// 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); }