public Parser(string fileName)
{
this.code = new Code();
this.fileName = fileName;
this.lines = new List <string>();
this.symbolTable = new SymbolTable();
foreach (var line in System.IO.File.ReadAllLines(fileName))
{
Regex.Replace(line, @"\s+", "");
var trimmedLine = line.Trim();
int index = line.IndexOf("/");
if (String.IsNullOrEmpty(trimmedLine) || trimmedLine[0] == '/')
{
continue;
}
trimmedLine = index != -1 ? trimmedLine.Split('/')[0] : trimmedLine;
if (line[0] == '(')
{
var key = line.Substring(1, line.Length - 2);
symbolTable.AddEntry(key, lines.Count);
System.Console.WriteLine("continue is called" + key);
continue;
}
lines.Add(trimmedLine);
}
this.currentLine = 0;
this.n = 16;
foreach (var line in lines)
{
var currentSymbol = line.Substring(1, line.Length - 1);
System.Console.WriteLine(currentSymbol);
if (line[0] == '@' && !symbolTable.Contains(currentSymbol) && !int.TryParse(currentSymbol, out _))
{
symbolTable.AddEntry(currentSymbol, n++);
}
}
}
// parses one function definition
void matchFunction()
{
match(Token.KwdFunc);
currFunction = new CompiledFunction(sc.TokenText);
// Get the function text
string fnName = sc.TokenText;
match(Token.Ident); // the function name
// check for uniqueness, then add to the function list if unique.
checkUniqueFunction(fnName);
FunctionList.Add(fnName);
currSymbolTable = new SymbolTable();
match(Token.LPar);
if (nextToken != Token.RPar) {
for( ; ; ) {
string argname = sc.TokenText;
match(Token.Ident);
if (!currSymbolTable.AddEntry(argname, currFunction.AddArgument(argname)))
SemanticError("duplicate declaration of argument {0}", argname);
if (nextToken != Token.Comma)
break;
advance();
}
}
match(Token.RPar);
matchBlock();
// the function should end with a return statement. In case ...
currFunction.AddInstruction(OpCode.Stop);
program.Add(currFunction);
currFunction = null;
currSymbolTable = null;
}
// parses one function definition
void matchFunction()
{
match(Token.KwdFunc);
currFunction = new CompiledFunction(sc.TokenText);
// Add next token to list
string fn = sc.TokenText;
int args = 0;
Function func = new Function(fn, 0);
if (!functionNames.Contains(fn))
functionNames.Add(fn);
else
throw new ParseError("Duplicate function name " + func.name);
match(Token.Ident); // the function name
currSymbolTable = new SymbolTable();
match(Token.LPar);
if (nextToken != Token.RPar) {
for( ; ; ) {
string argname = sc.TokenText;
args++;
match(Token.Ident);
if (!currSymbolTable.AddEntry(argname, currFunction.AddArgument(argname)))
SemanticError("duplicate declaration of argument {0}", argname);
if (nextToken != Token.Comma)
break;
advance();
}
}
func.args = args;
functions.Add(func);
match(Token.RPar);
matchBlock();
// the function should end with a return statement. In case ...
currFunction.AddInstruction(OpCode.Stop);
program.Add(currFunction);
currFunction = null;
currSymbolTable = null;
}
