9596806644
to be used for unordered map storage. This is because AAs still don't work correctly and even if they did, require the user to define both toHash and opCmp/opEquals for every YAML struct/class. Now only opCmp needs to be defined. Documentation/tutorials/examples have been updated accordingly.
244 lines
14 KiB
HTML
244 lines
14 KiB
HTML
|
|
|
|
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
|
|
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
|
|
|
|
<html xmlns="http://www.w3.org/1999/xhtml">
|
|
<head>
|
|
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
|
|
|
|
<title>Getting started — D:YAML v0.3 documentation</title>
|
|
<link rel="stylesheet" href="../_static/default.css" type="text/css" />
|
|
<link rel="stylesheet" href="../_static/pygments.css" type="text/css" />
|
|
<script type="text/javascript">
|
|
var DOCUMENTATION_OPTIONS = {
|
|
URL_ROOT: '../',
|
|
VERSION: '0.3',
|
|
COLLAPSE_INDEX: false,
|
|
FILE_SUFFIX: '.html',
|
|
HAS_SOURCE: true
|
|
};
|
|
</script>
|
|
<script type="text/javascript" src="../_static/jquery.js"></script>
|
|
<script type="text/javascript" src="../_static/underscore.js"></script>
|
|
<script type="text/javascript" src="../_static/doctools.js"></script>
|
|
<link rel="top" title="D:YAML v0.3 documentation" href="../index.html" />
|
|
<link rel="next" title="Custom YAML data types" href="custom_types.html" />
|
|
<link rel="prev" title="Welcome to D:YAML documentation!" href="../index.html" />
|
|
</head>
|
|
<body>
|
|
<div class="related">
|
|
<h3>Navigation</h3>
|
|
<ul>
|
|
<li class="right" style="margin-right: 10px">
|
|
<a href="custom_types.html" title="Custom YAML data types"
|
|
accesskey="N">next</a></li>
|
|
<li class="right" >
|
|
<a href="../index.html" title="Welcome to D:YAML documentation!"
|
|
accesskey="P">previous</a> |</li>
|
|
<li><a href="../index.html">D:YAML v0.3 documentation</a> »</li>
|
|
</ul>
|
|
</div>
|
|
|
|
<div class="document">
|
|
<div class="documentwrapper">
|
|
<div class="bodywrapper">
|
|
<div class="body">
|
|
|
|
<div class="section" id="getting-started">
|
|
<h1>Getting started<a class="headerlink" href="#getting-started" title="Permalink to this headline">¶</a></h1>
|
|
<p>Welcome to D:YAML! D:YAML is a <a class="reference external" href="http://en.wikipedia.org/wiki/YAML">YAML</a>
|
|
parser library for the
|
|
<a class="reference external" href="http://d-programming-language.org">D programming language</a>. This tutorial
|
|
will explain how to set D:YAML up and use it in your projects.</p>
|
|
<p>This is meant to be the <strong>simplest possible</strong> introduction to D:YAML. Some of
|
|
this information might already be known to you. Only basic usage is covered.</p>
|
|
<div class="section" id="setting-up">
|
|
<h2>Setting up<a class="headerlink" href="#setting-up" title="Permalink to this headline">¶</a></h2>
|
|
<div class="section" id="install-the-dmd-compiler">
|
|
<h3>Install the DMD compiler<a class="headerlink" href="#install-the-dmd-compiler" title="Permalink to this headline">¶</a></h3>
|
|
<p>Digital Mars D compiler, or DMD, is the most commonly used D compiler. You can
|
|
find its newest version <a class="reference external" href="http://www.digitalmars.com/d/download.html">here</a>.
