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[gtk/css-text-transform] css: Implement text-transform


commit a8e15f4316948aa86c2c515edc98d1e94abd40a0
Author: Matthias Clasen <mclasen redhat com>
Date:   Fri Aug 20 19:01:01 2021 -0400

    css: Implement text-transform
    
    Implement the text-transform property from
    https://www.w3.org/TR/css-text-3/#text-transform-property
    using a new Pango attribute.

 gtk/gtkcssanimatedstyle.c     |  4 ++++
 gtk/gtkcssenumvalue.c         | 52 +++++++++++++++++++++++++++++++++++++++++++
 gtk/gtkcssenumvalueprivate.h  |  3 +++
 gtk/gtkcssstaticstyle.c       |  5 +++++
 gtk/gtkcssstyle.c             | 26 ++++++++++++++++++++++
 gtk/gtkcssstyleprivate.h      |  1 +
 gtk/gtkcssstylepropertyimpl.c | 18 +++++++++++++++
 gtk/gtkcsstypesprivate.h      |  8 +++++++
 8 files changed, 117 insertions(+)
---
diff --git a/gtk/gtkcssanimatedstyle.c b/gtk/gtkcssanimatedstyle.c
index 52e0cabc3b..fd266f49be 100644
--- a/gtk/gtkcssanimatedstyle.c
+++ b/gtk/gtkcssanimatedstyle.c
@@ -216,6 +216,10 @@ gtk_css_animated_style_set_animated_value (GtkCssAnimatedStyle *animated,
       unshare_font_variant (animated);
       gtk_css_take_value (&style->font_variant->text_decoration_style, value);
       break;
+    case GTK_CSS_PROPERTY_TEXT_TRANSFORM:
+      unshare_font_variant (animated);
+      gtk_css_take_value (&style->font_variant->text_transform, value);
+      break;
     case GTK_CSS_PROPERTY_FONT_KERNING:
       unshare_font_variant (animated);
       gtk_css_take_value (&style->font_variant->font_kerning, value);
diff --git a/gtk/gtkcssenumvalue.c b/gtk/gtkcssenumvalue.c
index ce96a23e0c..dfb7a0d394 100644
--- a/gtk/gtkcssenumvalue.c
+++ b/gtk/gtkcssenumvalue.c
@@ -1568,3 +1568,55 @@ _gtk_css_font_variant_east_asian_value_get (const GtkCssValue *value)
 
   return value->value;
 }
+
+/* GtkTextTransform */
+
+static const GtkCssValueClass GTK_CSS_VALUE_TEXT_TRANSFORM = {
+  "GtkCssTextTransformValue",
+  gtk_css_value_enum_free,
+  gtk_css_value_enum_compute,
+  gtk_css_value_enum_equal,
+  gtk_css_value_enum_transition,
+  NULL,
+  NULL,
+  gtk_css_value_enum_print
+};
+
+static GtkCssValue text_transform_values[] = {
+  { &GTK_CSS_VALUE_TEXT_TRANSFORM, 1, TRUE, GTK_CSS_TEXT_TRANSFORM_NONE, "none" },
+  { &GTK_CSS_VALUE_TEXT_TRANSFORM, 1, TRUE, GTK_CSS_TEXT_TRANSFORM_LOWERCASE, "lowercase" },
+  { &GTK_CSS_VALUE_TEXT_TRANSFORM, 1, TRUE, GTK_CSS_TEXT_TRANSFORM_UPPERCASE, "uppercase" },
+  { &GTK_CSS_VALUE_TEXT_TRANSFORM, 1, TRUE, GTK_CSS_TEXT_TRANSFORM_CAPITALIZE, "capitalize" },
+};
+
+GtkCssValue *
+_gtk_css_text_transform_value_new (GtkTextTransform transform)
+{
+  g_return_val_if_fail (transform < G_N_ELEMENTS (text_transform_values), NULL);
+
+  return _gtk_css_value_ref (&text_transform_values[transform]);
+}
+
+GtkCssValue *
+_gtk_css_text_transform_value_try_parse (GtkCssParser *parser)
+{
+  guint i;
+
+  g_return_val_if_fail (parser != NULL, NULL);
+
+  for (i = 0; i < G_N_ELEMENTS (text_transform_values); i++)
+    {
+      if (gtk_css_parser_try_ident (parser, text_transform_values[i].name))
+        return _gtk_css_value_ref (&text_transform_values[i]);
+    }
+
+  return NULL;
+}
+
+GtkTextTransform
+_gtk_css_text_transform_value_get (const GtkCssValue *value)
+{
+  g_return_val_if_fail (value->class == &GTK_CSS_VALUE_TEXT_TRANSFORM, GTK_CSS_TEXT_TRANSFORM_NONE);
+
+  return value->value;
+}
diff --git a/gtk/gtkcssenumvalueprivate.h b/gtk/gtkcssenumvalueprivate.h
index a102a8650b..b6d3b0f757 100644
--- a/gtk/gtkcssenumvalueprivate.h
+++ b/gtk/gtkcssenumvalueprivate.h
@@ -115,6 +115,9 @@ GtkCssFontVariantEastAsian _gtk_css_font_variant_east_asian_try_parse_one (GtkCs
                                                                       GtkCssFontVariantEastAsian base);
 GtkCssFontVariantEastAsian _gtk_css_font_variant_east_asian_value_get     (const GtkCssValue          
*value);
 
