public ConstraintDescription Parse(string constraint)
{
state = ConstraintParserState.firstChar;
word.Clear();
prototype = new ConstraintDescription();
prototype.Terms = new List <ConstraintSegment>();
errorMessage = null;
hasLeadNumber = false;
eqRelationDefined = false;
int charNumber = 0;
foreach (var ch in constraint.Append('\0'))
{
if (char.IsWhiteSpace(ch))
{
charNumber++;
continue;
}
state = stateTable[state](state, ch);
if (state == ConstraintParserState.syntaxError)
{
throw new SyntaxErrorException($"{errorMessage} at char {charNumber}");
}
charNumber++;
}
if (!prototype.Terms.Any(x => x.OwnerId != null))
{
throw new SemanticErrorException($"parsed expression does not contains anchors");
}
if (state != ConstraintParserState.done)
{
throw new InternalErrorException($"parser ended work in invalid state: {state}");
}
return(prototype);
}
public ConstraintPrototype(XmlElement node) : base(node)
{
Strength = node.HasAttribute("strength") ? GetStrength(node.GetAttribute("strength")) : ClStrength.Default;
Constraint = new ConstraintParser().Parse(node.InnerText.Trim(" \n\r\t".ToCharArray()));
}