[perflint] fix missing parentheses for lambda and ternary conditions (PERF401, PERF403)

crates/ruff_linter/resources/test/fixtures/perflint/PERF401.py

@@ -266,3 +266,15 @@ def f():
     result = list()  # this should be replaced with a comprehension
     for i in values:
         result.append(i + 1)  # PERF401
+
+def f():
+    src = [1]
+    dst = []
+
+    for i in src:
+        if True if True else False:
+            dst.append(i)
+
+    for i in src:
+        if lambda: 0:
+            dst.append(i)

crates/ruff_linter/resources/test/fixtures/perflint/PERF403.py

@@ -151,3 +151,16 @@ def foo():
     result = {}
     for idx, name in indices, fruit:
         result[name] = idx  # PERF403
+
+
+def foo():
+    src = (("x", 1),)
+    dst = {}
+
+    for k, v in src:
+        if True if True else False:
+            dst[k] = v
+
+    for k, v in src:
+        if lambda: 0:
+            dst[k] = v

crates/ruff_linter/src/rules/perflint/rules/manual_dict_comprehension.rs

@@ -346,10 +346,11 @@ fn convert_to_dict_comprehension(
             // since if the assignment expression appears
             // internally (e.g. as an operand in a boolean
             // operation) then it will already be parenthesized.
-            if test.is_named_expr() {
-                format!(" if ({})", locator.slice(test.range()))
-            } else {
-                format!(" if {}", locator.slice(test.range()))
+            match test {
+                Expr::Named(_) | Expr::If(_) | Expr::Lambda(_) => {
+                    format!(" if ({})", locator.slice(test.range()))
+                }
+                _ => format!(" if {}", locator.slice(test.range())),
             }
         }
         None => String::new(),

crates/ruff_linter/src/rules/perflint/rules/manual_list_comprehension.rs

@@ -358,7 +358,7 @@ fn convert_to_list_extend(
     fix_type: ComprehensionType,
     binding: &Binding,
     for_stmt: &ast::StmtFor,
-    if_test: Option<&ast::Expr>,
+    if_test: Option<&Expr>,
     to_append: &Expr,
     checker: &Checker,
 ) -> Result<Fix> {
@@ -374,10 +374,11 @@ fn convert_to_list_extend(
             // since if the assignment expression appears
             // internally (e.g. as an operand in a boolean
             // operation) then it will already be parenthesized.
-            if test.is_named_expr() {
-                format!(" if ({})", locator.slice(test.range()))
-            } else {
-                format!(" if {}", locator.slice(test.range()))
+            match test {
+                Expr::Named(_) | Expr::If(_) | Expr::Lambda(_) => {
+                    format!(" if ({})", locator.slice(test.range()))
+                }
+                _ => format!(" if {}", locator.slice(test.range())),
             }
         }
         None => String::new(),

crates/ruff_linter/src/rules/perflint/snapshots/ruff_linter__rules__perflint__tests__PERF401_PERF401.py.snap

@@ -219,5 +219,27 @@ PERF401.py:268:9: PERF401 Use a list comprehension to create a transformed list
 267 |     for i in values:
 268 |         result.append(i + 1)  # PERF401
     |         ^^^^^^^^^^^^^^^^^^^^ PERF401
+269 |
+270 | def f():
     |
     = help: Replace for loop with list comprehension
+
+PERF401.py:276:13: PERF401 Use a list comprehension to create a transformed list
+    |
+274 |     for i in src:
+275 |         if True if True else False:
+276 |             dst.append(i)
+    |             ^^^^^^^^^^^^^ PERF401
+277 |
+278 |     for i in src:
+    |
+    = help: Replace for loop with list comprehension
+
+PERF401.py:280:13: PERF401 Use `list.extend` to create a transformed list
+    |
+278 |     for i in src:
+279 |         if lambda: 0:
+280 |             dst.append(i)
+    |             ^^^^^^^^^^^^^ PERF401
+    |
+    = help: Replace for loop with list.extend

crates/ruff_linter/src/rules/perflint/snapshots/ruff_linter__rules__perflint__tests__PERF403_PERF403.py.snap

@@ -128,3 +128,23 @@ PERF403.py:153:9: PERF403 Use a dictionary comprehension instead of a for-loop
     |         ^^^^^^^^^^^^^^^^^^ PERF403
     |
     = help: Replace for loop with dict comprehension
+
+PERF403.py:162:13: PERF403 Use a dictionary comprehension instead of a for-loop
+    |
+160 |     for k, v in src:
+161 |         if True if True else False:
+162 |             dst[k] = v
+    |             ^^^^^^^^^^ PERF403
+163 |
+164 |     for k, v in src:
+    |
+    = help: Replace for loop with dict comprehension
+
+PERF403.py:166:13: PERF403 Use a dictionary comprehension instead of a for-loop
+    |
+164 |     for k, v in src:
+165 |         if lambda: 0:
+166 |             dst[k] = v
+    |             ^^^^^^^^^^ PERF403
+    |
+    = help: Replace for loop with dict comprehension

crates/ruff_linter/src/rules/perflint/snapshots/ruff_linter__rules__perflint__tests__preview__PERF401_PERF401.py.snap

