private static void AddNodes(TreeNodeCollection treeNodes, RegexNode regexNode)
{
var treeNode = treeNodes.Add(
regexNode.Id.ToString(CultureInfo.InvariantCulture),
string.Format("{0} - {1}", regexNode.Pattern, regexNode.NodeType));
if (regexNode is LeafNode)
{
return;
}
var wrapperNode = regexNode as WrapperNode;
if (wrapperNode != null)
{
AddNodes(treeNode.Nodes, (wrapperNode).Child);
}
var containerNode = regexNode as ContainerNode;
if (containerNode != null)
{
foreach (var child in (containerNode).Children)
{
AddNodes(treeNode.Nodes, child);
}
}
var alternation = regexNode as Alternation;
if (alternation != null)
{
foreach (var choice in (alternation).Choices)
{
AddNodes(treeNode.Nodes, choice);
}
}
}
internal static ParseStep Fail(RegexNode node, State initialState, State currentState, string additionalMessage = null)
{
return new ParseStep
{
Type = ParseStepType.Fail,
Node = node,
InitialState = initialState,
CurrentState = currentState
}.WithMessage(step => (additionalMessage != null ? additionalMessage + ": " : "") + node.GetFailMessage(step.InitialState));
}
internal static ParseStep EndOfString(RegexNode node, State currentState)
{
return new ParseStep
{
Type = ParseStepType.EndOfString,
Node = node,
CurrentState = currentState
}.WithMessage(step => "End of string");
}
internal static ParseStep CaptureDiscarded(RegexNode node, string capturedText, int captureNumber)
{
return new ParseStep
{
Type = ParseStepType.CaptureDiscarded,
Node = node,
MatchedText = capturedText,
CaptureNumber = captureNumber
}.WithMessage(step =>
string.Format(
"Discarded captured text, '{0}' (capture number: {1})",
step.MatchedText,
step.CaptureNumber));
}
internal static ParseStep Capture(RegexNode node, string capturedText, int captureNumber, State initialState, State currentState)
{
return new ParseStep
{
Type = ParseStepType.Capture,
Node = node,
MatchedText = capturedText,
CaptureNumber = captureNumber,
InitialState = initialState,
CurrentState = currentState
}.WithMessage(step =>
string.Format(
"Captured '{0}' (capture number: {1}) starting at index {2}",
step.MatchedText,
step.CaptureNumber,
step.InitialState.Index));
}
internal static ParseStep Break(RegexNode node)
{
return new ParseStep
{
Type = ParseStepType.Break,
Node = node
};
}
internal static ParseStep Backtrack(RegexNode node, State initialState, State backtrackState)
{
return new ParseStep
{
Type = ParseStepType.Backtrack,
Node = node,
InitialState = initialState,
CurrentState = backtrackState
}.WithMessage(step => string.Format("Backtracking to {0}", step.CurrentState.Index));
}
private static RegexNode CreateQuantifier(QuantifierParams quantifierParams,
RegexNode child,
int index,
string pattern)
{
if (quantifierParams.Shorthand != null)
{
switch (quantifierParams.Shorthand)
{
case '?':
if (quantifierParams.Optional != null)
{
if (quantifierParams.Optional == '?')
{
return new LazyQuestionMark(child, index, pattern);
}
return new PossessiveQuestionMark(child, index, pattern);
}
return new GreedyQuestionMark(child, index, pattern);
case '*':
if (quantifierParams.Optional != null)
{
if (quantifierParams.Optional == '?')
{
return new LazyStar(child, index, pattern);
}
return new PossessiveStar(child, index, pattern);
}
return new GreedyStar(child, index, pattern);
case '+':
if (quantifierParams.Optional != null)
{
if (quantifierParams.Optional == '?')
{
return new LazyPlus(child, index, pattern);
}
return new PossessivePlus(child, index, pattern);
}
return new GreedyPlus(child, index, pattern);
}
}
Debug.Assert(quantifierParams.Min != null);
if (quantifierParams.Optional != null)
{
if (quantifierParams.Optional == '?')
