/*

    File: MyDocument.m

Abstract: NSDocument subclass for MyDocument.nib

 Version: 1.2

Disclaimer: IMPORTANT:  This Apple software is supplied to you by Apple

Inc. ("Apple") in consideration of your agreement to the following

terms, and your use, installation, modification or redistribution of

this Apple software constitutes acceptance of these terms.  If you do

not agree with these terms, please do not use, install, modify or

redistribute this Apple software.

In consideration of your agreement to abide by the following terms, and

subject to these terms, Apple grants you a personal, non-exclusive

license, under Apple's copyrights in this original Apple software (the

"Apple Software"), to use, reproduce, modify and redistribute the Apple

Software, with or without modifications, in source and/or binary forms;

provided that if you redistribute the Apple Software in its entirety and

without modifications, you must retain this notice and the following

text and disclaimers in all such redistributions of the Apple Software.

Neither the name, trademarks, service marks or logos of Apple Inc. may

be used to endorse or promote products derived from the Apple Software

without specific prior written permission from Apple.  Except as

expressly stated in this notice, no other rights or licenses, express or

implied, are granted by Apple herein, including but not limited to any

patent rights that may be infringed by your derivative works or by other

works in which the Apple Software may be incorporated.

The Apple Software is provided by Apple on an "AS IS" basis.  APPLE

MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION

THE IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS

FOR A PARTICULAR PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND

OPERATION ALONE OR IN COMBINATION WITH YOUR PRODUCTS.

IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL

OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF

SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS

INTERRUPTION) ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION,

MODIFICATION AND/OR DISTRIBUTION OF THE APPLE SOFTWARE, HOWEVER CAUSED

AND WHETHER UNDER THEORY OF CONTRACT, TORT (INCLUDING NEGLIGENCE),

STRICT LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN ADVISED OF THE

POSSIBILITY OF SUCH DAMAGE.

Copyright (C) 2009 Apple Inc. All Rights Reserved.

*/ 

#import "MyDocument.h"

@implementation MyDocument

- (NSString *)string

{

    return string;

}

- (void)setString:(NSString *)value

{

    [value retain];

    [string release];

    string = value;

}

- (void)updateString

{

    [self setString:[textView string]];

}

- (void)updateView

{

    [textView setString:[self string]];

}

- (id)init

{

    self = [super init];

    return self;

}

- (void)dealloc

{

    [string release];

    [super dealloc];

}

- (NSString *)windowNibName

{

    return @"MyDocument";

}

- (void)windowControllerDidLoadNib:(NSWindowController *) aController

{

    [super windowControllerDidLoadNib:aController];

    if (!string) {

        [self setString:@""];

    }

    [self updateView];

}

- (NSData *)dataRepresentationOfType:(NSString *)aType

{

    [self updateString];

    return [string dataUsingEncoding:NSUTF8StringEncoding];

}

- (BOOL)loadDataRepresentation:(NSData *)data ofType:(NSString *)aType

{

    NSString *aString = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];

    if (aString == nil) {

        aString = [[NSString alloc] initWithData:data encoding:CFStringConvertEncodingToNSStringEncoding(kCFStringEncodingUTF16)];

        if (aString == nil) {

            return NO;

        }

    }

    [self setString:aString];

    [aString release];

    [self updateView];

    return YES;

}

- (void)setWithBytes:(const void *)bytes length:(unsigned)length

{

    NSString *aString = [[NSString alloc] initWithBytes:bytes length:length encoding:NSUTF8StringEncoding];

    if (aString == nil) {

        return;

    }

    [self setString:aString];

    [aString release];

    [self updateView];

}

// Reformat text using 'xmllint'

+ (NSData *)reformat:(NSData *)dataIn

{

    // make task object

    NSTask *aTask = [[NSTask alloc] init];

    // make pipes & hook them up

    NSPipe *toPipe = [NSPipe pipe];

    NSPipe *fromPipe = [NSPipe pipe];

    NSFileHandle *writing = [toPipe fileHandleForWriting];

    NSFileHandle *reading = [fromPipe fileHandleForReading];

    [aTask setStandardInput:toPipe];

    [aTask setStandardOutput:fromPipe];

    // set environment

    NSDictionary *env = [NSDictionary dictionaryWithObjectsAndKeys:@"   ", @"XMLLINT_INDENT", nil];

    [aTask setEnvironment:env];

    // set arguments

    NSMutableArray *args = [NSMutableArray array];

    [args addObject:@"--format"];

    [args addObject:@"-"];

    [aTask setArguments:args];

    // launch

    [aTask setLaunchPath:@"/usr/bin/xmllint"];

    [aTask launch];

    // grab text of doc and write it

    [writing writeData:dataIn];

    // send EOF

    [writing closeFile];

    // grab returned data and save it

    // NOTE: this is not the right way to do this in general, but may work okay in this context.

    // Basically, we are assuming that we don't need to read any output until all the input has

    // been written. Since, as far as I recall, pipes can only contain a relatively small amount

    // of data, this means we are assuming that no substantial output is done by the child process

    // until all the input data has been read. (Otherwise, the child process could block trying to

    // write output to a full pipe that no one is reading.) It is probably the case that 'xmllint'

    // reads all its input first, due to the structure of XML, but this would not be true in general.

    NSData *dataOut = [reading readDataToEndOfFile];

    // clean up task object

    [aTask terminate];  // the 'terminate' shouldn't be necessary - I think..

    [aTask release];

    return dataOut;

}

@end