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Precedence climbing feature support
This commit is contained in:
yhirose
parent
29cd967975
commit
038bc06343
265
peglib.h
265
peglib.h
@ -532,6 +532,7 @@ private:
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friend class Sequence;
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friend class PrioritizedChoice;
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friend class Holder;
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friend class PrecedenceClimbing;
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const char *s_ = nullptr;
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size_t n_ = 0;
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@ -671,63 +672,63 @@ private:
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typedef std::function<any(SemanticValues &sv, any &dt)> Fty;
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template <typename F, typename R>
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Fty make_adaptor(F fn, R (F::* /*mf*/)(SemanticValues &sv) const) {
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Fty make_adaptor(F fn, R (F::*)(SemanticValues &sv) const) {
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return TypeAdaptor_sv<R>(fn);
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}
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template <typename F, typename R>
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Fty make_adaptor(F fn, R (F::* /*mf*/)(const SemanticValues &sv) const) {
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Fty make_adaptor(F fn, R (F::*)(const SemanticValues &sv) const) {
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return TypeAdaptor_csv<R>(fn);
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}
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template <typename F, typename R>
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Fty make_adaptor(F fn, R (F::* /*mf*/)(SemanticValues &sv)) {
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Fty make_adaptor(F fn, R (F::*)(SemanticValues &sv)) {
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return TypeAdaptor_sv<R>(fn);
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}
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template <typename F, typename R>
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Fty make_adaptor(F fn, R (F::* /*mf*/)(const SemanticValues &sv)) {
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Fty make_adaptor(F fn, R (F::*)(const SemanticValues &sv)) {
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return TypeAdaptor_csv<R>(fn);
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}
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template <typename F, typename R>
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Fty make_adaptor(F fn, R (*/*mf*/)(SemanticValues &sv)) {
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Fty make_adaptor(F fn, R (*)(SemanticValues &sv)) {
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return TypeAdaptor_sv<R>(fn);
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}
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template <typename F, typename R>
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Fty make_adaptor(F fn, R (*/*mf*/)(const SemanticValues &sv)) {
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Fty make_adaptor(F fn, R (*)(const SemanticValues &sv)) {
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return TypeAdaptor_csv<R>(fn);
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}
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template <typename F, typename R>
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Fty make_adaptor(F fn, R (F::* /*mf*/)(SemanticValues &sv, any &dt) const) {
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Fty make_adaptor(F fn, R (F::*)(SemanticValues &sv, any &dt) const) {
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return TypeAdaptor_sv_dt<R>(fn);
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}
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template <typename F, typename R>
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Fty make_adaptor(F fn,
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R (F::* /*mf*/)(const SemanticValues &sv, any &dt) const) {
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R (F::*)(const SemanticValues &sv, any &dt) const) {
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return TypeAdaptor_csv_dt<R>(fn);
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}
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template <typename F, typename R>
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Fty make_adaptor(F fn, R (F::* /*mf*/)(SemanticValues &sv, any &dt)) {
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Fty make_adaptor(F fn, R (F::*)(SemanticValues &sv, any &dt)) {
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return TypeAdaptor_sv_dt<R>(fn);
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}
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template <typename F, typename R>
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Fty make_adaptor(F fn, R (F::* /*mf*/)(const SemanticValues &sv, any &dt)) {
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Fty make_adaptor(F fn, R (F::*)(const SemanticValues &sv, any &dt)) {
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return TypeAdaptor_csv_dt<R>(fn);
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}
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template <typename F, typename R>
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Fty make_adaptor(F fn, R (*/*mf*/)(SemanticValues &sv, any &dt)) {
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Fty make_adaptor(F fn, R (*)(SemanticValues &sv, any &dt)) {
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return TypeAdaptor_sv_dt<R>(fn);
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}
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template <typename F, typename R>
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Fty make_adaptor(F fn, R (*/*mf*/)(const SemanticValues &sv, any &dt)) {
