2 Copyright (C) 2001-2006, William Joseph.
5 This file is part of GtkRadiant.
7 GtkRadiant is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 GtkRadiant is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GtkRadiant; if not, write to the Free Software
19 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
22 #if !defined( INCLUDED_ITEXTSTREAM_H )
23 #define INCLUDED_ITEXTSTREAM_H
26 /// \brief Text-stream interfaces.
29 #include <util/buffer.h>
30 #include "generic/static.h"
32 /// \brief A read-only character-stream.
36 /// \brief Attempts to read the next \p length characters from the stream to \p buffer.
37 /// Returns the number of characters actually stored in \p buffer.
38 virtual std::size_t read( char* buffer, std::size_t length ) = 0;
41 /// \brief A write-only character-stream.
42 class TextOutputStream
45 /// \brief Attempts to write \p length characters to the stream from \p buffer.
46 /// Returns the number of characters actually read from \p buffer.
47 virtual std::size_t write( const char* buffer, std::size_t length ) = 0;
50 /// \brief Calls the overloaded function ostream_write() to perform text formatting specific to the type being written.
51 /*! Note that ostream_write() is not globally defined - it must be defined once for each type supported.\n
52 To support writing a custom type MyClass to any kind of text-output-stream with operator<<:
54 template<typename TextOutputStreamType>
55 TextOutputStreamType& ostream_write(TextOutputStreamType& ostream, const MyClass& myClass)
57 return ostream << myClass.getName() << ' ' << myClass.getText();
60 Expressing this as a template allows it to be used directly with any concrete text-output-stream type, not just the abstract TextOutputStream\n
62 This overload writes a single character to any text-output-stream - ostream_write(TextOutputStreamType& ostream, char c).
65 inline TextOutputStream& operator<<( TextOutputStream& ostream, const T& t ){
66 return ostream_write( ostream, t );
69 inline TextOutputStream& ostream_write( TextOutputStream& ostream, const u::Buffer& b ){
70 return ostream << b.c_str();
73 class NullOutputStream : public TextOutputStream
76 std::size_t write( const char*, std::size_t length ){
81 class OutputStreamHolder
83 NullOutputStream m_nullOutputStream;
84 TextOutputStream* m_outputStream;
87 : m_outputStream( &m_nullOutputStream ){
89 void setOutputStream( TextOutputStream& outputStream ){
90 m_outputStream = &outputStream;
92 TextOutputStream& getOutputStream(){
93 return *m_outputStream;
97 typedef Static<OutputStreamHolder> GlobalOutputStream;
99 /// \brief Returns the global output stream. Used to display messages to the user.
100 inline TextOutputStream& globalOutputStream(){
101 return GlobalOutputStream::instance().getOutputStream();
104 class ErrorStreamHolder : public OutputStreamHolder {};
105 typedef Static<ErrorStreamHolder> GlobalErrorStream;
107 /// \brief Returns the global error stream. Used to display error messages to the user.
108 inline TextOutputStream& globalErrorStream(){
109 return GlobalErrorStream::instance().getOutputStream();