private AST ParseUnaryExpression(out bool isLeftHandSideExpr, ref bool canBeAttribute, bool isMinus, bool warnForKeyword){
AST ast = null;
isLeftHandSideExpr = false;
bool dummy = false;
Context exprCtx = null;
AST expr = null;
switch (this.currentToken.token){
case JSToken.Void:
exprCtx = this.currentToken.Clone();
GetNextToken();
canBeAttribute = false;
expr = ParseUnaryExpression(out dummy, ref canBeAttribute, false);
exprCtx.UpdateWith(expr.context);
ast = new VoidOp(exprCtx, expr);
break;
case JSToken.Typeof:
exprCtx = this.currentToken.Clone();
GetNextToken();
canBeAttribute = false;
expr = ParseUnaryExpression(out dummy, ref canBeAttribute, false);
exprCtx.UpdateWith(expr.context);
ast = new Typeof(exprCtx, expr);
break;
case JSToken.Plus:
exprCtx = this.currentToken.Clone();
GetNextToken();
canBeAttribute = false;
expr = ParseUnaryExpression(out dummy, ref canBeAttribute, false);
exprCtx.UpdateWith(expr.context);
ast = new NumericUnary(exprCtx, expr, JSToken.Plus);
break;
case JSToken.Minus:
exprCtx = this.currentToken.Clone();
GetNextToken();
canBeAttribute = false;
expr = ParseUnaryExpression(out dummy, ref canBeAttribute, true);
// deal with '-floatNumber' being parsed as a single entity (NumericLiteral) and not as a -NumericLiteral
if (expr.context.token == JSToken.NumericLiteral){
exprCtx.UpdateWith(expr.context);
expr.context = exprCtx;
ast = expr;
}else{
exprCtx.UpdateWith(expr.context);
ast = new NumericUnary(exprCtx, expr, JSToken.Minus);
}
break;
case JSToken.BitwiseNot:
exprCtx = this.currentToken.Clone();
GetNextToken();
canBeAttribute = false;
expr = ParseUnaryExpression(out dummy, ref canBeAttribute, false);
exprCtx.UpdateWith(expr.context);
ast = new NumericUnary(exprCtx, expr, JSToken.BitwiseNot);
break;
case JSToken.LogicalNot:
exprCtx = this.currentToken.Clone();
GetNextToken();
canBeAttribute = false;
expr = ParseUnaryExpression(out dummy, ref canBeAttribute, false);
exprCtx.UpdateWith(expr.context);
ast = new NumericUnary(exprCtx, expr, JSToken.LogicalNot);
break;
case JSToken.Delete:
exprCtx = this.currentToken.Clone();
GetNextToken();
canBeAttribute = false;
expr = ParseUnaryExpression(out dummy, ref canBeAttribute, false);
exprCtx.UpdateWith(expr.context);
ast = new Delete(exprCtx, expr);
break;
case JSToken.Increment:
exprCtx = this.currentToken.Clone();
GetNextToken();
canBeAttribute = false;
expr = ParseUnaryExpression(out dummy, ref canBeAttribute, false);
exprCtx.UpdateWith(expr.context);
ast = new PostOrPrefixOperator(exprCtx, expr, PostOrPrefix.PrefixIncrement);
break;
case JSToken.Decrement:
exprCtx = this.currentToken.Clone();
GetNextToken();
canBeAttribute = false;
expr = ParseUnaryExpression(out dummy, ref canBeAttribute, false);
exprCtx.UpdateWith(expr.context);
ast = new PostOrPrefixOperator(exprCtx, expr, PostOrPrefix.PrefixDecrement);
break;
default:
this.noSkipTokenSet.Add(NoSkipTokenSet.s_PostfixExpressionNoSkipTokenSet);
try{
ast = ParseLeftHandSideExpression(isMinus, ref canBeAttribute, warnForKeyword);
}catch(RecoveryTokenException exc){
if (IndexOfToken(NoSkipTokenSet.s_PostfixExpressionNoSkipTokenSet, exc) == -1){
throw exc;
}else{
if (exc._partiallyComputedNode == null)
SkipTokensAndThrow();
else
ast = exc._partiallyComputedNode;
}
}finally{
this.noSkipTokenSet.Remove(NoSkipTokenSet.s_PostfixExpressionNoSkipTokenSet);
}
ast = ParsePostfixExpression(ast, out isLeftHandSideExpr, ref canBeAttribute);
break;
}
dummy = dummy;
return ast;
}
private AST ParsePostfixExpression(AST ast, out bool isLeftHandSideExpr, ref bool canBeAttribute){
isLeftHandSideExpr = true;
Context exprCtx = null;
if (null != ast){
if (!this.scanner.GotEndOfLine()){
if (JSToken.Increment == this.currentToken.token){
isLeftHandSideExpr = false;
exprCtx = ast.context.Clone();
exprCtx.UpdateWith(this.currentToken);
canBeAttribute = false;
ast = new PostOrPrefixOperator(exprCtx, ast, PostOrPrefix.PostfixIncrement);
