Revert "remove NODE_PARENEXPR"

This reverts commit 8760e9f.

Author: itchyny

autoload/vimlparser.vim

@@ -142,6 +142,7 @@ let s:NODE_CONST = 94
 let s:NODE_EVAL = 95
 let s:NODE_HEREDOC = 96
 let s:NODE_METHOD = 97
+let s:NODE_PARENEXPR = 200
 
 let s:TOKEN_EOF = 1
 let s:TOKEN_EOL = 2
@@ -4312,7 +4313,9 @@ function! s:ExprParser.parse_expr9() abort
     endwhile
     return node
   elseif token.type ==# s:TOKEN_POPEN
-    let node = self.parse_expr1()
+    let node = s:Node(s:NODE_PARENEXPR)
+    let node.pos = token.pos
+    let node.value = self.parse_expr1()
     let token = self.tokenizer.get()
     if token.type !=# s:TOKEN_PCLOSE
       throw s:Err(printf('unexpected token: %s', token.value), token.pos)

go/export.go

@@ -479,6 +479,13 @@ func newAstNode(n *VimNode, filename string) ast.Node {
 			Body:      newExprs(n.body, filename),
 		}
 
+	case NODE_PARENEXPR:
+		n := n.value.(*VimNode)
+		return &ast.ParenExpr{
+			Lparen: pos,
+			X:      newExprNode(n, filename),
+		}
+
 	}
 	panic(fmt.Errorf("Unknown node type: %v, node: %v", n.type_, n))
 }

go/gocompiler.vim

@@ -6,6 +6,7 @@ call extend(s:, vimlparser#import())
 
 let s:opprec = {}
 let s:opprec[s:NODE_TERNARY] = 1
+let s:opprec[s:NODE_PARENEXPR] = 1
 let s:opprec[s:NODE_OR] = 2
 let s:opprec[s:NODE_AND] = 3
 let s:opprec[s:NODE_EQUAL] = 4
@@ -280,6 +281,8 @@ function s:GoCompiler.compile(node)
     return self.compile_env(a:node)
   elseif a:node.type == s:NODE_REG
     return self.compile_reg(a:node)
+  elseif a:node.type == s:NODE_PARENEXPR
+    return self.compile_parenexpr(a:node)
   else
     throw self.err('Compiler: unknown node: %s', string(a:node))
   endif