695 lines
24 KiB
C++
695 lines
24 KiB
C++
#ifndef regex_impl_hh_INCLUDED
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#define regex_impl_hh_INCLUDED
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#include "exception.hh"
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#include "flags.hh"
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#include "ref_ptr.hh"
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#include "unicode.hh"
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#include "utf8.hh"
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#include "vector.hh"
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#include "utils.hh"
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namespace Kakoune
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{
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struct regex_error : runtime_error
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{
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using runtime_error::runtime_error;
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};
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enum class CharacterType : unsigned char
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{
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None = 0,
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Whitespace = 1 << 0,
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HorizontalWhitespace = 1 << 1,
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Word = 1 << 2,
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Digit = 1 << 3,
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NotWhitespace = 1 << 4,
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NotHorizontalWhitespace = 1 << 5,
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NotWord = 1 << 6,
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NotDigit = 1 << 7
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};
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constexpr bool with_bit_ops(Meta::Type<CharacterType>) { return true; }
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struct CharacterClass
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{
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struct Range { Codepoint min, max; };
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Vector<Range, MemoryDomain::Regex> ranges;
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CharacterType ctypes = CharacterType::None;
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bool negative = false;
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bool ignore_case = false;
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};
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bool is_character_class(const CharacterClass& character_class, Codepoint cp);
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bool is_ctype(CharacterType ctype, Codepoint cp);
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struct CompiledRegex : RefCountable, UseMemoryDomain<MemoryDomain::Regex>
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{
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enum Op : char
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{
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Match,
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Literal,
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Literal_IgnoreCase,
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AnyChar,
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AnyCharExceptNewLine,
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Class,
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CharacterType,
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Jump,
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Split_PrioritizeParent,
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Split_PrioritizeChild,
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Save,
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LineStart,
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LineEnd,
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WordBoundary,
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NotWordBoundary,
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SubjectBegin,
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SubjectEnd,
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LookAhead,
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NegativeLookAhead,
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LookBehind,
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NegativeLookBehind,
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LookAhead_IgnoreCase,
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NegativeLookAhead_IgnoreCase,
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LookBehind_IgnoreCase,
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NegativeLookBehind_IgnoreCase,
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};
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enum class Lookaround : Codepoint
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{
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OpBegin = 0xF0000,
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AnyChar = 0xF0000,
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AnyCharExceptNewLine = 0xF0001,
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CharacterClass = 0xF0002,
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CharacterType = 0xF8000,
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OpEnd = 0xFFFFF,
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EndOfLookaround = static_cast<Codepoint>(-1)
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};
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struct Instruction
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{
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Op op;
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// Those mutables are used during execution
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mutable bool scheduled;
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mutable uint16_t last_step;
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uint32_t param;
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};
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static_assert(sizeof(Instruction) == 8, "");
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explicit operator bool() const { return not instructions.empty(); }
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struct NamedCapture
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{
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String name;
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uint32_t index;
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};
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Vector<Instruction, MemoryDomain::Regex> instructions;
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Vector<CharacterClass, MemoryDomain::Regex> character_classes;
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Vector<Lookaround, MemoryDomain::Regex> lookarounds;
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Vector<NamedCapture, MemoryDomain::Regex> named_captures;
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uint32_t first_backward_inst; // -1 if no backward support, 0 if only backward, >0 if both forward and backward
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uint32_t save_count;
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struct StartDesc : UseMemoryDomain<MemoryDomain::Regex>
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{
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static constexpr Codepoint count = 128;
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static constexpr Codepoint other = 0;
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bool map[count];
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};
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std::unique_ptr<StartDesc> forward_start_desc;
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std::unique_ptr<StartDesc> backward_start_desc;
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};
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String dump_regex(const CompiledRegex& program);
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enum class RegexCompileFlags
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{
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None = 0,
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NoSubs = 1 << 0,
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Optimize = 1 << 1,
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Backward = 1 << 2,
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NoForward = 1 << 3,
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};
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constexpr bool with_bit_ops(Meta::Type<RegexCompileFlags>) { return true; }
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CompiledRegex compile_regex(StringView re, RegexCompileFlags flags);
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enum class RegexExecFlags
