public static bool ExpectType(this JackTokenizer.ClassifiedJackToken token, bool acceptVoid = false, bool throwException = true)
{
if (token.TokenType() == JackTokenizer.JackTokenType.identifier)
{
return(true);
}
else if (
token.TokenType() == JackTokenizer.JackTokenType.keyword &&
(
token.ParseKeyWord() == JackTokenizer.JackKeywordTypes.INT ||
token.ParseKeyWord() == JackTokenizer.JackKeywordTypes.CHAR ||
token.ParseKeyWord() == JackTokenizer.JackKeywordTypes.BOOLEAN ||
(acceptVoid ? token.ParseKeyWord() == JackTokenizer.JackKeywordTypes.VOID : false)
)
)
{
return(true);
}
else
{
if (throwException)
{
throw new Exception("Expected a type keyword but found '" + token.value + "'.");
}
else
{
return(false);
}
}
}
public static string ExpectIdentifier(this JackTokenizer.ClassifiedJackToken token)
{
if (token.TokenType() == JackTokenizer.JackTokenType.identifier)
{
return(token.Identifier());
}
else
{
throw new Exception("Expected identifier but found '" + token.value + "'.");
}
}
public static string getIdentifierCategory(this JackTokenizer.ClassifiedJackToken token, SymbolTable symbolTable = null)
{
if (token.TokenType() == JackTokenizer.JackTokenType.identifier && symbolTable != null)
{
var category = symbolTable.KindOf(token.Identifier());
if (category != null)
{
return(" category=\"" + category.ToString().ToLower() + "\"");
}
}
return("");
}
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);
}
}
}
public static bool ExpectKeyword(this JackTokenizer.ClassifiedJackToken token, JackTokenizer.JackKeywordTypes[] keywords, bool throwException = true)
{
if (token.TokenType() == JackTokenizer.JackTokenType.keyword &&
keywords.Contains(token.ParseKeyWord()))
{
return(true);
}
else
{
if (throwException)
{
throw new Exception("Expected one of these keywords '" + keywords.Select(x => x.ToString()).ToString() + "' but found '" + token.value + "'.");
}
else
{
return(false);
}
}
}
public static bool ExpectKeyword(this JackTokenizer.ClassifiedJackToken token, JackTokenizer.JackKeywordTypes keyword, bool throwException = true)
{
if (token.TokenType() == JackTokenizer.JackTokenType.keyword &&
token.ParseKeyWord() == keyword)
{
return(true);
}
else
{
if (throwException)
{
throw new Exception("Expected keyword 'class' but found '" + token.value + "'.");
}
else
{
return(false);
}
}
}
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);
}