[clang-tools-extra] Add clang-tidy check readability-math-missing-parentheses (PR #84481)

[Piotr Zegar via cfe-commits]

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@@ -0,0 +1,42 @@
+// RUN: %check_clang_tidy %s readability-math-missing-parentheses %t
+
+// FIXME: Add something that triggers the check here.
+void f(){
+    //CHECK-MESSAGES: :[[@LINE+2]]:13: warning: add parantheses to clarify the precedence of operations [readability-math-missing-parentheses]
+    //CHECK-FIXES: int a = 1 + (2 * 3);
+    int a = 1 + 2 * 3; 
+
+    int b = 1 + 2 + 3; // No warning
+
+    int c = 1 * 2 * 3; // No warning
+
+    //CHECK-MESSAGES: :[[@LINE+2]]:13: warning: add parantheses to clarify the precedence of operations [readability-math-missing-parentheses]
+    //CHECK-FIXES: int d = (1 + (2 * 3)) - (4 / 5);
+    int d = 1 + 2 * 3 - 4 / 5;
+
+    //CHECK-MESSAGES: :[[@LINE+2]]:13: warning: add parantheses to clarify the precedence of operations [readability-math-missing-parentheses]
+    //CHECK-FIXES: int e = (1 & (2 + 3)) | (4 * 5);
+    int e = 1 & 2 + 3 | 4 * 5;
+
+    //CHECK-MESSAGES: :[[@LINE+2]]:13: warning: add parantheses to clarify the precedence of operations [readability-math-missing-parentheses]
+    //CHECK-FIXES: int f = (1 * -2) + 4;
+    int f = 1 * -2 + 4;
+
+    //CHECK-MESSAGES: :[[@LINE+2]]:13: warning: add parantheses to clarify the precedence of operations [readability-math-missing-parentheses]
+    //CHECK-FIXES: int g = (((1 * 2) * 3) + 4) + 5;
+    int g = 1 * 2 * 3 + 4 + 5;
+
+    // CHECK-MESSAGES: :[[@LINE+2]]:13: warning: add parantheses to clarify the precedence of operations [readability-math-missing-parentheses]
+    // CHECK-FIXES: int h = (120 & (2 + 3)) | (22 * 5);
+    int h = 120 & 2 + 3 | 22 * 5;
+
+    int i = 1 & 2 & 3; // No warning
+
+    int j = 1 | 2 | 3; // No warning
+
+    int k = 1 ^ 2 ^ 3; // No warning
+
+    // CHECK-MESSAGES: :[[@LINE+2]]:13: warning: add parantheses to clarify the precedence of operations [readability-math-missing-parentheses]
+    // CHECK-FIXES: int l = (1 + 2) ^ 3;
+    int l = 1 + 2 ^ 3;
+}
----------------
PiotrZSL wrote:

missing tests with function calls, with strings, with implicit casts like `1.0 * 5`.
Missing support for overloaded operators.

https://github.com/llvm/llvm-project/pull/84481