855 lines
35 KiB
HTML
855 lines
35 KiB
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Python Preserves
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Merging values
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The top-level preserves package
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Machine-oriented binary syntax
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Comparing Values
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</a>
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Traversing values
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</a>
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<span class="md-ellipsis">
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Merging values
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</span>
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<span class="md-ellipsis">
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Merging values
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</a>
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<nav class="md-nav md-nav--secondary" aria-label="Table of contents">
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Table of contents
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<li class="md-nav__item">
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<a href="#preserves.merge" class="md-nav__link">
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merge
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<li class="md-nav__item">
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<a href="#preserves.merge.merge" class="md-nav__link">
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merge()
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</a>
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</li>
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<li class="md-nav__item">
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<a href="#preserves.merge.merge2" class="md-nav__link">
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merge2()
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</nav>
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Preserves Path
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</a>
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<a href="../schema/" class="md-nav__link">
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<span class="md-ellipsis">
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Preserves Schema
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</span>
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</a>
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<a href="../text/" class="md-nav__link">
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<span class="md-ellipsis">
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Human-readable text syntax
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</a>
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<a href="../values/" class="md-nav__link">
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<span class="md-ellipsis">
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Representations of Values
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</span>
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</a>
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Table of contents
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<ul class="md-nav__list" data-md-component="toc" data-md-scrollfix>
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<li class="md-nav__item">
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<a href="#preserves.merge" class="md-nav__link">
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merge
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</a>
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</li>
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<li class="md-nav__item">
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<a href="#preserves.merge.merge" class="md-nav__link">
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merge()
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</a>
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</li>
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<li class="md-nav__item">
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<a href="#preserves.merge.merge2" class="md-nav__link">
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merge2()
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</a>
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</li>
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</ul>
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</nav>
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<article class="md-content__inner md-typeset">
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<h1 id="merging-values">Merging values</h1>
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<div class="doc doc-object doc-module">
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<a id="preserves.merge"></a>
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<div class="doc doc-contents first">
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<p>The <a class="autorefs autorefs-internal" href="#preserves.merge">preserves.merge</a> module exports various utilities for merging <code>Value</code>s.</p>
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<div class="doc doc-children">
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<div class="doc doc-object doc-function">
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<h2 id="preserves.merge.merge" class="doc doc-heading">
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<code class="highlight language-python"><span class="n">merge</span><span class="p">(</span><span class="n">v0</span><span class="p">,</span> <span class="o">*</span><span class="n">vs</span><span class="p">,</span> <span class="n">merge_embedded</span><span class="o">=</span><span class="kc">None</span><span class="p">)</span></code>
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</h2>
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<div class="doc doc-contents ">
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<p>Repeatedly merges <code>v0</code> with each element in <code>vs</code> using <a class="autorefs autorefs-internal" href="#preserves.merge.merge2">merge2</a>,
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returning the final result. The <code>merge_embedded</code> parameter is passed on to merge2.</p>
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<details class="quote">
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<summary>Source code in <code>preserves/merge.py</code></summary>
