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Java > Open Source Codes > jfun > parsec > StepParser


1 /**
2  *
3  */
4 package jfun.parsec;
5
6 final class StepParser<R> extends Parser<R> {
7   private final Parser<R> p;
8
9   private final int n;
10
11   StepParser(String JavaDoc name, Parser<R> p, int n) {
12     super(name);
13     this.p = p;
14     this.n = n;
15   }
16
17   boolean apply(final ParseContext ctxt) {
18     final int step = ctxt.getStep();
19     if (!p.parse(ctxt))
20       return false;
21     ctxt.setStep(step + n);
22     return true;
23   }
24 }
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