1088 lines
29 KiB
HTML
1088 lines
29 KiB
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<link rel="prev" href="../01_yaml_first/">
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Hexa Documentation
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ABC First
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Initializing search
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<li class="md-tabs__item">
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<a href="../../01_overview/" class="md-tabs__link">
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Overview
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</a>
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<li class="md-tabs__item">
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Core Components
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</a>
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<li class="md-tabs__item md-tabs__item--active">
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<a href="../01_yaml_first/" class="md-tabs__link">
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Use Cases
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</a>
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</li>
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<li class="md-tabs__item">
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<a href="../../04_design/" class="md-tabs__link">
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Design
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</a>
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<li class="md-tabs__item">
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<a href="../../05_philosophy/" class="md-tabs__link">
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Philosophy
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</a>
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<li class="md-tabs__item">
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<a href="../../06_best_practices/" class="md-tabs__link">
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Best Practices
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</a>
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<li class="md-tabs__item">
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<a href="../../07_error_handling/" class="md-tabs__link">
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Error Handling
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</a>
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</li>
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<li class="md-tabs__item">
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<a href="../../08_testing_example/" class="md-tabs__link">
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Testing
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</a>
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<nav class="md-nav md-nav--primary md-nav--lifted md-nav--integrated" aria-label="Navigation" data-md-level="0">
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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M10.25 2c.19 0 .36.11.44.26l2.22 3.96.09.28-.09.28-2.22 3.96c-.08.15-.25.26-.44.26h-4.5c-.19 0-.36-.11-.44-.26L3.09 6.78 3 6.5l.09-.28 2.22-3.96c.08-.15.25-.26.44-.26zm0 11c.19 0 .36.11.44.26l2.22 3.96.09.28-.09.28-2.22 3.96c-.08.15-.25.26-.44.26h-4.5c-.19 0-.36-.11-.44-.26l-2.22-3.96L3 17.5l.09-.28 2.22-3.96c.08-.15.25-.26.44-.26zm9.25-5.5c.19 0 .36.11.44.26l2.22 3.96.09.28-.09.28-2.22 3.96c-.08.15-.25.26-.44.26H15c-.19 0-.36-.11-.44-.26l-2.22-3.96-.09-.28.09-.28 2.22-3.96c.08-.15.25-.26.44-.26z"/></svg>
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Hexa Documentation
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Overview
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Core Components
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</a>
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<li class="md-nav__item md-nav__item--active md-nav__item--section md-nav__item--nested">
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<span class="md-ellipsis">
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Use Cases
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</span>
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</label>
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<nav class="md-nav" data-md-level="1" aria-labelledby="__nav_4_label" aria-expanded="true">
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<label class="md-nav__title" for="__nav_4">
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Use Cases
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<li class="md-nav__item md-nav__item--active md-nav__item--section md-nav__item--nested">
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<label class="md-nav__link" for="__nav_4_1" id="__nav_4_1_label" tabindex="">
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<span class="md-ellipsis">
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Contract Authoring
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</span>
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<span class="md-nav__icon md-icon"></span>
