Vishesh 'ironeagle' Bangotra
aedd2061e1
Adds the omniread wiki to the hub alongside lib and mcp and completes the library nav with csv/xlsx groups, picking up regenerated MCP modules.
714 lines
30 KiB
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714 lines
30 KiB
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Extending OmniRead
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🧬 Custom parsers
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🧬 Custom PDF parsers
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🧬 Custom clients
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🚀 Custom scrapers
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📚 Read Next
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Development
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<h1 id="extending-omniread">🧩 Extending OmniRead</h1>
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<p>OmniRead is meant to be extended by subclassing. All public extension points
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are generic over their result type, so your parser returns exactly the shape
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you need.</p>
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<hr />
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<h2 id="custom-parsers">🧬 Custom parsers</h2>
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<p>Subclass <code>BaseParser[T]</code> (or a format parser) and implement <code>parse()</code>:</p>
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<div class="language-python 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>
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<span class="normal"><a href="#__codelineno-0-2"> 2</a></span>
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<span class="normal"><a href="#__codelineno-0-3"> 3</a></span>
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<span class="normal"><a href="#__codelineno-0-4"> 4</a></span>
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<span class="normal"><a href="#__codelineno-0-5"> 5</a></span>
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<span class="normal"><a href="#__codelineno-0-6"> 6</a></span>
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<span class="normal"><a href="#__codelineno-0-7"> 7</a></span>
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<span class="normal"><a href="#__codelineno-0-8"> 8</a></span>
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<span class="normal"><a href="#__codelineno-0-9"> 9</a></span>
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<span class="normal"><a href="#__codelineno-0-10">10</a></span>
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<span class="normal"><a href="#__codelineno-0-11">11</a></span>
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<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></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><span class="kn">from</span><span class="w"> </span><span class="nn">pydantic</span><span class="w"> </span><span class="kn">import</span> <span class="n">BaseModel</span>
|
|
</span><span id="__span-0-2"><a id="__codelineno-0-2" name="__codelineno-0-2"></a><span class="kn">from</span><span class="w"> </span><span class="nn">omniread</span><span class="w"> </span><span class="kn">import</span> <span class="n">HTMLParser</span>
|
|
</span><span id="__span-0-3"><a id="__codelineno-0-3" name="__codelineno-0-3"></a>
|
|
</span><span id="__span-0-4"><a id="__codelineno-0-4" name="__codelineno-0-4"></a><span class="k">class</span><span class="w"> </span><span class="nc">Page</span><span class="p">(</span><span class="n">BaseModel</span><span class="p">):</span>
|
|
</span><span id="__span-0-5"><a id="__codelineno-0-5" name="__codelineno-0-5"></a> <span class="n">title</span><span class="p">:</span> <span class="nb">str</span>
|
|
</span><span id="__span-0-6"><a id="__codelineno-0-6" name="__codelineno-0-6"></a> <span class="n">content</span><span class="p">:</span> <span class="nb">str</span> <span class="o">|</span> <span class="kc">None</span>
|
|
</span><span id="__span-0-7"><a id="__codelineno-0-7" name="__codelineno-0-7"></a>
|
|
</span><span id="__span-0-8"><a id="__codelineno-0-8" name="__codelineno-0-8"></a><span class="k">class</span><span class="w"> </span><span class="nc">PageParser</span><span class="p">(</span><span class="n">HTMLParser</span><span class="p">[</span><span class="n">Page</span><span class="p">]):</span>
|
|
</span><span id="__span-0-9"><a id="__codelineno-0-9" name="__codelineno-0-9"></a> <span class="k">def</span><span class="w"> </span><span class="nf">parse</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span> <span class="o">-></span> <span class="n">Page</span><span class="p">:</span>
|
|
</span><span id="__span-0-10"><a id="__codelineno-0-10" name="__codelineno-0-10"></a> <span class="n">soup</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_soup</span>
|
|
