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<h1 id="test_derived_from_path_resolving">test_derived_from_path_resolving</h1>
<div class="doc doc-object doc-module">
<a id="tests.test_process.test_derived_from_path_resolving"></a>
<div class="doc doc-contents first">
<p>The <code>derivedFrom</code> attribute in SVD is a powerful feature that allows reuse of elements (like registers, clusters, and
fields) across different parts of a peripheral definition. It is used to reference existing definitions and inherit
their attributes without having to redefine them. This reduces redundancy and helps maintain consistency within complex
device descriptions.</p>
<p>The <code>derivedFrom</code> path resolving mechanism is crucial in determining how references are processed. Paths can vary in
complexity, ranging from simple names to more intricate, nested references within clusters. A robust parser
implementation must correctly interpret these paths, supporting multiple levels of hierarchy while handling any scope
ambiguities. Additionally, the parser should gracefully handle errors when the paths are incorrect, issuing clear
diagnostic messages to aid debugging.</p>
<p>According to <a href="https://github.com/Open-CMSIS-Pack/devtools/issues/815#issuecomment-1495681319">this</a>, the deriving
algorithm works as follows:</p>
<ol>
<li>
<p><strong>Initialization:</strong> - Split the deriving path (the string in the <code>derivedFrom</code> attribute) by <code>.</code> and store it in
array $P$. For example, if the path is <code>x.y.z</code>, then $P_0 = ext{x}$, $P_1 = ext{y}$, and $P_2 = ext{z}$. - Set
index $i = 0$. - Store the deriving element (the element with the <code>derivedFrom</code> attribute) in variable $D$. - Store the
deriving element $D$ in variable $C$ (i.e., $C = D$). - Get the parent of the current element $C$ and set it as the
current node (i.e., $C = C. ext{parent()}$).</p>
</li>
<li>
<p><strong>Search in the current scope:</strong> - For each child of $C$, do the following: - Ignore the child if it is the same as
$D$, to not match the deriving element itself. - Check if the child’s name matches $P_i$. - If a match is found: 1.
Check if $P_{i+1}$ exists (i.e., there is a next element in the path). - <strong>If $P_{i+1}$ does not exist:</strong> - Verify if
the child has the same type as $D$ (e.g., both are registers): - <strong>If it does,</strong> the base element is found. Stop the
search. - <strong>If it does not,</strong> continue the algorithm (go to step 3). - <strong>If $P_{i+1}$ exists:</strong> - Increment $i$ (i.e.,
move to the next part of the path). - Set $C$ to the child element that matched $P_i$ and proceed to step 2 to continue
searching down the hierarchy.</p>
</li>
<li>
<p><strong>Fallback search at the top level (peripherals):</strong> - If no match was found within the current scope, start searching
from the top-level container (referred to as <code>peripherals</code>): - Set $C$ to the <code>peripherals</code> container, which is the
container that holds all peripherals. - Set $i = 0$ (start over from the beginning of the path). - Repeat step 2 from
the <code>peripherals</code> container: - Check if there is a child of $C$ that matches $P_i$. - Proceed with the same logic as in
step 2, following the path $P$.</p>
</li>
<li>
<p><strong>Termination:</strong> - If the algorithm finds a match at any point, stop the search and return the base element. - If no
match is found after searching through both the local scope and the top-level container, conclude that the base element
could not be found.</p>
</li>
</ol>
<p>In this chapter, we focus on test cases that validate the path resolving mechanism of <code>derivedFrom</code>. Each test case
involves substituting the <code>derivedFrom</code> path with multiple variations, and then testing whether the parser can correctly
process or reject each of these paths. Importantly, each test file is not a single test case; instead, each test file
contains exactly one <code>derivedFrom</code> attribute, and multiple paths are tested against it. This approach allows us to
thoroughly validate path resolving in different scenarios using the same base SVD setup.</p>
<p>In the provided implementation examples, the <code>pytest</code> parameterization feature is utilized to test these paths. Paths
that are expected to be valid and processable are not marked with <code>pytest</code>'s xmark, while paths that are expected to
raise errors are marked with <code>pytest.mark.xfail</code>. Furthermore, test cases which are marked with <code>pytest.mark.xfail</code> are
not processable with <code>svdconv</code>, whereas the others can be processed with <code>svdconv</code> if not statet otherwise.</p>
<div class="doc doc-children">
<div class="doc doc-object doc-function">
