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File map (samples/extraction_pipeline/)
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The port tree (ABC contract)
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Generic default (Impl*)
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Bank variation (only what differs)
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Axis (banks/axis/pdf.py)
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Icici (banks/icici/pdf.py)
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Redundancy rule (applied in both banks)
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Container (build(cls) in hexa/container.py)
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Shared model
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1. parse_yaml(path) -&gt; PortNode
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2. generate_abc(path_yaml, out_path=None) -&gt; str
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3. parse_abc(module_or_path) -&gt; PortNode
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4. generate_yaml(module_or_path, out_path=None) -&gt; str
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5. check_matches(path_a, path_b) -&gt; bool
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Workflows (user's choice)
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<h1 id="hexa-design-extraction-pipeline-axisicici">hexa — Design (extraction pipeline, Axis/Icici)</h1>
<blockquote>
<p><strong>Note:</strong> The extraction pipeline discussed below is a sample/example illustrating the hexa composition pattern.</p>
</blockquote>
<p>This document is the concrete counterpart to <a href="../philosophy/">philosophy.md</a>: where
the files are, what the tree looks like for both banks, and how a future container
instantiates it. Self-sufficient for a fresh agent.</p>
<h2 id="file-map-samplesextraction_pipeline">File map (<code>samples/extraction_pipeline/</code>)</h2>
<table>
<thead>
<tr>
<th>File</th>
<th>Layer</th>
<th>Role</th>
</tr>
</thead>
<tbody>
<tr>
<td><code>extraction_pipeline_abc.py</code></td>
<td>ABC contracts</td>
<td>All port ABCs + <code>ExtractionPipeline</code> root. Declares attributes, the <code>ExtractionSource</code> dataclass, port slots, <code>@abstractmethod</code>s.</td>
</tr>
<tr>
<td><code>extraction_pipeline_impl.py</code></td>
<td>Generic <code>Impl*</code></td>
<td>Concrete default implementations of every port; <code>ImplExtractionPipeline</code> root; <code>clean_num</code> helper.</td>
</tr>
<tr>
<td><code>extraction_pipeline_ambiguity.py</code></td>
<td>Shared logic</td>
<td>Ported <code>ResolutionContext</code>, <code>AmbiguityHandler</code>, <code>AmountBalanceNotFound</code>, <code>validate_signs</code> — used by <code>ImplAmountBalancePort</code>.</td>
</tr>
<tr>
<td><code>extraction_pipeline_banks.py</code></td>
<td>Composition root</td>
<td><code>AxisExtractionPipeline(ImplExtractionPipeline)</code> + <code>IciciExtractionPipeline</code> (each re-pins <code>txn_dicts</code>).</td>
</tr>
<tr>
<td><code>banks/axis/pdf.py</code></td>
<td>Bank specialization</td>
<td><code>AxisNumberPort</code>, <code>AxisDescPort</code>, <code>AxisAmountBalancePort</code>, <code>AxisTransactionParserPort</code>, <code>AxisTxnDictsPort</code>.</td>
</tr>
<tr>
<td><code>banks/icici/pdf.py</code></td>
<td>Bank specialization</td>
<td><code>Icici*</code> mirror of the above + Icici-only <code>adjust_balance</code>/<code>missing_number_candidates</code>.</td>
</tr>
<tr>
<td><code>extraction_pipeline.yaml</code></td>
<td>Contract spec</td>
<td>Declarative spec of the port tree; interchangeable with <code>_abc.py</code> via the optional utilities.</td>
</tr>
</tbody>
</table>
<h2 id="the-port-tree-abc-contract">The port tree (ABC contract)</h2>
