#include "svgtiny.h"
#include "svgtiny_internal.h"
+/* select handler callbacks */
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_ancestor_node(void *pw, void *node,
+ const css_qname *qname, void **ancestor);
static css_error named_parent_node(void *pw, void *node,
const css_qname *qname, void **parent);
static css_error named_sibling_node(void *pw, void *node,
static css_error node_is_target(void *pw, void *node, bool *is_target);
static css_error node_is_lang(void *pw, void *node,
lwc_string *lang, bool *is_lang);
+static css_error node_presentational_hint(void *pw, void *node,
+ uint32_t *nhints, css_hint **hints);
static css_error ua_default_for_property(void *pw, uint32_t property,
css_hint *hint);
+static css_error set_libcss_node_data(void *pw, void *node,
+ void *libcss_node_data);
+static css_error get_libcss_node_data(void *pw, void *node,
+ void **libcss_node_data);
+/* select handler vtable */
+static struct css_select_handler svgtiny_select_handler;
+
+
+/* Every call to svgtiny_select_style() needs this, so let's only make
+ * one copy. */
+static const css_media media_all = {
+ .type = CSS_MEDIA_ALL,
+};
+
+/**
+ * Convenient wrapper around css_select_style()
+ *
+ * \param state The current state of the libsvgtiny parser
+ * \param node The node that we're getting styles for
+ * \param inline_sheet The inline stylesheet for the given node
+ * \param result Address at which to store the results array
+ */
+css_error svgtiny_select_style(struct svgtiny_parse_state *state,
+ dom_element *node,
+ const css_stylesheet *inline_sheet,
+ css_select_results **result)
+{
+ return css_select_style(state->select_ctx,
+ node,
+ &state->unit_ctx,
+ &media_all,
+ inline_sheet,
+ &svgtiny_select_handler,
+ state,
+ result);
+}
/**
* Resolve a relative URL to an absolute one by doing nothing. This is
}
+/**
+ * Find the first ancestor of the given element having the given name
+ *
+ * This function thinly wraps dom_element_named_ancestor_node(), which
+ * performs exactly the search we want.
+ *
+ * \param pw Pointer to the current SVG parser state
+ * \param node Libdom SVG node whose ancestor we want
+ * \param qname Name of the ancestor node to search for
+ * \param ancestor Address at which to store the ancestor 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 ancestor; otherwise,
+ * NULL will be stored at the address pointed to by \a ancestor
+ */
+css_error named_ancestor_node(void *pw, void *node,
+ const css_qname *qname, void **ancestor)
+{
+ UNUSED(pw);
+
+ /* It's OK if node isn't an element, libdom checks for it. */
+ dom_element_named_ancestor_node((dom_element *)node,
+ qname->name,
+ (struct dom_element **)ancestor);
+
+ /* A comment in named_parent_node() explains why we unref
+ * this here. */
+ dom_node_unref(*ancestor);
+
+ return CSS_OK;
+}
+
/**
* Find the first parent of the given element having the given name
}
+/**
+ * Return presentational hints for the given node
+ *
+ * Unless an SVG is being rendered from within an HTML document,
+ * there are no presentational hints. We always return an empty
+ * array (no hints).
+ *
+ * \param pw Pointer to the current SVG parser state; unused
+ * \param node Libdom SVG node whose hints we want; unused
+ * \param nhints How many hints are returned (return by reference)
+ * \param hints Array of css_hint structures (return by reference)
+ *
+ * \return Always returns CSS_OK
+ */
+css_error node_presentational_hint(void *pw, void *node,
+ uint32_t *nhints, css_hint **hints)
+{
+ UNUSED(pw);
+ UNUSED(node);
+ *nhints = 0;
+ *hints = NULL;
+ return CSS_OK;
+}
+
+
/**
* User-agent defaults for CSS properties
*
- * For the moment, we provide no defaults, because libsvgtiny does not
- * yet support any CSS properties that might need them.
+ * Ideally we would provide _no_ defaults here, because we don't yet
+ * support any CSS properties that can use them. However, we run into
+ * libcss parent/child style composition issues unless these defaults
+ * are provided. And it's harmless to provide them, so let's do it.
*
* \param pw Pointer to the current SVG parser state; unused
* \param property LibCSS property identifier; unused
css_hint *hint)
{
UNUSED(pw);
- UNUSED(property);
- UNUSED(hint);
- return CSS_INVALID;
+ switch (property) {
+ case CSS_PROP_COLOR:
+ hint->data.color = 0xff000000;
+ hint->status = CSS_COLOR_COLOR;
+ break;
+ case CSS_PROP_FONT_FAMILY:
+ hint->data.strings = NULL;
+ hint->status = CSS_FONT_FAMILY_SANS_SERIF;
+ break;
+ case CSS_PROP_QUOTES:
+ hint->data.strings = NULL;
+ hint->status = CSS_QUOTES_NONE;
+ break;
+ case CSS_PROP_VOICE_FAMILY:
+ hint->data.strings = NULL;
+ hint->status = 0;
+ break;
+ default:
+ return CSS_INVALID;
+ }
+
+ return CSS_OK;
}
+
+
+/**
+ * A "user handler" function that we pass to dom_node_set_user_data()
+ * in set_libcss_node_data(). The set_libcss_node_data() documentation
+ * says that if the node (on which data is set) is is deleted or
+ * cloned, or if its ancestors are modified, then we must call
+ * css_libcss_node_data_handler() on the user data. This function
+ * basically just checks to see which DOM event has happened and
+ * calls css_libcss_node_data_handler() when any of those criteria
+ * are met.