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<div class="highlight"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span></span><span class="normal"> 8</span>
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<span class="normal"> 9</span>
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<span class="normal">10</span>
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<span class="normal">11</span>
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<span class="normal">12</span>
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<span class="normal">13</span>
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<span class="normal">14</span></pre></div></td><td class="code"><div><pre><span></span><code><span class="k">def</span> <span class="nf">merge</span><span class="p">(</span><span class="n">v0</span><span class="p">,</span> <span class="o">*</span><span class="n">vs</span><span class="p">,</span> <span class="n">merge_embedded</span><span class="o">=</span><span class="kc">None</span><span class="p">):</span>
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<span class="w"> </span><span class="sd">"""Repeatedly merges `v0` with each element in `vs` using [merge2][preserves.merge.merge2],</span>
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<span class="sd"> returning the final result. The `merge_embedded` parameter is passed on to merge2."""</span>
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<span class="n">v</span> <span class="o">=</span> <span class="n">v0</span>
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<span class="k">for</span> <span class="n">vN</span> <span class="ow">in</span> <span class="n">vs</span><span class="p">:</span>
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<span class="n">v</span> <span class="o">=</span> <span class="n">merge2</span><span class="p">(</span><span class="n">v</span><span class="p">,</span> <span class="n">vN</span><span class="p">,</span> <span class="n">merge_embedded</span><span class="o">=</span><span class="n">merge_embedded</span><span class="p">)</span>
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<span class="k">return</span> <span class="n">v</span>
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</code></pre></div></td></tr></table></div>
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</details>
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</div>
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</div>
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<div class="doc doc-object doc-function">
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<h2 id="preserves.merge.merge2" class="doc doc-heading">
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<code class="highlight language-python"><span class="n">merge2</span><span class="p">(</span><span class="n">a</span><span class="p">,</span> <span class="n">b</span><span class="p">,</span> <span class="n">merge_embedded</span><span class="o">=</span><span class="kc">None</span><span class="p">)</span></code>
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</h2>
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<div class="doc doc-contents ">
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<p>Merges <code>a</code> and <code>b</code>, returning the result. Raises <code>ValueError</code> if, during the merge, a
|
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pair of incompatible values is discovered.</p>
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<p>If <code>a</code> and <code>b</code> are <a class="autorefs autorefs-internal" href="../values/#preserves.values.Embedded">Embedded</a> objects, their <code>embeddedValue</code>s
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are merged using <code>merge_embedded</code>, and the result is again wrapped in an
|
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<a class="autorefs autorefs-internal" href="../values/#preserves.values.Embedded">Embedded</a> object.</p>
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<div class="highlight"><pre><span></span><code><span class="o">>>></span> <span class="n">merge2</span><span class="p">(</span><span class="mi">123</span><span class="p">,</span> <span class="mi">234</span><span class="p">)</span>
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<span class="n">Traceback</span> <span class="p">(</span><span class="n">most</span> <span class="n">recent</span> <span class="n">call</span> <span class="n">last</span><span class="p">):</span>
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<span class="o">...</span>
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<span class="ne">ValueError</span><span class="p">:</span> <span class="n">Cannot</span> <span class="n">merge</span> <span class="n">items</span>
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<span class="o">>>></span> <span class="n">merge2</span><span class="p">(</span><span class="mi">123</span><span class="p">,</span> <span class="mi">123</span><span class="p">)</span>
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<span class="mi">123</span>
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<span class="o">>>></span> <span class="n">merge2</span><span class="p">(</span><span class="s1">'hi'</span><span class="p">,</span> <span class="mi">0</span><span class="p">)</span>
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<span class="n">Traceback</span> <span class="p">(</span><span class="n">most</span> <span class="n">recent</span> <span class="n">call</span> <span class="n">last</span><span class="p">):</span>
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<span class="o">...</span>
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<span class="ne">ValueError</span><span class="p">:</span> <span class="n">Cannot</span> <span class="n">merge</span> <span class="n">items</span>
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<span class="o">>>></span> <span class="n">merge2</span><span class="p">([</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">],</span> <span class="p">[</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">])</span>
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<span class="p">[</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">]</span>
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<span class="o">>>></span> <span class="n">merge2</span><span class="p">([</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">],</span> <span class="p">[</span><span class="mi">1</span><span class="p">,</span> <span class="mi">3</span><span class="p">])</span>