|
|
Download the version of DMD for your operating system and install it.</p>
|
|
<div class="admonition note">
|
|
<p class="first admonition-title">Note</p>
|
|
<p class="last">Other D compilers exist, such as
|
|
<a class="reference external" href="http://bitbucket.org/goshawk/gdc/wiki/Home">GDC</a> and
|
|
<a class="reference external" href="http://www.dsource.org/projects/ldc/">LDC</a>. Setting up with either one of
|
|
them should be similar to DMD, but they are not yet as stable as DMD.</p>
|
|
</div>
|
|
</div>
|
|
<div class="section" id="download-and-compile-d-yaml">
|
|
<h3>Download and compile D:YAML<a class="headerlink" href="#download-and-compile-d-yaml" title="Permalink to this headline">¶</a></h3>
|
|
<p>The newest version of D:YAML can be found
|
|
<a class="reference external" href="https://github.com/Kiith-Sa/D-YAML">here</a>. Download a source archive, extract
|
|
it, and move to the extracted directory.</p>
|
|
<p>D:YAML uses a modified version of the <a class="reference external" href="http://dsource.org/projects/cdc/">CDC</a>
|
|
script for compilation. To compile D:YAML, you first need to build CDC.
|
|
Do this by typing the following command into the console:</p>
|
|
<div class="highlight-python"><pre>dmd cdc.d</pre>
|
|
</div>
|
|
<p>Now compile D:YAML with CDC.
|
|
To do this on Unix/Linux, use the following command:</p>
|
|
<div class="highlight-python"><pre>./cdc</pre>
|
|
</div>
|
|
<p>On Windows:</p>
|
|
<div class="highlight-python"><div class="highlight"><pre><span class="n">cdc</span><span class="o">.</span><span class="n">exe</span>
|
|
</pre></div>
|
|
</div>
|
|
<p>This will compile the library to a file called <tt class="docutils literal"><span class="pre">libdyaml.a</span></tt> on Unix/Linux or
|
|
<tt class="docutils literal"><span class="pre">libdyaml.lib</span></tt> on Windows.</p>
|
|
</div>
|
|
</div>
|
|
<div class="section" id="your-first-d-yaml-project">
|
|
<h2>Your first D:YAML project<a class="headerlink" href="#your-first-d-yaml-project" title="Permalink to this headline">¶</a></h2>
|
|
<p>Create a directory for your project and in that directory, create a file called
|
|
<tt class="docutils literal"><span class="pre">input.yaml</span></tt> with the following contents:</p>
|
|
<div class="highlight-yaml"><div class="highlight"><pre><span class="l-Scalar-Plain">Hello World</span> <span class="p-Indicator">:</span>
|
|
<span class="p-Indicator">-</span> <span class="l-Scalar-Plain">Hello</span>
|
|
<span class="p-Indicator">-</span> <span class="l-Scalar-Plain">World</span>
|
|
<span class="l-Scalar-Plain">Answer</span><span class="p-Indicator">:</span> <span class="l-Scalar-Plain">42</span>
|
|
</pre></div>
|
|
</div>
|
|
<p>This will serve as input for our example.</p>
|
|
<p>Now we need to parse it. Create a file called <tt class="docutils literal"><span class="pre">main.d</span></tt>. Paste following code
|
|
into the file:</p>
|
|
<div class="highlight-d"><div class="highlight"><pre><span class="k">import</span> <span class="n">std</span><span class="p">.</span><span class="n">stdio</span><span class="p">;</span>
|
|
<span class="k">import</span> <span class="n">yaml</span><span class="p">;</span>
|
|
|
|
<span class="kt">void</span> <span class="n">main</span><span class="p">()</span>
|
|
<span class="p">{</span>
|
|
<span class="c1">//Read the input.</span>
|
|
<span class="n">Node</span> <span class="n">root</span> <span class="p">=</span> <span class="n">Loader</span><span class="p">(</span><span class="s">"input.yaml"</span><span class="p">).</span><span class="n">load</span><span class="p">();</span>
|
|
|
|
<span class="c1">//Display the data read.</span>
|
|
<span class="k">foreach</span><span class="p">(</span><span class="nb">string</span> <span class="n">word</span><span class="p">;</span> <span class="n">root</span><span class="p">[</span><span class="s">"Hello World"</span><span class="p">])</span>
|
|
<span class="p">{</span>
|
|