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{
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None = 0,
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NotBeginOfLine = 1 << 1,
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NotEndOfLine = 1 << 2,
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NotBeginOfWord = 1 << 3,
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NotEndOfWord = 1 << 4,
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NotInitialNull = 1 << 5,
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};
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constexpr bool with_bit_ops(Meta::Type<RegexExecFlags>) { return true; }
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enum class RegexMode
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{
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Forward = 1 << 0,
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Backward = 1 << 1,
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Search = 1 << 2,
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AnyMatch = 1 << 3,
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NoSaves = 1 << 4,
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};
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constexpr bool with_bit_ops(Meta::Type<RegexMode>) { return true; }
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constexpr bool has_direction(RegexMode mode)
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{
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return (bool)(mode & RegexMode::Forward) xor
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(bool)(mode & RegexMode::Backward);
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}
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constexpr bool is_direction(RegexMode mode)
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{
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return has_direction(mode) and
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(mode & ~(RegexMode::Forward | RegexMode::Backward)) == RegexMode{0};
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}
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template<typename It, typename=void>
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struct SentinelType { using Type = It; };
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template<typename It>
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struct SentinelType<It, void_t<typename It::Sentinel>> { using Type = typename It::Sentinel; };
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template<typename Iterator, RegexMode mode>
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class ThreadedRegexVM
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{
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public:
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ThreadedRegexVM(const CompiledRegex& program)
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: m_program{program}
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{
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kak_assert((forward and program.first_backward_inst != 0) or
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(not forward and program.first_backward_inst != -1));
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}
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ThreadedRegexVM(const ThreadedRegexVM&) = delete;
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ThreadedRegexVM& operator=(const ThreadedRegexVM&) = delete;
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~ThreadedRegexVM()
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{
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for (auto* saves : m_saves)
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{
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for (size_t i = m_program.save_count-1; i > 0; --i)
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saves->pos[i].~Iterator();
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saves->~Saves();
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operator delete(saves);
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}
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}
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bool exec(const Iterator& begin, const Iterator& end,
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const Iterator& subject_begin, const Iterator& subject_end,
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RegexExecFlags flags)
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{
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if (flags & RegexExecFlags::NotInitialNull and begin == end)
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return false;
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constexpr bool search = (mode & RegexMode::Search);
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ConstArrayView<CompiledRegex::Instruction> instructions{m_program.instructions};
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if (forward)
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instructions = instructions.subrange(0, m_program.first_backward_inst);
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else
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instructions = instructions.subrange(m_program.first_backward_inst);
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const ExecConfig config{
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Sentinel{forward ? begin : end},
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Sentinel{forward ? end : begin},
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Sentinel{subject_begin},
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Sentinel{subject_end},
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flags,
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instructions
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};
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Iterator start = forward ? begin : end;
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if (const auto& start_desc = forward ? m_program.forward_start_desc : m_program.backward_start_desc)
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{
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if (search)
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{
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to_next_start(start, config, *start_desc);
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if (start == config.end) // If start_desc is not null, it means we consume at least one char
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return false;
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}
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else if (start != config.end)
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{
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const Codepoint cp = codepoint(start, config);
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if (not start_desc->map[cp < StartDesc::count ? cp : StartDesc::other])
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return false;
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}
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}
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return exec_program(std::move(start), config);
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}
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ArrayView<const Iterator> captures() const
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{
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if (m_captures >= 0)
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return { m_saves[m_captures]->pos, m_program.save_count };
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return {};
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}
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private:
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struct Saves
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{
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int16_t refcount;
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int16_t next_free;
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Iterator pos[1];
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};
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template<bool copy>
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int16_t new_saves(Iterator* pos)
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{
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kak_assert(not copy or pos != nullptr);
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const auto count = m_program.save_count;
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if (m_first_free >= 0)
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{
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const int16_t res = m_first_free;
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Saves& saves = *m_saves[res];
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m_first_free = saves.next_free;
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kak_assert(saves.refcount == 1);
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if (copy)
