source/composer/BSBeSAAPAnchorComposer.m

//
//  BSBeSAAPAnchorComposer.m
//  BathyScaphe
//
//  Created by Tsutomu Sawada on 08/10/12.
//  Copyright 2008 BathyScaphe Project. All rights reserved.
//  encoding="UTF-8"
//

#import "BSBeSAAPAnchorComposer.h"


@implementation BSBeSAAPAnchorComposer
static BOOL g_showsSAAPIcon = YES;

static inline NSString *convertedLinkString(NSString *saapString)
{
        NSMutableString *string = [NSMutableString stringWithString:saapString];
        [string replaceCharactersInRange:NSMakeRange(0, 4) withString:@"http"];
        return string;
}

static inline NSAttributedString *beIconAttachment(NSURL *adjustedUrl)
{
        NSImage                                         *image_;
        NSTextAttachment                        *attachment_;
        NSAttributedString                      *attrs_;
        NSTextAttachmentCell            *cell_;

        if (!adjustedUrl) return nil;
        image_ = [[NSImage alloc] initWithContentsOfURL:adjustedUrl];

        if (!image_) return nil;

        attachment_ =  [[NSTextAttachment alloc] init];
        cell_ = [[NSTextAttachmentCell alloc] initImageCell:image_];
        [image_ release];
        
        [attachment_ setAttachmentCell:cell_];
        [cell_ release];
        
        if (!attachment_ || !cell_) {
        [attachment_ release];
        return nil;
    }
        attrs_ = [NSAttributedString attributedStringWithAttachment:attachment_];
        [attachment_ release];
        if (!attrs_) return nil;
        
        return attrs_;
}

+ (BOOL)showsSAAPIcon
{
        return g_showsSAAPIcon;
}

+ (void)setShowsSAAPIcon:(BOOL)flag
{
        g_showsSAAPIcon = flag;
}

- (id)initWithRange:(NSRange)range saapLinkString:(NSString *)string
{
        if (self = [super init]) {
                m_replacingRange = range;
                m_httpLinkString = [convertedLinkString(string) retain];
        }
        return self;
}

- (void)dealloc
{
        [m_httpLinkString release];
        m_httpLinkString = nil;
        [super dealloc];
}

- (void)composeSAAPAnchorIfNeeded:(NSMutableAttributedString *)message
{
        if ([[self class] showsSAAPIcon]) {
                NSURL *url = [NSURL URLWithString:m_httpLinkString];
                NSAttributedString *attrStr = beIconAttachment(url);
                if (attrStr) {
                        [message replaceCharactersInRange:m_replacingRange withAttributedString:attrStr];
                        return;
                }
        }

        [message replaceCharactersInRange:m_replacingRange withString:@""];
}
@end