/// <summary>
/// Constructor: creates a new compilation engine with the given input and output. The next routine called must be compileClass().
/// </summary>
/// <param name="inputFile"></param>
/// <param name="outputFile"></param>
public CompilationEngine(string inputFile, string outputFile)
{
//1. call Tokenizer
_xmlTokens = new StringBuilder();
_tokenizer = new JackTokenizer(inputFile);
//WriteXml("<tokens>"); //<tokens>
//first check for class element
_tokenizer.Advance();
if (_tokenizer.TokenType == Enums.Enumerations.TokenType.KEYWORD && _tokenizer.KeyWord() == "class")
{
CompileClass();
}
else
{
//error: no class struct
_tokenizer.RecordError("expecting class struct");
}
//WriteXml("</tokens>"); //</tokens>
string xml = _xmlTokens.ToString();
Xml = xml;
}
/// <summary>
/// Constructor: creates a new compilation engine with the given input and output. The next routine called must be compileClass().
/// </summary>
/// <param name="inputFile"></param>
/// <param name="outputFile"></param>
public CompilationEngine(string inputFile, string outputFile)
{
//1. call Tokenizer
_xmlTokens = new StringBuilder();
_tokenizer = new JackTokenizer(inputFile);
//WriteXml("<tokens>"); //<tokens>
//first check for class element
_tokenizer.Advance();
if (_tokenizer.TokenType == Enums.Enumerations.TokenType.KEYWORD && _tokenizer.KeyWord() == "class")
{
CompileClass();
}
else
{
//error: no class struct
_tokenizer.RecordError("expecting class struct");
}
//WriteXml("</tokens>"); //</tokens>
string xml = _xmlTokens.ToString();
Xml = xml;
}
/// <summary>
/// Compiles a complete class.
/// We'll use the jack programming grammar found on page 208/209 to check for compilation errors etc.
/// </summary>
public void CompileClass()
{
WriteXml("<class>"); //<class>
WriteCurrentToken();
//according to the grammar we should next have a className identifier
_tokenizer.Advance();
if (_tokenizer.TokenType == Enums.Enumerations.TokenType.IDENTIFIER)
{
WriteCurrentToken();
_tokenizer.Advance();
if (_tokenizer.TokenType == Enums.Enumerations.TokenType.SYMBOL)
{
WriteCurrentToken();
_tokenizer.Advance();
//now we determine if we have class variable declarations or subroutine declaration
//looping through the variable declarations first, if there are any.
while (_tokenizer.TokenType == Enums.Enumerations.TokenType.KEYWORD && decTypes.Contains(_tokenizer.KeyWord()) && !_tokenizer.HasErrors)
{
CompileClassVarDec();
}
//looping through the subroutine declarations, if there are any.
while (_tokenizer.TokenType == Enums.Enumerations.TokenType.KEYWORD && subTypes.Contains(_tokenizer.KeyWord()) && !_tokenizer.HasErrors)
{
CompileSubroutine();
}
}
else
{
//error: expecting '{'
_tokenizer.RecordError("expecting '{'");
}
}
else
{
//error: expecting className
_tokenizer.RecordError("expecting className");
}
if (_tokenizer.TokenType == Enums.Enumerations.TokenType.SYMBOL && _tokenizer.Symbol() == "}")
{
WriteCurrentToken();
}
else
{
_tokenizer.RecordError("expecting '}' end of class");
}
WriteXml("</class>"); //</class>
}