private void checkUnaryMinus(LexemaSequence input, Lexema lexema)
{
if (lexema.symbol == Expression.MINUS)
{
bool must_change = false;
if (input.GetPosition() > 1)
{
char symbol = input.getLexema(input.GetPosition() - 2).symbol;
if ((symbol == Expression.ASSIGNMENT) ||
(symbol == Expression.OPEN_BRACE) ||
(symbol == Expression.PLUS) ||
(symbol == Expression.MULTUPLICATION) ||
(symbol == Expression.BITWISE_OR) ||
(symbol == Expression.DIVISION) ||
(symbol == Expression.MODUL) ||
(symbol == Expression.BITWISE_AND) ||
(symbol == Expression.BITWISE_INVERSION) ||
(symbol == Expression.BOOLEAN_INVERSION))
{
must_change = true;
}
}
else
{
must_change = true;
}
if (must_change)
{
lexema.symbol = Expression.UNARY_MINUS;
}
}
}
// парсваме в конструктора
public Parser(String file_name)
{
if (File.Exists(file_name))
{
StreamReader file = null;
try
{
String line = null;
int line_number = 0;
file = new StreamReader(file_name);
lexSeq = new LexemaSequence();
while ((line = file.ReadLine()) != null)
{
line_number++;
ParseString(line, line_number);
}
}
finally
{
if (file != null)
{
file.Close();
}
}
}
else
{
Console.WriteLine(file_name + " not found.");
}
}
private bool changeSymbol(LexemaSequence input, Lexema lexema, char search_symbol,
char replace_symbol)
{
if (lexema.symbol == search_symbol)
{
if (input.GetPosition() > 1)
{
if (input.getLexema(input.GetPosition() - 2).symbol == Expression.IDENTIFIER)
{
lexema.symbol = replace_symbol;
return(true);
}
}
if (input.GetPosition() < input.size())
{
if (input.peekLexema().symbol == Expression.IDENTIFIER)
{
//това е префиксна операция, не се прави заместване
return(true);
}
else
{
Console.WriteLine(search_symbol + " can be applyed only to identifier.");
return(false);
}
}
Console.WriteLine("Error 1002.");
return(false);
}
else
{
return(true);
}
}
static void Main(string[] args)
{
if (args.Length == 0)
{
Console.WriteLine("usage: Translator.exe <input file>");
return;
}
String inputFileName = args[0];
String productionsFileName = "productions.txt";
Parser parser = new Parser(inputFileName);
LexemaSequence input = parser.getSequence();
SyntaxAnalyser analyser = new SyntaxAnalyser(input, productionsFileName);
if (analyser.Process() == false)
{
Console.WriteLine("Input sequence syntax is incorrect.");
return;
}
//
TranslationUnit tr_unit = new TranslationUnit(input);
StreamWriter sw = new StreamWriter(new FileStream(inputFileName.Split(new char[] { '.' })[0] + ".asm", FileMode.OpenOrCreate, FileAccess.Write));
sw.Write(tr_unit.GetAsmCode());
sw.Close();
}
//открива и заменя постфиксни ++ и -- с други символи
private bool incAndDecSymbolDeal(LexemaSequence input, Lexema lexema)
{
bool ret = true;
ret = changeSymbol(input, lexema, Expression.PREFIX_INCREMENT, Expression.POSTFIX_INCREMENT);
if (ret == true)
{
ret = changeSymbol(input, lexema, Expression.PREFIX_DECREMENT, Expression.POSTFIX_DECREMENT);
}
return(ret);
}
private static Hashtable includedProcs = new Hashtable(); //<String, String>
public TranslationUnit(LexemaSequence input_seq)
{
input = input_seq;
loadExpressions();
asmHeader =
"STACK_SEG SEGMENT STACK" + newLine +
" DW 512 DUP(?)"+ newLine +
"STACK_SEG ENDS" + newLine +
newLine +
"CODESC SEGMENT 'CODE'" + newLine +
" ASSUME CS:CODESC, SS:STACK_SEG"+ newLine +
newLine +
"BEGIN: .386" + newLine;
returnDOS =
"MOV AH, 4CH" + newLine +
"INT 21H" + newLine;
asmFooter =
"CODESC ENDS" + newLine +
" END BEGIN" + newLine;
parseStatements();
}
public SyntaxAnalyser(LexemaSequence inputSequence, String filName)
{
input = inputSequence;
productionsFileName = filName;
}
