mirror of
https://github.com/Ranchero-Software/NetNewsWire.git
synced 2024-12-18 12:28:37 +01:00
147 lines
3.8 KiB
Objective-C
147 lines
3.8 KiB
Objective-C
//
|
||
// NSData+RSParser.m
|
||
// RSParser
|
||
//
|
||
// Created by Brent Simmons on 6/24/17.
|
||
// Copyright © 2017 Ranchero Software, LLC. All rights reserved.
|
||
//
|
||
|
||
#import <RSParser/NSData+RSParser.h>
|
||
|
||
/* TODO: find real-world cases where the isProbably* cases fail when they should succeed, and add them to tests.*/
|
||
|
||
static BOOL bytesAreProbablyHTML(const char *bytes, NSUInteger numberOfBytes);
|
||
static BOOL bytesAreProbablyXML(const char *bytes, NSUInteger numberOfBytes);
|
||
static BOOL bytesStartWithStringIgnoringWhitespace(const char *string, const char *bytes, NSUInteger numberOfBytes);
|
||
static BOOL didFindString(const char *string, const char *bytes, NSUInteger numberOfBytes);
|
||
static BOOL bytesStartWithRSS(const char *bytes, NSUInteger numberOfBytes);
|
||
|
||
@implementation NSData (RSParser)
|
||
|
||
- (BOOL)isProbablyHTML {
|
||
|
||
return bytesAreProbablyHTML(self.bytes, self.length);
|
||
}
|
||
|
||
- (BOOL)isProbablyXML {
|
||
|
||
return bytesAreProbablyXML(self.bytes, self.length);
|
||
}
|
||
|
||
- (BOOL)isProbablyJSON {
|
||
|
||
return bytesStartWithStringIgnoringWhitespace("{", self.bytes, self.length);
|
||
}
|
||
|
||
- (BOOL)isProbablyJSONFeed {
|
||
|
||
if (![self isProbablyJSON]) {
|
||
return NO;
|
||
}
|
||
return didFindString("://jsonfeed.org/version/", self.bytes, self.length);
|
||
}
|
||
|
||
- (BOOL)isProbablyRSSInJSON {
|
||
|
||
if (![self isProbablyJSON]) {
|
||
return NO;
|
||
}
|
||
const char *bytes = self.bytes;
|
||
NSUInteger length = self.length;
|
||
return didFindString("rss", bytes, length) && didFindString("channel", bytes, length) && didFindString("item", bytes, length);
|
||
}
|
||
|
||
- (BOOL)isProbablyRSS {
|
||
|
||
if (bytesStartWithRSS(self.bytes, self.length)) { // Macworld’s RSS feed does not start with xml header.
|
||
return YES;
|
||
}
|
||
if (![self isProbablyXML]) {
|
||
return NO;
|
||
}
|
||
|
||
if (didFindString("<rss", self.bytes, self.length) || didFindString("<rdf:RDF", self.bytes, self.length)) {
|
||
return YES;
|
||
}
|
||
|
||
// At this writing (7 Dec. 2017), https://www.natashatherobot.com/feed/ is missing an opening <rss> tag, but it should be parsed anyway. It does have some other distinct RSS markers we can find.
|
||
return (didFindString("<channel>", self.bytes, self.length) && didFindString("<pubDate>", self.bytes, self.length));
|
||
}
|
||
|
||
- (BOOL)isProbablyAtom {
|
||
|
||
if (![self isProbablyXML]) {
|
||
return NO;
|
||
}
|
||
|
||
return didFindString("<feed", self.bytes, self.length);
|
||
}
|
||
|
||
@end
|
||
|
||
|
||
static BOOL didFindString(const char *string, const char *bytes, NSUInteger numberOfBytes) {
|
||
|
||
char *foundString = strnstr(bytes, string, numberOfBytes);
|
||
return foundString != NULL;
|
||
}
|
||
|
||
static BOOL bytesStartWithStringIgnoringWhitespace(const char *string, const char *bytes, NSUInteger numberOfBytes) {
|
||
|
||
NSUInteger i = 0;
|
||
for (i = 0; i < numberOfBytes; i++) {
|
||
|
||
const char ch = bytes[i];
|
||
if (ch == ' ' || ch == '\r' || ch == '\n' || ch == '\t') {
|
||
continue;
|
||
}
|
||
|
||
if (ch == string[0]) {
|
||
return strnstr(bytes, string, numberOfBytes) == bytes + i;
|
||
}
|
||
break;
|
||
}
|
||
return NO;
|
||
}
|
||
|
||
static BOOL bytesAreProbablyHTML(const char *bytes, NSUInteger numberOfBytes) {
|
||
|
||
if (didFindString("<html", bytes, numberOfBytes)) {
|
||
return YES;
|
||
}
|
||
if (didFindString("<HTML", bytes, numberOfBytes)) {
|
||
return YES;
|
||
}
|
||
|
||
if (didFindString("<body", bytes, numberOfBytes)) {
|
||
return YES;
|
||
}
|
||
if (didFindString("<meta", bytes, numberOfBytes)) {
|
||
return YES;
|
||
}
|
||
|
||
if (didFindString("<", bytes, numberOfBytes)) {
|
||
if (didFindString("doctype html", bytes, numberOfBytes)) {
|
||
return YES;
|
||
}
|
||
if (didFindString("DOCTYPE html", bytes, numberOfBytes)) {
|
||
return YES;
|
||
}
|
||
if (didFindString("DOCTYPE HTML", bytes, numberOfBytes)) {
|
||
return YES;
|
||
}
|
||
}
|
||
|
||
return NO;
|
||
}
|
||
|
||
static BOOL bytesAreProbablyXML(const char *bytes, NSUInteger numberOfBytes) {
|
||
|
||
return bytesStartWithStringIgnoringWhitespace("<?xml", bytes, numberOfBytes);
|
||
}
|
||
|
||
static BOOL bytesStartWithRSS(const char *bytes, NSUInteger numberOfBytes) {
|
||
|
||
return bytesStartWithStringIgnoringWhitespace("<rss", bytes, numberOfBytes);
|
||
}
|