private RegexFactor VisitRegexFactorNode(IInternalTreeNode internalNode)
{
RegexAtom atom = null;
RegexIterator?iterator = null;
for (var c = 0; c < internalNode.Children.Count; c++)
{
var child = internalNode.Children[c];
if (child.NodeType != TreeNodeType.Internal)
{
continue;
}
var childInternalNode = child as IInternalTreeNode;
var childInternalNodeSymbolValue = childInternalNode.Symbol.Value;
if (RegexGrammar.Atom == childInternalNodeSymbolValue)
{
atom = VisitRegexAtomNode(childInternalNode);
}
else if (RegexGrammar.Iterator == childInternalNodeSymbolValue)
{
iterator = VisitRegexIteratorNode(childInternalNode);
}
}
if (iterator.HasValue)
{
return(new RegexFactorIterator(
atom,
iterator.Value));
}
return(new RegexFactor(atom));
}
private EbnfBlockRule VisitRuleNode(IInternalTreeNode node)
{
EbnfQualifiedIdentifier qualifiedIdentifier = null;
EbnfExpression expression = null;
for (int c = 0; c < node.Children.Count; c++)
{
var child = node.Children[c];
switch (child.NodeType)
{
case TreeNodeType.Internal:
var internalNode = child as IInternalTreeNode;
var symbolValue = internalNode.Symbol.Value;
if (EbnfGrammar.QualifiedIdentifier == symbolValue)
{
qualifiedIdentifier = VisitQualifiedIdentifierNode(internalNode);
}
else if (EbnfGrammar.Expression == symbolValue)
{
expression = VisitExpressionNode(internalNode);
}
break;
case TreeNodeType.Token:
break;
}
}
return(new EbnfBlockRule(
new EbnfRule(qualifiedIdentifier, expression)));
}
private RegexExpression VisitRegexExpressionNode(IInternalTreeNode node)
{
RegexExpression expression = null;
IRegexTerm term = null;
foreach (var internalNode in node.Children.OfType <IInternalTreeNode>())
{
if (internalNode.Is(RegexGrammar.Expression))
{
expression = VisitRegexExpressionNode(internalNode);
}
else if (internalNode.Is(RegexGrammar.Term))
{
term = VisitRegexTermNode(internalNode);
}
}
if (expression != null && term != null)
{
return(new RegexExpressionAlteration(term, expression));
}
if (term != null)
{
return(new RegexExpressionTerm(term));
}
throw new InvalidOperationException("Unable to create null expression.");
}
public override void Visit(IInternalTreeNode node)
{
if (node.Is(RegexGrammar.Regex))
{
Regex = VisitRegexNode(node);
}
}
private static RegexCharacters VisitCharacterRangeNode(IInternalTreeNode node)
{
RegexCharacterClassCharacter start = null;
RegexCharacterClassCharacter end = null;
foreach (var internalNode in node.Children.OfType <IInternalTreeNode>())
{
if (internalNode.Is(RegexGrammar.CharacterClassCharacter))
{
if (start == null)
{
start = VisitCharacterClassCharacterNode(internalNode);
}
else
{
end = VisitCharacterClassCharacterNode(internalNode);
}
}
}
if (end == null)
{
return(new RegexCharactersUnit(start));
}
return(new RegexCharactersRange(start, end));
}
private EbnfBlockSetting VisitSettingNode(IInternalTreeNode node)
{
EbnfSettingIdentifier settingIdentifier = null;
EbnfQualifiedIdentifier qualifiedEbnfQualifiedIdentifier = null;
foreach (var child in node.Children)
{
switch (child)
{
case IInternalTreeNode internalNode:
if (internalNode.Is(EbnfGrammar.QualifiedIdentifier))
{
qualifiedEbnfQualifiedIdentifier = VisitQualifiedIdentifierNode(internalNode);
}
break;
case ITokenTreeNode tokenNode:
var token = tokenNode.Token;
if (token.TokenName.Equals(EbnfGrammar.TokenClasses.SettingIdentifier))
{
settingIdentifier = new EbnfSettingIdentifier(token.Value);
}
break;
}
}
return(new EbnfBlockSetting(new EbnfSetting(settingIdentifier, qualifiedEbnfQualifiedIdentifier)));
}
private RegexSet VisitRegexSetNode(IInternalTreeNode internalNode)
{
for (var c = 0; c < internalNode.Children.Count; c++)
{
var child = internalNode.Children[c];
if (child.NodeType != TreeNodeType.Internal)
{
continue;
}
var childInternalNode = child as IInternalTreeNode;
var childInternalNodeSymbolValue = childInternalNode.Symbol.Value;
if (RegexGrammar.PositiveSet == childInternalNodeSymbolValue)
{
return(VisitInnerSetNode(false, childInternalNode));
}
else if (RegexGrammar.NegativeSet == childInternalNodeSymbolValue)
{
return(VisitInnerSetNode(true, childInternalNode));
}
}
throw new Exception("Invalid Set Detected.");
}
private static ICapture <char> VisitLiteralNode(IInternalTreeNode node)
{
for (int c = 0; c < node.Children.Count; c++)
{
var child = node.Children[c];
switch (child.NodeType)
{
