/// <summary>
/// Evaluate this line and return the value that would be stored
/// into the lhs.
/// </summary>
public Value Evaluate(Context context)
{
int rhsATypeInt = rhsA == null ? -1 : rhsA.GetBaseMiniscriptType();
if (op == Op.AssignA || op == Op.ReturnA || op == Op.AssignImplicit)
{
// Assignment is a bit of a special case. It's EXTREMELY common
// in TAC, so needs to be efficient, but we have to watch out for
// the case of a RHS that is a list or map. This means it was a
// literal in the source, and may contain references that need to
// be evaluated now.
//if (rhsA is ValList || rhsA is ValMap) {
if (rhsATypeInt == MiniscriptTypeInts.ValListTypeInt || rhsATypeInt == MiniscriptTypeInts.ValMapTypeInt)
{
return(rhsA.FullEval(context));
}
else if (rhsA == null)
{
return(null);
}
else
{
return(rhsA.Val(context, true));
}
}
if (op == Op.CopyA)
{
// This opcode is used for assigning a literal. We actually have
// to copy the literal, in the case of a mutable object like a
// list or map, to ensure that if the same code executes again,
// we get a new, unique object.
//if (rhsA is ValList) {
if (rhsATypeInt == MiniscriptTypeInts.ValListTypeInt)
{
return(((ValList)rhsA).EvalCopy(context));
//} else if (rhsA is ValMap) {
}
else if (rhsATypeInt == MiniscriptTypeInts.ValMapTypeInt)
{
return(((ValMap)rhsA).EvalCopy(context));
}
else if (rhsA == null)
{
return(null);
}
else
{
return(rhsA.Val(context, true));
}
}
Value opA = rhsA != null?rhsA.Val(context, false) : null;
Value opB = rhsB != null?rhsB.Val(context, false) : null;
int opATypeInt = opA == null ? -1 : opA.GetBaseMiniscriptType();
int opBTypeInt = opB == null ? -1 : opB.GetBaseMiniscriptType();
if (op == Op.AisaB)
{
if (opA == null)
{
return(ValNumber.Truth(opB == null));
}
return(ValNumber.Truth(opA.IsA(opB, context.vm)));
}
//if (op == Op.ElemBofA && opB is ValString) {
if (op == Op.ElemBofA && opBTypeInt == MiniscriptTypeInts.ValStringTypeInt)
{
// You can now look for a string in almost anything...
// and we have a convenient (and relatively fast) method for it:
ValMap ignored;
return(ValSeqElem.Resolve(opA, ((ValString)opB).value, context, out ignored));
}
// check for special cases of comparison to null (works with any type)
if (op == Op.AEqualB && (opA == null || opB == null))
{
return(ValNumber.Truth(opA == opB));
}
if (op == Op.ANotEqualB && (opA == null || opB == null))
{
return(ValNumber.Truth(opA != opB));
}
// check for implicit coersion of other types to string; this happens
// when either side is a string and the operator is addition.
//if ((opA is ValString || opB is ValString) && op == Op.APlusB) {
if ((opATypeInt == MiniscriptTypeInts.ValStringTypeInt || opBTypeInt == MiniscriptTypeInts.ValStringTypeInt) && op == Op.APlusB)
{
string sA = opA != null?opA.ToString(context.vm) : string.Empty;
string sB = opB != null?opB.ToString(context.vm) : string.Empty;
if (sA.Length + sB.Length > ValString.maxSize)
{
throw new LimitExceededException("string too large");
}
return(ValString.Create(sA + sB));
}
//if (opA is ValNumber) {
if (opATypeInt == MiniscriptTypeInts.ValNumberTypeInt)
{
double numA = ((ValNumber)opA).value;
switch (op)
{
case Op.GotoA:
context.lineNum = (int)numA;
return(null);
case Op.GotoAifB:
if (opB != null && opB.BoolValue())
{
context.lineNum = (int)numA;
}
return(null);
case Op.GotoAifTrulyB:
{
// Unlike GotoAifB, which branches if B has any nonzero
// value (including 0.5 or 0.001), this branches only if
// B is TRULY true, i.e., its integer value is nonzero.
