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/*

 *  R.app : a Cocoa front end to: "R A Computer Language for Statistical Data Analysis"

 *  

 *  R.app Copyright notes:

 *                     Copyright (C) 2004-5  The R Foundation

 *                     written by Stefano M. Iacus and Simon Urbanek

 *

 *                  

 *  R Copyright notes:

 *                     Copyright (C) 1995-1996   Robert Gentleman and Ross Ihaka

 *                     Copyright (C) 1998-2001   The R Development Core Team

 *                     Copyright (C) 2002-2004   The R Foundation

 *

 *  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.

 *

 *  A copy of the GNU General Public License is available via WWW at

 *  http://www.gnu.org/copyleft/gpl.html.  You can also obtain it by

 *  writing to the Free Software Foundation, Inc., 59 Temple Place,

 *  Suite 330, Boston, MA  02111-1307  USA.

 *

 *  Created by Simon Urbanek on 1/11/05.

 */

#import "REditorTextStorage.h"

#import "RGUI.h"

#import "PreferenceKeys.h"

@implementation REditorTextStorage

- (id) init

{

	self = [super init];

	if (self) {

		cont = [[NSTextStorage alloc] init];

		highlightColorAttr = nil;

		currentHighlight = -1;

		pendingHilite = -1;

		insideReplaceEdited = NO;

		[self updatePreferences];

		[[Preferences sharedPreferences] addDependent:self];

	}

	return self;

}

- (void) dealloc

{

	[[Preferences sharedPreferences] removeDependent:self];

	[[NSNotificationCenter defaultCenter] removeObserver:self];

	[cont release];

	[super dealloc];

}

// mandatory primitive methods

- (NSString*) string

{

	return [cont string];

}

- (NSDictionary *) attributesAtIndex:(NSUInteger)index effectiveRange:(NSRangePointer)aRange

{

	[super ensureAttributesAreFixedInRange:NSMakeRange(index,1)];

	return [cont attributesAtIndex:index effectiveRange:aRange];

}

- (void) replaceCharactersInRange:(NSRange)aRange withString:(NSString *)aString

{

	BOOL restoreInside;

	int origLen = [self length];

	if (currentHighlight>-1) [self resetHighlights];

	[cont replaceCharactersInRange:aRange withString:aString];

	restoreInside = insideReplaceEdited;

	insideReplaceEdited = YES;

	[super ensureAttributesAreFixedInRange:NSMakeRange(aRange.location,[aString length])];

	[self edited:NSTextStorageEditedCharacters range:aRange changeInLength:[self length] - origLen];

	insideReplaceEdited = restoreInside;

	if (pendingHilite>-1) {

		[self highlightCharacter:pendingHilite];

		pendingHilite = -1;

	}

}

/* be careful! insideReplaceEdited should be treated as a stack, because edit request via add/setAttributes are valid and can span ever begin/endEdit, so the code beolw doe NOT work as it will reset insideReplaceEdited to NO even if it is not safe! This will lead to exceptions in notification */

- (void) beginEditing

{

	SLog(@"REditorTextStorage beginEditing");

	/* we cannot do this without storing the previous state! insideReplaceEdited = YES; */

	[super beginEditing];

}

- (void) endEditing

{

	SLog(@"REditorTextStorage endEditing");

	[super endEditing];

	/* insideReplaceEdited = NO; cannot do this! it could reset an outer lock */

	if (pendingHilite>-1) {

		[self highlightCharacter:pendingHilite];

		pendingHilite = -1;

	}

	if (pendingHilite == -2) {

		[self resetHighlights];

		pendingHilite = -1;

	}

}

- (void)setAttributes:(NSDictionary *)attributes range:(NSRange)aRange

{

	BOOL restoreInside = insideReplaceEdited;

	insideReplaceEdited = YES;

	[cont setAttributes:attributes range:aRange];

	[super ensureAttributesAreFixedInRange:aRange];

	[self edited:NSTextStorageEditedAttributes range:aRange changeInLength:0];

	insideReplaceEdited = restoreInside;

}

- (void)addAttribute:(NSString *)name value:(id)value range:(NSRange)aRange

{

	BOOL restoreInside = insideReplaceEdited;

	// SLog(@"REditorTextStorage addAttribute: %@ (inside=%d)", name, insideReplaceEdited);

	insideReplaceEdited = YES;

	[cont addAttribute:name value:value range:aRange];

	[self ensureAttributesAreFixedInRange:aRange];

	[self edited:NSTextStorageEditedAttributes range:aRange changeInLength:0];

	insideReplaceEdited = restoreInside;

}

// end of primitive methods

- (BOOL)fixesAttributesLazily

{

	return YES;

}

- (NSLayoutManager*) layoutManager

{

	NSArray *lms = [self layoutManagers];

	if (lms) {

		int lmsc = [lms count];

		if (lmsc > 0) {

			if (lmsc > 1)

                NSLog(@"REditorTextStorage(%@).layoutManager: more than one LM exists, returning the first one",self);

			return [lms objectAtIndex:0];

		}

	}

	return nil;

}

-(void)resetHighlights

{

	SLog(@"REditorTextStorage resetHighlights (inside=%d)", insideReplaceEdited);

	if (insideReplaceEdited) {

		pendingHilite=-2;

		return;

	}

	if (currentHighlight>-1) {

		if (currentHighlight<[cont length]) {

			NSLayoutManager *lm = [self layoutManager];

			if (lm) {

				NSRange fr = NSMakeRange(currentHighlight,1);

				NSDictionary *d = [lm temporaryAttributesAtCharacterIndex:currentHighlight effectiveRange:&fr];

				if (!d || [d objectForKey:NSBackgroundColorAttributeName]==nil) {

					fr = NSMakeRange(0,[self length]);

					SLog(@"resetHighlights: attribute at %d not found, clearing all %d characters - better safe than sorry", currentHighlight, fr.length);

				}

				[lm removeTemporaryAttribute:NSBackgroundColorAttributeName forCharacterRange:fr];

			}

		}

		currentHighlight=-1;

	}

}

-(void)highlightCharacter: (int) pos

{

	SLog(@"REditorTextStorage highlightCharacter: %d (inside=%d)", pos, insideReplaceEdited);

	if (insideReplaceEdited) {

		pendingHilite = pos;

		return;

	}

	[self resetHighlights];

	if (pos>=0 && pos<[self length]) {

		NSLayoutManager *lm = [self layoutManager];

		if (lm) {

			currentHighlight=pos;

			[lm setTemporaryAttributes:highlightColorAttr forCharacterRange:NSMakeRange(pos, 1)];

			[self performSelector:@selector(resetBackgroundColor:) withObject:nil afterDelay:braceHighlightInterval];

		} else SLog(@"highlightCharacter: attempt to set highlight %d beyond the text range 0:%d - I refuse!", pos, [self length]-1);

	}

}

-(void)resetBackgroundColor:(id)sender

{

	[self resetHighlights];

}

- (void) updatePreferences {

	NSColor *c = [Preferences unarchivedObjectForKey: @"braceHighlightColor" withDefault: nil];

	if (!c) c=[NSColor redColor];

	if (highlightColorAttr) [highlightColorAttr release];

	highlightColorAttr = [[NSDictionary alloc] initWithObjectsAndKeys:c, NSBackgroundColorAttributeName, nil];

	showMatchingBraces = [Preferences flagForKey:showBraceHighlightingKey withDefault: YES];

	braceHighlightInterval = [Preferences floatForKey:highlightIntervalKey withDefault:0.3f];

}

@end