[flake8-simplify] More precise inference for dictionaries (SIM300) (#15164)

Co-authored-by: Micha Reiser <[email protected]>

Author: InSyncWithFoo

crates/ruff_linter/resources/test/fixtures/flake8_simplify/SIM300.py

@@ -14,6 +14,7 @@
 0 < (number - 100)  # SIM300
 B<A[0][0]or B
 B or(B)<A[0][0]
+{"non-empty-dict": "is-ok"} == DummyHandler.CONFIG
 
 # Errors in preview
 ['upper'] == UPPER_LIST
@@ -39,4 +40,7 @@
 (number - 100) > 0
 SECONDS_IN_DAY == 60 * 60 * 24 # Error in 0.1.8
 SomeClass().settings.SOME_CONSTANT_VALUE > (60 * 60) # Error in 0.1.8
-{"non-empty-dict": "is-ok"} == DummyHandler.CONFIG
+
+# https://github.com/astral-sh/ruff/issues/14761
+{"": print(1)} == print(2)
+{0: 1, **print(2)} == print(4)

crates/ruff_linter/src/rules/flake8_simplify/rules/yoda_conditions.rs

@@ -101,13 +101,13 @@ impl From<&Expr> for ConstantLikelihood {
                 .map(ConstantLikelihood::from)
                 .min()
                 .unwrap_or(ConstantLikelihood::Definitely),
-            Expr::Dict(dict) => {
-                if dict.is_empty() {
-                    ConstantLikelihood::Definitely
-                } else {
-                    ConstantLikelihood::Probably
-                }
-            }
+            Expr::Dict(dict) => dict
+                .items
+                .iter()
+                .flat_map(|item| std::iter::once(&item.value).chain(item.key.as_ref()))
+                .map(ConstantLikelihood::from)
+                .min()
+                .unwrap_or(ConstantLikelihood::Definitely),
             Expr::BinOp(ast::ExprBinOp { left, right, .. }) => cmp::min(
                 ConstantLikelihood::from(&**left),
                 ConstantLikelihood::from(&**right),

crates/ruff_linter/src/rules/flake8_simplify/snapshots/ruff_linter__rules__flake8_simplify__tests__SIM300_SIM300.py.snap

@@ -269,7 +269,7 @@ SIM300.py:14:1: SIM300 [*] Yoda condition detected
    14 |+(number - 100) > 0  # SIM300
 15 15 | B<A[0][0]or B
 16 16 | B or(B)<A[0][0]
-17 17 | 
+17 17 | {"non-empty-dict": "is-ok"} == DummyHandler.CONFIG
 
 SIM300.py:15:1: SIM300 [*] Yoda condition detected
    |
@@ -278,6 +278,7 @@ SIM300.py:15:1: SIM300 [*] Yoda condition detected
 15 | B<A[0][0]or B
    | ^^^^^^^^^ SIM300
 16 | B or(B)<A[0][0]
+17 | {"non-empty-dict": "is-ok"} == DummyHandler.CONFIG
    |
    = help: Rewrite as `A[0][0] > B`
 
@@ -288,17 +289,16 @@ SIM300.py:15:1: SIM300 [*] Yoda condition detected
 15    |-B<A[0][0]or B
    15 |+A[0][0] > B or B
 16 16 | B or(B)<A[0][0]
-17 17 | 
-18 18 | # Errors in preview
+17 17 | {"non-empty-dict": "is-ok"} == DummyHandler.CONFIG
+18 18 | 
 
 SIM300.py:16:5: SIM300 [*] Yoda condition detected
    |
 14 | 0 < (number - 100)  # SIM300
 15 | B<A[0][0]or B
 16 | B or(B)<A[0][0]
    |     ^^^^^^^^^^^ SIM300
-17 | 
-18 | # Errors in preview
+17 | {"non-empty-dict": "is-ok"} == DummyHandler.CONFIG
    |
    = help: Rewrite as `A[0][0] > (B)`
 