// (Used for short-circuit evaluation of "or".)
int i = 0;
if (opB != null)
{
i = opB.IntValue();
}
if (i != 0)
{
context.lineNum = (int)numA;
}
return(null);
}
case Op.GotoAifNotB:
if (opB == null || !opB.BoolValue())
{
context.lineNum = (int)numA;
}
return(null);
case Op.CallIntrinsicA:
// NOTE: intrinsics do not go through NextFunctionContext. Instead
// they execute directly in the current context. (But usually, the
// current context is a wrapper function that was invoked via
// Op.CallFunction, so it got a parameter context at that time.)
Intrinsic.Result result = Intrinsic.Execute((int)numA, context, context.partialResult);
if (result.done)
{
context.partialResult = default(Intrinsic.Result);
return(result.result);
}
// OK, this intrinsic function is not yet done with its work.
// We need to stay on this same line and call it again with
// the partial result, until it reports that its job is complete.
context.partialResult = result;
context.lineNum--;
return(null);
case Op.NotA:
return(ValNumber.Create(1.0 - AbsClamp01(numA)));
}
//if (opB is ValNumber || opB == null) {
if (opBTypeInt == MiniscriptTypeInts.ValNumberTypeInt || opB == null)
{
double numB = opB != null ? ((ValNumber)opB).value : 0;
switch (op)
{
case Op.APlusB:
return(ValNumber.Create(numA + numB));
case Op.AMinusB:
return(ValNumber.Create(numA - numB));
case Op.ATimesB:
return(ValNumber.Create(numA * numB));
case Op.ADividedByB:
return(ValNumber.Create(numA / numB));
case Op.AModB:
return(ValNumber.Create(numA % numB));
case Op.APowB:
return(ValNumber.Create(Math.Pow(numA, numB)));
case Op.AEqualB:
return(ValNumber.Truth(numA == numB));
case Op.ANotEqualB:
return(ValNumber.Truth(numA != numB));
case Op.AGreaterThanB:
return(ValNumber.Truth(numA > numB));
case Op.AGreatOrEqualB:
return(ValNumber.Truth(numA >= numB));
case Op.ALessThanB:
return(ValNumber.Truth(numA < numB));
case Op.ALessOrEqualB:
return(ValNumber.Truth(numA <= numB));
case Op.AAndB:
//if (!(opB is ValNumber))
//numB = opB != null && opB.BoolValue() ? 1 : 0;
return(ValNumber.Create(Clamp01(numA * numB)));
case Op.AOrB:
//if (!(opB is ValNumber))
//numB = opB != null && opB.BoolValue() ? 1 : 0;
return(ValNumber.Create(Clamp01(numA + numB - numA * numB)));
default:
break;
}
}
else if (opBTypeInt == MiniscriptTypeInts.ValCustomTypeInt)
{
// Most types should commute with number
// But in case not we have a flag to say if the other is on
// the lhs or rhs
ValCustom customB = opB as ValCustom;
switch (op)
{
case Op.APlusB:
return(customB.APlusB(opA, opATypeInt, context, false));
case Op.AMinusB:
return(customB.AMinusB(opA, opATypeInt, context, false));
case Op.ATimesB:
return(customB.ATimesB(opA, opATypeInt, context, false));
case Op.ADividedByB:
return(customB.ADividedByB(opA, opATypeInt, context, false));
}
}
// Handle equality testing between a number (opA) and a non-number (opB).
// These are always considered unequal.
