public Transformation(string expression, string filter, string result)
{
ExpressionText = expression;
FilterText = filter;
ResultText = result;
TokenizedExpression = Tokenizer.Parse(ExpressionText);
TokenizedFilter = Tokenizer.Parse(FilterText);
TokenizedResult = Tokenizer.Parse(ResultText);
InstructionTree = InstructionParser.Parse(TokenizedExpression);
ResultInstructionTree = ResultParser.Parse(TokenizedResult);
Filters = FilterParser.ParseAll(TokenizedFilter);
LabelSet = new LabelSet(InstructionTree);
LabelSet.AddUse(ResultInstructionTree);
}
private static (InstructionNode node, int end, int nodeNbr) ParseInstructionNode(List <Token> tokens, int start, int nodeNbr)
{
var node = new InstructionNode()
{
NodeNbr = nodeNbr
};
var length = tokens.Count;
for (int index = start; index < length; index++)
{
var token = tokens[index];
if (token.TokenType == TokenType.OpenParens)
{
if (node.InstructionName == null)
{
index++;
node.InstructionName = tokens[index].Value;
}
else
{
var childNode = ParseInstructionNode(tokens, index, nodeNbr + 1);
index = childNode.end;
nodeNbr = childNode.nodeNbr;
node.Operands.Add(new Operand(childNode.node, node.Operands.Count));
}
}
else if (token.TokenType == TokenType.CloseParens)
{
return(node, index, nodeNbr);
}
else if (token.TokenType == TokenType.Word)
{
node.Operands.Add(new Operand(new Token(TokenType.Label, token.Position, token.Value), node.Operands.Count));
}
else if (token.TokenType == TokenType.IntegerConstant)
{
node.Operands.Add(new Operand(token, node.Operands.Count));
}
else if (token.TokenType == TokenType.DoubleConstant)
{
node.Operands.Add(new Operand(token, node.Operands.Count));
}
else if (token.TokenType == TokenType.FloatConstant)
{
node.Operands.Add(new Operand(token, node.Operands.Count));
}
else if (token.TokenType == TokenType.Underscore)
{
node.Operands.Add(new Operand(token, node.Operands.Count));
}
else if (token.TokenType == TokenType.OpenCurly)
{
index++; // skip to next token, which should be label
node.Conditions = InstructionParser.ParseConditions(tokens, ref index);
node.Condition = node.Conditions[0];
}
else
{
throw new Exception($"parsing error {token}");
}
}
throw new Exception($"parsing error incomplete");
}