<div class="language-text highlight"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span></span><span class="normal"><a href="#__codelineno-0-1"> 1</a></span>
<span class="normal"><a href="#__codelineno-0-2"> 2</a></span>
<span class="normal"><a href="#__codelineno-0-3"> 3</a></span>
<span class="normal"><a href="#__codelineno-0-4"> 4</a></span>
<span class="normal"><a href="#__codelineno-0-5"> 5</a></span>
<span class="normal"><a href="#__codelineno-0-6"> 6</a></span>
<span class="normal"><a href="#__codelineno-0-7"> 7</a></span>
<span class="normal"><a href="#__codelineno-0-8"> 8</a></span>
<span class="normal"><a href="#__codelineno-0-9"> 9</a></span>
<span class="normal"><a href="#__codelineno-0-10">10</a></span>
<span class="normal"><a href="#__codelineno-0-11">11</a></span>
<span class="normal"><a href="#__codelineno-0-12">12</a></span>
<span class="normal"><a href="#__codelineno-0-13">13</a></span>
<span class="normal"><a href="#__codelineno-0-14">14</a></span>
<span class="normal"><a href="#__codelineno-0-15">15</a></span>
<span class="normal"><a href="#__codelineno-0-16">16</a></span></pre></div></td><td class="code"><div><pre><span></span><code><span id="__span-0-1"><a id="__codelineno-0-1" name="__codelineno-0-1"></a>ExtractionPipeline
</span><span id="__span-0-2"><a id="__codelineno-0-2" name="__codelineno-0-2"></a>├── source / pipeline / trust_fallback [attributes; source is a nested struct]
</span><span id="__span-0-3"><a id="__codelineno-0-3" name="__codelineno-0-3"></a>├── ingest → IngestPort (source → content)
</span><span id="__span-0-4"><a id="__codelineno-0-4" name="__codelineno-0-4"></a>├── raw_lines → RawLinesPort (content → raw_lines)
</span><span id="__span-0-5"><a id="__codelineno-0-5" name="__codelineno-0-5"></a>├── txn_blocks → TxnBlocksPort (raw_lines → txn_blocks)
</span><span id="__span-0-6"><a id="__codelineno-0-6" name="__codelineno-0-6"></a>│ ├── bucket_finder → BucketFinderPort
</span><span id="__span-0-7"><a id="__codelineno-0-7" name="__codelineno-0-7"></a>│ └── splitter → SplitterPort
</span><span id="__span-0-8"><a id="__codelineno-0-8" name="__codelineno-0-8"></a>├── txn_dicts → TxnDictsPort (txn_blocks → txn_dicts)
</span><span id="__span-0-9"><a id="__codelineno-0-9" name="__codelineno-0-9"></a>│ └── parser → TransactionParserPort
</span><span id="__span-0-10"><a id="__codelineno-0-10" name="__codelineno-0-10"></a>│ ├── number → NumberPort
</span><span id="__span-0-11"><a id="__codelineno-0-11" name="__codelineno-0-11"></a>│ ├── date → DatePort
</span><span id="__span-0-12"><a id="__codelineno-0-12" name="__codelineno-0-12"></a>│ ├── desc → DescPort
</span><span id="__span-0-13"><a id="__codelineno-0-13" name="__codelineno-0-13"></a>│ └── amount_balance → AmountBalancePort
</span><span id="__span-0-14"><a id="__codelineno-0-14" name="__codelineno-0-14"></a>│ ├── number → NumberPort
</span><span id="__span-0-15"><a id="__codelineno-0-15" name="__codelineno-0-15"></a>│ └── ambiguity → AmbiguityPort
</span><span id="__span-0-16"><a id="__codelineno-0-16" name="__codelineno-0-16"></a>└── raw_expense → RawExpensePort (txn_dicts → list[RawExpense], terminal)
</span></code></pre></div></td></tr></table></div>
<h2 id="generic-default-impl">Generic default (<code>Impl*</code>)</h2>
<p><code>ImplExtractionPipeline</code> pins every stage slot to a concrete <code>Impl*</code> port:</p>
<div class="language-text highlight"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span></span><span class="normal"><a href="#__codelineno-1-1"> 1</a></span>
<span class="normal"><a href="#__codelineno-1-2"> 2</a></span>
<span class="normal"><a href="#__codelineno-1-3"> 3</a></span>
<span class="normal"><a href="#__codelineno-1-4"> 4</a></span>
<span class="normal"><a href="#__codelineno-1-5"> 5</a></span>
<span class="normal"><a href="#__codelineno-1-6"> 6</a></span>
<span class="normal"><a href="#__codelineno-1-7"> 7</a></span>
<span class="normal"><a href="#__codelineno-1-8"> 8</a></span>