if (op == Op.AEqualB)
{
return(ValNumber.zero);
}
if (op == Op.ANotEqualB)
{
return(ValNumber.one);
}
//} else if (opA is ValString) {
}
else if (opATypeInt == MiniscriptTypeInts.ValStringTypeInt)
{
string strA = ((ValString)opA).value;
if (op == Op.ATimesB || op == Op.ADividedByB)
{
double factor = 0;
if (op == Op.ATimesB)
{
Check.Type(opB, typeof(ValNumber), "string replication");
factor = ((ValNumber)opB).value;
}
else
{
Check.Type(opB, typeof(ValNumber), "string division");
factor = 1.0 / ((ValNumber)opB).value;
}
int repeats = (int)factor;
if (repeats < 0)
{
return(ValString.empty);
}
if (repeats * strA.Length > ValString.maxSize)
{
throw new LimitExceededException("string too large");
}
if (_workingStringBuilder == null)
{
_workingStringBuilder = new StringBuilder();
}
else
{
_workingStringBuilder.Clear();
}
for (int i = 0; i < repeats; i++)
{
_workingStringBuilder.Append(strA);
}
int extraChars = (int)(strA.Length * (factor - repeats));
if (extraChars > 0)
{
_workingStringBuilder.Append(strA.Substring(0, extraChars));
}
return(ValString.Create(_workingStringBuilder.ToString()));
}
if (op == Op.ElemBofA || op == Op.ElemBofIterA)
{
int idx = opB.IntValue();
Check.Range(idx, -strA.Length, strA.Length - 1, "string index");
if (idx < 0)
{
idx += strA.Length;
}
return(ValString.Create(strA.Substring(idx, 1)));
}
//if (opB == null || opB is ValString) {
if (opB == null || opBTypeInt == MiniscriptTypeInts.ValStringTypeInt)
{
string sB = (opB == null ? null : opB.ToString(context.vm));
switch (op)
{
case Op.AMinusB: {
if (opB == null)
{
opA.Ref();
return(opA);
}
if (strA.EndsWith(sB))
{
strA = strA.Substring(0, strA.Length - sB.Length);
}
return(ValString.Create(strA));
}
case Op.NotA:
return(ValNumber.Truth(string.IsNullOrEmpty(strA)));
case Op.AEqualB:
return(ValNumber.Truth(string.Equals(strA, sB)));
case Op.ANotEqualB:
return(ValNumber.Truth(!string.Equals(strA, sB)));
case Op.AGreaterThanB:
return(ValNumber.Truth(string.Compare(strA, sB, StringComparison.Ordinal) > 0));
case Op.AGreatOrEqualB:
return(ValNumber.Truth(string.Compare(strA, sB, StringComparison.Ordinal) >= 0));
case Op.ALessThanB:
int foo = string.Compare(strA, sB, StringComparison.Ordinal);
return(ValNumber.Truth(foo < 0));
case Op.ALessOrEqualB:
return(ValNumber.Truth(string.Compare(strA, sB, StringComparison.Ordinal) <= 0));
case Op.LengthOfA:
return(ValNumber.Create(strA.Length));
default:
break;
}
}
else
{
// RHS is neither null nor a string.
// We no longer automatically coerce in all these cases; about
// all we can do is equal or unequal testing.
// (Note that addition was handled way above here.)
if (op == Op.AEqualB)
{
return(ValNumber.zero);
}
if (op == Op.ANotEqualB)
{
return(ValNumber.one);
}
}
//} else if (opA is ValList) {
}
else if (opATypeInt == MiniscriptTypeInts.ValListTypeInt)
{
ValList listA = ((ValList)opA);
if (op == Op.ElemBofA || op == Op.ElemBofIterA)
{
// list indexing
int idx = opB.IntValue();
Check.Range(idx, -listA.Count, listA.Count - 1, "list index");
if (idx < 0)
{
idx += listA.Count;
}
Value val = listA[idx];
if (val != null)
{
val.Ref();
}
return(val);
}
else if (op == Op.LengthOfA)
{
return(ValNumber.Create(listA.Count));
}
else if (op == Op.AEqualB)
{
return(ValNumber.Truth(((ValList)opA).Equality(opB)));
}
else if (op == Op.ANotEqualB)
{
return(ValNumber.Truth(1.0 - ((ValList)opA).Equality(opB)));
}
else if (op == Op.APlusB)
{
// list concatenation
Check.Type(opB, typeof(ValList), "list concatenation");
ValList listB = ((ValList)opB);
if (listA.Count + listB.Count > ValList.maxSize)
{
throw new LimitExceededException("list too large");
}
ValList result = ValList.Create(listA.Count + listB.Count);
for (int i = 0; i < listA.Count; i++)
{
result.Add(context.ValueInContext(listA[i]));
}
for (int i = 0; i < listB.Count; i++)
{
result.Add(context.ValueInContext(listB[i]));
}
return(result);
}
else if (op == Op.ATimesB || op == Op.ADividedByB)
{
// list replication (or division)
double factor = 0;
if (op == Op.ATimesB)
{
Check.Type(opB, typeof(ValNumber), "list replication");
factor = ((ValNumber)opB).value;
}
else
{
Check.Type(opB, typeof(ValNumber), "list division");
factor = 1.0 / ((ValNumber)opB).value;
}
if (factor <= 0)
{
return(ValList.Create());
}
int finalCount = (int)(listA.Count * factor);
if (finalCount > ValList.maxSize)
{
throw new LimitExceededException("list too large");
}
ValList result = ValList.Create(finalCount);
for (int i = 0; i < finalCount; i++)
{
result.Add(listA[i % listA.Count]);
}
return(result);
}
else if (op == Op.NotA)
{
return(ValNumber.Truth(!opA.BoolValue()));
}
//} else if (opA is ValMap) {
}
else if (opATypeInt == MiniscriptTypeInts.ValMapTypeInt)
{
if (op == Op.ElemBofA)
{
// map lookup
// (note, cases where opB is a string are handled above, along with
// all the other types; so we'll only get here for non-string cases)
ValSeqElem se = ValSeqElem.Create(opA, opB);
Value ret = se.Val(context, true);
//if (se != null)
//se.Unref();
return(ret);
// (This ensures we walk the "__isa" chain in the standard way.)
