public override void VisitWhileStatement(WhileStatement node)
{
VisitChildren(node);
var condition = node.Condition;
var body = node.EmbeddedStatement;
condition.Remove();
body.Remove();
// Special-case constant conditions
var constant = BoolConstant(condition);
if (constant == true) {
condition = null; // Convert "while (true)" => "for(;;)"
} else if (constant == false) {
node.Remove(); // Remove "while (false)"
return;
}
// Convert "while (x)" => "for (;x;)" since it's shorter and compresses better
var loop = new ForStatement();
loop.Condition = condition;
loop.EmbeddedStatement = body;
node.ReplaceWith(loop);
ReplaceBlockWithSingleStatement(body);
}
public override void VisitWhileStatement(WhileStatement e)
{
#region 删除无实际代码的循环体
//while (true)
//{
// switch (2)
// {
// case 0:
// continue;
// }
// break;
//}
//====>删除
PrimitiveExpression pe = e.Condition as PrimitiveExpression;
if (pe != null)
{
var statements = e.Descendants.OfType<Statement>().Where(x =>
!(x is BlockStatement) &&
!(x is BreakStatement) &&
!(x is ContinueStatement) &&
!(x is SwitchStatement) &&
!(x is ForStatement) &&
!(x is ForeachStatement) &&
!(x is WhileStatement) &&
!(x is DoWhileStatement) &&
!(x is IfElseStatement));
if (!statements.Any())
{
e.Remove();
return;
}
}
#endregion
base.VisitWhileStatement(e);
}
