JavaAsSwift contains the java files with extensions replaced by. (Note: currently, J2S is not always writing output with native line breaks on macOS, hence pipe the output through tr -d '\r' to strip CR from CRLF line breaks.on the fix list.)Īdditional options offered by J2S.sh: -timed to emit timing, and -javaxxxx to pass xxxx as a parameter to java these options must appear before any pass-through options.Īn arguments file is useful with -a for passing mappings that are frequently used, e.g.:Ī possible workflow, assuming you are using git, is to use three branches, JavaAsSwift, J2S and dev, as follows: Map 'type' to 'replacement' in generated Swift output Insert arguments from this file into the argument list as if inserted at this position on the command line one argument per line lines are whitespace trimmed empty lines are ignored hash-suffix to line-end is ignored.ĭefine a value for a key that the converter will use absent value => value=1 Input and output paths subsequent to this argument can be specified relative to this directory If this option not used, then take input from stdinĮnclosing directory must exist if this option is not used, then send output to stdoutįorce overwrite of existing file (the default is not to overwrite) Skip this step the first time around and only come back to it if using J2S fails with a version mismatch between the antlr runtime and the source pulled from github (currently generated by ANTLR 4.6). Get antlr to regenerate the basic Java8 parser, visitor and listener source.
(optional) There is also a useful ANTLR v4 plugin available to download via Preferences > Plugins. (optional) To run from within IntelliJ, go to Run > Edit Configurations…, click on +, select an Application configuration, set Main class to 2S (yes twice) and add -a path-to-your-arguments-file through which you can specify input, output and options (described below in use).
(If you installed with homebrew, then obtain it from CLASSPATH in $ cat $(which antlr4), omitting the trailing. Go to File > Project Structure > Libraries, click on +, choose java library, and paste in the path to the antlr jar. If you use IntelliJ, then when you open the J2S project
Java to swift converter 2017 android#
You can build this project with the IntelliJ IDE (Community or Ultimate) or other Java dev IDEs, but not Android Studio (project file incompatibilities). InstallĪNTLR 4.6 (Easiest using homebrew.
Java to swift converter 2017 manual#
Instead, it gets you over the initial conversion hurdle, from which point you use a mixture of manual and automated conversion, as suggested in Workflow. It is far from perfect and will never understand the code in the way that a compiler can. J2S aims to do most of the syntax conversion work for you. Torsten Louland, Satisfying Structures BVBA
J2S - Yet another Java to Swift converter (Java 8, Swift 3)
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