}
else if (op == Op.ElemBofIterA)
{
// With a map, ElemBofIterA is different from ElemBofA. This one
// returns a mini-map containing a key/value pair.
return(((ValMap)opA).GetKeyValuePair(opB.IntValue()));
}
else if (op == Op.LengthOfA)
{
return(ValNumber.Create(((ValMap)opA).Count));
}
else if (op == Op.AEqualB)
{
return(ValNumber.Truth(((ValMap)opA).Equality(opB)));
}
else if (op == Op.ANotEqualB)
{
return(ValNumber.Truth(1.0 - ((ValMap)opA).Equality(opB)));
}
else if (op == Op.APlusB)
{
// map combination
Check.Type(opB, typeof(ValMap), "map combination");
ValMap result = ValMap.Create();
ValMap mapA = opA as ValMap;
var aKeys = mapA.Keys;
var aVals = mapA.Values;
for (int i = 0; i < aKeys.Count; i++)
{
result[aKeys[i]] = context.ValueInContext(aVals[i]);
}
ValMap mapB = opB as ValMap;
var bKeys = mapB.Keys;
var bVals = mapB.Values;
for (int i = 0; i < bKeys.Count; i++)
{
result[bKeys[i]] = context.ValueInContext(bVals[i]);
}
return(result);
}
else if (op == Op.NotA)
{
return(ValNumber.Truth(!opA.BoolValue()));
}
//} else if (opA is ValFunction && opB is ValFunction) {
}
else if (opATypeInt == MiniscriptTypeInts.ValFunctionTypeInt && opBTypeInt == MiniscriptTypeInts.ValFunctionTypeInt)
{
Function fA = ((ValFunction)opA).function;
Function fB = ((ValFunction)opB).function;
switch (op)
{
case Op.AEqualB:
return(ValNumber.Truth(fA == fB));
case Op.ANotEqualB:
return(ValNumber.Truth(fA != fB));
}
}
else if (opATypeInt == MiniscriptTypeInts.ValCustomTypeInt)
{
ValCustom customA = opA as ValCustom;
switch (op)
{
case Op.APlusB:
return(customA.APlusB(opB, opBTypeInt, context, true));
case Op.AMinusB:
return(customA.AMinusB(opB, opBTypeInt, context, true));
case Op.ATimesB:
return(customA.ATimesB(opB, opBTypeInt, context, true));
case Op.ADividedByB:
return(customA.ADividedByB(opB, opBTypeInt, context, true));
}
}
else
{
// opA is something else... perhaps null
switch (op)
{
case Op.BindAssignA:
{
if (context.variables == null)
{
context.variables = ValMap.Create();
}
ValFunction valFunc = (ValFunction)opA;
return(valFunc.BindAndCopy(context.variables));
//valFunc.outerVars = context.variables;
//return null;
}
case Op.NotA:
return(opA != null && opA.BoolValue() ? ValNumber.zero : ValNumber.one);
}
}
if (op == Op.AAndB || op == Op.AOrB)
{
// We already handled the case where opA was a number above;
// this code handles the case where opA is something else.
double numA = opA != null && opA.BoolValue() ? 1 : 0;
double numB;
//if (opB is ValNumber) fB = ((ValNumber)opB).value;
if (opBTypeInt == MiniscriptTypeInts.ValNumberTypeInt)
{
numB = ((ValNumber)opB).value;
}
else
{
numB = opB != null && opB.BoolValue() ? 1 : 0;
}
double result;
if (op == Op.AAndB)
{
result = numA * numB;
}
else
{
result = 1.0 - (1.0 - AbsClamp01(numA)) * (1.0 - AbsClamp01(numB));
}
return(ValNumber.Create(result));
}
return(null);
}
/// <summary>
/// Evaluate this line and return the value that would be stored
/// into the lhs.
