marshal.html 22 KB

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  20. <h1 class="title">std/marshal</h1>
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  45. <ul class="simple simple-toc" id="toc-list">
  46. <li><a class="reference" id="basic-usage_toc" href="#basic-usage">Basic usage</a></li>
  47. <li><a class="reference" id="see-also_toc" href="#see-also">See also</a></li>
  48. <li>
  49. <a class="reference reference-toplevel" href="#6" id="56">Imports</a>
  50. </li>
  51. <li>
  52. <details open>
  53. <summary><a class="reference reference-toplevel" href="#12" id="62">Procs</a></summary>
  54. <ul class="simple simple-toc-section">
  55. <ul class="simple nested-toc-section">$$
  56. <li><a class="reference" href="#%24%24%2CsinkT" title="`$$`[T](x: sink T): string">`$$`[T](x: sink T): string</a></li>
  57. </ul>
  58. <ul class="simple nested-toc-section">load
  59. <li><a class="reference" href="#load%2CStream%2CT" title="load[T](s: Stream; data: var T)">load[T](s: Stream; data: var T)</a></li>
  60. </ul>
  61. <ul class="simple nested-toc-section">store
  62. <li><a class="reference" href="#store%2CStream%2CsinkT" title="store[T](s: Stream; data: sink T)">store[T](s: Stream; data: sink T)</a></li>
  63. </ul>
  64. <ul class="simple nested-toc-section">to
  65. <li><a class="reference" href="#to%2Cstring" title="to[T](data: string): T">to[T](data: string): T</a></li>
  66. </ul>
  67. </ul>
  68. </details>
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  71. </div>
  72. <div class="nine columns" id="content">
  73. <a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/marshal.nim#L1" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
  74. <a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/marshal.nim#L1" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
  75. <div id="tocRoot"></div>
  76. <p class="module-desc"><p>This module contains procs for <span id="serialization_1">serialization</span> and <span id="deserialization_1">deserialization</span> of arbitrary Nim data structures. The serialization format uses <span id="json_1">JSON</span>.</p>
  77. <p><strong>Restriction:</strong> For objects, their type is <strong>not</strong> serialized. This means essentially that it does not work if the object has some other runtime type than its compiletime type.</p>
  78. <h1><a class="toc-backref" id="basic-usage" href="#basic-usage">Basic usage</a></h1>
  79. <p><strong class="examples_text">Example:</strong></p>
  80. <pre class="listing"><span class="Keyword">import</span> <span class="Identifier">std</span><span class="Operator">/</span><span class="Identifier">marshal</span>
  81. <span class="Keyword">type</span>
  82. <span class="Identifier">A</span> <span class="Operator">=</span> <span class="Keyword">object</span> <span class="Keyword">of</span> <span class="Identifier">RootObj</span>
  83. <span class="Identifier">B</span> <span class="Operator">=</span> <span class="Keyword">object</span> <span class="Keyword">of</span> <span class="Identifier">A</span>
  84. <span class="Identifier">f</span><span class="Punctuation">:</span> <span class="Identifier">int</span>
  85. <span class="Keyword">let</span> <span class="Identifier">a</span><span class="Punctuation">:</span> <span class="Keyword">ref</span> <span class="Identifier">A</span> <span class="Operator">=</span> <span class="Identifier">new</span><span class="Punctuation">(</span><span class="Identifier">B</span><span class="Punctuation">)</span>
  86. <span class="Identifier">assert</span> <span class="Operator">$$</span><span class="Identifier">a</span><span class="Punctuation">[</span><span class="Punctuation">]</span> <span class="Operator">==</span> <span class="StringLit">&quot;{}&quot;</span> <span class="Comment"># not &quot;{f: 0}&quot;</span>
  87. <span class="Comment"># unmarshal</span>
  88. <span class="Keyword">let</span> <span class="Identifier">c</span> <span class="Operator">=</span> <span class="Identifier">to</span><span class="Punctuation">[</span><span class="Identifier">B</span><span class="Punctuation">]</span><span class="Punctuation">(</span><span class="LongStringLit">&quot;&quot;&quot;{&quot;f&quot;: 2}&quot;&quot;&quot;</span><span class="Punctuation">)</span>
  89. <span class="Identifier">assert</span> <span class="Identifier">typeof</span><span class="Punctuation">(</span><span class="Identifier">c</span><span class="Punctuation">)</span> <span class="Keyword">is</span> <span class="Identifier">B</span>
  90. <span class="Identifier">assert</span> <span class="Identifier">c</span><span class="Operator">.</span><span class="Identifier">f</span> <span class="Operator">==</span> <span class="DecNumber">2</span>
  91. <span class="Comment"># marshal</span>
  92. <span class="Identifier">assert</span> <span class="Operator">$$</span><span class="Identifier">c</span> <span class="Operator">==</span> <span class="LongStringLit">&quot;&quot;&quot;{&quot;f&quot;: 2}&quot;&quot;&quot;</span></pre><strong>Note:</strong> The <tt class="docutils literal"><span class="pre"><span class="Identifier">to</span></span></tt> and <tt class="docutils literal"><span class="pre"><span class="Operator">$$</span></span></tt> operations are available at compile-time!
