+void Formatter::visit(Block &block)
+{
+ unsigned brace_indent = indent;
+ bool use_braces = (block.use_braces || (indent && block.body.size()!=1));
+ if(use_braces)
+ append(format("%s{\n", string(brace_indent*2, ' ')));
+
+ SetForScope<unsigned> set(indent, indent+(indent>0 || use_braces));
+ string spaces(indent*2, ' ');
+ bool first = true;
+ for(NodeList<Statement>::iterator i=block.body.begin(); i!=block.body.end(); ++i)
+ {
+ if(omit_builtin && (*i)->source<=BUILTIN_SOURCE)
+ continue;
+ if(!first)
+ append('\n');
+ first = false;
+ set_source((*i)->source, (*i)->line);
+ append(spaces);
+ (*i)->visit(*this);
+ }
+
+ if(use_braces)
+ append(format("\n%s}", string(brace_indent*2, ' ')));
+}
+
+void Formatter::visit_expression(Expression &expr, const Operator *outer_oper, bool on_rhs)
+{
+ unsigned outer_precedence = (outer_oper ? outer_oper->precedence : 20);
+ unsigned inner_precedence = (expr.oper ? expr.oper->precedence : 0);
+
+ bool needs_parentheses = (inner_precedence>=outer_precedence);
+
+ // Omit parentheses if the outer operator encloses this operand.
+ if(outer_oper && outer_oper->type==Operator::BINARY && outer_oper->token2[0] && on_rhs)
+ needs_parentheses = false;
+
+ if(expr.oper)
+ {
+ /* Omit parentheses if the inner expression's operator sits between the
+ expression and the outer operator. */
+ bool oper_on_left = expr.oper->type==Operator::PREFIX;
+ bool oper_on_right = expr.oper->type==Operator::POSTFIX || (expr.oper->type==Operator::BINARY && expr.oper->token2[0]);
+ if(expr.oper && ((oper_on_left && on_rhs) || (oper_on_right && !on_rhs)))
+ needs_parentheses = false;
+
+ // Omit parentheses if the operator's natural grouping works out.
+ if(expr.oper==outer_oper)
+ needs_parentheses = (expr.oper->assoc!=Operator::ASSOCIATIVE && on_rhs!=(expr.oper->assoc==Operator::RIGHT_TO_LEFT));
+ }
+
+ if(needs_parentheses)
+ append('(');
+ expr.visit(*this);
+ if(needs_parentheses)
+ append(')');
+}
+