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NewsBlur/clients/ios/Other Sources/Overshare Kit/OSKTwitterText.m

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Adding OvershareKit.
2014-01-06 17:55:14 -08:00
//
// OSKTwitterText.m
//
// Copyright 2012 Twitter, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
#import "OSKTwitterText.h"
//
// These regular expressions are ported from twitter-text-rb on Apr 24 2012.
//
#define TWUControlCharacters @"\\u0009-\\u000D"
#define TWUSpace @"\\u0020"
#define TWUControl85 @"\\u0085"
#define TWUNoBreakSpace @"\\u00A0"
#define TWUOghamBreakSpace @"\\u1680"
#define TWUMongolianVowelSeparator @"\\u180E"
#define TWUWhiteSpaces @"\\u2000-\\u200A"
#define TWULineSeparator @"\\u2028"
#define TWUParagraphSeparator @"\\u2029"
#define TWUNarrowNoBreakSpace @"\\u202F"
#define TWUMediumMathematicalSpace @"\\u205F"
#define TWUIdeographicSpace @"\\u3000"
#define TWUUnicodeSpaces \
TWUControlCharacters \
TWUSpace \
TWUControl85 \
TWUNoBreakSpace \
TWUOghamBreakSpace \
TWUMongolianVowelSeparator \
TWUWhiteSpaces \
TWULineSeparator \
TWUParagraphSeparator \
TWUNarrowNoBreakSpace \
TWUMediumMathematicalSpace \
TWUIdeographicSpace
#define TWUInvalidCharacters @"\\uFFFE\\uFEFF\\uFFFF\\u202A-\\u202E"
#define TWULatinAccents \
@"\\u00C0-\\u00D6\\u00D8-\\u00F6\\u00F8-\\u00FF\\u0100-\\u024F\\u0253-\\u0254\\u0256-\\u0257\\u0259\\u025b\\u0263\\u0268\\u026F\\u0272\\u0289\\u02BB\\u1E00-\\u1EFF"
//
// Hashtag
//
#define TWUCyrillicHashtagChars @"\\u0400-\\u04FF"
#define TWUCyrillicSupplementHashtagChars @"\\u0500-\\u0527"
#define TWUCyrillicExtendedAHashtagChars @"\\u2DE0-\\u2DFF"
#define TWUCyrillicExtendedBHashtagChars @"\\uA640-\\uA69F"
#define TWUHebrewHashtagChars @"\\u0591-\\u05BF\\u05C1-\\u05C2\\u05C4-\\u05C5\\u05C7\\u05D0-\\u05EA\\u05F0-\\u05F4"
#define TWUHebrewPresentationFormsHashtagChars @"\\uFB12-\\uFB28\\uFB2A-\\uFB36\\uFB38-\\uFB3C\\uFB3E\\uFB40-\\uFB41\\uFB43-\\uFB44\\uFB46-\\uFB4F"
#define TWUArabicHashtagChars @"\\u0610-\\u061A\\u0620-\\u065F\\u066E-\\u06D3\\u06D5-\\u06DC\\u06DE-\\u06E8\\u06EA-\\u06EF\\u06FA-\\u06FC\\u06FF"
#define TWUArabicSupplementHashtagChars @"\\u0750-\\u077F"
#define TWUArabicExtendedAHashtagChars @"\\u08A0\\u08A2-\\u08AC\\u08E4-\\u08FE"
#define TWUArabicPresentationFormsAHashtagChars @"\\uFB50-\\uFBB1\\uFBD3-\\uFD3D\\uFD50-\\uFD8F\\uFD92-\\uFDC7\\uFDF0-\\uFDFB"
#define TWUArabicPresentationFormsBHashtagChars @"\\uFE70-\\uFE74\\uFE76-\\uFEFC"
#define TWUZeroWidthNonJoiner @"\\u200C"
#define TWUThaiHashtagChars @"\\u0E01-\\u0E3A"
#define TWUHangulHashtagChars @"\\u0E40-\\u0E4E"
#define TWUHangulJamoHashtagChars @"\\u1100-\\u11FF"
#define TWUHangulCompatibilityJamoHashtagChars @"\\u3130-\\u3185"
#define TWUHangulJamoExtendedAHashtagChars @"\\uA960-\\uA97F"
