[gtk+] Add a simple commandline tool for ui files

[Matthias Clasen <matthiasc src gnome org>]

commit 8bb5a149778b90423c3f770e18e67d7b678f76d9
Author: Matthias Clasen <mclasen redhat com>
Date:   Sat Apr 18 21:03:52 2015 -0400

    Add a simple commandline tool for ui files
    
    This tool strips properties which are set to their
    default value from .ui files.

 gtk/Makefile.am        |    7 +
 gtk/gtk-builder-tool.c |  406 ++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 413 insertions(+), 0 deletions(-)
---
diff --git a/gtk/Makefile.am b/gtk/Makefile.am
index c59f63e..9e8b2a8 100644
--- a/gtk/Makefile.am
+++ b/gtk/Makefile.am
@@ -1391,6 +1391,7 @@ bin_PROGRAMS = \
        gtk-query-immodules-3.0 \
        gtk-update-icon-cache \
        gtk-encode-symbolic-svg \
+       gtk-builder-tool \
        gtk-launch
 
 gtk_query_immodules_3_0_SOURCES = queryimmodules.c
@@ -1409,6 +1410,12 @@ gtk_encode_symbolic_svg_LDADD =                  \
        $(top_builddir)/gdk/libgdk-3.la         \
        $(GTK_DEP_LIBS)
 