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</label>
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<nav class="md-nav" data-md-level="2" aria-labelledby="__nav_4_1_label" aria-expanded="true">
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<label class="md-nav__title" for="__nav_4_1">
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<span class="md-nav__icon md-icon"></span>
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Contract Authoring
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</label>
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<ul class="md-nav__list" data-md-scrollfix>
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<li class="md-nav__item">
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<a href="../01_yaml_first/" class="md-nav__link">
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<span class="md-ellipsis">
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YAML First
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</span>
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</a>
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</li>
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<li class="md-nav__item md-nav__item--active">
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<span class="md-ellipsis">
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ABC First
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<h1 id="use-case-2-abc-first-contract-authoring">Use Case 2: ABC-First Contract Authoring<a class="headerlink" href="#use-case-2-abc-first-contract-authoring" title="Permanent link">¶</a></h1>
|
||
<p><strong>Scenario:</strong> you prefer to author contracts as Python ABC modules, then emit — and verify — a YAML spec for them.</p>
|
||
<hr />
|
||
<h2 id="whats-new">📦 What's New?<a class="headerlink" href="#whats-new" title="Permanent link">¶</a></h2>
|
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<table>
|
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<thead>
|
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<tr>
|
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<th>Component</th>
|
||
<th>Description</th>
|
||
</tr>
|
||
</thead>
|
||
<tbody>
|
||
<tr>
|
||
<td><code>parse_abc</code></td>
|
||
<td>Reflects an ABC module into the neutral <code>PortNode</code> tree.</td>
|
||
</tr>
|
||
<tr>
|
||
<td><code>generate_yaml</code></td>
|
||
<td>Emits a YAML spec from the tree.</td>
|
||
</tr>
|
||
<tr>
|
||
<td><code>check_matches</code></td>
|
||
<td>Verifies the two representations agree (reverse direction).</td>
|
||
</tr>
|
||
</tbody>
|
||
</table>
|
||
<hr />
|
||
<h2 id="example">🚀 Example<a class="headerlink" href="#example" title="Permanent link">¶</a></h2>
|
||
<p>Author the contract in Python (see <code>samples/minimal/abc.py</code>). A nested-struct attribute is expressed as a <code>@dataclass</code> annotation on an ABC port; the dataclass fields expand into a nested <code>attributes</code> entry when parsed:</p>
|
||
<div class="language-python highlight"><span class="filename">Python</span><pre><span></span><code><a id="__codelineno-0-1" name="__codelineno-0-1" href="#__codelineno-0-1"></a><span class="kn">from</span><span class="w"> </span><span class="nn">abc</span><span class="w"> </span><span class="kn">import</span> <span class="n">ABC</span><span class="p">,</span> <span class="n">abstractmethod</span>
|
||
<a id="__codelineno-0-2" name="__codelineno-0-2" href="#__codelineno-0-2"></a>
|
||
<a id="__codelineno-0-3" name="__codelineno-0-3" href="#__codelineno-0-3"></a>
|
||
<a id="__codelineno-0-4" name="__codelineno-0-4" href="#__codelineno-0-4"></a><span class="k">class</span><span class="w"> </span><span class="nc">NonHexaPort1</span><span class="p">(</span><span class="n">ABC</span><span class="p">):</span>
|
||
<a id="__codelineno-0-5" name="__codelineno-0-5" href="#__codelineno-0-5"></a> <span class="n">config_var11</span><span class="p">:</span> <span class="nb">str</span>
|
||
<a id="__codelineno-0-6" name="__codelineno-0-6" href="#__codelineno-0-6"></a> <span class="n">config_var12</span><span class="p">:</span> <span class="nb">int</span>
|
||
<a id="__codelineno-0-7" name="__codelineno-0-7" href="#__codelineno-0-7"></a>
|
||
<a id="__codelineno-0-8" name="__codelineno-0-8" href="#__codelineno-0-8"></a> <span class="nd">@abstractmethod</span>
|
||
<a id="__codelineno-0-9" name="__codelineno-0-9" href="#__codelineno-0-9"></a> <span class="k">def</span><span class="w"> </span><span class="nf">method1</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">arg1</span><span class="p">,</span> <span class="n">arg2</span><span class="p">,</span> <span class="o">*</span><span class="p">,</span> <span class="n">kwarg1</span><span class="p">:</span> <span class="nb">int</span> <span class="o">=</span> <span class="mi">0</span><span class="p">,</span> <span class="n">kwarg2</span><span class="p">:</span> <span class="nb">str</span> <span class="o">=</span> <span class="s2">""</span><span class="p">)</span> <span class="o">-></span> <span class="nb">str</span><span class="p">:</span> <span class="o">...</span>
