format.js

// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.




var assert = require('assert');
var util = require('../../');

assert.equal(util.format(), '');
assert.equal(util.format(''), '');
assert.equal(util.format([]), '[]');
assert.equal(util.format({}), '{}');
assert.equal(util.format(null), 'null');
assert.equal(util.format(true), 'true');
assert.equal(util.format(false), 'false');
assert.equal(util.format('test'), 'test');

// CHECKME this is for console.log() compatibility - but is it *right*?
assert.equal(util.format('foo', 'bar', 'baz'), 'foo bar baz');

assert.equal(util.format('%d', 42.0), '42');
assert.equal(util.format('%d', 42), '42');
assert.equal(util.format('%s', 42), '42');
assert.equal(util.format('%j', 42), '42');

assert.equal(util.format('%d', '42.0'), '42');
assert.equal(util.format('%d', '42'), '42');
assert.equal(util.format('%s', '42'), '42');
assert.equal(util.format('%j', '42'), '"42"');

assert.equal(util.format('%%s%s', 'foo'), '%sfoo');

assert.equal(util.format('%s'), '%s');
assert.equal(util.format('%s', undefined), 'undefined');
assert.equal(util.format('%s', 'foo'), 'foo');
assert.equal(util.format('%s:%s'), '%s:%s');
assert.equal(util.format('%s:%s', undefined), 'undefined:%s');
assert.equal(util.format('%s:%s', 'foo'), 'foo:%s');
assert.equal(util.format('%s:%s', 'foo', 'bar'), 'foo:bar');
assert.equal(util.format('%s:%s', 'foo', 'bar', 'baz'), 'foo:bar baz');
assert.equal(util.format('%%%s%%', 'hi'), '%hi%');
assert.equal(util.format('%%%s%%%%', 'hi'), '%hi%%');

(function() {
  var o = {};
  o.o = o;
  assert.equal(util.format('%j', o), '[Circular]');
})();

// Errors
assert.equal(util.format(new Error('foo')), '[Error: foo]');
function CustomError(msg) {
  Error.call(this);
  Object.defineProperty(this, 'message', { value: msg, enumerable: false });
  Object.defineProperty(this, 'name', { value: 'CustomError', enumerable: false });
}
util.inherits(CustomError, Error);
assert.equal(util.format(new CustomError('bar')), '[CustomError: bar]');