/// </summary>
public Value Evaluate(Context context)
{
if (op == Op.AssignA || op == Op.ReturnA || op == Op.AssignImplicit)
{
// Assignment is a bit of a special case. It's EXTREMELY common
// in TAC, so needs to be efficient, but we have to watch out for
// the case of a RHS that is a list or map. This means it was a
// literal in the source, and may contain references that need to
// be evaluated now.
if (rhsA is ValList || rhsA is ValMap)
{
return(rhsA.FullEval(context));
}
else if (rhsA == null)
{
return(null);
}
else
{
return(rhsA.Val(context));
}
}
if (op == Op.CopyA)
{
// This opcode is used for assigning a literal. We actually have
// to copy the literal, in the case of a mutable object like a
// list or map, to ensure that if the same code executes again,
// we get a new, unique object.
if (rhsA is ValList)
{
return(((ValList)rhsA).EvalCopy(context));
}
else if (rhsA is ValMap)
{
return(((ValMap)rhsA).EvalCopy(context));
}
else if (rhsA == null)
{
return(null);
}
else
{
return(rhsA.Val(context));
}
}
Value opA = rhsA != null?rhsA.Val(context) : null;
Value opB = rhsB != null?rhsB.Val(context) : null;
if (op == Op.AisaB)
{
return(ValNumber.Truth(opA.IsA(opB, context.vm)));
}
if (op == Op.ElemBofA && opB is ValString)
{
// You can now look for a string in almost anything...
// and we have a convenient (and relatively fast) method for it:
ValMap ignored;
return(ValSeqElem.Resolve(opA, ((ValString)opB).value, context, out ignored));
}
if (op == Op.AEqualB && (opA == null || opB == null))
{
return(ValNumber.Truth(opA == opB));
}
if (op == Op.ANotEqualB && (opA == null || opB == null))
{
return(ValNumber.Truth(opA != opB));
}
if (opA is ValNumber)
{
double fA = ((ValNumber)opA).value;
switch (op)
{
case Op.GotoA:
context.lineNum = (int)fA;
return(null);
case Op.GotoAifB:
if (opB != null && opB.BoolValue())
{
context.lineNum = (int)fA;
}
return(null);
case Op.GotoAifTrulyB:
{
// Unlike GotoAifB, which branches if B has any nonzero
// value (including 0.5 or 0.001), this branches only if
// B is TRULY true, i.e., its integer value is nonzero.
// (Used for short-circuit evaluation of "or".)
int i = 0;
if (opB != null)
{
i = opB.IntValue();
}
if (i != 0)
{
context.lineNum = (int)fA;
}
return(null);
}
case Op.GotoAifNotB:
if (opB == null || !opB.BoolValue())
{
context.lineNum = (int)fA;
}
return(null);
case Op.CallIntrinsicA:
// NOTE: intrinsics do not go through NextFunctionContext. Instead
// they execute directly in the current context. (But usually, the
// current context is a wrapper function that was invoked via
// Op.CallFunction, so it got a parameter context at that time.)
Intrinsic.Result result = Intrinsic.Execute((int)fA, context, context.partialResult);
if (result.done)
{
context.partialResult = null;
return(result.result);
}
// OK, this intrinsic function is not yet done with its work.
// We need to stay on this same line and call it again with
// the partial result, until it reports that its job is complete.
