private static bool ProcessValueExpression(ExpressionBase expression, InterpreterScope scope, List <Term> terms, out ExpressionBase result)
{
var functionCall = expression as FunctionCallExpression;
if (functionCall != null)
{
var requirements = new List <Requirement>();
var context = new ValueBuilderContext()
{
Trigger = requirements
};
var valueScope = new InterpreterScope(scope)
{
Context = context
};
var error = context.CallFunction(functionCall, valueScope);
if (error != null)
{
result = error;
return(false);
}
SetImpliedMeasuredTarget(requirements);
return(ProcessMeasuredValue(requirements, expression, terms, out result));
}
var field = AchievementBuilder.CreateFieldFromExpression(expression);
if (field.Type != FieldType.None)
{
terms.Last().field = field;
result = null;
return(true);
}
var mathematic = expression as MathematicExpression;
if (mathematic != null)
{
if (mathematic.Operation == MathematicOperation.Multiply || mathematic.Operation == MathematicOperation.Divide)
{
var mathematicLeft = mathematic.Left as MathematicExpression;
if (mathematicLeft != null && MathematicExpression.GetPriority(mathematicLeft.Operation) == MathematicPriority.Add)
{
var newLeft = new MathematicExpression(mathematicLeft.Left, mathematic.Operation, mathematic.Right);
var newRight = new MathematicExpression(mathematicLeft.Right, mathematic.Operation, mathematic.Right);
mathematic = new MathematicExpression(newLeft, mathematicLeft.Operation, newRight);
}
}
if (!ProcessValueExpression(mathematic.Left, scope, terms, out result))
{
return(false);
}
field = AchievementBuilder.CreateFieldFromExpression(mathematic.Right);
if (MergeFields(field, terms.Last(), mathematic.Operation))
{
return(true);
}
switch (mathematic.Operation)
{
case MathematicOperation.Add:
terms.Add(new Term {
multiplier = 1.0
});
return(ProcessValueExpression(mathematic.Right, scope, terms, out result));
case MathematicOperation.Subtract:
terms.Add(new Term {
multiplier = -1.0
});
return(ProcessValueExpression(mathematic.Right, scope, terms, out result));
case MathematicOperation.Multiply:
case MathematicOperation.Divide:
return(ProcessValueExpression(WrapInMeasured(expression), scope, terms, out result));
}
}
var conditionalExpression = expression as ConditionalExpression;
if (conditionalExpression != null)
{
ParseErrorExpression parseError;
var achievement = new ScriptInterpreterAchievementBuilder();
if (!achievement.PopulateFromExpression(expression, scope, out parseError))
{
result = parseError;
return(false);
}
SetImpliedMeasuredTarget(achievement.CoreRequirements);
foreach (var alt in achievement.AlternateRequirements)
{
SetImpliedMeasuredTarget(alt);
}
var message = achievement.Optimize();
if (message != null)
{
result = new ParseErrorExpression(message, expression);
return(false);
}
if (achievement.AlternateRequirements.Any())
{
result = new ParseErrorExpression("Alt groups not supported in value expression", expression);
return(false);
}
return(ProcessMeasuredValue(achievement.CoreRequirements, expression, terms, out result));
}
result = new ParseErrorExpression("Value must be a constant or a memory accessor", expression);
return(false);
}
private ParseErrorExpression ExecuteAchievementMathematic(MathematicExpression mathematic, InterpreterScope scope)
{
var left = mathematic.Left;
var operation = mathematic.Operation;
var context = scope.GetContext <TriggerBuilderContext>();
ParseErrorExpression error;
ExpressionBase right;
if (!mathematic.Right.ReplaceVariables(scope, out right))
{
return((ParseErrorExpression)right);
}
if (operation == MathematicOperation.Subtract && (right is FunctionCallExpression || right is MathematicExpression))
{
// if subtracting a non-integer, swap the order to perform a SubSource
var newEqualityModifiers = new Stack <ValueModifier>();
var oldEqualityModifiers = _equalityModifiers;
