private bool WriteSingleEnumItem(
JavascriptConversionContext context,
JavascriptWriter writer,
long numValue,
object enumValue,
bool inStringAlready)
{
if ((this.opts & EnumOptions.UseStrings) != 0)
{
if (inStringAlready)
{
if ((this.opts & EnumOptions.UseNumbers) != 0)
{
writer.WriteLiteralStringContent(numValue.ToString());
}
else
{
var str = enumValue.ToString();
if (numValue == 0 && str == "0")
{
writer.WriteLiteralStringContent("");
}
else
{
writer.WriteLiteralStringContent(str);
}
}
return(true);
}
using (writer.Operation(JavascriptOperationTypes.Literal))
{
if ((this.opts & EnumOptions.UseNumbers) != 0)
{
writer.WriteLiteral(numValue.ToString());
}
else
{
var str = enumValue.ToString();
if (numValue == 0 && str == "0")
{
writer.WriteLiteral("");
}
else
{
writer.WriteLiteral(str);
}
}
return(true);
}
}
if ((this.opts & EnumOptions.UseNumbers) != 0)
{
using (writer.Operation(JavascriptOperationTypes.Literal))
writer.WriteLiteral(numValue);
return(true);
}
if ((this.opts & EnumOptions.UseStaticFields) != 0)
{
using (writer.Operation(JavascriptOperationTypes.IndexerProperty))
context.Write(enumValue.GetType().Name).WriteAccessor(enumValue.ToString());
return(true);
}
return(false);
}
public override void ConvertToJavascript(JavascriptConversionContext context)
{
var methodCall = context.Node as MethodCallExpression;
if (methodCall != null)
{
if (methodCall.Method.DeclaringType == typeof(Math))
{
NameLength jsInfo;
if (membersMap.TryGetValue(methodCall.Method.Name, out jsInfo))
{
if (methodCall.Arguments.Count == jsInfo.length)
{
using (context.Operation(JavascriptOperationTypes.Call))
{
using (context.Operation(JavascriptOperationTypes.IndexerProperty))
context.Write("Math." + jsInfo.name);
context.WriteManyIsolated('(', ')', ',', methodCall.Arguments);
}
return;
}
else if (methodCall.Method.Name == "Log" &&
methodCall.Arguments.Count == 2)
{
// JavaScript does not support `Math.log` with 2 parameters,
// But it is easy enough for us to give a little help!
using (context.Operation(JavascriptOperationTypes.MulDivMod))
{
using (context.Operation(JavascriptOperationTypes.Call))
{
using (context.Operation(JavascriptOperationTypes.IndexerProperty))
context.Write("Math.log");
context.Write('(');
using (context.Operation(0))
context.Write(methodCall.Arguments[0]);
context.Write(')');
}
context.Write('/');
using (context.Operation(JavascriptOperationTypes.Call))
{
using (context.Operation(JavascriptOperationTypes.IndexerProperty))
context.Write("Math.log");
context.Write('(');
using (context.Operation(0))
context.Write(methodCall.Arguments[1]);
context.Write(')');
}
}
return;
}
else if (methodCall.Method.Name == "Round" &&
methodCall.Arguments.Count == 2 &&
TypeHelpers.IsNumericType(methodCall.Arguments[1].Type))
{
// We won't support `Math.Round` with two parameters by default.
// To do it, we'd have to repeat an input value in the expression (unacceptable):
// Math.Round(A, B) => Math.round(A * Math.pow(10, B)) / Math.pow(10, B)
// Or start helping with hacky things (acceptable, but not by default):
// Math.Round(A, B) => (function(a, b) { return Math.round(a * b) / b; })(A, Math.pow(10, B));
if (this.round2)
{
using (context.Operation(JavascriptOperationTypes.Call))
{
context.WriteLambda <Func <double, double, double> >((a, b) => Math.Round(a * b) / b);
context.Write('(');
using (context.Operation(0))
context.Write(methodCall.Arguments[0]);
context.Write(',');
using (context.Operation(0))
using (context.Operation(JavascriptOperationTypes.Call))
{
using (context.Operation(JavascriptOperationTypes.IndexerProperty))
context.Write("Math.pow");
context.Write('(');
context.Write("10");
context.Write(',');
using (context.Operation(0))
context.Write(methodCall.Arguments[1]);
context.Write(')');
}
context.Write(')');
return;
}
}
}
}
}
}
// E and PI are constant values, they will never result in
// a member access expression. We will have to catch the
// exact numbers, and convert them instead.
var constVal = context.Node as ConstantExpression;
if (constVal != null)
{
if (constVal.Value.Equals(Math.E))
{
using (context.Operation(JavascriptOperationTypes.IndexerProperty))
context.Write("Math.E");
}
else if (constVal.Value.Equals(Math.PI))
{
using (context.Operation(JavascriptOperationTypes.IndexerProperty))
context.Write("Math.PI");
}
}
}
