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README.md

twitter-text

This is the Objective-C implementation of the twitter-text parsing library. The library has methods to parse Tweets and calculate length, validity, parse @mentions, #hashtags, URLs, and more.

This library supports OS X 10.11+ and iOS 9+.

Setup

Make sure Xcode 9+ is already installed.

Run the following command to setup xcodebuild on the command line:

% sudo xcode-select -switch /Applications/Xcode.app/Contents/Developer

Conformance tests

To run the Conformance test suite from the command line via rake:

% rake test:conformance:run

You can also run the tests from within Xcode itself. Open the project file and run the tests are you normally would (Cmd-U).

If you need to, you can convert the yml tests that are shared with the other language implementations to json via the following:

% rake test:conformance:convert_tests

API

twitter-text 2.0 introduces configuration files that define how Tweets are parsed for length. This allows for backwards compatibility and flexibility going forward. Old-style traditional 140-character parsing is defined by the v1.json configuration file, whereas v2.json is updated for "weighted" Tweets where ranges of Unicode code points can have independent weights aside from the default weight. The sum of all code points, each weighted appropriately, should not exceed the max weighted length.

Some old methods from twitter-text 1.0 have been marked deprecated, such as the various +tweetLength: methods. The new API is based on the following method, -parseTweet:

- (TwitterTextParseResults *)parseTweet:(NSString *)text

This method takes a string as input and returns a results object that contains information about the string. TwitterTextParseResults includes:

  • (NSInteger)weightedLength: the overall length of the Tweet with code points weighted per the ranges defined in the configuration file.

  • (NSInteger)permillage: indicates the proportion (per thousand) of the weighted length in comparison to the max weighted length. A value > 1000 indicates input text that is longer than the allowable maximum.

  • (BOOL)isValid: indicates if input text length corresponds to a valid result.

  • (NSRange)displayTextRange: An array of two unicode code point indices identifying the inclusive start and exclusive end of the displayable content of the Tweet.

  • (NSRange)validDisplayTextRange: An array of two unicode code point indices identifying the inclusive start and exclusive end of the valid content of the Tweet.

Issues

Have a bug? Please create an issue here on GitHub!

https://github.com/twitter/twitter-text/issues

Authors

License

Copyright 2012-2020 Twitter, Inc and other contributors

Licensed under the Apache License, Version 2.0