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-rw-r--r--src/select/mq.h43
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diff --git a/src/select/mq.h b/src/select/mq.h
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+/*
+ * This file is part of LibCSS
+ * Licensed under the MIT License,
+ * http://www.opensource.org/licenses/mit-license.php
+ *
+ * Copyright 2018 Michael Drake <tlsa@netsurf-browser.org>
+ */
+
+#ifndef css_select_mq_h_
+#define css_select_mq_h_
+
+/**
+ * Test whether the rule applies for current media.
+ *
+ * \param rule Rule to test
+ * \meaid media Current media type(s)
+ * \return true iff chain's rule applies for media
+ */
+static inline bool mq_rule_good_for_media(const css_rule *rule, uint64_t media)
+{
+ bool applies = true;
+ const css_rule *ancestor = rule;
+
+ while (ancestor != NULL) {
+ const css_rule_media *m = (const css_rule_media *) ancestor;
+
+ if (ancestor->type == CSS_RULE_MEDIA &&
+ (m->media & media) == 0) {
+ applies = false;
+ break;
+ }
+
+ if (ancestor->ptype != CSS_RULE_PARENT_STYLESHEET) {
+ ancestor = ancestor->parent;
+ } else {
+ ancestor = NULL;
+ }
+ }
+
+ return applies;
+}
+
+#endif