+GtkCssValue *          _gtk_css_text_transform_value_new       (GtkTextTransform transform);
+GtkCssValue *          _gtk_css_text_transform_value_try_parse (GtkCssParser           *parser);
+GtkTextTransform       _gtk_css_text_transform_value_get       (const GtkCssValue      *value);
 G_END_DECLS
 
 #endif /* __GTK_CSS_ENUM_VALUE_PRIVATE_H__ */
diff --git a/gtk/gtkcssstaticstyle.c b/gtk/gtkcssstaticstyle.c
index 1c8dd80c56..6bde87b7a4 100644
--- a/gtk/gtkcssstaticstyle.c
+++ b/gtk/gtkcssstaticstyle.c
@@ -117,6 +117,7 @@ static const int font_variant_props[] = {
   GTK_CSS_PROPERTY_TEXT_DECORATION_LINE,
   GTK_CSS_PROPERTY_TEXT_DECORATION_COLOR,
   GTK_CSS_PROPERTY_TEXT_DECORATION_STYLE,
+  GTK_CSS_PROPERTY_TEXT_TRANSFORM,
   GTK_CSS_PROPERTY_FONT_KERNING,
   GTK_CSS_PROPERTY_FONT_VARIANT_LIGATURES,
   GTK_CSS_PROPERTY_FONT_VARIANT_POSITION,
@@ -426,6 +427,9 @@ gtk_css_static_style_set_value (GtkCssStaticStyle *sstyle,
     case GTK_CSS_PROPERTY_TEXT_DECORATION_STYLE:
       gtk_css_take_value (&style->font_variant->text_decoration_style, value);
       break;
+    case GTK_CSS_PROPERTY_TEXT_TRANSFORM:
+      gtk_css_take_value (&style->font_variant->text_transform, value);
+      break;
     case GTK_CSS_PROPERTY_FONT_KERNING:
       gtk_css_take_value (&style->font_variant->font_kerning, value);
       break;
@@ -806,6 +810,7 @@ gtk_css_font_variant_create_initial_values (void)
   values->text_decoration_line = _gtk_css_initial_value_new_compute (GTK_CSS_PROPERTY_TEXT_DECORATION_LINE, 
NULL, NULL, NULL);
   values->text_decoration_color = NULL;
   values->text_decoration_style = _gtk_css_initial_value_new_compute 
(GTK_CSS_PROPERTY_TEXT_DECORATION_STYLE, NULL, NULL, NULL);
+  values->text_transform = _gtk_css_initial_value_new_compute (GTK_CSS_PROPERTY_TEXT_TRANSFORM, NULL, NULL, 
NULL);
   values->font_kerning = _gtk_css_initial_value_new_compute (GTK_CSS_PROPERTY_FONT_KERNING, NULL, NULL, 
NULL);
   values->font_variant_ligatures = _gtk_css_initial_value_new_compute 
(GTK_CSS_PROPERTY_FONT_VARIANT_LIGATURES, NULL, NULL, NULL);
   values->font_variant_position = _gtk_css_initial_value_new_compute 
(GTK_CSS_PROPERTY_FONT_VARIANT_POSITION, NULL, NULL, NULL);
diff --git a/gtk/gtkcssstyle.c b/gtk/gtkcssstyle.c
index 0f890a005d..18035917c5 100644
--- a/gtk/gtkcssstyle.c
+++ b/gtk/gtkcssstyle.c
@@ -123,6 +123,8 @@ gtk_css_style_get_value (GtkCssStyle *style,
       return style->font_variant->text_decoration_color ? style->font_variant->text_decoration_color : 
style->core->color;
     case GTK_CSS_PROPERTY_TEXT_DECORATION_STYLE:
       return style->font_variant->text_decoration_style;
+    case GTK_CSS_PROPERTY_TEXT_TRANSFORM:
+      return style->font_variant->text_transform;
     case GTK_CSS_PROPERTY_FONT_KERNING:
       return style->font_variant->font_kerning;
     case GTK_CSS_PROPERTY_FONT_VARIANT_LIGATURES:
@@ -397,6 +399,24 @@ get_pango_underline_from_style (GtkTextDecorationStyle style)
   g_return_val_if_reached (PANGO_UNDERLINE_SINGLE);
 }
 
