cog/Playlist/XmlContainer.m

//
//  XmlContainer.m
//  Xml
//
//  Created by Christopher Snowhill on 10/9/13.
//  Copyright 2013 __NoWork, Inc__. All rights reserved.
//

#import "XmlContainer.h"

#import "Logging.h"

@implementation XmlContainer

+ (NSURL *)urlForPath:(NSString *)path relativeTo:(NSString *)baseFilename {
	NSRange protocolRange = [path rangeOfString:@"://"];
	if(protocolRange.location != NSNotFound) {
		return [NSURL URLWithString:path];
	}

	NSMutableString *unixPath = [path mutableCopy];

	// Get the fragment
	NSString *fragment = @"";
	NSScanner *scanner = [NSScanner scannerWithString:unixPath];
	NSCharacterSet *characterSet = [NSCharacterSet characterSetWithCharactersInString:@"#1234567890"];
	while(![scanner isAtEnd]) {
		NSString *possibleFragment;
		[scanner scanUpToString:@"#" intoString:nil];

		if([scanner scanCharactersFromSet:characterSet intoString:&possibleFragment] && [scanner isAtEnd]) {
			fragment = possibleFragment;
			[unixPath deleteCharactersInRange:NSMakeRange([scanner scanLocation] - [possibleFragment length], [possibleFragment length])];
			break;
		}
	}
	DLog(@"Fragment: %@", fragment);

	if(![unixPath hasPrefix:@"/"]) {
		// Only relative paths would have windows backslashes.
		[unixPath replaceOccurrencesOfString:@"\\" withString:@"/" options:0 range:NSMakeRange(0, [unixPath length])];

		NSString *basePath = [[[baseFilename stringByStandardizingPath] stringByDeletingLastPathComponent] stringByAppendingString:@"/"];

		[unixPath insertString:basePath atIndex:0];
	}

	// Append the fragment
	NSURL *url = [NSURL URLWithString:[[[NSURL fileURLWithPath:unixPath] absoluteString] stringByAppendingString:fragment]];
	return url;
}

+ (NSDictionary *)entriesForContainerURL:(NSURL *)url {
	if(![url isFileURL])
		return nil;

	NSError *error;

	NSString *filename = [url path];

	NSString *contents = [NSString stringWithContentsOfFile:filename
	                                               encoding:NSUTF8StringEncoding
	                                                  error:&error];
	if(!contents) {
		ALog(@"Error: %@", error);
		return nil;
	}

	NSData *plistData = [contents dataUsingEncoding:NSUTF8StringEncoding];

	NSPropertyListFormat format;
	id plist = [NSPropertyListSerialization propertyListWithData:plistData
	                                                     options:NSPropertyListImmutable
	                                                      format:&format
	                                                       error:&error];
	if(!plist) {
		ALog(@"Error: %@", error);
		return nil;
	}

	BOOL isArray = [plist isKindOfClass:[NSArray class]];
	BOOL isDict = [plist isKindOfClass:[NSDictionary class]];

	if(!isDict && !isArray) return nil;

	NSArray *items;
	NSDictionary *albumArt;
	NSArray *queueList;
	if(isArray) {
		items = (NSArray *)plist;
		albumArt = nil;
		queueList = @[];
	} else {
		NSDictionary *dict = (NSDictionary *)plist;
		items = dict[@"items"];
		albumArt = dict[@"albumArt"];
		queueList = dict[@"queue"];
		if(!queueList) queueList = @[];
	}

	NSMutableArray *entries = [NSMutableArray array];

	for(NSDictionary *entry in items) {
		NSMutableDictionary *preparedEntry = [NSMutableDictionary dictionaryWithDictionary:entry];

		preparedEntry[@"URL"] = [self urlForPath:preparedEntry[@"URL"] relativeTo:filename];

		if(albumArt && preparedEntry[@"albumArt"])
			preparedEntry[@"albumArt"] = albumArt[preparedEntry[@"albumArt"]];

		[entries addObject:[NSDictionary dictionaryWithDictionary:preparedEntry]];
	}

	return @{ @"entries": entries, @"queue": queueList };
}

@end