protected T Parse <T>(IRunner runner, string data) where T : class
{
var captures = new List <Capture>();
var result = runner.Run(data, captures);
if (result.IsSuccessful)
{
var iterator = new CaptureIterator <Expression>(data, captures);
var output = BuildTree(iterator);
if (output as T == null)
{
throw new PegParsingException($"Unable to parse PEG: {output}");
}
return(output as T);
}
else
{
var near = data.Substring(result.InputPosition);
if (near.Length > 10)
{
near = near.Substring(0, 10);
}
throw new PegParsingException($"Parsing error at character {result.InputPosition}. {runner.ExplainResult(result, data)} near {near}");
}
}
private Expression BuildTree(CaptureIterator <Expression> iterator)
{
var result = iterator.Iterate(BuildTreeNode).ToList();
if (result.Count != 1)
{
throw new PegParsingException($"Parsed {result.Count} regex expressions, expected 1 expression.");
}
return(result.First());
}
public Node ToNodes()
{
var iterator = new CaptureIterator <Node>(InputData, Captures);
var result = iterator.Iterate(BuildNode).ToList();
if (result.Count == 1)
{
return(result[0]);
}
else
{
return(new ListNode("matches", result));
}
}