case TreeNodeType.Token:
var tokenNode = child as ITokenTreeNode;
var token = tokenNode.Token;
var tokenType = token.TokenType;
// if token type is string token type remove surrounding quotes
if (tokenType.Equals(SingleQuoteStringLexerRule.TokenTypeDescriptor) ||
tokenType.Equals(DoubleQuoteStringLexerRule.TokenTypeDescriptor))
{
return(token.Capture.Slice(1, token.Capture.Count - 2));
}
// TODO: Find a better solution for identifing the lexer rule based on id
if (tokenNode.Token.TokenType.Id.Length > 5)
{
return(token.Capture);
}
break;
case TreeNodeType.Internal:
break;
}
}
throw UnreachableCodeException();
}
private EbnfDefinition VisitDefinitionNode(IInternalTreeNode node)
{
EbnfBlock block = null;
EbnfDefinition definition = null;
for (int c = 0; c < node.Children.Count; c++)
{
var child = node.Children[c];
switch (child.NodeType)
{
case TreeNodeType.Internal:
var internalNode = child as IInternalTreeNode;
var symbolValue = internalNode.Symbol.Value;
if (EbnfGrammar.Block == symbolValue)
{
block = VisitBlockNode(internalNode);
}
else if (EbnfGrammar.Definition == symbolValue)
{
definition = VisitDefinitionNode(internalNode);
}
break;
}
}
if (definition != null)
{
return(new EbnfDefinitionConcatenation(block, definition));
}
return(new EbnfDefinition(block));
}
public override void Visit(IInternalTreeNode node)
{
if (RegexGrammar.Regex == node.Symbol.Value)
{
Regex = VisitRegexNode(node);
}
}
public override void Visit(IInternalTreeNode node)
{
if (EbnfGrammar.Definition == node.Symbol.Value)
{
Definition = VisitDefinitionNode(node);
}
}
private RegexCharacterClass VisitCharacterClassNode(IInternalTreeNode internalNode)
{
RegexCharacterUnitRange characterRange = null;
RegexCharacterClass characterClass = null;
for (var c = 0; c < internalNode.Children.Count; c++)
{
var child = internalNode.Children[c];
if (child.NodeType != TreeNodeType.Internal)
continue;
var childInternalNode = child as IInternalTreeNode;
var childInternalNodeSymbolValue = childInternalNode.Symbol.Value;
if (RegexGrammar.CharacterRange == childInternalNodeSymbolValue)
characterRange = VisitCharacterRangeNode(childInternalNode);
else if (RegexGrammar.CharacterClass == childInternalNodeSymbolValue)
characterClass = VisitCharacterClassNode(childInternalNode);
}
if (characterClass != null)
return new RegexCharacterClassAlteration(
characterRange,
characterClass);
return new RegexCharacterClass(characterRange);
}
public virtual void Visit(IInternalTreeNode node)
{
foreach (var child in node.Children)
{
child.Accept(this);
}
}
private EbnfExpression VisitExpressionNode(IInternalTreeNode node)
{
EbnfTerm term = null;
EbnfExpression expression = null;
for (int c = 0; c < node.Children.Count; c++)
{
var child = node.Children[c];
switch (child.NodeType)
{
case TreeNodeType.Internal:
var internalNode = child as IInternalTreeNode;
var symbolValue = internalNode.Symbol.Value;
if (EbnfGrammar.Term == symbolValue)
{
term = VisitTermNode(internalNode);
}
else if (EbnfGrammar.Expression == symbolValue)
{
expression = VisitExpressionNode(internalNode);
}
break;
case TreeNodeType.Token:
break;
}
}
if (expression == null)
{
return(new EbnfExpression(term));
}
return(new EbnfExpressionAlteration(term, expression));
}
private EbnfBlockSetting VisitSettingNode(IInternalTreeNode node)
{
EbnfSettingIdentifier settingIdentifier = null;
EbnfQualifiedIdentifier qualifiedIdentifier = null;
for (int c = 0; c < node.Children.Count; c++)
{
var child = node.Children[c];
switch (child.NodeType)
{
case TreeNodeType.Token:
var tokenNode = child as ITokenTreeNode;
var token = tokenNode.Token;
if (token.TokenType.Id == nameof(settingIdentifier))
{
settingIdentifier = new EbnfSettingIdentifier(token.Value);
}
break;
case TreeNodeType.Internal:
var internalNode = child as IInternalTreeNode;
var symbolValue = internalNode.Symbol.Value;
if (EbnfGrammar.QualifiedIdentifier == symbolValue)
{
qualifiedIdentifier = VisitQualifiedIdentifierNode(internalNode);
}
break;
}
}
return(new EbnfBlockSetting(
new EbnfSetting(settingIdentifier, qualifiedIdentifier)));
}
public override void Visit(IInternalTreeNode node)
{
if (node.Is(EbnfGrammar.Definition))
{
Definition = VisitDefinitionNode(node);
}
}
private EbnfLexerRuleExpression VisitLexerRuleExpressionNode(IInternalTreeNode node)
{
EbnfLexerRuleTerm term = null;
