ENH: add C++-based wmkdepend parser (uses Coco/R grammar).

- This avoids dependency on lex/flex and provides better encapsulation
  for buffer switching. As a result, the maximum number of open files
  only corresponds to the include depth.

wmake/src/wmkdepend.cpp

@@ -0,0 +1,164 @@
+/*---------------------------------------------------------------------------*\
+ =========                   |
+ \\      /   F ield          | OpenFOAM: The Open Source CFD Toolbox
+  \\    /    O peration      |
+   \\  /     A nd            | Copyright (C) 2010-2010 OpenCFD Ltd.
+    \\/      M anipulation   |
+------------------------------------------------------------------------------
+License
+    This file is part of OpenFOAM.
+
+    OpenFOAM is free software; you can redistribute it and/or modify it
+    under the terms of the GNU General Public License as published by the
+    Free Software Foundation; either version 2 of the License, or (at your
+    option) any later version.
+
+    OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
+    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+    for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with OpenFOAM; if not, write to the Free Software Foundation,
+    Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+
+Application
+    wmkdepend
+
+Description
+    A fast dependency list generator that emulates the behaviour and
+    output of cpp -M. However, the output contains no duplications and
+    is ~40% faster than cpp.
+
+    The algorithm uses flex to scan for includes and searches the files
+    found.  Each file is entered into a hash table so that files are scanned
+    only once.  This is why this program is faster than cpp.
+
+Usage
+    wmkdep [ -Idirectory ... -Idirectory ] filename
+
+\*---------------------------------------------------------------------------*/
+
+#include <cstdio>
+#include <stdlib.h>
+#include <cstring>
+
+#include "wmkdependParser.h"
+
+// Note: since we use the Coco/R default error messages, we must use
+// wide streams for stderr.
+
+void printUsage(const char* message = NULL)
+{
+    if (message)
+    {
+        fwprintf(stderr, L"\nError: %s\n\n", message);
+    }
+
+    fwprintf
+    (
+        stderr,
+        L"Usage: wmkdepend [ -Idirectory ... -Idirectory ] filename\n"
+    );
+}
+
+
+int main(int argc, char* argv[])
+{
+    if (argc == 1)
+    {
+        printUsage("Error: input file not supplied");
+        ::exit(1);
+    }
+
+    for (int i=1; i < argc; i++)
+    {
+        if (strncmp(argv[i], "-I", 2) == 0 && strlen(argv[i]) > 2)
+        {
+            std::string dirName(argv[i] + 2);
+
+            // add trailing slash if required
+            if (dirName.rfind('/') != dirName.size()-1)
+            {
+                dirName += '/';
+            }
+
+            wmake::Parser::includeDirs.push_back(dirName);
+        }
+    }
+
+    std::string sourceFile(argv[argc-1]);
+
+    fwprintf
+    (
+        stderr,
+        L"Making dependency list for source file %s\n",
+        sourceFile.c_str()
+    );
+
+    std::string::size_type basePos = sourceFile.rfind('/');
+    if (basePos == std::string::npos)
+    {
+        basePos = 0;
+    }
+    else
+    {
+        basePos++;
+    }
+
+    std::string::size_type dotPos = sourceFile.rfind('.');
+    if
+    (
+        dotPos == std::string::npos
+     || dotPos == sourceFile.size()-1
+     || dotPos <= basePos
+    )
+    {
+        fwprintf
+        (
+            stderr,
+            L"Cannot find extension in source file name %s\n",
+            sourceFile.c_str()
+        );
+        ::exit(1);
+    }
+
+    std::string depFile = sourceFile.substr(0, dotPos);
+    depFile += ".dep";
+
+    const std::string sourceExt = sourceFile.substr(dotPos);
+    if (sourceExt == ".java")
+    {
+        // import directories to ignore
+        wmake::Parser::ignoreDir("java.*");
+        wmake::Parser::ignoreDir("org.*");
+        wmake::Parser::ignoreDir("com.*");
+        wmake::Parser::ignoreDir("sunw.*");
+        wmake::Parser::ignoreDir("sun.*");
+        wmake::Parser::ignoreDir("launcher.*");
+
+        std::cout
+            << "$(CLASSES_DIR)/"
+            << sourceFile.substr(basePos, dotPos - basePos) << ".class: "
+            << depFile << "\n";
+    }
+    else
+    {
+        std::cout
+            << "$(OBJECTS_DIR)/"
+            << sourceFile.substr(basePos, dotPos - basePos) << ".o: "
+            << depFile << "\n";
+    }
+
+
+    wmake::Parser::sourceFile = sourceFile;
+    wmake::Parser::depFile = depFile;
+
+    wmake::Parser::includeFile(sourceFile);
+
+    return 0;
+}
+
+
+
+/*****************************************************************************/