// 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;
}
// make sure that peeking starts at the current scan position
public void ResetPeek () { pt = tokens; }
// 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;
}
}
Token NextToken() {
int nestingLevel = 0;
while (ch == ' ' ||
ch >= 9 && ch <= 10 || ch == 13
) NextCh();
if (ch == '/' && Comment0() ||ch == '/' && Comment1()) return NextToken();
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();
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
case 1:
recEnd = pos; recKind = 1;
if (ch >= '0' && ch <= '9' || ch >= '@' && ch <= 'Z' || ch == '_' || ch >= 'a' && ch <= 'z') {AddCh(); goto case 1;}
else {t.kind = 1; t.val = new String(tval, 0, tlen); CheckLiteral(); return t;}
case 2:
if (ch >= '0' && ch <= '9') {AddCh(); goto case 3;}
else {goto case 0;}
case 3:
recEnd = pos; recKind = 3;
if (ch >= '0' && ch <= '9') {AddCh(); goto case 3;}
else if (ch == 'E' || ch == 'e') {AddCh(); goto case 4;}
else {t.kind = 3; break;}
case 4:
if (ch >= '0' && ch <= '9') {AddCh(); goto case 6;}
else if (ch == '+' || ch == '-') {AddCh(); goto case 5;}
else {goto case 0;}
case 5:
if (ch >= '0' && ch <= '9') {AddCh(); goto case 6;}
else {goto case 0;}
case 6:
recEnd = pos; recKind = 3;
if (ch >= '0' && ch <= '9') {AddCh(); goto case 6;}
else {t.kind = 3; break;}
case 7:
if (ch <= '!' || ch >= '#' && ch <= 65535) {AddCh(); goto case 7;}
else if (ch == '"') {AddCh(); goto case 8;}
else {goto case 0;}
case 8:
{t.kind = 4; break;}
case 9:
recEnd = pos; recKind = 6;
if (ch == '&' || ch >= '*' && ch <= '+' || ch == '-' || ch == '/' || ch >= '<' && ch <= '>' || ch == '|' || ch == '~') {AddCh(); goto case 9;}
else {t.kind = 6; t.val = new String(tval, 0, tlen); CheckLiteral(); return t;}
case 10:
recEnd = pos; recKind = 7;
if (ch == '&' || ch >= '*' && ch <= '+' || ch == '-' || ch == '/' || ch >= '<' && ch <= '>' || ch == '|' || ch == '~') {AddCh(); goto case 10;}
else {t.kind = 7; t.val = new String(tval, 0, tlen); CheckLiteral(); return t;}
case 11:
recEnd = pos; recKind = 8;
if (ch == '&' || ch >= '*' && ch <= '+' || ch == '-' || ch == '/' || ch >= '<' && ch <= '>' || ch == '|' || ch == '~') {AddCh(); goto case 11;}
else {t.kind = 8; t.val = new String(tval, 0, tlen); CheckLiteral(); return t;}
case 12:
recEnd = pos; recKind = 9;
if (ch == '&' || ch >= '*' && ch <= '+' || ch == '-' || ch == '/' || ch >= '<' && ch <= '>' || ch == '|' || ch == '~') {AddCh(); goto case 12;}
else {t.kind = 9; t.val = new String(tval, 0, tlen); CheckLiteral(); return t;}
case 13:
recEnd = pos; recKind = 10;
if (ch == '&' || ch >= '*' && ch <= '+' || ch == '-' || ch == '/' || ch >= '<' && ch <= '>' || ch == '|' || ch == '~') {AddCh(); goto case 13;}
else {t.kind = 10; t.val = new String(tval, 0, tlen); CheckLiteral(); return t;}
case 14:
{t.kind = 11; break;}
case 15:
{t.kind = 12; break;}
case 16:
{t.kind = 18; break;}
case 17:
{t.kind = 19; break;}
case 18:
{t.kind = 20; break;}
case 19:
{t.kind = 21; break;}
case 20:
if (ch == '<') { AddCh(); goto case 38; }
if (ch <= '"' || ch >= '$' && ch <= 65535) { AddCh(); goto case 20; }
else if (ch == '#') { AddCh(); goto case 23; }
else { goto case 0; }
case 21:
recEnd = pos; recKind = 2;
if (ch >= '0' && ch <= '9') {AddCh(); goto case 21;}
else if (ch == '.') {AddCh(); goto case 2;}
else {t.kind = 2; break;}
case 22:
recEnd = pos; recKind = 5;
if (ch == '.') {AddCh(); goto case 19;}
else {t.kind = 5; break;}
case 23:
if (ch <= '"' || ch >= '$' && ch <= '=' || ch >= '?' && ch <= 65535) {AddCh(); goto case 20;}
else if (ch == '#') {AddCh(); goto case 23;}
else if (ch == '>') {AddCh(); goto case 24;}
else {goto case 0;}
case 24:
recEnd = pos; recKind = 31;
nestingLevel--;
if (nestingLevel == 0) { goto case 0; }
if (ch <= '"' || ch >= '$' && ch <= 65535) { AddCh(); goto case 20; }
else if (ch == '#') { AddCh(); goto case 23; }
else { t.kind = 31; break; }
case 25:
{t.kind = 32; break;}
case 26:
{t.kind = 33; break;}
case 27:
{t.kind = 34; break;}
case 28:
{t.kind = 36; break;}
case 29:
{t.kind = 41; break;}
case 30:
{t.kind = 42; break;}
case 31:
{t.kind = 43; break;}
case 32:
{t.kind = 44; break;}
case 33:
{t.kind = 45; break;}
case 34:
{t.kind = 46; break;}
case 35:
{t.kind = 47; break;}
case 36:
{t.kind = 57; break;}
case 37:
recEnd = pos; recKind = 13;
if (ch == '=') {AddCh(); goto case 35;}
else {t.kind = 13; break;}
case 38:
recEnd = pos; recKind = 16;
if (ch == '#') { AddCh(); nestingLevel++; goto case 20; }
else if (ch == '=') { AddCh(); if (nestingLevel == 0) { goto case 32; } else { goto case 20; } }
else { goto case 20; }
case 39:
recEnd = pos; recKind = 17;
if (ch == '=') {AddCh(); goto case 32;}
else {t.kind = 17; break;}
case 40:
recEnd = pos; recKind = 35;
if (ch == '>') {AddCh(); goto case 30;}
else if (ch == '=') {AddCh(); goto case 34;}
else {t.kind = 35; break;}
case 41:
recEnd = pos; recKind = 58;
if (ch == '{') {AddCh(); goto case 29;}
else {t.kind = 58; break;}
}
t.val = new String(tval, 0, tlen);
return t;
}
void Init() {
pos = -1; line = 1; col = 0; charPos = -1;
oldEols = 0;
NextCh();
if (ch == 0xEF) { // check optional byte order mark for UTF-8
NextCh(); int ch1 = ch;
NextCh(); int ch2 = ch;
if (ch1 != 0xBB || ch2 != 0xBF) {
throw new FatalError(String.Format("illegal byte order mark: EF {0,2:X} {1,2:X}", ch1, ch2));
}
buffer = new UTF8Buffer(buffer); col = 0; charPos = -1;
NextCh();
}
pt = tokens = new Token(); // first token is a dummy
}
void Get () {
for (;;) {
t = la;
la = scanner.Scan();
if (la.kind <= maxT) { ++errDist; break; }
la = t;
}
}
public override void Parse() {
la = new Token();
la.val = "";
Get();
HydrogenParser();
Expect(0);
}
