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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) 2004-12  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.
 *
 *  RScriptEditorGlyphGenerator.m
 *
 *  Created by Hans-J. Bibiko on 01/03/2012.
 *
 */

#import "RScriptEditorGlyphGenerator.h"
#import "RScriptEditorTypesetter.h"
#import "PreferenceKeys.h"

static SEL _attrStrSel;

@implementation RScriptEditorGlyphGenerator

 + (void)initialize
 {
    if ([self class] == [RScriptEditorGlyphGenerator class]) {
        _attrStrSel = @selector(attributedString);
    }
 }

 - (id)init
 {
    self = [super init];

    if (self != nil) {
        _attrStrImp = [self methodForSelector:_attrStrSel];
        nullGlyph = NSNullGlyph;
    }

    return self;
 }

- (void)generateGlyphsForGlyphStorage:(id <NSGlyphStorage>)glyphStorage desiredNumberOfCharacters:(NSUInteger)nChars glyphIndex:(NSUInteger *)glyphIndex characterIndex:(NSUInteger *)charIndex
{
    // Stash the original requester
    _destination = glyphStorage;
    [[NSGlyphGenerator sharedGlyphGenerator] generateGlyphsForGlyphStorage:self desiredNumberOfCharacters:nChars glyphIndex:glyphIndex characterIndex:charIndex];
    _destination = nil;
}

// NSGlyphStorage interface
- (void)insertGlyphs:(const NSGlyph *)glyphs length:(NSUInteger)length forStartingGlyphAtIndex:(NSUInteger)glyphIndex characterIndex:(NSUInteger)charIndex
{
    NSGlyph *buffer = NULL;
    id attribute;

    // <SPEED>
    attribute = [(*_attrStrImp)(self, _attrStrSel) attribute:foldingAttributeName atIndex:charIndex effectiveRange:NULL];
    if (attribute && [attribute boolValue]) {
        NSRange effectiveRange;
        (void)[(*_attrStrImp)(self, _attrStrSel) attribute:foldingAttributeName atIndex:charIndex longestEffectiveRange:&effectiveRange inRange:NSMakeRange(0, charIndex + length)];
        NSInteger size = sizeof(NSGlyph) * length;
        buffer = NSZoneMalloc(NULL, size);
        memset_pattern4(buffer, &nullGlyph, size);
        if (effectiveRange.location == charIndex) buffer[0] = NSControlGlyph;
        glyphs = buffer;
    }

    [_destination insertGlyphs:glyphs length:length forStartingGlyphAtIndex:glyphIndex characterIndex:charIndex];

    if (buffer) NSZoneFree(NULL, buffer);
}

- (void)setIntAttribute:(NSInteger)attributeTag value:(NSInteger)val forGlyphAtIndex:(NSUInteger)glyphIndex
{
    [_destination setIntAttribute:attributeTag value:val forGlyphAtIndex:glyphIndex];
}

- (NSAttributedString *)attributedString
{
    return [_destination attributedString];
}

- (NSUInteger)layoutOptions
{
    return [_destination layoutOptions];
}

@end