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1 package jfun.parsec;
2
3 import jfun.parsec.trace.Trace;
4
5 final class TracedParser extends Parser {
6 private final Parser fwd;
7 private final Trace trace;
8
9 TracedParser(String  n, Parser fwd, Trace trace) {
10 super(n);
11 this.fwd = fwd;
12 this.trace = trace;
13 }
14 boolean apply(ParseContext ctxt) {
15 int original_step = ctxt.getStep();
16 int original_at = ctxt.getAt();
17 boolean ok = fwd.apply(ctxt);
18 final CharSequence src = ctxt.getSource();
19 final int ind = ctxt.getIndex();
20 final int steps = ctxt.getStep()-original_step;
21 final int offset = ctxt.getAt()-original_at;
22 if(ok){
23 trace.onSuccess(ctxt.getReturn(), src, ind, steps, offset);
24 }
25 else{
26 trace.onError(getException(ctxt.getError()), src, ind, steps, offset);
27 }
28 return ok;
29 }
30
31 private static Object getException(AbstractParsecError err){
32 return err==null?null:err.getException();
33 }
34 }
35 |
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