@@ -517,6 +517,8 @@ PERF401.py:268:9: PERF401 [*] Use a list comprehension to create a transformed l
 267 |     for i in values:
 268 |         result.append(i + 1)  # PERF401
     |         ^^^^^^^^^^^^^^^^^^^^ PERF401
+269 |
+270 | def f():
     |
     = help: Replace for loop with list comprehension
 
@@ -529,3 +531,49 @@ PERF401.py:268:9: PERF401 [*] Use a list comprehension to create a transformed l
 268     |-        result.append(i + 1)  # PERF401
     266 |+    # this should be replaced with a comprehension
     267 |+    result = [i + 1 for i in values]  # PERF401
+269 268 | 
+270 269 | def f():
+271 270 |     src = [1]
+
+PERF401.py:276:13: PERF401 [*] Use a list comprehension to create a transformed list
+    |
+274 |     for i in src:
+275 |         if True if True else False:
+276 |             dst.append(i)
+    |             ^^^^^^^^^^^^^ PERF401
+277 |
+278 |     for i in src:
+    |
+    = help: Replace for loop with list comprehension
+
+ℹ Unsafe fix
+269 269 | 
+270 270 | def f():
+271 271 |     src = [1]
+272     |-    dst = []
+273 272 | 
+274     |-    for i in src:
+275     |-        if True if True else False:
+276     |-            dst.append(i)
+    273 |+    dst = [i for i in src if (True if True else False)]
+277 274 | 
+278 275 |     for i in src:
+279 276 |         if lambda: 0:
+
+PERF401.py:280:13: PERF401 [*] Use `list.extend` to create a transformed list
+    |
+278 |     for i in src:
+279 |         if lambda: 0:
+280 |             dst.append(i)
+    |             ^^^^^^^^^^^^^ PERF401
+    |
+    = help: Replace for loop with list.extend
+
+ℹ Unsafe fix
+275 275 |         if True if True else False:
+276 276 |             dst.append(i)
+277 277 | 
+278     |-    for i in src:
+279     |-        if lambda: 0:
+280     |-            dst.append(i)
+    278 |+    dst.extend(i for i in src if (lambda: 0))

crates/ruff_linter/src/rules/perflint/snapshots/ruff_linter__rules__perflint__tests__preview__PERF403_PERF403.py.snap

@@ -305,3 +305,49 @@ PERF403.py:153:9: PERF403 [*] Use a dictionary comprehension instead of a for-lo
 152     |-    for idx, name in indices, fruit:
 153     |-        result[name] = idx  # PERF403
     151 |+    result = {name: idx for idx, name in (indices, fruit)}  # PERF403
+154 152 | 
+155 153 | 
+156 154 | def foo():
+
+PERF403.py:162:13: PERF403 [*] Use a dictionary comprehension instead of a for-loop
+    |
+160 |     for k, v in src:
+161 |         if True if True else False:
+162 |             dst[k] = v
+    |             ^^^^^^^^^^ PERF403
+163 |
+164 |     for k, v in src:
+    |
+    = help: Replace for loop with dict comprehension
+
+ℹ Unsafe fix
+155 155 | 
+156 156 | def foo():
+157 157 |     src = (("x", 1),)
+158     |-    dst = {}
+159 158 | 
+160     |-    for k, v in src:
+161     |-        if True if True else False:
+162     |-            dst[k] = v
+    159 |+    dst = {k: v for k, v in src if (True if True else False)}
+163 160 | 
+164 161 |     for k, v in src:
+165 162 |         if lambda: 0:
+
+PERF403.py:166:13: PERF403 [*] Use `dict.update` instead of a for-loop
+    |
+164 |     for k, v in src:
+165 |         if lambda: 0:
+166 |             dst[k] = v
+    |             ^^^^^^^^^^ PERF403
+    |
+    = help: Replace for loop with `dict.update`
+
+ℹ Unsafe fix
+161 161 |         if True if True else False:
+162 162 |             dst[k] = v
+163 163 | 
+164     |-    for k, v in src:
+165     |-        if lambda: 0:
+166     |-            dst[k] = v
+    164 |+    dst.update({k: v for k, v in src if (lambda: 0)})