[pydoclint] Deduplicate collected exceptions after traversing funct…

…ion bodies

crates/ruff_linter/resources/test/fixtures/pydoclint/DOC501_google.py

@@ -232,3 +232,17 @@ def calculate_speed(distance: float, time: float) -> float:
     except Exception as e:
         print(f"Oh no, we encountered {e}")
         raise
+
+
+def foo():
+    """Foo.
+
+    Returns:
+        42: int.
+    """
+    if True:
+        raise TypeError  # DOC501
+    else:
+        raise TypeError  # no DOC501 here because we already emitted a diagnostic for the earlier `raise TypeError`
+    raise ValueError  # DOC501
+    return 42

crates/ruff_linter/resources/test/fixtures/pydoclint/DOC501_numpy.py

@@ -133,3 +133,19 @@ def calculate_speed(distance: float, time: float) -> float:
     except Exception as e:
         print(f"Oh no, we encountered {e}")
         raise
+
+
+def foo():
+    """Foo.
+
+    Returns
+    -------
+    int
+        42
+    """
+    if True:
+        raise TypeError  # DOC501
+    else:
+        raise TypeError  # no DOC501 here because we already emitted a diagnostic for the earlier `raise TypeError`
+    raise ValueError  # DOC501
+    return 42

crates/ruff_linter/src/rules/pydoclint/rules/check_docstring.rs

@@ -523,10 +523,31 @@ impl<'a> BodyVisitor<'a> {
     }
 
     fn finish(self) -> BodyEntries<'a> {
+        let BodyVisitor {
+            returns,
+            yields,
+            mut raised_exceptions,
+            ..
+        } = self;
+
+        // Deduplicate exceptions collected:
+        // no need to complain twice about `raise TypeError` not being documented
+        // just because there are two separate `raise TypeError` statements in the function
+        raised_exceptions.sort_unstable_by(|left, right| {
+            left.qualified_name
+                .segments()
+                .cmp(right.qualified_name.segments())
+                .then_with(|| left.start().cmp(&right.start()))
+                .then_with(|| left.end().cmp(&right.end()))
+        });
+        raised_exceptions.dedup_by(|left, right| {
+            left.qualified_name.segments() == right.qualified_name.segments()
+        });
+
         BodyEntries {
-            returns: self.returns,
-            yields: self.yields,
-            raised_exceptions: self.raised_exceptions,
+            returns,
+            yields,
+            raised_exceptions,
         }
     }
 }

crates/ruff_linter/src/rules/pydoclint/snapshots/ruff_linter__rules__pydoclint__tests__docstring-missing-exception_DOC501_google.py.snap

@@ -67,3 +67,24 @@ DOC501_google.py:213:9: DOC501 Raised exception `ZeroDivisionError` missing from
 215 |         print("Not a number? Shame on you!")
     |
     = help: Add `ZeroDivisionError` to the docstring
+
+DOC501_google.py:244:15: DOC501 Raised exception `TypeError` missing from docstring
+    |
+242 |     """
+243 |     if True:
+244 |         raise TypeError  # DOC501
+    |               ^^^^^^^^^ DOC501
+245 |     else:
+246 |         raise TypeError  # no DOC501 here because we already emitted a diagnostic for the earlier `raise TypeError`
+    |
+    = help: Add `TypeError` to the docstring
+
+DOC501_google.py:247:11: DOC501 Raised exception `ValueError` missing from docstring
+    |
+245 |     else:
+246 |         raise TypeError  # no DOC501 here because we already emitted a diagnostic for the earlier `raise TypeError`
+247 |     raise ValueError  # DOC501
+    |           ^^^^^^^^^^ DOC501
+248 |     return 42
+    |
+    = help: Add `ValueError` to the docstring

crates/ruff_linter/src/rules/pydoclint/snapshots/ruff_linter__rules__pydoclint__tests__docstring-missing-exception_DOC501_numpy.py.snap

@@ -38,3 +38,24 @@ DOC501_numpy.py:111:9: DOC501 Raised exception `TypeError` missing from docstrin
     |         ^^^^^ DOC501
     |
     = help: Add `TypeError` to the docstring
+
+DOC501_numpy.py:147:15: DOC501 Raised exception `TypeError` missing from docstring
+    |
+145 |     """
+146 |     if True:
+147 |         raise TypeError  # DOC501
+    |               ^^^^^^^^^ DOC501
+148 |     else:
+149 |         raise TypeError  # no DOC501 here because we already emitted a diagnostic for the earlier `raise TypeError`
+    |
+    = help: Add `TypeError` to the docstring
+
+DOC501_numpy.py:150:11: DOC501 Raised exception `ValueError` missing from docstring
+    |
+148 |     else:
+149 |         raise TypeError  # no DOC501 here because we already emitted a diagnostic for the earlier `raise TypeError`
+150 |     raise ValueError  # DOC501
+    |           ^^^^^^^^^^ DOC501
+151 |     return 42
+    |
+    = help: Add `ValueError` to the docstring