+ */
+static void svgtiny_dom_user_data_handler(dom_node_operation operation,
+ dom_string *key, void *data, struct dom_node *src,
+ struct dom_node *dst)
+{
+ /* We only care about the userdata that is identified by our
+ * userdata key. Unfortunately I see no obvious way to obtain
+ * the copy of the userdata key that is already interned in
+ * svgtiny_strings.h; so we duplicate it here (ugh). */
+ dom_string *str;
+ dom_string_create((const uint8_t *)"_libcss_user_data", 17, &str);
+ if (dom_string_isequal(str,key) == false || data == NULL) {
+ /* Wrong key, or no data */
+ return;
+ }
+
+ /* Check the DOM operation, and make the corresponding call to
+ * css_libcss_node_data_handler(). No error handling is done.
+ */
+ switch (operation) {
+ case DOM_NODE_CLONED:
+ css_libcss_node_data_handler(&svgtiny_select_handler,
+ CSS_NODE_CLONED,
+ NULL, src, dst, data);
+ break;
+ case DOM_NODE_RENAMED:
+ css_libcss_node_data_handler(&svgtiny_select_handler,
+ CSS_NODE_MODIFIED,
+ NULL, src, NULL, data);
+ break;
+ case DOM_NODE_IMPORTED:
+ case DOM_NODE_ADOPTED:
+ case DOM_NODE_DELETED:
+ css_libcss_node_data_handler(&svgtiny_select_handler,
+ CSS_NODE_DELETED,
+ NULL, src, NULL, data);
+ default:
+ /* Our list of cases should have been exhaustive */
+ assert(false);
+ }
+}
+
+/**
+ * Store libcss data on a node
+ *
+ * This is part of the libcss select handler API that we need to
+ * implement. It is essentially a thin dom_node_set_user_data()
+ * wrapper.
+ *
+ * \param pw Pointer to the current SVG parser state
+ * \param node Libdom SVG node on which to store the data
+ * \param libcss_node_data Pointer to the data to store
+ *
+ * \return Always returns CSS_OK
+ */
+css_error set_libcss_node_data(void *pw, void *node,
+ void *libcss_node_data)
+{
+ struct svgtiny_parse_state *state;
+ void *old_data;
+
+ /* A unique "userdata key" (a string) is used to identify this
+ * data. */
+ state = (struct svgtiny_parse_state *)pw;
+ dom_node_set_user_data((dom_node *)node,
+ state->interned_userdata_key,
+ libcss_node_data,
+ svgtiny_dom_user_data_handler,
+ &old_data);
+
+ /* dom_node_set_user_data() always returns DOM_NO_ERR */
+ return CSS_OK;
+}
+
+
+/**
+ * Retrieve libcss data from a node
+ *
+ * This is part of the libcss select handler API that we need to
+ * implement. It is essentially a thin dom_node_get_user_data()
+ * wrapper.
+ *
+ * \param pw Pointer to the current SVG parser state
+ * \param node Libdom SVG node from which to get the data
+ * \param libcss_node_data Address at which to store a pointer to the data
+ *
+ * \return Always returns CSS_OK
+ */
+css_error get_libcss_node_data(void *pw, void *node,
+ void **libcss_node_data)
+{
+ struct svgtiny_parse_state *state;
+
+ /* A unique "userdata key" (a string) is used to identify this
+ * data. */
+ state = (struct svgtiny_parse_state *)pw;
+ dom_node_get_user_data((dom_node *)node,
+ state->interned_userdata_key,
+ libcss_node_data);
+
+ /* dom_node_get_user_data() always returns DOM_NO_ERR */
+ return CSS_OK;
+}
+
+
+/**
+ * The vtable of select handler callbacks passed by libsvgtiny to
+ * css_select_style().
+ */
+static css_select_handler svgtiny_select_handler = {
+ CSS_SELECT_HANDLER_VERSION_1,
+ node_name,
+ node_classes,
+ node_id,
+ named_ancestor_node,
+ named_parent_node,
+ named_sibling_node,
+ named_generic_sibling_node,
+ parent_node,
+ sibling_node,
+ node_has_name,
+ node_has_class,
+ node_has_id,
+ node_has_attribute,
+ node_has_attribute_equal,
+ node_has_attribute_dashmatch,
+ node_has_attribute_includes,
+ node_has_attribute_prefix,
+ node_has_attribute_suffix,
+ node_has_attribute_substring,
+ node_is_root,
+ node_count_siblings,
+ node_is_empty,
+ node_is_link,
+ node_is_visited,
+ node_is_hover,
+ node_is_active,
+ node_is_focus,
+ node_is_enabled,
+ node_is_disabled,
+ node_is_checked,
+ node_is_target,
+ node_is_lang,
+ node_presentational_hint,
+ ua_default_for_property,
+ set_libcss_node_data,
+ get_libcss_node_data,
+};
+
+
projects / libsvgtiny.git / blobdiff