|
||
<a id="__codelineno-0-10" name="__codelineno-0-10" href="#__codelineno-0-10"></a>
|
||
<a id="__codelineno-0-11" name="__codelineno-0-11" href="#__codelineno-0-11"></a>
|
||
<a id="__codelineno-0-12" name="__codelineno-0-12" href="#__codelineno-0-12"></a><span class="k">class</span><span class="w"> </span><span class="nc">ParentClass</span><span class="p">(</span><span class="n">ABC</span><span class="p">):</span>
|
||
<a id="__codelineno-0-13" name="__codelineno-0-13" href="#__codelineno-0-13"></a> <span class="n">config_var1</span><span class="p">:</span> <span class="nb">str</span>
|
||
<a id="__codelineno-0-14" name="__codelineno-0-14" href="#__codelineno-0-14"></a> <span class="n">config_var2</span><span class="p">:</span> <span class="nb">int</span>
|
||
<a id="__codelineno-0-15" name="__codelineno-0-15" href="#__codelineno-0-15"></a>
|
||
<a id="__codelineno-0-16" name="__codelineno-0-16" href="#__codelineno-0-16"></a> <span class="n">port1</span><span class="p">:</span> <span class="n">NonHexaChildClass1</span>
|
||
<a id="__codelineno-0-17" name="__codelineno-0-17" href="#__codelineno-0-17"></a> <span class="n">port2</span><span class="p">:</span> <span class="n">HexaChildClass2</span>
|
||
<a id="__codelineno-0-18" name="__codelineno-0-18" href="#__codelineno-0-18"></a> <span class="n">port3</span><span class="p">:</span> <span class="n">HexaChildClass3</span>
|
||
<a id="__codelineno-0-19" name="__codelineno-0-19" href="#__codelineno-0-19"></a>
|
||
<a id="__codelineno-0-20" name="__codelineno-0-20" href="#__codelineno-0-20"></a> <span class="nd">@abstractmethod</span>
|
||
<a id="__codelineno-0-21" name="__codelineno-0-21" href="#__codelineno-0-21"></a> <span class="k">def</span><span class="w"> </span><span class="nf">run</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">arg1</span><span class="p">,</span> <span class="n">arg2</span><span class="p">,</span> <span class="o">*</span><span class="p">,</span> <span class="n">kwarg1</span><span class="p">:</span> <span class="nb">int</span> <span class="o">=</span> <span class="mi">0</span><span class="p">,</span> <span class="n">kwarg2</span><span class="p">:</span> <span class="nb">str</span> <span class="o">=</span> <span class="s2">""</span><span class="p">)</span> <span class="o">-></span> <span class="nb">dict</span><span class="p">:</span> <span class="o">...</span>
|
||
</code></pre></div>
|
||
<p>Emit the YAML spec from the module:</p>
|
||
<div class="language-bash highlight"><span class="filename">Bash</span><pre><span></span><code><a id="__codelineno-1-1" name="__codelineno-1-1" href="#__codelineno-1-1"></a>hexa<span class="w"> </span>generate-yaml<span class="w"> </span>samples/minimal/abc.py<span class="w"> </span>--out<span class="w"> </span>spec.yaml
|
||
</code></pre></div>
|
||
<p>Inspect the parsed tree to make sure the root was detected correctly:</p>
|
||
<div class="language-bash highlight"><span class="filename">Bash</span><pre><span></span><code><a id="__codelineno-2-1" name="__codelineno-2-1" href="#__codelineno-2-1"></a>hexa<span class="w"> </span>parse-abc<span class="w"> </span>samples/minimal/abc.py
|
||
<a id="__codelineno-2-2" name="__codelineno-2-2" href="#__codelineno-2-2"></a><span class="c1"># PortNode(name='ParentClass', port_cls='ParentClass', kind='parent', ...)</span>
|
||
</code></pre></div>
|
||
<p>And verify the spec against the module:</p>
|
||
<div class="language-bash highlight"><span class="filename">Bash</span><pre><span></span><code><a id="__codelineno-3-1" name="__codelineno-3-1" href="#__codelineno-3-1"></a>hexa<span class="w"> </span>check<span class="w"> </span>spec.yaml<span class="w"> </span>samples/minimal/abc.py
|
||
<a id="__codelineno-3-2" name="__codelineno-3-2" href="#__codelineno-3-2"></a><span class="c1"># Matches. (exit 0)</span>
|
||
</code></pre></div>
|
||
<hr />
|
||
<h2 id="tips">💡 Tips<a class="headerlink" href="#tips" title="Permanent link">¶</a></h2>
|
||
<ul>
|
||
<li>Root detection: <code>parse_abc</code> picks the class that is <strong>not referenced as any other slot</strong>; on ties it prefers names containing <code>Pipeline</code>, <code>Root</code>, or <code>Parent</code>.</li>
|
||
<li><code>parse_abc</code> accepts a <code>.py</code> path, an import string (e.g. <code>samples.minimal.abc</code>), or an already-loaded module, so it composes well in scripts.</li>
|
||
<li>A <code>@dataclass</code> referenced from a port becomes a nested struct; a dataclass field that references an ABC becomes a nested port slot keyed under the struct.</li>
|
||
<li>YAML generated this way is exactly the grammar <code>parse_yaml</code> understands — the two directions round-trip (<code>node1.diff(node3) == []</code> in the repo's roundtrip tests).</li>
|
||
</ul>
|
||
<hr />
|
||
<h2 id="related">Related<a class="headerlink" href="#related" title="Permanent link">¶</a></h2>
|
||
<ul>
|
||
<li><a href="../01_yaml_first/">01 – YAML first</a> · <a href="../03_wiring_runtime/">03 – Wiring & runtime</a> · <a href="../../02_components/">Core Components</a></li>
|
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