<h2 class="doc doc-heading" id="tests.test_process.test_derived_from_path_resolving.test_test_setup_1">
<code class="highlight language-python"><span class="n">test_test_setup_1</span></code>
</h2>
<div class="doc doc-contents">
<p>This test setup explores <code>derivedFrom</code> path resolution within a single peripheral that contains nested
clusters. The setup verifies whether the parser can correctly resolve paths to registers located within
different levels of nested clusters. Additionally, it ensures that invalid paths are properly flagged as
errors.</p>
<p><strong>Expected Outcome:</strong> Paths that correctly reference the target should be processed successfully. Invalid paths
should raise an error, and the parser should provide clear diagnostics indicating the issue. This mimics
<code>svdconv</code>'s behavior.</p>
<p><strong>Processable with svdconv:</strong> partly</p>
<details class="quote">
<summary>Source code in <code>tests/test_process/test_derived_from_path_resolving.py</code></summary>
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<span class="normal">163</span></pre></div></td><td class="code"><div><pre><span></span><code><span class="nd">@pytest</span><span class="o">.</span><span class="n">mark</span><span class="o">.</span><span class="n">parametrize</span><span class="p">(</span>
<span class="s2">"path"</span><span class="p">,</span>
<span class="p">[</span>
<span class="n">pytest</span><span class="o">.</span><span class="n">param</span><span class="p">(</span>
<span class="s2">"PeripheralA.ClusterA.ClusterB.RegisterA"</span><span class="p">,</span>
<span class="n">marks</span><span class="o">=</span><span class="n">pytest</span><span class="o">.</span><span class="n">mark</span><span class="o">.</span><span class="n">filterwarnings</span><span class="p">(</span><span class="s2">"error::svdsuite.process.ProcessWarning"</span><span class="p">),</span>
<span class="p">),</span>
<span class="n">pytest</span><span class="o">.</span><span class="n">param</span><span class="p">(</span>
<span class="s2">"ClusterA.ClusterB.RegisterA"</span><span class="p">,</span>
<span class="n">marks</span><span class="o">=</span><span class="n">pytest</span><span class="o">.</span><span class="n">mark</span><span class="o">.</span><span class="n">filterwarnings</span><span class="p">(</span><span class="s2">"error::svdsuite.process.ProcessWarning"</span><span class="p">),</span>
<span class="p">),</span>
<span class="n">pytest</span><span class="o">.</span><span class="n">param</span><span class="p">(</span>
<span class="s2">"PeripheralAA.ClusterA.ClusterB.RegisterA"</span><span class="p">,</span>
<span class="n">marks</span><span class="o">=</span><span class="n">pytest</span><span class="o">.</span><span class="n">mark</span><span class="o">.</span><span class="n">xfail</span><span class="p">(</span><span class="n">strict</span><span class="o">=</span><span class="kc">True</span><span class="p">,</span> <span class="n">raises</span><span class="o">=</span><span class="n">ProcessException</span><span class="p">),</span>
<span class="p">),</span>
<span class="n">pytest</span><span class="o">.</span><span class="n">param</span><span class="p">(</span>
<span class="s2">"PeripheralA.ClusterAA.ClusterB.RegisterA"</span><span class="p">,</span>
<span class="n">marks</span><span class="o">=</span><span class="n">pytest</span><span class="o">.</span><span class="n">mark</span><span class="o">.</span><span class="n">xfail</span><span class="p">(</span><span class="n">strict</span><span class="o">=</span><span class="kc">True</span><span class="p">,</span> <span class="n">raises</span><span class="o">=</span><span class="n">ProcessException</span><span class="p">),</span>
<span class="p">),</span>
<span class="n">pytest</span><span class="o">.</span><span class="n">param</span><span class="p">(</span>
<span class="s2">"PeripheralA.ClusterA.ClusterBB.RegisterA"</span><span class="p">,</span>
<span class="n">marks</span><span class="o">=</span><span class="n">pytest</span><span class="o">.</span><span class="n">mark</span><span class="o">.</span><span class="n">xfail</span><span class="p">(</span><span class="n">strict</span><span class="o">=</span><span class="kc">True</span><span class="p">,</span> <span class="n">raises</span><span class="o">=</span><span class="n">ProcessException</span><span class="p">),</span>
<span class="p">),</span>
<span class="n">pytest</span><span class="o">.</span><span class="n">param</span><span class="p">(</span>
<span class="s2">"PeripheralA.ClusterA.ClusterB.RegisterAA"</span><span class="p">,</span>
