public static IInstruction BuildInstruction(List<Token> tokens, ref int index)
{
// if we're just starting, encase the root-level instructions with a section statement
if (index == 0)
{
tokens.Insert(0, new Token(InstructionList.Keyword, TokenType.Word, 0));
tokens.Add(new Token("end", TokenType.Word, 0));
index++;
InstructionList il = new InstructionList();
il.Build(tokens, ref index);
return il;
}
Token token = tokens[index];
// special case: if a standalone literal is found, create a "show" instruction to process it
if (token.TokenType == TokenType.StringLiteral)
{
ShowInstruction si = new ShowInstruction();
si.Build(tokens, ref index, true);
return si;
}
// find the relevant creator/processor for the instruction
if (token.TokenType == TokenType.Word)
{
if (instructionCreators.ContainsKey(token.Value))
{
IInstruction instruction = instructionCreators[token.Value].Create();
index++;
instruction.Build(tokens, ref index);
return instruction;
}
}
throw new TokenParserException("I have no idea what \"" + token.Value + "\" means or at least what I'm supposed to do with it here.", token);
}