#define TWUHangulSyllablesHashtagChars @"\\uAC00-\\uD7AF"
#define TWUHangulJamoExtendedBHashtagChars @"\\uD7B0-\\uD7FF"
#define TWUHalfWidthHangulHashtagChars @"\\uFFA1-\\uFFDC"
#define TWUNonLatinHashtagChars \
TWUCyrillicHashtagChars \
TWUCyrillicSupplementHashtagChars \
TWUCyrillicExtendedAHashtagChars \
TWUCyrillicExtendedBHashtagChars \
TWUHebrewHashtagChars \
TWUHebrewPresentationFormsHashtagChars \
TWUArabicHashtagChars \
TWUArabicSupplementHashtagChars \
TWUArabicExtendedAHashtagChars \
TWUArabicPresentationFormsAHashtagChars \
TWUArabicPresentationFormsBHashtagChars \
TWUZeroWidthNonJoiner \
TWUThaiHashtagChars \
TWUHangulHashtagChars \
TWUHangulJamoHashtagChars \
TWUHangulCompatibilityJamoHashtagChars \
TWUHangulJamoExtendedAHashtagChars \
TWUHangulSyllablesHashtagChars \
TWUHangulJamoExtendedBHashtagChars \
TWUHalfWidthHangulHashtagChars
#define TWUKatakanaHashtagChars @"\\u30A1-\\u30FA\\u30FC-\\u30FE"
#define TWUKatakanaHalfWidthHashtagChars @"\\uFF66-\\uFF9F"
#define TWULatinFullWidthHashtagChars @"\\uFF10-\\uFF19\\uFF21-\\uFF3A\\uFF41-\\uFF5A"
#define TWUHiraganaHashtagChars @"\\u3041-\\u3096\\u3099-\\u309E"
#define TWUCJKExtensionAHashtagChars @"\\u3400-\\u4DBF"
#define TWUCJKUnifiedHashtagChars @"\\u4E00-\\u9FFF"
#define TWUCJKExtensionBHashtagChars @"\\U00020000-\\U0002A6DF"
#define TWUCJKExtensionCHashtagChars @"\\U0002A700-\\U0002B73F"
#define TWUCJKExtensionDHashtagChars @"\\U0002B740-\\U0002B81F"
#define TWUCJKSupplementHashtagChars @"\\U0002F800-\\U0002FA1F\\u3003\\u3005\\u303B"
#define TWUCJKHashtagCharacters \
TWUKatakanaHashtagChars \
TWUKatakanaHalfWidthHashtagChars \
TWULatinFullWidthHashtagChars \
TWUHiraganaHashtagChars \
TWUCJKExtensionAHashtagChars \
TWUCJKUnifiedHashtagChars \
TWUCJKExtensionBHashtagChars \
TWUCJKExtensionCHashtagChars \
TWUCJKExtensionDHashtagChars \
TWUCJKSupplementHashtagChars
#define TWUPunctuationChars @"\\-_!\"#$%&'()*+,./:;<=>?@\\[\\]^`{|}~"
#define TWUPunctuationCharsWithoutHyphen @"_!\"#$%&'()*+,./:;<=>?@\\[\\]^`{|}~"
#define TWUPunctuationCharsWithoutHyphenAndUnderscore @"!\"#$%&'()*+,./:;<=>?@\\[\\]^`{|}~"
#define TWUCtrlChars @"\\x00-\\x1F\\x7F"
#define TWHashtagAlpha \
@"[a-z_" \
TWULatinAccents \
TWUNonLatinHashtagChars \
TWUCJKHashtagCharacters \
@"]"
#define TWUHashtagAlphanumeric \
@"[a-z0-9_" \
TWULatinAccents \
TWUNonLatinHashtagChars \
TWUCJKHashtagCharacters \
@"]"
#define TWUHashtagBoundary \
@"^|$|[^&a-z0-9_" \
TWULatinAccents \
TWUNonLatinHashtagChars \
TWUCJKHashtagCharacters \
@"]"
#define TWUValidHashtag \
@"(?:" TWUHashtagBoundary @")([#＃]" TWUHashtagAlphanumeric @"*" TWHashtagAlpha TWUHashtagAlphanumeric @"*)"
#define TWUEndHashTagMatch @"\\A(?:[#＃]|://)"
//
// Cashtag
//
#define TWUCashtag @"[a-z]{1,6}(?:[._][a-z]{1,2})?"
