/*

 Copyright (C) 2015 Apple Inc. All Rights Reserved.

 See LICENSE.txt for this sample’s licensing information

 Abstract:

 Utility class for loading a text file.

 */

#import <iostream>

#import <string>

#import "NSTextFile.h"

@implementation NSTextFile

{

@private

    std::string m_String;

}

- (BOOL) _newStringWithURL:(nullable NSURL *)url

{

    NSError* error = nil;

    NSString* string = [NSString stringWithContentsOfURL:url

                                                encoding:NSASCIIStringEncoding

                                                   error:&error];

    if(error)

    {

        NSLog(@">> %@", error.description);

        [error release];

        return NO;

    } // if

    else

    {

        m_String = string.UTF8String;

    } // else

    return YES;

} // _newStringWithURL

- (BOOL) _newStringWithFile:(nullable NSString *)path

{

    NSError* error = nil;

    NSString* string = [NSString stringWithContentsOfFile:path

                                                 encoding:NSASCIIStringEncoding

                                                    error:&error];

    if(error)

    {

        NSLog(@">> %@", error.description);

        [error release];

        return NO;

    } // if

    else

    {

        m_String = string.UTF8String;

    } // else

    return YES;

} // _newStringWithFile

- (BOOL) _newStringWithResource:(nullable NSString *)name

                            ext:(nullable NSString *)ext

{

    if(name && ext)

    {

        // Acquire the absolute pathname to the resource in application's bundle

        NSString* rsrc = [[NSBundle mainBundle] resourcePath];

        NSString* path = [NSString stringWithFormat:@"%@/%@.%@", rsrc, name, ext];

        return [self _newStringWithFile:path];

    } // if

    return NO;

} // _newStringWithResource

// Load a text file located at a URL

- (nullable instancetype) initWithURL:(nullable NSURL *)url;

{

    self = [super init];

    if(self)

    {

        if(![self _newStringWithURL:url])

        {

            NSLog(@">> ERROR: Failed acquiring sources from the url <%@>", url.absoluteString);

        } // if

    } // if

    return self;

} // initWithURL

+ (nullable instancetype) textWithURL:(nullable NSURL *)url

{

    return [[[NSTextFile allocWithZone:[self zone]] initWithURL:url] autorelease];

} // textWithURL

// Create a shader from a source file located at an absolute path

- (nullable instancetype) initWithFile:(nullable NSString *)path

{

    self = [super init];

    if(self)

    {

        if(![self _newStringWithFile:path])

        {

            NSLog(@">> ERROR: Failed acquiring sources from the file at pathname \"%@\"", path);

        } // if

    } // if

    return self;

} // initWithFile

+ (nullable instancetype) textWithFile:(nullable NSString *)path

{

    return [[[NSTextFile allocWithZone:[self zone]] initWithFile:path] autorelease];

} // NSTextFile

// Create a shader from a source file in application's bundle

- (nullable instancetype) initWithResource:(nullable NSString *)name

                                       ext:(nullable NSString *)ext

{

    self = [super init];

    if(self)

    {

        if(![self _newStringWithResource:name ext:ext])

        {

            NSLog(@">> ERROR: Failed acquiring sources from the \"%@.%@\' at application's bunble!", name, ext);

        } // if

    } // if

    return self;

} // initWithResource

+ (nullable instancetype) textWithResource:(nullable NSString *)name

                                       ext:(nullable NSString *)ext

{

    return [[[NSTextFile allocWithZone:[self zone]] initWithResource:name ext:ext] autorelease];

} // textWithResource

// Destructor

- (void) dealloc

{

    if(!m_String.empty())

    {

        m_String.clear();

    } // if

    [super dealloc];

} // dealloc

// Text file content

- (nullable const char *) source

{

    return m_String.c_str();

} // source

@end