From 9cf3fc5bf2e20de413c15db04cf83c49601638d4 Mon Sep 17 00:00:00 2001
From: Michael Drake <tlsa@netsurf-browser.org>
Date: Sat, 27 Aug 2022 17:15:26 +0100
Subject: Select: Support CSS property-wide 'revert' value

---
 src/select/select.c | 79 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 79 insertions(+)

(limited to 'src/select/select.c')

diff --git a/src/select/select.c b/src/select/select.c
index c7d59b7..bd2af96 100644
--- a/src/select/select.c
+++ b/src/select/select.c
@@ -1145,6 +1145,27 @@ failed:
 }
 
 
+static css_error css__select_revert_property(
+		css_select_state *select_state,
+		prop_state *prop_state,
+		css_origin origin,
+		enum css_pseudo_element pseudo,
+		enum css_properties_e property)
+{
+	css_error error;
+
+	error = prop_dispatch[property].copy(
+			select_state->revert[origin].style[pseudo],
+			select_state->results->styles[pseudo]);
+	if (error != CSS_OK) {
+		return error;
+	}
+
+	*prop_state = select_state->revert[origin].props[property][pseudo];
+	return CSS_OK;
+}
+
+
 /**
  * Select a style for the given node
  *
@@ -1318,6 +1339,34 @@ css_error css_select_style(css_select_ctx *ctx, void *node,
 	for (i = 0; i < CSS_N_PROPERTIES; i++) {
 		prop_state *prop = &state.props[i][CSS_PSEUDO_ELEMENT_NONE];
 
+		if (prop->explicit_default == FLAG_VALUE_REVERT) {
+			switch (prop->origin) {
+			case CSS_ORIGIN_AUTHOR:
+				error = css__select_revert_property(&state,
+					prop, CSS_ORIGIN_USER, 0, i);
+				if (error != CSS_OK) {
+					goto cleanup;
+				}
+				if (prop->explicit_default != FLAG_VALUE_REVERT) {
+					break;
+				}
+				/* Fall-through */
+			case CSS_ORIGIN_USER:
+				error = css__select_revert_property(&state,
+						prop, CSS_ORIGIN_UA, 0, i);
+				if (error != CSS_OK) {
+					goto cleanup;
+				}
+				if (prop->explicit_default != FLAG_VALUE_REVERT) {
+					break;
+				}
+				/* Fall-through */
+			case CSS_ORIGIN_UA:
+				prop->explicit_default = FLAG_VALUE_UNSET;
+				break;
+			}
+		}
+
 		if (prop->explicit_default == FLAG_VALUE_UNSET) {
 			if (prop_dispatch[i].inherited == true) {
 				prop->explicit_default = FLAG_VALUE_INHERIT;
@@ -1352,6 +1401,36 @@ css_error css_select_style(css_select_ctx *ctx, void *node,
 		for (i = 0; i < CSS_N_PROPERTIES; i++) {
 			prop_state *prop = &state.props[i][j];
 
+			if (prop->explicit_default == FLAG_VALUE_REVERT) {
+				switch (prop->origin) {
+				case CSS_ORIGIN_AUTHOR:
+					error = css__select_revert_property(
+							&state, prop,
+							CSS_ORIGIN_USER, j, i);
+					if (error != CSS_OK) {
+						goto cleanup;
+					}
+					if (prop->explicit_default != FLAG_VALUE_REVERT) {
+						break;
+					}
+					/* Fall-through */
+				case CSS_ORIGIN_USER:
+					error = css__select_revert_property(
+							&state, prop,
+							CSS_ORIGIN_UA, j, i);
+					if (error != CSS_OK) {
+						goto cleanup;
+					}
+					if (prop->explicit_default != FLAG_VALUE_REVERT) {
+						break;
+					}
+					/* Fall-through */
+				case CSS_ORIGIN_UA:
+					prop->explicit_default = FLAG_VALUE_UNSET;
+					break;
+				}
+			}
+
 			if (prop->explicit_default == FLAG_VALUE_UNSET) {
 				if (prop_dispatch[i].inherited == true) {
 					prop->explicit_default = FLAG_VALUE_INHERIT;
-- 
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