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 <msp/strings/formatter.h>
   8 #include "binaryparser.h"
   9 #include "parser.h"
  10 #include "statement.h"
  11 #include "textparser.h"
  12
  13 using namespace std;
  14
  15 namespace Msp {
  16 namespace DataFile {
  17
  18 Parser::Parser(IO::Base &i, const string &s):
  19         in(i),
  20         main_src(s),
  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 if(st.keyword=="__src")
  52                         {
  53                                 string s = st.args[0].get<string>();
  54                                 if(s.empty())
  55                                         src = main_src;
  56                                 else
  57                                         src = format("%s[%s]", main_src, s);
  58                         }
  59                         else
  60                                 return st;
  61                 }
  62         }
  63         catch(const Exception &e)
  64         {
  65                 good = false;
  66                 throw;
  67         }
  68 }
  69
  70 } // namespace DataFile
  71 } // namespace Msp