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kicad/include/richio.h

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/*
* This program source code file is part of KICAD, a free EDA CAD application.
*
* Copyright (C) 2007-2010 SoftPLC Corporation, Dick Hollenbeck <dick@softplc.com>
* Copyright (C) 2007 Kicad Developers, see change_log.txt for contributors.
*
* 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 2
* 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, you may find one here:
* http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
* or you may search the http://www.gnu.org website for the version 2 license,
* or you may write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
*/
#ifndef RICHIO_H_
#define RICHIO_H_
// This file defines 3 classes useful for working with DSN text files and is named
// "richio" after its author, Richard Hollenbeck, aka Dick Hollenbeck.
#include <string>
#include <vector>
// I really did not want to be dependent on wxWidgets in richio
// but the errorText needs to be wide char so wxString rules.
#include <wx/wx.h>
#include <cstdio> // FILE
/**
* Struct IOError
* is a class used to hold an error message and may be used to throw exceptions
* containing meaningful error messages.
*/
struct IOError
{
wxString errorText;
IOError( const wxChar* aMsg ) :
errorText( aMsg )
{
}
IOError( const wxString& aMsg ) :
errorText( aMsg )
{
}
};
/**
* Class LINE_READER
* is an abstract class from which implementation specific LINE_READERs may
* be derived to read single lines of text and manage a line number counter.
*/
class LINE_READER
{
protected:
unsigned length;
int lineNum;
char* line;
unsigned maxLineLength;
unsigned capacity;
wxString source; ///< origin of text lines, e.g. filename or "clipboard"
public:
/**
* Constructor LINE_READER
* builds a line reader and fixes the length of the maximum supported
* line length to @a aMaxLineLength.
*/
LINE_READER( unsigned aMaxLineLength );
virtual ~LINE_READER()
{
delete[] line;
}
/**
* Function ReadLine
* reads a line of text into the buffer and increments the line number
* counter. If the line is larger than the buffer size, then an exception
* is thrown.
* @return int - The number of bytes read, 0 at end of file.
* @throw IOError only when a line is too long.
*/
virtual int ReadLine() throw (IOError) = 0;
/**
* Function GetSource
* returns the name of the source of the lines in an abstract sense.
* This may be a file or it may be the clipboard or any other source
* of lines of text. The returned string is useful for reporting error
* messages.
*/
const wxString& GetSource()
{
return source;
}
/**
* Operator char*
* is a casting operator that returns a char* pointer to the start of the
* line buffer.
*/
operator char* ()
{
return line;
}
/**
* Function Line Number
* returns the line number of the last line read from this LINE_READER. Lines
* start from 1.
*/
int LineNumber()
{
return lineNum;
}
/**
* Function Length
* returns the number of bytes in the last line read from this LINE_READER.
*/
unsigned Length()
{
return length;
}
};
/**
* Class FILE_LINE_READER
* is a LINE_READER that reads from an open file. File must be already open
* so that this class can exist without any UI policy.
*/
class FILE_LINE_READER : public LINE_READER
{
protected:
FILE* fp; ///< I own this file
public:
/**
* Constructor FILE_LINE_READER
* takes an open FILE and the size of the desired line buffer and takes
* ownership of the open file, i.e. assumes the obligation to close it.
*
* @param aFile is an open file.
* @param aFileName is the name of the file for error reporting purposes.
* @param aMaxLineLength is the number of bytes to use in the line buffer.
*/
FILE_LINE_READER( FILE* aFile, const wxString& aFileName, unsigned aMaxLineLength );
~FILE_LINE_READER()
{
if( fp )
fclose( fp );
}
/**
* Function ReadLine
* reads a line of text into the buffer and increments the line number
* counter. If the line is larger than the buffer size, then an exception
* is thrown.
* @return int - The number of bytes read, 0 at end of file.
* @throw IOError only when a line is too long.
*/
int ReadLine() throw (IOError);
/**
* Function Rewind
* rewinds the file and resets the line number back to zero. Line number
* will go to 1 on first ReadLine().
*/
void Rewind()
{
rewind( fp );
lineNum = 0;
}
};
/**
* Class STRING_LINE_READER
* is a LINE_READER that reads from a multiline 8 bit wide std::string
*/
class STRING_LINE_READER : public LINE_READER
{
protected:
std::string lines;
size_t ndx;
public:
/**
* Constructor STRING_LINE_READER( const std::string& aString )
*
* @param aString is a source string consisting of one or more lines
* of text, where multiple lines are separated with a '\n' character.
* The last line does not necessarily need a trailing '\n'.
* @param aSource describes the source of aString for error reporting purposes
* can be anything meaninful, such as wxT( "cliboard" ).
*/
STRING_LINE_READER( const std::string& aString, const wxString& aSource ) :
LINE_READER( 4096 ),
lines( aString ),
ndx( 0 )
{
// Clipboard text should be nice and _use multiple lines_ so that
// we can report _line number_ oriented error messages when parsing.
// Therefore a line of 4096 characters max seems more than adequate.
source = aSource;
}
/**
* Function ReadLine
* reads a line of text into the buffer and increments the line number
* counter. If the line is larger than the buffer size, then an exception
* is thrown.
* @return int - The number of bytes read, 0 at end of file.
* @throw IOError only when a line is too long.
*/
int ReadLine() throw (IOError);
};
/**
* Class OUTPUTFORMATTER
* is an important interface (abstract) class used to output UTF8 text in a convenient
* way. The primary interface is "printf() - like" but with support for indentation
* control. The destination of the 8 bit wide text is up to the implementer.
* <p>
* The implementer only has to implement the write() function, but can also optionaly
* re-implement GetQuoteChar().
