shrughes fucked around with this message at 05:20 on Apr 13, 2009

shrughes fucked around with this message at 21:31 on Apr 17, 2010

static enum ParseState consume(NSMutableData *output, const char **posRef, const char *end, enum
 ParseState state, NSString **lastSeenThreadId) {
	const char *pos = *posRef;
	const char *r = pos;
more:
	switch (state) {
		case ParseStateTop: {
			const char *linkBeg = skipThroughSegment(&r, end,
 "<link rel=\"stylesheet\"" "type=\"text/css\" href=\"http://ycombinator.com/news.css\">");
			if (!linkBeg) {
				break;
			}
			state = ParseStateBeforeScript;
			[output appendBytes:pos length:linkBeg - pos];
			static const char alternateLink[] = "<link rel=\"stylesheet\" type=\"text/"
"css\" href=\"hn://ycombinator.com/news.css\">";
			[output appendBytes:alternateLink length:strlen(alternateLink)];
			pos = r;
			NSLog(@"Modified stylesheet!");
		}
			// fallthru
		case ParseStateBeforeScript: {
			if (!skipThroughString(&r, end, "var item = v[1];")) {
				break;
			}
			state = ParseStateBeforeMainTable;
			[output appendBytes:pos length:r - pos];
			pos = r;
			static const char confirmation[] = "if (!confirm('Sure you want to vote '"
" + v[0] + '?')) { return false; }";
			[output appendBytes:confirmation length:strlen(confirmation)];
		}
			// fallthru
		case ParseStateBeforeMainTable: {
			const char *attrBeg = NULL;
			const char *attrEnd = NULL;
			const char *segBeg = skipThroughTagWithAttr(&r, end, "table",
 "width=\"85%\"", &attrBeg, &attrEnd);
			if (!segBeg) {
				break;
			}
			state = ParseStateBeforePageTop;
			[output appendBytes:pos length:attrBeg - pos];
			static const char fullWidth[] = kFullTableWidth;
			[output appendBytes:fullWidth length:strlen(fullWidth)];
			[output appendBytes:attrEnd length:r-attrEnd];
			pos = r;
			NSLog(@"Full width!");
		}
			// fallthru
		case ParseStateBeforePageTop: {
			BOOL through = NULL != skipThroughSegment(&r, end,
 "<span class=\"pagetop\">");
			if (!through) {
				break;
			}
			state = ParseStateAfterPageTop;
			NSLog(@"Pierced through pagetop!");
		}
			// fallthru
		case ParseStateAfterPageTop: {
			BOOL through = NULL != skipThroughCloser(&r, end, "table");
			if (!through) {
				break;
			}
			state = ParseStateAfterTopRow;
			NSLog(@"Pierced through top row!");
		}
			// fallthru
		case ParseStateAfterTopRow: {
			BOOL through = NULL != skipThroughOpeningTag(&r, end, "table");
			if (!through) {
				break;
			}
			state = ParseStateInContentTable;
			NSLog(@"In content table!");
		}
			// fallthru
		case ParseStateInContentTable: {
			const char *attrBeg;
			const char *attrEnd;
			BOOL isDefault;
			const char *opener = choiceTagWithAttr(&r, end, "td", "class=\"default\"",
 "class=\"title\"", &attrBeg, &attrEnd, &isDefault);
			if (!opener) {
				break;
			}
			if (isDefault) {
				const char *tdDefault = opener;
				const char *commentWalker = r;
				r = tdDefault;
				const char *tdDefaultClassInsertionPoint = attrEnd - 1;
				const char *spanComhead = skipThroughTagWithAttr(&commentWalker,
 end, "span", "class=\"comhead\"", &attrBeg, &attrEnd);
				if (!spanComhead) {
					break;
				}
				if (!skipThroughTagWithAttr(&commentWalker, end, "span",
 "id=score_", &attrBeg, &attrEnd)) {
					break;
				}
				const char *beginningOfCommentId = attrEnd;
				const char *endOfCommentId = eatToChar(beginningOfCommentId,
 end, '>');
				if (!skipThroughTagWithAttr(&commentWalker, end, "span",
 "class=\"comment\"", &attrBeg, &attrEnd)) {
					break;
				}
	//			const char *beginningOfComment = commentWalker;
				const char *endOfComment = skipThroughCloser(&commentWalker,
 end, "span");
				// If we haven't read the whole comment, move r before 
// the recognizable td class="default".
				if (endOfComment == NULL) {
					break;
				}
				NSString *itemId = [NSString stringWithCString:beginningOfCommentId
 length:endOfCommentId - beginningOfCommentId];
				NSString *threadId = *lastSeenThreadId;
				enum PostTrackerPostNovelty novelty = threadId ? [[PostTracker
 thePostTracker] noticePost:itemId inThread:threadId] : PostTrackerPostNoveltyNotNew;

				// alright.  let's write.
				// Write data up to td class="default":
				[output appendBytes:pos length:tdDefaultClassInsertionPoint - pos];
				// Adjust td class:
				const char *extraClass = novelty == PostTrackerPostNoveltyNew ?
 " noveltyNew" : "";
				[output appendBytes:extraClass length:strlen(extraClass)];
				// write everything else consumed:
				[output appendBytes:tdDefaultClassInsertionPoint length:
commentWalker - tdDefaultClassInsertionPoint];
				pos = commentWalker;
				r = pos;
			} else {
				const char *tdTitle = opener;
				const char *titleWalker = r;
				r = tdTitle;
				if (!skipThroughTagWithAttr(&titleWalker, end, "span",
 "id=score_", &attrBeg, &attrEnd)) {
					break;
				}
				const char *beginningOfThreadId = attrEnd;
				const char *endOfThreadId = eatToChar(beginningOfThreadId,
 end, '>');
				if (!skipThroughTagWithAttr(&titleWalker, end, "a",
 "href=\"item?id=", &attrBeg, &attrEnd)) {
					break;
				}
				const char *beginningOfCommentCount = titleWalker;
				const char *endOfCommentCount = eatToOneOf(beginningOfCommentCount,
 end, " <");
				titleWalker = eatToChar(titleWalker, end, '<');
				if (!titleWalker) {
					break;
				}
				// Now, how many comments do we have, and what's our thread id?
				NSString *commentCountString = [NSString 
stringWithCString:beginningOfCommentCount length:endOfCommentCount - beginningOfCommentCount];
				NSInteger commentCount = [commentCountString integerValue];
				NSString *threadId = [NSString stringWithCString:
beginningOfThreadId length:endOfThreadId - beginningOfThreadId];
				NSLog(@"Comment count string: %@ thread id string: %@", 
commentCountString, threadId);
				NSInteger knownComments = [[PostTracker thePostTracker] 
knownCommentsForThread:threadId];
				// now for some output...
				[output appendBytes:pos length:titleWalker - pos];
				if (commentCount > knownComments) {
					NSString *s = [NSString stringWithFormat:@" <b>(%d)</b>", 
(commentCount - knownComments)];
					[output appendData:
[s dataUsingEncoding:NSASCIIStringEncoding]];
				}
				pos = titleWalker;
				r = pos;
				*lastSeenThreadId = [threadId retain];
			}
		}
			goto more;
		default:
			r = end;
			break;
	}
	[output appendBytes:pos length:r - pos];
	*posRef = r;
	return state;
}

shrughes fucked around with this message at 05:42 on Apr 20, 2010