#include "svgtiny.h"
#include "svgtiny_internal.h"
+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);
+static css_error named_parent_node(void *pw, void *node,
+ const css_qname *qname, void **parent);
+
+
/**
* Resolve a relative URL to an absolute one by doing nothing. This is
* the simplest possible implementation of a URL resolver, needed for
return css_stylesheet_create(¶ms, sheet);
}
+
+
+/**************************/
+/* libcss select handlers */
+/**************************/
+/*
+ * From here on we implement the "select handler "API defined in
+ * libcss's include/libcss/select.h and discussed briefly in its
+ * docs/API document.
+ */
+
+
+/**
+ * Retrieve the given node's name
+ *
+ * \param pw Pointer to the current SVG parser state
+ * \param node Libdom SVG node
+ * \param qname Address at which to store the node name
+ *
+ * \return CSS_OK on success, or CSS_NOMEM if anything goes wrong
+ */
+css_error node_name(void *pw, void *node, css_qname *qname)
+{
+ dom_string *name;
+ dom_exception err;
+ struct svgtiny_parse_state *state;
+
+ err = dom_node_get_node_name((dom_node *)node, &name);
+ if (err != DOM_NO_ERR) {
+ return CSS_NOMEM;
+ }
+
+ state = (struct svgtiny_parse_state *)pw;
+ qname->ns = lwc_string_ref(state->interned_svg_xmlns);
+
+ err = dom_string_intern(name, &qname->name);
+ if (err != DOM_NO_ERR) {
+ dom_string_unref(name);
+ return CSS_NOMEM;
+ }
+
+ dom_string_unref(name);
+
+ return CSS_OK;
+}
+
+
+/**
+ * Retrieve the given node's classes
+ *
+ * \param pw Pointer to the current SVG parser state
+ * \param node Libdom SVG node
+ * \param classes Address at which to store the class name array
+ * \param n_classes Address at which to store the length of the class
+ * name array
+ *
+ * \return CSS_OK on success, or CSS_NOMEM if anything goes wrong
+ *
+ * \note CSS_NOMEM is not possible in practice as of libdom-0.4.1,
+ * because the underlying libdom function never fails
+ */
+css_error node_classes(void *pw, void *node,
+ lwc_string ***classes, uint32_t *n_classes)
+{
+ UNUSED(pw);
+ dom_exception err;
+
+ err = dom_element_get_classes((dom_node *)node, classes, n_classes);
+
+ /* The implementation does not do it, but the documentation
+ for dom_element_get_classes() says that a DOM_NO_MEM_ERR is
+ possible here, so we handle it to be on the safe side. */
+ if (err != DOM_NO_ERR) {
+ return CSS_NOMEM;
+ }
+
+ 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;
+}
+
+
+
+/**
+ * Find the first parent of the given element having the given name
+ *
+ * \param pw Pointer to the current SVG parser state
+ * \param node Libdom SVG node
+ * \param qname Name of the parent node to search for
+ * \param parent Address at which to store the parent node pointer
+ *
+ * \return Always returns CSS_OK
+ *
+ * \post If a suitable element is found, a pointer to it will be
+ * stored at the address pointed to by \a parent; otherwise,
+ * NULL will be stored at the address pointed to by \a parent
+ */
+css_error named_parent_node(void *pw, void *node,
+ const css_qname *qname, void **parent)
+{
+ UNUSED(pw);
+ /* dom_element_named_parent_node() was invented to implement
+ * this select handler so there isn't much for us to do except
+ * call it. It's OK if node isn't an element, libdom checks
+ * for it. */
+ dom_element_named_parent_node((dom_element *)node,
+ qname->name,
+ (struct dom_element **)parent);
+
+ /* Implementation detail: dom_element_named_parent_node()
+ * increments the reference count of the parent element before
+ * returning it to us. According to docs/RefCnt in the libdom
+ * repository, this will prevent the parent element from being
+ * destroyed if it is pruned from the DOM. That sounds good,
+ * since we don't want to be using a pointer to an object that
+ * has been destroyed... but we also have no way of later
+ * decrementing the reference count ourselves, and don't want
+ * to make the returned node eternal. Decrementing the
+ * reference counter now allows it to be destroyed when the
+ * DOM no longer needs it, and so long as no other parts of
+ * libsvgtiny are messing with the DOM during parsing, that
+ * shouldn't (ha ha) cause any problems. */
+ dom_node_unref(*parent);
+
+ return CSS_OK;
+}