From: Michael Orlitzky <michael@orlitzky.com>
Date: Thu, 12 Oct 2023 02:25:00 +0000 (-0400)
Subject: src/svgtiny_css.c: implement node_id() select handler
X-Git-Url: https://gitweb.michael.orlitzky.com/?a=commitdiff_plain;h=8a193eb5807addc9e89b5804360d1cdc72cb1889;p=libsvgtiny.git

src/svgtiny_css.c: implement node_id() select handler
---

diff --git a/src/svgtiny_css.c b/src/svgtiny_css.c
index eb45ddf..8abaa03 100644
--- a/src/svgtiny_css.c
+++ b/src/svgtiny_css.c
@@ -6,6 +6,7 @@
 static css_error node_name(void *pw, void *node, css_qname *qname);
 static css_error node_classes(void *pw, void *node,
 		lwc_string ***classes, uint32_t *n_classes);
+static css_error node_id(void *pw, void *node, lwc_string **id);
 
 
 /**
@@ -136,3 +137,46 @@ css_error node_classes(void *pw, void *node,
 
 	return CSS_OK;
 }
+
+
+/**
+ * Retrieve the given node's id
+ *
+ * \param pw    Pointer to the current SVG parser state
+ * \param node  Libdom SVG node
+ * \param id    Address at which to store the id
+ *
+ * \return      CSS_OK on success, or CSS_NOMEM if anything goes wrong
+ */
+css_error node_id(void *pw, void *node, lwc_string **id)
+{
+	dom_string *attr;
+	dom_exception err;
+	struct svgtiny_parse_state *state;
+
+	/* Begin with the assumption that this node has no id */
+	*id = NULL;
+
+	state = (struct svgtiny_parse_state *)pw;
+	err = dom_element_get_attribute((dom_node *)node,
+					state->interned_id, &attr);
+	if (err != DOM_NO_ERR) {
+		return CSS_NOMEM;
+	}
+	else if (attr == NULL) {
+		/* The node has no id attribute and our return value
+		   is already set to NULL so we're done */
+		return CSS_OK;
+	}
+
+	/* If we found an id attribute (a dom_string), intern it into
+	   an lwc_string that we can return, and then cleanup the
+	   dom_string. */
+	err = dom_string_intern(attr, id);
+	if (err != DOM_NO_ERR) {
+		dom_string_unref(attr);
+		return CSS_NOMEM;
+	}
+	dom_string_unref(attr);
+	return CSS_OK;
+}