</span><span id="__span-0-11"><a id="__codelineno-0-11" name="__codelineno-0-11"></a> <span class="n">div</span> <span class="o">=</span> <span class="n">soup</span><span class="o">.</span><span class="n">find</span><span class="p">(</span><span class="s2">"div"</span><span class="p">,</span> <span class="nb">id</span><span class="o">=</span><span class="s2">"content"</span><span class="p">)</span>
|
|
</span><span id="__span-0-12"><a id="__codelineno-0-12" name="__codelineno-0-12"></a> <span class="k">return</span> <span class="n">Page</span><span class="p">(</span>
|
|
</span><span id="__span-0-13"><a id="__codelineno-0-13" name="__codelineno-0-13"></a> <span class="n">title</span><span class="o">=</span><span class="n">soup</span><span class="o">.</span><span class="n">title</span><span class="o">.</span><span class="n">string</span><span class="p">,</span>
|
|
</span><span id="__span-0-14"><a id="__codelineno-0-14" name="__codelineno-0-14"></a> <span class="n">content</span><span class="o">=</span><span class="n">div</span><span class="o">.</span><span class="n">get_text</span><span class="p">()</span> <span class="k">if</span> <span class="n">div</span> <span class="k">else</span> <span class="kc">None</span><span class="p">,</span>
|
|
</span><span id="__span-0-15"><a id="__codelineno-0-15" name="__codelineno-0-15"></a> <span class="p">)</span>
|
|
</span></code></pre></div></td></tr></table></div>
|
|
<p>The parsed page is validated by Pydantic on construction — no manual
|
|
assertions required.</p>
|
|
<hr />
|
|
<h2 id="custom-pdf-parsers">🧬 Custom PDF parsers</h2>
|
|
<p>PDF binary layout is format-specific, so parsers return your own model:</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-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></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><span class="kn">from</span><span class="w"> </span><span class="nn">typing</span><span class="w"> </span><span class="kn">import</span> <span class="n">Literal</span>
|
|
</span><span id="__span-1-2"><a id="__codelineno-1-2" name="__codelineno-1-2"></a><span class="kn">from</span><span class="w"> </span><span class="nn">pydantic</span><span class="w"> </span><span class="kn">import</span> <span class="n">BaseModel</span>
|
|
</span><span id="__span-1-3"><a id="__codelineno-1-3" name="__codelineno-1-3"></a><span class="kn">from</span><span class="w"> </span><span class="nn">omniread</span><span class="w"> </span><span class="kn">import</span> <span class="n">PDFParser</span>
|
|
</span><span id="__span-1-4"><a id="__codelineno-1-4" name="__codelineno-1-4"></a>
|
|
</span><span id="__span-1-5"><a id="__codelineno-1-5" name="__codelineno-1-5"></a><span class="k">class</span><span class="w"> </span><span class="nc">ParsedPDF</span><span class="p">(</span><span class="n">BaseModel</span><span class="p">):</span>
|
|
</span><span id="__span-1-6"><a id="__codelineno-1-6" name="__codelineno-1-6"></a> <span class="n">size_bytes</span><span class="p">:</span> <span class="nb">int</span>
|
|
</span><span id="__span-1-7"><a id="__codelineno-1-7" name="__codelineno-1-7"></a> <span class="n">magic</span><span class="p">:</span> <span class="n">Literal</span><span class="p">[</span><span class="sa">b</span><span class="s2">"%PDF"</span><span class="p">]</span>
|
|
</span><span id="__span-1-8"><a id="__codelineno-1-8" name="__codelineno-1-8"></a>
|
|
</span><span id="__span-1-9"><a id="__codelineno-1-9" name="__codelineno-1-9"></a><span class="k">class</span><span class="w"> </span><span class="nc">SimplePDFParser</span><span class="p">(</span><span class="n">PDFParser</span><span class="p">[</span><span class="n">ParsedPDF</span><span class="p">]):</span>
|
|
</span><span id="__span-1-10"><a id="__codelineno-1-10" name="__codelineno-1-10"></a> <span class="k">def</span><span class="w"> </span><span class="nf">parse</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span> <span class="o">-></span> <span class="n">ParsedPDF</span><span class="p">:</span>
|
|
</span><span id="__span-1-11"><a id="__codelineno-1-11" name="__codelineno-1-11"></a> <span class="k">if</span> <span class="ow">not</span> <span class="bp">self</span><span class="o">.</span><span class="n">content</span><span class="o">.</span><span class="n">raw</span><span class="o">.</span><span class="n">startswith</span><span class="p">(</span><span class="sa">b</span><span class="s2">"%PDF"</span><span class="p">):</span>
|
|
</span><span id="__span-1-12"><a id="__codelineno-1-12" name="__codelineno-1-12"></a> <span class="k">raise</span> <span class="ne">ValueError</span><span class="p">(</span><span class="s2">"Not a valid PDF"</span><span class="p">)</span>
|
|
</span><span id="__span-1-13"><a id="__codelineno-1-13" name="__codelineno-1-13"></a> <span class="k">return</span> <span class="n">ParsedPDF</span><span class="p">(</span><span class="n">size_bytes</span><span class="o">=</span><span class="nb">len</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">content</span><span class="o">.</span><span class="n">raw</span><span class="p">),</span> <span class="n">magic</span><span class="o">=</span><span class="sa">b</span><span class="s2">"%PDF"</span><span class="p">)</span>
