source/parser.cpp

   1 /* $Id$
   2
   3 This file is part of libmspdatafile
   4 Copyright © 2006  Mikko Rasa, Mikkosoft Productions
   5 Distributed under the LGPL
   6 */
   7 #include <cctype>
   8 #include <sstream>
   9 #include "binaryparser.h"
  10 #include "parser.h"
  11 #include "statement.h"
  12 #include "textparser.h"
  13
  14 using namespace std;
  15
  16 namespace Msp {
  17 namespace DataFile {
  18
  19 Parser::Parser(istream &i, const string &s):
  20         in(i),
  21         src(s),
  22         good(true),
  23         mode(new TextParser(in, src))
  24 { }
  25
  26 Parser::~Parser()
  27 {
  28         delete mode;
  29 }
  30
  31 Statement Parser::parse()
  32 {
  33         if(!good)
  34                 throw Exception("Parser is not good");
  35
  36         try
  37         {
  38                 while(1)
  39                 {
  40                         Statement st=mode->parse();
  41                         if(st.keyword=="__bin")
  42                         {
  43                                 delete mode;
  44                                 mode=new BinaryParser(in, src);
  45                         }
  46                         else if(st.keyword=="__text")
  47                         {
  48                                 delete mode;
  49                                 mode=new TextParser(in, src);
  50                         }
  51                         else
  52                                 return st;
  53                 }
  54         }
  55         catch(const Exception &e)
  56         {
  57                 good=false;
  58                 throw;
  59         }
  60 }
  61
  62 } // namespace DataFile
  63 } // namespace Msp