<span class="n">marks</span><span class="o">=</span><span class="n">pytest</span><span class="o">.</span><span class="n">mark</span><span class="o">.</span><span class="n">xfail</span><span class="p">(</span><span class="n">strict</span><span class="o">=</span><span class="kc">True</span><span class="p">,</span> <span class="n">raises</span><span class="o">=</span><span class="n">ProcessException</span><span class="p">),</span>
<span class="p">),</span>
<span class="n">pytest</span><span class="o">.</span><span class="n">param</span><span class="p">(</span>
<span class="s2">"PeripheralA.ClusterB.RegisterA"</span><span class="p">,</span>
<span class="n">marks</span><span class="o">=</span><span class="n">pytest</span><span class="o">.</span><span class="n">mark</span><span class="o">.</span><span class="n">xfail</span><span class="p">(</span><span class="n">strict</span><span class="o">=</span><span class="kc">True</span><span class="p">,</span> <span class="n">raises</span><span class="o">=</span><span class="n">ProcessException</span><span class="p">),</span>
<span class="p">),</span>
<span class="n">pytest</span><span class="o">.</span><span class="n">param</span><span class="p">(</span>
<span class="s2">"PeripheralA.ClusterA.RegisterA"</span><span class="p">,</span>
<span class="n">marks</span><span class="o">=</span><span class="n">pytest</span><span class="o">.</span><span class="n">mark</span><span class="o">.</span><span class="n">xfail</span><span class="p">(</span><span class="n">strict</span><span class="o">=</span><span class="kc">True</span><span class="p">,</span> <span class="n">raises</span><span class="o">=</span><span class="n">ProcessException</span><span class="p">),</span>
<span class="p">),</span>
<span class="n">pytest</span><span class="o">.</span><span class="n">param</span><span class="p">(</span>
<span class="s2">"PeripheralA.RegisterA"</span><span class="p">,</span>
<span class="n">marks</span><span class="o">=</span><span class="n">pytest</span><span class="o">.</span><span class="n">mark</span><span class="o">.</span><span class="n">xfail</span><span class="p">(</span><span class="n">strict</span><span class="o">=</span><span class="kc">True</span><span class="p">,</span> <span class="n">raises</span><span class="o">=</span><span class="n">ProcessException</span><span class="p">),</span>
<span class="p">),</span>
<span class="n">pytest</span><span class="o">.</span><span class="n">param</span><span class="p">(</span>
<span class="s2">"RegisterA"</span><span class="p">,</span>
<span class="n">marks</span><span class="o">=</span><span class="n">pytest</span><span class="o">.</span><span class="n">mark</span><span class="o">.</span><span class="n">xfail</span><span class="p">(</span><span class="n">strict</span><span class="o">=</span><span class="kc">True</span><span class="p">,</span> <span class="n">raises</span><span class="o">=</span><span class="n">ProcessException</span><span class="p">),</span>
<span class="p">),</span>
<span class="n">pytest</span><span class="o">.</span><span class="n">param</span><span class="p">(</span>
<span class="s2">"ClusterB.RegisterA"</span><span class="p">,</span>
<span class="n">marks</span><span class="o">=</span><span class="n">pytest</span><span class="o">.</span><span class="n">mark</span><span class="o">.</span><span class="n">xfail</span><span class="p">(</span><span class="n">strict</span><span class="o">=</span><span class="kc">True</span><span class="p">,</span> <span class="n">raises</span><span class="o">=</span><span class="n">ProcessException</span><span class="p">),</span>
<span class="p">),</span>
<span class="n">pytest</span><span class="o">.</span><span class="n">param</span><span class="p">(</span>
<span class="s2">"ClusterA.RegisterA"</span><span class="p">,</span>
<span class="n">marks</span><span class="o">=</span><span class="n">pytest</span><span class="o">.</span><span class="n">mark</span><span class="o">.</span><span class="n">xfail</span><span class="p">(</span><span class="n">strict</span><span class="o">=</span><span class="kc">True</span><span class="p">,</span> <span class="n">raises</span><span class="o">=</span><span class="n">ProcessException</span><span class="p">),</span>
<span class="p">),</span>
<span class="p">],</span>
<span class="p">)</span>
<span class="k">def</span><span class="w"> </span><span class="nf">test_test_setup_1</span><span class="p">(</span><span class="n">path</span><span class="p">:</span> <span class="nb">str</span><span class="p">,</span> <span class="n">get_test_svd_file_content</span><span class="p">:</span> <span class="n">Callable</span><span class="p">[[</span><span class="nb">str</span><span class="p">],</span> <span class="nb">bytes</span><span class="p">]):</span>
<span class="w"> </span><span class="sd">"""</span>
<span class="sd"> This test setup explores `derivedFrom` path resolution within a single peripheral that contains nested</span>
