=|=|==|===|>|>=|>>|>>=|>>>|>>>=|[?@[^]|\\^=|\\^\\^|\\^\\^=|{|\\||\\|=|\\|\\||\\|\\|=|~|break|case|continue|delete|do|else|finally|instanceof|return|throw|try|typeof)\\s*(\\/(?=[^*/])(?:[^/[\\\\]|\\\\[\\S\\s]|\\[(?:[^\\\\\\]]|\\\\[\\S\\s])*(?:]|$))+\\/)",
"return /xx/", true, ECMAScriptFlags::BrowserExtended
}, // #5517, appears to be matching JS expressions that involve regular expressions...
};
// clang-format on
for (auto& test : tests) {
Regex<ECMA262> re(test.pattern, test.options);