exclude needs under only directive if required (#1103)

.gitignore

@@ -1,4 +1,5 @@
 .idea
+*.iml
 .venv*
 .pvenv
 .nox

sphinx_needs/directives/need.py

@@ -340,6 +340,13 @@ def analyse_need_locations(app: Sphinx, doctree: nodes.document) -> None:
         if need_node.get("hidden"):
             hidden_needs.append(need_node)
 
+        if need_node_excluded_by_only_directive(env, need_node):
+            # the need is excluded as contained in an "only" directive evaluated to False for current tags
+            if hasattr(env, "needs_all_needs"):
+                del env.needs_all_needs[need_id]
+            if need_node.parent is not None and hasattr(need_node.parent, "remove"):
+                need_node.parent.remove(need_node)
+
     # now we have gathered all the information we need,
     # we can remove the hidden needs from the doctree
     for need_node in hidden_needs:
@@ -356,6 +363,18 @@ def previous_sibling(node: nodes.Node) -> Optional[nodes.Node]:
     return node.parent[i - 1] if i > 0 else None  # type: ignore
 
 
+def need_node_excluded_by_only_directive(env: BuildEnvironment, node: nodes.Node) -> bool:
+    """Return True if the node is under an "only" directive that shall be excluded given to the current tags"""
+    parent = node.parent
+    while parent is not None:
+        if hasattr(parent, "tagname") and parent.tagname == "only" and hasattr(parent, "attributes"):
+            # note: we do not manage nested only directive
+            only_tags = parent.attributes.get("expr", "")
+            return not env.app.builder.tags.eval_condition(only_tags)
+        parent = parent.parent
+    return False
+
+
 @profile("NEEDS_POST_PROCESS")
 @measure_time("need_post_process")
 def post_process_needs_data(app: Sphinx) -> None:

tests/doc_test/doc_directive_only/conf.py

@@ -0,0 +1,4 @@
+extensions = ["sphinx_needs"]
+
+# also build the needs.json as some needs shall be hidden in it too
+needs_build_json = True

tests/doc_test/doc_directive_only/index.rst

@@ -0,0 +1,53 @@
+Only directive Test
+=====================
+
+.. req:: always_here_1
+   :id: REQ_000
+
+    out of only is alwasy here
+
+.. only:: tag_a
+
+   .. req:: only_tag_a
+      :id: REQ_001
+
+       I shall not appear if not running tag_a
+
+       .. req:: only_tag_a_again
+          :id: REQ_001_1
+
+           need within need under only, shall neither appear if not running tag_a
+
+
+.. only:: tag_b
+
+   .. req:: only_tag_b
+      :id: REQ_002
+
+      I shall not appear if not running tag_b
+
+
+.. only:: tag_a or tag_b
+
+   .. req:: only_tag_a_or_b
+      :id: REQ_003
+
+      I shall not appear if not running either tag_a or tag_b
+
+
+.. req:: always_here_2
+   :id: REQ_004
+
+    I shall always appear
+
+
+Needs table
+--------------
+
+.. needtable::
+
+
+Needs list
+--------------
+.. needlist::
+

tests/test_directive_only_exclusion.py

@@ -0,0 +1,100 @@
+import json
+from pathlib import Path
+
+import pytest
+
+
+def is_need_present(need_id, html, needs_list, is_present=True):
+    assert (
+        is_need_in_html(need_id, html) is is_present
+    ), f"{need_id} should {'not ' if not is_present else ''}be present in html"
+
+    assert (
+        is_need_in_needtable(need_id, html) is is_present
+    ), f"{need_id} should {'not ' if not is_present else ''}be present in needtable"
+
+    assert (
+        is_need_in_needlist(need_id, html) is is_present
+    ), f"{need_id} should {'not ' if not is_present else ''}be present in needlist"
+
+    assert (
+        need_id in needs_list
+    ) is is_present, f"{need_id} should {'not ' if not is_present else ''}be present in needs.json"
+
+
+def is_need_in_html(need_id, html):
+    return 'id="' + need_id + '">' in html
+
+
+def is_need_in_needtable(need_id, html):
+    return (
+        '<td class="needs_id"><p><a class="reference internal" href="#' + need_id + '">' + need_id + "</a></p></td>"
+        in html
+    )
+
+
+def is_need_in_needlist(need_id, html):
+    return '<div class="line"><a class="reference external" href="#' + need_id + '">' + need_id + ":" in html
+
+
+def get_json_needs(needs_file: Path):
+    with open(needs_file) as file:
+        data = json.load(file)
+        return data["versions"][data["current_version"]]["needs"]
+
+
+@pytest.mark.parametrize(
+    "test_app",
+    [
+        {"buildername": "html", "srcdir": "doc_test/doc_directive_only", "tags": ["tag_a"]},
+    ],
+    indirect=True,
+)
+def test_need_excluded_under_only_a(test_app):
+    app = test_app
+    app.build()
+    html = Path(app.outdir, "index.html").read_text()
+    needs_list = get_json_needs(Path(app.outdir, "needs.json"))
+
+    is_need_present("REQ_000", html, needs_list)
+    is_need_present("REQ_001", html, needs_list)
+    is_need_present("REQ_001_1", html, needs_list)
+    is_need_present("REQ_002", html, needs_list, False)
+    is_need_present("REQ_003", html, needs_list)
+    is_need_present("REQ_004", html, needs_list)
+
+
+@pytest.mark.parametrize(
+    "test_app",
+    [
+        {"buildername": "html", "srcdir": "doc_test/doc_directive_only", "tags": ["tag_b"]},
+    ],
+    indirect=True,
+)
+def test_need_excluded_under_only_b(test_app):
+    app = test_app
+    app.build()
+    html = Path(app.outdir, "index.html").read_text()
+    needs_list = get_json_needs(Path(app.outdir, "needs.json"))
+
+    is_need_present("REQ_000", html, needs_list)
+    is_need_present("REQ_001", html, needs_list, False)
+    is_need_present("REQ_001_1", html, needs_list, False)
+    is_need_present("REQ_002", html, needs_list)
+    is_need_present("REQ_003", html, needs_list)
+    is_need_present("REQ_004", html, needs_list)
+
+
+@pytest.mark.parametrize("test_app", [{"buildername": "html", "srcdir": "doc_test/doc_directive_only"}], indirect=True)
+def test_need_excluded_under_only_no_tag(test_app):
+    app = test_app
+    app.build()
+    html = Path(app.outdir, "index.html").read_text()
+    needs_list = get_json_needs(Path(app.outdir, "needs.json"))
+
+    is_need_present("REQ_000", html, needs_list)
+    is_need_present("REQ_001", html, needs_list, False)
+    is_need_present("REQ_001_1", html, needs_list, False)
+    is_need_present("REQ_002", html, needs_list, False)
+    is_need_present("REQ_003", html, needs_list, False)
+    is_need_present("REQ_004", html, needs_list)