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Fty make_adaptor(F fn, R (*)(const SemanticValues &sv, any &dt)) {
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return TypeAdaptor_csv_dt<R>(fn);
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}
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@ -1529,6 +1530,32 @@ public:
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std::string name_;
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};
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class PrecedenceClimbing : public Ope {
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public:
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using BinOpeInfo = std::map<std::string, std::pair<size_t, char>>;
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PrecedenceClimbing(const std::shared_ptr<Ope> &atom,
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const std::shared_ptr<Ope> &binop, const BinOpeInfo &info,
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const Action &action)
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: atom_(atom), binop_(binop), info_(info), action_(action) {}
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size_t parse_core(const char *s, size_t n, SemanticValues &sv, Context &c,
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any &dt) const override {
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return parse_expression(s, n, sv, c, dt, 0);
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}
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void accept(Visitor &v) override;
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std::shared_ptr<Ope> atom_;
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std::shared_ptr<Ope> binop_;
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BinOpeInfo info_;
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const Action &action_;
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private:
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size_t parse_expression(const char *s, size_t n, SemanticValues &sv,
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Context &c, any &dt, size_t min_prec) const;
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};
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/*
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* Factories
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*/
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@ -1630,6 +1657,13 @@ inline std::shared_ptr<Ope> bkr(const std::string &name) {
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return std::make_shared<BackReference>(name);
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}
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inline std::shared_ptr<Ope> pre(const std::shared_ptr<Ope> &atom,
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const std::shared_ptr<Ope> &binop,
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const PrecedenceClimbing::BinOpeInfo &info,
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const Action &action) {
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return std::make_shared<PrecedenceClimbing>(atom, binop, info, action);
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}
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/*
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* Visitor
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*/
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@ -1656,6 +1690,7 @@ struct Ope::Visitor {
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virtual void visit(Reference & /*ope*/) {}
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virtual void visit(Whitespace & /*ope*/) {}
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virtual void visit(BackReference & /*ope*/) {}
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virtual void visit(PrecedenceClimbing & /*ope*/) {}
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};
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struct IsReference : public Ope::Visitor {
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@ -1685,6 +1720,7 @@ struct TraceOpeName : public Ope::Visitor {
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void visit(Reference &ope) override { name = "Reference"; }
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void visit(Whitespace &ope) override { name = "Whitespace"; }
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void visit(BackReference &ope) override { name = "BackReference"; }
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void visit(PrecedenceClimbing &ope) override { name = "PrecedenceClimbing"; }
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const char *name = nullptr;
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};
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@ -1758,6 +1794,7 @@ struct TokenChecker : public Ope::Visitor {
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void visit(WeakHolder &ope) override { ope.weak_.lock()->accept(*this); }
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void visit(Reference &ope) override;
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void visit(Whitespace &ope) override { ope.ope_->accept(*this); }
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void visit(PrecedenceClimbing &ope) override { ope.atom_->accept(*this); }
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static bool is_token(Ope &ope) {
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if (IsLiteralToken::check(ope)) { return true; }
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@ -1829,6 +1866,7 @@ struct DetectLeftRecursion : public Ope::Visitor {
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void visit(Reference &ope) override;
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void visit(Whitespace &ope) override { ope.ope_->accept(*this); }
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void visit(BackReference & /*ope*/) override { done_ = true; }
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void visit(PrecedenceClimbing &ope) override { ope.atom_->accept(*this); }
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const char *error_s = nullptr;