#define TWUValidCashtag \
@"(?:^|[" TWUUnicodeSpaces @"])" \
@"(\\$" TWUCashtag @")" \
@"(?=$|\\s|[" TWUPunctuationChars @"])"
//
// Mention and list name
//
#define TWUValidMentionPrecedingChars @"(?:[^a-zA-Z0-9_!#$%&*@＠]|^|RT:?)"
#define TWUAtSigns @"[@＠]"
#define TWUValidUsername @"\\A" TWUAtSigns @"[a-zA-Z0-9_]{1,20}\\z"
#define TWUValidList @"\\A" TWUAtSigns @"[a-zA-Z0-9_]{1,20}/[a-zA-Z][a-zA-Z0-9_\\-]{0,24}\\z"
#define TWUValidMentionOrList \
@"(" TWUValidMentionPrecedingChars @")" \
@"(" TWUAtSigns @")" \
@"([a-zA-Z0-9_]{1,20})" \
@"(/[a-zA-Z][a-zA-Z0-9_\\-]{0,24})?"
#define TWUValidReply @"\\A(?:[" TWUUnicodeSpaces @"])*" TWUAtSigns @"([a-zA-Z0-9_]{1,20})"
#define TWUEndMentionMatch @"\\A(?:" TWUAtSigns @"|[" TWULatinAccents @"]|://)"
//
// URL
//
#define TWUValidURLPrecedingChars @"(?:[^a-zA-Z0-9@＠$#＃" TWUInvalidCharacters @"]|^)"
#define TWUDomainValidStartEndChars \
@"[^" \
TWUPunctuationChars \
TWUCtrlChars \
TWUInvalidCharacters \
TWUUnicodeSpaces \
@"]"
#define TWUSubdomainValidMiddleChars \
@"[^" \
TWUPunctuationCharsWithoutHyphenAndUnderscore \
TWUCtrlChars \
TWUInvalidCharacters \
TWUUnicodeSpaces \
@"]"
#define TWUDomainValidMiddleChars \
@"[^" \
TWUPunctuationCharsWithoutHyphen \
TWUCtrlChars \
TWUInvalidCharacters \
TWUUnicodeSpaces \
@"]"
#define TWUValidSubdomain \
@"(?:" \
@"(?:" TWUDomainValidStartEndChars TWUSubdomainValidMiddleChars @"*)?" TWUDomainValidStartEndChars @"\\." \
@")"
#define TWUValidDomainName \
@"(?:" \
@"(?:" TWUDomainValidStartEndChars TWUDomainValidMiddleChars @"*)?" TWUDomainValidStartEndChars @"\\." \
@")"
#define TWUValidGTLD @"(?:(?:aero|asia|biz|cat|com|coop|edu|gov|info|int|jobs|mil|mobi|museum|name|net|org|pro|tel|travel|xxx)(?=[^0-9a-z]|$))"
#define TWUValidCCTLD \
@"(?:" \
@"(?:" \
@"ac|ad|ae|af|ag|ai|al|am|an|ao|aq|ar|as|at|au|aw|ax|az|ba|bb|bd|be|bf|bg|bh|" \
@"bi|bj|bm|bn|bo|br|bs|bt|bv|bw|by|bz|ca|cc|cd|cf|cg|ch|ci|ck|cl|cm|cn|co|cr|" \
@"cs|cu|cv|cx|cy|cz|dd|de|dj|dk|dm|do|dz|ec|ee|eg|eh|er|es|et|eu|fi|fj|fk|fm|" \
@"fo|fr|ga|gb|gd|ge|gf|gg|gh|gi|gl|gm|gn|gp|gq|gr|gs|gt|gu|gw|gy|hk|hm|hn|hr|" \
@"ht|hu|id|ie|il|im|in|io|iq|ir|is|it|je|jm|jo|jp|ke|kg|kh|ki|km|kn|kp|kr|kw|" \
@"ky|kz|la|lb|lc|li|lk|lr|ls|lt|lu|lv|ly|ma|mc|md|me|mg|mh|mk|ml|mm|mn|mo|mp|" \
@"mq|mr|ms|mt|mu|mv|mw|mx|my|mz|na|nc|ne|nf|ng|ni|nl|no|np|nr|nu|nz|om|pa|pe|" \
@"pf|pg|ph|pk|pl|pm|pn|pr|ps|pt|pw|py|qa|re|ro|rs|ru|rw|sa|sb|sc|sd|se|sg|sh|" \
@"si|sj|sk|sl|sm|sn|so|sr|ss|st|su|sv|sy|sz|tc|td|tf|tg|th|tj|tk|tl|tm|tn|to|" \
@"tp|tr|tt|tv|tw|tz|ua|ug|uk|us|uy|uz|va|vc|ve|vg|vi|vn|vu|wf|ws|ye|yt|za|zm|" \
@"zw" \
@")" \
@"(?=[^0-9a-z]|$)" \
@")"
#define TWUValidPunycode @"(?:xn--[0-9a-z]+)"
#define TWUValidDomain \
@"(?:" \
TWUValidSubdomain @"*" TWUValidDomainName \
@"(?:" TWUValidGTLD @"|" TWUValidCCTLD @"|" TWUValidPunycode @")" \
@")"
#define TWUValidASCIIDomain \
@"(?:[a-zA-Z0-9\\-_" TWULatinAccents @"]+\\.)+" \
@"(?:" TWUValidGTLD @"|" TWUValidCCTLD @"|" TWUValidPunycode @")" \
#define TWUValidTCOURL @"https?://t\\.co/[a-zA-Z0-9]+"
#define TWUInvalidShortDomain @"\\A" TWUValidDomainName TWUValidCCTLD @"\\z"
#define TWUValidPortNumber @"[0-9]+"