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std::copy_n(pos, count, saves.pos);
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else
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std::fill_n(saves.pos, count, Iterator{});
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return res;
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}
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void* ptr = operator new (sizeof(Saves) + (count-1) * sizeof(Iterator));
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Saves* saves = new (ptr) Saves{1, 0, {copy ? pos[0] : Iterator{}}};
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for (size_t i = 1; i < count; ++i)
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new (&saves->pos[i]) Iterator{copy ? pos[i] : Iterator{}};
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m_saves.push_back(saves);
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return static_cast<int16_t>(m_saves.size() - 1);
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}
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void release_saves(int16_t index)
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{
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if (index < 0)
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return;
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auto& saves = *m_saves[index];
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if (saves.refcount == 1)
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{
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saves.next_free = m_first_free;
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m_first_free = index;
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}
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else
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--saves.refcount;
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};
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struct alignas(int32_t) Thread
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{
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int16_t inst;
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int16_t saves;
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};
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using StartDesc = CompiledRegex::StartDesc;
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using Sentinel = typename SentinelType<Iterator>::Type;
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struct ExecConfig
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{
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const Sentinel begin;
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const Sentinel end;
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const Sentinel subject_begin;
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const Sentinel subject_end;
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const RegexExecFlags flags;
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ConstArrayView<CompiledRegex::Instruction> instructions;
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};
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// Steps a thread until it consumes the current character, matches or fail
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void step_thread(const Iterator& pos, uint16_t current_step, Thread thread, const ExecConfig& config)
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{
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auto failed = [this, &thread]() {
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release_saves(thread.saves);
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};
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auto consumed = [this, &thread]() {
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if (m_program.instructions[thread.inst].scheduled)
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return release_saves(thread.saves);
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m_program.instructions[thread.inst].scheduled = true;
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m_threads.push_next(thread);
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};
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auto* instructions = m_program.instructions.data();
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while (true)
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{
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auto& inst = instructions[thread.inst++];
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// if this instruction was already executed for this step in another thread,
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// then this thread is redundant and can be dropped
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if (inst.last_step == current_step)
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return failed();
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inst.last_step = current_step;
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switch (inst.op)
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{
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case CompiledRegex::Literal:
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if (pos != config.end and inst.param == codepoint(pos, config))
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return consumed();
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return failed();
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case CompiledRegex::Literal_IgnoreCase:
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if (pos != config.end and inst.param == to_lower(codepoint(pos, config)))
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return consumed();
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return failed();
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case CompiledRegex::AnyChar:
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return consumed();
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case CompiledRegex::AnyCharExceptNewLine:
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if (pos != config.end and codepoint(pos, config) != '\n')
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return consumed();
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return failed();
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case CompiledRegex::Jump:
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thread.inst = static_cast<int16_t>(inst.param);
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break;
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case CompiledRegex::Split_PrioritizeParent:
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{
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if (thread.saves >= 0)
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++m_saves[thread.saves]->refcount;
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m_threads.push_current({static_cast<int16_t>(inst.param), thread.saves});
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break;
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}
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case CompiledRegex::Split_PrioritizeChild:
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{
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if (thread.saves >= 0)
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++m_saves[thread.saves]->refcount;
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m_threads.push_current({thread.inst, thread.saves});
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thread.inst = static_cast<uint16_t>(inst.param);
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break;
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}
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case CompiledRegex::Save:
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{
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if (mode & RegexMode::NoSaves)
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break;
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if (thread.saves < 0)
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thread.saves = new_saves<false>(nullptr);
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else if (m_saves[thread.saves]->refcount > 1)
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{
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--m_saves[thread.saves]->refcount;
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thread.saves = new_saves<true>(m_saves[thread.saves]->pos);
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}
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m_saves[thread.saves]->pos[inst.param] = pos;
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break;
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}
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case CompiledRegex::Class:
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if (pos == config.end)
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return failed();
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return is_character_class(m_program.character_classes[inst.param], codepoint(pos, config)) ?
