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/*
See license.txt in the root of this project.
*/
# include "luametatex.h"
# include "lmtoptional.h"
# define GS_ARG_ENCODING_UTF8 1
typedef struct gslib_state_info {
int initialized;
int padding;
luaL_Buffer outbuffer;
luaL_Buffer errbuffer;
int (*gsapi_new_instance) (
void **pinstance,
void *caller_handle
);
void (*gsapi_delete_instance) (
void * instance
);
int (*gsapi_set_arg_encoding) (
void *instance,
int encoding
);
int (*gsapi_init_with_args) (
void *instance,
int argc,
const char **argv
);
int (*gsapi_set_stdio) (
void *instance,
int (*stdin_fn )(void *caller_handle, char *buf, int len),
int (*stdout_fn)(void *caller_handle, const char *str, int len),
int (*stderr_fn)(void *caller_handle, const char *str, int len)
);
/*
int (*gsapi_run_string_begin) (void *instance, int user_errors, int *pexit_code);
int (*gsapi_run_string_continue) (void *instance, const char *str, unsigned int length, int user_errors, int *pexit_code);
int (*gsapi_run_string_end) (void *instance, int user_errors, int *pexit_code);
int (*gsapi_run_string_with_length) (void *instance, const char *str, unsigned int length, int user_errors, int *pexit_code);
int (*gsapi_run_string) (void *instance, const char *str, int user_errors, int *pexit_code);
int (*gsapi_run_file) (void *instance, const char *file_name, int user_errors, int *pexit_code);
int (*gsapi_exit) (void *instance);
*/
} gslib_state_info;
static gslib_state_info gslib_state = {
.initialized = 0,
.padding = 0,
/* .outbuffer = NULL, */
/* .errbuffer = NULL, */
.gsapi_new_instance = NULL,
.gsapi_delete_instance = NULL,
.gsapi_set_arg_encoding = NULL,
.gsapi_init_with_args = NULL,
.gsapi_set_stdio = NULL,
};
static int gslib_initialize(lua_State * L)
{
if (! gslib_state.initialized) {
const char *filename = lua_tostring(L, 1);
if (filename) {
lmt_library lib = lmt_library_load(filename);
gslib_state.gsapi_new_instance = lmt_library_find(lib, "gsapi_new_instance");
gslib_state.gsapi_delete_instance = lmt_library_find(lib, "gsapi_delete_instance");
gslib_state.gsapi_set_arg_encoding = lmt_library_find(lib, "gsapi_set_arg_encoding");
gslib_state.gsapi_init_with_args = lmt_library_find(lib, "gsapi_init_with_args");
gslib_state.gsapi_set_stdio = lmt_library_find(lib, "gsapi_set_stdio");
gslib_state.initialized = lmt_library_okay(lib);
}
}
lua_pushboolean(L, gslib_state.initialized);
return 1;
}
/* We could have a callback for stdout and error. */
static int gslib_stdout(void * caller_handle, const char *str, int len)
{
(void) caller_handle;
luaL_addlstring(&gslib_state.outbuffer, str, len);
return len;
}
static int gslib_stderr(void * caller_handle, const char *str, int len)
{
(void) caller_handle;
luaL_addlstring(&gslib_state.errbuffer, str, len);
return len;
}
static int gslib_execute(lua_State * L)
{
if (gslib_state.initialized) {
if (lua_type(L, 1) == LUA_TTABLE) {
size_t n = (int) lua_rawlen(L, 1);
if (n > 0) {
void *instance = NULL;
int result = gslib_state.gsapi_new_instance(&instance, NULL);
if (result >= 0) {
/*tex
Strings are not yet garbage colected. We add some slack. Here MSVC wants
|char**| and gcc wants |const char**| i.e.\ doesn't like a castso we just
accept the less annoying MSVC warning.
*/
const char** arguments = malloc((n + 2) * sizeof(char*));
if (arguments) {
int m = 1;
/*tex This is a kind of dummy. */
arguments[0] = "ghostscript";
luaL_buffinit(L, &gslib_state.outbuffer);
luaL_buffinit(L, &gslib_state.errbuffer);
gslib_state.gsapi_set_stdio(instance, NULL, &gslib_stdout, &gslib_stderr);
for (size_t i = 1; i <= n; i++) {
lua_rawgeti(L, 1, i);
switch (lua_type(L, -1)) {
case LUA_TSTRING:
case LUA_TNUMBER:
{
size_t l = 0;
const char *s = lua_tolstring(L, -1, &l);
if (l > 0) {
arguments[m] = s;
m += 1;
}
}
break;
}
lua_pop(L, 1);
}
arguments[m] = NULL;
result = gslib_state.gsapi_set_arg_encoding(instance, GS_ARG_ENCODING_UTF8);
result = gslib_state.gsapi_init_with_args(instance, m, arguments);
gslib_state.gsapi_delete_instance(instance);
/* Nothing done with the array cells! No gc done yet anyway. */
free((void *) arguments);
lua_pushboolean(L, result >= 0);
luaL_pushresult(&gslib_state.outbuffer);
luaL_pushresult(&gslib_state.errbuffer);
return 3;
}
}
}
}
}
return 0;
}
static struct luaL_Reg gslib_function_list[] = {
{ "initialize", gslib_initialize },
{ "execute", gslib_execute },
{ NULL, NULL },
};
int luaopen_ghostscript(lua_State * L)
{
lmt_library_register(L, "ghostscript", gslib_function_list);
return 0;
}
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