EbnfLexerRuleExpression expression = null;
for (int c = 0; c < node.Children.Count; c++)
{
var child = node.Children[c];
if (child.NodeType != TreeNodeType.Internal)
{
continue;
}
var internalNode = child as IInternalTreeNode;
var symbolValue = internalNode.Symbol.Value;
if (EbnfGrammar.LexerRuleTerm == symbolValue)
{
term = VisitLexerRuleTermNode(internalNode);
}
if (EbnfGrammar.LexerRuleExpression == symbolValue)
{
expression = VisitLexerRuleExpressionNode(internalNode);
}
}
if (expression == null)
{
return(new EbnfLexerRuleExpression(term));
}
return(new EbnfLexerRuleExpressionAlteration(term, expression));
}
private EbnfBlockLexerRule VisitLexerRuleNode(IInternalTreeNode node)
{
EbnfQualifiedIdentifier qualifiedIdentifier = null;
EbnfLexerRuleExpression expression = null;
for (int c = 0; c < node.Children.Count; c++)
{
var child = node.Children[c];
if (child.NodeType != TreeNodeType.Internal)
{
continue;
}
var internalNode = child as IInternalTreeNode;
var symbolValue = internalNode.Symbol.Value;
if (EbnfGrammar.QualifiedIdentifier == symbolValue)
{
qualifiedIdentifier = VisitQualifiedIdentifierNode(internalNode);
}
else if (EbnfGrammar.LexerRuleExpression == symbolValue)
{
expression = VisitLexerRuleExpressionNode(internalNode);
}
}
return(new EbnfBlockLexerRule(
new EbnfLexerRule(qualifiedIdentifier, expression)));
}
private EbnfLexerRuleTerm VisitLexerRuleTermNode(IInternalTreeNode node)
{
EbnfLexerRuleFactor factor = null;
EbnfLexerRuleTerm term = null;
for (int c = 0; c < node.Children.Count; c++)
{
var child = node.Children[c];
if (child.NodeType != TreeNodeType.Internal)
{
continue;
}
var internalNode = child as IInternalTreeNode;
var symbolValue = internalNode.Symbol.Value;
if (EbnfGrammar.LexerRuleFactor == symbolValue)
{
factor = VisitLexerRuleFactorNode(internalNode);
}
if (EbnfGrammar.LexerRuleTerm == symbolValue)
{
term = VisitLexerRuleTermNode(internalNode);
}
}
if (term == null)
{
return(new EbnfLexerRuleTerm(factor));
}
return(new EbnfLexerRuleTermConcatenation(factor, term));
}
private static EbnfLexerRuleFactor VisitLexerRuleFactorNode(IInternalTreeNode node)
{
for (int c = 0; c < node.Children.Count; c++)
{
var child = node.Children[c];
if (child.NodeType != TreeNodeType.Internal)
{
continue;
}
var internalNode = child as IInternalTreeNode;
var symbolValue = internalNode.Symbol.Value;
if (EbnfGrammar.Literal == symbolValue)
{
return(new EbnfLexerRuleFactorLiteral(
VisitLiteralNode(internalNode)));
}
if (RegexGrammar.Regex == symbolValue)
{
var regexVisitor = new RegexVisitor();
internalNode.Accept(regexVisitor);
return(new EbnfLexerRuleFactorRegex(regexVisitor.Regex));
}
}
throw UnreachableCodeException();
}
private EbnfBlock VisitBlockNode(IInternalTreeNode node)
{
for (int c = 0; c < node.Children.Count; c++)
{
var child = node.Children[c];
switch (child.NodeType)
{
case TreeNodeType.Internal:
var internalNode = child as IInternalTreeNode;
var symbolValue = internalNode.Symbol.Value;
if (EbnfGrammar.Rule == symbolValue)
{
return(VisitRuleNode(internalNode));
}
if (EbnfGrammar.Setting == symbolValue)
{
return(VisitSettingNode(internalNode));
}
if (EbnfGrammar.LexerRule == symbolValue)
{
return(VisitLexerRuleNode(internalNode));
}
break;
}
}
throw UnreachableCodeException();
}
private static RegexCharacterUnitRange VisitCharacterRangeNode(IInternalTreeNode internalNode)
{
RegexCharacterClassCharacter start = null;
RegexCharacterClassCharacter end = null;
for (var c = 0; c < internalNode.Children.Count; c++)
{
var child = internalNode.Children[c];
if (child.NodeType != TreeNodeType.Internal)
continue;
var childInternalNode = child as IInternalTreeNode;
var childInternalNodeSymbolValue = childInternalNode.Symbol.Value;
if (RegexGrammar.CharacterClassCharacter == childInternalNodeSymbolValue)
{
if (start == null)
start = VisitCharacterClassCharacterNode(childInternalNode);
else
end = VisitCharacterClassCharacterNode(childInternalNode);
}
}
if (end != null)
return new RegexCharacterRange(start, end);
return new RegexCharacterUnitRange(start);
}
private EbnfTerm VisitTermNode(IInternalTreeNode node)
{
EbnfFactor factor = null;
EbnfTerm term = null;
for (int c = 0; c < node.Children.Count; c++)
{
var child = node.Children[c];
switch (child.NodeType)
{
case TreeNodeType.Internal:
var internalNode = child as IInternalTreeNode;
