TokenTable.Token ExpectedToken(uint tokenCode)
{
CheckUnexpectedEnd();
if (GetTokenCode() != tokenCode)
{
throw new Exception($"Expected \"{TokenTable.GetLexemeName(tokenCode)}\" but found \"{TokenTable.GetLexemeName(GetTokenCode())}\" in line {tokenListNode.Value.Line}.");
}
var token = tokenListNode.Value;
TransitToNextToken();
return(token);
}
TokenTable.Token ExpectedOneOfTokens(string expected, params uint[] tokenCodes)
{
CheckUnexpectedEnd();
if (tokenCodes.All(tokenCode => GetTokenCode() != tokenCode))
{
throw new Exception($"Expected {expected} but found \"{TokenTable.GetLexemeName(GetTokenCode())}\" in line {tokenListNode.Value.Line}.");
}
var token = tokenListNode.Value;
TransitToNextToken();
return(token);
}
private CustomTree DeclarationStatement()
{
CustomTree node = new CustomTree("declaration");
//"int" | "float"
var token = ExpectedOneOfTokens("TypeSpecifier", (uint)TokenTable.Code.Int, 100);
node.AddChild(new CustomTree(TokenTable.GetLexemeName(token.Code)));
// identifier
token = ExpectedToken((uint)TokenTable.Code.Id);
node.AddChild(new CustomTree("identifier", token.ForeignId));
ExpectedToken((uint)TokenTable.Code.Semicolon); // ';'
return(node);
}
TokenTable.Token ExpectLogicalOp()
{
CheckUnexpectedEnd();
if (!TokenTable.LogicOpCodes.Contains(GetTokenCode()))
{
throw new Exception($"Expected \"{String.Join(", ", TokenTable.LogicOpCodes)}\" but found \"{TokenTable.GetLexemeName(GetTokenCode())}\" in line {tokenListNode.Value.Line}.");
}
var token = tokenListNode.Value;
TransitToNextToken();
return(token);
}