public void Visit(BinaryExpression expression)
{
expression.LeftExpression.Accept(this);
Builder.Append(' ');
switch (expression.Type)
{
case BinaryExpressionType.And:
Builder.Append("&&");
break;
case BinaryExpressionType.Or:
Builder.Append("||");
break;
case BinaryExpressionType.NotEqual:
Builder.Append("!=");
break;
case BinaryExpressionType.LesserOrEqual:
Builder.Append("<=");
break;
case BinaryExpressionType.GreaterOrEqual:
Builder.Append(">=");
break;
case BinaryExpressionType.Lesser:
Builder.Append("<");
break;
case BinaryExpressionType.Greater:
Builder.Append(">");
break;
case BinaryExpressionType.Equal:
Builder.Append("");
break;
case BinaryExpressionType.Minus:
Builder.Append("-");
break;
case BinaryExpressionType.Plus:
Builder.Append("+");
break;
case BinaryExpressionType.Modulo:
Builder.Append("%");
break;
case BinaryExpressionType.Div:
Builder.Append("/");
break;
case BinaryExpressionType.Times:
Builder.Append("*");
break;
case BinaryExpressionType.Pow:
Builder.Append("**");
break;
case BinaryExpressionType.BitwiseAnd:
Builder.Append("&");
break;
case BinaryExpressionType.BitwiseOr:
Builder.Append("|");
break;
case BinaryExpressionType.BitwiseXOr:
Builder.Append("^");
break;
case BinaryExpressionType.Same:
Builder.Append("===");
break;
case BinaryExpressionType.NotSame:
Builder.Append("!===");
break;
case BinaryExpressionType.LeftShift:
Builder.Append("<<");
break;
case BinaryExpressionType.RightShift:
Builder.Append(">>");
break;
case BinaryExpressionType.UnsignedRightShift:
Builder.Append(">>>");
break;
case BinaryExpressionType.InstanceOf:
Builder.Append("instanceof");
break;
case BinaryExpressionType.In:
Builder.Append("in");
break;
case BinaryExpressionType.Unknown:
Builder.Append(" /* unknown */");
break;
default:
throw new ArgumentOutOfRangeException();
}
Builder.Append(' ');
expression.RightExpression.Accept(this);
}
public void Visit(BinaryExpression expression)
{
JsInstance old = Result;
// Evaluates the left expression and saves the value
expression.LeftExpression.Accept(this);
JsInstance left = Result;
//prevents execution of the right hand side if false
if (expression.Type == BinaryExpressionType.And && !left.ToBoolean())
{
Result = left;
return;
}
//prevents execution of the right hand side if true
if (expression.Type == BinaryExpressionType.Or && left.ToBoolean())
{
Result = left;
return;
}
Result = null;
// Evaluates the right expression and saves the value
expression.RightExpression.Accept(this);
JsInstance right = Result;
Result = old;
switch (expression.Type)
{
case BinaryExpressionType.And:
if (left.ToBoolean())
{
Result = right;
}
else
{
Result = JsBoolean.False;
}
break;
case BinaryExpressionType.Or:
if (left.ToBoolean())
{
Result = left;
}
else
{
Result = right;
}
break;
case BinaryExpressionType.Div:
var rightNumber = right.ToNumber();
var leftNumber = left.ToNumber();
if (right == Global.NumberClass["NEGATIVE_INFINITY"] || right == Global.NumberClass["POSITIVE_INFINITY"])
{
Result = new JsNumber(0);
}
else if (rightNumber == 0)
{
Result = leftNumber > 0 ? Global.NumberClass["POSITIVE_INFINITY"] : Global.NumberClass["NEGATIVE_INFINITY"];
}
else
{
Result = Global.NumberClass.New(leftNumber / rightNumber);
}
break;
case BinaryExpressionType.Equal:
