Move all exception classes to except.h, for real this time

[libs/datafile.git] / source / loader.cpp

diff --git a/source/loader.cpp b/source/loader.cpp
index c495c4cab71ed67b11d678e0cacaf02eec0bb312..81fd27eecebf87c16e3418ae6d11e3ead9ba8d80 100644 (file)
--- a/source/loader.cpp
+++ b/source/loader.cpp
@@ -1,5 +1,6 @@
+#include <msp/core/raii.h>
 #include <msp/strings/format.h>
-#include "dataerror.h"
+#include "except.h"
 #include "loader.h"
 #include "type.h"
 
@@ -7,16 +8,6 @@ using namespace std;
 
 namespace {
 
-template<typename T>
-struct Set
-{
-       T &ref;
-       T orig;
-
-       Set(T &r, const T &v): ref(r), orig(r) { r = v; }
-       ~Set() { ref = orig; }
-};
-
 bool signature_match(char s, char a)
 {
        if(s==a)
@@ -33,7 +24,7 @@ bool signature_match(const string &st_sig, const string &act_sig)
        else if(act_sig.size()==2 && act_sig[1]=='*')
        {
                for(string::const_iterator i=st_sig.begin(); i!=st_sig.end(); ++i)
-                       if(*i!=act_sig[0])
+                       if(!signature_match(*i, act_sig[0]))
                                return false;
 
                return true;
@@ -56,30 +47,9 @@ bool signature_match(const string &st_sig, const string &act_sig)
 namespace Msp {
 namespace DataFile {
 
-class unknown_keyword: public runtime_error
-{
-public:
-       unknown_keyword(const std::string &k):
-               runtime_error(k)
-       { }
-
-       virtual ~unknown_keyword() throw() { }
-};
-
-
-class invalid_signature: public runtime_error
-{
-public:
-       invalid_signature(const std::string &k, const std::string &s):
-               runtime_error(format("%s %s", k, s))
-       { }
-
-       virtual ~invalid_signature() throw() { }
-};
-
-
 Loader::Loader():
        cur_st(0),
+       direct(false),
        check_sub_loads(false)
 { }
 
@@ -93,9 +63,15 @@ void Loader::load(Parser &p)
 {
        while(p)
        {
-               Statement st = p.parse();
-               if(st.valid)
-                       load_statement(st);
+               if(p.peek(0))
+                       load_direct(p, 0);
+               else if(p)  // Peek may have processed an __end, so recheck goodness
+               {
+                       // Parse in raw mode so we can peek immediately after a mode change
+                       Statement st = p.parse(true);
+                       if(st.valid && !st.control)
+                               load_statement(st);
+               }
        }
        finish();
 }
@@ -107,13 +83,45 @@ void Loader::load(const Statement &st)
        finish();
 }
 
+void Loader::load_direct(Parser &p, unsigned l)
+{
+       SetForScope<Parser *> set_parser(cur_parser, &p);
+       SetForScope<unsigned> set_level(cur_level, l);
+
+       while(p)
+       {
+               const StatementKey *key = p.peek(l);
+               if(!key)
+                       break;
+
+               LoaderAction *act = find_action(*key);
+               if(act)
+               {
+                       SetFlag set_direct(direct);
+                       if(!p.parse_and_load(l, *this, *act))
+                               throw logic_error("direct load failed");
+               }
+               else
+                       load_statement(p.parse());
+       }
+}
+
 void Loader::load_statement(const Statement &st)
 {
-       Set<const Statement *> set_cst(cur_st, &st);
+       SetForScope<const Statement *> set_cst(cur_st, &st);
 
        try
        {
-               LoaderAction *act = find_action(ActionKey(st.keyword, st.get_signature()));
+               StatementKey key(st.keyword, st.get_signature());
+
+               if(!aux_loaders.empty() && !has_action(key))
+               {
+                       for(list<Loader *>::const_iterator i=aux_loaders.begin(); i!=aux_loaders.end(); ++i)
+                               if((*i)->has_action(key))
+                                       return (*i)->load_statement(st);
+               }
+
+               LoaderAction *act = find_action(key);
                if(act)
                {
                        sub_loaded = false;
@@ -134,16 +142,23 @@ void Loader::load_statement(const Statement &st)
 
 void Loader::load_sub_with(Loader &ldr)
 {
-       if(!cur_st)
+       if(direct)
+       {
+               ldr.load_direct(*cur_parser, cur_level+1);
+               ldr.finish();
+       }
+       else if(cur_st)
+       {
+               ldr.load(*cur_st);
+               sub_loaded = true;
+       }
+       else
                throw logic_error("no current statement");
-
-       ldr.load(*cur_st);
-       sub_loaded = true;
 }
 
 void Loader::add(const string &kwd, LoaderAction *act)
 {
-       ActionKey key(kwd, (act ? act->get_signature() : "*"));
+       StatementKey key(kwd, (act ? act->get_signature() : "*"));
        ActionMap::iterator i = actions.find(key);
        if(i!=actions.end())
        {
@@ -154,10 +169,24 @@ void Loader::add(const string &kwd, LoaderAction *act)
                actions[key] = act;
 }
 
-LoaderAction *Loader::find_action(const ActionKey &key) const
+void Loader::add_auxiliary_loader(Loader &ldr)
+{
+       aux_loaders.push_back(&ldr);
+}
+
+bool Loader::has_action(const StatementKey &key) const
+{
+       ActionMap::const_iterator i = actions.lower_bound(StatementKey(key.keyword, string()));
+       for(; (i!=actions.end() && i->first.keyword==key.keyword); ++i)
+               if(signature_match(key.signature, i->first.signature))
+                       return true;
+       return false;
+}
+
+LoaderAction *Loader::find_action(const StatementKey &key) const
 {
-       ActionMap::const_iterator begin = actions.lower_bound(ActionKey(key.keyword, string()));
-       ActionMap::const_iterator end = actions.upper_bound(ActionKey(key.keyword, "~"));
+       ActionMap::const_iterator begin = actions.lower_bound(StatementKey(key.keyword, string()));
+       ActionMap::const_iterator end = actions.upper_bound(StatementKey(key.keyword, "~"));
 
        if(begin==end)
                throw unknown_keyword(key.keyword);
@@ -176,18 +205,5 @@ const string &Loader::get_source() const
        return cur_st->source;
 }
 
-
-Loader::ActionKey::ActionKey(const string &k, const string &s):
-       keyword(k),
-       signature(s)
-{ }
-
-bool Loader::ActionKey::operator<(const ActionKey &other) const
-{
-       if(keyword!=other.keyword)
-               return keyword<other.keyword;
-       return signature<other.signature;
-}
-
 } // namespace DataFile
 } // namespace Msp