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@ -1878,6 +1916,7 @@ struct HasEmptyElement : public Ope::Visitor {
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void visit(Holder &ope) override { ope.ope_->accept(*this); }
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void visit(Reference &ope) override;
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void visit(Whitespace &ope) override { ope.ope_->accept(*this); }
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void visit(PrecedenceClimbing &ope) override { ope.atom_->accept(*this); }
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bool is_empty = false;
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const char *error_s = nullptr;
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@ -1938,6 +1977,7 @@ struct DetectInfiniteLoop : public Ope::Visitor {
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void visit(Holder &ope) override { ope.ope_->accept(*this); }
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void visit(Reference &ope) override;
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void visit(Whitespace &ope) override { ope.ope_->accept(*this); }
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void visit(PrecedenceClimbing &ope) override { ope.atom_->accept(*this); }
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bool has_error = false;
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const char *error_s = nullptr;
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@ -1975,6 +2015,7 @@ struct ReferenceChecker : public Ope::Visitor {
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void visit(Holder &ope) override { ope.ope_->accept(*this); }
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void visit(Reference &ope) override;
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void visit(Whitespace &ope) override { ope.ope_->accept(*this); }
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void visit(PrecedenceClimbing &ope) override { ope.atom_->accept(*this); }
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std::unordered_map<std::string, const char *> error_s;
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std::unordered_map<std::string, std::string> error_message;
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@ -2011,6 +2052,7 @@ struct LinkReferences : public Ope::Visitor {
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void visit(Holder &ope) override { ope.ope_->accept(*this); }
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void visit(Reference &ope) override;
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void visit(Whitespace &ope) override { ope.ope_->accept(*this); }
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void visit(PrecedenceClimbing &ope) override { ope.atom_->accept(*this); }
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private:
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Grammar &grammar_;
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@ -2089,6 +2131,10 @@ struct FindReference : public Ope::Visitor {
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ope.ope_->accept(*this);
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found_ope = wsp(found_ope);
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}
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void visit(PrecedenceClimbing &ope) override {
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ope.atom_->accept(*this);
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found_ope = csc(found_ope);
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}
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std::shared_ptr<Ope> found_ope;
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@ -2250,9 +2296,11 @@ public:
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std::vector<std::string> params;
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TracerEnter tracer_enter;
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TracerLeave tracer_leave;
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bool disable_action = false;
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private:
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friend class Reference;
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friend class ParserGenerator;
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Definition &operator=(const Definition &rhs);
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Definition &operator=(Definition &&rhs);
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@ -2471,7 +2519,7 @@ inline size_t Holder::parse_core(const char *s, size_t n, SemanticValues &sv,
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}
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inline any Holder::reduce(SemanticValues &sv, any &dt) const {
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if (outer_->action) {
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if (outer_->action && !outer_->disable_action) {
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return outer_->action(sv, dt);
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} else if (sv.empty()) {
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return any();
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@ -2523,7 +2571,8 @@ inline std::shared_ptr<Ope> Reference::get_core_operator() const {
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inline size_t BackReference::parse_core(const char *s, size_t n,
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SemanticValues &sv, Context &c,
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any &dt) const {
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for (int i = c.capture_scope_stack_size - 1; i >= 0; i--) {
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auto size = static_cast<int>(c.capture_scope_stack_size);
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for (auto i = size - 1; i >= 0; i--) {
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const auto &cs = c.capture_scope_stack[i];
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if (cs.find(name_) != cs.end()) {
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const auto &lit = cs.at(name_);
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@ -2535,6 +2584,87 @@ inline size_t BackReference::parse_core(const char *s, size_t n,