* <p>
* If you want to output a wxString, then use CONV_TO_UTF8() on it before passing
* it as an argument to Print().
* <p>
* Since this is an abstract interface, only classes derived from this one
* may actually be used.
*/
class OUTPUTFORMATTER
{
std::vector<char> buffer;
int sprint( const char* fmt, ... ) throw( IOError );
int vprint( const char* fmt, va_list ap ) throw( IOError );
protected:
OUTPUTFORMATTER( int aReserve = 300 ) :
buffer( aReserve, '\0' )
{
}
virtual ~OUTPUTFORMATTER() {}
/**
* Function GetQuoteChar
* performs quote character need determination according to the Specctra DSN
* specification.
* @param wrapee A string that might need wrapping on each end.
* @param quote_char A single character C string which provides the current
* quote character, should it be needed by the wrapee.
*
* @return const char* - the quote_char as a single character string, or ""
* if the wrapee does not need to be wrapped.
*/
static const char* GetQuoteChar( const char* wrapee, const char* quote_char );
/**
* Function write
* should be coded in the interface implementation (derived) classes.
*
* @param aOutBuf is the start of a byte buffer to write.
* @param aCount tells how many bytes to write.
* @throw IOError, if there is a problem outputting, such as a full disk.
*/
virtual void write( const char* aOutBuf, int aCount ) throw( IOError ) = 0;
#if defined(__GNUG__) // The GNU C++ compiler defines this
// When used on a C++ function, we must account for the "this" pointer,
// so increase the STRING-INDEX and FIRST-TO_CHECK by one.
// See http://docs.freebsd.org/info/gcc/gcc.info.Function_Attributes.html
// Then to get format checking during the compile, compile with -Wall or -Wformat
#define PRINTF_FUNC __attribute__ ((format (printf, 3, 4)))
#else
#define PRINTF_FUNC // nothing
#endif
public:
//-----<interface functions>------------------------------------------
/**
* Function Print
* formats and writes text to the output stream.
*
* @param nestLevel The multiple of spaces to preceed the output with.
* @param fmt A printf() style format string.
* @param ... a variable list of parameters that will get blended into
* the output under control of the format string.
* @return int - the number of characters output.
* @throw IOError, if there is a problem outputting, such as a full disk.
*/
int PRINTF_FUNC Print( int nestLevel, const char* fmt, ... ) throw( IOError );
/**
* Function GetQuoteChar
* performs quote character need determination.
* It returns the quote character as a single character string for a given
* input wrapee string. If the wrappee does not need to be quoted,
* the return value is "" (the null string), such as when there are no
* delimiters in the input wrapee string. If you want the quote_char
* to be assuredly not "", then pass in "(" as the wrappee.
* <p>
* Implementations are free to override the default behavior, which is to
* call the static function of the same name.
* @param wrapee A string that might need wrapping on each end.
* @return const char* - the quote_char as a single character string, or ""
* if the wrapee does not need to be wrapped.
*/
virtual const char* GetQuoteChar( const char* wrapee )
{
return GetQuoteChar( wrapee, "\"" );
}
/**
* Function Quoted
* checks \a aWrapee input string for a need to be quoted
* (e.g. contains a ')' character or a space), and for \" double quotes
* within the string that need to be doubled up such that the DSNLEXER
* will correctly parse the string from a file later.
*
* @param aWrapee is a string that might need wraping in double quotes,
* and it might need to have its internal quotes doubled up, or not.
* Caller's copy may be modified, or not.
*
* @return const char* - useful for passing to printf() style functions that
* must output utf8 streams.
* @throw IOError, if aWrapee has any \r or \n bytes in it which is
* illegal according to the DSNLEXER who does not ever want them
* within a string.
*/
virtual const char* Quoted( std::string* aWrapee ) throw( IOError );
//-----</interface functions>-----------------------------------------
};
/**
* Class STRING_FORMATTER
* implements OUTPUTFORMATTER to a memory buffer. After Print()ing the
* string is available through GetString()
*/
class STRING_FORMATTER : public OUTPUTFORMATTER
{
std::string mystring;
public:
/**
* Constructor STRING_FORMATTER
* reserves space in the buffer
*/
STRING_FORMATTER( int aReserve = 300 ) :
OUTPUTFORMATTER( aReserve )
{
}
/**
* Function Clear
* clears the buffer and empties the internal string.
*/
void Clear()
{
mystring.clear();
}
/**
* Function StripUseless
* removes whitespace, '(', and ')' from the mystring.
*/
void StripUseless();
std::string GetString()
{
return mystring;
}
//-----<OUTPUTFORMATTER>------------------------------------------------
protected:
void write( const char* aOutBuf, int aCount ) throw( IOError );
//-----</OUTPUTFORMATTER>-----------------------------------------------
};
/**
* Class STREAM_OUTPUTFORMATTER
* implements OUTPUTFORMATTER to a wxWidgets wxOutputStream. The stream is
* neither opened nor closed by this class.
*/
class STREAM_OUTPUTFORMATTER : public OUTPUTFORMATTER
{
wxOutputStream& os;
char quoteChar[2];
public:
/**
* Constructor STREAM_OUTPUTFORMATTER
* can take any number of wxOutputStream derivations, so it can write
* to a file, socket, or zip file.
*/
STREAM_OUTPUTFORMATTER( wxOutputStream& aStream, char aQuoteChar = '"' ) :
os( aStream )
{
quoteChar[0] = aQuoteChar;
quoteChar[1] = 0;
}
//-----<OUTPUTFORMATTER>------------------------------------------------
const char* GetQuoteChar( const char* wrapee );
protected:
void write( const char* aOutBuf, int aCount ) throw( IOError );
//-----</OUTPUTFORMATTER>-----------------------------------------------
};
#endif // RICHIO_H_
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