source: trunk/PrefsPane/src/CodeEditHelper.m @ 1046

/* Copyright (C) 2008-2009 Peter Speck
 *
 * 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 3 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, see <http://www.gnu.org/licenses/>.
 */


#import "CodeEditHelper.h"
#import "JavascriptSyntaxHighlighter.h"

@implementation CodeEditHelper

static inline NSString* soft(NSString* s)
{
    return s ? s : @"";
}

- (id)initWithDelegate:(id<CodeEditDelegate>)delegate
{
    if (!(self = [super init]))
        return nil;
    _delegate = delegate;
    return self;
}

- (void)dealloc
{
    [super dealloc];
}

- (void)syntaxHighlight:(NSMutableAttributedString*)attributedString
           isJavascript:(BOOL)isJavascript
{
    //DebugNSLog(@"syntaxHighlight%@: %@", (js ? @"Javascript" : @"JavaRegExp"), [textStorage string]);
    //
    // This method is called when changing colors,
    // so we must guard against recursive calls of textStorageDidProcessEditing
    _isFormatting = YES;
    if (isJavascript)
        [JavascriptSyntaxHighlighter highlightJavascript:attributedString];
    else
        [JavascriptSyntaxHighlighter highlightJavaRegExp:attributedString];
    _isFormatting = NO;
}

- (void)syntaxHighlightJavascript:(NSTextStorage*)textStorage
{
    [self syntaxHighlight:textStorage isJavascript:YES];
}

- (void)delayedSyntaxHighlightJavascript:(NSTextStorage*)textStorage
{
    [self performSelectorOnMainThread:@selector(syntaxHighlightJavascript:)
                           withObject:textStorage
                        waitUntilDone:NO];
}

- (void)setCodeTabs:(NSTextStorage*)storage
{
    static NSMutableParagraphStyle *style = NULL;
    if (!style) {
        style = [[NSMutableParagraphStyle alloc] init];
        [style setParagraphStyle:[NSParagraphStyle defaultParagraphStyle]];
        [style setTabStops:[NSArray array]]; // delete default tabs
        for (int x = 15; x < 500; x += 15) {
            NSTextTab* tab = [[NSTextTab alloc]
                              initWithType:NSLeftTabStopType
                              location:x];
            [style addTabStop:tab];
            [tab release];
        }
    }
    [storage addAttribute:NSParagraphStyleAttributeName
                    value:style
                    range:NSMakeRange(0, [storage length])];
}

- (void)setCodeTextView:(NSTextView*)textView
               withText:(NSString*)txt
{
    static NSFont* font = NULL; // NSTextView forgets the font when using setString, so force it.
    if (!font) {
        //font = [[NSFont fontWithName:@"Monaco" size:10] retain];
        font = [[NSFont systemFontOfSize:11] retain];
    }
    [textView setString:soft(txt)];
    [textView setFont:font];
    [self setCodeTabs:[textView textStorage]];
}

- (void)textStorageDidProcessEditing:(NSNotification *)noti
{
    if (_isFormatting || ![[noti object] isKindOfClass:[NSTextStorage class]])
        return;
    NSTextStorage* ts = (NSTextStorage*)[noti object];
    if ([_delegate isJavascriptTextStorage:ts])
        [self syntaxHighlight:ts isJavascript:YES];
    [self setCodeTabs:ts];
}

// returns NULL if results in empty string.
- (NSString*)trimmedTextViewString:(NSTextView*)textView
{
    NSString* txt = [CodeEditHelper trimmedString:[textView string]];
    return [txt length] ? txt : NULL;
}

// returns NULL if results in empty string.
+ (NSString*)trimmedString:(NSString*)src
{
    NSCharacterSet* wsp = [NSCharacterSet whitespaceAndNewlineCharacterSet];
    NSInteger len = [src length];
    NSInteger end = len - 1;
    while (end >= 0 && [wsp characterIsMember:[src characterAtIndex:end]])
        end--;
    NSInteger start = 0;
    while (start <= end && [wsp characterIsMember:[src characterAtIndex:start]])
        start++;
    if (start > end)
        return NULL;
    if (start == 0 && end == len - 1)
        return src;
    return [src substringWithRange:NSMakeRange(start, end - start + 1)];
}

@end