@@ -308,46 +308,67 @@ SIM300.py:16:5: SIM300 [*] Yoda condition detected
 15 15 | B<A[0][0]or B
 16    |-B or(B)<A[0][0]
    16 |+B or A[0][0] > (B)
-17 17 | 
-18 18 | # Errors in preview
-19 19 | ['upper'] == UPPER_LIST
+17 17 | {"non-empty-dict": "is-ok"} == DummyHandler.CONFIG
+18 18 | 
+19 19 | # Errors in preview
 
-SIM300.py:19:1: SIM300 [*] Yoda condition detected
+SIM300.py:17:1: SIM300 [*] Yoda condition detected
    |
-18 | # Errors in preview
-19 | ['upper'] == UPPER_LIST
-   | ^^^^^^^^^^^^^^^^^^^^^^^ SIM300
-20 | {} == DummyHandler.CONFIG
+15 | B<A[0][0]or B
+16 | B or(B)<A[0][0]
+17 | {"non-empty-dict": "is-ok"} == DummyHandler.CONFIG
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ SIM300
+18 | 
+19 | # Errors in preview
    |
-   = help: Rewrite as `UPPER_LIST == ['upper']`
+   = help: Rewrite as `DummyHandler.CONFIG == {"non-empty-dict": "is-ok"}`
 
 ℹ Safe fix
+14 14 | 0 < (number - 100)  # SIM300
+15 15 | B<A[0][0]or B
 16 16 | B or(B)<A[0][0]
-17 17 | 
-18 18 | # Errors in preview
-19    |-['upper'] == UPPER_LIST
-   19 |+UPPER_LIST == ['upper']
-20 20 | {} == DummyHandler.CONFIG
-21 21 | 
-22 22 | # Errors in stable
+17    |-{"non-empty-dict": "is-ok"} == DummyHandler.CONFIG
+   17 |+DummyHandler.CONFIG == {"non-empty-dict": "is-ok"}
+18 18 | 
+19 19 | # Errors in preview
+20 20 | ['upper'] == UPPER_LIST
 
 SIM300.py:20:1: SIM300 [*] Yoda condition detected
    |
-18 | # Errors in preview
-19 | ['upper'] == UPPER_LIST
-20 | {} == DummyHandler.CONFIG
+19 | # Errors in preview
+20 | ['upper'] == UPPER_LIST
+   | ^^^^^^^^^^^^^^^^^^^^^^^ SIM300
+21 | {} == DummyHandler.CONFIG
+   |
+   = help: Rewrite as `UPPER_LIST == ['upper']`
+
+ℹ Safe fix
+17 17 | {"non-empty-dict": "is-ok"} == DummyHandler.CONFIG
+18 18 | 
+19 19 | # Errors in preview
+20    |-['upper'] == UPPER_LIST
+   20 |+UPPER_LIST == ['upper']
+21 21 | {} == DummyHandler.CONFIG
+22 22 | 
+23 23 | # Errors in stable
+
+SIM300.py:21:1: SIM300 [*] Yoda condition detected
+   |
+19 | # Errors in preview
+20 | ['upper'] == UPPER_LIST
+21 | {} == DummyHandler.CONFIG
    | ^^^^^^^^^^^^^^^^^^^^^^^^^ SIM300
-21 | 
-22 | # Errors in stable
+22 | 
+23 | # Errors in stable
    |
    = help: Rewrite as `DummyHandler.CONFIG == {}`
 
 ℹ Safe fix
-17 17 | 
-18 18 | # Errors in preview
-19 19 | ['upper'] == UPPER_LIST
-20    |-{} == DummyHandler.CONFIG
-   20 |+DummyHandler.CONFIG == {}
-21 21 | 
-22 22 | # Errors in stable
-23 23 | UPPER_LIST == ['upper']
+18 18 | 
+19 19 | # Errors in preview
+20 20 | ['upper'] == UPPER_LIST
+21    |-{} == DummyHandler.CONFIG
+   21 |+DummyHandler.CONFIG == {}
+22 22 | 
+23 23 | # Errors in stable
+24 24 | UPPER_LIST == ['upper']