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RTF Parser
git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/gui/trunk@5543 72102866-910b-0410-8b05-ffd578937521
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267
Source/Parsers/attributedStringConsumer.m
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267
Source/Parsers/attributedStringConsumer.m
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/* attributedStringConsumer.m
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Copyright (C) 1999 Free Software Foundation, Inc.
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Author: Stefan Bðhringer (stefan.boehringer@uni-bochum.de)
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Date: Dec 1999
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This file is part of the GNUstep GUI Library.
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with this library; see the file COPYING.LIB.
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If not, write to the Free Software Foundation,
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59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#import <Foundation/Foundation.h>
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#import <AppKit/AppKit.h>
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#import "Parsers/rtfConsumer.h"
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/* we have to satisfy the scanner with a stream reading function */
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typedef struct {
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NSString *string;
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int position;
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int length;
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} StringContext;
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static void
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initStringContext(StringContext *ctxt, NSString *string)
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{
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ctxt->string = string;
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ctxt->position = 0;
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ctxt->length = [string length];
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}
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static int
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readNSString(StringContext *ctxt)
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{
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return (ctxt->position < ctxt->length )
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? [ctxt->string characterAtIndex:ctxt->position++]: EOF;
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}
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/*
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we must implement from the rtfConsumerSkeleton.h file (Supporting files)
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this includes the yacc error handling and output
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*/
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#define CTXT ((NSMutableDictionary *)ctxt)
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#define FONTS [CTXT objectForKey:GSRTFfontDictName]
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#define RESULT [CTXT objectForKey:GSRTFresultName]
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#define GSRTFfontDictName @"fonts"
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#define GSRTFcurrentTextPosition @"textPosition"
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#define GSRTFresultName @"result"
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#define GSRTFboldRange @"boldOn"
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#define GSRTFitalicRange @"italicOn"
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#define GSRTFunderlineRange @"underlineOn"
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#define GSRTFcurrentFont @"currentFont"
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#define GSRTFdocumentAttributes @"documentAttributes"
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static NSRange MakeRangeFromAbs(int a1,int a2)
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{
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if(a1< a2) return NSMakeRange(a1,a2-a1);
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else return NSMakeRange(a2,a1-a2);
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}
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/* handle errors (this is the yacc error mech) */
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void GSRTFerror(const char *msg)
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{
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[NSException raise:NSInvalidArgumentException
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format:@"Syntax error in RTF:%s", msg];
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}
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void GSRTFgenericRTFcommand(void *ctxt, RTFcmd cmd)
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{
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fprintf(stderr, "encountered rtf cmd:%s", cmd.name);
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if (cmd.isEmpty) fprintf(stderr, " argument is empty\n");
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else fprintf(stderr, " argument is %d\n", cmd.parameter);
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}
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//Start: we're doing some initialization
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void GSRTFstart(void *ctxt)
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{
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[CTXT setObject:[NSNumber numberWithInt:0] forKey: GSRTFcurrentTextPosition];
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[CTXT setObject:[NSFont userFontOfSize:12] forKey: GSRTFcurrentFont];
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[CTXT setObject:[NSMutableDictionary dictionary] forKey: GSRTFfontDictName];
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[RESULT beginEditing];
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}
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// Finished to parse one piece of RTF.
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void GSRTFstop(void *ctxt)
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{
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//<!> close all open bolds et al.
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[RESULT beginEditing];
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}
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void GSRTFopenBlock(void *ctxt)
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{
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}
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void GSRTFcloseBlock(void *ctxt)
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{
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}
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void GSRTFmangleText(void *ctxt, const char *text)
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{
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int oldPosition=[[CTXT objectForKey: GSRTFcurrentTextPosition] intValue],
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textlen=strlen(text),
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newPosition=oldPosition + textlen;
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NSRange insertionRange=NSMakeRange(oldPosition,0);
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NSDictionary *attributes=[NSDictionary dictionaryWithObjectsAndKeys:
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[CTXT objectForKey:GSRTFcurrentFont],
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NSFontAttributeName,nil];
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[CTXT setObject:[NSNumber numberWithInt:newPosition]
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forKey: GSRTFcurrentTextPosition];
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[RESULT replaceCharactersInRange:insertionRange
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withString:[NSString stringWithCString:text]];
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[RESULT setAttributes:attributes range:NSMakeRange(oldPosition,textlen)];
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}
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void GSRTFregisterFont(void *ctxt, const char *fontName,
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RTFfontFamily family, int fontNumber)
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{
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NSMutableDictionary *fonts = FONTS;
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NSString *fontNameString;
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NSNumber *fontId = [NSNumber numberWithInt:fontNumber];
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if (!fontName || !*fontName || !fontId) // <?> fontId ist nie null
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{
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[NSException raise:NSInvalidArgumentException
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format:@"Error in RTF (font omitted?), position:%d",
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[[CTXT objectForKey:GSRTFcurrentTextPosition] intValue]];