_equalityModifiers = newEqualityModifiers;
var requirements = new List <Requirement>();
var innerContext = new TriggerBuilderContext()
{
Trigger = requirements
};
var innerScope = new InterpreterScope(scope)
{
Context = innerContext
};
// generate the condition for the right side
error = ExecuteAchievementExpression(right, innerScope);
_equalityModifiers = oldEqualityModifiers;
if (error != null)
{
return(error);
}
foreach (var requirement in requirements)
{
switch (requirement.Type)
{
case RequirementType.None:
case RequirementType.AddSource:
requirement.Type = RequirementType.SubSource;
break;
case RequirementType.SubSource:
requirement.Type = RequirementType.AddSource;
break;
default:
return(new ParseErrorExpression("Cannot normalize expression for negation", mathematic));
}
context.Trigger.Add(requirement);
}
foreach (var modifier in newEqualityModifiers)
{
switch (modifier.Operation)
{
case MathematicOperation.Add:
_equalityModifiers.Push(new ValueModifier(MathematicOperation.Subtract, modifier.Amount));
break;
case MathematicOperation.Subtract:
_equalityModifiers.Push(new ValueModifier(MathematicOperation.Add, modifier.Amount));
break;
default:
return(new ParseErrorExpression("Cannot normalize expression for negation", mathematic));
}
}
right = mathematic.Left;
operation = MathematicOperation.Add;
}
else
{
// generate the condition for the first expression
error = ExecuteAchievementExpression(left, scope);
if (error != null)
{
return(error);
}
}
var integerOperand = right as IntegerConstantExpression;
if (integerOperand != null)
{
var oppositeOperation = MathematicExpression.GetOppositeOperation(operation);
if (oppositeOperation == MathematicOperation.None)
{
return(new ParseErrorExpression(String.Format("Cannot normalize expression to eliminate {0}", MathematicExpression.GetOperatorType(mathematic.Operation)), mathematic));
}
var priority = MathematicExpression.GetPriority(mathematic.Operation);
if (priority != MathematicPriority.Add)
{
if (context.Trigger.Count > 1)
{
var previousRequirementType = context.Trigger.ElementAt(context.Trigger.Count - 2).Type;
if (previousRequirementType == RequirementType.AddSource || previousRequirementType == RequirementType.SubSource)
{
return(new ParseErrorExpression(String.Format("Cannot normalize expression to eliminate {0}", MathematicExpression.GetOperatorType(mathematic.Operation)), mathematic));
}
}
if (_equalityModifiers.Any(e => MathematicExpression.GetPriority(e.Operation) != priority))
{
return(new ParseErrorExpression(String.Format("Cannot normalize expression to eliminate {0}", MathematicExpression.GetOperatorType(mathematic.Operation)), mathematic));
}
}
_equalityModifiers.Push(new ValueModifier(oppositeOperation, integerOperand.Value));
return(null);
}
if (operation == MathematicOperation.Add)
{
foreach (var modifier in _equalityModifiers)
{
if (MathematicExpression.GetPriority(modifier.Operation) != MathematicPriority.Add)
{
return(new ParseErrorExpression(String.Format("Cannot normalize expression to eliminate {0}", MathematicExpression.GetOperatorType(MathematicExpression.GetOppositeOperation(modifier.Operation))), mathematic));
}
}
// adding two memory accessors - make sure previous is AddSource or SubSource
if (context.LastRequirement.Type != RequirementType.SubSource)
{
context.LastRequirement.Type = RequirementType.AddSource;
context.LastRequirement.Operator = RequirementOperator.None;
context.LastRequirement.Right = new Field();
}
}
else
{
return(new ParseErrorExpression(String.Format("Cannot normalize expression to eliminate {0}", MathematicExpression.GetOperatorType(mathematic.Operation)), mathematic));
}
// generate the condition for the second expression
error = ExecuteAchievementExpression(right, scope);
if (error != null)
{
error = new ParseErrorExpression(error.Message, mathematic);
}
return(error);
}