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throw std::runtime_error("Invalid back reference...");
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}
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inline size_t PrecedenceClimbing::parse_expression(const char *s, size_t n,
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SemanticValues &sv,
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Context &c, any &dt,
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size_t min_prec) const {
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auto len = atom_->parse(s, n, sv, c, dt);
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if (fail(len)) { return len; }
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std::string tok;
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auto &rule = dynamic_cast<Reference &>(*binop_).rule_;
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auto action = rule->action;
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rule->action = [&](SemanticValues &sv, any &dt) -> any {
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tok = sv.token();
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if (action) {
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return action(sv, dt);
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} else if (!sv.empty()) {
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return sv[0];
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}
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return any();
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};
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auto action_se = make_scope_exit([&]() { rule->action = action; });
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auto save_error_pos = c.error_pos;
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auto i = len;
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while (i < n) {
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std::vector<any> save_values(sv.begin(), sv.end());
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auto save_tokens = sv.tokens;
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auto chv = c.push();
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auto chl = binop_->parse(s + i, n - i, chv, c, dt);
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c.pop();
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if (fail(chl)) {
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c.error_pos = save_error_pos;
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break;
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}
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auto it = info_.find(tok);
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if (it == info_.end()) { break; }
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auto level = std::get<0>(it->second);
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auto assoc = std::get<1>(it->second);
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if (level < min_prec) { break; }
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sv.emplace_back(std::move(chv[0]));
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i += chl;
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auto next_min_prec = level;
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if (assoc == 'L') { next_min_prec = level + 1; }
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chv = c.push();
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chl = parse_expression(s + i, n - i, chv, c, dt, next_min_prec);
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c.pop();
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if (fail(chl)) {
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sv.assign(save_values.begin(), save_values.end());
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sv.tokens = save_tokens;
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c.error_pos = save_error_pos;
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break;
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}
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sv.emplace_back(std::move(chv[0]));
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i += chl;
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any val;
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if (action_) {
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sv.s_ = s;
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sv.n_ = i;
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val = action_(sv, dt);
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} else if (!sv.empty()) {
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val = sv[0];
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}
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sv.clear();
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sv.emplace_back(std::move(val));
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}
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return i;
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}
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inline void Sequence::accept(Visitor &v) { v.visit(*this); }
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inline void PrioritizedChoice::accept(Visitor &v) { v.visit(*this); }
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inline void ZeroOrMore::accept(Visitor &v) { v.visit(*this); }
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@ -2556,6 +2686,7 @@ inline void Holder::accept(Visitor &v) { v.visit(*this); }
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inline void Reference::accept(Visitor &v) { v.visit(*this); }
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inline void Whitespace::accept(Visitor &v) { v.visit(*this); }
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inline void BackReference::accept(Visitor &v) { v.visit(*this); }
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inline void PrecedenceClimbing::accept(Visitor &v) { v.visit(*this); }
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inline void AssignIDToDefinition::visit(Holder &ope) {