if (left == JsUndefined.Instance && right == JsUndefined.Instance || left == JsNull.Instance && right == JsNull.Instance)
{
Result = JsBoolean.True;
}
else
{
if (left == JsUndefined.Instance && right != JsUndefined.Instance || left == JsNull.Instance && right != JsNull.Instance)
{
Result = JsBoolean.False;
}
else
if (left != JsUndefined.Instance && right == JsUndefined.Instance || left != JsNull.Instance && right == JsNull.Instance)
{
Result = JsBoolean.False;
}
else
{
if (left.Class == JsNumber.TYPEOF || left.Class == JsBoolean.TYPEOF ||
right.Class == JsNumber.TYPEOF || right.Class == JsBoolean.TYPEOF)
{
Result = Global.BooleanClass.New(left.ToNumber() == right.ToNumber());
}
else if (left.Class == JsString.TYPEOF || right.Class == JsString.TYPEOF)
{
Result = Global.BooleanClass.New(left.ToString() == right.ToString());
}
else if (left.Value != null)
{
Result = Global.BooleanClass.New(left.Value.Equals(right.Value));
}
else
{
Result = Global.BooleanClass.New(left == right);
}
}
}
break;
case BinaryExpressionType.Greater:
// Use the type of the left operand to make the comparison
Result = Global.BooleanClass.New(left.ToNumber() > right.ToNumber());
break;
case BinaryExpressionType.GreaterOrEqual:
// Use the type of the left operand to make the comparison
Result = Global.BooleanClass.New(left.ToNumber() >= right.ToNumber());
break;
case BinaryExpressionType.Lesser:
// Use the type of the left operand to make the comparison
Result = Global.BooleanClass.New(left.ToNumber() < right.ToNumber());
break;
case BinaryExpressionType.LesserOrEqual:
// Use the type of the left operand to make the comparison
Result = Global.BooleanClass.New(left.ToNumber() <= right.ToNumber());
break;
case BinaryExpressionType.Minus:
Result = Global.NumberClass.New(left.ToNumber() - right.ToNumber());
break;
case BinaryExpressionType.Modulo:
if (right == Global.NumberClass["NEGATIVE_INFINITY"] || right == Global.NumberClass["POSITIVE_INFINITY"])
{
Result = Global.NumberClass["POSITIVE_INFINITY"];
}
else if (right.ToNumber() == 0)
{
Result = Global.NumberClass["NaN"];
}
else
{
Result = Global.NumberClass.New(left.ToNumber() % right.ToNumber());
}
break;
case BinaryExpressionType.NotEqual:
if (left == JsUndefined.Instance && right == JsUndefined.Instance || left == JsNull.Instance && right == JsNull.Instance)
{
Result = JsBoolean.False;
}
else
{
if (left == JsUndefined.Instance && right != JsUndefined.Instance || left == JsNull.Instance && right != JsNull.Instance)
{
Result = JsBoolean.True;
}
else
if (left != JsUndefined.Instance && right == JsUndefined.Instance || left != JsNull.Instance && right == JsNull.Instance)
{
Result = JsBoolean.True;
}
else
{
Result = Global.BooleanClass.New(!left.Value.Equals(right.Value));
}
}
break;
case BinaryExpressionType.Plus:
if (left.Class == JsString.TYPEOF || right.Class == JsString.TYPEOF)
{
Result = Global.StringClass.New(String.Concat(left.ToString(), right.ToString()));
}
else
{
Result = Global.NumberClass.New(left.ToNumber() + right.ToNumber());
}
break;
case BinaryExpressionType.Times:
Result = Global.NumberClass.New(left.ToNumber() * right.ToNumber());
break;
case BinaryExpressionType.Pow:
Result = Global.NumberClass.New(Math.Pow(left.ToNumber(), right.ToNumber()));
break;
case BinaryExpressionType.BitwiseAnd:
Result = Global.NumberClass.New(Convert.ToUInt64(left.ToNumber()) & Convert.ToUInt64(right.ToNumber()));
break;
case BinaryExpressionType.BitwiseOr:
Result = Global.NumberClass.New(Convert.ToUInt64(left.ToNumber()) | Convert.ToUInt64(right.ToNumber()));
break;
case BinaryExpressionType.BitwiseXOr:
Result = Global.NumberClass.New(Convert.ToUInt64(left.ToNumber()) ^ Convert.ToUInt64(right.ToNumber()));
break;
case BinaryExpressionType.Same:
// 11.9.6 The Strict Equality Comparison Algorithm
if (left.Class != right.Class)
{
Result = JsBoolean.False;
}
else if (left.Class == JsUndefined.TYPEOF)
{
Result = JsBoolean.True;
}
else if (left.Class == JsNull.TYPEOF)
{
Result = JsBoolean.True;
}
else if (left.Class == JsNumber.TYPEOF)
{
if (left == Global.NumberClass["NaN"] || right == Global.NumberClass["NaN"])
{
Result = JsBoolean.False;
}
else if (left.ToNumber() == right.ToNumber())
{
Result = JsBoolean.True;
}
else
Result = JsBoolean.False;
}
else if (left.Class == JsString.TYPEOF)
{
Result = new JsBoolean(left.ToString() == right.ToString());
}
else if (left.Class == JsBoolean.TYPEOF)
{
Result = new JsBoolean(left.ToBoolean() == right.ToBoolean());
}
else if (left == right)
{
Result = JsBoolean.True;
}
else
{
Result = JsBoolean.False;
}
break;
case BinaryExpressionType.NotSame:
new BinaryExpression(BinaryExpressionType.Same, expression.LeftExpression, expression.RightExpression).Accept(this);
Result = new JsBoolean(!Result.ToBoolean());
break;
case BinaryExpressionType.LeftShift:
Result = Global.NumberClass.New(Convert.ToUInt64(left.ToNumber()) << Convert.ToUInt16(right.ToNumber()));
break;
case BinaryExpressionType.RightShift:
Result = Global.NumberClass.New(Convert.ToUInt64(left.ToNumber()) >> Convert.ToUInt16(right.ToNumber()));
break;
case BinaryExpressionType.UnsignedRightShift:
Result = Global.NumberClass.New(Convert.ToUInt64(left.ToNumber()) >> Convert.ToUInt16(right.ToNumber()));
break;
case BinaryExpressionType.InstanceOf:
Result = new JsBoolean(left.Class == right.ToString());
break;
case BinaryExpressionType.In:
if (right is JsDictionaryObject)
{
((JsDictionaryObject)right).HasProperty(left);
}
else
{
throw new JintException("Cannot apply 'in' operator to the specified member.");
}
break;
default:
throw new NotSupportedException("Unkown binary operator");
}
}
public void Visit(BinaryExpression expression)
{
// Evaluates the left expression and saves the value
expression.LeftExpression.Accept(this);
EnsureIdentifierIsDefined(Result);
JsInstance left = Result;
//prevents execution of the right hand side if false
if (expression.Type == BinaryExpressionType.And && !left.ToBoolean()) {
Result = left;
return;
}
//prevents execution of the right hand side if true
if (expression.Type == BinaryExpressionType.Or && left.ToBoolean()) {
Result = left;
return;
}
// Evaluates the right expression and saves the value
expression.RightExpression.Accept(this);
EnsureIdentifierIsDefined(Result);
JsInstance right = Result;
int cmpResult;
switch (expression.Type) {
case BinaryExpressionType.And:
if (left.ToBoolean()) {
Result = right;
}
else {
Result = Global.BooleanClass.False;
}
break;
case BinaryExpressionType.Or:
if (left.ToBoolean()) {
Result = left;
}
else {
Result = right;
}
break;
case BinaryExpressionType.Div:
var rightNumber = right.ToNumber();