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<span class="n">Traceback</span> <span class="p">(</span><span class="n">most</span> <span class="n">recent</span> <span class="n">call</span> <span class="n">last</span><span class="p">):</span>
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<span class="o">...</span>
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<span class="ne">ValueError</span><span class="p">:</span> <span class="n">Cannot</span> <span class="n">merge</span> <span class="n">items</span>
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<span class="o">>>></span> <span class="n">merge2</span><span class="p">({</span><span class="s1">'a'</span><span class="p">:</span> <span class="mi">1</span><span class="p">,</span> <span class="s1">'b'</span><span class="p">:</span> <span class="mi">2</span><span class="p">},</span> <span class="p">{</span><span class="s1">'a'</span><span class="p">:</span> <span class="mi">1</span><span class="p">,</span> <span class="s1">'c'</span><span class="p">:</span> <span class="mi">3</span><span class="p">})</span>
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<span class="p">{</span><span class="s1">'a'</span><span class="p">:</span> <span class="mi">1</span><span class="p">,</span> <span class="s1">'b'</span><span class="p">:</span> <span class="mi">2</span><span class="p">,</span> <span class="s1">'c'</span><span class="p">:</span> <span class="mi">3</span><span class="p">}</span>
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<span class="o">>>></span> <span class="n">merge2</span><span class="p">({</span><span class="s1">'a'</span><span class="p">:</span> <span class="mi">1</span><span class="p">,</span> <span class="s1">'b'</span><span class="p">:</span> <span class="mi">2</span><span class="p">},</span> <span class="p">{</span><span class="s1">'a'</span><span class="p">:</span> <span class="mi">10</span><span class="p">,</span> <span class="s1">'c'</span><span class="p">:</span> <span class="mi">3</span><span class="p">})</span>
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<span class="n">Traceback</span> <span class="p">(</span><span class="n">most</span> <span class="n">recent</span> <span class="n">call</span> <span class="n">last</span><span class="p">):</span>
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<span class="o">...</span>
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<span class="ne">ValueError</span><span class="p">:</span> <span class="n">Cannot</span> <span class="n">merge</span> <span class="n">items</span>
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<span class="o">>>></span> <span class="n">merge2</span><span class="p">(</span><span class="n">Record</span><span class="p">(</span><span class="s1">'a'</span><span class="p">,</span> <span class="p">[</span><span class="mi">1</span><span class="p">,</span> <span class="p">{</span><span class="s1">'x'</span><span class="p">:</span> <span class="mi">2</span><span class="p">}]),</span> <span class="n">Record</span><span class="p">(</span><span class="s1">'a'</span><span class="p">,</span> <span class="p">[</span><span class="mi">1</span><span class="p">,</span> <span class="p">{</span><span class="s1">'y'</span><span class="p">:</span> <span class="mi">3</span><span class="p">}]))</span>
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<span class="s1">'a'</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="p">{</span><span class="s1">'x'</span><span class="p">:</span> <span class="mi">2</span><span class="p">,</span> <span class="s1">'y'</span><span class="p">:</span> <span class="mi">3</span><span class="p">})</span>
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</code></pre></div>
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<details class="quote">
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<summary>Source code in <code>preserves/merge.py</code></summary>
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<div class="highlight"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span></span><span class="normal">23</span>
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<span class="normal">82</span></pre></div></td><td class="code"><div><pre><span></span><code><span class="k">def</span> <span class="nf">merge2</span><span class="p">(</span><span class="n">a</span><span class="p">,</span> <span class="n">b</span><span class="p">,</span> <span class="n">merge_embedded</span><span class="o">=</span><span class="kc">None</span><span class="p">):</span>
|
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<span class="w"> </span><span class="sd">"""Merges `a` and `b`, returning the result. Raises `ValueError` if, during the merge, a</span>
|
|
<span class="sd"> pair of incompatible values is discovered.</span>
|
|
|
|
<span class="sd"> If `a` and `b` are [Embedded][preserves.values.Embedded] objects, their `embeddedValue`s</span>
|
|
<span class="sd"> are merged using `merge_embedded`, and the result is again wrapped in an</span>
|
|
<span class="sd"> [Embedded][preserves.values.Embedded] object.</span>
|
|
|
|
<span class="sd"> ```python</span>
|
|
<span class="sd"> >>> merge2(123, 234)</span>
|
|
<span class="sd"> Traceback (most recent call last):</span>
|
|
<span class="sd"> ...</span>
|
|
<span class="sd"> ValueError: Cannot merge items</span>
|
|
<span class="sd"> >>> merge2(123, 123)</span>
|
|
<span class="sd"> 123</span>
|
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<span class="sd"> >>> merge2('hi', 0)</span>
|
|
<span class="sd"> Traceback (most recent call last):</span>
|
|
<span class="sd"> ...</span>
|
|
<span class="sd"> ValueError: Cannot merge items</span>
|
|
<span class="sd"> >>> merge2([1, 2], [1, 2])</span>
|
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<span class="sd"> [1, 2]</span>
|
|
<span class="sd"> >>> merge2([1, 2], [1, 3])</span>
|
|
<span class="sd"> Traceback (most recent call last):</span>
|
|
<span class="sd"> ...</span>
|
|
<span class="sd"> ValueError: Cannot merge items</span>
|
|
<span class="sd"> >>> merge2({'a': 1, 'b': 2}, {'a': 1, 'c': 3})</span>
|
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<span class="sd"> {'a': 1, 'b': 2, 'c': 3}</span>
|
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<span class="sd"> >>> merge2({'a': 1, 'b': 2}, {'a': 10, 'c': 3})</span>
|
|
<span class="sd"> Traceback (most recent call last):</span>
|
|
<span class="sd"> ...</span>
|
|
<span class="sd"> ValueError: Cannot merge items</span>
|
|
<span class="sd"> >>> merge2(Record('a', [1, {'x': 2}]), Record('a', [1, {'y': 3}]))</span>
|
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<span class="sd"> 'a'(1, {'x': 2, 'y': 3})</span>