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consumed() : failed();
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case CompiledRegex::CharacterType:
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if (pos == config.end)
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return failed();
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return is_ctype((CharacterType)inst.param, codepoint(pos, config)) ?
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consumed() : failed();
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case CompiledRegex::LineStart:
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if (not is_line_start(pos, config))
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return failed();
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break;
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case CompiledRegex::LineEnd:
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if (not is_line_end(pos, config))
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return failed();
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break;
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case CompiledRegex::WordBoundary:
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if (not is_word_boundary(pos, config))
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return failed();
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break;
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case CompiledRegex::NotWordBoundary:
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if (is_word_boundary(pos, config))
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return failed();
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break;
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case CompiledRegex::SubjectBegin:
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if (pos != config.subject_begin)
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return failed();
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break;
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case CompiledRegex::SubjectEnd:
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if (pos != config.subject_end)
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return failed();
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break;
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case CompiledRegex::LookAhead:
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case CompiledRegex::NegativeLookAhead:
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if (lookaround<true, false>(inst.param, pos, config) !=
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(inst.op == CompiledRegex::LookAhead))
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return failed();
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break;
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case CompiledRegex::LookAhead_IgnoreCase:
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case CompiledRegex::NegativeLookAhead_IgnoreCase:
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if (lookaround<true, true>(inst.param, pos, config) !=
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(inst.op == CompiledRegex::LookAhead_IgnoreCase))
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return failed();
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break;
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case CompiledRegex::LookBehind:
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case CompiledRegex::NegativeLookBehind:
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if (lookaround<false, false>(inst.param, pos, config) !=
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(inst.op == CompiledRegex::LookBehind))
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return failed();
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break;
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case CompiledRegex::LookBehind_IgnoreCase:
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case CompiledRegex::NegativeLookBehind_IgnoreCase:
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if (lookaround<false, true>(inst.param, pos, config) !=
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(inst.op == CompiledRegex::LookBehind_IgnoreCase))
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return failed();
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break;
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case CompiledRegex::Match:
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if ((pos != config.end and not (mode & RegexMode::Search)) or
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(config.flags & RegexExecFlags::NotInitialNull and pos == config.begin))
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return failed();
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release_saves(m_captures);
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m_captures = thread.saves;
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m_found_match = true;
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// remove lower priority threads
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while (not m_threads.current_is_empty())
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release_saves(m_threads.pop_current().saves);