var leftNumber = left.ToNumber();
if (right == Global.NumberClass["NEGATIVE_INFINITY"] || right == Global.NumberClass["POSITIVE_INFINITY"]) {
Result = Global.NumberClass.New(0);
}
else if (rightNumber == 0) {
Result = leftNumber > 0 ? Global.NumberClass["POSITIVE_INFINITY"] : Global.NumberClass["NEGATIVE_INFINITY"];
}
else {
Result = Global.NumberClass.New(leftNumber / rightNumber);
}
break;
case BinaryExpressionType.Equal:
Result = Compare(left, right);
break;
case BinaryExpressionType.Greater:
Result = CompareTo(left,right,out cmpResult) && cmpResult > 0 ? Global.BooleanClass.True : Global.BooleanClass.False ;
break;
case BinaryExpressionType.GreaterOrEqual:
Result = CompareTo(left, right, out cmpResult) && cmpResult >= 0 ? Global.BooleanClass.True : Global.BooleanClass.False;
break;
case BinaryExpressionType.Lesser:
Result = CompareTo(left, right, out cmpResult) && cmpResult < 0 ? Global.BooleanClass.True : Global.BooleanClass.False;
break;
case BinaryExpressionType.LesserOrEqual:
Result = CompareTo(left, right, out cmpResult) && cmpResult <= 0 ? Global.BooleanClass.True : Global.BooleanClass.False;
break;
case BinaryExpressionType.Minus:
Result = Global.NumberClass.New(left.ToNumber() - right.ToNumber());
break;
case BinaryExpressionType.Modulo:
if (right == Global.NumberClass["NEGATIVE_INFINITY"] || right == Global.NumberClass["POSITIVE_INFINITY"]) {
Result = Global.NumberClass["POSITIVE_INFINITY"];
}
else if (right.ToNumber() == 0) {
Result = Global.NumberClass["NaN"];
}
else {
Result = Global.NumberClass.New(left.ToNumber() % right.ToNumber());
}
break;
case BinaryExpressionType.NotEqual:
Result = Global.BooleanClass.New(!Compare(left, right).ToBoolean());
break;
case BinaryExpressionType.Plus:
if (left.Class == JsInstance.CLASS_STRING || right.Class == JsInstance.CLASS_STRING)
{
Result = Global.StringClass.New(String.Concat(left.ToString(), right.ToString()));
}
else {
Result = Global.NumberClass.New(left.ToNumber() + right.ToNumber());
}
break;
case BinaryExpressionType.Times:
Result = Global.NumberClass.New(left.ToNumber() * right.ToNumber());
break;
case BinaryExpressionType.Pow:
Result = Global.NumberClass.New(Math.Pow(left.ToNumber(), right.ToNumber()));
break;
case BinaryExpressionType.BitwiseAnd:
if (left == JsUndefined.Instance || right == JsUndefined.Instance)
Result = Global.NumberClass.New(0);
else
Result = Global.NumberClass.New(Convert.ToInt64(left.ToNumber()) & Convert.ToInt64(right.ToNumber()));
break;
case BinaryExpressionType.BitwiseOr:
if (left == JsUndefined.Instance) {
if(right == JsUndefined.Instance)
Result = Global.NumberClass.New(1);
else
Result = Global.NumberClass.New(Convert.ToInt64(right.ToNumber()));
}
else if (right == JsUndefined.Instance)
Result = Global.NumberClass.New(Convert.ToInt64(left.ToNumber()));
else
Result = Global.NumberClass.New(Convert.ToInt64(left.ToNumber()) | Convert.ToInt64(right.ToNumber()));
break;
case BinaryExpressionType.BitwiseXOr:
if (left == JsUndefined.Instance) {
if(right == JsUndefined.Instance)
Result = Global.NumberClass.New(1);
else
Result = Global.NumberClass.New(Convert.ToInt64(right.ToNumber()));
}
else if (right == JsUndefined.Instance)
Result = Global.NumberClass.New(Convert.ToInt64(left.ToNumber()));
else
