改行時の演算子が後置であることをチェックできるようにする

Script/CI/check_coding_rule.py

@@ -47,6 +47,7 @@ def main():
         check_operator_space_,
         check_preprocessor_,
         check_include_guard_,
+        check_binary_operator_before_linebreak_,
     ]
     check_funcs = []
 
@@ -678,6 +679,23 @@ def check_include_guard_(path: str, code_lines: list) -> bool:
     return False
 
 
+def check_binary_operator_before_linebreak_(path: str, code_lines: list) -> bool:
+    ptn = r'^\s*([+\-*/%]|<<|>>|<=|>=|==|!=|&{1,2}|\|{1,2}|\^)\s+'
+    reptn = re.compile(ptn)
+    for idx, line in enumerate(code_lines):
+        if is_in_comment_context_in_multiline_(path, code_lines, idx):
+            continue
+
+        matched = reptn.match(line)
+        if matched is None:
+            continue
+
+        print_err_(path, idx, f'LINE {idx} HAS STARTED WITH THE OPERATOR {matched.group(1)}.', line)
+        return False
+
+    return True
+
+
 # True: target が含まれる, False: なし
 def is_contained_pattern_(line: str, target: str) -> bool:
     pos = 0