2017-09-17 10:50:53 +02:00
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#include "regex_impl.hh"
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#include "vector.hh"
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#include "unit_tests.hh"
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#include "string.hh"
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#include "exception.hh"
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2017-09-17 12:15:43 +02:00
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#include "array_view.hh"
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2017-09-17 10:50:53 +02:00
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namespace Kakoune
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{
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namespace RegexProgram
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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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AnyChar,
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Jump,
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Split,
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LineStart,
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LineEnd,
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};
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using Offset = size_t;
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}
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namespace RegexCompiler
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{
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enum class Quantifier
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{
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One,
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Optional,
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RepeatZeroOrMore,
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RepeatOneOrMore
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};
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enum class Op
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{
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Literal,
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AnyChar,
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Sequence,
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Alternation,
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LineStart,
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LineEnd,
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};
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struct AstNode
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{
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Op op;
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char value;
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Quantifier quantifier;
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Vector<std::unique_ptr<AstNode>> children;
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};
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using AstNodePtr = std::unique_ptr<AstNode>;
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AstNodePtr make_ast_node(Op op, char value = 0,
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Quantifier quantifier = Quantifier::One)
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{
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return AstNodePtr{new AstNode{op, value, quantifier, {}}};
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}
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template<typename Iterator>
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struct Parser
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{
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static AstNodePtr parse(Iterator pos, Iterator end)
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{
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return disjunction(pos, end);
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}
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private:
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static AstNodePtr disjunction(Iterator& pos, Iterator end)
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{
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AstNodePtr node = alternative(pos, end);
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if (pos == end or *pos != '|')
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return node;
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AstNodePtr res = make_ast_node(Op::Alternation);
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res->children.push_back(std::move(node));
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res->children.push_back(disjunction(++pos, end));
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return res;
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}
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static AstNodePtr alternative(Iterator& pos, Iterator end)
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{
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AstNodePtr res = make_ast_node(Op::Sequence);
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while (auto node = term(pos, end))
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res->children.push_back(std::move(node));
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return res;
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}
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static AstNodePtr term(Iterator& pos, Iterator end)
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{
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if (auto node = assertion(pos, end))
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return node;
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if (auto node = atom(pos, end))
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{
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node->quantifier = quantifier(pos, end);
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return node;
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}
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return nullptr;
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}
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static AstNodePtr assertion(Iterator& pos, Iterator end)
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{
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switch (*pos)
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{
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case '^': ++pos; return make_ast_node(Op::LineStart);
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case '$': ++pos; return make_ast_node(Op::LineEnd);
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/* TODO: \`, \', \b, \B, look ahead, look behind */
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}
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return nullptr;
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}
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static AstNodePtr atom(Iterator& pos, Iterator end)
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{
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const auto c = *pos;
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switch (c)
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{
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case '.': ++pos; return make_ast_node(Op::AnyChar);
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case '(':
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{
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++pos;
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auto content = disjunction(pos, end);
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if (pos == end or *pos != ')')
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throw runtime_error{"Unclosed parenthesis"};
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++pos;
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return content;
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}
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default:
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if (contains("^$.*+?()[]{}|", c))
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return nullptr;
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++pos;
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return make_ast_node(Op::Literal, c);
