X-Git-Url: https://gitweb.michael.orlitzky.com/?a=blobdiff_plain;f=src%2Fsvgtiny_css.c;h=3da3c8e165f34b0d6fb09cdcc04c488ecda3e0f8;hb=7b8fc7bb381c266a4f1ecde5b10bb4c09e2f9bc0;hp=4e42888d59c83925d8ce3fa77eb30cb277525cdd;hpb=884fd8bb7fd5b7df1aac30d2084281de23f3a744;p=libsvgtiny.git diff --git a/src/svgtiny_css.c b/src/svgtiny_css.c index 4e42888..3da3c8e 100644 --- a/src/svgtiny_css.c +++ b/src/svgtiny_css.c @@ -4,10 +4,13 @@ #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, @@ -57,9 +60,47 @@ static css_error node_is_checked(void *pw, void *node, bool *is_checked); 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 @@ -234,6 +275,40 @@ css_error node_id(void *pw, void *node, lwc_string **id) } +/** + * 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 @@ -1767,6 +1842,31 @@ static css_error node_is_lang(void *pw, void *node, } +/** + * 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 * @@ -1787,3 +1887,164 @@ css_error ua_default_for_property(void *pw, uint32_t property, UNUSED(hint); return CSS_INVALID; } + + +/** + * 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, +}; + +