var symbolValue = internalNode.Symbol.Value;
if (EbnfGrammar.Factor == symbolValue)
{
factor = VisitFactorNode(internalNode);
}
else if (EbnfGrammar.Term == symbolValue)
{
term = VisitTermNode(internalNode);
}
break;
case TreeNodeType.Token:
break;
}
}
if (term == null)
{
return(new EbnfTerm(factor));
}
return(new EbnfTermConcatenation(factor, term));
}
private RegexTerm VisitRegexTermNode(IInternalTreeNode internalNode)
{
RegexFactor factor = null;
RegexTerm term = null;
for (var c = 0; c < internalNode.Children.Count; c++)
{
var child = internalNode.Children[c];
if (child.NodeType != TreeNodeType.Internal)
{
continue;
}
var childInternalNode = child as IInternalTreeNode;
var childInternalNodeSymbolValue = childInternalNode.Symbol.Value;
if (RegexGrammar.Factor == childInternalNodeSymbolValue)
{
factor = VisitRegexFactorNode(childInternalNode);
}
else if (RegexGrammar.Term == childInternalNodeSymbolValue)
{
term = VisitRegexTermNode(childInternalNode);
}
}
if (term == null)
{
return(new RegexTerm(factor));
}
return(new RegexTermFactor(factor, term));
}
private IEnumerable <string> VisitQualifiedIdentifier(IInternalTreeNode node)
{
foreach (var child in node.Children)
{
switch (child)
{
case IInternalTreeNode internalNode:
if (internalNode.Is(EbnfGrammar.QualifiedIdentifier))
{
foreach (var identifier in VisitQualifiedIdentifier(internalNode))
{
yield return(identifier);
}
}
break;
case ITokenTreeNode tokenNode:
var token = tokenNode.Token;
if (token.TokenName.Equals(EbnfGrammar.TokenClasses.Identifier))
{
yield return(token.Value);
}
break;
}
}
}
private static RegexCharacterUnitRange VisitCharacterRangeNode(IInternalTreeNode internalNode)
{
RegexCharacterClassCharacter start = null;
RegexCharacterClassCharacter end = null;
for (var c = 0; c < internalNode.Children.Count; c++)
{
var child = internalNode.Children[c];
if (child.NodeType != TreeNodeType.Internal)
{
continue;
}
var childInternalNode = child as IInternalTreeNode;
var childInternalNodeSymbolValue = childInternalNode.Symbol.Value;
if (RegexGrammar.CharacterClassCharacter == childInternalNodeSymbolValue)
{
if (start == null)
{
start = VisitCharacterClassCharacterNode(childInternalNode);
}
else
{
end = VisitCharacterClassCharacterNode(childInternalNode);
}
}
}
if (end != null)
{
return(new RegexCharacterRange(start, end));
}
return(new RegexCharacterUnitRange(start));
}
private RegexCharacterClass VisitCharacterClassNode(IInternalTreeNode internalNode)
{
RegexCharacterUnitRange characterRange = null;
RegexCharacterClass characterClass = null;
for (var c = 0; c < internalNode.Children.Count; c++)
{
var child = internalNode.Children[c];
if (child.NodeType != TreeNodeType.Internal)
{
continue;
}
var childInternalNode = child as IInternalTreeNode;
var childInternalNodeSymbolValue = childInternalNode.Symbol.Value;
if (RegexGrammar.CharacterRange == childInternalNodeSymbolValue)
{
characterRange = VisitCharacterRangeNode(childInternalNode);
}
else if (RegexGrammar.CharacterClass == childInternalNodeSymbolValue)
{
characterClass = VisitCharacterClassNode(childInternalNode);
}
}
if (characterClass != null)
{
return(new RegexCharacterClassAlteration(
characterRange,
characterClass));
}
return(new RegexCharacterClass(characterRange));
}
public virtual void Visit(IInternalTreeNode node)
{
var nodeChildrenCount = node.Children.Count;
for (var i = 0; i < nodeChildrenCount; i++)
{
node.Children[i].Accept(this);
}
}
public void Visit(IInternalTreeNode node)
{
this.writer.WriteLine($"{this.indent}{node}");
this.indent += " ";
foreach (var child in node.Children)
{
child.Accept(this);
}
this.indent = this.indent.Substring(0, this.indent.Length - 3);
}
private EbnfFactorOptional VisitOptionalNode(IInternalTreeNode node)
{
foreach (var internalNode in node.Children.OfType <IInternalTreeNode>())
{
if (internalNode.Is(EbnfGrammar.Expression))
{
return(new EbnfFactorOptional(VisitExpressionNode(internalNode)));
}
}
throw UnreachableCodeException();
}
private EbnfFactor VisitFactorNode(IInternalTreeNode node)
{
for (int c = 0; c < node.Children.Count; c++)
{
var child = node.Children[c];
switch (child.NodeType)
{
case TreeNodeType.Internal:
var internalNode = child as IInternalTreeNode;
var symbolValue = internalNode.Symbol.Value;
if (EbnfGrammar.QualifiedIdentifier == symbolValue)
{
return(new EbnfFactorIdentifier(
