apg-js-examples/src/trace/limited-lines.js

Examples of using the suite of apg-js applications and libraries.

/*  *************************************************************************************
 *   copyright: Copyright (c) 2021 Lowell D. Thomas, all rights reserved
 *     license: BSD-2-Clause (https://opensource.org/licenses/BSD-2-Clause)
 *   ********************************************************************************* */
// Often the trace will put out many thousands of records,
// whereas, for an HTML web page, usually no more than 5,000-10,000 is practical.
// The trace records filter can limit the number of lines to the last `N`.
// Usually, if you are looking for an error, it will occur near the end of the parse anyway
// and this becomes a handy way to clip off the initial records.
(function limitedLines() {
  const setup = require('./setup');
  const { apgLib } = require('apg-js');
  // eslint-disable-next-line new-cap
  const trace = new apgLib.trace();
  let number;
  trace.filter.operators.tls = true;
  trace.filter.operators.tbs = true;
  trace.filter.operators.trg = true;
  trace.filter.rules['<ALL>'] = true;
  trace.setMaxRecords(100);
  number = ';display last 100 records only\n';
  number += ';ornament number\n';
  number += '\u2768555\u2769888\u20129999\n';
  setup(trace, number, 'limited-lines');
})();