#define TWUValidGeneralURLPathChars @"[a-zA-Z0-9!\\*';:=+,.$/%#\\[\\]\\-_~&|@" TWULatinAccents @"]"
#define TWUValidURLBalancedParens @"\\(" TWUValidGeneralURLPathChars @"+\\)"
#define TWUValidURLPathEndingChars @"[a-zA-Z0-9=_#/+\\-" TWULatinAccents @"]|(?:" TWUValidURLBalancedParens @")"
#define TWUValidURLPath \
@"(?:" \
@"(?:" \
TWUValidGeneralURLPathChars @"*" \
@"(?:" TWUValidURLBalancedParens TWUValidGeneralURLPathChars @"*)*" TWUValidURLPathEndingChars \
@")" \
@"|" \
@"(?:" TWUValidGeneralURLPathChars @"+/)" \
@")"
#define TWUValidURLQueryChars @"[a-zA-Z0-9!?*'\\(\\);:&=+$/%#\\[\\]\\-_\\.,~|@]"
#define TWUValidURLQueryEndingChars @"[a-zA-Z0-9_&=#/]"
#define TWUValidURL \
@"(" \
@"(" TWUValidURLPrecedingChars @")" \
@"(" \
@"(https?://)?" \
@"(" TWUValidDomain @")" \
@"(?::(" TWUValidPortNumber @"))?" \
@"(/" TWUValidURLPath @"*)?" \
@"(\\?" TWUValidURLQueryChars @"*" TWUValidURLQueryEndingChars @")?" \
@")" \
@")"
static const NSInteger MaxTweetLength = 140;
static const NSInteger HTTPShortURLLength = 22;
static const NSInteger HTTPSShortURLLength = 23;
@implementation OSKTwitterText
+ (NSArray*)entitiesInText:(NSString*)text
{
if (!text.length) {
return [NSArray array];
}
NSMutableArray *results = [NSMutableArray array];
NSArray *urls = [self URLsInText:text];
[results addObjectsFromArray:urls];
NSArray *hashtags = [self hashtagsInText:text withURLEntities:urls];
[results addObjectsFromArray:hashtags];
NSArray *cashtags = [self symbolsInText:text withURLEntities:urls];
[results addObjectsFromArray:cashtags];
NSArray *mentionsAndLists = [self mentionsOrListsInText:text];
NSMutableArray *addingItems = [NSMutableArray array];
for (OSKTwitterTextEntity *entity in mentionsAndLists) {
NSRange entityRange = entity.range;
BOOL found = NO;
for (OSKTwitterTextEntity *existingEntity in results) {
if (NSIntersectionRange(existingEntity.range, entityRange).length > 0) {
found = YES;
break;
}
}
if (!found) {
[addingItems addObject:entity];
}
}
[results addObjectsFromArray:addingItems];
[results sortUsingSelector:@selector(compare:)];
return results;
}
+ (NSArray*)URLsInText:(NSString*)text
{
if (!text.length) {
return [NSArray array];
}
NSMutableArray *results = [NSMutableArray array];
NSInteger len = text.length;
NSInteger position = 0;
NSRange allRange = NSMakeRange(0, 0);
while (1) {
position = NSMaxRange(allRange);
NSTextCheckingResult *urlResult = [[self validURLRegexp] firstMatchInString:text options:NSMatchingWithoutAnchoringBounds range:NSMakeRange(position, len - position)];
if (!urlResult || urlResult.numberOfRanges < 9) {
break;
}
allRange = urlResult.range;
NSRange precedingRange = [urlResult rangeAtIndex:2];
NSRange urlRange = [urlResult rangeAtIndex:3];
NSRange protocolRange = [urlResult rangeAtIndex:4];
NSRange domainRange = [urlResult rangeAtIndex:5];
// If protocol is missing and domain contains non-ASCII characters,
// extract ASCII-only domains.
if (protocolRange.location == NSNotFound) {
if (precedingRange.location != NSNotFound && precedingRange.length > 0) {
NSString *preceding = [text substringWithRange:precedingRange];
NSRange suffixRange = [preceding rangeOfCharacterFromSet:[self invalidURLWithoutProtocolPrecedingCharSet] options:NSBackwardsSearch | NSAnchoredSearch];