<span class="normal"><a href="#__codelineno-1-9"> 9</a></span>
<span class="normal"><a href="#__codelineno-1-10">10</a></span>
<span class="normal"><a href="#__codelineno-1-11">11</a></span>
<span class="normal"><a href="#__codelineno-1-12">12</a></span>
<span class="normal"><a href="#__codelineno-1-13">13</a></span>
<span class="normal"><a href="#__codelineno-1-14">14</a></span>
<span class="normal"><a href="#__codelineno-1-15">15</a></span></pre></div></td><td class="code"><div><pre><span></span><code><span id="__span-1-1"><a id="__codelineno-1-1" name="__codelineno-1-1"></a>ImplExtractionPipeline
</span><span id="__span-1-2"><a id="__codelineno-1-2" name="__codelineno-1-2"></a>├── ingest: ImplIngestPort
</span><span id="__span-1-3"><a id="__codelineno-1-3" name="__codelineno-1-3"></a>├── raw_lines: ImplRawLinesPort
</span><span id="__span-1-4"><a id="__codelineno-1-4" name="__codelineno-1-4"></a>├── txn_blocks: ImplTxnBlocksPort
</span><span id="__span-1-5"><a id="__codelineno-1-5" name="__codelineno-1-5"></a>│ ├── bucket_finder: ImplBucketFinderPort
</span><span id="__span-1-6"><a id="__codelineno-1-6" name="__codelineno-1-6"></a>│ └── splitter: ImplSplitterPort
</span><span id="__span-1-7"><a id="__codelineno-1-7" name="__codelineno-1-7"></a>├── txn_dicts: ImplTxnDictsPort
</span><span id="__span-1-8"><a id="__codelineno-1-8" name="__codelineno-1-8"></a>│ └── parser: ImplTransactionParserPort
</span><span id="__span-1-9"><a id="__codelineno-1-9" name="__codelineno-1-9"></a>│ ├── number: ImplNumberPort
</span><span id="__span-1-10"><a id="__codelineno-1-10" name="__codelineno-1-10"></a>│ ├── date: ImplDatePort
</span><span id="__span-1-11"><a id="__codelineno-1-11" name="__codelineno-1-11"></a>│ ├── desc: ImplDescPort
</span><span id="__span-1-12"><a id="__codelineno-1-12" name="__codelineno-1-12"></a>│ └── amount_balance: ImplAmountBalancePort
</span><span id="__span-1-13"><a id="__codelineno-1-13" name="__codelineno-1-13"></a>│ ├── number: ImplNumberPort
</span><span id="__span-1-14"><a id="__codelineno-1-14" name="__codelineno-1-14"></a>│ └── ambiguity: ImplAmbiguityPort
</span><span id="__span-1-15"><a id="__codelineno-1-15" name="__codelineno-1-15"></a>└── raw_expense: ImplRawExpensePort
</span></code></pre></div></td></tr></table></div>
<h2 id="bank-variation-only-what-differs">Bank variation (only what differs)</h2>
<p>The root class re-pins only <code>txn_dicts</code>. Everything else inherits <code>Impl*</code>.</p>
<h3 id="axis-banksaxispdfpy">Axis (<code>banks/axis/pdf.py</code>)</h3>
<div class="language-python highlight"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span></span><span class="normal"><a href="#__codelineno-2-1">1</a></span>
<span class="normal"><a href="#__codelineno-2-2">2</a></span></pre></div></td><td class="code"><div><pre><span></span><code><span id="__span-2-1"><a id="__codelineno-2-1" name="__codelineno-2-1"></a><span class="k">class</span><span class="w"> </span><span class="nc">AxisExtractionPipeline</span><span class="p">(</span><span class="n">ImplExtractionPipeline</span><span class="p">):</span>
</span><span id="__span-2-2"><a id="__codelineno-2-2" name="__codelineno-2-2"></a> <span class="n">txn_dicts</span><span class="p">:</span> <span class="n">AxisTxnDictsPort</span>
</span></code></pre></div></td></tr></table></div>
<div class="language-python highlight"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span></span><span class="normal"><a href="#__codelineno-3-1">1</a></span>
<span class="normal"><a href="#__codelineno-3-2">2</a></span>
<span class="normal"><a href="#__codelineno-3-3">3</a></span>
<span class="normal"><a href="#__codelineno-3-4">4</a></span>
<span class="normal"><a href="#__codelineno-3-5">5</a></span>
