private Node Variable()
{
// VARIABLE_DEF VARIABLE ASSIGN
Token variable = Match(TokenType.VARIABLE);
VariableNode varNode = new VariableNode(variable.Position, variable.Text);
TokenType next = LookAhead(1);
if (next == TokenType.LBRACKET)
{
SourcePosition pos = Match(TokenType.LBRACKET).Position;
Node key = Expression();
Match(TokenType.RBRACKET);
return new LookupNode(pos, varNode, key);
}
else if (LookAhead(1) == TokenType.PERIOD)
{
Match(TokenType.PERIOD);
PropertyTreeNode propertyTree = new PropertyTreeNode(varNode.Position, varNode, Property());
if (LookAhead(1) == TokenType.END_STATEMENT)
{
Match(TokenType.END_STATEMENT);
}
return propertyTree;
}
else if (LookAhead(1) == TokenType.COLON)
{
PropertyNode property = new PropertyNode(variable.Position, variable.Text);
Match(TokenType.COLON);
Node value = Expression();
if (LookAhead(1) == TokenType.COMMA)
Match(TokenType.COMMA);
return new AssignNode(property.Position, property, value, true);
}
else
{
return varNode;
}
}
private Node Property()
{
if (LookAhead(2) == TokenType.LPAREN)
{
return FunctionCall();
}
else
{
Token varToken = Match(TokenType.VARIABLE);
if (LookAhead(1) == TokenType.PERIOD)
{
Match(TokenType.PERIOD);
Node propNode = new PropertyNode(varToken.Position, varToken.Text);
return new PropertyTreeNode(propNode.Position, propNode, Property());
}
else if (LookAhead(1) == TokenType.ASSIGN)
{
Match(TokenType.ASSIGN);
Node value = Expression();
PropertyNode propNode = new PropertyNode(varToken.Position, varToken.Text);
return new AssignNode(propNode.Position, propNode, value, true);
}
else
{
return new PropertyNode(varToken.Position, varToken.Text);
}
}
}