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}
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}
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static Quantifier quantifier(Iterator& pos, Iterator end)
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{
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switch (*pos)
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{
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case '*': ++pos; return Quantifier::RepeatZeroOrMore;
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case '+': ++pos; return Quantifier::RepeatOneOrMore;
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case '?': ++pos; return Quantifier::Optional;
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default: return Quantifier::One;
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}
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}
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};
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RegexProgram::Offset compile_node(Vector<char>& program, const AstNodePtr& node)
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{
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RegexProgram::Offset pos = program.size();
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auto allow_none = [](Quantifier quantifier) {
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return quantifier == Quantifier::Optional or
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quantifier == Quantifier::RepeatZeroOrMore;
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};
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auto is_repeat = [](Quantifier quantifier) {
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return quantifier == Quantifier::RepeatZeroOrMore or
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quantifier == Quantifier::RepeatOneOrMore;
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};
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auto alloc_offset = [](Vector<char>& instructions) {
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auto pos = instructions.size();
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instructions.resize(instructions.size() + sizeof(RegexProgram::Offset));
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return pos;
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};
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auto get_offset = [](Vector<char>& instructions, RegexProgram::Offset base) -> RegexProgram::Offset& {
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return *reinterpret_cast<RegexProgram::Offset*>(&instructions[base]);
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};
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RegexProgram::Offset optional_offset = -1;
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if (allow_none(node->quantifier))
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{
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program.push_back(RegexProgram::Split);
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optional_offset = alloc_offset(program);
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}
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Vector<RegexProgram::Offset> goto_end_offsets;
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auto content_pos = program.size();
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switch (node->op)
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{
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case Op::Literal:
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program.push_back(RegexProgram::Literal);
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program.push_back(node->value);
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break;
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case Op::AnyChar:
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program.push_back(RegexProgram::AnyChar);
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break;
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case Op::Sequence:
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for (auto& child : node->children)
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compile_node(program, child);
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break;
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case Op::Alternation:
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{
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auto& children = node->children;
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kak_assert(children.size() == 2);
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program.push_back(RegexProgram::Split);
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auto offset = alloc_offset(program);
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compile_node(program, children[0]);
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program.push_back(RegexProgram::Jump);
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goto_end_offsets.push_back(alloc_offset(program));
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auto right_pos = compile_node(program, children[1]);
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get_offset(program, offset) = right_pos;
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break;
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}
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case Op::LineStart:
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program.push_back(RegexProgram::LineStart);
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break;
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case Op::LineEnd:
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program.push_back(RegexProgram::LineEnd);
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break;
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}
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for (auto& offset : goto_end_offsets)
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get_offset(program, offset) = program.size();
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if (is_repeat(node->quantifier))
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{
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program.push_back(RegexProgram::Split);
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get_offset(program, alloc_offset(program)) = content_pos;
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}
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if (optional_offset != -1)
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get_offset(program, optional_offset) = program.size();
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return pos;
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}
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Vector<char> compile(const AstNodePtr& node)
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{
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Vector<char> res;
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compile_node(res, node);
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res.push_back(RegexProgram::Match);
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return res;
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}
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template<typename Iterator>
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Vector<char> compile(Iterator begin, Iterator end)
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{
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return compile(Parser<Iterator>::parse(begin, end));
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}
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}
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namespace RegexProgram
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{
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void dump(ConstArrayView<char> program)
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{
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for (size_t pos = 0; pos < program.size(); )
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{
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printf("%4zd ", pos);
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switch ((RegexProgram::Op)program[pos++])
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{
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case RegexProgram::Literal:
