Make a separate library.

This is required for gtkdoc-scangobj. So far it's much like it's been
before, the main differences are that source files are in two directories
from now on and the build process has two stages.

liblogdiag/ld-diagram-symbol.c

@@ -0,0 +1,171 @@
+/*
+ * ld-diagram-symbol.c
+ *
+ * This file is a part of logdiag.
+ * Copyright Přemysl Janouch 2010 - 2011. All rights reserved.
+ *
+ * See the file LICENSE for licensing information.
+ *
+ */
+
+#include "liblogdiag.h"
+#include "config.h"
+
+
+/**
+ * SECTION:ld-diagram-symbol
+ * @short_description: A symbol object.
+ * @see_also: #LdDiagramObject
+ *
+ * #LdDiagramSymbol is an implementation of #LdDiagramObject.
+ */
+
+/*
+ * LdDiagramSymbolPrivate:
+ * @klass: The class of this symbol.
+ */
+struct _LdDiagramSymbolPrivate
+{
+	gchar *klass;
+};
+
+enum
+{
+	PROP_0,
+	PROP_CLASS
+};
+
+static void ld_diagram_symbol_get_property (GObject *object, guint property_id,
+	GValue *value, GParamSpec *pspec);
+static void ld_diagram_symbol_set_property (GObject *object, guint property_id,
+	const GValue *value, GParamSpec *pspec);
+static void ld_diagram_symbol_finalize (GObject *gobject);
+
+
+G_DEFINE_TYPE (LdDiagramSymbol, ld_diagram_symbol, LD_TYPE_DIAGRAM_OBJECT);
+
+static void
+ld_diagram_symbol_class_init (LdDiagramSymbolClass *klass)
+{
+	GObjectClass *object_class;
+	GParamSpec *pspec;
+
+	object_class = G_OBJECT_CLASS (klass);
+	object_class->get_property = ld_diagram_symbol_get_property;
+	object_class->set_property = ld_diagram_symbol_set_property;
+	object_class->finalize = ld_diagram_symbol_finalize;
+
+/**
+ * LdDiagramSymbol:class:
+ *
+ * The class of this symbol.
+ */
+	pspec = g_param_spec_string ("class", "Class",
+		"The class of this symbol.",
+		"", G_PARAM_READWRITE);
+	g_object_class_install_property (object_class, PROP_CLASS, pspec);
+
+	g_type_class_add_private (klass, sizeof (LdDiagramSymbolPrivate));
+}
+
+static void
+ld_diagram_symbol_init (LdDiagramSymbol *self)
+{
+	self->priv = G_TYPE_INSTANCE_GET_PRIVATE
+		(self, LD_TYPE_DIAGRAM_SYMBOL, LdDiagramSymbolPrivate);
+}
+
+static void
+ld_diagram_symbol_finalize (GObject *gobject)
+{
+	LdDiagramSymbol *self;
+
+	self = LD_DIAGRAM_SYMBOL (gobject);
+
+	if (self->priv->klass)
+		g_free (self->priv->klass);
+
+	/* Chain up to the parent class. */
+	G_OBJECT_CLASS (ld_diagram_symbol_parent_class)->finalize (gobject);
+}
+
+static void
+ld_diagram_symbol_get_property (GObject *object, guint property_id,
+	GValue *value, GParamSpec *pspec)
+{
+	LdDiagramSymbol *self;
+
+	self = LD_DIAGRAM_SYMBOL (object);
+	switch (property_id)
+	{
+	case PROP_CLASS:
+		g_value_set_string (value, ld_diagram_symbol_get_class (self));
+		break;
+	default:
+		G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+	}
+}
+
+static void
+ld_diagram_symbol_set_property (GObject *object, guint property_id,
+	const GValue *value, GParamSpec *pspec)
+{
+	LdDiagramSymbol *self;
+
+	self = LD_DIAGRAM_SYMBOL (object);
+	switch (property_id)
+	{
+	case PROP_CLASS:
+		ld_diagram_symbol_set_class (self, g_value_get_string (value));
+		break;
+	default:
+		G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+	}
+}
+
+
+/**
+ * ld_diagram_symbol_new:
+ * @klass: The class of the new symbol.
+ *
+ * Return value: A new #LdDiagramSymbol object.
+ */
+LdDiagramSymbol *
+ld_diagram_symbol_new (const gchar *klass)
+{
+	LdDiagramSymbol *self;
+
+	self = g_object_new (LD_TYPE_DIAGRAM_SYMBOL, NULL);
+	ld_diagram_symbol_set_class (self, klass);
+	return self;
+}
+
+/**
+ * ld_diagram_symbol_get_class:
+ * @self: An #LdDiagramSymbol object.
+ *
+ * Return value: The class of the symbol.
+ */
+const gchar *
+ld_diagram_symbol_get_class (LdDiagramSymbol *self)
+{
+	g_return_val_if_fail (LD_IS_DIAGRAM_SYMBOL (self), NULL);
+	return self->priv->klass;
+}
+
+/**
+ * ld_diagram_symbol_get_class:
+ * @self: An #LdDiagramSymbol object.
+ * @klass: The class.
+ *
+ * Set the class of the symbol.
+ */
+void
+ld_diagram_symbol_set_class (LdDiagramSymbol *self, const gchar *klass)
+{
+	g_return_if_fail (LD_IS_DIAGRAM_SYMBOL (self));
+
+	if (self->priv->klass)
+		g_free (self->priv->klass);
+	self->priv->klass = g_strdup (klass);
+}