VisitQualifiedIdentifierNode(internalNode)));
}
if (EbnfGrammar.Literal == symbolValue)
{
return(new EbnfFactorLiteral(
VisitLiteralNode(internalNode)));
}
if (EbnfGrammar.Repetition == symbolValue)
{
return(VisitRepetitionNode(internalNode));
}
if (EbnfGrammar.Optional == symbolValue)
{
return(VisitOptionalNode(internalNode));
}
if (EbnfGrammar.Grouping == symbolValue)
{
return(VisitGroupingNode(internalNode));
}
if (RegexGrammar.Regex == symbolValue)
{
var regexVisitor = new RegexVisitor();
internalNode.Accept(regexVisitor);
return(new EbnfFactorRegex(regexVisitor.Regex));
}
break;
case TreeNodeType.Token:
break;
}
}
throw UnreachableCodeException();
}
private RegexSet VisitInnerSetNode(bool negate, IInternalTreeNode node)
{
foreach (var internalNode in node.Children.OfType <IInternalTreeNode>())
{
if (internalNode.Is(RegexGrammar.CharacterClass))
{
var characterClass = VisitCharacterClassNode(internalNode);
return(new RegexSet(characterClass, negate));
}
}
throw new Exception("Invalid Inner Set Detected");
}
private static RegexCharacterClassCharacter VisitCharacterClassCharacterNode(IInternalTreeNode internalNode)
{
for (var c = 0; c < internalNode.Children.Count; c++)
{
var child = internalNode.Children[c];
if (child.NodeType != TreeNodeType.Token)
continue;
var childTokenNode = child as ITokenTreeNode;
var value = childTokenNode.Token.Value.StartsWith(@"\")
? childTokenNode.Token.Value[1]
: childTokenNode.Token.Value[0];
return new RegexCharacterClassCharacter(value);
}
throw new Exception("Invalid Regex Character Class Character.");
}
private static string VisitLiteralNode(IInternalTreeNode node)
{
for (int c = 0; c < node.Children.Count; c++)
{
var child = node.Children[c];
switch (child.NodeType)
{
case TreeNodeType.Token:
var tokenNode = child as ITokenTreeNode;
// TODO: Find a better solution for identifing the lexer rule based on id
if (tokenNode.Token.TokenType.Id.Length > 5)
return tokenNode.Token.Value;
break;
case TreeNodeType.Internal:
break;
}
}
throw UnreachableCodeException();
}
private EbnfBlock VisitBlockNode(IInternalTreeNode node)
{
for (int c = 0; c < node.Children.Count; c++)
{
var child = node.Children[c];
switch (child.NodeType)
{
case TreeNodeType.Internal:
var internalNode = child as IInternalTreeNode;
var symbolValue = internalNode.Symbol.Value;
if (EbnfGrammar.Rule == symbolValue)
return VisitRuleNode(internalNode);
if (EbnfGrammar.Setting == symbolValue)
return VisitSettingNode(internalNode);
if (EbnfGrammar.LexerRule == symbolValue)
return VisitLexerRuleNode(internalNode);
break;
}
}
throw UnreachableCodeException();
}
private static EbnfLexerRuleFactor VisitLexerRuleFactorNode(IInternalTreeNode node)
{
for (int c = 0; c < node.Children.Count; c++)
{
var child = node.Children[c];
if (child.NodeType != TreeNodeType.Internal)
continue;
var internalNode = child as IInternalTreeNode;
var symbolValue = internalNode.Symbol.Value;
if (EbnfGrammar.Literal == symbolValue)
return new EbnfLexerRuleFactorLiteral(
VisitLiteralNode(internalNode));
if (RegexGrammar.Regex == symbolValue)
{
var regexVisitor = new RegexVisitor();
internalNode.Accept(regexVisitor);
return new EbnfLexerRuleFactorRegex(regexVisitor.Regex);
}
}
throw UnreachableCodeException();
}
private EbnfFactorRepetition VisitRepetitionNode(IInternalTreeNode node)
{
for (int c = 0; c < node.Children.Count; c++)
{
var child = node.Children[c];
switch (child.NodeType)
{
case TreeNodeType.Internal:
var internalNode = child as IInternalTreeNode;
var symbolValue = internalNode.Symbol.Value;
if (EbnfGrammar.Expression == symbolValue)
{
return new EbnfFactorRepetition(VisitExpressionNode(internalNode));
}
break;
}
}
throw UnreachableCodeException();
}
private RegexSet VisitInnerSetNode(bool negate, IInternalTreeNode internalNode)
{
for (var c = 0; c < internalNode.Children.Count; c++)
{
var child = internalNode.Children[c];
if (child.NodeType != TreeNodeType.Internal)
continue;
var childInternalNode = child as IInternalTreeNode;
var childInternalNodeSymbolValue = childInternalNode.Symbol.Value;
if (RegexGrammar.CharacterClass == childInternalNodeSymbolValue)
{
var characterClass = VisitCharacterClassNode(childInternalNode);
return new RegexSet(negate, characterClass);
}
}
throw new Exception("Invalid Inner Set Detected");
}
public virtual void Visit(IInternalTreeNode node)
