function readParameter parses ascii file for keywords and reads paramters.

[[Imported from SVN: r1256]]

io/file/asciiparser.hh

+// -*- tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+// vi: set et ts=4 sw=2 sts=2:
+#ifndef __DUNE_ASCIIPARSER_HH__
+#define __DUNE_ASCIIPARSER_HH__
+
+namespace Dune {
+
+  static const int MAXTAB = 30;
+
+  //! reads data folowing the given keyword
+  //! if verbose is true then an output of what was read is given
+  //! the token '%' stands for comment
+  template <class T>
+  bool readParameter (const char * filename,
+                      const char keywd[], T & data, bool verbose = true)
+  {
+    std::fstream file (filename,std::ios::in);
+    std::basic_string<char> keyword ( keywd );
+    bool readData = false;
+    char ch[1024];
+    while (! file.eof() )
+    {
+      std::basic_string <char> keyHelp;
+      file >> keyHelp;
+
+      if(keyHelp[0] == '%')
+      {
+        file.getline(ch,1024,'\n');
+      }
+      else
+      {
+        // copy only keyword size and compare
+        int pos = keyHelp.find_first_of(':');
+        int pos1 = keyHelp.find_first_of(' ');
+
+        if (pos > 0)
+        {
+          if(pos1 > 0)
+            pos -=  pos1;
+          else
+            pos = 1;
+        }
+        else
+          pos = 0;
+
+        std::basic_string <char> key  (keyHelp,0,keyHelp.size() - pos);
+        if(key == keyword)
+        {
+          file >> data;
+          readData = true;
+          break;
+        }
+      }
+    }
+    file.close();
+    if(readData)
+    {
+      if(verbose)
+      {
+        int length = MAXTAB - keyword.size();
+        std::cout << "Reading " << keyword;
+        for(int i=0; i<length; i++) std::cout << ".";
+        std::cout << " " << data << "\n";;
+      }
+    }
+    else
+    {
+      std::cerr << "WARNING: couldn't read " << keyword << "\n";
+    }
+
+    return readData;
+  }
+
+} // end namespace
+
+#endif