private static void GetFieldScopeType(JSVariableField variableField, ActivationObject immediateScope, out string scope, out string type)
{
JSLocalField localField = variableField as JSLocalField;
JSPredefinedField predefinedField = variableField as JSPredefinedField;
JSNamedFunctionExpressionField namedFuncExpr = variableField as JSNamedFunctionExpressionField;
// default scope is blank
scope = string.Empty;
if (variableField is JSArgumentField)
{
type = StringMgr.GetString("MemberInfoTypeArgument");
}
else if (variableField is JSArgumentsField)
{
type = StringMgr.GetString("MemberInfoTypeArguments");
}
else if (predefinedField != null)
{
switch (predefinedField.GlobalObject)
{
case GlobalObjectInstance.GlobalObject:
scope = StringMgr.GetString("MemberInfoScopeGlobalObject");
break;
case GlobalObjectInstance.WindowObject:
scope = StringMgr.GetString("MemberInfoScopeWindowObject");
break;
case GlobalObjectInstance.Other:
scope = StringMgr.GetString("MemberInfoScopeOtherObject");
break;
}
switch (predefinedField.MemberType)
{
case MemberTypes.Method:
type = StringMgr.GetString("MemberInfoBuiltInMethod");
break;
case MemberTypes.Property:
type = StringMgr.GetString("MemberInfoBuiltInProperty");
break;
default:
type = StringMgr.GetString("MemberInfoBuiltInObject");
break;
}
}
else if (variableField is JSGlobalField)
{
if ((variableField.Attributes & FieldAttributes.RTSpecialName) == FieldAttributes.RTSpecialName)
{
// this is a special "global." It might not be a global, but something referenced
// in a with scope somewhere down the line.
type = StringMgr.GetString("MemberInfoPossiblyUndefined");
}
else if (variableField.FieldValue is FunctionObject)
{
if (variableField.NamedFunctionExpression == null)
{
type = StringMgr.GetString("MemberInfoGlobalFunction");
}
else
{
type = StringMgr.GetString("MemberInfoFunctionExpression");
}
}
else
{
type = StringMgr.GetString("MemberInfoGlobalVar");
}
}
else if (variableField is JSWithField)
{
type = StringMgr.GetString("MemberInfoWithField");
}
else if (namedFuncExpr != null)
{
type = StringMgr.GetString("MemberInfoSelfFuncExpr");
}
else if (localField != null)
{
// type string
if (localField.FieldValue is FunctionObject)
{
if (localField.NamedFunctionExpression == null)
{
type = StringMgr.GetString("MemberInfoLocalFunction");
}
else
{
type = StringMgr.GetString("MemberInfoFunctionExpression");
}
}
else if (localField.IsLiteral)
{
type = StringMgr.GetString("MemberInfoLocalLiteral");
}
else
{
type = StringMgr.GetString("MemberInfoLocalVar");
}
// scope string
// this is a local variable, so there MUST be a non-null function scope passed
// to us. That function scope will be the scope we are expecting local variables
// to be defined in. If the field is defined in that scope, it's local -- otherwise
// it must be an outer variable.
JSVariableField scopeField = immediateScope[variableField.Name];
if (scopeField == null || scopeField.OuterField != null)
{
scope = StringMgr.GetString("MemberInfoScopeOuter");
}
else
{
scope = StringMgr.GetString("MemberInfoScopeLocal");
}
}
else
{
type = StringMgr.GetString("MemberInfoBuiltInObject");
}
}
private string NumericToString()
{
// numerics are doubles in JavaScript, so force it now as a shortcut
double doubleValue = (double)Value;
if (double.IsNaN(doubleValue) || double.IsInfinity(doubleValue))
{
// weird number -- just return the uncrunched source code as-is.
// we've should have already thrown an error alerting the developer
// to the overflow mistake, and it might alter the code to change the value
if (this.Context != null && !string.IsNullOrEmpty(Context.Code) &&
string.CompareOrdinal(Context.Code, "[generated code]") != 0)
{
return(Context.Code);
}
// Hmmm... don't have a context source.
// Must be generated. Just generate the proper JS literal.
//
// DANGER! If we just output NaN and Infinity and -Infinity blindly, that assumes
// that there aren't any local variables in this scope chain with that
// name, and we're pulling the GLOBAL properties. Might want to use properties
// on the Number object -- which, of course, assumes that Number doesn't
// resolve to a local variable...
string objectName = double.IsNaN(doubleValue) ? "NaN" : "Infinity";
ActivationObject enclosingScope = EnclosingScope;
if (!(enclosingScope is GlobalScope))
{
JSPredefinedField globalReference = enclosingScope.FindReference(objectName) as JSPredefinedField;
if (globalReference == null)
{
// the name doesn't resolve to the global object properties! Must be a local field in the way!
// we can't assume the local field of this name contains the proper numeric value or we
// could get into big trouble.
// try the Number object
globalReference = enclosingScope.FindReference("Number") as JSPredefinedField;
if (globalReference != null)
{
// use the properties off this object. Not very compact, but accurate.
// I don't think there will be any precedence problems with these constructs --
// the member-dot operator is pretty high on the precedence scale.
if (double.IsPositiveInfinity(doubleValue))
{
return("Number.POSITIVE_INFINITY");
}
if (double.IsNegativeInfinity(doubleValue))
{
return("Number.NEGATIVE_INFINITY");
}
return("Number.NaN");
}
else
{
// that doesn't resolve to the global Number object, either!
// well, extreme circumstances. Let's use literals to generate those values.
if (double.IsPositiveInfinity(doubleValue))
{
// 1 divided by zero is +Infinity
return("(1/0)");
}
if (double.IsNegativeInfinity(doubleValue))
{
// 1 divided by negative zero is -Infinity
return("(1/-0)");
}
// the unary plus converts to a number, and "x" will generate NaN
return("(+'x')");
}
}
}
// we're good to go -- just return the name because it will resolve to the
// global properties (make a special case for negative infinity)
return(double.IsNegativeInfinity(doubleValue) ? "-Infinity" : objectName);
}
else if (doubleValue == 0)
{
// special case zero because we don't need to go through all those
// gyrations to get a "0" -- and because negative zero is different
// than a positive zero
return(IsNegativeZero ? "-0" : "0");
}
else
{
// normal string representations
string normal = GetSmallestRep(doubleValue.ToString("R", CultureInfo.InvariantCulture));
// if this is an integer (no decimal portion)....
if (Math.Floor(doubleValue) == doubleValue)
{
// then convert to hex and see if it's smaller.
// only really big numbers might be smaller in hex.
string hex = NormalOrHexIfSmaller(doubleValue, normal);
if (hex.Length < normal.Length)
{
normal = hex;
}
}
return(normal);
}
}