if (suffixRange.location != NSNotFound) {
continue;
}
}
NSInteger domainStart = domainRange.location;
NSInteger domainEnd = NSMaxRange(domainRange);
OSKTwitterTextEntity *lastEntity = nil;
BOOL lastInvalidShortResult = NO;
while (domainStart < domainEnd) {
NSTextCheckingResult *asciiResult = [[self validASCIIDomainRegexp] firstMatchInString:text options:0 range:NSMakeRange(domainStart, domainEnd - domainStart)];
if (!asciiResult) {
break;
}
urlRange = asciiResult.range;
lastEntity = [OSKTwitterTextEntity entityWithType:OSKTwitterTextEntityURL range:urlRange];
NSTextCheckingResult *invalidShortResult = [[self invalidShortDomainRegexp] firstMatchInString:text options:0 range:urlRange];
lastInvalidShortResult = (invalidShortResult != nil);
if (!lastInvalidShortResult) {
[results addObject:lastEntity];
}
domainStart = NSMaxRange(urlRange);
}
if (!lastEntity) {
continue;
}
NSRange pathRange = [urlResult rangeAtIndex:7];
if (pathRange.location != NSNotFound && NSMaxRange(lastEntity.range) == pathRange.location) {
if (lastInvalidShortResult) {
[results addObject:lastEntity];
}
NSRange entityRange = lastEntity.range;
entityRange.length += pathRange.length;
lastEntity.range = entityRange;
}
} else {
// In the case of t.co URLs, don't allow additional path characters
NSRange tcoRange = [[self validTCOURLRegexp] rangeOfFirstMatchInString:text options:0 range:urlRange];
if (tcoRange.location != NSNotFound) {
urlRange.length = tcoRange.length;
}
OSKTwitterTextEntity *entity = [OSKTwitterTextEntity entityWithType:OSKTwitterTextEntityURL range:urlRange];
[results addObject:entity];
}
}
return results;
}
+ (NSArray*)hashtagsInText:(NSString*)text checkingURLOverlap:(BOOL)checkingURLOverlap
{
if (!text.length) {
return [NSArray array];
}
NSArray *urls = nil;
if (checkingURLOverlap) {
urls = [self URLsInText:text];
}
return [self hashtagsInText:text withURLEntities:urls];
}
+ (NSArray*)hashtagsInText:(NSString*)text withURLEntities:(NSArray*)urlEntities
{
if (!text.length) {
return [NSArray array];
}
NSMutableArray *results = [NSMutableArray array];
NSInteger len = text.length;
NSInteger position = 0;
while (1) {
NSTextCheckingResult *matchResult = [[self validHashtagRegexp] firstMatchInString:text options:NSMatchingWithoutAnchoringBounds range:NSMakeRange(position, len - position)];
if (!matchResult || matchResult.numberOfRanges < 2) {
break;
}
NSRange hashtagRange = [matchResult rangeAtIndex:1];
BOOL matchOk = YES;
// Check URL overlap
for (OSKTwitterTextEntity *urlEntity in urlEntities) {
if (NSIntersectionRange(urlEntity.range, hashtagRange).length > 0) {
matchOk = NO;
break;
}
}
if (matchOk) {
NSInteger afterStart = NSMaxRange(hashtagRange);
if (afterStart < len) {
NSRange endMatchRange = [[self endHashtagRegexp] rangeOfFirstMatchInString:text options:0 range:NSMakeRange(afterStart, len - afterStart)];
if (endMatchRange.location != NSNotFound) {
matchOk = NO;
}
}
if (matchOk) {
OSKTwitterTextEntity *entity = [OSKTwitterTextEntity entityWithType:OSKTwitterTextEntityHashtag range:hashtagRange];
[results addObject:entity];
}
}
