/// <summary>
/// Always jumps to a identifier node where name and type is processed.
/// </summary>
public void Visit(MatchVariableNode node)
{
readingName = true;
// It is not an anonnymous field.
if (node.variableName != null)
{
node.variableName.Accept(this);
}
// It has set type.
if (node.variableType != null)
{
readingName = false;
node.variableType.Accept(this);
}
}
/// <summary>
/// Parses variable enclosed in vertex or edge.
/// Expects Name:Type / Name / :Type / (nothing)
/// </summary>
/// <returns> A variable node. </returns>
static private Node ParseMatchVariable(ref int position, List <Token> tokens)
{
MatchVariableNode matchVariableNode = new MatchVariableNode();
// Expecting identifier, name of variable. Can be empty, if so then it is anonymous variable.
Node name = ParseIdentifierExrp(ref position, tokens);
if (name != null)
{
position++;
}
matchVariableNode.AddVariableName(name);
// Check for type of vairiable after :
if (CheckToken(position, Token.TokenType.DoubleDot, tokens))
{
position++;
Node identifierNode = ParseIdentifierExrp(ref position, tokens);
if (identifierNode == null)
{
ThrowError("Match parser", "Expected IDENTIFIER after double dot.", position, tokens);
}
else
{
matchVariableNode.AddVariableType(identifierNode);
}
position++;
}
if (matchVariableNode.IsEmpty())
{
return(null);
}
else
{
return(matchVariableNode);
}
}
public void Visit(MatchVariableNode node)
{
throw new NotImplementedException();
}