text: var parserGrammar = require('./grammars/parens.js');
  const Parser = require('../dist/parser');
  function nspace(n) {
  	var out = "";
  	for (var i=0; i<n; i++) {
  		out += " ";
  	}
  	return out;
  }
  
  function profile(n, type) {
  	var test = "";
  	for (var i=0; i<n; i++) {
  		test += "(";
  	}
  	test += "acowcowcowcowcowcowcowcowcow";
  	for (var i=0; i<n; i++) {
  		test += ")";
  	}
  	var starttime = process.hrtime();
  	var startmemory = process.memoryUsage().heapUsed;
  	var p = new Parser(parserGrammar.ParserRules, parserGrammar.ParserStart).feed(test);
  	console.assert(p.results[0]);
  	switch (type) {
  	case "TIME":
  		var tdiff = process.hrtime(starttime)[1];
  		console.log(
  			nspace(Math.round(tdiff/1e9  *80))+"*" // how much of one second
  		);
  		break;
  	case "MEMO":
  		var mdiff = process.memoryUsage().heapUsed - startmemory;
  		console.log(
  			nspace(Math.round(mdiff/1e8  *80)) + "+"
  		);
  	}
  }
  
  console.log("Nearley test.");
  console.log("=============");
  console.log("Tests operate on the grammar p -> \"(\" p \")\" | [a-z]");
  console.log("An input of size n is 2n+1 characters long, and of the form (((...a...))).");
  console.log();
  
  
  console.log("Running time tests.");
  console.log("-------------------");
  console.log("Each star corresponds to the time taken to parse an input of that size with a recursive grammar.");
  console.log();
  console.log("SCALE");
  console.log(nspace(20) + "0.25s");
  console.log(nspace(40) + "0.50s");
  console.log(nspace(60) + "0.75s");
  console.log(nspace(80) + "1.00s");
  
  for (var i=0; i<5e4; i+=2e3) {
  	if (i%1e4 === 0) {
  		console.log(i);
  	}
  	profile(i, "TIME");
  }
  
  
  console.log("Running memory tests.");
  console.log("-------------------");
  console.log("Each star corresponds to the memory taken to parse an input of that size with a recursive grammar.");
  console.log("Occasional outliers may be caused by gc runs. Nearley profiling doesn't explicitly call the gc before each run.");
  console.log();
  console.log("SCALE");
  console.log(nspace(20) + "025MB");
  console.log(nspace(40) + "050MB");
  console.log(nspace(60) + "075MB");
  console.log(nspace(80) + "100MB");
  
  for (var i=0; i<5e4; i+=2e3) {
  	if (i%1e4 === 0) {
  		console.log(i);
  	}
  	profile(i, "MEMO");
  }
  