/// <summary>Skip lex and get value to _lex</summary>
/// <param name="ch">Current character.</param>
public static void NextLex(char ch)
{
//ch = Text.Ch().
if (ch == Text.ChSPACE || ch == Text.ChTAB || ch == Text.ChEOL)
{
Text.NextCh();
while (Text.Ch() == Text.ChSPACE || Text.Ch() == Text.ChTAB || Text.Ch() == Text.ChEOL)
{
Text.NextCh();
}
ch = Text.Ch();
}
if (Char.IsLetter(ch) || ch == '\u005f' || ch == '\u0024')
{
ScanIdent(ch);
}
else if (ch == '/')
{
Text.NextCh();
ch = Text.Ch();
if (ch == '*' || ch == '/')
{
Comment();
NextLex(Text.Ch());
}
else if (ch == '=')
{
_lex = Lex.ASSDIV; // /=.
Text.NextCh();
}
else
{
_lex = Lex.DIV; // /.
}
}
else if (ch == '(')
{
_lex = Lex.LPAR;
Text.NextCh();
}
else if (ch == ')')
{
_lex = Lex.RPAR;
Text.NextCh();
}
else if (ch == '{')
{
_lex = Lex.LBRACE;
Text.NextCh();
}
else if (ch == '}')
{
_lex = Lex.RBRACE;
Text.NextCh();
}
else if (ch == '[')
{
_lex = Lex.LSQUAREPAR;
Text.NextCh();
}
else if (ch == ']')
{
_lex = Lex.RSQUAREPAR;
Text.NextCh();
}
else if (ch == '.')
{
_lex = NumberAnalysis.FractionalPart(true);
}
else if (ch == ',')
{
_lex = Lex.COMMA;
Text.NextCh();
}
else if (ch == ';')
{
_lex = Lex.SEMI;
Text.NextCh();
}
else if (ch == '=')
{
Text.NextCh();
if (Text.Ch() == '=')
{
_lex = Lex.EQ;
Text.NextCh();
}
else
{
_lex = Lex.ASS;
}
}
else if (ch == '>')
{
Text.NextCh();
if (Text.Ch() == '=')
{
_lex = Lex.GE;
Text.NextCh();
}
else if (Text.Ch() == '>')
{
Text.NextCh();
if (Text.Ch() == '=')
{
_lex = Lex.ASSRSHIFT; // >>=
Text.NextCh();
}
else if (Text.Ch() == '>')
{
Text.NextCh();
if (Text.Ch() == '=')
{
_lex = Lex.ASSZEROSHIFT; // >>>= .
Text.NextCh();
}
else
{
_lex = Lex.ZEROSHIFT; // >>>.
}
}
else
{
_lex = Lex.RSHIFT; // >>.
}
}
else
{
_lex = Lex.GT; // >=.
}
}
else if (ch == '<')
{
Text.NextCh();
if (Text.Ch() == '=')
{
_lex = Lex.LE;
Text.NextCh();
}
else if (Text.Ch() == '<')
{
Text.NextCh();
if (Text.Ch() == '=')
{
_lex = Lex.ASSLSHIFT; // <<= .
Text.NextCh();
}
else
{
_lex = Lex.LSHIFT; // <<.
}
}
else
{
_lex = Lex.LT; // <=.
}
}
else if (ch == '!')
{
Text.NextCh();
if (Text.Ch() == '=')
{
_lex = Lex.NE;
Text.NextCh();
}
else
{
_lex = Lex.INVERSION;
}
}
else if (ch == '~')
{
_lex = Lex.BITADD; //Bit addition.
Text.NextCh();
}
else if (ch == '?')
{
_lex = Lex.TERNARYIF; //Ternary operator.
Text.NextCh();
}
else if (ch == ':')
{
_lex = Lex.TERNARYELSE; //Ternary operator.
Text.NextCh();
}
else if (ch == '&')
{
Text.NextCh();
if (Text.Ch() == '&')
{
_lex = Lex.AND; // && .
Text.NextCh();
}
else if (Text.Ch() == '=')
{
_lex = Lex.ASSBITAND; // &= .
Text.NextCh();
}
else
{
_lex = Lex.BITAND; // &.