+gtk_builder_tool_SOURCES = gtk-builder-tool.c
+gtk_builder_tool_LDADD =                       \
+       libgtk-3.la                             \
+       $(top_builddir)/gdk/libgdk-3.la         \
+       $(GTK_DEP_LIBS)
+
 gtk_launch_SOURCES = gtk-launch.c
 gtk_launch_LDADD =                             \
        libgtk-3.la                             \
diff --git a/gtk/gtk-builder-tool.c b/gtk/gtk-builder-tool.c
new file mode 100644
index 0000000..0bea932
--- /dev/null
+++ b/gtk/gtk-builder-tool.c
@@ -0,0 +1,406 @@
+/*  Copyright 2015 Red Hat, Inc.
+ *
+ * GTK+ is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * GLib is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with GTK+; see the file COPYING.  If not,
+ * see <http://www.gnu.org/licenses/>.
+ *
+ * Author: Matthias Clasen
+ */
+
+#include <stdlib.h>
+#include <string.h>
+#include <gtk/gtk.h>
+
+
+typedef struct {
+  GtkBuilder *builder;
+  GList *classes;
+  gboolean packing;
+  gboolean packing_started;
+  gchar **attribute_names;
+  gchar **attribute_values;
+  GString *value;
+  gboolean unclosed_starttag;
+  gint indent;
+} ParserData;
+
+static gboolean
+value_is_default (ParserData *data,
+                  gint        i)
+{
+  GType type;
+  GObjectClass *class;
+  GParamSpec *pspec;
+  GValue value = { 0, };
+  gboolean ret;
+  GError *error = NULL;
+  const gchar *class_name;
+  const gchar *value_string;
+  const gchar *property_name;
+  gchar *canonical_name;
+
+  class_name = (const gchar *)data->classes->data;
+  value_string =(const gchar *)data->value->str;
+  property_name = (const gchar *)data->attribute_values[i];
+
+  type = g_type_from_name (class_name);
+  if (type == G_TYPE_INVALID)
+    return FALSE;
+
+  class = g_type_class_ref (type);
+  canonical_name = g_strdup (property_name);
+  g_strdelimit (canonical_name, "_", '-');
+  if (data->packing)
+    pspec = gtk_container_class_find_child_property (class, canonical_name);
+  else
+    pspec = g_object_class_find_property (class, canonical_name);
+  g_free (canonical_name);
+  g_type_class_unref (class);
+
+  if (pspec == NULL)
+    {
+      g_printerr ("P%sroperty %s::%s not found\n", data->packing ? "acking p" : "", class_name, 
property_name);
+      return FALSE;
+    }
+  else if (g_type_is_a (G_PARAM_SPEC_VALUE_TYPE (pspec), G_TYPE_OBJECT))
+    return FALSE;
+
+  if (!gtk_builder_value_from_string (data->builder,
+                                      pspec,
+                                      value_string,
+                                      &value,
+                                      &error))
+    {
+      g_printerr ("Error parsing value: %s\n", error->message);
+      g_error_free (error);
+      ret = FALSE;
+    }
+  else
+    ret = g_param_value_defaults (pspec, &value);
+
+  g_value_reset (&value);
+
+  return ret;
+}
+
+static void
+maybe_emit_property (ParserData *data)
+{
+  gchar *escaped;
+  gint i;
+  gboolean bound;
+
+  for (i = 0; data->attribute_names[i]; i++)
+    {
+      if (strcmp (data->attribute_names[i], "name") == 0)
+        {
+          if (data->classes == NULL)
+            break;
+
+          if (value_is_default (data, i))
+            return;
+        }
+    }
+
+  if (data->packing)
+    {
+      if (!data->packing_started)
+        {
+          g_print ("%*s<packing>\n", data->indent, "");
+          data->indent += 2;
+          data->packing_started = TRUE;
+        }
+    }
+
+  bound = FALSE;
+
+  g_print ("%*s<property", data->indent, "");
+  for (i = 0; data->attribute_names[i]; i++)
+    {
+      if (strcmp (data->attribute_names[i], "bind-source") == 0 ||
+          strcmp (data->attribute_names[i], "bind_source") == 0)
+        bound = TRUE;
+
+      escaped = g_markup_escape_text (data->attribute_values[i], -1);
+      g_print (" %s=\"%s\"", data->attribute_names[i], escaped);
+      g_free (escaped);
+    }
+
+  if (bound)
+    {
+      g_print ("/>\n");
+    }
+  else
+    {
+      escaped = g_markup_escape_text (data->value->str, -1);
+      g_print (">%s</property>\n", escaped);
+      g_free (escaped);
+    }
+}
+
+static void
+maybe_close_starttag (ParserData *data)
+{
+  if (data->unclosed_starttag)
+    {
+      g_print (">\n");
+      data->unclosed_starttag = FALSE;
+    }
+}
+
+static gboolean
+stack_is (GMarkupParseContext *context,
+          ...)
+{
+  va_list args;
+  gchar *s, *p;
+  const GSList *stack;
+
+  stack = g_markup_parse_context_get_element_stack (context);
+
+  va_start (args, context);
+  s = va_arg (args, gchar *);
+  while (s)
+    {
+      if (stack == NULL)
+        {
+          va_end (args);
+          return FALSE;
+        }
+
+      p = (gchar *)stack->data;
+      if (strcmp (s, p) != 0)
+        {
+          va_end (args);
+          return FALSE;
+        }
+
+      s = va_arg (args, gchar *);
+      stack = stack->next;
+    }
+
+  va_end (args);
+  return TRUE;
+}
+
+static void
+start_element (GMarkupParseContext  *context,
+               const gchar          *element_name,
+               const gchar         **attribute_names,
+               const gchar         **attribute_values,
+               gpointer              user_data,
+               GError              **error)
+{
+  gint i;
+  gchar *escaped;
+  ParserData *data = user_data;
+
+  maybe_close_starttag (data);
+
+  if (strcmp (element_name, "property") == 0)
+    {