+static PangoTextTransform
+get_pango_text_transform_from_style (GtkTextTransform transform)
+{
+  switch (transform)
+    {
+    case GTK_CSS_TEXT_TRANSFORM_NONE:
+      return PANGO_TEXT_TRANSFORM_NONE;
+    case GTK_CSS_TEXT_TRANSFORM_LOWERCASE:
+      return PANGO_TEXT_TRANSFORM_LOWERCASE;
+    case GTK_CSS_TEXT_TRANSFORM_UPPERCASE:
+      return PANGO_TEXT_TRANSFORM_UPPERCASE;
+    case GTK_CSS_TEXT_TRANSFORM_CAPITALIZE:
+      return PANGO_TEXT_TRANSFORM_CAPITALIZE;
+    default:
+      return PANGO_TEXT_TRANSFORM_NONE;
+    }
+}
+
 static PangoOverline
 get_pango_overline_from_style (GtkTextDecorationStyle style)
 {
@@ -442,6 +462,7 @@ gtk_css_style_get_pango_attributes (GtkCssStyle *style)
   GtkCssFontVariantEastAsian east_asian;
   GString *s;
   char *settings;
+  GtkTextTransform transform;
 
   /* text-decoration */
   decoration_line = _gtk_css_text_decoration_line_value_get (style->font_variant->text_decoration_line);
@@ -640,6 +661,11 @@ gtk_css_style_get_pango_attributes (GtkCssStyle *style)
       g_string_free (s, TRUE);
     }
 