<span class="normal"><a href="#__codelineno-3-6">6</a></span></pre></div></td><td class="code"><div><pre><span></span><code><span id="__span-3-1"><a id="__codelineno-3-1" name="__codelineno-3-1"></a><span class="n">AxisTxnDictsPort</span><span class="p">(</span><span class="n">ImplTxnDictsPort</span><span class="p">)</span>
</span><span id="__span-3-2"><a id="__codelineno-3-2" name="__codelineno-3-2"></a> <span class="err">└─</span> <span class="n">parser</span><span class="p">:</span> <span class="n">AxisTransactionParserPort</span><span class="p">(</span><span class="n">ImplTransactionParserPort</span><span class="p">)</span>
</span><span id="__span-3-3"><a id="__codelineno-3-3" name="__codelineno-3-3"></a> <span class="err">├─</span> <span class="n">number</span><span class="p">:</span> <span class="n">AxisNumberPort</span> <span class="c1"># NUMBER_RE, all clean numbers</span>
</span><span id="__span-3-4"><a id="__codelineno-3-4" name="__codelineno-3-4"></a> <span class="err">├─</span> <span class="n">desc</span><span class="p">:</span> <span class="n">AxisDescPort</span> <span class="c1"># STARTTERS = [upi/, imps/, neft-, neft/, ach/, ach-, 2a/]</span>
</span><span id="__span-3-5"><a id="__codelineno-3-5" name="__codelineno-3-5"></a> <span class="err">└─</span> <span class="n">amount_balance</span><span class="p">:</span> <span class="n">AxisAmountBalancePort</span><span class="p">(</span><span class="n">ImplAmountBalancePort</span><span class="p">)</span>
</span><span id="__span-3-6"><a id="__codelineno-3-6" name="__codelineno-3-6"></a> <span class="err">└─</span> <span class="n">number</span><span class="p">:</span> <span class="n">AxisNumberPort</span> <span class="c1"># re-pin back to axis number port</span>
</span></code></pre></div></td></tr></table></div>
<p>Notes:
- <code>date</code> is <strong>not</strong> redeclared on <code>AxisTransactionParserPort</code> — it inherits
<code>ImplDatePort</code> (correct already, adds no behavior).
- <code>amount_balance.ambiguity</code> is not redeclared — inherits <code>ImplAmbiguityPort</code>.</p>
<h3 id="icici-banksicicipdfpy">Icici (<code>banks/icici/pdf.py</code>)</h3>
<div class="language-python highlight"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span></span><span class="normal"><a href="#__codelineno-4-1">1</a></span>
<span class="normal"><a href="#__codelineno-4-2">2</a></span></pre></div></td><td class="code"><div><pre><span></span><code><span id="__span-4-1"><a id="__codelineno-4-1" name="__codelineno-4-1"></a><span class="k">class</span><span class="w"> </span><span class="nc">IciciExtractionPipeline</span><span class="p">(</span><span class="n">ImplExtractionPipeline</span><span class="p">):</span>
</span><span id="__span-4-2"><a id="__codelineno-4-2" name="__codelineno-4-2"></a> <span class="n">txn_dicts</span><span class="p">:</span> <span class="n">IciciTxnDictsPort</span>
</span></code></pre></div></td></tr></table></div>
<div class="language-python highlight"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span></span><span class="normal"><a href="#__codelineno-5-1">1</a></span>
<span class="normal"><a href="#__codelineno-5-2">2</a></span>
<span class="normal"><a href="#__codelineno-5-3">3</a></span>
<span class="normal"><a href="#__codelineno-5-4">4</a></span>
<span class="normal"><a href="#__codelineno-5-5">5</a></span>
<span class="normal"><a href="#__codelineno-5-6">6</a></span>
<span class="normal"><a href="#__codelineno-5-7">7</a></span>
<span class="normal"><a href="#__codelineno-5-8">8</a></span></pre></div></td><td class="code"><div><pre><span></span><code><span id="__span-5-1"><a id="__codelineno-5-1" name="__codelineno-5-1"></a><span class="n">IciciTxnDictsPort</span><span class="p">(</span><span class="n">ImplTxnDictsPort</span><span class="p">)</span>
</span><span id="__span-5-2"><a id="__codelineno-5-2" name="__codelineno-5-2"></a> <span class="err">└─</span> <span class="n">parser</span><span class="p">:</span> <span class="n">IciciTransactionParserPort</span><span class="p">(</span><span class="n">ImplTransactionParserPort</span><span class="p">)</span>
