public void Parse() { la = new Token(); la.val = ""; Get(); Taste(); Expect(0); }
void Get() { for (;;) { t = la; la = scanner.Scan(); if (la.kind <= maxT) { ++errDist; break; } la = t; } }
Token NextToken() { while (ch == ' ' || ch >= 9 && ch <= 10 || ch == 13 ) NextCh(); if (ch == '/' && Comment0() ||ch == '/' && Comment1() ||ch == '"' && Comment2()) 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 == '"' || ch == '&' || ch >= '.' && ch <= '9' || ch >= 'A' && 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 = 2; if (ch >= '0' && ch <= '9') {AddCh(); goto case 3;} else if (ch == '.') {AddCh(); goto case 4;} else {t.kind = 2; break;} case 4: recEnd = pos; recKind = 2; if (ch >= '0' && ch <= '9') {AddCh(); goto case 4;} else {t.kind = 2; break;} case 5: {t.kind = 4; break;} case 6: if (ch == 'o') {AddCh(); goto case 7;} else {goto case 0;} case 7: if (ch == 'r') {AddCh(); goto case 8;} else {goto case 0;} case 8: if (ch == 't') {AddCh(); goto case 9;} else {goto case 0;} case 9: if (ch == 'R') {AddCh(); goto case 10;} else {goto case 0;} case 10: if (ch == 'e') {AddCh(); goto case 11;} else {goto case 0;} case 11: if (ch == 'f') {AddCh(); goto case 12;} else {goto case 0;} case 12: {t.kind = 6; break;} case 13: if (ch == 'n') {AddCh(); goto case 14;} else {goto case 0;} case 14: if (ch == 's') {AddCh(); goto case 15;} else {goto case 0;} case 15: if (ch == 't') {AddCh(); goto case 16;} else {goto case 0;} case 16: if (ch == 'a') {AddCh(); goto case 17;} else {goto case 0;} case 17: if (ch == 'n') {AddCh(); goto case 18;} else {goto case 0;} case 18: if (ch == 'c') {AddCh(); goto case 19;} else {goto case 0;} case 19: if (ch == 'e') {AddCh(); goto case 20;} else {goto case 0;} case 20: if (ch == 'R') {AddCh(); goto case 21;} else {goto case 0;} case 21: if (ch == 'e') {AddCh(); goto case 22;} else {goto case 0;} case 22: if (ch == 'f') {AddCh(); goto case 23;} else {goto case 0;} case 23: {t.kind = 7; break;} case 24: recEnd = pos; recKind = 3; if (ch == 'p') {AddCh(); goto case 6;} else if (ch == 'i') {AddCh(); goto case 13;} else {t.kind = 3; 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 }
// 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; }
// 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; }