{
foreach (var child in node.Children)
child.Accept(this);
}
private EbnfFactor VisitFactorNode(IInternalTreeNode node)
{
for (int c = 0; c < node.Children.Count; c++)
{
var child = node.Children[c];
switch (child.NodeType)
{
case TreeNodeType.Internal:
var internalNode = child as IInternalTreeNode;
var symbolValue = internalNode.Symbol.Value;
if (EbnfGrammar.QualifiedIdentifier == symbolValue)
return new EbnfFactorIdentifier(
VisitQualifiedIdentifierNode(internalNode));
if (EbnfGrammar.Literal == symbolValue)
return new EbnfFactorLiteral(
VisitLiteralNode(internalNode));
if (EbnfGrammar.Repetition == symbolValue)
return VisitRepetitionNode(internalNode);
if (EbnfGrammar.Optional == symbolValue)
return VisitOptionalNode(internalNode);
if (EbnfGrammar.Grouping == symbolValue)
return VisitGroupingNode(internalNode);
if (RegexGrammar.Regex == symbolValue)
{
var regexVisitor = new RegexVisitor();
internalNode.Accept(regexVisitor);
return new EbnfFactorRegex(regexVisitor.Regex);
}
break;
case TreeNodeType.Token:
break;
}
}
throw UnreachableCodeException();
}
private EbnfLexerRuleExpression VisitLexerRuleExpressionNode(IInternalTreeNode node)
{
EbnfLexerRuleTerm term = null;
EbnfLexerRuleExpression expression = null;
for (int c = 0; c < node.Children.Count; c++)
{
var child = node.Children[c];
if (child.NodeType != TreeNodeType.Internal)
continue;
var internalNode = child as IInternalTreeNode;
var symbolValue = internalNode.Symbol.Value;
if (EbnfGrammar.LexerRuleTerm == symbolValue)
term = VisitLexerRuleTermNode(internalNode);
if (EbnfGrammar.LexerRuleExpression == symbolValue)
expression = VisitLexerRuleExpressionNode(internalNode);
}
if (expression == null)
return new EbnfLexerRuleExpression(term);
return new EbnfLexerRuleExpressionAlteration(term, expression);
}
private RegexIterator VisitRegexIteratorNode(IInternalTreeNode internalNode)
{
for (var c = 0; c < internalNode.Children.Count; c++)
{
var child = internalNode.Children[c];
if (child.NodeType != TreeNodeType.Token)
continue;
var tokenChildNode = child as ITokenTreeNode;
switch (tokenChildNode.Token.Value)
{
case "*":
return RegexIterator.ZeroOrMany;
case "?":
return RegexIterator.ZeroOrOne;
case "+":
return RegexIterator.OneOrMany;
}
}
throw new Exception("Invalid iterator detected.");
}
private EbnfQualifiedIdentifier VisitQualifiedIdentifierNode(IInternalTreeNode node)
{
EbnfQualifiedIdentifier repetitionIdentifier = null;
string identifier = null;
for (int c = 0; c < node.Children.Count; c++)
{
var child = node.Children[c];
switch (child.NodeType)
{
case TreeNodeType.Internal:
var internalNode = child as IInternalTreeNode;
var symbolValue = internalNode.Symbol.Value;
if (EbnfGrammar.QualifiedIdentifier == symbolValue)
repetitionIdentifier = VisitQualifiedIdentifierNode(internalNode);
break;
case TreeNodeType.Token:
var tokenNode = child as ITokenTreeNode;
var token = tokenNode.Token;
if (token.TokenType.Id == "identifier")
identifier = token.Value;
break;
}
}
if (repetitionIdentifier == null)
return new EbnfQualifiedIdentifier(identifier);
return new EbnfQualifiedIdentifierConcatenation(identifier, repetitionIdentifier);
}
private RegexFactor VisitRegexFactorNode(IInternalTreeNode internalNode)
{
RegexAtom atom = null;
RegexIterator? iterator = null;
for (var c = 0; c < internalNode.Children.Count; c++)
{
var child = internalNode.Children[c];
if (child.NodeType != TreeNodeType.Internal)
continue;
var childInternalNode = child as IInternalTreeNode;
var childInternalNodeSymbolValue = childInternalNode.Symbol.Value;
if (RegexGrammar.Atom == childInternalNodeSymbolValue)
atom = VisitRegexAtomNode(childInternalNode);
else if(RegexGrammar.Iterator == childInternalNodeSymbolValue)
iterator = VisitRegexIteratorNode(childInternalNode);
}
if (iterator.HasValue)
return new RegexFactorIterator(
atom,
iterator.Value);
return new RegexFactor(atom);
}
public override void Visit(IInternalTreeNode node)
{
if (RegexGrammar.Regex == node.Symbol.Value)
Regex = VisitRegexNode(node);
}
private RegexExpression VisitRegexExpressionNode(IInternalTreeNode internalNode)
{
RegexExpression expression = null;
RegexTerm term = null;
for (var c = 0; c < internalNode.Children.Count; c++)
{
var child = internalNode.Children[c];
if (child.NodeType != TreeNodeType.Internal)
continue;