</span><span id="__span-5-3"><a id="__codelineno-5-3" name="__codelineno-5-3"></a> <span class="err">├─</span> <span class="n">number</span><span class="p">:</span> <span class="n">IciciNumberPort</span> <span class="c1"># NUMBER_RE, returns decimals[-2:] (last 2)</span>
</span><span id="__span-5-4"><a id="__codelineno-5-4" name="__codelineno-5-4"></a> <span class="err">├─</span> <span class="n">desc</span><span class="p">:</span> <span class="n">IciciDescPort</span> <span class="c1"># STARTTERS + fix_ocr (UPl→UPI, ..., ICIC]→ICICI)</span>
</span><span id="__span-5-5"><a id="__codelineno-5-5" name="__codelineno-5-5"></a> <span class="err">└─</span> <span class="n">amount_balance</span><span class="p">:</span> <span class="n">IciciAmountBalancePort</span><span class="p">(</span><span class="n">ImplAmountBalancePort</span><span class="p">)</span>
</span><span id="__span-5-6"><a id="__codelineno-5-6" name="__codelineno-5-6"></a> <span class="err">├─</span> <span class="n">number</span><span class="p">:</span> <span class="n">IciciNumberPort</span> <span class="c1"># re-pin to icici number port</span>
</span><span id="__span-5-7"><a id="__codelineno-5-7" name="__codelineno-5-7"></a> <span class="err">├─</span> <span class="n">adjust_balance</span><span class="p">:</span> <span class="c1"># neg-markers [(-), (-}, {-}, {-) , ()] → -abs(balance)</span>
</span><span id="__span-5-8"><a id="__codelineno-5-8" name="__codelineno-5-8"></a> <span class="err">└─</span> <span class="n">missing_number_candidates</span><span class="p">:</span> <span class="c1"># Icici-only one-number hook</span>
</span></code></pre></div></td></tr></table></div>
<h2 id="redundancy-rule-applied-in-both-banks">Redundancy rule (applied in both banks)</h2>
<p>Only redeclare a slot you are actually <strong>changing</strong> from <code>Impl*</code>. If a slot's
behavior is already correct from the parent <code>Impl*</code>, <strong>omit it</strong>. This keeps the
diff between a bank and <code>Impl*</code> minimal and unambiguous.</p>
<blockquote>
<p><code>date: ImplDatePort</code> was previously redeclared redundantly and has been removed —
it added mental load on the extender for zero behavior change. (Fidelity audit:
it is still concrete <code>ImplDatePort</code> in <code>ImplTransactionParserPort</code>, so behavior is
unchanged.)</p>
</blockquote>
<h2 id="container-buildcls-in-hexacontainerpy">Container (<code>build(cls)</code> in <code>hexa/container.py</code>)</h2>
<p>The annotations are metadata; a small reflection builder turns a root class into
a wired instance:</p>
<div class="language-text highlight"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span></span><span class="normal"><a href="#__codelineno-6-1">1</a></span></pre></div></td><td class="code"><div><pre><span></span><code><span id="__span-6-1"><a id="__codelineno-6-1" name="__codelineno-6-1"></a>build(AxisExtractionPipeline) → wired AxisExtractionPipeline
</span></code></pre></div></td></tr></table></div>
<p>Algorithm (<code>build(cls)</code>):</p>
<ol>
<li>Walk <code>cls.__annotations__</code>, merged across the MRO so inherited slot annotations
are visible (a bank subclass only <em>adds/overrides</em> a slot; the rest come from
<code>Impl*</code>).</li>
<li>For each port slot whose annotated type is a concrete <code>Impl*</code>/bank class
(not an ABC, not a builtin), instantiate it.</li>
<li>Recurse into that child — repeat until leaves (classes that declare no further
port slots).</li>
<li><code>setattr(parent, slot, child)</code> to wire each slot onto the parent instance.</li>
<li>Apply config defaults from the class-level annotated attributes.</li>
</ol>
<p>Selection is <strong>fully static</strong>: the annotated type <em>is</em> the chosen implementation.
