PGWebKitAdditions.m

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#import "PGWebKitAdditions.h"

// Models
#import "PGResourceIdentifier.h"
#import "PGDataProvider.h"

// Other Sources
#import "PGFoundationAdditions.h"

@implementation DOMHTMLDocument(PGWebKitAdditions)

- (NSArray *)PG_providersForLinksWithMIMETypes:(NSArray *)MIMETypes
{
	NSMutableArray *const results = [NSMutableArray array];
	NSMutableArray *const hrefs = [NSMutableArray array];
	DOMNodeList *const links = [self getElementsByTagName:@"LINK"];
	NSUInteger i = 0;
	for(; i < [links length]; i++) {
		DOMHTMLLinkElement *const link = (DOMHTMLLinkElement *)[links item:i];
		if(![[[link rel] componentsSeparatedByString:@" "] containsObject:@"alternate"]) continue;
		if(MIMETypes && ![MIMETypes containsObject:[link type]]) continue;
		NSString *const href = [link href];
		if([hrefs containsObject:href]) continue;
		[hrefs addObject:href];
		[results addObject:[PGDataProvider providerWithResourceIdentifier:[[NSURL URLWithString:href] PG_resourceIdentifier] displayableName:[link title]]];
	}
	return results;
}
- (NSArray *)PG_providersForAnchorsWithSchemes:(NSArray *)schemes
{
	NSMutableArray *const results = [NSMutableArray array];
	NSMutableArray *const hrefs = [NSMutableArray array];
	DOMHTMLCollection *const anchors = [self links];
	NSUInteger i = 0;
	NSUInteger const count = [anchors length];
	for(; i < count; i++) {
		DOMHTMLAnchorElement *const anchor = (DOMHTMLAnchorElement *)[anchors item:i];
		NSString *href = [anchor href];
		NSUInteger anchorStart = [href rangeOfString:@"#" options:NSBackwardsSearch].location;
		if(NSNotFound != anchorStart) href = [href substringToIndex:anchorStart];
		if(![href length]) continue;
		if([hrefs containsObject:href]) continue;
		[hrefs addObject:href];

		NSURL *const URL = [NSURL URLWithString:href];
		if(schemes && ![schemes containsObject:[[URL scheme] lowercaseString]]) continue;
		[results addObject:[PGDataProvider providerWithResourceIdentifier:[URL PG_resourceIdentifier] displayableName:[[anchor innerText] stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]]]];
	}
	return results;
}
- (NSArray *)PG_providersForImages
{
	NSMutableArray *const results = [NSMutableArray array];
	NSMutableArray *const srcs = [NSMutableArray array];
	DOMHTMLCollection *const images = [self images];
	NSUInteger i = 0;
	NSUInteger const count = [images length];
	for(; i < count; i++) {
		DOMHTMLImageElement *const img = (DOMHTMLImageElement *)[images item:i];
		if([img PG_hasAncestorWithNodeName:@"A"]) continue; // I have a hypothesis that images within links are rarely interesting in and of themselves, so don't load them.
		NSString *const src = [img src];
		if([srcs containsObject:src]) continue;
		[srcs addObject:src];
		NSString *const title = [img title]; // Prefer the title to the alt attribute.
		[results addObject:[PGDataProvider providerWithResourceIdentifier:[[NSURL URLWithString:[img src]] PG_resourceIdentifier] displayableName:[title length] ? title : [img alt]]];
	}
	return results;
}

@end

@implementation DOMNode(PGWebKitAdditions)

- (BOOL)PG_hasAncestorWithNodeName:(NSString *)string
{
	return PGEqualObjects([self nodeName], string) ? YES : [[self parentNode] PG_hasAncestorWithNodeName:string];
}

@end