factor the snazzy string matcher code that Daniel hates
out of AsmMatcherEmitter.cpp into its own class.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@113137 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/utils/TableGen/StringMatcher.h b/utils/TableGen/StringMatcher.h
new file mode 100644
index 0000000..7987820
--- /dev/null
+++ b/utils/TableGen/StringMatcher.h
@@ -0,0 +1,54 @@
+//===- StringMatcher.h - Generate a matcher for input strings ---*- C++ -*-===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements the StringMatcher class.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef STRINGMATCHER_H
+#define STRINGMATCHER_H
+
+#include <vector>
+#include <string>
+#include <utility>
+#include "llvm/ADT/StringRef.h"
+
+namespace llvm {
+ class raw_ostream;
+
+/// StringMatcher - Given a list of strings and code to execute when they match,
+/// output a simple switch tree to classify the input string.
+///
+/// If a match is found, the code in Vals[i].second is executed; control must
+/// not exit this code fragment. If nothing matches, execution falls through.
+///
+class StringMatcher {
+public:
+ typedef std::pair<std::string, std::string> StringPair;
+private:
+ StringRef StrVariableName;
+ const std::vector<StringPair> &Matches;
+ raw_ostream &OS;
+
+public:
+ StringMatcher(StringRef strVariableName,
+ const std::vector<StringPair> &matches, raw_ostream &os)
+ : StrVariableName(strVariableName), Matches(matches), OS(os) {}
+
+ void Emit() const;
+
+
+private:
+ bool EmitStringMatcherForChar(const std::vector<const StringPair*> &Matches,
+ unsigned CharNo, unsigned IndentCount) const;
+};
+
+} // end llvm namespace.
+
+#endif