<span class="n">writeln</span><span class="p">(</span><span class="n">word</span><span class="p">);</span>
|
|
<span class="p">}</span>
|
|
<span class="n">writeln</span><span class="p">(</span><span class="s">"The answer is "</span><span class="p">,</span> <span class="n">root</span><span class="p">[</span><span class="s">"Answer"</span><span class="p">].</span><span class="n">as</span><span class="p">!</span><span class="kt">int</span><span class="p">);</span>
|
|
|
|
<span class="c1">//Dump the loaded document to output.yaml.</span>
|
|
<span class="n">Dumper</span><span class="p">(</span><span class="s">"output.yaml"</span><span class="p">).</span><span class="n">dump</span><span class="p">(</span><span class="n">root</span><span class="p">);</span>
|
|
<span class="p">}</span>
|
|
</pre></div>
|
|
</div>
|
|
<div class="section" id="explanation-of-the-code">
|
|
<h3>Explanation of the code<a class="headerlink" href="#explanation-of-the-code" title="Permalink to this headline">¶</a></h3>
|
|
<p>First, we import the <em>yaml</em> module. This is the only D:YAML module you need to
|
|
import - it automatically imports all needed modules.</p>
|
|
<p>Next we load the file using the <em>Loader.load()</em> method. <em>Loader</em> is a struct
|
|
used for parsing YAML documents. The <em>load()</em> method loads the file as
|
|
<strong>one</strong> YAML document, or throws <em>YAMLException</em>, D:YAML exception type, if the
|
|
file could not be parsed or does not contain exactly one document. Note that we
|
|
don’t do any error checking here in order to keep the example as simple as
|
|
possible.</p>
|
|
<p><em>Node</em> represents a node in a YAML document. It can be a sequence (array),
|
|
mapping (associative array) or a scalar (value). Here the root node is a
|
|
mapping, and we use the index operator to get subnodes with keys “Hello World”
|
|
and “Answer”. We iterate over the first, as it is a sequence, and use the
|
|
<em>Node.as()</em> method on the second to read its value as an integer.</p>
|
|
<p>You can iterate over a mapping or sequence as if it was an associative or normal
|
|
array. If you try to iterate over a scalar, it will throw a <em>YAMLException</em>.</p>
|
|
<p>You can iterate over subnodes using <em>Node</em> as the iterated type, or specify
|
|
the type subnodes are expected to have. D:YAML will automatically convert
|
|
iterated subnodes to that type if possible. Here we specify the <em>string</em> type,
|
|
so we iterate over the “Hello World” sequence as an array of strings. If it is
|
|
not possible to convert to iterated type, a <em>YAMLException</em> is thrown. For
|
|
instance, if we specified <em>int</em> here, we would get an error, as “Hello”
|
|
cannot be converted to an integer.</p>
|
|
<p>The <em>Node.as()</em> method is used to read value of a scalar node as specified type.
|
|
D:YAML will try to return the scalar as this type, converting if needed,
|
|
throwing <em>YAMLException</em> if not possible.</p>
|
|
<p>Finally we dump the document we just read to <tt class="docutils literal"><span class="pre">output.yaml</span></tt> with the
|
|
<em>Dumper.dump()</em> method. <em>Dumper</em> is a struct used to dump YAML documents.
|
|
The <em>dump()</em> method writes one or more documents to a file, throwing
|
|
<em>YAMLException</em> if the file could not be written to.</p>
|
|
<p>D:YAML doesn’t preserve style information in documents, so even though
|
|
<tt class="docutils literal"><span class="pre">output.yaml</span></tt> will contain the same data as <tt class="docutils literal"><span class="pre">input.yaml</span></tt>, it might be
|
|
formatted differently. Comments are not preserved, either.</p>
|
|
</div>
|
|
<div class="section" id="compiling">
|
|
<h3>Compiling<a class="headerlink" href="#compiling" title="Permalink to this headline">¶</a></h3>
|
|
<p>To compile your project, DMD needs to know which directories contain the
|
|
imported modules and the library. You also need to tell it to link with D:YAML.
