/// <summary>
/// Populates an achievement from an expression.
/// </summary>
/// <param name="achievement">The achievement to populate.</param>
/// <param name="expression">The expression to populate from.</param>
/// <param name="scope">The scope.</param>
/// <param name="result">[out] The error if not successful.</param>
/// <returns><c>true</c> if successful, <c>false</c> if not.</returns>
public static bool ProcessAchievementConditions(ScriptInterpreterAchievementBuilder achievement, ExpressionBase expression, InterpreterScope scope, out ExpressionBase result)
{
ParseErrorExpression parseError;
if (!achievement.PopulateFromExpression(expression, scope, out parseError))
{
result = parseError;
return(false);
}
var message = achievement.Optimize();
if (message != null)
{
result = new ParseErrorExpression(message, expression);
return(false);
}
result = null;
return(true);
}
/// <summary>
/// Populates an achievement from an expression.
/// </summary>
/// <param name="achievement">The achievement to populate.</param>
/// <param name="expression">The expression to populate from.</param>
/// <param name="scope">The scope.</param>
/// <param name="result">[out] The error if not successful.</param>
/// <returns><c>true</c> if successful, <c>false</c> if not.</returns>
public static bool ProcessAchievementConditions(ScriptInterpreterAchievementBuilder achievement, ExpressionBase expression, InterpreterScope scope, out ExpressionBase result)
{
ParseErrorExpression parseError;
if (!achievement.PopulateFromExpression(expression, scope, out parseError))
{
result = parseError;
return(false);
}
// only optimize at the outermost level
if (ReferenceEquals(scope.GetOutermostContext <TriggerBuilderContext>(), scope.GetContext <TriggerBuilderContext>()))
{
var message = achievement.Optimize();
if (message != null)
{
result = new ParseErrorExpression(message, expression);
return(false);
}
}
result = null;
return(true);
}
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);
}