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/bnf.cpp

@@ -0,0 +1,126 @@
+////////////////////////////////////////////////////////////////////////////////
+// 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
+//
+////////////////////////////////////////////////////////////////////////////////
+
+#include <iostream>
+#include <fstream>
+#include <unistd.h>
+#include <stdlib.h>
+#include <string.h>
+#include <Context.h>
+#include <File.h>
+#include <Tree.h>
+#include <LRParser.h>
+#include <text.h>
+
+Context context;
+
+////////////////////////////////////////////////////////////////////////////////
+void usage ()
+{
+  std::cout << std::endl
+            << "Usage: parser [options] <grammar file> <args>"
+            << std::endl
+            << std::endl
+            << "Options are:"
+            << std::endl
+            << "  -v/--verbose       Increased verbosity"
+            << std::endl
+            << std::endl;
+
+  exit (-1);
+}
+
+////////////////////////////////////////////////////////////////////////////////
+int main (int argc, char** argv)
+{
+  // Process command line arguments
+  std::string grammarFile = "";
+  std::string commandLine = "";
+  std::vector <std::string> args;
+  bool verbose = false;
+
+  for (int i = 1; i < argc; ++i)
+  {
+    if (argv[i][0] == '-')
+    {
+           if (!strcmp (argv[i], "-h"))         usage ();
+      else if (!strcmp (argv[i], "--help"))     usage ();
+      else if (!strcmp (argv[i], "-v"))         verbose = true;
+      else if (!strcmp (argv[i], "--verbose"))  verbose = true;
+      else
+      {
+        std::cout << "Unrecognized option '" << argv[i] << "'" << std::endl;
+        usage ();
+      }
+    }
+    else if (grammarFile == "")
+    {
+      grammarFile = argv[i];
+    }
+    else
+    {
+      if (commandLine != "")
+        commandLine += " ";
+
+      commandLine += "'" + std::string (argv[i]) + "'";
+    }
+  }
+
+  // Display usage for incorrect command line.
+  if (grammarFile == "" || commandLine == "")
+    usage ();
+
+  try
+  {
+    std::string grammar;
+    if (File::read (grammarFile, grammar))
+    {
+      // Parse the tokens.
+      LRParser p;
+      if (verbose) p.verbose ();
+
+      p.grammar (grammar);
+
+      if (verbose) p.dump ();
+      Tree* t = p.parse (commandLine);
+      if (t)
+      {
+        t->dump ();
+        delete t;
+      }
+    }
+  }
+
+  catch (const std::string& error)
+  {
+    std::cout << "Error: " << error << std::endl;
+  }
+
+  return 0;
+}
+
+////////////////////////////////////////////////////////////////////////////////