  93. <h1><a class="toc-backref" id="see-also" href="#see-also">See also</a></h1><ul class="simple"><li><a class="reference external" href="streams.html">streams module</a></li>
  94. <li><a class="reference external" href="json.html">json module</a></li>
  95. </ul>
  96. </p>
  97. <div class="section" id="6">
  98. <h1><a class="toc-backref" href="#6">Imports</a></h1>
  99. <dl class="item">
  100. <a class="reference external" href="streams.html">streams</a>, <a class="reference external" href="typeinfo.html">typeinfo</a>, <a class="reference external" href="json.html">json</a>, <a class="reference external" href="intsets.html">intsets</a>, <a class="reference external" href="tables.html">tables</a>, <a class="reference external" href="unicode.html">unicode</a>, <a class="reference external" href="assertions.html">assertions</a>, <a class="reference external" href="formatfloat.html">formatfloat</a>
  101. </dl>
  102. </div>
  103. <div class="section" id="12">
  104. <h1><a class="toc-backref" href="#12">Procs</a></h1>
  105. <dl class="item">
  106. <div id="$$-procs-all">
  107. <div id="$$,sinkT">
  108. <dt><pre><span class="Keyword">proc</span> <a href="#%24%24%2CsinkT"><span class="Identifier">`$$`</span></a><span class="Other">[</span><span class="Identifier">T</span><span class="Other">]</span><span class="Other">(</span><span class="Identifier">x</span><span class="Other">:</span> <a href="system.html#sink"><span class="Identifier">sink</span></a> <span class="Identifier">T</span><span class="Other">)</span><span class="Other">:</span> <a href="system.html#string"><span class="Identifier">string</span></a></pre></dt>
  109. <dd>
  110. <p>Returns a string representation of <tt class="docutils literal"><span class="pre"><span class="Identifier">x</span></span></tt> (serialization, marshalling).</p>
  111. <p><strong>Note:</strong> to serialize <tt class="docutils literal"><span class="pre"><span class="Identifier">x</span></span></tt> to JSON use <tt class="docutils literal"><span class="pre"><span class="Operator">%</span><span class="Identifier">x</span></span></tt> from the <tt class="docutils literal"><span class="pre"><span class="Identifier">json</span></span></tt> module or <tt class="docutils literal"><span class="pre"><span class="Identifier">jsonutils</span><span class="Operator">.</span><span class="Identifier">toJson</span><span class="Punctuation">(</span><span class="Identifier">x</span><span class="Punctuation">)</span></span></tt>.</p>
  112. <p><strong class="examples_text">Example:</strong></p>
  113. <pre class="listing"><span class="Keyword">type</span>
  114. <span class="Identifier">Foo</span> <span class="Operator">=</span> <span class="Keyword">object</span>
  115. <span class="Identifier">id</span><span class="Punctuation">:</span> <span class="Identifier">int</span>
  116. <span class="Identifier">bar</span><span class="Punctuation">:</span> <span class="Identifier">string</span>
  117. <span class="Keyword">let</span> <span class="Identifier">x</span> <span class="Operator">=</span> <span class="Identifier">Foo</span><span class="Punctuation">(</span><span class="Identifier">id</span><span class="Punctuation">:</span> <span class="DecNumber">1</span><span class="Punctuation">,</span> <span class="Identifier">bar</span><span class="Punctuation">:</span> <span class="StringLit">&quot;baz&quot;</span><span class="Punctuation">)</span>
  118. <span class="Comment">## serialize:</span>
  119. <span class="Keyword">let</span> <span class="Identifier">y</span> <span class="Operator">=</span> <span class="Operator">$$</span><span class="Identifier">x</span>
  120. <span class="Identifier">assert</span> <span class="Identifier">y</span> <span class="Operator">==</span> <span class="LongStringLit">&quot;&quot;&quot;{&quot;id&quot;: 1, &quot;bar&quot;: &quot;baz&quot;}&quot;&quot;&quot;</span></pre>
  121. <a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/marshal.nim#L317" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