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<span class="sd"> ```</span>
|
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<span class="sd"> """</span>
|
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<span class="k">if</span> <span class="n">a</span> <span class="o">==</span> <span class="n">b</span><span class="p">:</span>
|
|
<span class="k">return</span> <span class="n">a</span>
|
|
<span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">a</span><span class="p">,</span> <span class="p">(</span><span class="nb">list</span><span class="p">,</span> <span class="nb">tuple</span><span class="p">))</span> <span class="ow">and</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">b</span><span class="p">,</span> <span class="p">(</span><span class="nb">list</span><span class="p">,</span> <span class="nb">tuple</span><span class="p">)):</span>
|
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<span class="k">return</span> <span class="n">merge_seq</span><span class="p">(</span><span class="n">a</span><span class="p">,</span> <span class="n">b</span><span class="p">)</span>
|
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<span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">a</span><span class="p">,</span> <span class="p">(</span><span class="nb">set</span><span class="p">,</span> <span class="nb">frozenset</span><span class="p">))</span> <span class="ow">and</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">b</span><span class="p">,</span> <span class="p">(</span><span class="nb">set</span><span class="p">,</span> <span class="nb">frozenset</span><span class="p">)):</span>
|
|
<span class="n">_die</span><span class="p">()</span>
|
|
<span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">a</span><span class="p">,</span> <span class="nb">dict</span><span class="p">)</span> <span class="ow">and</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">b</span><span class="p">,</span> <span class="nb">dict</span><span class="p">):</span>
|
|
<span class="n">r</span> <span class="o">=</span> <span class="p">{}</span>
|
|
<span class="k">for</span> <span class="p">(</span><span class="n">ak</span><span class="p">,</span> <span class="n">av</span><span class="p">)</span> <span class="ow">in</span> <span class="n">a</span><span class="o">.</span><span class="n">items</span><span class="p">():</span>
|
|
<span class="n">bv</span> <span class="o">=</span> <span class="n">b</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="n">ak</span><span class="p">,</span> <span class="kc">None</span><span class="p">)</span>
|
|
<span class="n">r</span><span class="p">[</span><span class="n">ak</span><span class="p">]</span> <span class="o">=</span> <span class="n">av</span> <span class="k">if</span> <span class="n">bv</span> <span class="ow">is</span> <span class="kc">None</span> <span class="k">else</span> <span class="n">merge2</span><span class="p">(</span><span class="n">av</span><span class="p">,</span> <span class="n">bv</span><span class="p">,</span> <span class="n">merge_embedded</span><span class="o">=</span><span class="n">merge_embedded</span><span class="p">)</span>
|
|
<span class="k">for</span> <span class="p">(</span><span class="n">bk</span><span class="p">,</span> <span class="n">bv</span><span class="p">)</span> <span class="ow">in</span> <span class="n">b</span><span class="o">.</span><span class="n">items</span><span class="p">():</span>
|
|
<span class="k">if</span> <span class="n">bk</span> <span class="ow">not</span> <span class="ow">in</span> <span class="n">r</span><span class="p">:</span>
|
|
<span class="n">r</span><span class="p">[</span><span class="n">bk</span><span class="p">]</span> <span class="o">=</span> <span class="n">bv</span>
|
|
<span class="k">return</span> <span class="n">r</span>
|
|
<span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">a</span><span class="p">,</span> <span class="n">Record</span><span class="p">)</span> <span class="ow">and</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">b</span><span class="p">,</span> <span class="n">Record</span><span class="p">):</span>
|
|
<span class="k">return</span> <span class="n">Record</span><span class="p">(</span><span class="n">merge2</span><span class="p">(</span><span class="n">a</span><span class="o">.</span><span class="n">key</span><span class="p">,</span> <span class="n">b</span><span class="o">.</span><span class="n">key</span><span class="p">,</span> <span class="n">merge_embedded</span><span class="o">=</span><span class="n">merge_embedded</span><span class="p">),</span>
|
|
<span class="n">merge_seq</span><span class="p">(</span><span class="n">a</span><span class="o">.</span><span class="n">fields</span><span class="p">,</span> <span class="n">b</span><span class="o">.</span><span class="n">fields</span><span class="p">,</span> <span class="n">merge_embedded</span><span class="o">=</span><span class="n">merge_embedded</span><span class="p">))</span>
|
|
<span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">a</span><span class="p">,</span> <span class="n">Embedded</span><span class="p">)</span> <span class="ow">and</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">b</span><span class="p">,</span> <span class="n">Embedded</span><span class="p">):</span>
|
|
<span class="n">m</span> <span class="o">=</span> <span class="p">(</span><span class="n">merge_embedded</span> <span class="ow">or</span> <span class="n">merge_embedded_id</span><span class="p">)(</span><span class="n">a</span><span class="o">.</span><span class="n">embeddedValue</span><span class="p">,</span> <span class="n">b</span><span class="o">.</span><span class="n">embeddedValue</span><span class="p">)</span>
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<span class="k">if</span> <span class="n">m</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span> <span class="n">_die</span><span class="p">()</span>
|
|
<span class="k">return</span> <span class="n">Embedded</span><span class="p">(</span><span class="n">m</span><span class="p">)</span>
|
|
<span class="n">_die</span><span class="p">()</span>
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</code></pre></div></td></tr></table></div>
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</details>
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Last update:
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<span class="git-revision-date-localized-plugin git-revision-date-localized-plugin-date">March 16, 2023</span>
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<br>
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Created:
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