/**
* ==== IMPORTANT ====
* This should never again be public because it does not honour the
* chunks defined by actions+collect mode. It only honours chunks of
* actions. This should not be made visible to the outside.
*
* <p>calls {@link #next} once and applies the returned {@link
* FaAction}. This includes the special actions configured for non
* matching input and EOF, if any.</p>
*
* <p>Due to the <code>FaAction<code> applied to <code>out</code>
* after calling <code>next</code> anything can happen to
* <code>out</code>. In particular it need not become longer.</p>
*
* @return <code>false</code> if <code>out</code> was not changed
* and would not be changed — due to EOF — by any
* subsequent calls to this method. If <code>true</code> is
* returned, <code>out</code> is not necessarily changed, but there
* is more input available to process.
*/
private boolean crunch(StringBuilder out) throws java.io.IOException {
int l = out.length();
action = next(out);
if (action == null) return true;
if (action == EOF) {
// there may have been some unmatched characters added to out
// just before EOF was hit
return l < out.length();
}
try {
action.invoke(out, matchStart, this);
} catch (CallbackException e) {
String msg;
if (matchStart <= out.length()) {
msg =
e.getMessage()
+ ". The match, possibly changed by the complaining "
+ "action, follows in "
+ "double brackets:\n[["
+ out.substring(matchStart)
+ "]]";
} else {
msg =
e.getMessage()
+ ". Matched and filtered data just before the "
+ "match triggering the exception is: `"
+ out
+ "'";
}
CallbackException ee = new CallbackException(msg);
ee.setStackTrace(e.getStackTrace());
ee.initCause(e.getCause());
throw ee;
}
return true;
}
