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[era] parser for the XML format

This commit is contained in:
Joe Thornber 2014-08-06 16:30:38 +01:00
parent 3e5c02459c
commit 8f73241119
2 changed files with 84 additions and 2 deletions
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4
Makefile.in
View File

@ -411,7 +411,7 @@ ERA_DUMP_OBJECTS=$(subst .cc,.o,$(ERA_DUMP_SOURCE))
era_dump: $(ERA_DUMP_OBJECTS) era/era_dump.o
@echo " [LD] $@"
$(V) $(CXX) $(CXXFLAGS) $(LDFLAGS) -o $@ $+ $(LIBS)
$(V) $(CXX) $(CXXFLAGS) $(LDFLAGS) -o $@ $+ $(LIBS) $(LIBEXPAT)
ERA_INVALIDATE_SOURCE=\
block-cache/block_cache.cc \
@ -445,7 +445,7 @@ ERA_INVALIDATE_OBJECTS=$(subst .cc,.o,$(ERA_INVALIDATE_SOURCE))
era_invalidate: $(ERA_INVALIDATE_OBJECTS) era/era_invalidate.o
@echo " [LD] $@"
$(V) $(CXX) $(CXXFLAGS) $(LDFLAGS) -o $@ $+ $(LIBS)
$(V) $(CXX) $(CXXFLAGS) $(LDFLAGS) -o $@ $+ $(LIBS) $(LIBEXPAT)
#----------------------------------------------------------------

82
era/xml_format.cc
View File

@ -1,11 +1,15 @@
#include "era/xml_format.h"
#include "base/indented_stream.h"
#include "base/xml_utils.h"
#include <expat.h>
using namespace boost;
using namespace era;
using namespace persistent_data;
using namespace std;
using namespace xml_utils;
//----------------------------------------------------------------
@ -75,6 +79,56 @@ namespace {
private:
indented_stream out_;
};
//--------------------------------
// Parser
//--------------------------------
void start_tag(void *data, char const *el, char const **attr) {
emitter *e = static_cast<emitter *>(data);
attributes a;
build_attributes(a, attr);
if (!strcmp(el, "superblock"))
e->begin_superblock(get_attr<string>(a, "uuid"),
get_attr<uint32_t>(a, "block_size"),
get_attr<pd::block_address>(a, "nr_blocks"),
get_attr<uint32_t>(a, "current_era"));
else if (!strcmp(el, "writeset"))
e->begin_writeset(get_attr<uint32_t>(a, "era"),
get_attr<uint32_t>(a, "nr_bits"));
else if (!strcmp(el, "bit"))
e->writeset_bit(get_attr<uint32_t>(a, "bit"),
get_attr<bool>(a, "value"));
else if (!strcmp(el, "era_array"))
e->begin_era_array();
else if (!strcmp(el, "era"))
e->era(get_attr<pd::block_address>(a, "block"),
get_attr<uint32_t>(a, "era"));
else
throw runtime_error("unknown tag type");
}
void end_tag(void *data, const char *el) {
emitter *e = static_cast<emitter *>(data);
if (!strcmp(el, "superblock"))
e->end_superblock();
else if (!strcmp(el, "writeset"))
e->end_writeset();
else if (!strcmp(el, "era_array"))
e->end_era_array();
else
throw runtime_error("unknown tag type");
}
}
//----------------------------------------------------------------
@ -85,4 +139,32 @@ era::create_xml_emitter(std::ostream &out)
return emitter::ptr(new xml_emitter(out));
}
void
era::parse_xml(std::istream &in, emitter::ptr e)
{
XML_Parser parser = XML_ParserCreate(NULL);
if (!parser)
throw runtime_error("couldn't create xml parser");
XML_SetUserData(parser, e.get());
XML_SetElementHandler(parser, start_tag, end_tag);
while (!in.eof()) {
char buffer[4096];
in.read(buffer, sizeof(buffer));
size_t len = in.gcount();
int done = in.eof();
if (!XML_Parse(parser, buffer, len, done)) {
ostringstream out;
out << "Parse error at line "
<< XML_GetCurrentLineNumber(parser)
<< ":\n"
<< XML_ErrorString(XML_GetErrorCode(parser))
<< endl;
throw runtime_error(out.str());
}
}
}
//----------------------------------------------------------------