/// <summary>Normalise and parse the given condition values.</summary>
/// <param name="raw">The raw condition values to normalise.</param>
/// <param name="tokenContext">The tokens available for this content pack.</param>
/// <param name="formatVersion">The format version specified by the content pack.</param>
/// <param name="latestFormatVersion">The latest format version.</param>
/// <param name="minumumTokenVersions">The minimum format versions for newer condition types.</param>
/// <param name="conditions">The normalised conditions.</param>
/// <param name="error">An error message indicating why normalisation failed.</param>
private bool TryParseConditions(InvariantDictionary <string> raw, IContext tokenContext, ISemanticVersion formatVersion, ISemanticVersion latestFormatVersion, InvariantDictionary <ISemanticVersion> minumumTokenVersions, out ConditionDictionary conditions, out string error)
{
conditions = new ConditionDictionary();
// no conditions
if (raw == null || !raw.Any())
{
error = null;
return(true);
}
// parse conditions
foreach (KeyValuePair <string, string> pair in raw)
{
// parse condition key
if (!TokenName.TryParse(pair.Key, out TokenName name))
{
error = $"'{pair.Key}' isn't a valid token name";
conditions = null;
return(false);
}
// get token
IToken token = tokenContext.GetToken(name, enforceContext: false);
if (token == null)
{
error = $"'{pair.Key}' isn't a valid condition; must be one of {string.Join(", ", tokenContext.GetTokens(enforceContext: false).Select(p => p.Name).OrderBy(p => p))}";
conditions = null;
return(false);
}
// validate subkeys
if (!token.CanHaveSubkeys)
{
if (name.HasSubkey())
{
error = $"{name.Key} conditions don't allow subkeys (:)";
conditions = null;
return(false);
}
}
else if (token.RequiresSubkeys)
{
if (!name.HasSubkey())
{
error = $"{name.Key} conditions must specify a token subkey (see readme for usage)";
conditions = null;
return(false);
}
}
// check compatibility
if (minumumTokenVersions.TryGetValue(name.Key, out ISemanticVersion minVersion) && minVersion.IsNewerThan(formatVersion))
{
error = $"{name} isn't available with format version {formatVersion} (change the {nameof(ContentConfig.Format)} field to {latestFormatVersion} to use newer features)";
conditions = null;
return(false);
}
// parse values
InvariantHashSet values = this.ParseCommaDelimitedField(pair.Value);
if (!values.Any())
{
error = $"{name} can't be empty";
conditions = null;
return(false);
}
// restrict to allowed values
InvariantHashSet rawValidValues = token.GetAllowedValues(name);
if (rawValidValues?.Any() == true)
{
InvariantHashSet validValues = new InvariantHashSet(rawValidValues);
{
string[] invalidValues = values.ExceptIgnoreCase(validValues).ToArray();
if (invalidValues.Any())
{
error = $"invalid {name} values ({string.Join(", ", invalidValues)}); expected one of {string.Join(", ", validValues)}";
conditions = null;
return(false);
}
}
}
// perform custom validation
if (!token.TryCustomValidation(values, out string customError))
{
error = $"invalid {name} values: {customError}";
conditions = null;
return(false);
}
// create condition
conditions[name] = new Condition(name, values);
}
// return parsed conditions
error = null;
return(true);
}