dynatrace-cordova-outsystems-plugin/node_modules/extsprintf/lib/extsprintf.js

This plugin gives you the ability to use the Dynatrace instrumentation in your hybrid application (Cordova, Ionic, ..). It uses the Mobile Agent, the JavaScript Agent and the Javascript Bridge. The Mobile Agent will give you all device specific values con

/*
 * extsprintf.js: extended POSIX-style sprintf
 */

var mod_assert = require('assert');
var mod_util = require('util');

/*
 * Public interface
 */
exports.sprintf = jsSprintf;
exports.printf = jsPrintf;
exports.fprintf = jsFprintf;

/*
 * Stripped down version of s[n]printf(3c).  We make a best effort to throw an
 * exception when given a format string we don't understand, rather than
 * ignoring it, so that we won't break existing programs if/when we go implement
 * the rest of this.
 *
 * This implementation currently supports specifying
 *	- field alignment ('-' flag),
 * 	- zero-pad ('0' flag)
 *	- always show numeric sign ('+' flag),
 *	- field width
 *	- conversions for strings, decimal integers, and floats (numbers).
 *	- argument size specifiers.  These are all accepted but ignored, since
 *	  Javascript has no notion of the physical size of an argument.
 *
 * Everything else is currently unsupported, most notably precision, unsigned
 * numbers, non-decimal numbers, and characters.
 */
function jsSprintf(fmt)
{
	var regex = [
	    '([^%]*)',				/* normal text */
	    '%',				/* start of format */
	    '([\'\\-+ #0]*?)',			/* flags (optional) */
	    '([1-9]\\d*)?',			/* width (optional) */
	    '(\\.([1-9]\\d*))?',		/* precision (optional) */
	    '[lhjztL]*?',			/* length mods (ignored) */
	    '([diouxXfFeEgGaAcCsSp%jr])'	/* conversion */
	].join('');

	var re = new RegExp(regex);
	var args = Array.prototype.slice.call(arguments, 1);
	var flags, width, precision, conversion;
	var left, pad, sign, arg, match;
	var ret = '';
	var argn = 1;

	mod_assert.equal('string', typeof (fmt));

	while ((match = re.exec(fmt)) !== null) {
		ret += match[1];
		fmt = fmt.substring(match[0].length);

		flags = match[2] || '';
		width = match[3] || 0;
		precision = match[4] || '';
		conversion = match[6];
		left = false;
		sign = false;
		pad = ' ';

		if (conversion == '%') {
			ret += '%';
			continue;
		}

		if (args.length === 0)
			throw (new Error('too few args to sprintf'));

		arg = args.shift();
		argn++;

		if (flags.match(/[\' #]/))
			throw (new Error(
			    'unsupported flags: ' + flags));

		if (precision.length > 0)
			throw (new Error(
			    'non-zero precision not supported'));

		if (flags.match(/-/))
			left = true;

		if (flags.match(/0/))
			pad = '0';

		if (flags.match(/\+/))
			sign = true;

		switch (conversion) {
		case 's':
			if (arg === undefined || arg === null)
				throw (new Error('argument ' + argn +
				    ': attempted to print undefined or null ' +
				    'as a string'));
			ret += doPad(pad, width, left, arg.toString());
			break;

		case 'd':
			arg = Math.floor(arg);
			/*jsl:fallthru*/
		case 'f':
			sign = sign && arg > 0 ? '+' : '';
			ret += sign + doPad(pad, width, left,
			    arg.toString());
			break;

		case 'x':
			ret += doPad(pad, width, left, arg.toString(16));
			break;

		case 'j': /* non-standard */
			if (width === 0)
				width = 10;
			ret += mod_util.inspect(arg, false, width);
			break;

		case 'r': /* non-standard */
			ret += dumpException(arg);
			break;

		default:
			throw (new Error('unsupported conversion: ' +
			    conversion));
		}
	}

	ret += fmt;
	return (ret);
}

function jsPrintf() {
	var args = Array.prototype.slice.call(arguments);
	args.unshift(process.stdout);
	jsFprintf.apply(null, args);
}

function jsFprintf(stream) {
	var args = Array.prototype.slice.call(arguments, 1);
	return (stream.write(jsSprintf.apply(this, args)));
}

function doPad(chr, width, left, str)
{
	var ret = str;

	while (ret.length < width) {
		if (left)
			ret += chr;
		else
			ret = chr + ret;
	}

	return (ret);
}

/*
 * This function dumps long stack traces for exceptions having a cause() method.
 * See node-verror for an example.
 */
function dumpException(ex)
{
	var ret;

	if (!(ex instanceof Error))
		throw (new Error(jsSprintf('invalid type for %%r: %j', ex)));

	/* Note that V8 prepends "ex.stack" with ex.toString(). */
	ret = 'EXCEPTION: ' + ex.constructor.name + ': ' + ex.stack;

	if (ex.cause && typeof (ex.cause) === 'function') {
		var cex = ex.cause();
		if (cex) {
			ret += '\nCaused by: ' + dumpException(cex);
		}
	}

	return (ret);
}