void Get () { for (;;) { t = la; la = scanner.Scan(); if (la.kind <= maxT) { ++errDist; break; } la = t; } }
// 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; }
// 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() { 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(); 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: if (ch == 'n') {AddCh(); goto case 13;} else {goto case 0;} case 2: if (ch == 'b') {AddCh(); goto case 13;} else {goto case 0;} case 3: if (ch == 'r') {AddCh(); goto case 13;} else {goto case 0;} case 4: if (ch == 'r') {AddCh(); goto case 13;} else {goto case 0;} case 5: if (ch == 'i') {AddCh(); goto case 13;} else {goto case 0;} case 6: if (ch == 'g') {AddCh(); goto case 13;} else {goto case 0;} case 7: if (ch == 'p') {AddCh(); goto case 13;} else {goto case 0;} case 8: if (ch == 'k') {AddCh(); goto case 9;} else {goto case 0;} case 9: if (ch == 't') {AddCh(); goto case 13;} else {goto case 0;} case 10: if (ch == 'o') {AddCh(); goto case 11;} else {goto case 0;} case 11: if (ch == 'v') {AddCh(); goto case 13;} else {goto case 0;} case 12: if (ch == 'z') {AddCh(); goto case 13;} else {goto case 0;} case 13: {t.kind = 1; break;} case 14: if (ch == 'n') {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 == 'g') {AddCh(); goto case 52;} else {goto case 0;} case 18: if (ch == 'e') {AddCh(); goto case 19;} else {goto case 0;} case 19: if (ch == 'n') {AddCh(); goto case 20;} else {goto case 0;} case 20: if (ch == 's') {AddCh(); goto case 21;} else {goto case 0;} case 21: if (ch == 't') {AddCh(); goto case 22;} else {goto case 0;} case 22: if (ch == 'a') {AddCh(); goto case 23;} else {goto case 0;} case 23: if (ch == 'g') {AddCh(); goto case 52;} else {goto case 0;} case 24: if (ch == 't') {AddCh(); goto case 25;} else {goto case 0;} case 25: if (ch == 'w') {AddCh(); goto case 26;} else {goto case 0;} case 26: if (ch == 'o') {AddCh(); goto case 27;} else {goto case 0;} case 27: if (ch == 'c') {AddCh(); goto case 28;} else {goto case 0;} case 28: if (ch == 'h') {AddCh(); goto case 52;} else {goto case 0;} case 29: if (ch == 'n') {AddCh(); goto case 30;} else {goto case 0;} case 30: if (ch == 'n') {AddCh(); goto case 31;} else {goto case 0;} case 31: if (ch == 'e') {AddCh(); goto case 32;} else {goto case 0;} case 32: if (ch == 'r') {AddCh(); goto case 33;} else {goto case 0;} case 33: if (ch == 's') {AddCh(); goto case 34;} else {goto case 0;} case 34: if (ch == 't') {AddCh(); goto case 35;} else {goto case 0;} case 35: if (ch == 'a') {AddCh(); goto case 36;} else {goto case 0;} case 36: if (ch == 'g') {AddCh(); goto case 52;} else {goto case 0;} case 37: if (ch == 'e') {AddCh(); goto case 38;} else {goto case 0;} case 38: if (ch == 'i') {AddCh(); goto case 39;} else {goto case 0;} case 39: if (ch == 't') {AddCh(); goto case 40;} else {goto case 0;} case 40: if (ch == 'a') {AddCh(); goto case 41;} else {goto case 0;} case 41: if (ch == 'g') {AddCh(); goto case 52;} else {goto case 0;} case 42: if (ch == 'm') {AddCh(); goto case 43;} else {goto case 0;} case 43: if (ch == 's') {AddCh(); goto case 44;} else {goto case 0;} case 44: if (ch == 't') {AddCh(); goto case 45;} else {goto case 0;} case 45: if (ch == 'a') {AddCh(); goto case 46;} else {goto case 0;} case 46: if (ch == 'g') {AddCh(); goto case 52;} else {goto case 0;} case 47: if (ch == 'n') {AddCh(); goto case 48;} else {goto case 0;} case 48: if (ch == 'n') {AddCh(); goto case 49;} else {goto case 0;} case 49: if (ch == 't') {AddCh(); goto case 50;} else {goto case 0;} case 50: if (ch == 'a') {AddCh(); goto case 51;} else {goto case 0;} case 51: if (ch == 'g') {AddCh(); goto case 52;} else {goto case 0;} case 52: {t.kind = 2; break;} case 53: if (ch == 'd') {AddCh(); goto case 54;} else {goto case 0;} case 54: {t.kind = 3; break;} case 55: recEnd = pos; recKind = 4; if (ch >= '0' && ch <= '9') {AddCh(); goto case 55;} else {t.kind = 4; break;} case 56: recEnd = pos; recKind = 3; if (ch == 'a') {AddCh(); goto case 1;} else if (ch == 'u') {AddCh(); goto case 62;} else {t.kind = 3; break;} case 57: if (ch == 'e') {AddCh(); goto case 2;} else if (ch == 'r') {AddCh(); goto case 37;} else {goto case 0;} case 58: recEnd = pos; recKind = 3; if (ch == 228) {AddCh(); goto case 3;} else if (ch == 'a') {AddCh(); goto case 5;} else if (ch == 'o') {AddCh(); goto case 14;} else if (ch == 'i') {AddCh(); goto case 63;} else {t.kind = 3; break;} case 59: if (ch == 'p') {AddCh(); goto case 4;} else if (ch == 'u') {AddCh(); goto case 6;} else {goto case 0;} case 60: if (ch == 'e') {AddCh(); goto case 7;} else if (ch == 'a') {AddCh(); goto case 42;} else if (ch == 'o') {AddCh(); goto case 47;} else if (ch == 't') {AddCh(); goto case 53;} else {goto case 0;} case 61: if (ch == 'e') {AddCh(); goto case 12;} else if (ch == 'i') {AddCh(); goto case 18;} else if (ch == 'o') {AddCh(); goto case 29;} else {goto case 0;} case 62: if (ch == 'l' || ch == 'n') {AddCh(); goto case 13;} else {goto case 0;} case 63: if (ch == 't') {AddCh(); goto case 24;} else if (ch == 'n') {AddCh(); goto case 54;} else {goto case 0;} case 64: {t.kind = 5; break;} case 65: {t.kind = 6; 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 }
public void Parse() { la = new Token(); la.val = ""; Get(); Followup(); Expect(0); }