<span class="sd"> clusters. The setup verifies whether the parser can correctly resolve paths to registers located within</span>
<span class="sd"> different levels of nested clusters. Additionally, it ensures that invalid paths are properly flagged as</span>
<span class="sd"> errors.</span>
<span class="sd"> **Expected Outcome:** Paths that correctly reference the target should be processed successfully. Invalid paths</span>
<span class="sd"> should raise an error, and the parser should provide clear diagnostics indicating the issue. This mimics</span>
<span class="sd"> `svdconv`'s behavior.</span>
<span class="sd"> **Processable with svdconv:** partly</span>
<span class="sd"> """</span>
<span class="n">file_name</span> <span class="o">=</span> <span class="s2">"derivedfrom_path_resolving/test_setup_1.svd"</span>
<span class="n">file_content</span> <span class="o">=</span> <span class="n">get_test_svd_file_content</span><span class="p">(</span><span class="n">file_name</span><span class="p">)</span>
<span class="n">file_content</span> <span class="o">=</span> <span class="n">file_content</span><span class="o">.</span><span class="n">replace</span><span class="p">(</span><span class="sa">b</span><span class="s2">"PATH"</span><span class="p">,</span> <span class="n">path</span><span class="o">.</span><span class="n">encode</span><span class="p">())</span>
<span class="n">device</span> <span class="o">=</span> <span class="n">Process</span><span class="o">.</span><span class="n">from_xml_content</span><span class="p">(</span><span class="n">file_content</span><span class="p">)</span><span class="o">.</span><span class="n">get_processed_device</span><span class="p">()</span>
<span class="k">assert</span> <span class="nb">len</span><span class="p">(</span><span class="n">device</span><span class="o">.</span><span class="n">peripherals</span><span class="p">)</span> <span class="o">==</span> <span class="mi">1</span>
<span class="k">assert</span> <span class="nb">len</span><span class="p">(</span><span class="n">device</span><span class="o">.</span><span class="n">peripherals</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span><span class="o">.</span><span class="n">registers_clusters</span><span class="p">)</span> <span class="o">==</span> <span class="mi">2</span>
<span class="k">assert</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">device</span><span class="o">.</span><span class="n">peripherals</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span><span class="o">.</span><span class="n">registers_clusters</span><span class="p">[</span><span class="mi">0</span><span class="p">],</span> <span class="n">Cluster</span><span class="p">)</span>
<span class="k">assert</span> <span class="n">device</span><span class="o">.</span><span class="n">peripherals</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span><span class="o">.</span><span class="n">registers_clusters</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span><span class="o">.</span><span class="n">name</span> <span class="o">==</span> <span class="s2">"ClusterA"</span>
<span class="k">assert</span> <span class="nb">len</span><span class="p">(</span><span class="n">device</span><span class="o">.</span><span class="n">peripherals</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span><span class="o">.</span><span class="n">registers_clusters</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span><span class="o">.</span><span class="n">registers_clusters</span><span class="p">)</span> <span class="o">==</span> <span class="mi">1</span>
<span class="k">assert</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">device</span><span class="o">.</span><span class="n">peripherals</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span><span class="o">.</span><span class="n">registers_clusters</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span><span class="o">.</span><span class="n">registers_clusters</span><span class="p">[</span><span class="mi">0</span><span class="p">],</span> <span class="n">Cluster</span><span class="p">)</span>
<span class="k">assert</span> <span class="n">device</span><span class="o">.</span><span class="n">peripherals</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span><span class="o">.</span><span class="n">registers_clusters</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span><span class="o">.</span><span class="n">registers_clusters</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span><span class="o">.</span><span class="n">name</span> <span class="o">==</span> <span class="s2">"ClusterB"</span>
