public override ICodeNode Parse(Token token)
{
token = NextToken(); // after method
ICodeNode methodNode = IntermediateCodeFactory.CreateICodeNode("method");
StatementParser statementParser = new StatementParser(this);
statementParser.ParseList(token, ref methodNode, "end", "missing_end");
token = CurrentToken();
return methodNode;
}
public void OnMessage(Token token)
{
Parser.OnMessage(this, MessageType.Token, new Dictionary<string, object>()
{
{"LineNumber", token.LineNumber},
{"Position", token.Position},
{"TokenType", token.TokenType},
{"TokenText", token.Text},
{"TokenValue", token.Value}
});
}
public void Flag(Token token, ILangErrorCode errorCode, Parser parser)
{
Parser.OnMessage(parser, MessageType.SyntaxError, new Dictionary<string, object>()
{
{"LineNumber", token.LineNumber},
{"Position", token.Position},
{"TokenText", token.Text},
{"Error", errorCode}
});
if (++errors > MAX_ERROR)
Fatal("too_many_errors", parser);
}
public override ICodeNode Parse(Token token)
{
ICodeNode node = null;
switch (token.TokenType.ToString())
{
case "method":
MethodParser methodParser = new MethodParser(this);
node = methodParser.Parse(token);
// CurrentToken() == ";"
break;
case "identifier":
AssignmentParser assignmentParser = new AssignmentParser(this);
node = assignmentParser.Parse(token);
break;
default:
node = IntermediateCodeFactory.CreateICodeNode("no_op");
break;
}
if (node != null)
node.SetAttribute("line", token.LineNumber);
return node;
}
public void ParseList(Token token, ref ICodeNode parent, ILangTokenType terminator, ILangErrorCode error)
{
// As long as we are parseing neither endToken or terminating token
// do this
while (!(token is EndOfFileToken) && (token.TokenType.ToString() != terminator.ToString()))
{
ICodeNode statementNode = Parse(token);
parent.AddChild(statementNode);
// token have been moved; get the latest
token = CurrentToken();
if (token.TokenType == "semicolon")
{
token = NextToken(); // move beyond the statement separator.
}
else if (token.TokenType == "identifier")
{
ErrorHandler.Singleton.Flag(token, "missing_semicolon", this);
}
else if (token.TokenType != terminator)
{
ErrorHandler.Singleton.Flag(token, "unexpected_token", this);
token = NextToken();
}
}
if (token.TokenType == terminator)
{
token = NextToken();
}
else
{
ErrorHandler.Singleton.Flag(token, error, this);
}
}
public virtual ICodeNode Parse(Token token)
{
return null;
}
public virtual Token NextToken()
{
_current = ExtractToken();
return _current;
}