hedera/sql/sql-string.c

/*
 * Copyright (C) 2012 - Juan Ferrer Toribio
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */

#include "sql-string.h"
#include "sql-holder.h"

typedef struct
{
	gchar * start;
	gchar * end;
	SqlObject * holder;
}
HolderData;

/**
 * SECTION: sql-string
 * @Short_description: an arbitrary SQL string
 * @Title: SqlString
 * 
 * An arbitrary SQL string.
 **/
G_DEFINE_TYPE (SqlString, sql_string, SQL_TYPE_STMT);

SqlObject * sql_string_new (const gchar * sql)
{
	return g_object_new (SQL_TYPE_STRING, "sql", sql, NULL);
}

//+++++++++++++++++++++++++++++++++++++++++++++++++++ Private

static void sql_string_render (SqlString * obj, SqlRender * render)
{
	GSList * i;
	gchar * ptr = obj->sql;
	
	for (i = obj->holders; i; i = i->next)
	{
		HolderData * holder_data = i->data;
		g_string_append_len (render->buffer, ptr, holder_data->start - ptr - 1);
		ptr = holder_data->end;
		
		sql_render_add_object (render, holder_data->holder);		
	}

	sql_render_append (render, ptr);
}

static void sql_string_find_holders (SqlString * obj, GQueue * holders)
{
	GSList * i;

	for (i = obj->holders; i; i = i->next)
		sql_object_get_holders (((HolderData *) i->data)->holder);
}

static void sql_string_free_holder_data (HolderData * holder_data)
{
	g_object_unref (holder_data->holder);
	g_free (holder_data);
}

//+++++++++++++++++++++++++++++++++++++++++++++++++++ Properties

enum
{
	 PROP_SQL = 1
};

static void sql_string_set_property (SqlString * obj, guint id,
	const GValue * value, GParamSpec * pspec)
{
	switch (id)
	{
		case PROP_SQL:
		{
			gchar * i;
		
			obj->sql = g_value_dup_string (value);
		
			if (obj->sql)
			for (i = obj->sql; TRUE; i++)
			{
				switch (*i)
				{
					case '#':
					{
						gchar * ptr = ++i;
						gchar * holder_id;
						HolderData * holder_data;
					
						while (g_ascii_isalpha (*i))
							i++;
						
						holder_data = g_new (HolderData, 1);
						holder_data->start = ptr;	
						holder_data->end = i;	
						obj->holders = g_slist_prepend (obj->holders, holder_data);				
					
						holder_id = g_strndup (ptr, i - ptr);
						holder_data->holder = g_object_ref_sink (sql_holder_new (holder_id));
						g_free (holder_id);
					
						break;
					}
					case '\'':
					case '"':
					case '`':
					{
						gchar delimiter = *i;
					
						while (*(++i) != delimiter)
						{
							if (*i == '\\')
								i++;
							if (*i == '\0')
								break;
						}

						break;
					}
				}
			
				if (*i == '\0')
					break;			
			}
			
			obj->holders = g_slist_reverse (obj->holders);
			break;
		}
		default:		
			G_OBJECT_WARN_INVALID_PROPERTY_ID (obj, id, pspec);
	}
}

static void sql_string_get_property (SqlString * obj, guint id,
	GValue * value, GParamSpec * pspec)
{	
	switch (id)
	{
		case PROP_SQL:
			g_value_set_string (value, obj->sql);
			break;
		default:		
			G_OBJECT_WARN_INVALID_PROPERTY_ID (obj, id, pspec);
	}
}

//+++++++++++++++++++++++++++++++++++++++++++++++++++ Class

static void sql_string_init (SqlString * obj)
{
	obj->holders = NULL;
}

static void sql_string_finalize (SqlString * obj)
{
	g_free (obj->sql);
	g_slist_free_full (obj->holders, 
		(GDestroyNotify) sql_string_free_holder_data);
	G_OBJECT_CLASS (sql_string_parent_class)->finalize (G_OBJECT (obj));
}

static void sql_string_class_init (SqlStringClass * k)
{
	GObjectClass * klass = G_OBJECT_CLASS (k);
	klass->finalize = (GObjectFinalizeFunc) sql_string_finalize;
	klass->set_property = (GObjectSetPropertyFunc) sql_string_set_property;
	klass->get_property = (GObjectGetPropertyFunc) sql_string_get_property;
	SQL_OBJECT_CLASS (klass)->render = (SqlRenderFunc) sql_string_render;
	SQL_OBJECT_CLASS (klass)->find_holders = (SqlObjectFindHoldersFunc) sql_string_find_holders;

	g_object_class_install_property (klass, PROP_SQL,
		g_param_spec_string ("sql"
			,_("SQL")
			,_("An arbitrary SQL string")
			,NULL
			,G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY
	));
}