/// <summary>
/// Go to next Token without checking the type
/// </summary>
public void Next()
{
if (Program != null)
{
// If Fininshed don't search
if (Finished())
return;
CurrentToken = Program[ProgramPosition];
ProgramPosition++;
return;
}
}
/// <summary>
/// Reset Paser to inital state
/// </summary>
public void Reset()
{
this.CurrentToken = new Token(this, "");
this.ProgramPosition = 0;
Next();
}
/// <summary>
/// Instantiate a new BASIC Parser
/// </summary>
/// <param name="Program">Program to parse</param>
/// <param name="CustomTokens">Custom Tokens</param>
public CodeParser(String SourceCode, KeywordTokenConstructor[] CustomTokens)
{
// Found variable names
VariableNames = new ArrayList();
// Keyword tokens to search for
KeywordTokens = new ArrayList();
// Let, Print
KeywordTokens.Add(new KeywordTokenConstructor("let", delegate(CodeParser Parser, String Contents) { return new LetToken(Parser, Contents); } ));
KeywordTokens.Add(new KeywordTokenConstructor("print", delegate(CodeParser Parser, String Contents) { return new PrintToken(Parser, Contents); }));
// If-Then-Else
KeywordTokens.Add(new KeywordTokenConstructor("if", delegate(CodeParser Parser, String Contents) { return new IfToken(Parser, Contents); }));
KeywordTokens.Add(new KeywordTokenConstructor("then", delegate(CodeParser Parser, String Contents) { return new ThenToken(Parser, Contents); }));
KeywordTokens.Add(new KeywordTokenConstructor("else", delegate(CodeParser Parser, String Contents) { return new ElseToken(Parser, Contents); }));
KeywordTokens.Add(new KeywordTokenConstructor("endif", delegate(CodeParser Parser, String Contents) { return new EndIfToken(Parser, Contents); }));
// While-Wend
KeywordTokens.Add(new KeywordTokenConstructor("while", delegate(CodeParser Parser, String Contents) { return new WhileToken(Parser, Contents); }));
KeywordTokens.Add(new KeywordTokenConstructor("wend", delegate(CodeParser Parser, String Contents) { return new WendToken(Parser, Contents); }));
// For-Next
KeywordTokens.Add(new KeywordTokenConstructor("for", delegate(CodeParser Parser, String Contents) { return new ForToken(Parser, Contents); }));
KeywordTokens.Add(new KeywordTokenConstructor("to", delegate(CodeParser Parser, String Contents) { return new ToToken(Parser, Contents); }));
KeywordTokens.Add(new KeywordTokenConstructor("step", delegate(CodeParser Parser, String Contents) { return new StepToken(Parser, Contents); }));
KeywordTokens.Add(new KeywordTokenConstructor("next", delegate(CodeParser Parser, String Contents) { return new NextToken(Parser, Contents); }));
// Goto, Gosub, Return
KeywordTokens.Add(new KeywordTokenConstructor("goto", delegate(CodeParser Parser, String Contents) { return new GotoToken(Parser, Contents); }));
KeywordTokens.Add(new KeywordTokenConstructor("gosub", delegate(CodeParser Parser, String Contents) { return new GosubToken(Parser, Contents); }));
KeywordTokens.Add(new KeywordTokenConstructor("return", delegate(CodeParser Parser, String Contents) { return new ReturnToken(Parser, Contents); }));
// End, Rem
KeywordTokens.Add(new KeywordTokenConstructor("end", delegate(CodeParser Parser, String Contents) { return new EndToken(Parser, Contents); }));
KeywordTokens.Add(new KeywordTokenConstructor("rem", delegate(CodeParser Parser, String Contents) { return new RemToken(Parser, Contents); }));
// Sleep
//KeywordTokens.Add(new KeywordTokenConstructor("sleep", delegate(CodeParser Parser, String Contents) { return new SleepToken(Parser, Contents); }));
// Numeric functions
KeywordTokens.Add(new KeywordTokenConstructor("int", delegate(CodeParser Parser, String Contents) { return new IntToken(Parser, Contents); }));
KeywordTokens.Add(new KeywordTokenConstructor("cint", delegate(CodeParser Parser, String Contents) { return new CIntToken(Parser, Contents); }));
KeywordTokens.Add(new KeywordTokenConstructor("rnd", delegate(CodeParser Parser, String Contents) { return new RndToken(Parser, Contents); }));
KeywordTokens.Add(new KeywordTokenConstructor("randomize", delegate(CodeParser Parser, String Contents) { return new RandomizeToken(Parser, Contents); }));
KeywordTokens.Add(new KeywordTokenConstructor("timer", delegate(CodeParser Parser, String Contents) { return new TimerToken(Parser, Contents); }));
KeywordTokens.Add(new KeywordTokenConstructor("now", delegate(CodeParser Parser, String Contents) { return new NowToken(Parser, Contents); }));
KeywordTokens.Add(new KeywordTokenConstructor("strpos", delegate(CodeParser Parser, String Contents) { return new StrPosToken(Parser, Contents); }));
// String Functions
KeywordTokens.Add(new KeywordTokenConstructor("chr$", delegate(CodeParser Parser, String Contents) { return new Chr__Token(Parser, Contents); }));
KeywordTokens.Add(new KeywordTokenConstructor("toupper$", delegate(CodeParser Parser, String Contents) { return new ToUpper__Token(Parser, Contents); }));
KeywordTokens.Add(new KeywordTokenConstructor("tolower$", delegate(CodeParser Parser, String Contents) { return new ToLower__Token(Parser, Contents); }));
// IO Functions
// Add custom tokens to token array
if (CustomTokens != null)
{
foreach (KeywordTokenConstructor T in CustomTokens)
{
KeywordTokens.Add(T);
}
}
// Store Program
this.SourceCode = SourceCode;
this.SourceCodeLower = SourceCode.ToLower();
// Tokenize the current program, increases speed
ArrayList GetTokenizedProgram = new ArrayList();
// Keep parsing until end of program
while (true)
{
// Increase sourcecode position
SourceCodePosition = SourceCodeNextPosition;
// Check if we've reached the end of the program
if (((SourceCodePosition >= SourceCode.Length) || (SourceCode[SourceCodePosition] == (char)0) || (typeof(EndOfInputToken).Equals(CurrentToken.GetType()))))
break;
// Skip Whitespace
while (((SourceCode[SourceCodePosition] == ' ') || (SourceCode[SourceCodePosition] == '\t')))
{
SourceCodePosition++;
// Stop at the end of the program
if (SourceCodePosition == SourceCode.Length)
{
CurrentToken = new EndOfInputToken(this, "");
GetTokenizedProgram.Add(CurrentToken);
break;
}
}
// Fetch and Store Token
CurrentToken = FindNextToken(ref GetTokenizedProgram);
GetTokenizedProgram.Add(CurrentToken);
}
// Store Tokenized Program
GetTokenizedProgram.Add(new EndOfInputToken(this,""));
Program = (Token[]) GetTokenizedProgram.ToArray(typeof(Token));
Reset();
}