  122. <a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/marshal.nim#L317" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
  123. </dd>
  124. </div>
  125. </div>
  126. <div id="load-procs-all">
  127. <div id="load,Stream,T">
  128. <dt><pre><span class="Keyword">proc</span> <a href="#load%2CStream%2CT"><span class="Identifier">load</span></a><span class="Other">[</span><span class="Identifier">T</span><span class="Other">]</span><span class="Other">(</span><span class="Identifier">s</span><span class="Other">:</span> <a href="streams.html#Stream"><span class="Identifier">Stream</span></a><span class="Other">;</span> <span class="Identifier">data</span><span class="Other">:</span> <span class="Keyword">var</span> <span class="Identifier">T</span><span class="Other">)</span></pre></dt>
  129. <dd>
  130. Loads <tt class="docutils literal"><span class="pre"><span class="Identifier">data</span></span></tt> from the stream <tt class="docutils literal"><span class="pre"><span class="Identifier">s</span></span></tt>. Raises <tt class="docutils literal"><span class="pre"><span class="Identifier">IOError</span></span></tt> in case of an error.
  131. <p><strong class="examples_text">Example:</strong></p>
  132. <pre class="listing"><span class="Keyword">import</span> <span class="Identifier">std</span><span class="Operator">/</span><span class="Identifier">streams</span>
  133. <span class="Keyword">var</span> <span class="Identifier">s</span> <span class="Operator">=</span> <span class="Identifier">newStringStream</span><span class="Punctuation">(</span><span class="StringLit">&quot;[1, 3, 5]&quot;</span><span class="Punctuation">)</span>
  134. <span class="Keyword">var</span> <span class="Identifier">a</span><span class="Punctuation">:</span> <span class="Identifier">array</span><span class="Punctuation">[</span><span class="DecNumber">3</span><span class="Punctuation">,</span> <span class="Identifier">int</span><span class="Punctuation">]</span>
  135. <span class="Identifier">load</span><span class="Punctuation">(</span><span class="Identifier">s</span><span class="Punctuation">,</span> <span class="Identifier">a</span><span class="Punctuation">)</span>
  136. <span class="Identifier">assert</span> <span class="Identifier">a</span> <span class="Operator">==</span> <span class="Punctuation">[</span><span class="DecNumber">1</span><span class="Punctuation">,</span> <span class="DecNumber">3</span><span class="Punctuation">,</span> <span class="DecNumber">5</span><span class="Punctuation">]</span></pre>
  137. <a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/marshal.nim#L282" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
  138. <a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/marshal.nim#L282" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
  139. </dd>
  140. </div>
  141. </div>
  142. <div id="store-procs-all">
  143. <div id="store,Stream,sinkT">
  144. <dt><pre><span class="Keyword">proc</span> <a href="#store%2CStream%2CsinkT"><span class="Identifier">store</span></a><span class="Other">[</span><span class="Identifier">T</span><span class="Other">]</span><span class="Other">(</span><span class="Identifier">s</span><span class="Other">:</span> <a href="streams.html#Stream"><span class="Identifier">Stream</span></a><span class="Other">;</span> <span class="Identifier">data</span><span class="Other">:</span> <a href="system.html#sink"><span class="Identifier">sink</span></a> <span class="Identifier">T</span><span class="Other">)</span></pre></dt>
  145. <dd>
  146. Stores <tt class="docutils literal"><span class="pre"><span class="Identifier">data</span></span></tt> into the stream <tt class="docutils literal"><span class="pre"><span class="Identifier">s</span></span></tt>. Raises <tt class="docutils literal"><span class="pre"><span class="Identifier">IOError</span></span></tt> in case of an error.