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return;
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}
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}
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return failed();
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}
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bool exec_program(Iterator pos, const ExecConfig& config)
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{
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kak_assert(m_threads.current_is_empty() and m_threads.next_is_empty());
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release_saves(m_captures);
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m_captures = -1;
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m_threads.grow_ifn();
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const int16_t first_inst = forward ? 0 : m_program.first_backward_inst;
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m_threads.push_current({first_inst, -1});
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const auto& start_desc = forward ? m_program.forward_start_desc : m_program.backward_start_desc;
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constexpr bool search = mode & RegexMode::Search;
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constexpr bool any_match = mode & RegexMode::AnyMatch;
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uint16_t current_step = -1;
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m_found_match = false;
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while (true) // Iterate on all codepoints and once at the end
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{
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if (++current_step == 0)
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{
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// We wrapped, avoid potential collision on inst.last_step by resetting them
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for (auto& inst : config.instructions)
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inst.last_step = 0;
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current_step = 1; // step 0 is never valid
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}
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while (not m_threads.current_is_empty())
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step_thread(pos, current_step, m_threads.pop_current(), config);
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for (auto& thread : m_threads.next_threads())
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m_program.instructions[thread.inst].scheduled = false;
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if (pos == config.end or
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(m_threads.next_is_empty() and (not search or m_found_match)) or
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(m_found_match and any_match))
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{
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for (auto& t : m_threads.next_threads())
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release_saves(t.saves);
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m_threads.clear_next();
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return m_found_match;
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}
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forward ? utf8::to_next(pos, config.subject_end)
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: utf8::to_previous(pos, config.subject_begin);
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if (search)
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{
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if (start_desc and m_threads.next_is_empty())
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to_next_start(pos, config, *start_desc);
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m_threads.grow_ifn();
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m_threads.push_next({first_inst, -1});
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}
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m_threads.swap_next();
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}
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}
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void to_next_start(Iterator& start, const ExecConfig& config, const StartDesc& start_desc)
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{
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while (start != config.end)
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{
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const Codepoint cp = read_codepoint(start, config);
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if (start_desc.map[(cp >= 0 and cp < StartDesc::count) ? cp : StartDesc::other])
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{
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forward ? utf8::to_previous(start, config.subject_begin)
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: utf8::to_next(start, config.subject_end);
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return;
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}
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}
