Drafter

Snowcrash parser harness

API Blueprint Parser

Drafter is complex builder of API Blueprint. Internally it uses Snowcrash library, reference API Blueprint parser.

API Blueprint is Web API documentation language. You can find API Blueprint documentation on the API Blueprint site.

Additionally Drafter provide set of Wrappers for serialization, of parsing result, via SOS library into JSON and YAML format.

Drafter also provides the user ability to select the type of the output. There are two possible values:

• API Elements Parse Result: Parse Result is defined in API Elements according to Parse Result Namespace.
• Normal AST Parse Result: Parse Result defined by the API Blueprint AST Parse Result. The AST is deprecated and only available in the Drafter command line tool.

By default, Drafter assumes the Refract Parse Result.

Both the types of Parse Results are available in two different serialization formats, YAML and JSON. YAML is the default for the CLI.

Status

• Format 1A9 fully implemented

Install

OS X using Homebrew:

$ brew install drafter

AUR package for Arch Linux.

Other systems refer to installation notes.

Usage

Drafter is both a library and a command line tool.

Command line tool

The command line tool allows you to parse a blueprint and/or check the validity of a blueprint.

$ cat << 'EOF' > blueprint.apib
# My API
## GET /message
+ Response 200 (text/plain)

        Hello World!
EOF

$ drafter blueprint.apib
element: "parseResult"
content:
  -
    element: "category"
    meta:
      classes:
        - "api"
      title: "My API"
...

See parse feature for the details on using the drafter command line tool.

C/C++ API

Please refer to drafter.h for the full API documentation. See Drafter bindings for using the library in other languages.

Parsing a blueprint to a JSON or YAML string

The drafter_parse_blueprint_to takes a source blueprint and returns the given blueprint parsed and serialized as API Elements in YAML or JSON.

int drafter_parse_blueprint_to(const char* source, char ** out, const drafter_options options);

#include <drafter/drafter.h>

const char* blueprint =
  "# My API\n"
  "## GET /message\n"
  "+ Response 200 (text/plain)\n"
  "\n"
  "      Hello World!\n";

drafter_options options;
options.format = DRAFTER_SERIALIZE_JSON;
options.sourcemap = true;

char* result = NULL;
if (drafter_parse_blueprint_to(blueprint, &result, options) == 0) {
    printf("%s\n", result);
    free(result);
}

Checking the validity of a blueprint

The drafter_check_blueprint function allows checking the validity of a blueprint. This function will return a drafter_result when the blueprint produces warnings and/or errors. With a drafter_result, the drafter_serialize function can be used to serialized the result as API Elements in YAML or JSON.

drafter_result* drafter_check_blueprint(const char* source);

#include <drafter/drafter.h>

const char* blueprint =
  "# My API\n"
  "## GET /message\n"
  "+ Response 200 (text/plain)\n"
  "\n"
  "      Hello World!\n";

drafter_result* result = drafter_check_blueprint(blueprint);
if (result) {
    // Serialize the result to print the warnings/errors

    drafter_options options;
    options.format = DRAFTER_SERIALIZE_JSON;
    options.sourcemap = true;

    char* out = drafter_serialize(result, options);
    printf("The blueprint produces warnings or errors:\n\n%s\n", out);
    free(out);

    drafter_free_result(result);
} else {
    printf("The given blueprint was valid.\n");
}

Installation

Building Drafter will require a modern C++ compiler and CMake. The following compilers are tested and known to work:

Compiler	Minimum Version
Clang	4.0
GCC	5.3
MSVC++	2015

The following steps can be used to build and install Drafter:

1. Download a stable release of Drafter (release tarballs can be found in GitHub Releases):

   $ curl -OL <url to drafter release from GitHub releases>
   $ tar xvf drafter.tar.gz
   $ cd drafter

   Alternatively, you can clone the source repository, for example:

   $ git clone --recursive https://github.com/apiaryio/drafter.git
   $ cd drafter

2. Build & Install Drafter:

   POSIX (macOS/Linux):

   $ mkdir build
   $ cd build
   $ cmake ..
   $ make
   $ [sudo] make install

   NOTE: You can use cmake -DCMAKE_INSTALL_PREFIX="$HOME/.local .. if you don't want a system wide install.

   Windows:

   > mkdir build
   > cd build
   > cmake ..
   > cmake --build . --target drafter --config Release

   On Windows, drafter.exe can be found inside src\Release

3. You can now use Drafter CLI and library:

   $ drafter --help

Bindings

Drafter bindings in other languages:

• drafter-npm (Node.js)
• drafter.js (Pure JavaScript)
• RedSnow (Ruby)
• DrafterPy (Python)

CLI Wrapper

• fury-cli (Node.js)
• Drafter-php (PHP)

Contribute

Fork & Pull Request

If you want to create a binding for Drafter please refer to the Writing a Binding article.

License

MIT License. See the LICENSE file.