private static IDictionary <int, MessageValidationRule> GetRules(Func <string, string>?modifier = null)
{
var rulesText = ReadSection(0).Select(modifier ?? (s => s))
.ToArray();
return(MessageValidationRule.ReadRules(rulesText));
}
private ValidateResult[] Validate(MessageValidationRule rule, string message, int position)
{
if (position >= message.Length)
{
return(Array.Empty <ValidateResult>());
}
if (rule is MatchMessageValidationRule matchRule)
{
var isValid = matchRule.Value == message[position];
return(isValid
? new[] { new ValidateResult(true, 1) }
: Array.Empty <ValidateResult>());
}
if (rule is CompositeMessageValidationRule compositeRule)
{
var allValidChildResults = new List <ValidateResult>();
foreach (var ruleSet in compositeRule.ChildRuleSets)
{
var previous = new List <ValidateResult> {
new ValidateResult(true, 0)
};
foreach (var childRule in ruleSet)
{
previous = previous.SelectMany(
p => Validate(childRule, message, position + p.Consumed)
.Where(r => r.IsValid)
.Select(r => new ValidateResult(true, r.Consumed + p.Consumed)))
.ToList();
}
allValidChildResults.AddRange(previous);
}
return(allValidChildResults.ToArray());
}
throw new ArgumentException($"Unrecognised rule type: {rule.GetType().Name}");
}