X-Git-Url: https://gitweb.michael.orlitzky.com/?a=blobdiff_plain;f=src%2Fsvgtiny_css.c;h=cbb9a93194c4d8955537b7c22362da15a11a8700;hb=5361ccdb94335b1d0cfde6bd56b3121ba46c9535;hp=ebf432d3fa6bbfeb5e0ec5aa3b67f56ab3f5dccf;hpb=092d632d8f8e3a05e51ed536d01f8598d847ac00;p=libsvgtiny.git

diff --git a/src/svgtiny_css.c b/src/svgtiny_css.c
index ebf432d..cbb9a93 100644
--- a/src/svgtiny_css.c
+++ b/src/svgtiny_css.c
@@ -46,6 +46,12 @@ static css_error node_is_root(void *pw, void *node, bool *match);
 static css_error node_count_siblings(void *pw, void *node,
 		bool same_name, bool after, int32_t *count);
 static css_error node_is_empty(void *pw, void *node, bool *is_empty);
+static css_error node_is_link(void *pw, void *node, bool *is_link);
+static css_error node_is_hover(void *pw, void *node, bool *is_hover);
+static css_error node_is_active(void *pw, void *node, bool *is_active);
+static css_error node_is_focus(void *pw, void *node, bool *is_focus);
+static css_error node_is_enabled(void *pw, void *node, bool *is_enabled);
+static css_error node_is_disabled(void *pw, void *node, bool *is_disabled);
 
 
 /**
@@ -1426,3 +1432,164 @@ css_error node_is_empty(void *pw, void *node, bool *is_empty)
 
 	return CSS_OK;
 }
+
+
+/**
+ * Determine whether or not the given node is a link
+ *
+ * A node is a link if it is an element node whose name is "a" and if
+ * it has an "href" attribute (case-sensitive). This selector
+ * corresponds to node:link pseudo-class in CSS.
+ *
+ * This pseudo-class is a bit awkward because the two standards (HTML5
+ * and CSS) disagree on what it means, and because libsvgtiny does not
+ * have enough information to determine if a link has been "visited"
+ * yet -- that's a UI property. CSS says that :link is for unvisited
+ * links, which we can't determine. HTML5 says that each link must
+ * be either a :link or :visited. Since we can't decide either way,
+ * It seems less wrong to declare that all links are unvisited; i.e.
+ * that they match :link.
+ *
+ * \param pw          Pointer to the current SVG parser state
+ * \param node        Libdom SVG node to check
+ * \param is_link     Pointer to the boolean return value
+ *
+ * \return CSS_OK on success, or CSS_NOMEM if anything goes wrong
+ */
+css_error node_is_link(void *pw, void *node, bool *is_link)
+{
+	dom_exception exc;
+	dom_node *dnode; /* node, but with the right type */
+	dom_string *dnode_name;
+	bool has_href;
+	struct svgtiny_parse_state* state;
+
+	dnode = (dom_node *)node;
+	dnode_name = NULL;
+	has_href = false; /* assume no href attribute */
+	*is_link = false; /* assume that it's not a link */
+
+	exc = dom_node_get_node_name(dnode, &dnode_name);
+	if ((exc != DOM_NO_ERR) || (dnode_name == NULL)) {
+		return CSS_NOMEM;
+	}
+
+	state = (struct svgtiny_parse_state *)pw;
+	if (dom_string_isequal(dnode_name, state->interned_a)) {
+		exc = dom_element_has_attribute(node,
+					state->interned_href,
+					&has_href);
+		if (exc == DOM_NO_ERR && has_href) {
+			*is_link = true;
+		}
+	}
+
+	dom_string_unref(dnode_name);
+	return CSS_OK;
+}
+
+
+/**
+ * Check if the given node is being "hovered" over
+ *
+ * This check always fails because the SVG DOM does not have the
+ * necessary information (it's a UI property).
+ *
+ * \param pw          Pointer to the current SVG parser state; unused
+ * \param node        Libdom SVG node to check; unused
+ * \param is_hover    Pointer to the boolean return value
+ *
+ * \return Always returns CSS_OK
+ */
+css_error node_is_hover(void *pw, void *node, bool *is_hover)
+{
+	UNUSED(pw);
+	UNUSED(node);
+	*is_hover = false;
+	return CSS_OK;
+}
+
+
+/**
+ * Check if the given node is "active"
+ *
+ * This check always fails because the SVG DOM does not have the
+ * necessary information (it's a UI property).
+ *
+ * \param pw          Pointer to the current SVG parser state; unused
+ * \param node        Libdom SVG node to check; unused
+ * \param is_active   Pointer to the boolean return value
+ *
+ * \return Always returns CSS_OK
+ */
+css_error node_is_active(void *pw, void *node, bool *is_active)
+{
+	UNUSED(pw);
+	UNUSED(node);
+	*is_active = false;
+	return CSS_OK;
+}
+
+
+/**
+ * Check if the given node has the focus
+ *
+ * This check always fails because the SVG DOM does not have the
+ * necessary information (it's a UI property).
+ *
+ * \param pw          Pointer to the current SVG parser state; unused
+ * \param node        Libdom SVG node to check; unused
+ * \param is_focus    Pointer to the boolean return value
+ *
+ * \return Always returns CSS_OK
+ */
+css_error node_is_focus(void *pw, void *node, bool *is_focus)
+{
+	UNUSED(pw);
+	UNUSED(node);
+	*is_focus = false;
+	return CSS_OK;
+}
+
+
+/**
+ * Check if the given node is enabled
+ *
+ * This check always fails because the SVG DOM does not have the
+ * necessary information (it's a UI property).
+ *
+ * \param pw            Pointer to the current SVG parser state; unused
+ * \param node          Libdom SVG node to check; unused
+ * \param is_enabled    Pointer to the boolean return value
+ *
+ * \return Always returns CSS_OK
+ */
+css_error node_is_enabled(void *pw, void *node, bool *is_enabled)
+{
+	UNUSED(pw);
+	UNUSED(node);
+	*is_enabled = false;
+	return CSS_OK;
+}
+
+
+/**
+ * Check if the given node is disabled
+ *
+ * This check always fails because the SVG DOM does not have the
+ * necessary information (it's a UI property). Beware, until they are
+ * implemented, this is NOT the logical negation of node_is_enabled!
+ *
+ * \param pw            Pointer to the current SVG parser state; unused
+ * \param node          Libdom SVG node to check; unused
+ * \param is_disabled   Pointer to the boolean return value
+ *
+ * \return Always returns CSS_OK
+ */
+css_error node_is_disabled(void *pw, void *node, bool *is_disabled)
+{
+	UNUSED(pw);
+	UNUSED(node);
+	*is_disabled = false;
+	return CSS_OK;
+}