Fix #112

peglib.h

@@ -1762,6 +1762,7 @@ struct AssignIDToDefinition : public Ope::Visitor {
   void visit(Holder &ope) override;
   void visit(Reference &ope) override;
   void visit(Whitespace &ope) override { ope.ope_->accept(*this); }
+  void visit(PrecedenceClimbing &ope) override;
 
   std::unordered_map<void *, size_t> ids;
 };
@@ -2733,6 +2734,11 @@ inline void AssignIDToDefinition::visit(Reference &ope) {
   }
 }
 
+inline void AssignIDToDefinition::visit(PrecedenceClimbing &ope) {
+  ope.atom_->accept(*this);
+  ope.binop_->accept(*this);
+}
+
 inline void TokenChecker::visit(WeakHolder & /*ope*/) { has_rule_ = true; }
 
 inline void TokenChecker::visit(Reference &ope) {

test/test2.cc

@@ -325,6 +325,24 @@ TEST_CASE("Packrat parser test with macro", "[packrat]")
     REQUIRE(ret == true);
 }
 
+TEST_CASE("Packrat parser test with precedence expression parser", "[packrat]") {
+  peg::parser parser(R"(
+    Expression  <- Atom (Operator Atom)* { precedence L + - L * / }
+    Atom        <- _? Number _?
+    Number      <- [0-9]+
+    Operator    <- '+' / '-' / '*' / '/'
+    _           <- ' '+
+  )");
+
+  bool ret = parser;
+  REQUIRE(ret == true);
+
+  parser.enable_packrat_parsing();
+
+  ret = parser.parse(" 1 + 2 * 3 ");
+  REQUIRE(ret == true);
+}
+
 TEST_CASE("Backreference test", "[backreference]")
 {
     parser parser(R"(