public virtual BlockBase StartAlternate(int lineNumber)
{
if (Tokens.Last() is ConditionalBlock child)
{
child.returnBlockId = this is ConditionalBlock ? returnBlockId : BlockId;
BlockBase result = child.RequiresAlternate();
if (result != null)
{
result.returnBlockId = this is ConditionalBlock ? returnBlockId : BlockId;
result = result.StartAlternate(lineNumber);
(result as ConditionalBlock).AcceptAlternate();
return(result);
}
return(this);
}
return(this as ConditionalBlock);
}
public IEnumerator <Script> GetEnumerator()
{
bool inScript = false;
ScriptParserState parserState = ScriptParserState.None;
BlockBase currentBlock = null;
foreach (Token token in tokenizer)
{
if (inScript)
{
switch (token.Type)
{
case TokenType.StatementEnd:
currentBlock = currentBlock.CompleteBlock() ?? throw new InvalidDataException($"Malformed Script detected");
parserState = ScriptParserState.None;
continue;
case TokenType.LineEnd:
if (parserState == ScriptParserState.ScriptName)
{
parserState = ScriptParserState.None;
}
continue;
case TokenType.BlockOpen:
currentBlock = currentBlock.StartBlock(tokenizer.LineNumber);
continue;
case TokenType.BracketOpen:
currentBlock = currentBlock.StartEnclosure(tokenizer.LineNumber);
continue;
case TokenType.BlockClose:
case TokenType.BracketClose:
if ((token.Type == TokenType.BracketClose && currentBlock is Enclosure) ||
(token.Type == TokenType.BlockClose && currentBlock is Block))
{
currentBlock = currentBlock.CompleteBlock() ?? throw new InvalidDataException($"Malformed Script detected");;
continue;
}
else //something wrong here
{
throw new InvalidDataException($"Error in signal script data, matching element not found in line {tokenizer.LineNumber}.");
}
case TokenType.Value:
if (parserState == ScriptParserState.ScriptName) //script names may include any value token or operator, only ended by line end
{
(currentBlock as Script).ScriptName += token.Value;
continue;
}
switch (token.Value)
{
case "REM":
yield return(currentBlock as Script);
inScript = false;
parserState = ScriptParserState.Remark;
continue;
case "SCRIPT":
if (!(currentBlock is Script))
{
throw new InvalidDataException($"Error in signal script, matching element not found before new script in line {tokenizer.LineNumber}.");
}
yield return(currentBlock as Script);
if (parserState == ScriptParserState.Remark)
{
parserState = ScriptParserState.None;
}
else
{
currentBlock = new Script(tokenizer.LineNumber);
parserState = ScriptParserState.ScriptName;
inScript = true;
}
continue;
case "IF":
currentBlock = currentBlock.StartCondition(tokenizer.LineNumber);
continue;
case "ELSE":
currentBlock = currentBlock.StartAlternate(tokenizer.LineNumber);
continue;
case "AND":
case "OR":
case "NOT":
case "MOD":
case "DIV":
currentBlock = currentBlock.Add(new OperatorToken(token.Value, tokenizer.LineNumber), tokenizer.LineNumber);
continue;
default:
currentBlock = currentBlock.Add(new ScriptToken()
{
Token = token.Value
}, tokenizer.LineNumber);
continue;
}
case TokenType.Separator:
case TokenType.Tab:
case TokenType.Comma:
continue;
case TokenType.Operator:
if (parserState == ScriptParserState.ScriptName)
{
(currentBlock as Script).ScriptName += token.Value;
}
else
{
if (token.Value != "#") //ignoring single # operator (rounding) which isn't used in OR
{
currentBlock = currentBlock.Add(new OperatorToken(token.Value, tokenizer.LineNumber), tokenizer.LineNumber);
}
}
continue;
default:
throw new InvalidOperationException($"Unknown token type {token.Type} containing '{token.Value}' in line {tokenizer.LineNumber}");
}
}
else if (token.Type == TokenType.Value)
{
switch (token.Value)
{
case "REM":
parserState = ScriptParserState.Remark;
continue;
case "SCRIPT":
if (parserState == ScriptParserState.Remark)
{
parserState = ScriptParserState.None;
}
else // start new script
{
currentBlock = new Script(tokenizer.LineNumber);
parserState = ScriptParserState.ScriptName;
inScript = true;
}
continue;
}
}
}
yield return(currentBlock as Script);
}
public ConditionalBlock(BlockBase parent, int lineNumber) : base(parent, lineNumber)
{
}
public Enclosure(BlockBase parent, int lineNumber) : base(parent, lineNumber)
{
}
public Block(BlockBase parent, int lineNumber) : base(parent, lineNumber)
{
}
public Statement(BlockBase parent, int lineNumber) : base(parent, lineNumber)
{
}
protected void AddNestedBlock(BlockBase block)
{
Current = block;
Tokens.Add(block);
}
public BlockBase(BlockBase parent, int lineNumber)
{
Parent = parent;
Parent?.AddNestedBlock(this);
LineNumber = lineNumber;
}