{
return new LazyQuantifier(quantifierParams.Min.Value, quantifierParams.Max, child, index, pattern);
}
return new PossessiveQuantifier(quantifierParams.Min.Value, quantifierParams.Max, child, index, pattern);
}
return new GreedyQuantifier(quantifierParams.Min.Value, quantifierParams.Max, child, index, pattern);
}
public ParseStep ConvertToOuterContext(string input, int indexModifier, RegexNode regexNode, Func<RegexNode, bool> changeNodePredicate, Func<string, string> modifyMessageFunction)
{
if (changeNodePredicate(Node))
{
Node = regexNode;
var originalGetMessage = _getMessage;
_getMessage = step => modifyMessageFunction(originalGetMessage(step));
}
InitialState = InitialState == null ? null : new State(input, InitialState.Index + indexModifier);
CurrentState = CurrentState == null ? null : new State(input, CurrentState.Index + indexModifier);
return this;
}
public static ParseStep StartLookaround(RegexNode node, State currentState)
{
return new ParseStep
{
Type = ParseStepType.LookaroundStart,
Node = node,
CurrentState = currentState
}.WithMessage(step => "Look-around started");
}
public static ParseStep ResetIndex(RegexNode node, State initialState, State currentState)
{
return new ParseStep
{
Type = ParseStepType.ResetIndex,
Node = node,
InitialState = initialState,
CurrentState = currentState
}.WithMessage(step => string.Format("Resetting index to {0}", step.InitialState.Index));
}
public static ParseStep EndLookaround(RegexNode node)
{
return new ParseStep
{
Type = ParseStepType.LookaroundEnd,
Node = node
}.WithMessage(step => "Look-around ended");
}
public static ParseStep BeginParse(RegexNode node, State initialState)
{
return new ParseStep
{
Type = ParseStepType.BeginParse,
Node = node,
InitialState = initialState
}.WithMessage(step => "Parse started");
}
internal static ParseStep Pass(RegexNode node, string matchedText, State initialState, State currentState)
{
return new ParseStep
{
Type = ParseStepType.Pass,
Node = node,
MatchedText = matchedText,
InitialState = initialState,
CurrentState = currentState
}.WithMessage(step => node.GetPassMessage(step.MatchedText, step.InitialState));
}
internal static ParseStep AdvanceIndex(RegexNode node, State state)
{
return new ParseStep
{
Type = ParseStepType.AdvanceIndex,
Node = node,
CurrentState = state,
}.WithMessage(step => string.Format("Advanced index to {0}", step.CurrentState.Index));
}
internal static ParseStep StateSaved(RegexNode node, State currentState, string message)
{
return new ParseStep
{
Type = ParseStepType.StateSaved,
Node = node,
CurrentState = currentState
}.WithMessage(step => message);
}
private static void AssignNodeIdsAndCapturingNumbers(RegexNode node, ref int nextId, ref int nextCapturingNumber)
{
node.Id = nextId++;
var containerNode = node as ContainerNode;
if (containerNode != null)
{
var capturingParens = node as CapturingParens;
if (capturingParens != null)
{
capturingParens.Number = nextCapturingNumber++;
}
foreach (var child in containerNode.Children)
{
AssignNodeIdsAndCapturingNumbers(child, ref nextId, ref nextCapturingNumber);
}
}
else
{
var wrapperNode = node as WrapperNode;
if (wrapperNode != null)
{
AssignNodeIdsAndCapturingNumbers(wrapperNode.Child, ref nextId, ref nextCapturingNumber);
}
else
{
var alternation = node as Alternation;
if (alternation != null)
{
foreach (var choice in alternation.Choices)
{
AssignNodeIdsAndCapturingNumbers(choice, ref nextId, ref nextCapturingNumber);
}
}
}
}
}