var childInternalNode = child as IInternalTreeNode;
var childInternalNodeSymbolValue = childInternalNode.Symbol.Value;
if (RegexGrammar.Expression == childInternalNodeSymbolValue)
expression = VisitRegexExpressionNode(childInternalNode);
else if (RegexGrammar.Term == childInternalNodeSymbolValue)
term = VisitRegexTermNode(childInternalNode);
}
if (expression != null && term != null)
return new RegexExpressionAlteration(term, expression);
if (term != null)
return new RegexExpressionTerm(term);
throw new InvalidOperationException("Unable to create null expression.");
}
private RegexAtom VisitRegexAtomNode(IInternalTreeNode internalNode)
{
for (var c = 0; c < internalNode.Children.Count; c++)
{
var child = internalNode.Children[c];
if (child.NodeType != TreeNodeType.Internal)
{
var childTokenNode = child as ITokenTreeNode;
switch (childTokenNode.Token.Value)
{
case ".":
return new RegexAtomAny();
default:
continue;
}
}
var childInternalNode = child as IInternalTreeNode;
var childInternalNodeSymbolValue = childInternalNode.Symbol.Value;
if (RegexGrammar.Character == childInternalNodeSymbolValue)
{
var character = VisitRegexCharacterNode(childInternalNode);
return new RegexAtomCharacter(character);
}
else if (RegexGrammar.Expression == childInternalNodeSymbolValue)
{
var expression = VisitRegexExpressionNode(childInternalNode);
return new RegexAtomExpression(expression);
}
else if(RegexGrammar.Set == childInternalNodeSymbolValue)
{
var set = VisitRegexSetNode(childInternalNode);
return new RegexAtomSet(set);
}
}
throw new Exception("Unable to parse atom. Invalid child production.");
}
private EbnfTerm VisitTermNode(IInternalTreeNode node)
{
EbnfFactor factor = null;
EbnfTerm term = null;
for (int c = 0; c < node.Children.Count; c++)
{
var child = node.Children[c];
switch (child.NodeType)
{
case TreeNodeType.Internal:
var internalNode = child as IInternalTreeNode;
var symbolValue = internalNode.Symbol.Value;
if (EbnfGrammar.Factor == symbolValue)
factor = VisitFactorNode(internalNode);
else if (EbnfGrammar.Term == symbolValue)
term = VisitTermNode(internalNode);
break;
case TreeNodeType.Token:
break;
}
}
if (term == null)
return new EbnfTerm(factor);
return new EbnfTermConcatenation(factor, term);
}
private EbnfLexerRuleTerm VisitLexerRuleTermNode(IInternalTreeNode node)
{
EbnfLexerRuleFactor factor = null;
EbnfLexerRuleTerm term = null;
for (int c = 0; c < node.Children.Count; c++)
{
var child = node.Children[c];
if (child.NodeType != TreeNodeType.Internal)
continue;
var internalNode = child as IInternalTreeNode;
var symbolValue = internalNode.Symbol.Value;
if (EbnfGrammar.LexerRuleFactor == symbolValue)
factor = VisitLexerRuleFactorNode(internalNode);
if (EbnfGrammar.LexerRuleTerm == symbolValue)
term = VisitLexerRuleTermNode(internalNode);
}
if (term == null)
return new EbnfLexerRuleTerm(factor);
return new EbnfLexerRuleTermConcatenation(factor, term);
}
private Regex VisitRegexNode(IInternalTreeNode node)
{
RegexExpression expression = null;
var startsWith = false;
var endsWith = false;
for (var c = 0; c< node.Children.Count; c++)
{
var child = node.Children[c];
switch (node.NodeType)
{
case TreeNodeType.Internal:
var internalNode = child as IInternalTreeNode;
var internalNodeSymbolValue = internalNode.Symbol.Value;
if(RegexGrammar.Expression == internalNodeSymbolValue)
expression = VisitRegexExpressionNode(internalNode);
break;
case TreeNodeType.Token:
var tokenNode = child as ITokenTreeNode;
switch (tokenNode.Token.Value)
{
case "$":
endsWith = true;
break;
case "^":
startsWith = true;
break;
}
break;
}
}
return new Regex(startsWith, expression, endsWith);
}
private EbnfBlockLexerRule VisitLexerRuleNode(IInternalTreeNode node)
{
EbnfQualifiedIdentifier qualifiedIdentifier = null;
EbnfLexerRuleExpression expression = null;
for (int c = 0; c < node.Children.Count; c++)
{
var child = node.Children[c];
if (child.NodeType != TreeNodeType.Internal)
continue;
var internalNode = child as IInternalTreeNode;
var symbolValue = internalNode.Symbol.Value;
if (EbnfGrammar.QualifiedIdentifier == symbolValue)
qualifiedIdentifier = VisitQualifiedIdentifierNode(internalNode);
else if (EbnfGrammar.LexerRuleExpression == symbolValue)
expression = VisitLexerRuleExpressionNode(internalNode);
}
return new EbnfBlockLexerRule(
new EbnfLexerRule(qualifiedIdentifier, expression));
