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=="__z")
  47                                 in.set_decompress();
  48                         else if(st.keyword=="__src")
  49                         {
  50                                 string s = st.args[0].get<string>();
  51                                 if(s.empty())
  52                                         src = main_src;
  53                                 else
  54                                         src = format("%s[%s]", main_src, s);
  55                         }
  56                         else
  57                                 return st;
  58                 }
  59         }
  60         catch(const exception &e)
  61         {
  62                 good = false;
  63                 if(dynamic_cast<const data_error *>(&e))
  64                         throw;
  65                 else
  66                         throw data_error(src, in.get_line_number(), e);
  67         }
  68 }
  69
  70 } // namespace DataFile
  71 } // namespace Msp