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#include <expat.h>
#include "tileset.h"
#include "../xml.h"
#include "../logging.h"
/*
* Problem:
* xml_tselem_start(), xml_tileset_end(), etc. may be called with one of two
* types of user data.
* Possible solution:
* 1. Create a base (struct xml_doc) in src/xml.h:
* struct xml_doc {
* enum {
* XML_DOC_TMX,
* XML_DOC_TSX
* } type;
* XML_Parser p;
* };
* 2. Make (struct tmx) and (struct tmx) "extend" it, e.g.:
* struct tsx {
* struct xml_doc doc;
* struct tileset *ts;
* };
* 3. Make xml_tselem_start(), xml_tileset_end(), etc. check the doc.type
* member of the user data and find the (struct tileset *) accordingly.
* Wait, what?!
* Alternative solution:
* 1. Declare (struct tmx) in src/resources/map.h.
* 2. Add to (struct tsx) the following member:
* struct tmx *parent_tmx;
* 3. In xml_mapelem_start() (src/resources/map.c):
* 1. Allocate a (struct tsx).
* 2. Set the parent_tmx member of the (struct tsx) to tmx.
* 3. Set the ts member of the (struct tsx) to ts.
* 4. Set the (struct tsx) as the user data.
* 4. In xml_tileset_end() (src/resources/tileset.c), add the following code:
* if (tsx->parent_tmx != NULL) {
* XML_SetUserData(tsx->p, tsx->parent_tmx);
* free(tsx);
* XML_SetStartElementHandler(tmx->p, xml_mapelem_start);
* XML_SetEndElementHandler(tmx->p, xml_map_end);
* }
* Alternative alternative solution:
* Something that doesn't suck.
*/
struct tsx {
XML_Parser p;
struct tileset *ts;
};
struct resource_table ts_res;
void XMLCALL
xml_tileset_start(void *data, const char *el, const char **attr)
{
struct tsx *tsx;
debug("<%s> (type \"tileset\")", el);
tsx = (struct tsx *) data;
if (xml_check_tag(el, "tileset")) {
xml_get_string_attr(tsx->p, attr, "name",
&tsx->ts->name, 1);
xml_get_int_attr(tsx->p, attr, "tilewidth",
&tsx->ts->tilewidth, 1);
xml_get_int_attr(tsx->p, attr, "tileheight",
&tsx->ts->tileheight, 1);
/* XML_SetStartElementHandler(tsx->p, xml_tselem_start);*/
XML_SetEndElementHandler(tsx->p, xml_tileset_end);
} else {
xml_unexpected_start_tag(tsx->p, el,
"tileset");
}
}
void XMLCALL
xml_tileset_end(void *data, const char *el)
{
struct tsx *tsx;
debug("</%s> (type \"tileset\")", el);
tsx = (struct tsx *) data;
if (xml_check_tag(el, "tileset")) {
XML_SetStartElementHandler(tsx->p, NULL);
XML_SetEndElementHandler(tsx->p, NULL);
} else {
xml_unexpected_end_tag(tsx->p, el,
"tileset");
}
}
struct tileset *
tileset_get(const char *path)
{
struct tsx tsx;
FILE *tsx_fp;
void *tsx_buf;
size_t len;
enum XML_Status status;
memset(&tsx, 0, sizeof(tsx));
tsx.ts = (struct tileset *) resource_get(&ts_res, path);
if (tsx.ts != NULL) {
resource_use((struct resource *) tsx.ts);
return tsx.ts;
}
tsx.ts = resource_alloc(path, sizeof(*tsx.ts));
tsx.p = XML_ParserCreate(NULL);
if (tsx.p == NULL) {
warn("Failed to create TSX parser");
return NULL;
}
XML_SetStartElementHandler(tsx.p, xml_tileset_start);
XML_SetEndElementHandler(tsx.p, NULL);
XML_SetCharacterDataHandler(tsx.p, NULL);
XML_SetUserData(tsx.p, &tsx);
tsx_fp = fopen(path, "rb");
if (tsx_fp == NULL) {
warn("Failed to open TSX file");
XML_ParserFree(tsx.p);
return NULL;
}
tsx_buf = XML_GetBuffer(tsx.p, 8192);
if (tsx_buf == NULL) {
warn("Failed to create TSX parse buffer");
XML_ParserFree(tsx.p);
fclose(tsx_fp);
return NULL;
}
while (!feof(tsx_fp)) {
len = fread(tsx_buf, 1, 8192, tsx_fp);
status = XML_ParseBuffer(tsx.p, len, feof(tsx_fp));
if (status == XML_STATUS_OK) {
continue;
}
warn("Failed to parse TSX file (%s)",
XML_ErrorString(XML_GetErrorCode(tsx.p)));
XML_ParserFree(tsx.p);
fclose(tsx_fp);
return NULL;
}
XML_ParserFree(tsx.p);
fclose(tsx_fp);
resource_use((struct resource *) tsx.ts);
resource_add(&ts_res, path, (struct resource *) tsx.ts);
return tsx.ts;
}
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