}
}
else if (ch == '|')
{
Text.NextCh();
if (Text.Ch() == '|')
{
_lex = Lex.OR;
Text.NextCh();
}
else if (Text.Ch() == '=')
{
_lex = Lex.ASSBITOR;
Text.NextCh();
}
else
{
_lex = Lex.BITOR;
}
}
else if (ch == '+')
{
Text.NextCh();
if (Text.Ch() == '+')
{
_lex = Lex.INC; // ++.
Text.NextCh();
}
else if (Text.Ch() == '=')
{
_lex = Lex.ASSADD;
Text.NextCh();
}
else
{
_lex = Lex.PLUS; // +.
}
}
else if (ch == '-')
{
Text.NextCh();
if (Text.Ch() == '-')
{
_lex = Lex.DEC; // --.
Text.NextCh();
}
else if (Text.Ch() == '=')
{
_lex = Lex.ASSMINUS; // =-.
Text.NextCh();
}
else
{
_lex = Lex.MINUS; // -.
}
}
else if (ch == '*')
{
Text.NextCh();
if (Text.Ch() == '=')
{
_lex = Lex.ASSMULT; // *= .
Text.NextCh();
}
else
{
_lex = Lex.MULT; //*.
}
}
else if (ch == '^')
{
Text.NextCh();
if (Text.Ch() == '=')
{
_lex = Lex.ASSXOR;
Text.NextCh();
}
else
{
_lex = Lex.XOR;
}
}
else if (ch == '%')
{
Text.NextCh();
if (Text.Ch() == '=')
{
_lex = Lex.ASSMOD;
Text.NextCh();
}
else
{
_lex = Lex.MOD;
}
}
else if (Char.IsDigit(ch))
{
ScanNumber();
}
else if (ch == (char)39)
{
ScanChar();
}
else if (ch == '"')
{
ScanString();
}
else if (ch == Text.ChEOT)
{
_lex = Lex.EOT;
}
else if (ch == '\\')
{
NextLex(UnicodeTranslate());
}
else
{
Error.LexError("Недопустимый символ");
}
}
/// <summary>Number literal scan.</summary>
public static void ScanNumber()
{
//Text.Ch() is first digit.
string octal = "01234567";
if (Text.Ch() == '0')
{
Text.NextCh();
if (Text.Ch() == 'x' || Text.Ch() == 'X')
{
_lex = NumberAnalysis.HexadecimalScan();
}
else if (octal.Contains(Text.Ch()))
{
_lex = NumberAnalysis.OctalNumber();
}
else if (Text.Ch() == 'L' || Text.Ch() == 'l')
{
Text.NextCh();
_lex = Lex.LONGLITERAL;
}
else if (Text.Ch() == 'F' || Text.Ch() == 'f')
{
Text.NextCh();
_lex = Lex.FLOATLITERAL;
}
else if (Text.Ch() == 'd' || Text.Ch() == 'D')
{
Text.NextCh();
_lex = Lex.DOUBLELITERAL;
}
else if (Char.IsDigit(Text.Ch()))
{
_lex = Lex.INTLITERAL;
}
else if (Text.Ch() == '.')
{
Text.NextCh();
_lex = NumberAnalysis.FractionalPart(false);
}
else if (Text.Ch() == 'e' || Text.Ch() == 'E')
{
_lex = NumberAnalysis.ExponentScan();
}
else if (Text.Ch() == '\\')
{
char check = UnicodeTranslate();
if (check == 'x' || check == 'X')
{
_lex = NumberAnalysis.HexadecimalScan();
}
else if (octal.Contains(check))
{
Text.NextCh();
_lex = NumberAnalysis.OctalNumber();
}
else if (check == 'L' || check == 'l')
{
Text.NextCh();
_lex = Lex.LONGLITERAL;
}
else if (check == 'F' || check == 'f')
{
Text.NextCh();
_lex = Lex.FLOATLITERAL;
}
else if (check == 'd' || check == 'D')
{
Text.NextCh();
_lex = Lex.DOUBLELITERAL;
}
else if (Char.IsDigit(check))
{
Count++;
NextLex(check);
_lex = Lex.INTLITERAL;
}
else if (check == '.')
{
Text.NextCh();
_lex = NumberAnalysis.FractionalPart(false);
}
else if (check == 'e' || check == 'E')
{
_lex = NumberAnalysis.ExponentScan();
}
else
{
Count++;
NextLex(check);
_lex = Lex.INTLITERAL;
}
}
else
{
_lex = Lex.INTLITERAL;
}
}
//If number in decimal number system.
else
{
_lex = NumberAnalysis.Number();
}
}
