Merge branch 'json-stylesheets'

1 files changed, 234 insertions, 0 deletions

diff --git a/src/stylesheet.c b/src/stylesheet.c
new file mode 100644
index 0000000..96172a4
--- /dev/null
+++ b/src/stylesheet.c
@@ -0,0 +1,234 @@
+/*
+ * 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);
+}
+