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// GtkSharp.Generation.Parser.cs - The XML Parsing engine.
//
// Author: Mike Kestner <mkestner@speakeasy.net>
//
// Copyright (c) 2001-2003 Mike Kestner
// Copyright (c) 2003 Ximian Inc.
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of version 2 of the GNU General Public
// License as published by the Free Software Foundation.
//
// 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, write to the
// Free Software Foundation, Inc., 59 Temple Place - Suite 330,
// Boston, MA 02111-1307, USA.
namespace GtkSharp.Generation {
using System;
using System.Collections.Generic;
using System.IO;
using System.Xml;
public class Parser {
const int curr_parser_version = 2;
private XmlDocument Load (string filename)
{
XmlDocument doc = new XmlDocument ();
try {
Stream stream = File.OpenRead (filename);
doc.Load (stream);
stream.Close ();
} catch (XmlException e) {
Console.WriteLine ("Invalid XML file.");
Console.WriteLine (e);
doc = null;
}
return doc;
}
public IGeneratable[] Parse (string filename)
{
XmlDocument doc = Load (filename);
if (doc == null)
return null;
XmlElement root = doc.DocumentElement;
if ((root == null) || !root.HasChildNodes) {
Console.WriteLine ("No Namespaces found.");
return null;
}
int parser_version;
if (root.HasAttribute ("parser_version")) {
try {
parser_version = int.Parse (root.GetAttribute ("parser_version"));
} catch {
Console.WriteLine ("ERROR: Unable to parse parser_version attribute value \"{0}\" to a number. Input file {1} will be ignored", root.GetAttribute ("parser_version"), filename);
return null;
}
} else
parser_version = 1;
if (parser_version > curr_parser_version)
Console.WriteLine ("WARNING: The input file {0} was created by a parser that was released after this version of the generator. Consider updating the code generator if you experience problems.", filename);
var gens = new List<IGeneratable> ();
foreach (XmlNode child in root.ChildNodes) {
XmlElement elem = child as XmlElement;
if (elem == null)
continue;
switch (child.Name) {
case "namespace":
gens.AddRange (ParseNamespace (elem));
break;
case "symbol":
gens.Add (ParseSymbol (elem));
break;
default:
Console.WriteLine ("Parser::Parse - Unexpected child node: " + child.Name);
break;
}
}
return gens.ToArray ();
}
private IList<IGeneratable> ParseNamespace (XmlElement ns)
{
var result = new List<IGeneratable> ();
foreach (XmlNode def in ns.ChildNodes) {
XmlElement elem = def as XmlElement;
if (elem == null)
continue;
if (elem.GetAttributeAsBoolean ("hidden"))
continue;
bool is_opaque = elem.GetAttributeAsBoolean ("opaque");
switch (def.Name) {
case "alias":
string aname = elem.GetAttribute("cname");
string atype = elem.GetAttribute("type");
if ((aname == "") || (atype == ""))
continue;
result.Add (new AliasGen (aname, atype));
break;
case "boxed":
if (is_opaque) {
result.Add (new OpaqueGen (ns, elem));
} else {
result.Add (new BoxedGen (ns, elem));
}
break;
case "callback":
result.Add (new CallbackGen (ns, elem));
break;
case "enum":
result.Add (new EnumGen (ns, elem));
break;
case "interface":
result.Add (new InterfaceGen (ns, elem));
break;
case "object":
result.Add (new ObjectGen (ns, elem));
break;
case "class":
result.Add (new ClassGen (ns, elem));
break;
case "struct":
if (is_opaque) {
result.Add (new OpaqueGen (ns, elem));
} else {
result.Add (new StructGen (ns, elem));
}
break;
default:
Console.WriteLine ("Parser::ParseNamespace - Unexpected node: " + def.Name);
break;
}
}
return result;
}
private IGeneratable ParseSymbol (XmlElement symbol)
{
string type = symbol.GetAttribute ("type");
string cname = symbol.GetAttribute ("cname");
string name = symbol.GetAttribute ("name");
IGeneratable result = null;
if (type == "simple") {
if (symbol.HasAttribute ("default_value"))
result = new SimpleGen (cname, name, symbol.GetAttribute ("default_value"));
else {
Console.WriteLine ("Simple type element " + cname + " has no specified default value");
result = new SimpleGen (cname, name, String.Empty);
}
} else if (type == "manual")
result = new ManualGen (cname, name);
else if (type == "ownable")
result = new OwnableGen (cname, name);
else if (type == "alias")
result = new AliasGen (cname, name);
else if (type == "marshal") {
string mtype = symbol.GetAttribute ("marshal_type");
string call = symbol.GetAttribute ("call_fmt");
string from = symbol.GetAttribute ("from_fmt");
result = new MarshalGen (cname, name, mtype, call, from);
} else if (type == "struct") {
result = new ByRefGen (symbol.GetAttribute ("cname"), symbol.GetAttribute ("name"));
} else
Console.WriteLine ("Parser::ParseSymbol - Unexpected symbol type " + type);
return result;
}
}
}
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