The container holds no per-bank branch logic — <code>Axis</code> vs <code>Icici</code> is decided purely by
which root class you call <code>build</code> on.</p>
<h3 id="control-flow-at-runtime-target">Control flow at runtime (target)</h3>
<p>A leaf-stage port exposes one entry method; stages chain data through the shared
<code>run(source)</code> signature on the root:</p>
<div class="language-text highlight"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span></span><span class="normal"><a href="#__codelineno-7-1">1</a></span>
<span class="normal"><a href="#__codelineno-7-2">2</a></span>
<span class="normal"><a href="#__codelineno-7-3">3</a></span>
<span class="normal"><a href="#__codelineno-7-4">4</a></span>
<span class="normal"><a href="#__codelineno-7-5">5</a></span>
<span class="normal"><a href="#__codelineno-7-6">6</a></span></pre></div></td><td class="code"><div><pre><span></span><code><span id="__span-7-1"><a id="__codelineno-7-1" name="__codelineno-7-1"></a>run(source)
</span><span id="__span-7-2"><a id="__codelineno-7-2" name="__codelineno-7-2"></a> ingest.materialize(source) → content
</span><span id="__span-7-3"><a id="__codelineno-7-3" name="__codelineno-7-3"></a> raw_lines.extract(content) → raw_lines
</span><span id="__span-7-4"><a id="__codelineno-7-4" name="__codelineno-7-4"></a> txn_blocks.extract(raw_lines) → {opening_balance: [blocks]}
</span><span id="__span-7-5"><a id="__codelineno-7-5" name="__codelineno-7-5"></a> txn_dicts.extract(txn_blocks) → [txn dicts]
</span><span id="__span-7-6"><a id="__codelineno-7-6" name="__codelineno-7-6"></a> raw_expense.build(txn_dicts) → [RawExpense] (terminal)
</span></code></pre></div></td></tr></table></div>
<p>The stage ports map naturally onto dagpipe <code>Node</code>s (<code>ingest</code>, <code>raw_lines</code>,
<code>txn_blocks</code>, <code>txn_dicts</code>, <code>raw_expense</code>), each node's <code>resolve</code> delegating to its
wired port subtree, connected as a dagpipe <code>Graph</code> and run via <code>Engine</code>. That merge
is a separate, future step.</p>
<h2 id="utilities-optional-hexa-agnostic">Utilities (optional, hexa-agnostic)</h2>
<p>The hexa utilities are implemented in <code>hexa/</code> (the package root) and they are <strong>agnostic of the extraction pipeline sample</strong>. It ships a set of <strong>optional</strong> code-gen / validation utilities so users can choose their own workflow — they are never required. A user is free to:</p>
<ul>
<li><strong>hand-write</strong> an ABC file and never touch YAML, or</li>
<li><strong>start from YAML</strong> and generate the ABC file, or</li>
<li><strong>start from an ABC file</strong> and emit YAML for it, or</li>
<li>use the ABC/YAML only as a <strong>spec</strong> (neither generated from the other).</li>
</ul>
<p>The utilities only ever translate between two interchangeable representations of
the same <em>contract</em> — the <code>.yaml</code> spec and the <code>_abc.py</code> module. They never
generate or manage the <code>Impl*</code>/bank files (those carry behavior and slot choice,
which is a human decision).</p>
<h3 id="shared-model">Shared model</h3>
<p>All utilities serialize through one neutral model, a <code>PortNode</code> tree. It is NOT
tied to the extraction sample — any port tree fits.</p>
<div class="language-python highlight"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span></span><span class="normal"><a href="#__codelineno-8-1">1</a></span>
<span class="normal"><a href="#__codelineno-8-2">2</a></span>
<span class="normal"><a href="#__codelineno-8-3">3</a></span>
<span class="normal"><a href="#__codelineno-8-4">4</a></span>
<span class="normal"><a href="#__codelineno-8-5">5</a></span>
<span class="normal"><a href="#__codelineno-8-6">6</a></span>
<span class="normal"><a href="#__codelineno-8-7">7</a></span>
<span class="normal"><a href="#__codelineno-8-8">8</a></span>