+  transform = _gtk_css_text_transform_value_get (style->font_variant->text_transform);
+
+  if (transform != GTK_CSS_TEXT_TRANSFORM_NONE)
+    attrs = add_pango_attr (attrs, pango_attr_text_transform_new (get_pango_text_transform_from_style 
(transform)));
+
   return attrs;
 }
 
diff --git a/gtk/gtkcssstyleprivate.h b/gtk/gtkcssstyleprivate.h
index 27666e9978..d0780b0208 100644
--- a/gtk/gtkcssstyleprivate.h
+++ b/gtk/gtkcssstyleprivate.h
@@ -158,6 +158,7 @@ struct _GtkCssFontVariantValues {
   GtkCssValue *text_decoration_line;
   GtkCssValue *text_decoration_color; // NULL if currentColor
   GtkCssValue *text_decoration_style;
+  GtkCssValue *text_transform;
   GtkCssValue *font_kerning;
   GtkCssValue *font_variant_ligatures;
   GtkCssValue *font_variant_position;
diff --git a/gtk/gtkcssstylepropertyimpl.c b/gtk/gtkcssstylepropertyimpl.c
index 6df32116a8..11dca13de3 100644
--- a/gtk/gtkcssstylepropertyimpl.c
+++ b/gtk/gtkcssstylepropertyimpl.c
@@ -365,6 +365,18 @@ parse_text_decoration_style (GtkCssStyleProperty *property,
   return value;
 }
 
+static GtkCssValue *
+parse_text_transform (GtkCssStyleProperty *property,
+                      GtkCssParser        *parser)
+{
+  GtkCssValue *value = _gtk_css_text_transform_value_try_parse (parser);
+
+  if (value == NULL)
+    gtk_css_parser_error_syntax (parser, "unknown text transform value");
+
+  return value;
+}
+
 static GtkCssValue *
 parse_font_kerning (GtkCssStyleProperty *property,
                     GtkCssParser        *parser)
@@ -909,6 +921,12 @@ _gtk_css_style_property_init_properties (void)
                                           GTK_CSS_AFFECTS_TEXT_ATTRS,
                                           parse_text_decoration_style,
                                           _gtk_css_text_decoration_style_value_new 
(GTK_CSS_TEXT_DECORATION_STYLE_SOLID));
+  gtk_css_style_property_register        ("text-transform",
+                                          GTK_CSS_PROPERTY_TEXT_TRANSFORM,
+                                          0,
+                                          GTK_CSS_AFFECTS_TEXT_ATTRS | GTK_CSS_AFFECTS_TEXT_SIZE,
+                                          parse_text_transform,
+                                          _gtk_css_text_transform_value_new (GTK_CSS_TEXT_TRANSFORM_NONE));
   gtk_css_style_property_register        ("font-kerning",
                                           GTK_CSS_PROPERTY_FONT_KERNING,
                                           0,
diff --git a/gtk/gtkcsstypesprivate.h b/gtk/gtkcsstypesprivate.h
index 35ae56a41c..39b21de5fa 100644
--- a/gtk/gtkcsstypesprivate.h
+++ b/gtk/gtkcsstypesprivate.h
@@ -198,6 +198,7 @@ enum { /*< skip >*/
   GTK_CSS_PROPERTY_TEXT_DECORATION_LINE,
   GTK_CSS_PROPERTY_TEXT_DECORATION_COLOR,
   GTK_CSS_PROPERTY_TEXT_DECORATION_STYLE,
+  GTK_CSS_PROPERTY_TEXT_TRANSFORM,
   GTK_CSS_PROPERTY_FONT_KERNING,
   GTK_CSS_PROPERTY_FONT_VARIANT_LIGATURES,
   GTK_CSS_PROPERTY_FONT_VARIANT_POSITION,
@@ -337,6 +338,13 @@ typedef enum /*< skip >*/ {
   GTK_CSS_TEXT_DECORATION_STYLE_WAVY
 } GtkTextDecorationStyle;
 
+typedef enum /*< skip >*/ {
+  GTK_CSS_TEXT_TRANSFORM_NONE,
+  GTK_CSS_TEXT_TRANSFORM_LOWERCASE,
+  GTK_CSS_TEXT_TRANSFORM_UPPERCASE,
+  GTK_CSS_TEXT_TRANSFORM_CAPITALIZE,
+} GtkTextTransform;
+
 /* for the order in arrays */
 typedef enum /*< skip >*/ {
   GTK_CSS_TOP,
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