position = NSMaxRange(matchResult.range);
}
return results;
}
+ (NSArray*)symbolsInText:(NSString*)text checkingURLOverlap:(BOOL)checkingURLOverlap
{
if (!text.length) {
return [NSArray array];
}
NSArray *urls = nil;
if (checkingURLOverlap) {
urls = [self URLsInText:text];
}
return [self symbolsInText:text withURLEntities:urls];
}
+ (NSArray*)symbolsInText:(NSString*)text withURLEntities:(NSArray*)urlEntities
{
if (!text.length) {
return [NSArray array];
}
NSMutableArray *results = [NSMutableArray array];
NSInteger len = text.length;
NSInteger position = 0;
while (1) {
NSTextCheckingResult *matchResult = [[self validCashtagRegexp] firstMatchInString:text options:NSMatchingWithoutAnchoringBounds range:NSMakeRange(position, len - position)];
if (!matchResult || matchResult.numberOfRanges < 2) {
break;
}
NSRange symbolRange = [matchResult rangeAtIndex:1];
BOOL matchOk = YES;
// Check URL overlap
for (OSKTwitterTextEntity *urlEntity in urlEntities) {
if (NSIntersectionRange(urlEntity.range, symbolRange).length > 0) {
matchOk = NO;
break;
}
}
if (matchOk) {
OSKTwitterTextEntity *entity = [OSKTwitterTextEntity entityWithType:OSKTwitterTextEntitySymbol range:symbolRange];
[results addObject:entity];
}
position = NSMaxRange(matchResult.range);
}
return results;
}
+ (NSArray*)mentionedScreenNamesInText:(NSString*)text
{
if (!text.length) {
return [NSArray array];
}
NSArray *mentionsOrLists = [self mentionsOrListsInText:text];
NSMutableArray *results = [NSMutableArray array];
for (OSKTwitterTextEntity *entity in mentionsOrLists) {
if (entity.type == OSKTwitterTextEntityScreenName) {
[results addObject:entity];
}
}
return results;
}
+ (NSArray*)mentionsOrListsInText:(NSString*)text
{
if (!text.length) {
return [NSArray array];
}
NSMutableArray *results = [NSMutableArray array];
NSInteger len = text.length;
NSInteger position = 0;
while (1) {
NSTextCheckingResult *matchResult = [[self validMentionOrListRegexp] firstMatchInString:text options:NSMatchingWithoutAnchoringBounds range:NSMakeRange(position, len - position)];
if (!matchResult || matchResult.numberOfRanges < 5) {
break;
}
NSRange allRange = matchResult.range;
NSInteger end = NSMaxRange(allRange);
NSRange endMentionRange = [[self endMentionRegexp] rangeOfFirstMatchInString:text options:0 range:NSMakeRange(end, len - end)];
if (endMentionRange.location == NSNotFound) {
NSRange atSignRange = [matchResult rangeAtIndex:2];
NSRange screenNameRange = [matchResult rangeAtIndex:3];
NSRange listNameRange = [matchResult rangeAtIndex:4];
if (listNameRange.location == NSNotFound) {
OSKTwitterTextEntity *entity = [OSKTwitterTextEntity entityWithType:OSKTwitterTextEntityScreenName range:NSMakeRange(atSignRange.location, NSMaxRange(screenNameRange) - atSignRange.location)];
[results addObject:entity];
} else {
OSKTwitterTextEntity *entity = [OSKTwitterTextEntity entityWithType:OSKTwitterTextEntityListName range:NSMakeRange(atSignRange.location, NSMaxRange(listNameRange) - atSignRange.location)];
[results addObject:entity];
}
} else {
// Avoid matching the second username in @username@username
end++;
}
position = end;
}
return results;
}
+ (OSKTwitterTextEntity*)repliedScreenNameInText:(NSString*)text
