public void ToString(StringBuilder builder)
{
builder.Append(StringTokens.TagOpen);
builder.Append(Tag);
builder.Append(StringTokens.ArgumentsOpen);
CaseSwitch.ToString(builder);
builder.Append(StringTokens.ArgumentsClose);
builder.Append(StringTokens.TagClose);
foreach (var caseValue in Cases)
{
builder.Append(StringTokens.TagOpen);
builder.Append(StringTokens.CaseTagName);
builder.Append(StringTokens.ArgumentsOpen);
builder.Append(caseValue.Key);
builder.Append(StringTokens.ArgumentsClose);
builder.Append(StringTokens.TagClose);
caseValue.Value.ToString(builder);
builder.Append(StringTokens.TagOpen);
builder.Append(StringTokens.ElementClose);
builder.Append(StringTokens.CaseTagName);
builder.Append(StringTokens.TagClose);
}
builder.Append(StringTokens.TagOpen);
builder.Append(StringTokens.ElementClose);
builder.Append(Tag);
builder.Append(StringTokens.TagClose);
}
public IExpression Evaluate(EvaluationParameters parameters)
{
var evalSwitch = CaseSwitch.TryEvaluate(parameters);
var asInt = parameters.FunctionProvider.ToInteger(evalSwitch);
INode caseNode;
if (!_Cases.TryGetValue(asInt, out caseNode))
{
throw new InvalidOperationException();
}
return(caseNode.TryEvaluate(parameters));
}
private void ParseCaseExpression(CaseExpression caseExpression)
{
while (Tokenizer.IsNextToken(Constants.When))
{
ReadNextToken();
CaseSwitch caseSwitch = new CaseSwitch(caseExpression);
caseSwitch.When = ReadCriteriaList(caseExpression);
Tokenizer.ExpectToken(Constants.Then);
caseSwitch.Then = ReadExpression(caseExpression);
caseExpression.Cases.Add(caseSwitch);
}
if (Tokenizer.IsNextToken(Constants.Else))
{
ReadNextToken();
caseExpression.Else = ReadExpression(caseExpression);
}
ExpectToken(Constants.End);
}
