source/parser.cpp

   1 #include <msp/strings/format.h>
   2 #include "binaryparser.h"
   3 #include "dataerror.h"
   4 #include "parser.h"
   5 #include "statement.h"
   6 #include "textparser.h"
   7
   8 using namespace std;
   9
  10 namespace Msp {
  11 namespace DataFile {
  12
  13 Parser::Parser(IO::Base &i, const string &s):
  14         in(i),
  15         main_src(s),
  16         src(s),
  17         good(true),
  18         mode(new TextParser(in, src))
  19 { }
  20
  21 Parser::~Parser()
  22 {
  23         delete mode;
  24 }
  25
  26 Statement Parser::parse()
  27 {
  28         if(!good)
  29                 throw logic_error("Parser::parse() !good");
  30
  31         try
  32         {
  33                 while(1)
  34                 {
  35                         Statement st = mode->parse();
  36                         if(st.keyword=="__bin")
  37                         {
  38                                 delete mode;
  39                                 mode = new BinaryParser(in, src);
  40                         }
  41                         else if(st.keyword=="__text")
  42                         {
  43                                 delete mode;
  44                                 mode = new TextParser(in, src);
  45                         }
  46                         else if(st.keyword=="__src")
  47                         {
  48                                 string s = st.args[0].get<string>();
  49                                 if(s.empty())
  50                                         src = main_src;
  51                                 else
  52                                         src = format("%s[%s]", main_src, s);
  53                         }
  54                         else
  55                                 return st;
  56                 }
  57         }
  58         catch(const exception &e)
  59         {
  60                 good = false;
  61                 if(dynamic_cast<const data_error *>(&e))
  62                         throw;
  63                 else
  64                         throw data_error(src, in.get_line_number(), e);
  65         }
  66 }
  67
  68 } // namespace DataFile
  69 } // namespace Msp