<span class="k">assert</span> <span class="nb">len</span><span class="p">(</span><span class="n">device</span><span class="o">.</span><span class="n">peripherals</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span><span class="o">.</span><span class="n">registers_clusters</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span><span class="o">.</span><span class="n">registers_clusters</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span><span class="o">.</span><span class="n">registers_clusters</span><span class="p">)</span> <span class="o">==</span> <span class="mi">1</span>
<span class="n">registera</span> <span class="o">=</span> <span class="n">device</span><span class="o">.</span><span class="n">peripherals</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span><span class="o">.</span><span class="n">registers_clusters</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span><span class="o">.</span><span class="n">registers_clusters</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span><span class="o">.</span><span class="n">registers_clusters</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span>
<span class="k">assert</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">registera</span><span class="p">,</span> <span class="n">Register</span><span class="p">)</span>
<span class="k">assert</span> <span class="n">registera</span><span class="o">.</span><span class="n">name</span> <span class="o">==</span> <span class="s2">"RegisterA"</span>
<span class="k">assert</span> <span class="n">registera</span><span class="o">.</span><span class="n">address_offset</span> <span class="o">==</span> <span class="mh">0x0</span>
<span class="k">assert</span> <span class="n">registera</span><span class="o">.</span><span class="n">size</span> <span class="o">==</span> <span class="mi">32</span>
<span class="k">assert</span> <span class="nb">len</span><span class="p">(</span><span class="n">registera</span><span class="o">.</span><span class="n">fields</span><span class="p">)</span> <span class="o">==</span> <span class="mi">1</span>
<span class="k">assert</span> <span class="n">registera</span><span class="o">.</span><span class="n">fields</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span><span class="o">.</span><span class="n">name</span> <span class="o">==</span> <span class="s2">"FieldA"</span>
<span class="k">assert</span> <span class="n">registera</span><span class="o">.</span><span class="n">fields</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span><span class="o">.</span><span class="n">lsb</span> <span class="o">==</span> <span class="mi">0</span>
<span class="k">assert</span> <span class="n">registera</span><span class="o">.</span><span class="n">fields</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span><span class="o">.</span><span class="n">msb</span> <span class="o">==</span> <span class="mi">0</span>
<span class="k">assert</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">device</span><span class="o">.</span><span class="n">peripherals</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span><span class="o">.</span><span class="n">registers_clusters</span><span class="p">[</span><span class="mi">1</span><span class="p">],</span> <span class="n">Register</span><span class="p">)</span>
<span class="k">assert</span> <span class="n">device</span><span class="o">.</span><span class="n">peripherals</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span><span class="o">.</span><span class="n">registers_clusters</span><span class="p">[</span><span class="mi">1</span><span class="p">]</span><span class="o">.</span><span class="n">name</span> <span class="o">==</span> <span class="s2">"RegisterB"</span>
<span class="k">assert</span> <span class="n">device</span><span class="o">.</span><span class="n">peripherals</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span><span class="o">.</span><span class="n">registers_clusters</span><span class="p">[</span><span class="mi">1</span><span class="p">]</span><span class="o">.</span><span class="n">address_offset</span> <span class="o">==</span> <span class="mh">0x4</span>
<span class="k">assert</span> <span class="n">device</span><span class="o">.</span><span class="n">peripherals</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span><span class="o">.</span><span class="n">registers_clusters</span><span class="p">[</span><span class="mi">1</span><span class="p">]</span><span class="o">.</span><span class="n">size</span> <span class="o">==</span> <span class="mi">32</span>
<span class="k">assert</span> <span class="nb">len</span><span class="p">(</span><span class="n">device</span><span class="o">.</span><span class="n">peripherals</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span><span class="o">.</span><span class="n">registers_clusters</span><span class="p">[</span><span class="mi">1</span><span class="p">]</span><span class="o">.</span><span class="n">fields</span><span class="p">)</span> <span class="o">==</span> <span class="mi">1</span>