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auto p = static_cast<void *>(ope.outer_);
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@ -2717,11 +2848,17 @@ private:
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setup_actions();
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}
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struct Instruction {
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std::string type;
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any data;
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};
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struct Data {
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std::shared_ptr<Grammar> grammar;
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std::string start;
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const char *start_pos = nullptr;
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std::vector<std::pair<std::string, const char *>> duplicates;
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std::map<std::string, Instruction> instructions;
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Data() : grammar(std::make_shared<Grammar>()) {}
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};
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@ -2731,9 +2868,9 @@ private:
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g["Grammar"] <= seq(g["Spacing"], oom(g["Definition"]), g["EndOfFile"]);
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g["Definition"] <=
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cho(seq(g["Ignore"], g["IdentCont"], g["Parameters"], g["LEFTARROW"],
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g["Expression"]),
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seq(g["Ignore"], g["Identifier"], g["LEFTARROW"], g["Expression"]));
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g["Expression"], opt(g["Instruction"])),
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seq(g["Ignore"], g["Identifier"], g["LEFTARROW"], g["Expression"],
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opt(g["Instruction"])));
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g["Expression"] <= seq(g["Sequence"], zom(seq(g["SLASH"], g["Sequence"])));
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g["Sequence"] <= zom(g["Prefix"]);
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g["Prefix"] <= seq(opt(cho(g["AND"], g["NOT"])), g["Suffix"]);
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@ -2826,6 +2963,27 @@ private:
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zom(seq(g["COMMA"], g["Expression"])), g["CLOSE"]);
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~g["COMMA"] <= seq(chr(','), g["Spacing"]);
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// Instruction grammars
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g["Instruction"] <=
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seq(g["BeginBlacket"], cho(g["PrecedenceClimbing"]), g["EndBlacket"]);
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~g["SpacesZom"] <= zom(g["Space"]);
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~g["SpacesOom"] <= oom(g["Space"]);
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~g["BeginBlacket"] <= seq(chr('{'), g["Spacing"]);
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~g["EndBlacket"] <= seq(chr('}'), g["Spacing"]);
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// PrecedenceClimbing instruction
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g["PrecedenceClimbing"] <=
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seq(lit("precedence"), g["SpacesZom"], g["PrecedenceInfo"],
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zom(seq(g["SpacesOom"], g["PrecedenceInfo"])), g["SpacesZom"]);
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g["PrecedenceInfo"] <=
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seq(g["PrecedenceAssoc"],
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oom(seq(ign(g["SpacesOom"]), g["PrecedenceOpe"])));
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g["PrecedenceOpe"] <=
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tok(oom(
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seq(npd(cho(g["PrecedenceAssoc"], g["Space"], chr('}'))), dot())));
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g["PrecedenceAssoc"] <= cls("LR");
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// Set definition names
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for (auto &x : g) {
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x.second.name = x.first;
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@ -2834,6 +2992,8 @@ private:
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void setup_actions() {
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g["Definition"] = [&](const SemanticValues &sv, any &dt) {
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Data &data = *any_cast<Data *>(dt);
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auto is_macro = sv.choice() == 0;
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auto ignore = any_cast<bool>(sv[0]);
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auto name = any_cast<std::string>(sv[1]);
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@ -2843,12 +3003,16 @@ private:
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if (is_macro) {
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params = any_cast<std::vector<std::string>>(sv[2]);
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ope = any_cast<std::shared_ptr<Ope>>(sv[4]);
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if (sv.size() == 6) {
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data.instructions[name] = any_cast<Instruction>(sv[5]);
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}
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} else {
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ope = any_cast<std::shared_ptr<Ope>>(sv[3]);
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if (sv.size() == 5) {
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data.instructions[name] = any_cast<Instruction>(sv[4]);
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}
