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1
4 package jfun.parsec;
5
6 final class DelimitedByParser<R, E1, R1, E extends E1> extends Parser<R> {
7 private final Parser<E> p;
8
9 private final Accumulatable<E1, R1> accm;
10
11 private final Parser<?> delim;
12
13 DelimitedByParser(String  n, Parser<E> p, Accumulatable<E1, R1> accm, Parser<?> delim) {
14 super(n);
15 this.p = p;
16 this.accm = accm;
17 this.delim = delim;
18 }
19
20 boolean apply(final ParseContext ctxt) {
21 final Accumulator<E1, R1> acc = accm.getAccumulator();
22 for (;;) {
23 final int at0 = ctxt.getAt();
24 boolean r = delim.parse(ctxt);
25 final int at1 = ctxt.getAt();
26 if (!r) {
27 if (at0 != at1) {
28 return false;
29 }
30 return ParserInternals.returnValue(acc.getResult(), ctxt);
31 }
32 r = p.parse(ctxt);
33 final int at2 = ctxt.getAt();
34 if (!r) {
35 if (at1 != at2) {
36 return false;
37 }
38 return ParserInternals.returnValue(acc.getResult(), ctxt);
39 }
40 if (ParserInternals.isInfiniteLoop(at0, at2)) {
41 return true;
42 }
43 acc.accumulate(p.getReturn(ctxt));
44 }
45 }
46 } |
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