Result = Global.NumberClass.New(Convert.ToInt64(left.ToNumber()) ^ Convert.ToInt64(right.ToNumber()));
break;
case BinaryExpressionType.Same:
// 11.9.6 The Strict Equality Comparison Algorithm
if (left.Type != right.Type)
{
Result = Global.BooleanClass.False;
}
else if (left is JsUndefined) {
Result = Global.BooleanClass.True;
}
else if (left is JsNull) {
Result = Global.BooleanClass.True;
}
else if (left.Type == JsInstance.TYPE_NUMBER)
{
if (left == Global.NumberClass["NaN"] || right == Global.NumberClass["NaN"]) {
Result = Global.BooleanClass.False;
}
else if (left.ToNumber() == right.ToNumber()) {
Result = Global.BooleanClass.True;
}
else
Result = Global.BooleanClass.False;
}
else if (left.Type == JsInstance.TYPE_STRING)
{
Result = Global.BooleanClass.New(left.ToString() == right.ToString());
}
else if (left.Type == JsInstance.TYPE_BOOLEAN)
{
Result = Global.BooleanClass.New(left.ToBoolean() == right.ToBoolean());
}
else if (left == right) {
Result = Global.BooleanClass.True;
}
else {
Result = Global.BooleanClass.False;
}
break;
case BinaryExpressionType.NotSame:
new BinaryExpression(BinaryExpressionType.Same, expression.LeftExpression, expression.RightExpression).Accept(this);
Result = Global.BooleanClass.New(!Result.ToBoolean());
break;
case BinaryExpressionType.LeftShift:
if (left == JsUndefined.Instance)
Result = Global.NumberClass.New(0);
else if (right == JsUndefined.Instance)
Result = Global.NumberClass.New(Convert.ToInt64(left.ToNumber()));
else
Result = Global.NumberClass.New(Convert.ToInt64(left.ToNumber()) << Convert.ToUInt16(right.ToNumber()));
break;
case BinaryExpressionType.RightShift:
if (left == JsUndefined.Instance)
Result = Global.NumberClass.New(0);
else if (right == JsUndefined.Instance)
Result = Global.NumberClass.New(Convert.ToInt64(left.ToNumber()));
else
Result = Global.NumberClass.New(Convert.ToInt64(left.ToNumber()) >> Convert.ToUInt16(right.ToNumber()));
break;
case BinaryExpressionType.UnsignedRightShift:
if (left == JsUndefined.Instance)
Result = Global.NumberClass.New(0);
else if (right == JsUndefined.Instance)
Result = Global.NumberClass.New(Convert.ToInt64(left.ToNumber()));
else
Result = Global.NumberClass.New(Convert.ToInt64(left.ToNumber()) >> Convert.ToUInt16(right.ToNumber()));
break;
case BinaryExpressionType.InstanceOf: {
var func = right as JsFunction;
var obj = left as JsObject;
if (func == null)
throw new JsException(Global.TypeErrorClass.New("Right argument should be a function: " + expression.RightExpression.ToString()));
if (obj == null)
throw new JsException(Global.TypeErrorClass.New("Left argument should be an object: " + expression.LeftExpression.ToString()));
Result = Global.BooleanClass.New(func.HasInstance(obj));
}
break;
case BinaryExpressionType.In:
if (right is ILiteral) {
throw new JsException(Global.ErrorClass.New("Cannot apply 'in' operator to the specified member."));
}
else {
Result = Global.BooleanClass.New(((JsDictionaryObject)right).HasProperty(left));
}
break;
default:
throw new NotSupportedException("Unkown binary operator");
}
}
void Analyze(BinaryExpression Stmt)
{
SetCurrentLineAndCharNos(Stmt);
if (Stmt.LeftExpression != null) Analyze(Stmt.LeftExpression);
AddToJintStack(Stmt.Source, JintState.BinaryOperator, "");
if (Stmt.RightExpression != null) Analyze(Stmt.RightExpression);
}