From aa4b2d7b7b628407f6361c6b5c5a4ad2b0176877 Mon Sep 17 00:00:00 2001 From: Michael Orlitzky Date: Tue, 17 Oct 2023 11:35:13 -0400 Subject: [PATCH] src/svgtiny_css.c: add user handler function This function needs to be passed to dom_node_set_user_data() in set_libcss_node_data(), but we couldn't implement it before our css_select_handler was defined, because it passes the address of that select handler to css_libcss_node_data_handler(). --- src/svgtiny_css.c | 51 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 51 insertions(+) diff --git a/src/svgtiny_css.c b/src/svgtiny_css.c index 76b01d1..a5a7521 100644 --- a/src/svgtiny_css.c +++ b/src/svgtiny_css.c @@ -1860,6 +1860,57 @@ css_error ua_default_for_property(void *pw, uint32_t property, } +/** + * 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 * -- 2.44.2