<span class="normal"><a href="#__codelineno-8-9">9</a></span></pre></div></td><td class="code"><div><pre><span></span><code><span id="__span-8-1"><a id="__codelineno-8-1" name="__codelineno-8-1"></a><span class="nd">@dataclass</span>
</span><span id="__span-8-2"><a id="__codelineno-8-2" name="__codelineno-8-2"></a><span class="k">class</span><span class="w"> </span><span class="nc">PortNode</span><span class="p">:</span>
</span><span id="__span-8-3"><a id="__codelineno-8-3" name="__codelineno-8-3"></a> <span class="n">name</span><span class="p">:</span> <span class="nb">str</span> <span class="c1"># slot name, e.g. &quot;parser&quot;, &quot;amount_balance&quot;</span>
</span><span id="__span-8-4"><a id="__codelineno-8-4" name="__codelineno-8-4"></a> <span class="n">kind</span><span class="p">:</span> <span class="nb">str</span> <span class="c1"># &quot;leaf&quot; | &quot;port&quot; | &quot;parent&quot;</span>
</span><span id="__span-8-5"><a id="__codelineno-8-5" name="__codelineno-8-5"></a> <span class="n">port_cls</span><span class="p">:</span> <span class="nb">str</span> <span class="c1"># ABC class name, e.g. &quot;TransactionParserPort&quot;</span>
</span><span id="__span-8-6"><a id="__codelineno-8-6" name="__codelineno-8-6"></a> <span class="n">attributes</span><span class="p">:</span> <span class="nb">dict</span><span class="p">[</span><span class="nb">str</span><span class="p">,</span> <span class="n">ConfigValue</span><span class="p">]</span> <span class="c1"># annotated attributes: name -&gt; type expr,</span>
</span><span id="__span-8-7"><a id="__codelineno-8-7" name="__codelineno-8-7"></a> <span class="c1"># or a nested struct dict for grouped values</span>
</span><span id="__span-8-8"><a id="__codelineno-8-8" name="__codelineno-8-8"></a> <span class="n">children</span><span class="p">:</span> <span class="nb">list</span><span class="p">[</span><span class="s2">&quot;PortNode&quot;</span><span class="p">]</span>
</span><span id="__span-8-9"><a id="__codelineno-8-9" name="__codelineno-8-9"></a> <span class="n">methods</span><span class="p">:</span> <span class="nb">dict</span><span class="p">[</span><span class="nb">str</span><span class="p">,</span> <span class="n">MethodSpec</span><span class="p">]</span> <span class="c1"># abstract methods</span>
</span></code></pre></div></td></tr></table></div>
<h3 id="1-parse_yamlpath-portnode">1. <code>parse_yaml(path) -&gt; PortNode</code></h3>
<p>Read a YAML spec into the <code>PortNode</code> tree (YAML → model).</p>
<ul>
<li>Parses completely (structural validation only, no type-checking).</li>
<li>Supports the sample grammar (see <code>extraction_pipeline.yaml</code>): a root class whose
inline attributes (scalars and nested structs), port slots, and reserved
<code>methods:</code> recurse into child ports.</li>
<li>Raises <code>ValueError</code> with file/line on structural errors.</li>
</ul>
<h3 id="2-generate_abcpath_yaml-out_pathnone-str">2. <code>generate_abc(path_yaml, out_path=None) -&gt; str</code></h3>
<p>Generate <code>_abc.py</code> source from a YAML spec (YAML <strong>→</strong> ABC).</p>
<ul>
<li><code>parse_yaml(...)</code> → write one <code>class &lt;PortCls&gt;(ABC)</code> per <code>PortNode</code> with
attribute annotations (nested structs become synthesized <code>@dataclass</code>es), port-slot
annotations, and <code>@abstractmethod</code> stubs, matching the style of the hand-written
<code>extraction_pipeline_abc.py</code>.</li>
<li>Deterministic (YAML-order) output so it is idempotent / diff-friendly.</li>
<li><code>out_path</code> optional; always returns the generated source.</li>
</ul>
<h3 id="3-parse_abcmodule_or_path-portnode">3. <code>parse_abc(module_or_path) -&gt; PortNode</code></h3>
<p>Reflect over an ABC module into the <code>PortNode</code> tree (ABC → model).</p>
<ul>