GetNextToken();
}else if (JSToken.Decrement == this.currentToken.token){
isLeftHandSideExpr = false;
exprCtx = ast.context.Clone();
exprCtx.UpdateWith(this.currentToken);
canBeAttribute = false;
ast = new PostOrPrefixOperator(exprCtx, ast, PostOrPrefix.PostfixDecrement);
GetNextToken();
}
}
}
return ast;
}
private AST ParseUnaryExpression(out bool isLeftHandSideExpr, ref bool canBeAttribute, bool isMinus, bool warnForKeyword)
{
AST ast = null;
isLeftHandSideExpr = false;
bool flag = false;
Context context = null;
AST operand = null;
switch (this.currentToken.token)
{
case JSToken.FirstOp:
context = this.currentToken.Clone();
this.GetNextToken();
canBeAttribute = false;
operand = this.ParseUnaryExpression(out flag, ref canBeAttribute, false);
context.UpdateWith(operand.context);
ast = new NumericUnary(context, operand, JSToken.FirstOp);
break;
case JSToken.BitwiseNot:
context = this.currentToken.Clone();
this.GetNextToken();
canBeAttribute = false;
operand = this.ParseUnaryExpression(out flag, ref canBeAttribute, false);
context.UpdateWith(operand.context);
ast = new NumericUnary(context, operand, JSToken.BitwiseNot);
break;
case JSToken.Delete:
context = this.currentToken.Clone();
this.GetNextToken();
canBeAttribute = false;
operand = this.ParseUnaryExpression(out flag, ref canBeAttribute, false);
context.UpdateWith(operand.context);
ast = new Delete(context, operand);
break;
case JSToken.Void:
context = this.currentToken.Clone();
this.GetNextToken();
canBeAttribute = false;
operand = this.ParseUnaryExpression(out flag, ref canBeAttribute, false);
context.UpdateWith(operand.context);
ast = new VoidOp(context, operand);
break;
case JSToken.Typeof:
context = this.currentToken.Clone();
this.GetNextToken();
canBeAttribute = false;
operand = this.ParseUnaryExpression(out flag, ref canBeAttribute, false);
context.UpdateWith(operand.context);
ast = new Typeof(context, operand);
break;
case JSToken.Increment:
context = this.currentToken.Clone();
this.GetNextToken();
canBeAttribute = false;
operand = this.ParseUnaryExpression(out flag, ref canBeAttribute, false);
context.UpdateWith(operand.context);
ast = new PostOrPrefixOperator(context, operand, PostOrPrefix.PrefixIncrement);
break;
case JSToken.Decrement:
context = this.currentToken.Clone();
this.GetNextToken();
canBeAttribute = false;
operand = this.ParseUnaryExpression(out flag, ref canBeAttribute, false);
context.UpdateWith(operand.context);
ast = new PostOrPrefixOperator(context, operand, PostOrPrefix.PrefixDecrement);
break;
case JSToken.FirstBinaryOp:
context = this.currentToken.Clone();
this.GetNextToken();
canBeAttribute = false;
operand = this.ParseUnaryExpression(out flag, ref canBeAttribute, false);
context.UpdateWith(operand.context);
ast = new NumericUnary(context, operand, JSToken.FirstBinaryOp);
break;
case JSToken.Minus:
context = this.currentToken.Clone();
this.GetNextToken();
canBeAttribute = false;
operand = this.ParseUnaryExpression(out flag, ref canBeAttribute, true);
if (operand.context.token != JSToken.NumericLiteral)
{
context.UpdateWith(operand.context);
ast = new NumericUnary(context, operand, JSToken.Minus);
break;
}
context.UpdateWith(operand.context);
operand.context = context;
ast = operand;
break;
default:
this.noSkipTokenSet.Add(NoSkipTokenSet.s_PostfixExpressionNoSkipTokenSet);
try
{
ast = this.ParseLeftHandSideExpression(isMinus, ref canBeAttribute, warnForKeyword);
}
catch (RecoveryTokenException exception)
{
if (this.IndexOfToken(NoSkipTokenSet.s_PostfixExpressionNoSkipTokenSet, exception) == -1)
{
throw exception;
}
if (exception._partiallyComputedNode == null)
{
this.SkipTokensAndThrow();
}
else
{
ast = exception._partiallyComputedNode;
}
}
finally
{
this.noSkipTokenSet.Remove(NoSkipTokenSet.s_PostfixExpressionNoSkipTokenSet);
}
ast = this.ParsePostfixExpression(ast, out isLeftHandSideExpr, ref canBeAttribute);
break;
}
return ast;
}