[gnome-builder] code-insight: allow semantic highlighting to be disabled

[Christian Hergert <chergert src gnome org>]

commit 7d2b92860b9f41293041663919fcf2605420dbe9
Author: Christian Hergert <christian hergert me>
Date:   Sat May 16 03:45:53 2015 -0700

    code-insight: allow semantic highlighting to be disabled
    
    This gives us a quick and dirty control knob. Obviously default to on.

 .../org.gnome.builder.code-insight.gschema.xml     |    5 ++
 data/ui/gb-preferences-page-insight.ui             |   11 +++
 libide/ide-highlight-engine.c                      |   68 ++++++++++++++++++-
 3 files changed, 80 insertions(+), 4 deletions(-)
---
diff --git a/data/gsettings/org.gnome.builder.code-insight.gschema.xml 
b/data/gsettings/org.gnome.builder.code-insight.gschema.xml
index 7706af4..7f69aed 100644
--- a/data/gsettings/org.gnome.builder.code-insight.gschema.xml
+++ b/data/gsettings/org.gnome.builder.code-insight.gschema.xml
@@ -15,5 +15,10 @@
       <summary>Enable auto-completion of words in document</summary>
       <description>If enabled, words within the current document will be available for 
auto-completion.</description>
     </key>
+    <key name="semantic-highlighting" type="b">
+      <default>true</default>
+      <summary>Enable semantic highlighting</summary>
+      <description>If enabled, additional highlighting will be provided in supported languages based on 
information extracted from the source code.</description>
+    </key>
   </schema>
 </schemalist>
diff --git a/data/ui/gb-preferences-page-insight.ui b/data/ui/gb-preferences-page-insight.ui
index d94507a..1a62a59 100644
--- a/data/ui/gb-preferences-page-insight.ui
+++ b/data/ui/gb-preferences-page-insight.ui
@@ -9,9 +9,20 @@
         <property name="orientation">vertical</property>
         <property name="spacing">6</property>
         <child>
+          <object class="GbPreferencesSwitch" id="semantic_highlighting">
+            <property name="settings">insight_settings</property>
+            <property name="settings-schema-key">semantic-highlighting</property>
+            <property name="title" translatable="yes">Semantic Language Highlighting</property>
+            <property name="description" translatable="yes">Highlight additional syntax based upon 
information found in the document.</property>
+            <property name="size-group">control_group</property>
+            <property name="visible">true</property>
+          </object>
+        </child>
+        <child>
           <object class="GtkLabel">
             <property name="visible">true</property>
             <property name="label" translatable="yes">Auto Completion</property>
+            <property name="margin-top">12</property>
             <property name="margin-bottom">6</property>
             <property name="xalign">0.0</property>
             <style>
diff --git a/libide/ide-highlight-engine.c b/libide/ide-highlight-engine.c
index fe1a43d..04f562d 100644
--- a/libide/ide-highlight-engine.c
+++ b/libide/ide-highlight-engine.c
@@ -36,6 +36,7 @@ struct _IdeHighlightEngine
 
   IdeBuffer      *buffer;
   IdeHighlighter *highlighter;
+  GSettings      *settings;
 
   GtkTextMark    *invalid_begin;
   GtkTextMark    *invalid_end;
@@ -46,6 +47,8 @@ struct _IdeHighlightEngine
   guint64         quanta_expiration;
 
   guint           work_timeout;
+
+  guint           enabled : 1;
 };
 
 G_DEFINE_TYPE (IdeHighlightEngine, ide_highlight_engine, G_TYPE_OBJECT)
@@ -357,10 +360,12 @@ ide_highlight_engine_work_timeout_handler (gpointer data)
 
   g_assert (IDE_IS_HIGHLIGHT_ENGINE (self));
 
-  if (ide_highlight_engine_tick (self))
-    return G_SOURCE_CONTINUE;
-
-  self->work_timeout = 0;
+  if (self->enabled)
+    {
+      if (ide_highlight_engine_tick (self))
+        return G_SOURCE_CONTINUE;
+      self->work_timeout = 0;
+    }
 
   return G_SOURCE_REMOVE;
 }
@@ -388,6 +393,9 @@ invalidate_and_highlight (IdeHighlightEngine *self,
   g_assert (begin != NULL);
   g_assert (end != NULL);
 
+  if (!self->enabled)
+    return FALSE;
+
   if (get_invalidation_area (begin, end))
     {
       GtkTextIter begin_tmp;
@@ -551,6 +559,29 @@ ide_highlight_engine__notify_style_scheme_cb (IdeHighlightEngine *self,
 }
 
 static void
+ide_highlight_engine_clear (IdeHighlightEngine *self)
+{
+  GtkTextIter begin;
+  GtkTextIter end;
+
+  g_assert (IDE_IS_HIGHLIGHT_ENGINE (self));
+
+  if (self->buffer != NULL)
+    {
+      GtkTextBuffer *buffer = GTK_TEXT_BUFFER (self->buffer);
+      GSList *iter;
+
+      gtk_text_buffer_get_bounds (GTK_TEXT_BUFFER (self->buffer), &begin, &end);
+
+      for (iter = self->private_tags; iter; iter = iter->next)
+        gtk_text_buffer_remove_tag (buffer, iter->data, &begin, &end);
+
+      for (iter = self->public_tags; iter; iter = iter->next)
+        gtk_text_buffer_remove_tag (buffer, iter->data, &begin, &end);
+    }
+}
+
+static void
 ide_highlight_engine_connect_buffer (IdeHighlightEngine *self,
                                      IdeBuffer          *buffer)
 {
@@ -679,6 +710,26 @@ ide_highlight_engine_set_buffer (IdeHighlightEngine *self,
 }
 
 static void
+ide_highlight_engine_settings_changed (IdeHighlightEngine *self,
+                                       const gchar        *key,
+                                       GSettings          *settings)
+{
+  g_assert (IDE_IS_HIGHLIGHT_ENGINE (self));
+  g_assert (G_IS_SETTINGS (settings));
+
+  if (g_settings_get_boolean (settings, "semantic-highlighting"))
+    {
+      self->enabled = TRUE;
+      ide_highlight_engine_rebuild (self);
+    }
+  else
+    {
+      self->enabled = FALSE;
+      ide_highlight_engine_clear (self);
+    }
+}
+
+static void
 ide_highlight_engine_dispose (GObject *object)
 {
   IdeHighlightEngine *self = (IdeHighlightEngine *)object;
@@ -694,6 +745,7 @@ ide_highlight_engine_finalize (GObject *object)
   IdeHighlightEngine *self = (IdeHighlightEngine *)object;
 
   g_clear_object (&self->highlighter);
+  g_clear_object (&self->settings);
   ide_clear_weak_pointer (&self->buffer);
 
   G_OBJECT_CLASS (ide_highlight_engine_parent_class)->finalize (object);
@@ -777,6 +829,14 @@ ide_highlight_engine_class_init (IdeHighlightEngineClass *klass)
 static void
 ide_highlight_engine_init (IdeHighlightEngine *self)
 {
+  self->settings = g_settings_new ("org.gnome.builder.code-insight");
+  self->enabled = g_settings_get_boolean (self->settings, "semantic-highlighting");
+
+  g_signal_connect_object (self->settings,
+                           "changed::semantic-highlighting",
+                           G_CALLBACK (ide_highlight_engine_settings_changed),
+                           self,
+                           G_CONNECT_SWAPPED);
 }
 
 IdeHighlightEngine *