README.md

# Absinthe

[GraphQL](https://facebook.github.io/graphql/) implementation for Elixir.

[![Build Status](https://secure.travis-ci.org/absinthe-graphql/absinthe.svg?branch=master
"Build Status")](https://travis-ci.org/absinthe-graphql/absinthe)

Goals:

- Complete implementation of the [GraphQL Working Draft](https://facebook.github.io/graphql), dated October 2015
- An idiomatic, readable, and comfortable API for Elixir developers
- Detailed error messages and documentation
- A focus on robustness and production-level performance

Please see the website at [http://absinthe-graphql.org](http://absinthe-graphql.org).

## Features

- Parser
  - All AST types
  - Fragments and type conditions
  - Line number reporting
  - ~~Column number reporting~~ (Not currently available due to Leex tokenizer constraint)
- Schema definition
  - All types (eg, Object, Input Object, Enum, Union, Interface, Scalar)
  - Circular type references
  - Support for [custom scalars](http://absinthe-graphql.org/guides/custom-scalars/)
  - Support for custom directives
  - Field, argument, and enum value [deprecation](http://absinthe-graphql.org/guides/deprecation/)
  - Compile-time schema validation
- [Introspection](http://absinthe-graphql.org/guides/introspection/), compatible with GraphiQL
- Query execution
  - General
  - Named fragments, inline fragments, and fragment spreads with type conditions
  - `@skip` and `@include` directives
  - [Adapter](http://absinthe-graphql.org/guides/adapters/) mechanism to support conversion between camelCase query documents
    and snake_cased schema definition.

## Installation

Install from [Hex.pm](https://hex.pm/packages/absinthe):

```elixir
def deps do
  [{:absinthe, "~> 1.1.0"}]
end
```

Add it to your `applications` configuration in `mix.exs`, too:

```elixir
def application do
  [applications: [:absinthe]]
end
```

Note: Absinthe requires Elixir 1.2 or higher.

## Upgrading

See [CHANGELOG](./CHANGELOG.md) for upgrade steps between versions.

## Documentation

- For the tutorial, guides, and general information about Absinthe-related
  projects, see [http://absinthe-graphql.org](http://absinthe-graphql.org).
- Links to the API documentation are available in the [project list](http://absinthe-graphql.org/projects/).

### Roadmap

See the Roadmap on [absinthe-graphql.org](http://absinthe-graphql.org/roadmap/).

## Related Projects

See the Project List on [absinthe-graphql.org](http://absinthe-graphql.org/projects).

## License

BSD License

Copyright (c) CargoSense, Inc.

Parser derived from GraphQL Elixir, Copyright (c) Josh Price
https://github.com/graphql-elixir/graphql-elixir

Redistribution and use in source and binary forms, with or without modification,
are permitted provided that the following conditions are met:

 * Redistributions of source code must retain the above copyright notice, this
   list of conditions and the following disclaimer.

 * Redistributions in binary form must reproduce the above copyright notice,
   this list of conditions and the following disclaimer in the documentation
   and/or other materials provided with the distribution.

 * Neither the name Facebook nor the names of its contributors may be used to
   endorse or promote products derived from this software without specific
   prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
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(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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