context.partialResult = result;
context.lineNum--;
return(null);
case Op.NotA:
return(new ValNumber(1.0 - AbsClamp01(fA)));
}
if (opB is ValNumber || opB == null)
{
double fB = opB != null ? ((ValNumber)opB).value : 0;
switch (op)
{
case Op.APlusB:
return(new ValNumber(fA + fB));
case Op.AMinusB:
return(new ValNumber(fA - fB));
case Op.ATimesB:
return(new ValNumber(fA * fB));
case Op.ADividedByB:
return(new ValNumber(fA / fB));
case Op.AModB:
return(new ValNumber(fA % fB));
case Op.APowB:
return(new ValNumber(Math.Pow(fA, fB)));
case Op.AEqualB:
return(ValNumber.Truth(fA == fB));
case Op.ANotEqualB:
return(ValNumber.Truth(fA != fB));
case Op.AGreaterThanB:
return(ValNumber.Truth(fA > fB));
case Op.AGreatOrEqualB:
return(ValNumber.Truth(fA >= fB));
case Op.ALessThanB:
return(ValNumber.Truth(fA < fB));
case Op.ALessOrEqualB:
return(ValNumber.Truth(fA <= fB));
case Op.AAndB:
if (!(opB is ValNumber))
{
fB = opB != null && opB.BoolValue() ? 1 : 0;
}
return(new ValNumber(Clamp01(fA * fB)));
case Op.AOrB:
if (!(opB is ValNumber))
{
fB = opB != null && opB.BoolValue() ? 1 : 0;
}
return(new ValNumber(Clamp01(fA + fB - fA * fB)));
default:
break;
}
}
else if (opB is ValString)
{
// number (op) string
string sA = opA.ToString();
string sB = opB.ToString();
switch (op)
{
case Op.APlusB:
return(new ValString(sA + sB));
default:
break;
}
}
}
else if (opA is ValString)
{
string sA = ((ValString)opA).value;
switch (op)
{
case Op.APlusB:
{
if (opB == null)
{
return(opA);
}
String sB = opB.ToString(context.vm);
if (sA.Length + sB.Length > ValString.maxSize)
{
throw new LimitExceededException("string too large");
}
return(new ValString(sA + sB));
}
case Op.AMinusB:
{
if (opB == null)
{
return(opA);
}
string sB = opB.ToString(context.vm);
if (sA.EndsWith(sB))
{
sA = sA.Substring(0, sA.Length - sB.Length);
}
return(new ValString(sA));
}
case Op.ATimesB:
case Op.ADividedByB:
{
double factor = 0;
if (op == Op.ATimesB)
{
Check.Type(opB, typeof(ValNumber), "string replication");
factor = ((ValNumber)opB).value;
}
else
{
Check.Type(opB, typeof(ValNumber), "string division");
factor = 1.0 / ((ValNumber)opB).value;
}
int repeats = (int)factor;
if (repeats < 0)
{
return(ValString.empty);
}
if (repeats * sA.Length > ValString.maxSize)
{
throw new LimitExceededException("string too large");
}
var result = new System.Text.StringBuilder();
for (int i = 0; i < repeats; i++)
{
result.Append(sA);
}
int extraChars = (int)(sA.Length * (factor - repeats));
if (extraChars > 0)
{
result.Append(sA.Substring(0, extraChars));
}
return(new ValString(result.ToString()));
}
case Op.AEqualB:
return(ValNumber.Truth(string.Compare(sA, opB.ToString(context.vm)) == 0));
case Op.ANotEqualB:
return(ValNumber.Truth(string.Compare(sA, opB.ToString(context.vm)) != 0));
case Op.AGreaterThanB:
return(ValNumber.Truth(string.Compare(sA, opB.ToString(context.vm)) > 0));
case Op.AGreatOrEqualB:
return(ValNumber.Truth(string.Compare(sA, opB.ToString(context.vm)) >= 0));
case Op.ALessThanB:
return(ValNumber.Truth(string.Compare(sA, opB.ToString(context.vm)) < 0));
case Op.ALessOrEqualB:
return(ValNumber.Truth(string.Compare(sA, opB.ToString(context.vm)) <= 0));
case Op.ElemBofA:
case Op.ElemBofIterA:
{
int idx = opB.IntValue();
Check.Range(idx, -sA.Length, sA.Length - 1, "string index");
if (idx < 0)
{
idx += sA.Length;
}
return(new ValString(sA.Substring(idx, 1)));
}
case Op.LengthOfA:
return(new ValNumber(sA.Length));
default:
break;
}
}
else if (opA is ValList)
{
List <Value> list = ((ValList)opA).values;
if (op == Op.ElemBofA || op == Op.ElemBofIterA)
{
// list indexing
int idx = opB.IntValue();
Check.Range(idx, -list.Count, list.Count - 1, "list index");
if (idx < 0)
{
idx += list.Count;
}
return(list[idx]);
}