{
if (!text.length) {
return nil;
}
NSInteger len = text.length;
NSTextCheckingResult *matchResult = [[self validReplyRegexp] firstMatchInString:text options:(NSMatchingWithoutAnchoringBounds | NSMatchingAnchored) range:NSMakeRange(0, len)];
if (!matchResult || matchResult.numberOfRanges < 2) {
return nil;
}
NSRange replyRange = [matchResult rangeAtIndex:1];
NSInteger replyEnd = NSMaxRange(replyRange);
NSRange endMentionRange = [[self endMentionRegexp] rangeOfFirstMatchInString:text options:0 range:NSMakeRange(replyEnd, len - replyEnd)];
if (endMentionRange.location != NSNotFound) {
return nil;
}
return [OSKTwitterTextEntity entityWithType:OSKTwitterTextEntityScreenName range:replyRange];
}
+ (NSInteger)tweetLength:(NSString*)text
{
return [self tweetLength:text httpURLLength:HTTPShortURLLength httpsURLLength:HTTPSShortURLLength];
}
+ (NSInteger)tweetLength:(NSString*)text httpURLLength:(NSInteger)httpURLLength httpsURLLength:(NSInteger)httpsURLLength
{
text = [text precomposedStringWithCanonicalMapping];
if (!text.length) {
return 0;
}
// Remove URLs from text and add t.co length
NSMutableString *string = [text mutableCopy];
#if !__has_feature(objc_arc)
[string autorelease];
#endif
int urlLengthOffset = 0;
NSArray *urlEntities = [self URLsInText:text];
for (NSInteger i=urlEntities.count-1; i>=0; i--) {
OSKTwitterTextEntity *entity = [urlEntities objectAtIndex:i];
NSRange urlRange = entity.range;
NSString *url = [string substringWithRange:urlRange];
if ([url rangeOfString:@"https" options:(NSCaseInsensitiveSearch | NSAnchoredSearch)].location == 0) {
urlLengthOffset += httpsURLLength;
} else {
urlLengthOffset += httpURLLength;
}
[string deleteCharactersInRange:urlRange];
}
NSInteger len = string.length;
NSInteger charCount = len + urlLengthOffset;
if (len > 0) {
// Adjust count for non-BMP characters
UniChar buffer[len];
[string getCharacters:buffer range:NSMakeRange(0, len)];
for (int i=0; i<len; i++) {
UniChar c = buffer[i];
if (CFStringIsSurrogateHighCharacter(c)) {
if (i+1 < len) {
UniChar d = buffer[i+1];
if (CFStringIsSurrogateLowCharacter(d)) {
charCount--;
i++;
}
}
}
}
}
return charCount;
}
+ (NSInteger)remainingCharacterCount:(NSString*)text
{
return [self remainingCharacterCount:text httpURLLength:HTTPShortURLLength httpsURLLength:HTTPSShortURLLength];
}
+ (NSInteger)remainingCharacterCount:(NSString*)text httpURLLength:(NSInteger)httpURLLength httpsURLLength:(NSInteger)httpsURLLength
{
return MaxTweetLength - [self tweetLength:text httpURLLength:httpURLLength httpsURLLength:httpsURLLength];
}
#pragma mark - Regular Expressions and CharacterSet
+ (NSRegularExpression*)validURLRegexp
{
static NSRegularExpression *validURLRegexp;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
validURLRegexp = [[NSRegularExpression alloc] initWithPattern:TWUValidURL options:NSRegularExpressionCaseInsensitive error:NULL];
});
return validURLRegexp;
}
+ (NSRegularExpression*)validASCIIDomainRegexp
{
static NSRegularExpression *validASCIIDomainRegexp;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
validASCIIDomainRegexp = [[NSRegularExpression alloc] initWithPattern:TWUValidASCIIDomain options:NSRegularExpressionCaseInsensitive error:NULL];
