public static Range GetRange(this CommonTree node, ITokenStream tokenStream, IReadOnlyScriptText scriptText)
{
if (node is CommonErrorNode errorNode)
{
return(new Range()
{
Start = scriptText.PositionAt(((CommonToken)tokenStream.Get(errorNode.start.TokenIndex)).StartIndex),
End = scriptText.PositionAt(((CommonToken)tokenStream.Get(errorNode.stop.TokenIndex)).StopIndex + 1)
});
}
if (node.TokenStartIndex == -1 || node.TokenStopIndex == -1)
{
return(Range.Empty);
}
return(new Range()
{
Start = scriptText.PositionAt(((CommonToken)tokenStream.Get(node.TokenStartIndex)).StartIndex),
End = scriptText.PositionAt(((CommonToken)tokenStream.Get(node.TokenStopIndex)).StopIndex + 1)
});
}
private T CreateNode <T>(SyntaxNode parent, Scanner <CommonTree> parentChildren, Action <T, Scanner <CommonTree> > bindAction = null, bool ignoreExceptions = false)
where T : SyntaxNode
{
var compilerNode = parentChildren.Current;
var range = compilerNode.GetRange(_tokenStream, _text);
if (compilerNode is CommonErrorNode errorNode)
{
_diagnostics.Add(errorNode.trappedException.ToDiagnostic(range));
}
var text = _text.GetTextInRange(range).TrimEnd();
var node = Activator.CreateInstance <T>();
node.Parent = parent;
node.Script = _scriptNode;
node.CompilerNode = compilerNode;
node.Text = text;
node.Range = new Range()
{
Start = range.Start,
End = _text.PositionAt(_text.OffsetAt(range.Start) + text.Length)
};
try
{
bindAction?.Invoke(node, new Scanner <CommonTree>(compilerNode.GetChildren()));
}
catch (Exception e)
{
if (!ignoreExceptions)
{
_diagnostics.Add(new Diagnostic(
DiagnosticLevel.Error, e.Message, Range.IsEmpty(node.Range) ? parent.Range : node.Range, e));
}
}
if (ShouldContractNodeEnd(node))
{
var lastChild = node.Children.LastOrDefault(c => c.Range != Range.Empty);
node.Range = new Range()
{
Start = node.Range.Start,
End = lastChild != null && lastChild.Range.End < node.Range.End ? lastChild.Range.End : node.Range.End,
};
}
// Expand parent to contain this child.
if (node.Range != Range.Empty)
{
parent.Range = new Range()
{
Start = parent.Range.Start > node.Range.Start ? node.Range.Start : parent.Range.Start,
End = parent.Range.End < node.Range.End ? node.Range.End : parent.Range.End,
};
}
var indexInParent = parent.Children.IndexOf(node);
if (indexInParent != 0)
{
var previousPeer = parent.Children[indexInParent - 1];
var leadingRange = new Range()
{
Start = previousPeer.Range.End,
End = node.Range.Start
};
node.LeadingText = _text.GetTextInRange(leadingRange);
}
return(node);
}