|
|
</span></code></pre></div></td></tr></table></div>
|
|
<hr />
|
|
<h2 id="custom-clients">🧬 Custom clients</h2>
|
|
<p>Clients supply raw bytes to a scraper. For PDFs, subclass
|
|
<code>BasePDFClient</code> (or <code>FileSystemPDFClient</code>) and implement
|
|
<code>fetch(source) -> bytes</code>:</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-2-1">1</a></span>
|
|
<span class="normal"><a href="#__codelineno-2-2">2</a></span>
|
|
<span class="normal"><a href="#__codelineno-2-3">3</a></span>
|
|
<span class="normal"><a href="#__codelineno-2-4">4</a></span>
|
|
<span class="normal"><a href="#__codelineno-2-5">5</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="kn">from</span><span class="w"> </span><span class="nn">omniread.pdf.client</span><span class="w"> </span><span class="kn">import</span> <span class="n">BasePDFClient</span>
|
|
</span><span id="__span-2-2"><a id="__codelineno-2-2" name="__codelineno-2-2"></a>
|
|
</span><span id="__span-2-3"><a id="__codelineno-2-3" name="__codelineno-2-3"></a><span class="k">class</span><span class="w"> </span><span class="nc">MockPDFClient</span><span class="p">(</span><span class="n">BasePDFClient</span><span class="p">):</span>
|
|
</span><span id="__span-2-4"><a id="__codelineno-2-4" name="__codelineno-2-4"></a> <span class="k">def</span><span class="w"> </span><span class="nf">fetch</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">source</span><span class="p">):</span>
|
|
</span><span id="__span-2-5"><a id="__codelineno-2-5" name="__codelineno-2-5"></a> <span class="k">return</span> <span class="sa">b</span><span class="s2">"%PDF ..."</span> <span class="c1"># bytes for the logical identifier</span>
|
|
</span></code></pre></div></td></tr></table></div>
|
|
<p>The same pattern applies to <code>BaseCsvClient</code> and <code>BaseXlsxClient</code>.</p>
|
|
<hr />
|
|
<h2 id="custom-scrapers">🚀 Custom scrapers</h2>
|
|
<p>Festch something that a built-in scraper does not cover by extending
|
|
<code>BaseScraper</code>:</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-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="kn">from</span><span class="w"> </span><span class="nn">omniread</span><span class="w"> </span><span class="kn">import</span> <span class="n">BaseScraper</span><span class="p">,</span> <span class="n">Content</span><span class="p">,</span> <span class="n">ContentType</span>
|
|
</span><span id="__span-3-2"><a id="__codelineno-3-2" name="__codelineno-3-2"></a>
|
|
</span><span id="__span-3-3"><a id="__codelineno-3-3" name="__codelineno-3-3"></a><span class="k">class</span><span class="w"> </span><span class="nc">StorageScraper</span><span class="p">(</span><span class="n">BaseScraper</span><span class="p">):</span>
|
|
</span><span id="__span-3-4"><a id="__codelineno-3-4" name="__codelineno-3-4"></a> <span class="k">def</span><span class="w"> </span><span class="nf">fetch</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">source</span><span class="p">,</span> <span class="o">*</span><span class="p">,</span> <span class="n">metadata</span><span class="o">=</span><span class="kc">None</span><span class="p">):</span>
|
|
</span><span id="__span-3-5"><a id="__codelineno-3-5" name="__codelineno-3-5"></a> <span class="n">raw</span> <span class="o">=</span> <span class="n">my_object_storage</span><span class="o">.</span><span class="n">download</span><span class="p">(</span><span class="n">source</span><span class="p">)</span> <span class="c1"># your I/O</span>
|
|
</span><span id="__span-3-6"><a id="__codelineno-3-6" name="__codelineno-3-6"></a> <span class="k">return</span> <span class="n">Content</span><span class="p">(</span><span class="n">raw</span><span class="o">=</span><span class="n">raw</span><span class="p">,</span> <span class="n">source</span><span class="o">=</span><span class="n">source</span><span class="p">,</span> <span class="n">content_type</span><span class="o">=</span><span class="n">ContentType</span><span class="o">.</span><span class="n">JSON</span><span class="p">)</span>
|
|
</span></code></pre></div></td></tr></table></div>
|
|
<hr />
|
|
<h2 id="extension-checklist">✅ Extension checklist</h2>
|
|
<ol>
|
|
<li>Keep <strong>scraper</strong> and <strong>parser</strong> separate — never mix I/O into <code>parse()</code>.</li>
|
|
<li>Return <code>Content</code> from any scraper/client so downstream stays uniform.</li>
|
|
<li>Return a <em>typed</em> result from your parser (Pydantic model, dataclass, str).</li>
|
|
<li>Test your custom layers with a mock client, not a live network.</li>
|
|
</ol>
|
|
<hr />
|
|
<h2 id="read-next">📚 Read Next</h2>
|
|
<ul>
|
|
<li><a href="../02_how_to_use/">How to Use</a> — built-in example flows.</li>
|
|
<li><a href="../04_development/">Development</a> — running tests and docs.</li>
|
|
</ul>
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