});
return validASCIIDomainRegexp;
}
+ (NSRegularExpression*)invalidShortDomainRegexp
{
static NSRegularExpression *invalidShortDomainRegexp;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
invalidShortDomainRegexp = [[NSRegularExpression alloc] initWithPattern:TWUInvalidShortDomain options:NSRegularExpressionCaseInsensitive error:NULL];
});
return invalidShortDomainRegexp;
}
+ (NSRegularExpression*)validTCOURLRegexp
{
static NSRegularExpression *validTCOURLRegexp;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
validTCOURLRegexp = [[NSRegularExpression alloc] initWithPattern:TWUValidTCOURL options:NSRegularExpressionCaseInsensitive error:NULL];
});
return validTCOURLRegexp;
}
+ (NSRegularExpression*)validHashtagRegexp
{
static NSRegularExpression *validHashtagRegexp;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
validHashtagRegexp = [[NSRegularExpression alloc] initWithPattern:TWUValidHashtag options:NSRegularExpressionCaseInsensitive error:NULL];
});
return validHashtagRegexp;
}
+ (NSRegularExpression*)endHashtagRegexp
{
static NSRegularExpression *endHashtagRegexp;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
endHashtagRegexp = [[NSRegularExpression alloc] initWithPattern:TWUEndHashTagMatch options:NSRegularExpressionCaseInsensitive error:NULL];
});
return endHashtagRegexp;
}
+ (NSRegularExpression*)validCashtagRegexp
{
static NSRegularExpression *validCashtagRegexp;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
validCashtagRegexp = [[NSRegularExpression alloc] initWithPattern:TWUValidCashtag options:NSRegularExpressionCaseInsensitive error:NULL];
});
return validCashtagRegexp;
}
+ (NSRegularExpression*)validMentionOrListRegexp
{
static NSRegularExpression *validMentionOrListRegexp;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
validMentionOrListRegexp = [[NSRegularExpression alloc] initWithPattern:TWUValidMentionOrList options:NSRegularExpressionCaseInsensitive error:NULL];
});
return validMentionOrListRegexp;
}
+ (NSRegularExpression*)validReplyRegexp
{
static NSRegularExpression *validReplyRegexp;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
validReplyRegexp = [[NSRegularExpression alloc] initWithPattern:TWUValidReply options:NSRegularExpressionCaseInsensitive error:NULL];
});
return validReplyRegexp;
}
+ (NSRegularExpression*)endMentionRegexp
{
static NSRegularExpression *endMentionRegexp;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
endMentionRegexp = [[NSRegularExpression alloc] initWithPattern:TWUEndMentionMatch options:NSRegularExpressionCaseInsensitive error:NULL];
});
return endMentionRegexp;
}
+ (NSCharacterSet*)invalidURLWithoutProtocolPrecedingCharSet
{
static NSCharacterSet *invalidURLWithoutProtocolPrecedingCharSet;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
invalidURLWithoutProtocolPrecedingCharSet = [NSCharacterSet characterSetWithCharactersInString:@"-_./"];
#if !__has_feature(objc_arc)
[invalidURLWithoutProtocolPrecedingCharSet retain];
#endif
});
return invalidURLWithoutProtocolPrecedingCharSet;
}
@end
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