本文整理汇总了C#中Block.ReplaceChild方法的典型用法代码示例。如果您正苦于以下问题：C# Block.ReplaceChild方法的具体用法？C# Block.ReplaceChild怎么用？C# Block.ReplaceChild使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类Block的用法示例。
在下文中一共展示了Block.ReplaceChild方法的2个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C#代码示例。
示例1: CombineExpressions
private void CombineExpressions(Block node)
{
// walk backwards because we'll be removing items as we go along.
// and don't bother looking at the first element, because we'll be attempting to combine
// the current element with the previous element -- and the first element (0) has no
// previous element.
// we will check for:
// 1) previous=expr1; this=expr2 ==> expr1,expr2
// 2) previous=expr1; this=for(;...) ==> for(expr1;...)
// 3) previous=expr1; this=for(expr2;...) ==> for(expr1,expr2;...)
// 4) previous=expr1; this=return expr2 ==> return expr1,expr2
for (var ndx = node.Count - 1; ndx > 0; --ndx)
{
ForNode forNode;
// see if the previous statement is an expression
if (node[ndx - 1].IsExpression)
{
ReturnNode returnNode;
if (node[ndx].IsExpression)
{
// transform: expr1;expr2 to expr1,expr2
var binOp = new BinaryOperator(node[ndx - 1].Context.Clone().CombineWith(node[ndx].Context),
m_parser,
node[ndx - 1],
node[ndx],
JSToken.Comma);
// replace the current node and delete the previous
if (node.ReplaceChild(node[ndx], binOp))
{
node.ReplaceChild(node[ndx - 1], null);
}
}
else if ((returnNode = node[ndx] as ReturnNode) != null)
{
// see if the return node has an expression operand
if (returnNode.Operand != null && returnNode.Operand.IsExpression)
{
// check for expr1[ASSIGN]expr2;return expr1 and replace with return expr1[ASSIGN]expr2
var beforeExpr = node[ndx - 1] as BinaryOperator;
if (beforeExpr != null && beforeExpr.IsAssign
&& beforeExpr.Operand1.IsEquivalentTo(returnNode.Operand))
{
// tranaform: expr1[ASSIGN]expr2;return expr1 and replace with return expr1[ASSIGN]expr2
// replace the operand on the return node with the previous expression and
// delete the previous node
if (returnNode.ReplaceChild(returnNode.Operand, beforeExpr))
{
node.ReplaceChild(node[ndx - 1], null);
}
}
else
{
// transform: expr1;return expr2 to return expr1,expr2
var binOp = new BinaryOperator(null,
m_parser,
node[ndx - 1],
returnNode.Operand,
JSToken.Comma);
// replace the operand on the return node with the new expression and
// delete the previous node
if (returnNode.ReplaceChild(returnNode.Operand, binOp))
{
node.ReplaceChild(node[ndx - 1], null);
}
}
}
}
else if ((forNode = node[ndx] as ForNode) != null)
{
if (forNode.Initializer == null)
{
// transform: expr1;for(;...) to for(expr1;...)
// simply move the previous expression to the for-statement's initializer
forNode.SetInitializer(node[ndx - 1]);
node.ReplaceChild(node[ndx - 1], null);
}
else if (forNode.Initializer.IsExpression)
{
// transform: expr1;for(expr2;...) to for(expr1,expr2;...)
var binOp = new BinaryOperator(null,
m_parser,
node[ndx - 1],
forNode.Initializer,
JSToken.Comma);
// replace the initializer with the new binary operator and remove the previous node
if (forNode.ReplaceChild(forNode.Initializer, binOp))
{
node.ReplaceChild(node[ndx - 1], null);
}
}
}
}
}
}示例2: Visit
public override void Visit(Block node)
{
if (node != null)
{
// we might things differently if these statements are the body collection for a function
// because we can assume the implicit return statement at the end of it
bool isFunctionLevel = (node.Parent is FunctionObject);
// if we want to remove debug statements...
if (m_parser.Settings.StripDebugStatements && m_parser.Settings.IsModificationAllowed(TreeModifications.StripDebugStatements))
{
// do it now before we try doing other things
StripDebugStatements(node);
}
// analyze all the statements in our block and recurse them
if (node.BlockScope != null)
{
ScopeStack.Push(node.BlockScope);
}
try
{
// call the base class to recurse
base.Visit(node);
}
finally
{
if (node.BlockScope != null)
{
ScopeStack.Pop();
}
}
if (m_parser.Settings.RemoveUnneededCode)
{
// go forward, and check the count each iteration because we might be ADDING statements to the block.
// let's look at all our if-statements. If a true-clause ends in a return, then we don't
// need the else-clause; we can pull its statements out and stick them after the if-statement.
// also, if we encounter a return-, break- or continue-statement, we can axe everything after it
for (var ndx = 0; ndx < node.Count; ++ndx)
{
// see if it's an if-statement with both a true and a false block
var ifNode = node[ndx] as IfNode;
if (ifNode != null
&& ifNode.TrueBlock != null
&& ifNode.TrueBlock.Count > 0
&& ifNode.FalseBlock != null)
{
// now check to see if the true block ends in a return statement
if (ifNode.TrueBlock[ifNode.TrueBlock.Count - 1] is ReturnNode)
{
// transform: if(cond){statements1;return}else{statements2} to if(cond){statements1;return}statements2
// it does. insert all the false-block statements after the if-statement
node.InsertRange(ndx + 1, ifNode.FalseBlock.Children);
// and then remove the false block altogether
ifNode.ReplaceChild(ifNode.FalseBlock, null);
}
}
else if (node[ndx] is ReturnNode
|| node[ndx] is Break
|| node[ndx] is ContinueNode)
{
// we have a return node -- no statments afterwards will be executed, so clear them out.
// transform: {...;return;...} to {...;return}
// transform: {...;break;...} to {...;break}
// transform: {...;continue;...} to {...;continue}
// we've found a return statement, and it's not the last statement in the function.
// walk the rest of the statements and delete anything that isn't a function declaration
// or a var statement.
for (var ndxRemove = node.Count - 1; ndxRemove > ndx; --ndxRemove)
{
var funcObject = node[ndxRemove] as FunctionObject;
if (funcObject == null || funcObject.FunctionType != FunctionType.Declaration)
{
var varStatement = node[ndxRemove] as Var;
if (varStatement != null)
{
// var statements can't be removed, but any initializers should
// be deleted since they won't get executed.
for (var ndxDecl = 0; ndxDecl < varStatement.Count; ++ndxDecl)
{
if (varStatement[ndxDecl].Initializer != null)
{
varStatement[ndxDecl].ReplaceChild(varStatement[ndxDecl].Initializer, null);
}
}
}
else
{
// not a function declaration, and not a var statement -- get rid of it
node.RemoveAt(ndxRemove);
}
}
}
}
}
}
// now check the last statement -- if it's an if-statement where the true-block is a single return
//.........这里部分代码省略.........