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}
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|
|
|
template<bool look_forward, bool ignore_case>
|
|
bool lookaround(uint32_t index, Iterator pos, const ExecConfig& config) const
|
|
{
|
|
using Lookaround = CompiledRegex::Lookaround;
|
|
|
|
if (not look_forward)
|
|
{
|
|
if (pos == config.subject_begin)
|
|
return m_program.lookarounds[index] == Lookaround::EndOfLookaround;
|
|
utf8::to_previous(pos, config.subject_begin);
|
|
}
|
|
|
|
for (auto it = m_program.lookarounds.begin() + index; *it != Lookaround::EndOfLookaround; ++it)
|
|
{
|
|
if (look_forward and pos == config.subject_end)
|
|
return false;
|
|
|
|
Codepoint cp = utf8::codepoint(pos, config.subject_end);
|
|
if (ignore_case)
|
|
cp = to_lower(cp);
|
|
|
|
const Lookaround op = *it;
|
|
if (op == Lookaround::AnyChar)
|
|
{} // any character matches
|
|
else if (op == Lookaround::AnyCharExceptNewLine)
|
|
{
|
|
if (cp == '\n')
|
|
return false;
|
|
}
|
|
else if (op >= Lookaround::CharacterClass and op < Lookaround::CharacterType)
|
|
{
|
|
auto index = to_underlying(op) - to_underlying(Lookaround::CharacterClass);
|
|
if (not is_character_class(m_program.character_classes[index], cp))
|
|
return false;
|
|
}
|
|
else if (op >= Lookaround::CharacterType and op < Lookaround::OpEnd)
|
|
{
|
|
auto ctype = static_cast<CharacterType>(to_underlying(op) & 0xFF);
|
|
if (not is_ctype(ctype, cp))
|
|
return false;
|
|
}
|
|
else if (static_cast<Codepoint>(op) != cp)
|
|
return false;
|
|
|
|
if (not look_forward and pos == config.subject_begin)
|
|
return *++it == Lookaround::EndOfLookaround;
|
|
|
|
look_forward ? utf8::to_next(pos, config.subject_end)
|
|
: utf8::to_previous(pos, config.subject_begin);
|
|
}
|
|
return true;
|
|
}
|
|
|
|
static bool is_line_start(const Iterator& pos, const ExecConfig& config)
|
|
{
|
|
if (pos == config.subject_begin)
|
|
return not (config.flags & RegexExecFlags::NotBeginOfLine);
|
|
return utf8::codepoint(utf8::previous(pos, config.subject_begin), config.subject_end) == '\n';
|
|
}
|
|
|
|
static bool is_line_end(const Iterator& pos, const ExecConfig& config)
|
|
{
|
|
if (pos == config.subject_end)
|
|
return not (config.flags & RegexExecFlags::NotEndOfLine);
|
|
return utf8::codepoint(pos, config.subject_end) == '\n';
|
|
}
|
|
|
|
static bool is_word_boundary(const Iterator& pos, const ExecConfig& config)
|
|
{
|
|
if (pos == config.subject_begin)
|
|
return not (config.flags & RegexExecFlags::NotBeginOfWord);
|
|
if (pos == config.subject_end)
|
|
return not (config.flags & RegexExecFlags::NotEndOfWord);
|
|
return is_word(utf8::codepoint(utf8::previous(pos, config.subject_begin), config.subject_end)) !=
|
|
is_word(utf8::codepoint(pos, config.subject_end));
|
|
}
|
|
|
|
static Codepoint read_codepoint(Iterator& it, const ExecConfig& config)
|
|
{
|
|
if (forward)
|
|
return utf8::read_codepoint(it, config.subject_end);
|
|
else
|
|
{
|
|
utf8::to_previous(it, config.subject_begin);
|
|
return utf8::codepoint(it, config.subject_end);
|
|
}
|
|
}
|
|
|
|
static Codepoint codepoint(const Iterator& it, const ExecConfig& config)
|
|
{
|
|
return utf8::codepoint(forward ? it : utf8::previous(it, config.subject_begin),
|
|
config.subject_end);
|
|
}
|
|
|
|
const CompiledRegex& m_program;
|
|
|
|
struct DualThreadStack
|
|
{
|
|
DualThreadStack() = default;
|
|
DualThreadStack(const DualThreadStack&) = delete;
|
|
~DualThreadStack() { delete[] m_data; }
|
|
|
|
bool current_is_empty() const { return m_current == 0; }
|
|
bool next_is_empty() const { return m_next == m_capacity; }
|
|
|
|
void push_current(Thread thread) { kak_assert(m_current < m_next); m_data[m_current++] = thread; grow_ifn(); }
|
|
Thread pop_current() { kak_assert(m_current > 0); return m_data[--m_current]; }
|
|
|
|
void push_next(Thread thread) { kak_assert(m_current < m_next); m_data[--m_next] = thread; }
|
|
void clear_next() { m_next = m_capacity; }
|
|
ConstArrayView<Thread> next_threads() const { return { m_data + m_next, m_data + m_capacity }; }
|
|
|
|
void swap_next()
|
|
{
|
|
kak_assert(m_next < m_capacity);
|
|
const int32_t count = m_capacity - m_next;
|
|
std::copy_n(m_data + m_next, count, m_data);
|
|
m_current = count;
|
|
m_next = m_capacity;
|
|
}
|
|
|
|
void grow_ifn()
|
|
{
|
|
if (m_current != m_next)
|
|
return;
|
|
const auto new_capacity = m_capacity ? m_capacity * 2 : 4;
|
|
const auto next_count = m_capacity - m_next;
|
|
const auto new_next = new_capacity - next_count;
|
|
Thread* new_data = new Thread[new_capacity];
|
|
std::copy_n(m_data, m_current, new_data);
|
|
std::copy_n(m_data + m_next, next_count, new_data + new_next);
|
|
delete[] m_data;
|
|
m_data = new_data;
|
|
m_capacity = new_capacity;
|
|
m_next = new_next;
|
|
}
|
|
|
|
private:
|
|
Thread* m_data = nullptr;
|
|
int32_t m_capacity = 0; // Maximum capacity should be 2*instruction count, so 65536
|
|
int32_t m_current = 0;
|
|
int32_t m_next = 0;
|
|
};
|
|
|
|
static_assert(has_direction(mode));
|
|
static constexpr bool forward = mode & RegexMode::Forward;
|
|
|
|
DualThreadStack m_threads;
|
|
Vector<Saves*, MemoryDomain::Regex> m_saves;
|
|
int16_t m_first_free = -1;
|
|
int16_t m_captures = -1;
|
|
bool m_found_match = false;
|
|
};
|
|
|
|
}
|
|
|
|
#endif // regex_impl_hh_INCLUDED
|