HORIZON PROJECT

/**

 * Module dependencies.

 */

var AssertionError = require('assert').AssertionError

  , callsite = require('callsite')

  , fs = require('fs')

/**

 * Expose `assert`.

 */

module.exports = process.env.NO_ASSERT

  ? function(){}

  : assert;

/**

 * Assert the given `expr`.

 */

function assert(expr) {

  if (expr) return;

  var stack = callsite();

  var call = stack[1];

  var file = call.getFileName();

  var lineno = call.getLineNumber();

  var src = fs.readFileSync(file, 'utf8');

  var line = src.split('\n')[lineno-1];

  var src = line.match(/assert\((.*)\)/)[1];

  var err = new AssertionError({

    message: src,

    stackStartFunction: stack[0].getFunction()

  });

  throw err;

}