X-Git-Url: http://git.tdb.fi/?p=libs%2Fdatafile.git;a=blobdiff_plain;f=source%2Floader.cpp;h=bffa9fd31c6ccf5018535139aa119f859d3c36b0;hp=62c4b312d7f61efa1a56ae9d3e74d6dca6d515a0;hb=d248c63a252b0efcbcd9ef11cf7f8e22e594403e;hpb=3b0d6fb8462bf87956099365d02ebb28435509cd

diff --git a/source/loader.cpp b/source/loader.cpp
index 62c4b31..bffa9fd 100644
--- a/source/loader.cpp
+++ b/source/loader.cpp
@@ -1,4 +1,5 @@
 #include <msp/strings/format.h>
+#include "dataerror.h"
 #include "loader.h"
 #include "type.h"
 
@@ -6,6 +7,16 @@ 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)
@@ -41,18 +52,40 @@ 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),
-	allow_pointer_reload(true),
 	check_sub_loads(false)
 { }
 
 Loader::~Loader()
 {
-	for(ActionMap::iterator i = actions.begin(); i!=actions.end(); ++i)
+	for(ActionMap::iterator i=actions.begin(); i!=actions.end(); ++i)
 		delete i->second;
 }
 
@@ -69,42 +102,49 @@ void Loader::load(Parser &p)
 
 void Loader::load(const Statement &st)
 {
-	for(list<Statement>::const_iterator i = st.sub.begin(); i!=st.sub.end(); ++i)
+	for(list<Statement>::const_iterator i=st.sub.begin(); i!=st.sub.end(); ++i)
 		load_statement(*i);
 	finish();
 }
 
 void Loader::load_statement(const Statement &st)
 {
-	cur_st = &st;
+	Set<const Statement *> set_cst(cur_st, &st);
 
 	try
 	{
-		LoaderAction *act = find_action(ActionKey(st.keyword, st.get_signature()));
+		ActionKey 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;
 			act->execute(*this, st);
 			if(check_sub_loads && !st.sub.empty() && !sub_loaded)
-				throw Exception("Substatements were not loaded");
+				throw logic_error("substatements ignored");
 		}
 	}
-	catch(Exception &e)
+	catch(const data_error &)
 	{
-		cur_st = 0;
-		if(!e.where()[0])
-			e.at(st.get_location());
-
 		throw;
 	}
-
-	cur_st = 0;
+	catch(const exception &e)
+	{
+		throw data_error(st.source, st.line, e);
+	}
 }
 
 void Loader::load_sub_with(Loader &ldr)
 {
 	if(!cur_st)
-		throw InvalidState("load_sub called without current statement");
+		throw logic_error("no current statement");
 
 	ldr.load(*cur_st);
 	sub_loaded = true;
@@ -123,19 +163,40 @@ void Loader::add(const string &kwd, LoaderAction *act)
 		actions[key] = act;
 }
 
+void Loader::add_auxiliary_loader(Loader &ldr)
+{
+	aux_loaders.push_back(&ldr);
+}
+
+bool Loader::has_action(const ActionKey &key) const
+{
+	ActionMap::const_iterator i = actions.lower_bound(ActionKey(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 ActionKey &key) const
 {
 	ActionMap::const_iterator begin = actions.lower_bound(ActionKey(key.keyword, string()));
 	ActionMap::const_iterator end = actions.upper_bound(ActionKey(key.keyword, "~"));
 
 	if(begin==end)
-		throw KeyError("Unknown keyword", key.keyword);
+		throw unknown_keyword(key.keyword);
 
 	for(ActionMap::const_iterator i=begin; i!=end; ++i)
 		if(signature_match(key.signature, i->first.signature))
 			return i->second;
 
-	throw KeyError(format("Keyword '%s' does not accept signature '%s'", key.keyword, key.signature));
+	throw invalid_signature(key.keyword, key.signature);
+}
+
+const string &Loader::get_source() const
+{
+	if(!cur_st)
+		throw logic_error("no current statement");
+	return cur_st->source;
 }