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1 package hudson.scheduler;
2
3 import antlr.ANTLRException;
4 import antlr.LLkParser;
5 import antlr.ParserSharedInputState;
6 import antlr.SemanticException;
7 import antlr.Token;
8 import antlr.TokenBuffer;
9 import antlr.TokenStream;
10 import antlr.TokenStreamException;
11
12
15 abstract class BaseParser extends LLkParser {
16 private static final int[] LOWER_BOUNDS = new int[] {0,0,1,0,0};
17 private static final int[] UPPER_BOUNDS = new int[] {59,23,31,12,7};
18
19 protected BaseParser(int i) {
20 super(i);
21 }
22
23 protected BaseParser(ParserSharedInputState parserSharedInputState, int i) {
24 super(parserSharedInputState, i);
25 }
26
27 protected BaseParser(TokenBuffer tokenBuffer, int i) {
28 super(tokenBuffer, i);
29 }
30
31 protected BaseParser(TokenStream tokenStream, int i) {
32 super(tokenStream, i);
33 }
34
35 protected long doRange(int start, int end, int step, int field) throws ANTLRException {
36 rangeCheck(start, field);
37 rangeCheck(end, field);
38 if (step <= 0)
39 error("step must be positive, but found " + step);
40 if (start>end)
41 error("You mean "+end+'-'+start+'?');
42
43 long bits = 0;
44 for (int i = start; i <= end; i += step) {
45 bits |= 1L << i;
46 }
47 return bits;
48 }
49
50 protected long doRange( int step, int field ) throws ANTLRException {
51 return doRange( LOWER_BOUNDS[field], UPPER_BOUNDS[field], step, field );
52 }
53
54 protected void rangeCheck(int value, int field) throws ANTLRException {
55 if( value<LOWER_BOUNDS[field] || UPPER_BOUNDS[field]<value ) {
56 error(value +" is an invalid value. Must be within "+
57 LOWER_BOUNDS[field]+" and "+UPPER_BOUNDS[field]);
58 }
59 }
60
61 private void error(String  msg) throws TokenStreamException, SemanticException {
62 Token token = LT(0);
63 throw new SemanticException(
64 msg,
65 token.getFilename(),
66 token.getLine(),
67 token.getColumn()
68 );
69 }
70 }
71 |
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