add antlr source code and ReadMeHEADmain

1 files changed, 39 insertions, 0 deletions

diff --git a/antlr4-cpp-runtime-4.9.2-source/runtime/src/atn/PredicateTransition.h b/antlr4-cpp-runtime-4.9.2-source/runtime/src/atn/PredicateTransition.h
new file mode 100644
index 0000000..4d9b420
--- /dev/null
+++ b/antlr4-cpp-runtime-4.9.2-source/runtime/src/atn/PredicateTransition.h
@@ -0,0 +1,39 @@
+/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.
+ * Use of this file is governed by the BSD 3-clause license that
+ * can be found in the LICENSE.txt file in the project root.
+ */
+
+#pragma once
+
+#include "atn/AbstractPredicateTransition.h"
+#include "SemanticContext.h"
+
+namespace antlr4 {
+namespace atn {
+
+  /// TODO: this is old comment:
+  ///  A tree of semantic predicates from the grammar AST if label==SEMPRED.
+  ///  In the ATN, labels will always be exactly one predicate, but the DFA
+  ///  may have to combine a bunch of them as it collects predicates from
+  ///  multiple ATN configurations into a single DFA state.
+  class ANTLR4CPP_PUBLIC PredicateTransition final : public AbstractPredicateTransition {
+  public:
+    const size_t ruleIndex;
+    const size_t predIndex;
+    const bool isCtxDependent; // e.g., $i ref in pred
+
+    PredicateTransition(ATNState *target, size_t ruleIndex, size_t predIndex, bool isCtxDependent);
+
+    virtual SerializationType getSerializationType() const override;
+
+    virtual bool isEpsilon() const override;
+    virtual bool matches(size_t symbol, size_t minVocabSymbol, size_t maxVocabSymbol) const override;
+
+    Ref<SemanticContext::Predicate> getPredicate() const;
+
+    virtual std::string toString() const override;
+
+  };
+
+} // namespace atn
+} // namespace antlr4