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}
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Data &data = *any_cast<Data *>(dt);
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auto &grammar = *data.grammar;
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if (!grammar.count(name)) {
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||||
auto &rule = grammar[name];
|
||||
@ -2928,8 +3092,7 @@ private:
|
||||
}
|
||||
};
|
||||
|
||||
g["Primary"] = [&](const SemanticValues &sv,
|
||||
any &dt) -> std::shared_ptr<Ope> {
|
||||
g["Primary"] = [&](const SemanticValues &sv, any &dt) {
|
||||
Data &data = *any_cast<Data *>(dt);
|
||||
|
||||
switch (sv.choice()) {
|
||||
@ -2944,10 +3107,13 @@ private:
|
||||
args = any_cast<std::vector<std::shared_ptr<Ope>>>(sv[2]);
|
||||
}
|
||||
|
||||
std::shared_ptr<Ope> ope =
|
||||
ref(*data.grammar, ident, sv.c_str(), is_macro, args);
|
||||
|
||||
if (ignore) {
|
||||
return ign(ref(*data.grammar, ident, sv.c_str(), is_macro, args));
|
||||
return ign(ope);
|
||||
} else {
|
||||
return ref(*data.grammar, ident, sv.c_str(), is_macro, args);
|
||||
return ope;
|
||||
}
|
||||
}
|
||||
case 2: { // (Expression)
|
||||
@ -3036,6 +3202,29 @@ private:
|
||||
g["Arguments"] = [](const SemanticValues &sv) {
|
||||
return sv.transform<std::shared_ptr<Ope>>();
|
||||
};
|
||||
|
||||
g["PrecedenceClimbing"] = [](const SemanticValues &sv) {
|
||||
PrecedenceClimbing::BinOpeInfo binOpeInfo;
|
||||
size_t level = 1;
|
||||
for (auto v : sv) {
|
||||
auto tokens = any_cast<std::vector<std::string>>(v);
|
||||
auto assoc = tokens[0][0];
|
||||
for (size_t i = 1; i < tokens.size(); i++) {
|
||||
const auto &tok = tokens[i];
|
||||
binOpeInfo[tok] = std::make_pair(level, assoc);
|
||||
}
|
||||
level++;
|
||||
}
|
||||
Instruction instruction;
|
||||
instruction.type = "precedence";
|
||||
instruction.data = binOpeInfo;
|
||||
return instruction;
|
||||
};
|
||||
g["PrecedenceInfo"] = [](const SemanticValues &sv) {
|
||||
return sv.transform<std::string>();
|
||||
};
|
||||
g["PrecedenceOpe"] = [](const SemanticValues &sv) { return sv.token(); };
|
||||
g["PrecedenceAssoc"] = [](const SemanticValues &sv) { return sv.token(); };
|
||||
}
|
||||
|
||||
std::shared_ptr<Grammar> perform_core(const char *s, size_t n,
|
||||
@ -3170,6 +3359,33 @@ private:
|
||||
(*data.grammar)[WORD_DEFINITION_NAME].get_core_operator();
|
||||
}
|
||||
|
||||
// Apply instructions
|
||||
for (const auto &item : data.instructions) {
|
||||
const auto &name = item.first;
|
||||
const auto &instruction = item.second;
|
||||
|
||||
if (instruction.type == "precedence") {
|
||||
auto &rule = grammar[name];
|
||||
|
||||
auto &seq = dynamic_cast<Sequence &>(*rule.get_core_operator());
|
||||
auto &atom = seq.opes_[0];
|
||||
auto &seq1 = dynamic_cast<Sequence &>(
|
||||
*dynamic_cast<ZeroOrMore &>(*seq.opes_[1]).ope_);
|
||||
auto &binop = seq1.opes_[0];
|
||||
auto &atom1 = seq1.opes_[1];
|
||||
|
||||
if (atom != atom1) {
|
||||
// TODO: check
|
||||
}
|
||||
|
||||
const auto &info =
|
||||
any_cast<PrecedenceClimbing::BinOpeInfo>(instruction.data);
|
||||
|
||||
rule.holder_->ope_ = pre(atom, binop, info, rule.action);
|
||||
rule.disable_action = true;
|
||||
}
|
||||
}
|
||||
|
||||
// Set root definition
|
||||
start = data.start;
|
||||
|
||||
@ -3241,7 +3457,6 @@ template <typename Annotation> struct AstBase : public Annotation {
|
||||
template <typename T>
|
||||
void ast_to_s_core(const std::shared_ptr<T> &ptr, std::string &s, int level,
|
||||
std::function<std::string(const T &ast, int level)> fn) {
|
||||
|
||||
const auto &ast = *ptr;
|
||||
for (auto i = 0; i < level; i++) {
|
||||
s += " ";
|
||||
@ -3266,7 +3481,6 @@ template <typename T>
|
||||
std::string
|
||||
ast_to_s(const std::shared_ptr<T> &ptr,
|
||||
std::function<std::string(const T &ast, int level)> fn = nullptr) {
|
||||
|
||||
std::string s;
|
||||
ast_to_s_core(ptr, s, 0, fn);
|
||||
return s;
|
||||
@ -3280,7 +3494,6 @@ struct AstOptimizer {
|
||||
template <typename T>
|
||||
std::shared_ptr<T> optimize(std::shared_ptr<T> original,
|
||||
std::shared_ptr<T> parent = nullptr) {
|
||||
|
||||
auto found = std::find(filters_.begin(), filters_.end(), original->name) !=
|
||||
filters_.end();
|
||||
bool opt = optimize_nodes_ ? !found : found;
|
||||
|
||||
60
test/test.cc
60
test/test.cc
@ -201,6 +201,66 @@ TEST_CASE("String capture test", "[general]")
|
||||
|
||||
using namespace peg;
|
||||
|
||||
TEST_CASE("Precedence climbing", "[precedence]")
|
||||
{
|
||||
// Create a PEG parser
|
||||
parser parser(R"(
|
||||
# Grammar for simple calculator...
|
||||
START <- _ EXPRESSION
|
||||
EXPRESSION <- ATOM (OPERATOR ATOM)* {
|
||||
precedence
|
||||
L + -
|
||||
L * /
|
||||
}
|
||||
ATOM <- NUMBER / T('(') EXPRESSION T(')')
|
||||
OPERATOR <- T([-+/*])
|
||||
NUMBER <- T('-'? [0-9]+)
|
||||
~_ <- [ \t]*
|
||||
T(S) <- < S > _
|
||||
)");
|
||||
|
||||
// Setup actions
|
||||
auto reduce = [](const SemanticValues& sv) -> long {
|
||||
auto result = any_cast<long>(sv[0]);
|
||||
for (auto i = 1u; i < sv.size(); i += 2) {
|
||||
auto num = any_cast<long>(sv[i + 1]);
|
||||
auto ope = any_cast<char>(sv[i]);
|
||||
switch (ope) {
|
||||
case '+': result += num; break;
|
||||
case '-': result -= num; break;
|
||||
case '*': result *= num; break;
|
||||
case '/': result /= num; break;
|
||||
}
|
||||
}
|
||||
return result;
|
||||
};
|
||||
|
||||
parser["EXPRESSION"] = reduce;
|
||||
parser["OPERATOR"] = [](const SemanticValues& sv) { return static_cast<char>(*sv.c_str()); };
|
||||
parser["NUMBER"] = [](const SemanticValues& sv) { return atol(sv.c_str()); };
|
||||
|
||||
bool ret = parser;
|
||||
REQUIRE(ret == true);
|
||||
|
||||
{
|
||||
auto expr = " 1 + 2 * 3 * (4 - 5 + 6) / 7 - 8 ";
|
||||
long val = 0;
|
||||
ret = parser.parse(expr, val);
|
||||
|
||||
REQUIRE(ret == true);
|
||||
REQUIRE(val == -3);
|
||||
}
|
||||
|
||||
{
|
||||
auto expr = "-1+-2--3"; // -1 + -2 - -3 = 0
|
||||
long val = 0;
|
||||
ret = parser.parse(expr, val);
|
||||
|
||||
REQUIRE(ret == true);
|
||||
REQUIRE(val == 0);
|
||||
}
|
||||
}
|
||||
|
||||
TEST_CASE("String capture test2", "[general]")
|
||||
{
|
||||
std::vector<std::string> tags;
|
||||
|
||||
Loading…
Reference in New Issue
Block a user