public void ParseContextualMatches(Capture contextualMatchInput, Func <char, int> symbolRemapper)
{
var contextualMatchSection = contextualMatchInput.Value;
var contextualMatch = Regex.Match(contextualMatchSection, @"(?:(?<prefix>[^<>]+)\s*<\s*)?(?<target>[^<>]+)(?:\s*>(?<suffix>[^<>]+))?");
if (!contextualMatch.Success || !contextualMatch.Groups["target"].Success)
{
throw new SyntaxException("Must specify a single target symbol", contextualMatchInput);
}
var targetSymbols = InputSymbolParser.ParseInputSymbols(contextualMatch.Groups["target"].Value, symbolRemapper);
if (targetSymbols.Length != 1)
{
throw new SyntaxException("Multi match target symbols are not supported. Convert this rule into mutliple context-sensitive rules.", contextualMatch.Groups["target"]);
}
coreSymbol = targetSymbols[0];
if (contextualMatch.Groups["prefix"].Success)
{
backwardsMatch = InputSymbolParser.ParseInputSymbols(contextualMatch.Groups["prefix"].Value, symbolRemapper);
}
else
{
backwardsMatch = new InputSymbol[0];
}
if (contextualMatch.Groups["suffix"].Success)
{
forwardsMatch = InputSymbolParser.ParseInputSymbols(contextualMatch.Groups["suffix"].Value, symbolRemapper);
}
else
{
forwardsMatch = new InputSymbol[0];
}
}
public override int GetHashCode()
{
unchecked
{
var hashCode = InputState != null?InputState.GetHashCode() : 0;
hashCode = (hashCode * 397) ^ (InputSymbol != null ? InputSymbol.GetHashCode() : 0);
hashCode = (hashCode * 397) ^ (ResultStates != null ? ResultStates.GetHashCode() : 0);
return(hashCode);
}
}
private bool TryParseInputSymbol(string inputSymbol,
out IdentifierNode identifier,
out AssociativeNode defaultValue)
{
identifier = null;
defaultValue = null;
// workaround: there is an issue in parsing "x:int" format unless
// we create the other parser specially for it. We change it to
// "x:int = dummy;" for parsing.
var parseString = InputSymbol;
// if it has default value, then append ';'
if (InputSymbol.Contains("="))
{
parseString += ";";
}
else
{
String dummyExpression = "{0}=dummy;";
parseString = string.Format(dummyExpression, parseString);
}
ParseParam parseParam = new ParseParam(this.GUID, parseString);
if (EngineController.CompilationServices.PreCompileCodeBlock(ref parseParam) &&
parseParam.ParsedNodes != null &&
parseParam.ParsedNodes.Any())
{
var node = parseParam.ParsedNodes.First() as BinaryExpressionNode;
Validity.Assert(node != null);
if (node != null)
{
identifier = node.LeftNode as IdentifierNode;
if (inputSymbol.Contains('='))
{
defaultValue = node.RightNode;
}
return(identifier != null);
}
}
return(false);
}
