Add ParenthesizedNode

mesonbuild/ast/visitor.py

@@ -144,3 +144,7 @@ class AstVisitor:
         for key, val in node.kwargs.items():
             key.accept(self)
             val.accept(self)
+
+    def visit_ParenthesizedNode(self, node: mparser.ParenthesizedNode) -> None:
+        self.visit_default_func(node)
+        node.inner.accept(self)

mesonbuild/interpreterbase/interpreterbase.py

@@ -239,6 +239,8 @@ class InterpreterBase:
             raise ContinueRequest()
         elif isinstance(cur, mparser.BreakNode):
             raise BreakRequest()
+        elif isinstance(cur, mparser.ParenthesizedNode):
+            return self.evaluate_statement(cur.inner)
         elif isinstance(cur, mparser.TestCaseClauseNode):
             return self.evaluate_testcase(cur)
         else:

mesonbuild/mparser.py

@@ -577,6 +577,15 @@ class TernaryNode(BaseNode):
         self.trueblock = trueblock
         self.falseblock = falseblock
 
+@dataclass(unsafe_hash=True)
+class ParenthesizedNode(BaseNode):
+
+    inner: BaseNode
+
+    def __init__(self, inner: BaseNode, lineno: int, colno: int, end_lineno: int, end_colno: int):
+        super().__init__(lineno, colno, inner.filename, end_lineno=end_lineno, end_colno=end_colno)
+        self.inner = inner
+
 if T.TYPE_CHECKING:
     COMPARISONS = Literal['==', '!=', '<', '<=', '>=', '>', 'in', 'notin']
 
@@ -778,7 +787,7 @@ class Parser:
         if self.accept('lparen'):
             e = self.statement()
             self.block_expect('rparen', block_start)
-            return e
+            return ParenthesizedNode(e, block_start.lineno, block_start.colno, self.current.lineno, self.current.colno)
         elif self.accept('lbracket'):
             args = self.args()
             self.block_expect('rbracket', block_start)

mesonbuild/optinterpreter.py

@@ -113,6 +113,8 @@ class OptionInterpreter:
     def reduce_single(self, arg: T.Union[str, mparser.BaseNode]) -> 'TYPE_var':
         if isinstance(arg, str):
             return arg
+        if isinstance(arg, mparser.ParenthesizedNode):
+            return self.reduce_single(arg.inner)
         elif isinstance(arg, (mparser.StringNode, mparser.BooleanNode,
                               mparser.NumberNode)):
             return arg.value