|
|
The import directory should be the D:YAML package directory. You can specify it
|
|
using the <tt class="docutils literal"><span class="pre">-I</span></tt> option of DMD. The library directory should point to the
|
|
compiled library. On Unix/Linux you can specify it using the <tt class="docutils literal"><span class="pre">-L-L</span></tt> option,
|
|
and link with D:YAML using the <tt class="docutils literal"><span class="pre">-L-l</span></tt> option. On Windows, the import directory
|
|
is used as the library directory. To link with the library on Windows, just add
|
|
the path to it relative to the current directory.</p>
|
|
<p>For example, if you extracted and compiled D:YAML in <tt class="docutils literal"><span class="pre">/home/xxx/dyaml</span></tt>, your
|
|
project is in <tt class="docutils literal"><span class="pre">/home/xxx/dyaml-project</span></tt>, and you are currently in that
|
|
directory, compile the project with the following command on Unix/Linux:</p>
|
|
<div class="highlight-python"><pre>dmd -I../dyaml -L-L../dyaml -L-ldyaml main.d</pre>
|
|
</div>
|
|
<p>And the following on Windows:</p>
|
|
<div class="highlight-python"><pre>dmd -I../dyaml ../dyaml/libdyaml.lib main.d</pre>
|
|
</div>
|
|
<p>This will produce an executable called <tt class="docutils literal"><span class="pre">main</span></tt> or <tt class="docutils literal"><span class="pre">main.exe</span></tt> in your
|
|
directory. When you run it, it should produce the following output:</p>
|
|
<div class="highlight-python"><pre>Hello
|
|
World
|
|
The answer is 42</pre>
|
|
</div>
|
|
</div>
|
|
<div class="section" id="conclusion">
|
|
<h3>Conclusion<a class="headerlink" href="#conclusion" title="Permalink to this headline">¶</a></h3>
|
|
<p>You should now have a basic idea about how to use D:YAML. To learn more, look at
|
|
the <a class="reference external" href="../api/index.html">API documentation</a> and other tutorials. You can find code for this
|
|
example in the <tt class="docutils literal"><span class="pre">example/getting_started</span></tt> directory in the package.</p>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
|
|
|
|
</div>
|
|
</div>
|
|
</div>
|
|
<div class="sphinxsidebar">
|
|
<div class="sphinxsidebarwrapper">
|
|
<p class="logo"><a href="../index.html">
|
|
<img class="logo" src="../_static/logo210.png" alt="Logo"/>
|
|
</a></p>
|
|
<h3><a href="../index.html">Table Of Contents</a></h3>
|
|
<ul>
|
|
<li><a class="reference internal" href="#">Getting started</a><ul>
|
|
<li><a class="reference internal" href="#setting-up">Setting up</a><ul>
|
|
<li><a class="reference internal" href="#install-the-dmd-compiler">Install the DMD compiler</a></li>
|
|
<li><a class="reference internal" href="#download-and-compile-d-yaml">Download and compile D:YAML</a></li>
|
|
</ul>
|
|
</li>
|
|
<li><a class="reference internal" href="#your-first-d-yaml-project">Your first D:YAML project</a><ul>
|
|
<li><a class="reference internal" href="#explanation-of-the-code">Explanation of the code</a></li>
|
|
<li><a class="reference internal" href="#compiling">Compiling</a></li>
|
|
<li><a class="reference internal" href="#conclusion">Conclusion</a></li>
|
|
</ul>
|
|
</li>
|
|
</ul>
|
|
</li>
|
|
</ul>
|
|
|
|
</div>
|
|
</div>
|
|
<div class="clearer"></div>
|
|
</div>
|
|
<div class="related">
|
|
<h3>Navigation</h3>
|
|
<ul>
|
|
<li class="right" style="margin-right: 10px">
|
|
<a href="custom_types.html" title="Custom YAML data types"
|
|
>next</a></li>
|
|
<li class="right" >
|
|
<a href="../index.html" title="Welcome to D:YAML documentation!"
|
|
>previous</a> |</li>
|
|
<li><a href="../index.html">D:YAML v0.3 documentation</a> »</li>
|
|
</ul>
|
|
</div>
|
|
<div class="footer">
|
|
© Copyright 2011, Ferdinand Majerech. Based on PyYAML http://www.pyyaml.org by Kirill Simonov.
|
|
Last updated on Jan 23, 2012.
|
|
Created using <a href="http://sphinx.pocoo.org/">Sphinx</a> 1.0.7.
|
|
</div>
|
|
</body>
|
|
</html> |