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LibRegex: Make '.' reject matching LF / LS / PS as per the ECMA262 spec
Previously we allowed it to match those, but the ECMA262 spec disallows these (except in DotAll).
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parent
1e022295c4
commit
936a9fd759
4 changed files with 59 additions and 43 deletions
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@ -697,6 +697,7 @@ TEST_CASE(ECMA262_match)
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{ "^[a-sy-z]$"sv, "b"sv, true, ECMAScriptFlags::Insensitive },
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{ "^[a-sy-z]$"sv, "y"sv, true, ECMAScriptFlags::Insensitive },
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{ "^[a-sy-z]$"sv, "u"sv, false, ECMAScriptFlags::Insensitive },
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{ "."sv, "\n\r\u2028\u2029"sv, false }, // Dot should not match any of CR/LF/LS/PS in ECMA262 mode without DotAll.
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};
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// clang-format on
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@ -50,5 +50,6 @@ enum __RegexAllFlags {
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__Regex_Internal_Stateful = __Regex_Global << 16, // Internal flag; enables stateful matches.
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__Regex_Internal_BrowserExtended = __Regex_Global << 17, // Internal flag; enable browser-specific ECMA262 extensions.
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__Regex_Internal_ConsiderNewline = __Regex_Global << 18, // Internal flag; allow matchers to consider newlines as line separators.
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__Regex_Last = __Regex_UnicodeSets,
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__Regex_Internal_ECMA262DotSemantics = __Regex_Global << 19, // Internal flag; use ECMA262 semantics for dot ('.') - disallow CR/LF/LS/PS instead of just CR.
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__Regex_Last = __Regex_Internal_ECMA262DotSemantics,
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};
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@ -499,8 +499,18 @@ ALWAYS_INLINE ExecutionResult OpCode_Compare::execute(MatchInput const& input, M
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if (input.view.length() <= state.string_position)
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return ExecutionResult::Failed_ExecuteLowPrioForks;
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// U+2028 LINE SEPARATOR
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constexpr static u32 const LineSeparator { 0x2028 };
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// U+2029 PARAGRAPH SEPARATOR
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constexpr static u32 const ParagraphSeparator { 0x2029 };
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auto input_view = input.view.substring_view(state.string_position, 1)[0];
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if (input_view != '\n' || (input.regex_options.has_flag_set(AllFlags::SingleLine) && input.regex_options.has_flag_set(AllFlags::Internal_ConsiderNewline))) {
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auto is_equivalent_to_newline = input_view == '\n'
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|| (input.regex_options.has_flag_set(AllFlags::Internal_ECMA262DotSemantics)
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? (input_view == '\r' || input_view == LineSeparator || input_view == ParagraphSeparator)
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: false);
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if (!is_equivalent_to_newline || (input.regex_options.has_flag_set(AllFlags::SingleLine) && input.regex_options.has_flag_set(AllFlags::Internal_ConsiderNewline))) {
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if (current_inversion_state())
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inverse_matched = true;
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else
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@ -19,6 +19,7 @@ namespace regex {
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using FlagsUnderlyingType = u32;
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enum class AllFlags {
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Default = 0,
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Global = __Regex_Global, // All matches (don't return after first match)
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Insensitive = __Regex_Insensitive, // Case insensitive match (ignores case of [a-zA-Z])
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Ungreedy = __Regex_Ungreedy, // The match becomes lazy by default. Now a ? following a quantifier makes it greedy
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@ -38,10 +39,12 @@ enum class AllFlags {
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Internal_Stateful = __Regex_Internal_Stateful, // Make global matches match one result at a time, and further match() calls on the same instance continue where the previous one left off.
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Internal_BrowserExtended = __Regex_Internal_BrowserExtended, // Only for ECMA262, Enable the behaviors defined in section B.1.4. of the ECMA262 spec.
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Internal_ConsiderNewline = __Regex_Internal_ConsiderNewline, // Only for ECMA262, Allow multiline matches to consider newlines as line boundaries.
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Internal_ECMA262DotSemantics = __Regex_Internal_ECMA262DotSemantics, // Use ECMA262 dot semantics: disallow matching CR/LF/LS/PS instead of just CR.
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Last = Internal_BrowserExtended,
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};
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enum class PosixFlags : FlagsUnderlyingType {
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Default = 0,
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Global = (FlagsUnderlyingType)AllFlags::Global,
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Insensitive = (FlagsUnderlyingType)AllFlags::Insensitive,
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Ungreedy = (FlagsUnderlyingType)AllFlags::Ungreedy,
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@ -58,6 +61,7 @@ enum class PosixFlags : FlagsUnderlyingType {
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};
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enum class ECMAScriptFlags : FlagsUnderlyingType {
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Default = (FlagsUnderlyingType)AllFlags::Internal_ECMA262DotSemantics,
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Global = (FlagsUnderlyingType)AllFlags::Global | (FlagsUnderlyingType)AllFlags::Internal_Stateful, // Note: ECMAScript "Global" creates a stateful regex.
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Insensitive = (FlagsUnderlyingType)AllFlags::Insensitive,
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Ungreedy = (FlagsUnderlyingType)AllFlags::Ungreedy,
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@ -80,13 +84,13 @@ public:
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RegexOptions() = default;
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constexpr RegexOptions(T flags)
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: m_flags(flags)
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: m_flags(static_cast<T>(to_underlying(flags) | to_underlying(T::Default)))
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{
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}
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template<class U>
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constexpr RegexOptions(RegexOptions<U> other)
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: m_flags((T) static_cast<FlagsUnderlyingType>(other.value()))
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: RegexOptions(static_cast<T>(to_underlying(other.value())))
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{
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}
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@ -115,7 +119,7 @@ public:
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T value() const { return m_flags; }
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private:
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T m_flags { 0 };
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T m_flags { T::Default };
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};
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template<class T>
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