source/parser.cpp

   1 #include <msp/strings/format.h>
   2 #include "binaryparser.h"
   3 #include "parser.h"
   4 #include "statement.h"
   5 #include "textparser.h"
   6
   7 using namespace std;
   8
   9 namespace Msp {
  10 namespace DataFile {
  11
  12 Parser::Parser(IO::Base &i, const string &s):
  13         in(i),
  14         main_src(s),
  15         src(s),
  16         good(true),
  17         mode(new TextParser(in, src))
  18 { }
  19
  20 Parser::~Parser()
  21 {
  22         delete mode;
  23 }
  24
  25 Statement Parser::parse()
  26 {
  27         if(!good)
  28                 throw Exception("Parser is not good");
  29
  30         try
  31         {
  32                 while(1)
  33                 {
  34                         Statement st = mode->parse();
  35                         if(st.keyword=="__bin")
  36                         {
  37                                 delete mode;
  38                                 mode = new BinaryParser(in, src);
  39                         }
  40                         else if(st.keyword=="__text")
  41                         {
  42                                 delete mode;
  43                                 mode = new TextParser(in, src);
  44                         }
  45                         else if(st.keyword=="__src")
  46                         {
  47                                 string s = st.args[0].get<string>();
  48                                 if(s.empty())
  49                                         src = main_src;
  50                                 else
  51                                         src = format("%s[%s]", main_src, s);
  52                         }
  53                         else
  54                                 return st;
  55                 }
  56         }
  57         catch(const Exception &e)
  58         {
  59                 good = false;
  60                 throw;
  61         }
  62 }
  63
  64 } // namespace DataFile
  65 } // namespace Msp