+      g_assert (data->attribute_names == NULL);
+      g_assert (data->attribute_values == NULL);
+      g_assert (data->value == NULL);
+
+      data->attribute_names = g_strdupv ((gchar **)attribute_names);
+      data->attribute_values = g_strdupv ((gchar **)attribute_values);
+      data->value = g_string_new ("");
+
+      return;
+    }
+  else if (strcmp (element_name, "packing") == 0)
+    {
+      data->packing = TRUE;
+      data->packing_started = FALSE;
+
+      return;
+    }
+  else if (strcmp (element_name, "attribute") == 0)
+    {
+      /* attribute in label has no content */
+      if (data->classes == NULL ||
+          strcmp ((gchar *)data->classes->data, "GtkLabel") != 0)
+        data->value = g_string_new ("");
+    }
+  else if (stack_is (context, "item", "items", NULL) ||
+           stack_is (context, "action-widget", "action-widgets", NULL) ||
+           stack_is (context, "mime-type", "mime-types", NULL) ||
+           stack_is (context, "pattern", "patterns", NULL) ||
+           stack_is (context, "application", "applications", NULL) ||
+           stack_is (context, "col", "row", "data", NULL) ||
+           stack_is (context, "mark", "marks", NULL) ||
+           stack_is (context, "action", "accessibility", NULL))
+    {
+      data->value = g_string_new ("");
+    }
+  else if (strcmp (element_name, "object") == 0 ||
+           strcmp (element_name, "template") == 0)
+    {
+      for (i = 0; attribute_names[i]; i++)
+        {
+          if (strcmp (attribute_names[i], "class") == 0)
+            {
+              data->classes = g_list_prepend (data->classes,
+                                              g_strdup (attribute_values[i]));
+              break;
+            }
+        }
+    }
+
+  g_print ("%*s<%s", data->indent, "", element_name);
+  for (i = 0; attribute_names[i]; i++)
+    {
+      escaped = g_markup_escape_text (attribute_values[i], -1);
+      g_print (" %s=\"%s\"", attribute_names[i], escaped);
+      g_free (escaped);
+    }
+  data->unclosed_starttag = TRUE;
+  data->indent += 2;
+}
+
+static void
+end_element (GMarkupParseContext  *context,
+             const gchar          *element_name,
+             gpointer              user_data,
+             GError              **error)
+{
+  ParserData *data = user_data;
+
+  if (strcmp (element_name, "property") == 0)
+    {
+      maybe_emit_property (data);
+
+      g_clear_pointer (&data->attribute_names, g_strfreev);
+      g_clear_pointer (&data->attribute_values, g_strfreev);
+      g_string_free (data->value, TRUE);
+      data->value = NULL;
+      return;
+    }
+  else if (strcmp (element_name, "packing") == 0)
+    {
+      data->packing = FALSE;
+      if (!data->packing_started)
+        return;
+    }
+  else if (data->value != 0)
+    {
+      gchar *escaped;
+
+      escaped = g_markup_escape_text (data->value->str, -1);
+      g_print ("%s%s</%s>\n", data->unclosed_starttag ? ">" : "", escaped, element_name);
+      g_free (escaped);
+      g_string_free (data->value, TRUE);
+      data->value = NULL;
+      data->unclosed_starttag = FALSE;
+      data->indent -= 2;
+      return;
+    }
+  else if (strcmp (element_name, "object") == 0 ||
+           strcmp (element_name, "template") == 0)
+    {
+      g_free (data->classes->data);
+      data->classes = g_list_delete_link (data->classes, data->classes);
+    }
+
+  data->indent -= 2;
+
+  if (data->unclosed_starttag)
+    g_print ("/>\n");
+  else
+    g_print ("%*s</%s>\n", data->indent, "", element_name);
+
+  data->unclosed_starttag = FALSE;
+}
+
+static void
+text (GMarkupParseContext  *context,
+      const gchar          *text,
+      gsize                 text_len,
+      gpointer              user_data,
+      GError              **error)
+{
+  ParserData *data = user_data;
+
+  if (data->value)
+    {
+      g_string_append_len (data->value, text, text_len);
+      return;
+    }
+}
+
+static void
+passthrough (GMarkupParseContext  *context,
+             const gchar          *text,
+             gsize                 text_len,
+             gpointer              user_data,
+             GError              **error)
+{
+  ParserData *data = user_data;
+
+  maybe_close_starttag (data);
+
+  g_print ("%*s%s\n", data->indent, "", text);
+}
+
+GMarkupParser parser = {
+  start_element,
+  end_element,
+  text,
+  passthrough,
+  NULL
+};
+
+int
+main (int argc, char *argv[])
+{
+  GMarkupParseContext *context;
+  GError *error = NULL;
+  gchar *buffer;
+  ParserData data;
+
+  gtk_init (NULL, NULL);
+
+  gtk_test_register_all_types ();
+
+  if (argc < 2)
+    {
+      g_printerr ("No file given.\n");
+      return 1;
+    }
+
+  if (!g_file_get_contents (argv[1], &buffer, NULL, &error))
+    {
+      g_printerr ("Failed to read file: %s.\n", error->message);
+      return 1;
+    }
+
+  data.builder = gtk_builder_new ();
+  data.classes = NULL;
+  data.attribute_names = NULL;
+  data.attribute_values = NULL;
+  data.value = NULL;
+  data.packing = FALSE;
+  data.packing_started = FALSE;
+  data.unclosed_starttag = FALSE;
+  data.indent = 0;
+
+  context = g_markup_parse_context_new (&parser, G_MARKUP_TREAT_CDATA_AS_TEXT, &data, NULL);
+  if (!g_markup_parse_context_parse (context, buffer, -1, &error))
+    {
+      g_printerr ("Failed to parse file: %s.\n", error->message);
+      return 1;
+    }
+
+  return 0;
+}