else if (op == Op.LengthOfA)
{
return(new ValNumber(list.Count));
}
else if (op == Op.AEqualB)
{
return(ValNumber.Truth(((ValList)opA).Equality(opB)));
}
else if (op == Op.ANotEqualB)
{
return(ValNumber.Truth(1.0 - ((ValList)opA).Equality(opB)));
}
else if (op == Op.APlusB)
{
// list concatenation
Check.Type(opB, typeof(ValList), "list concatenation");
List <Value> list2 = ((ValList)opB).values;
if (list.Count + list2.Count > ValList.maxSize)
{
throw new LimitExceededException("list too large");
}
List <Value> result = new List <Value>(list.Count + list2.Count);
foreach (Value v in list)
{
result.Add(v == null ? null : v.Val(context));
}
foreach (Value v in list2)
{
result.Add(v == null ? null : v.Val(context));
}
return(new ValList(result));
}
else if (op == Op.ATimesB || op == Op.ADividedByB)
{
// list replication (or division)
double factor = 0;
if (op == Op.ATimesB)
{
Check.Type(opB, typeof(ValNumber), "list replication");
factor = ((ValNumber)opB).value;
}
else
{
Check.Type(opB, typeof(ValNumber), "list division");
factor = 1.0 / ((ValNumber)opB).value;
}
if (factor <= 0)
{
return(new ValList());
}
int finalCount = (int)(list.Count * factor);
if (finalCount > ValList.maxSize)
{
throw new LimitExceededException("list too large");
}
List <Value> result = new List <Value>(finalCount);
for (int i = 0; i < finalCount; i++)
{
result.Add(list[i % list.Count]);
}
return(new ValList(result));
}
else if (op == Op.NotA)
{
return(ValNumber.Truth(!opA.BoolValue()));
}
}
else if (opA is ValMap)
{
if (op == Op.ElemBofA)
{
// map lookup
// (note, cases where opB is a string are handled above, along with
// all the other types; so we'll only get here for non-string cases)
ValSeqElem se = new ValSeqElem(opA, opB);
return(se.Val(context));
// (This ensures we walk the "__isa" chain in the standard way.)
}
else if (op == Op.ElemBofIterA)
{
// With a map, ElemBofIterA is different from ElemBofA. This one
// returns a mini-map containing a key/value pair.
return(((ValMap)opA).GetKeyValuePair(opB.IntValue()));
}
else if (op == Op.LengthOfA)
{
return(new ValNumber(((ValMap)opA).Count));
}
else if (op == Op.AEqualB)
{
return(ValNumber.Truth(((ValMap)opA).Equality(opB)));
}
else if (op == Op.ANotEqualB)
{
return(ValNumber.Truth(1.0 - ((ValMap)opA).Equality(opB)));
}
else if (op == Op.APlusB)
{
// map combination
Dictionary <Value, Value> map = ((ValMap)opA).map;
Check.Type(opB, typeof(ValMap), "map combination");
Dictionary <Value, Value> map2 = ((ValMap)opB).map;
ValMap result = new ValMap();
foreach (KeyValuePair <Value, Value> kv in map)
{
result.map[kv.Key] = kv.Value.Val(context);
}
foreach (KeyValuePair <Value, Value> kv in map2)
{
result.map[kv.Key] = kv.Value.Val(context);
}
return(result);
}
else if (op == Op.NotA)
{
return(ValNumber.Truth(!opA.BoolValue()));
}
}
else if (opA is ValFunction && opB is ValFunction)
{
Function fA = ((ValFunction)opA).function;
Function fB = ((ValFunction)opB).function;
switch (op)
{
case Op.AEqualB:
return(ValNumber.Truth(fA == fB));
case Op.ANotEqualB:
return(ValNumber.Truth(fA != fB));
}
}
else
{
// opA is something else... perhaps null
switch (op)
{
case Op.NotA:
return(opA != null && opA.BoolValue() ? ValNumber.zero : ValNumber.one);
}
}
if (op == Op.AAndB || op == Op.AOrB)
{
// We already handled the case where opA was a number above;
// this code handles the case where opA is something else.
double fA = opA != null && opA.BoolValue() ? 1 : 0;
double fB;
if (opB is ValNumber)
{
fB = ((ValNumber)opB).value;
}
else
{
fB = opB != null && opB.BoolValue() ? 1 : 0;
}
double result;
if (op == Op.AAndB)
{
result = fA * fB;
}
else
{
result = 1.0 - (1.0 - AbsClamp01(fA)) * (1.0 - AbsClamp01(fB));
}
return(new ValNumber(result));
}
return(null);
}