source/loader.cpp

   1 #include <msp/core/raii.h>
   2 #include <msp/strings/format.h>
   3 #include "dataerror.h"
   4 #include "loader.h"
   5 #include "type.h"
   6
   7 using namespace std;
   8
   9 namespace {
  10
  11 bool signature_match(char s, char a)
  12 {
  13         if(s==a)
  14                 return true;
  15         if(s==Msp::DataFile::IntType::signature && a==Msp::DataFile::FloatType::signature)
  16                 return true;
  17         return false;
  18 }
  19
  20 bool signature_match(const string &st_sig, const string &act_sig)
  21 {
  22         if(act_sig=="*")
  23                 return true;
  24         else if(act_sig.size()==2 && act_sig[1]=='*')
  25         {
  26                 for(string::const_iterator i=st_sig.begin(); i!=st_sig.end(); ++i)
  27                         if(*i!=act_sig[0])
  28                                 return false;
  29
  30                 return true;
  31         }
  32         else if(st_sig.size()==act_sig.size())
  33         {
  34                 for(unsigned i=0; i<st_sig.size(); ++i)
  35                         if(!signature_match(st_sig[i], act_sig[i]))
  36                                 return false;
  37
  38                 return true;
  39         }
  40         else
  41                 return false;
  42 }
  43
  44 }
  45
  46
  47 namespace Msp {
  48 namespace DataFile {
  49
  50 class unknown_keyword: public runtime_error
  51 {
  52 public:
  53         unknown_keyword(const std::string &k):
  54                 runtime_error(k)
  55         { }
  56
  57         virtual ~unknown_keyword() throw() { }
  58 };
  59
  60
  61 class invalid_signature: public runtime_error
  62 {
  63 public:
  64         invalid_signature(const std::string &k, const std::string &s):
  65                 runtime_error(format("%s %s", k, s))
  66         { }
  67
  68         virtual ~invalid_signature() throw() { }
  69 };
  70
  71
  72 Loader::Loader():
  73         cur_st(0),
  74         check_sub_loads(false)
  75 { }
  76
  77 Loader::~Loader()
  78 {
  79         for(ActionMap::iterator i=actions.begin(); i!=actions.end(); ++i)
  80                 delete i->second;
  81 }
  82
  83 void Loader::load(Parser &p)
  84 {
  85         while(p)
  86         {
  87                 Statement st = p.parse();
  88                 if(st.valid)
  89                         load_statement(st);
  90         }
  91         finish();
  92 }
  93
  94 void Loader::load(const Statement &st)
  95 {
  96         for(list<Statement>::const_iterator i=st.sub.begin(); i!=st.sub.end(); ++i)
  97                 load_statement(*i);
  98         finish();
  99 }
 100
 101 void Loader::load_statement(const Statement &st)
 102 {
 103         SetForScope<const Statement *> set_cst(cur_st, &st);
 104
 105         try
 106         {
 107                 StatementKey key(st.keyword, st.get_signature());
 108
 109                 if(!aux_loaders.empty() && !has_action(key))
 110                 {
 111                         for(list<Loader *>::const_iterator i=aux_loaders.begin(); i!=aux_loaders.end(); ++i)
 112                                 if((*i)->has_action(key))
 113                                         return (*i)->load_statement(st);
 114                 }
 115
 116                 LoaderAction *act = find_action(key);
 117                 if(act)
 118                 {
 119                         sub_loaded = false;
 120                         act->execute(*this, st);
 121                         if(check_sub_loads && !st.sub.empty() && !sub_loaded)
 122                                 throw logic_error("substatements ignored");
 123                 }
 124         }
 125         catch(const data_error &)
 126         {
 127                 throw;
 128         }
 129         catch(const exception &e)
 130         {
 131                 throw data_error(st.source, st.line, e);
 132         }
 133 }
 134
 135 void Loader::load_sub_with(Loader &ldr)
 136 {
 137         if(!cur_st)
 138                 throw logic_error("no current statement");
 139
 140         ldr.load(*cur_st);
 141         sub_loaded = true;
 142 }
 143
 144 void Loader::add(const string &kwd, LoaderAction *act)
 145 {
 146         StatementKey key(kwd, (act ? act->get_signature() : "*"));
 147         ActionMap::iterator i = actions.find(key);
 148         if(i!=actions.end())
 149         {
 150                 delete i->second;
 151                 i->second = act;
 152         }
 153         else
 154                 actions[key] = act;
 155 }
 156
 157 void Loader::add_auxiliary_loader(Loader &ldr)
 158 {
 159         aux_loaders.push_back(&ldr);
 160 }
 161
 162 bool Loader::has_action(const StatementKey &key) const
 163 {
 164         ActionMap::const_iterator i = actions.lower_bound(StatementKey(key.keyword, string()));
 165         for(; (i!=actions.end() && i->first.keyword==key.keyword); ++i)
 166                 if(signature_match(key.signature, i->first.signature))
 167                         return true;
 168         return false;
 169 }
 170
 171 LoaderAction *Loader::find_action(const StatementKey &key) const
 172 {
 173         ActionMap::const_iterator begin = actions.lower_bound(StatementKey(key.keyword, string()));
 174         ActionMap::const_iterator end = actions.upper_bound(StatementKey(key.keyword, "~"));
 175
 176         if(begin==end)
 177                 throw unknown_keyword(key.keyword);
 178
 179         for(ActionMap::const_iterator i=begin; i!=end; ++i)
 180                 if(signature_match(key.signature, i->first.signature))
 181                         return i->second;
 182
 183         throw invalid_signature(key.keyword, key.signature);
 184 }
 185
 186 const string &Loader::get_source() const
 187 {
 188         if(!cur_st)
 189                 throw logic_error("no current statement");
 190         return cur_st->source;
 191 }
 192
 193 } // namespace DataFile
 194 } // namespace Msp