  147. <p><strong class="examples_text">Example:</strong></p>
  148. <pre class="listing"><span class="Keyword">import</span> <span class="Identifier">std</span><span class="Operator">/</span><span class="Identifier">streams</span>
  149. <span class="Keyword">var</span> <span class="Identifier">s</span> <span class="Operator">=</span> <span class="Identifier">newStringStream</span><span class="Punctuation">(</span><span class="StringLit">&quot;&quot;</span><span class="Punctuation">)</span>
  150. <span class="Keyword">var</span> <span class="Identifier">a</span> <span class="Operator">=</span> <span class="Punctuation">[</span><span class="DecNumber">1</span><span class="Punctuation">,</span> <span class="DecNumber">3</span><span class="Punctuation">,</span> <span class="DecNumber">5</span><span class="Punctuation">]</span>
  151. <span class="Identifier">store</span><span class="Punctuation">(</span><span class="Identifier">s</span><span class="Punctuation">,</span> <span class="Identifier">a</span><span class="Punctuation">)</span>
  152. <span class="Identifier">s</span><span class="Operator">.</span><span class="Identifier">setPosition</span><span class="Punctuation">(</span><span class="DecNumber">0</span><span class="Punctuation">)</span>
  153. <span class="Identifier">assert</span> <span class="Identifier">s</span><span class="Operator">.</span><span class="Identifier">readAll</span><span class="Punctuation">(</span><span class="Punctuation">)</span> <span class="Operator">==</span> <span class="StringLit">&quot;[1, 3, 5]&quot;</span></pre>
  154. <a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/marshal.nim#L295" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
  155. <a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/marshal.nim#L295" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
  156. </dd>
  157. </div>
  158. </div>
  159. <div id="to-procs-all">
  160. <div id="to,string">
  161. <dt><pre><span class="Keyword">proc</span> <a href="#to%2Cstring"><span class="Identifier">to</span></a><span class="Other">[</span><span class="Identifier">T</span><span class="Other">]</span><span class="Other">(</span><span class="Identifier">data</span><span class="Other">:</span> <a href="system.html#string"><span class="Identifier">string</span></a><span class="Other">)</span><span class="Other">:</span> <span class="Identifier">T</span></pre></dt>
  162. <dd>
  163. Reads data and transforms it to a type <tt class="docutils literal"><span class="pre"><span class="Identifier">T</span></span></tt> (deserialization, unmarshalling).
  164. <p><strong class="examples_text">Example:</strong></p>
  165. <pre class="listing"><span class="Keyword">type</span>
  166. <span class="Identifier">Foo</span> <span class="Operator">=</span> <span class="Keyword">object</span>
  167. <span class="Identifier">id</span><span class="Punctuation">:</span> <span class="Identifier">int</span>
  168. <span class="Identifier">bar</span><span class="Punctuation">:</span> <span class="Identifier">string</span>
  169. <span class="Keyword">let</span> <span class="Identifier">y</span> <span class="Operator">=</span> <span class="LongStringLit">&quot;&quot;&quot;{&quot;id&quot;: 1, &quot;bar&quot;: &quot;baz&quot;}&quot;&quot;&quot;</span>
  170. <span class="Identifier">assert</span> <span class="Identifier">typeof</span><span class="Punctuation">(</span><span class="Identifier">y</span><span class="Punctuation">)</span> <span class="Keyword">is</span> <span class="Identifier">string</span>
  171. <span class="Comment">## deserialize to type 'Foo':</span>
  172. <span class="Keyword">let</span> <span class="Identifier">z</span> <span class="Operator">=</span> <span class="Identifier">y</span><span class="Operator">.</span><span class="Identifier">to</span><span class="Punctuation">[</span><span class="Punctuation">:</span><span class="Identifier">Foo</span><span class="Punctuation">]</span>
  173. <span class="Identifier">assert</span> <span class="Identifier">typeof</span><span class="Punctuation">(</span><span class="Identifier">z</span><span class="Punctuation">)</span> <span class="Keyword">is</span> <span class="Identifier">Foo</span>
  174. <span class="Identifier">assert</span> <span class="Identifier">z</span><span class="Operator">.</span><span class="Identifier">id</span> <span class="Operator">==</span> <span class="DecNumber">1</span>
  175. <span class="Identifier">assert</span> <span class="Identifier">z</span><span class="Operator">.</span><span class="Identifier">bar</span> <span class="Operator">==</span> <span class="StringLit">&quot;baz&quot;</span></pre>
  176. <a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/marshal.nim#L348" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
  177. <a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/marshal.nim#L348" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
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