From c14f3c4e05d3a6f38fbd84a2bee78895d8120619 Mon Sep 17 00:00:00 2001
From: Michael Drake <tlsa@netsurf-browser.org>
Date: Sat, 27 Aug 2022 16:07:40 +0100
Subject: Select: Clone UA and author styles for revert

---
 src/select/select.c | 30 ++++++++++++++++++++++++++++++
 src/select/select.h |  8 ++++++++
 2 files changed, 38 insertions(+)

(limited to 'src')

diff --git a/src/select/select.c b/src/select/select.c
index 7b5b71a..c7d59b7 100644
--- a/src/select/select.c
+++ b/src/select/select.c
@@ -1019,6 +1019,15 @@ static void css_select__finalise_selection_state(
 	if (state->element.name != NULL){
 		lwc_string_unref(state->element.name);
 	}
+
+	for (size_t i = 0; i < CSS_ORIGIN_AUTHOR; i++) {
+		for (size_t j = 0; j < CSS_PSEUDO_ELEMENT_COUNT; j++) {
+			if (state->revert[i].style[j] == NULL) {
+				continue;
+			}
+			css_computed_style_destroy(state->revert[i].style[j]);
+		}
+	}
 }
 
 
@@ -1164,6 +1173,7 @@ css_error css_select_style(css_select_ctx *ctx, void *node,
 		css_select_handler *handler, void *pw,
 		css_select_results **result)
 {
+	css_origin origin = CSS_ORIGIN_UA;
 	uint32_t i, j, nhints;
 	css_error error;
 	css_select_state state;
@@ -1242,9 +1252,29 @@ css_error css_select_style(css_select_ctx *ctx, void *node,
 	/* Iterate through the top-level stylesheets, selecting styles
 	 * from those which apply to our current media requirements and
 	 * are not disabled */
+	if (ctx->n_sheets > 0) {
+		origin = ctx->sheets[0].origin;
+	}
 	for (i = 0; i < ctx->n_sheets; i++) {
 		const css_select_sheet s = ctx->sheets[i];
 
+		if (s.origin != origin) {
+			for (j = 0; j < CSS_PSEUDO_ELEMENT_COUNT; j++) {
+				if (state.results->styles[j] == NULL) {
+					continue;
+				}
+				error = css__computed_style_clone(
+						state.results->styles[j],
+						&state.revert[origin].style[j]);
+				if (error != CSS_OK) {
+					goto cleanup;
+				}
+				memcpy(state.revert[origin].props,
+				       state.props, sizeof(state.props));
+			}
+			origin = s.origin;
+		}
+
 		if (mq__list_match(s.media, unit_ctx, media, &ctx->str) &&
 				s.sheet->disabled == false) {
 			error = select_from_sheet(ctx, s.sheet,
diff --git a/src/select/select.h b/src/select/select.h
index f449534..69bf4d8 100644
--- a/src/select/select.h
+++ b/src/select/select.h
@@ -58,6 +58,11 @@ struct css_node_data {
 	css_node_flags flags;
 };
 
+struct revert_data {
+	prop_state props[CSS_N_PROPERTIES][CSS_PSEUDO_ELEMENT_COUNT];
+	css_computed_style *style[CSS_PSEUDO_ELEMENT_COUNT];
+};
+
 /**
  * Selection state
  */
@@ -67,6 +72,9 @@ typedef struct css_select_state {
 	const css_unit_ctx *unit_ctx;	/* Unit conversion context. */
 	css_select_results *results;	/* Result set to populate */
 
+	/** UA and user styles for handling revert property value. */
+	struct revert_data revert[CSS_ORIGIN_AUTHOR];
+
 	css_pseudo_element current_pseudo;	/* Current pseudo element */
 	css_computed_style *computed;	/* Computed style to populate */
 
-- 
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