// peek for the next token, ignore pragmas
public Token Peek()
{
do {
if (pt.next == null) {
pt.next = NextToken();
}
pt = pt.next;
} while (pt.kind > maxT); // skip pragmas
return pt;
}
// get the next token (possibly a token already seen during peeking)
public Token Scan()
{
if (tokens.next == null) {
return NextToken();
} else {
pt = tokens = tokens.next;
return tokens;
}
}
// make sure that peeking starts at the current scan position
public void ResetPeek()
{
pt = tokens;
}
Token NextToken()
{
while (ch == ' ' ||
ch >= 9 && ch <= 10 || ch == 13
) NextCh();
int recKind = noSym;
int recEnd = pos;
t = new Token();
t.pos = pos; t.col = col; t.line = line; t.charPos = charPos;
int state;
if (start.ContainsKey(ch)) { state = (int) start[ch]; }
else { state = 0; }
tlen = 0; AddCh();
/*old way
switch (state) {
case -1: { t.kind = eofSym; break; } // NextCh already done
case 0: {
if (recKind != noSym) {
tlen = recEnd - t.pos;
SetScannerBehindT();
}
t.kind = recKind; break;
} // NextCh already done
<--scan3
}
old way*/
//new way begin
bool done = false;
while(!done) {
switch (state) {
case -1: { t.kind = eofSym; done = true; break; } // NextCh already done
case 0: {
if (recKind != noSym) {
tlen = recEnd - t.pos;
SetScannerBehindT();
}
t.kind = recKind; done = true; break;
} // NextCh already done
case 1:
recEnd = pos; recKind = 1;
if (ch >= '0' && ch <= '9' || ch >= 'A' && ch <= 'Z' || ch >= 'a' && ch <= 'z') { AddCh(); state = 1; break; }
else {t.kind = 1; done = true; break;}
case 2:
if (ch >= '0' && ch <= '9') { AddCh(); state = 3; break; }
else { state = 0; break; }
case 3:
recEnd = pos; recKind = 3;
if (ch >= '0' && ch <= '9') { AddCh(); state = 3; break; }
else {t.kind = 3; done = true; break;}
case 4:
recEnd = pos; recKind = 2;
if (ch >= '0' && ch <= '9') { AddCh(); state = 4; break; }
else if (ch == '.') { AddCh(); state = 2; break; }
else {t.kind = 2; done = true; break;}
case 5:
{t.kind = 4; done = true; break;}
case 6:
{t.kind = 5; done = true; break;}
case 7:
{t.kind = 6; done = true; break;}
case 8:
{t.kind = 7; done = true; break;}
case 9:
{t.kind = 8; done = true; break;}
case 10:
{t.kind = 9; done = true; break;}
case 11:
{t.kind = 10; done = true; break;}
case 12:
{t.kind = 11; done = true; break;}
case 13:
{t.kind = 12; done = true; break;}
}
}
//new way end
t.val = string.Empty;//TODO performance!!!
for(int i = 0; i < tlen; i++) {
t.val += tval[i];
}
//t.val = new String(tval, 0, tlen);
return t;
}
void Init()
{
pos = -1; line = 1; col = 0; charPos = -1;
oldEols = 0;
NextCh();
pt = tokens = new Token(); // first token is a dummy
}