<li>Reads <code>__annotations__</code> / <code>@abstractmethod</code> from generic ABC classes (no
sample assumptions) to reconstruct the same <code>PortNode</code> tree.</li>
</ul>
<h3 id="4-generate_yamlmodule_or_path-out_pathnone-str">4. <code>generate_yaml(module_or_path, out_path=None) -&gt; str</code></h3>
<p>Generate a <code>.yaml</code> spec from an ABC module (ABC <strong>→</strong> YAML).</p>
<ul>
<li><code>parse_abc(...)</code> → write the reverse of <code>generate_abc</code>.</li>
<li>Lets a user author the ABC file first and emit YAML for it.</li>
</ul>
<h3 id="5-check_matchespath_a-path_b-bool">5. <code>check_matches(path_a, path_b) -&gt; bool</code></h3>
<p>Verify two representations agree — YAML vs ABC, either direction.</p>
<ul>
<li>Builds both <code>PortNode</code> models (<code>parse_yaml</code> + <code>parse_abc</code>) and compares: classes
exist and are <code>ABC</code>s, attributes match, port slots match, <code>@abstractmethod</code>
signatures match (missing keyword-only params treated conservatively).</li>
<li>Returns <code>True</code> only if the whole tree matches; otherwise <code>False</code> (or a diff).</li>
</ul>
<h3 id="workflows-users-choice">Workflows (user's choice)</h3>
<div class="language-text highlight"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span></span><span class="normal"><a href="#__codelineno-9-1"> 1</a></span>
<span class="normal"><a href="#__codelineno-9-2"> 2</a></span>
<span class="normal"><a href="#__codelineno-9-3"> 3</a></span>
<span class="normal"><a href="#__codelineno-9-4"> 4</a></span>
<span class="normal"><a href="#__codelineno-9-5"> 5</a></span>
<span class="normal"><a href="#__codelineno-9-6"> 6</a></span>
<span class="normal"><a href="#__codelineno-9-7"> 7</a></span>
<span class="normal"><a href="#__codelineno-9-8"> 8</a></span>
<span class="normal"><a href="#__codelineno-9-9"> 9</a></span>
<span class="normal"><a href="#__codelineno-9-10">10</a></span>
<span class="normal"><a href="#__codelineno-9-11">11</a></span>
<span class="normal"><a href="#__codelineno-9-12">12</a></span>
<span class="normal"><a href="#__codelineno-9-13">13</a></span></pre></div></td><td class="code"><div><pre><span></span><code><span id="__span-9-1"><a id="__codelineno-9-1" name="__codelineno-9-1"></a># YAML-first
</span><span id="__span-9-2"><a id="__codelineno-9-2" name="__codelineno-9-2"></a>edit spec.yaml
</span><span id="__span-9-3"><a id="__codelineno-9-3" name="__codelineno-9-3"></a> → generate_abc(spec.yaml, abc.py) # regenerate ABCs
</span><span id="__span-9-4"><a id="__codelineno-9-4" name="__codelineno-9-4"></a> → hand-write/update Impl* + banks
</span><span id="__span-9-5"><a id="__codelineno-9-5" name="__codelineno-9-5"></a> → check_matches(spec.yaml, abc.py) == True # guard
</span><span id="__span-9-6"><a id="__codelineno-9-6" name="__codelineno-9-6"></a>
</span><span id="__span-9-7"><a id="__codelineno-9-7" name="__codelineno-9-7"></a># ABC-first
</span><span id="__span-9-8"><a id="__codelineno-9-8" name="__codelineno-9-8"></a>edit abc.py
</span><span id="__span-9-9"><a id="__codelineno-9-9" name="__codelineno-9-9"></a> → generate_yaml(abc.py, spec.yaml) # emit YAML spec
</span><span id="__span-9-10"><a id="__codelineno-9-10" name="__codelineno-9-10"></a> → check_matches(spec.yaml, abc.py) == True
</span><span id="__span-9-11"><a id="__codelineno-9-11" name="__codelineno-9-11"></a>
</span><span id="__span-9-12"><a id="__codelineno-9-12" name="__codelineno-9-12"></a># hand-written both (no utilities at all)
</span><span id="__span-9-13"><a id="__codelineno-9-13" name="__codelineno-9-13"></a>edit abc.py + spec.yaml independently # optional check_matches as a guard
</span></code></pre></div></td></tr></table></div>
<p><code>Impl*</code>/bank files are always hand-extended on top and are never generated.</p>
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