private void CompileOp(JackTokenizer.ClassifiedJackToken token)
{
var sym = token.ParseChar();
switch (sym)
{
case '+':
this.vm.WriteArithmetic(VMWriter.Command.ADD);
break;
case '-':
this.vm.WriteArithmetic(VMWriter.Command.SUB);
break;
case '*':
this.vm.WriteCall("Math.multiply", 2);
break;
case '/':
this.vm.WriteCall("Math.divide", 2);
break;
case '>':
this.vm.WriteArithmetic(VMWriter.Command.GT);
break;
case '<':
this.vm.WriteArithmetic(VMWriter.Command.LT);
break;
case '=':
this.vm.WriteArithmetic(VMWriter.Command.EQ);
break;
case '&':
this.vm.WriteArithmetic(VMWriter.Command.AND);
break;
case '|':
this.vm.WriteArithmetic(VMWriter.Command.OR);
break;
}
}
public static bool ExpectSymbol(this JackTokenizer.ClassifiedJackToken token, char symbol, bool throwException = true)
{
if (token.TokenType() == JackTokenizer.JackTokenType.symbol &&
token.ParseChar() == symbol
)
{
return(true);
}
else
{
if (throwException)
{
throw new Exception("Expected symbol'" + symbol + "' but found '" + token.value + "'.");
}
else
{
return(false);
}
}
}
public static string toXml(this JackTokenizer.ClassifiedJackToken token, SymbolTable symbolTable = null)
{
string xml = "";
JackTokenizer.JackTokenType tokenClass = token.TokenType();
xml += $"<{tokenClass.ToString()}{token.getIdentifierCategory(symbolTable)}>";
switch (tokenClass)
{
case JackTokenizer.JackTokenType.identifier:
case JackTokenizer.JackTokenType.intConst:
case JackTokenizer.JackTokenType.keyword:
xml += token.value;
break;
case JackTokenizer.JackTokenType.stringConst:
xml += token.ParseStringVal();
break;
case JackTokenizer.JackTokenType.symbol:
char sym = token.ParseChar();
if (sym == '<')
{
xml += "<";
}
else if (sym == '>')
{
xml += ">";
}
else if (sym == '&')
{
xml += "&";
}
else
{
xml += token.value;
}
break;
}
xml += "</" + tokenClass.ToString() + ">\n";
return(xml);
}
public static bool ExpectSymbol(this JackTokenizer.ClassifiedJackToken token, char[] symbols, bool throwException = true)
{
if (token.TokenType() == JackTokenizer.JackTokenType.symbol && symbols.Contains(token.ParseChar()))
{
return(true);
}
else
{
if (throwException)
{
throw new Exception("Expected on of theses symbols '" + symbols.ToString() + "' but found '" + token.value + "'.");
}
else
{
return(false);
}
}
}
