diff options
Diffstat (limited to 'src/cmd/compile/internal/syntax/parser.go')
| -rw-r--r-- | src/cmd/compile/internal/syntax/parser.go | 17 |
1 files changed, 13 insertions, 4 deletions
diff --git a/src/cmd/compile/internal/syntax/parser.go b/src/cmd/compile/internal/syntax/parser.go index c8b8ab0601..b5602fcff7 100644 --- a/src/cmd/compile/internal/syntax/parser.go +++ b/src/cmd/compile/internal/syntax/parser.go @@ -2369,10 +2369,8 @@ done: // further confusion. var str string if as, ok := s.(*AssignStmt); ok && as.Op == 0 { - // Emphasize Lhs and Rhs of assignment with parentheses to highlight '='. - // Do it always - it's not worth going through the trouble of doing it - // only for "complex" left and right sides. - str = "assignment (" + String(as.Lhs) + ") = (" + String(as.Rhs) + ")" + // Emphasize complex Lhs and Rhs of assignment with parentheses to highlight '='. + str = "assignment " + emphasize(as.Lhs) + " = " + emphasize(as.Rhs) } else { str = String(s) } @@ -2383,6 +2381,17 @@ done: return } +// emphasize returns a string representation of x, with (top-level) +// binary expressions emphasized by enclosing them in parentheses. +func emphasize(x Expr) string { + s := String(x) + if op, _ := x.(*Operation); op != nil && op.Y != nil { + // binary expression + return "(" + s + ")" + } + return s +} + func (p *parser) ifStmt() *IfStmt { if trace { defer p.trace("ifStmt")() |