}
private RegexSet VisitRegexSetNode(IInternalTreeNode internalNode)
{
for (var c = 0; c < internalNode.Children.Count; c++)
{
var child = internalNode.Children[c];
if (child.NodeType != TreeNodeType.Internal)
continue;
var childInternalNode = child as IInternalTreeNode;
var childInternalNodeSymbolValue = childInternalNode.Symbol.Value;
if(RegexGrammar.PositiveSet == childInternalNodeSymbolValue)
return VisitInnerSetNode(false, childInternalNode);
else if(RegexGrammar.NegativeSet == childInternalNodeSymbolValue)
return VisitInnerSetNode(true, childInternalNode);
}
throw new Exception("Invalid Set Detected.");
}
public override void Visit(IInternalTreeNode node)
{
if (EbnfGrammar.Definition == node.Symbol.Value)
Definition = VisitDefinitionNode(node);
}
private RegexTerm VisitRegexTermNode(IInternalTreeNode internalNode)
{
RegexFactor factor = null;
RegexTerm term = null;
for (var c = 0; c < internalNode.Children.Count; c++)
{
var child = internalNode.Children[c];
if (child.NodeType != TreeNodeType.Internal)
continue;
var childInternalNode = child as IInternalTreeNode;
var childInternalNodeSymbolValue = childInternalNode.Symbol.Value;
if (RegexGrammar.Factor == childInternalNodeSymbolValue)
factor = VisitRegexFactorNode(childInternalNode);
else if (RegexGrammar.Term == childInternalNodeSymbolValue)
term = VisitRegexTermNode(childInternalNode);
}
if (term == null)
return new RegexTerm(factor);
return new RegexTermFactor(factor, term);
}
private EbnfExpression VisitExpressionNode(IInternalTreeNode node)
{
EbnfTerm term = null;
EbnfExpression expression = null;
for (int c = 0; c < node.Children.Count; c++)
{
var child = node.Children[c];
switch (child.NodeType)
{
case TreeNodeType.Internal:
var internalNode = child as IInternalTreeNode;
var symbolValue = internalNode.Symbol.Value;
if (EbnfGrammar.Term == symbolValue)
term = VisitTermNode(internalNode);
else if (EbnfGrammar.Expression == symbolValue)
expression = VisitExpressionNode(internalNode);
break;
case TreeNodeType.Token:
break;
}
}
if (expression == null)
return new EbnfExpression(term);
return new EbnfExpressionAlteration(term, expression);
}
private EbnfBlockSetting VisitSettingNode(IInternalTreeNode node)
{
EbnfSettingIdentifier settingIdentifier = null;
EbnfQualifiedIdentifier qualifiedIdentifier = null;
for (int c = 0; c < node.Children.Count; c++)
{
var child = node.Children[c];
switch (child.NodeType)
{
case TreeNodeType.Token:
var tokenNode = child as ITokenTreeNode;
var token = tokenNode.Token;
if (token.TokenType.Id == nameof(settingIdentifier))
settingIdentifier = new EbnfSettingIdentifier(token.Value);
break;
case TreeNodeType.Internal:
var internalNode = child as IInternalTreeNode;
var symbolValue = internalNode.Symbol.Value;
if (EbnfGrammar.QualifiedIdentifier == symbolValue)
qualifiedIdentifier = VisitQualifiedIdentifierNode(internalNode);
break;
}
}
return new EbnfBlockSetting(
new EbnfSetting(settingIdentifier, qualifiedIdentifier));
}
private EbnfBlockRule VisitRuleNode(IInternalTreeNode node)
{
EbnfQualifiedIdentifier qualifiedIdentifier = null;
EbnfExpression expression = null;
for (int c = 0; c < node.Children.Count; c++)
{
var child = node.Children[c];
switch (child.NodeType)
{
case TreeNodeType.Internal:
var internalNode = child as IInternalTreeNode;
var symbolValue = internalNode.Symbol.Value;
if (EbnfGrammar.QualifiedIdentifier == symbolValue)
qualifiedIdentifier = VisitQualifiedIdentifierNode(internalNode);
else if (EbnfGrammar.Expression == symbolValue)
expression = VisitExpressionNode(internalNode);
break;
case TreeNodeType.Token:
break;
}
}
return new EbnfBlockRule(
new EbnfRule(qualifiedIdentifier, expression));
}
private EbnfDefinition VisitDefinitionNode(IInternalTreeNode node)
{
EbnfBlock block = null;
EbnfDefinition definition = null;
for (int c = 0; c< node.Children.Count; c++)
{
var child = node.Children[c];
switch (child.NodeType)
{
case TreeNodeType.Internal:
var internalNode = child as IInternalTreeNode;
var symbolValue = internalNode.Symbol.Value;
if (EbnfGrammar.Block == symbolValue)
block = VisitBlockNode(internalNode);
else if (EbnfGrammar.Definition == symbolValue)
definition = VisitDefinitionNode(internalNode);
break;
}
}
if (definition != null)
return new EbnfDefinitionConcatenation(block, definition);
return new EbnfDefinition(block);
}