{% extends "docframe.html" %}
{% block body %}

<div class="page-header">
   <h1>
        Language Spec
        <small>The mini-language at the heart of pathoc and pathod.</small>
    </h1>
</div>

<ul class="nav nav-tabs">
  <li class="active" ><a href="#specifying_requests" data-toggle="tab">HTTP Requests</a></li>
  <li><a href="#specifying_responses" data-toggle="tab">HTTP Responses</a></li>
  <li><a href="#websockets" data-toggle="tab">Websocket Frames</a></li>
</ul>

<div class="tab-content">
    <div class="tab-pane" id="specifying_responses">
        {% include "docs_lang_responses.html" %}
    </div>
    <div class="tab-pane active" id="specifying_requests">
        {% include "docs_lang_requests.html" %}
    </div>
    <div class="tab-pane" id="websockets">
        {% include "docs_lang_websockets.html" %}
    </div>
</div>

<section id="features">
    <div class="page-header">
       <h1>Features</h1>
    </div>

        <a id="offsetspec"></a>
        <h2>OFFSET</h2>

            <p>Offsets are calculated relative to the base message, before any
            injections or other transforms are applied. They have 3 flavors:</p>

            <ul>
                <li>An integer byte offset </li>
                <li><b>r</b> for a random location</li>
                <li><b>a</b> for the end of the message</li>
            </ul>

        <a id="valuespec"></a>
        <h2>VALUE</h2>

        <h3>Literals</h3>

        <p>Literal values are specified as a quoted strings: </p>

        <pre class="example">"foo"</pre>

        <p>Either single or double quotes are accepted, and quotes can be escaped with
        backslashes within the string:</p>

        <pre class="example">'fo\'o'</pre>

        <p>Literal values can contain Python-style backslash escape sequences:</p>

        <pre class="example">'foo\r\nbar'</pre>


        <h3>Files</h3>

        <p>You can load a value from a specified file path. To do so, you have to specify
        a _staticdir_ option to pathod on the command-line, like so: </p>

        <pre class="example">pathod -d ~/myassets</pre>

        <p>All paths are relative paths under this directory. File loads are indicated by
        starting the value specifier with the left angle bracket:

        <pre class="example">&lt;my/path</pre></p>

        <p>The path value can also be a quoted string, with the same syntax as literals:</p>

        <pre class="example">&lt;"my/path"</pre>


        <h3>Generated values</h3>

        <p>An @-symbol lead-in specifies that generated data should be used. There are two
        components to a generator specification - a size, and a data type. By default
        pathod assumes a data type of "bytes". </p>

        <p>Here's a value specifier for generating 100 bytes:

        <pre class="example">@100</pre></p>

        <p>You can use standard suffixes to indicate larger values. Here, for instance, is
        a specifier for generating 100 megabytes:</p>

        <pre class="example">@100m</pre>

        <p>Data is generated and served efficiently - if you really want to send a
        terabyte of data to a client, pathod can do it. The supported suffixes are:</p>


        <table class="table table-bordered">
            <tbody >
                <tr>
                    <td>b</td> <td>1024**0 (bytes)</td>
                </tr>
                <tr>
                    <td>k</td> <td>1024**1 (kilobytes)</td>
                </tr>
                <tr>
                    <td>m</td> <td>1024**2 (megabytes)</td>
                </tr>
                <tr>
                    <td>g</td> <td>1024**3 (gigabytes)</td>
                </tr>
                <tr>
                    <td>t</td> <td>1024**4 (terabytes)</td>
                </tr>
            </tbody>
        </table>

        <p>Data types are separated from the size specification by a comma. This
        specification generates 100mb of ASCII:</p>

        <pre class="example">@100m,ascii</pre>

        <p>Supported data types are:</p>

        <table class="table table-bordered">
            <tbody >
                <tr>
                    <td>ascii</td>
                    <td>All ASCII characters</td>
                </tr>
                <tr>
                    <td>ascii_letters</td>
                    <td>A-Za-z</td>
                </tr>
                <tr>
                    <td>ascii_lowercase</td>
                    <td>a-z</td>
                </tr>
                <tr>
                    <td>ascii_uppercase</td>
                    <td>A-Z</td>
                </tr>
                <tr>
                    <td>bytes</td>
                    <td>All 256 byte values</td>
                </tr>
                <tr>
                    <td>digits</td>
                    <td>0-9</td>
                </tr>
                <tr>
                    <td>hexdigits</td>
                    <td>0-f</td>
                </tr>
                <tr>
                    <td>octdigits</td>
                    <td>0-7</td>
                </tr>
                <tr>
                    <td>punctuation</td>
                    <td>
                        <pre>!"#$%&\'()*+,-./:;<=>?@[\\]^_`{|}~</pre>
                    </td>
                </tr>
                <tr>
                    <td>whitespace</td>
                    <td>
                        <pre>\t\n\x0b\x0c\r and space</pre>
                    </td>
                </tr>
            </tbody>
        </table>
</section>

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