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printf("literal %c\n", program[pos++]);
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break;
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case RegexProgram::AnyChar:
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printf("any char\n");
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break;
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case RegexProgram::Jump:
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printf("jump %zd\n", *reinterpret_cast<const RegexProgram::Offset*>(&program[pos]));
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pos += sizeof(RegexProgram::Offset);
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break;
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case RegexProgram::Split:
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{
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printf("split %zd\n", *reinterpret_cast<const RegexProgram::Offset*>(&program[pos]));
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pos += sizeof(RegexProgram::Offset);
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break;
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}
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case RegexProgram::LineStart:
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printf("line start\n");
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break;
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case RegexProgram::LineEnd:
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printf("line end\n");
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break;
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case RegexProgram::Match:
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printf("match\n");
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}
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}
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}
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struct ThreadedExecutor
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{
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ThreadedExecutor(ConstArrayView<char> program) : m_program{program} {}
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struct StepResult
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{
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enum Result { Consumed, Matched, Failed } result;
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const char* next = nullptr;
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};
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StepResult step(const char* inst)
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{
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while (true)
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{
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auto c = m_pos == m_subject.end() ? 0 : *m_pos;
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const RegexProgram::Op op = (RegexProgram::Op)*inst++;
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switch (op)
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{
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case RegexProgram::Literal:
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if (*inst++ == c)
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return { StepResult::Consumed, inst };
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return { StepResult::Failed };
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case RegexProgram::AnyChar:
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return { StepResult::Consumed, inst };
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case RegexProgram::Jump:
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inst = m_program.begin() + *reinterpret_cast<const RegexProgram::Offset*>(inst);
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break;
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case RegexProgram::Split:
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{
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m_threads.push_back(m_program.begin() + *reinterpret_cast<const RegexProgram::Offset*>(inst));
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inst += sizeof(RegexProgram::Offset);
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2017-09-17 12:48:23 +02:00
|
|
|
break;
|
|
|
|
}
|
|
|
|
case RegexProgram::LineStart:
|
|
|
|
if (not is_line_start())
|
|
|
|
return { StepResult::Failed };
|
|
|
|
break;
|
|
|
|
case RegexProgram::LineEnd:
|
|
|
|
if (not is_line_end())
|
|
|
|
return { StepResult::Failed };
|
|
|
|
break;
|
|
|
|
case RegexProgram::Match:
|
|
|
|
return { StepResult::Matched };
|
2017-09-17 10:50:53 +02:00
|
|
|
}
|
|
|
|
}
|
2017-09-17 12:48:23 +02:00
|
|
|
return { StepResult::Failed };
|
2017-09-17 12:15:43 +02:00
|
|
|
}
|
2017-09-17 10:50:53 +02:00
|
|
|
|
2017-09-17 12:48:23 +02:00
|
|
|
bool match(ConstArrayView<char> program, StringView data)
|
2017-09-17 10:50:53 +02:00
|
|
|
{
|
2017-09-17 12:48:23 +02:00
|
|
|
m_threads = Vector<const char*>{program.begin()};
|
|
|
|
m_subject = data;
|
|
|
|
m_pos = data.begin();
|
|
|
|
|
|
|
|
for (m_pos = m_subject.begin(); m_pos != m_subject.end(); ++m_pos)
|
2017-09-17 10:50:53 +02:00
|
|
|
{
|
2017-09-17 12:48:23 +02:00
|
|
|
for (int i = 0; i < m_threads.size(); ++i)
|
|
|
|
{
|
|
|
|
auto res = step(m_threads[i]);
|
|
|
|
m_threads[i] = res.next;
|
|
|
|
if (res.result == StepResult::Matched)
|
|
|
|
return true;
|
|
|
|
}
|
|
|
|
m_threads.erase(std::remove(m_threads.begin(), m_threads.end(), nullptr), m_threads.end());
|
|
|
|
if (m_threads.empty())
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
// Step remaining threads to see if they match without consuming anything else
|
|
|
|
for (int i = 0; i < m_threads.size(); ++i)
|
|
|
|
{
|
|
|
|
if (step(m_threads[i]).result == StepResult::Matched)
|
2017-09-17 12:15:43 +02:00
|
|
|
return true;
|
2017-09-17 10:50:53 +02:00
|
|
|
}
|
2017-09-17 12:48:23 +02:00
|
|
|
return false;
|
2017-09-17 10:50:53 +02:00
|
|
|
}
|
|
|
|
|
2017-09-17 12:48:23 +02:00
|
|
|
bool is_line_start() const
|
2017-09-17 10:50:53 +02:00
|
|
|
{
|
2017-09-17 12:48:23 +02:00
|
|
|
return m_pos == m_subject.begin() or *(m_pos-1) == '\n';
|
2017-09-17 10:50:53 +02:00
|
|
|
}
|
2017-09-17 12:48:23 +02:00
|
|
|
|
|
|
|
bool is_line_end() const
|
|
|
|
{
|
|
|
|
return m_pos == m_subject.end() or *m_pos == '\n';
|
|
|
|
}
|
|
|
|
|
|
|
|
ConstArrayView<char> m_program;
|
|
|
|
Vector<const char*> m_threads;
|
|
|
|
StringView m_subject;
|
|
|
|
const char* m_pos;
|
|
|
|
};
|
2017-09-17 12:15:43 +02:00
|
|
|
}
|
2017-09-17 10:50:53 +02:00
|
|
|
|
|
|
|
auto test_regex = UnitTest{[]{
|
2017-09-17 12:48:23 +02:00
|
|
|
using Exec = RegexProgram::ThreadedExecutor;
|
2017-09-17 12:15:43 +02:00
|
|
|
{
|
|
|
|
StringView re = "a*b";
|
|
|
|
auto program = RegexCompiler::compile(re.begin(), re.end());
|
|
|
|
RegexProgram::dump(program);
|
2017-09-17 12:48:23 +02:00
|
|
|
Exec exec{program};
|
|
|
|
kak_assert(exec.match(program, "b"));
|
|
|
|
kak_assert(exec.match(program, "ab"));
|
|
|
|
kak_assert(exec.match(program, "aaab"));
|
|
|
|
kak_assert(not exec.match(program, "acb"));
|
|
|
|
kak_assert(not exec.match(program, ""));
|
2017-09-17 12:15:43 +02:00
|
|
|
}
|
2017-09-17 13:12:46 +02:00
|
|
|
|
|
|
|
{
|
|
|
|
StringView re = "^a.*b$";
|
|
|
|
auto program = RegexCompiler::compile(re.begin(), re.end());
|
|
|
|
RegexProgram::dump(program);
|
|
|
|
Exec exec{program};
|
|
|
|
kak_assert(exec.match(program, "afoob"));
|
|
|
|
kak_assert(exec.match(program, "ab"));
|
|
|
|
kak_assert(not exec.match(program, "bab"));
|
|
|
|
kak_assert(not exec.match(program, ""));
|
|
|
|
}
|
|
|
|
|
2017-09-17 12:15:43 +02:00
|
|
|
{
|
2017-09-17 13:08:10 +02:00
|
|
|
StringView re = "^(foo|qux|baz)+(bar)?baz$";
|
2017-09-17 12:15:43 +02:00
|
|
|
auto program = RegexCompiler::compile(re.begin(), re.end());
|
|
|
|
RegexProgram::dump(program);
|
2017-09-17 12:48:23 +02:00
|
|
|
Exec exec{program};
|
|
|
|
kak_assert(exec.match(program, "fooquxbarbaz"));
|
2017-09-17 13:08:10 +02:00
|
|
|
kak_assert(not exec.match(program, "fooquxbarbaze"));
|
2017-09-17 12:48:23 +02:00
|
|
|
kak_assert(not exec.match(program, "quxbar"));
|
|
|
|
kak_assert(not exec.match(program, "blahblah"));
|
2017-09-17 13:08:10 +02:00
|
|
|
kak_assert(exec.match(program, "bazbaz"));
|
2017-09-17 12:48:23 +02:00
|
|
|
kak_assert(exec.match(program, "quxbaz"));
|
2017-09-17 12:15:43 +02:00
|
|
|
}
|
2017-09-17 10:50:53 +02:00
|
|
|
}};
|
|
|
|
|
|
|
|
}
|