ast_helper

# ast_helper

## Installation

```
$ git checkout https://github.com/bcardiff/crystal-ast-helper.git
$ cd crystal-ast-helper
$ shards
$ crystal src/ast_helper.cr

$ open http://localhost:9090
```

If you want to use with crystal head use:

```
$ path/to/crystal-clone/bin/crystal src/ast_helper.cr
```

## Usage

When opening [http://localhost:9090](http://localhost:9090) you will be able to:

* input source
* view the output according to the formatter
* view the tokens returned by the lexer used for parsing and for formatting
  * view the tokens consumed so far even if the formatter fails
* view the stack trace of each token
* view the AST of the whole program

![](https://user-images.githubusercontent.com/459923/46692683-4d02af80-cbde-11e8-8af4-443432567a99.gif)


## Contributing

1. Fork it (<https://github.com/bcardiff/crystal-ast-helper/fork>)
2. Create your feature branch (`git checkout -b my-new-feature`)
3. Commit your changes (`git commit -am 'Add some feature'`)
4. Push to the branch (`git push origin my-new-feature`)
5. Create a new Pull Request

## Contributors

- [bcardiff](https://github.com/bcardiff) Brian J. Cardiff - creator, maintainer