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}
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// exclude trailing ';' from fontName
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fontNameString = [NSString stringWithCString:fontName length:strlen(fontName)-1];
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[fonts setObject:fontNameString forKey:fontId];
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}
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void GSRTFchangeFontTo(void *ctxt, int fontNumber)
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{
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NSDictionary *fonts = FONTS;
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NSNumber *fontId = [NSNumber numberWithInt:fontNumber];
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NSFont *font=[NSFont fontWithName:[fonts objectForKey:fontId]
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size:[[CTXT objectForKey:GSRTFcurrentFont] pointSize]];
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if (!font) /* we're about to set an unknown font */
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{
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[NSException raise:NSInvalidArgumentException
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format:@"Error in RTF (referring to undefined font \\f%d), position:%d",
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fontNumber,
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[[CTXT objectForKey:GSRTFcurrentTextPosition] intValue]];
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} else {
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font=[[NSFontManager sharedFontManager]
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convertFont:[CTXT objectForKey:GSRTFcurrentFont]
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toFamily:[font familyName]];
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[CTXT setObject:font forKey: GSRTFcurrentFont];
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}
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}
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// <N> fontSize is in halfpoints according to spec
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#define fs2points(a) ((a)/2.0)
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void GSRTFchangeFontSizeTo(void *ctxt, int fontSize)
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{
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[CTXT setObject:[[NSFontManager sharedFontManager]
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convertFont:[CTXT objectForKey:GSRTFcurrentFont]
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toSize:fs2points(fontSize)]
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forKey:GSRTFcurrentFont];
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}
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static NSRange rangeForContextAndAttribute(void *ctxt, NSString *attrib)
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{
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NSString *attribStartString=[CTXT objectForKey:GSRTFboldRange];
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if(!attribStartString)
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{
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NSLog(@"RTF anomality (attribute:%@ off statement unpaired with on statement), position:%d",
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attrib, [[CTXT objectForKey:GSRTFcurrentTextPosition] intValue]);
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return NSMakeRange(0, 0);
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}
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return MakeRangeFromAbs([attribStartString intValue],
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[[CTXT objectForKey:GSRTFcurrentTextPosition] intValue]);
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}
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void GSRTFhandleItalicAttribute(void *ctxt, BOOL state)
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{
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if(!state) // this indicates a bold off
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{
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[RESULT addAttribute:NSFontAttributeName
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value:[[NSFontManager sharedFontManager]
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convertFont:[CTXT objectForKey:GSRTFcurrentFont]
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toHaveTrait:NSItalicFontMask]
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range:rangeForContextAndAttribute(ctxt,GSRTFboldRange)];
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} else {
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[CTXT setObject:[CTXT objectForKey:GSRTFcurrentTextPosition] forKey:GSRTFitalicRange];
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}
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}
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void GSRTFhandleBoldAttribute(void *ctxt, BOOL state)
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{
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if(!state) // this indicates a bold off
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{
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[RESULT addAttribute:NSFontAttributeName
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value:[[NSFontManager sharedFontManager]
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convertFont:[CTXT objectForKey:GSRTFcurrentFont]
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toHaveTrait:NSBoldFontMask]
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range:rangeForContextAndAttribute(ctxt,GSRTFboldRange)];
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} else {
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[CTXT setObject:[CTXT objectForKey:GSRTFcurrentTextPosition]
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forKey:GSRTFboldRange];
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}
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}
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void GSRTFhandleDocumentAttribute(void *ctxt, int attrib)
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{
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}
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NSMutableAttributedString *attributedStringFromRTF(NSString *rtfString)
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{
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RTFscannerCtxt scanner;
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StringContext stringCtxt;
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NSMutableDictionary *myDict = [NSMutableDictionary dictionary];
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NSMutableAttributedString *result=[[NSMutableAttributedString alloc] init];
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[myDict setObject:result forKey: GSRTFresultName];
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initStringContext(&stringCtxt, rtfString);
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lexInitContext(&scanner, &stringCtxt, (int (*)(void*))readNSString);
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GSRTFparse(myDict, &scanner);
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return [result autorelease];
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}
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@implementation NSAttributedString (RTFParser)
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- (id) initWithRTF: (NSData*)data
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documentAttributes: (NSDictionary**)dict
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{
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RTFscannerCtxt scanner;
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StringContext stringCtxt;
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NSMutableDictionary *myDict = [NSMutableDictionary dictionary];
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NSString *parseString = [NSString stringWithCString:[data bytes]
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length:[data length]];
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NSMutableAttributedString *result =
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[[[NSMutableAttributedString alloc] init] autorelease];
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[myDict setObject:result forKey: GSRTFresultName];
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initStringContext(&stringCtxt, parseString);
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lexInitContext(&scanner, &stringCtxt, (int (*)(void*))readNSString);
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GSRTFparse(myDict, &scanner);
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if (dict && [myDict objectForKey:GSRTFdocumentAttributes])
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(*dict)=[myDict objectForKey:GSRTFdocumentAttributes]; // document
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[self autorelease];
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return [[[self class] alloc] initWithAttributedString:result];
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}
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@end
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