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/*
* stylesheet.c
*
* Copyright © 2013-2018 Thomas White <taw@bitwiz.org.uk>
*
* This file is part of Colloquium.
*
* Colloquium is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <json-glib/json-glib.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <gio/gio.h>
#include <gdk/gdk.h>
#include "stylesheet.h"
#include "utils.h"
struct _stylesheet {
JsonNode *root;
};
static int find_comma(const char *a)
{
int i = 0;
int in_brackets = 0;
size_t len = strlen(a);
do {
if ( (a[i] == ',') && !in_brackets ) return i;
if ( a[i] == '(' ) in_brackets++;
if ( a[i] == ')' ) in_brackets--;
i++;
} while ( i < len );
return 0;
}
int parse_colour_duo(const char *a, GdkRGBA *col1, GdkRGBA *col2)
{
char *acopy;
int cpos;
acopy = strdup(a);
if ( acopy == NULL ) return 1;
cpos = find_comma(acopy);
if ( cpos == 0 ) {
fprintf(stderr, _("Invalid bg gradient spec '%s'\n"), a);
return 1;
}
acopy[cpos] = '\0';
if ( gdk_rgba_parse(col1, acopy) != TRUE ) {
fprintf(stderr, _("Failed to parse colour: %s\n"), acopy);
}
if ( gdk_rgba_parse(col2, &acopy[cpos+1]) != TRUE ) {
fprintf(stderr, _("Failed to parse colour: %s\n"), &acopy[cpos+1]);
}
free(acopy);
return 0;
}
Stylesheet *stylesheet_load(GFile *file)
{
JsonParser *parser;
gboolean r;
GError *err = NULL;
Stylesheet *ss;
char *everything;
gsize len;
printf("Trying stylesheet '%s'\n", g_file_get_uri(file));
ss = calloc(1, sizeof(Stylesheet));
if ( ss == NULL ) return NULL;
parser = json_parser_new();
if ( !g_file_load_contents(file, NULL, &everything, &len, NULL, NULL) ) {
fprintf(stderr, _("Failed to load stylesheet '%s'\n"),
g_file_get_uri(file));
return NULL;
}
r = json_parser_load_from_data(parser, everything, len, &err);
if ( r == FALSE ) {
fprintf(stderr, "Failed to load style sheet: '%s'\n", err->message);
return NULL;
}
ss->root = json_parser_steal_root(parser);
g_object_unref(parser);
return ss;
}
static JsonObject *find_stylesheet_object(Stylesheet *ss, const char *path,
JsonNode **freeme)
{
JsonNode *node;
JsonObject *obj;
JsonArray *array;
GError *err = NULL;
node = json_path_query(path, ss->root, &err);
array = json_node_get_array(node);
if ( json_array_get_length(array) != 1 ) {
json_node_unref(node);
fprintf(stderr, "More than one result in SS lookup (%s)!\n", path);
return NULL;
}
obj = json_array_get_object_element(array, 0);
if ( obj == NULL ) {
printf("%s not a JSON object\n", path);
json_node_unref(node);
return NULL;
}
*freeme = node;
return obj;
}
char *stylesheet_lookup(Stylesheet *ss, const char *path, const char *key)
{
JsonObject *obj;
char *ret = NULL;
JsonNode *node = NULL;
if ( ss == NULL ) {
fprintf(stderr, _("No stylesheet!\n"));
return NULL;
}
obj = find_stylesheet_object(ss, path, &node);
if ( json_object_has_member(obj, key) ) {
const gchar *v;
v = json_object_get_string_member(obj, key);
if ( v != NULL ) {
ret = strdup(v);
} else {
fprintf(stderr, "Error retrieving %s.%s\n", path, key);
}
} /* else not found, too bad */
if ( node != NULL ) json_node_unref(node);
return ret;
}
int stylesheet_set(Stylesheet *ss, const char *path, const char *key,
const char *new_val)
{
JsonObject *obj;
JsonNode *node = NULL;
int r = 1;
if ( ss == NULL ) {
fprintf(stderr, _("No stylesheet!\n"));
return 1;
}
obj = find_stylesheet_object(ss, path, &node);
if ( obj != NULL ) {
json_object_set_string_member(obj, key, new_val);
r = 0;
} /* else most likely the object (e.g. "$.slide", "$.slide.frame",
* "$.narrative" etc doesn't exist */
if ( node != NULL ) json_node_unref(node);
return r;
}
int stylesheet_delete(Stylesheet *ss, const char *path, const char *key)
{
JsonObject *obj;
JsonNode *node = NULL;
int r = 1;
if ( ss == NULL ) {
fprintf(stderr, _("No stylesheet!\n"));
return 1;
}
obj = find_stylesheet_object(ss, path, &node);
if ( obj != NULL ) {
json_object_remove_member(obj, key);
r = 0;
} /* else most likely the object (e.g. "$.slide", "$.slide.frame",
* "$.narrative" etc doesn't exist */
if ( node != NULL ) json_node_unref(node);
return r;
}
void stylesheet_free(Stylesheet *ss)
{
g_object_unref(ss->root);
free(ss);
}
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