LRParser

- Added old (non-task) parsing code, as a basis for the new parser.
- Added Tree object for parse trees.
- Added top-level entry point for testing.

src/parser/Parser.h

@@ -0,0 +1,103 @@
+////////////////////////////////////////////////////////////////////////////////
+// taskwarrior - a command line task list manager.
+//
+// Copyright 2006-2013, Paul Beckingham, Federico Hernandez.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included
+// in all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+//
+// http://www.opensource.org/licenses/mit-license.php
+//
+////////////////////////////////////////////////////////////////////////////////
+
+#ifndef INCLUDED_PARSER
+#define INCLUDED_PARSER
+
+#include <algorithm>
+#include <map>
+#include <vector>
+#include <string>
+#include <Nibbler.h>
+#include <Tree.h>
+
+class Parser
+{
+public:
+  Parser ();
+  virtual ~Parser ();
+  void grammar (const std::string&);
+  virtual Tree* parse (const std::string&) = 0;
+
+  void verbose ();
+  void dump () const;
+
+protected:
+  class Token
+  {
+  public:
+    Token ();
+    Token (const Token&);
+    Token& operator= (const Token&);
+    void clear ();
+    std::string dump ();
+
+  public:
+    std::string value;
+    char quantifier;
+  };
+
+  class Alternate : public std::vector <Token>
+  {
+  public:
+    Alternate ();
+    Alternate (const Alternate&);
+    Alternate& operator= (const Alternate&);
+    std::string dump ();
+  };
+
+  class Production : public std::vector <Alternate>
+  {
+  public:
+    Production ();
+    Production (const Production&);
+    Production& operator= (const Production&);
+    void tag    (const std::string&);
+    bool hasTag (const std::string&) const;
+    void clear ();
+    std::string dump ();
+
+  private:
+    std::vector <std::string> mTags;
+  };
+
+private:
+  bool bnfNibbleRule (Nibbler&, std::string&, Production&);
+  bool bnfNibbleAlternate (Nibbler&, Alternate&);
+  bool bnfNibbleToken (Nibbler&, Token&);
+
+  void checkConsistency ();
+
+protected:
+  std::string _primary;
+  std::map <std::string, Production> _rules;
+  bool _verbose;
+};
+
+#endif
+
+////////////////////////////////////////////////////////////////////////////////