<!DOCTYPE html>
<title>Custom Elements: Element definition</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<body>
<div id="log"></div>
<iframe id="iframe"></iframe>
<script>
'use strict';
(() =>  {
  // Element definition
  // https://html.spec.whatwg.org/multipage/scripting.html#element-definition

  // Use window from iframe to isolate the test.
  const iframe = document.getElementById("iframe");
  const testWindow = iframe.contentDocument.defaultView;
  const customElements = testWindow.customElements;

  let testable = false;
  test(() =>  {
    assert_true('customElements' in testWindow, '"window.customElements" exists');
    assert_true('define' in customElements, '"window.customElements.define" exists');
    testable = true;
  }, '"window.customElements.define" should exists');
  if (!testable)
    return;

  const expectTypeError = testWindow.TypeError;
  // Following errors are DOMException, not JavaScript errors.
  const expectSyntaxError = 'SYNTAX_ERR';
  const expectNotSupportedError = 'NOT_SUPPORTED_ERR';

  // 1. If IsConstructor(constructor) is false,
  // then throw a TypeError and abort these steps.
  test(() =>  {
    assert_throws_js(expectTypeError, () =>  {
      customElements.define();
    });
  }, 'If no arguments, should throw a TypeError');
  test(() =>  {
    assert_throws_js(expectTypeError, () =>  {
      customElements.define('test-define-one-arg');
    });
  }, 'If one argument, should throw a TypeError');
  [
    [ 'undefined', undefined ],
    [ 'null', null ],
    [ 'object', {} ],
    [ 'string', 'string' ],
    [ 'arrow function', () => {} ], // IsConstructor returns false for arrow functions
    [ 'method', ({ m() { } }).m ], // IsConstructor returns false for methods
  ].forEach(t =>  {
    test(() =>  {
      assert_throws_js(expectTypeError, () =>  {
        customElements.define(`test-define-constructor-${t[0]}`, t[1]);
      });
    }, `If constructor is ${t[0]}, should throw a TypeError`);
  });

  // 2. If name is not a valid custom element name,
  // then throw a SyntaxError and abort these steps.
  let validCustomElementNames = [
    // [a-z] (PCENChar)* '-' (PCENChar)*
    // https://html.spec.whatwg.org/multipage/scripting.html#valid-custom-element-name
    'a-',
    'a-a',
    'aa-',
    'aa-a',
    'a-.-_',
    'a-0123456789',
    'a-\u6F22\u5B57', // Two CJK Unified Ideographs
    'a-\uD840\uDC0B', // Surrogate pair U+2000B
  ];
  let invalidCustomElementNames = [
    undefined,
    null,
    '',
    '-',
    'a',
    'input',
    'mycustomelement',
    'A',
    'A-',
    '0-',
    'a-A',
    'a-Z',
    'A-a',
    'a-a\u00D7',
    'a-a\u3000',
    'a-a\uDB80\uDC00', // Surrogate pair U+F0000
    // name must not be any of the hyphen-containing element names.
    'annotation-xml',
    'color-profile',
    'font-face',
    'font-face-src',
    'font-face-uri',
    'font-face-format',
    'font-face-name',
    'missing-glyph',
  ];
  validCustomElementNames.forEach(name =>  {
    test(() =>  {
      customElements.define(name, class {});
    }, `Element names: defining an element named ${name} should succeed`);
  });
  invalidCustomElementNames.forEach(name =>  {
    test(() =>  {
      assert_throws_dom(expectSyntaxError, testWindow.DOMException, () =>  {
        customElements.define(name, class {});
      });
    }, `Element names: defining an element named ${name} should throw a SyntaxError`);
  });

  // 3. If this CustomElementRegistry contains an entry with name name,
  // then throw a NotSupportedError and abort these steps.
  test(() =>  {
    customElements.define('test-define-dup-name', class {});
    assert_throws_dom(expectNotSupportedError, testWindow.DOMException, () =>  {
      customElements.define('test-define-dup-name', class {});
    });
  }, 'If the name is already defined, should throw a NotSupportedError');

  // 5. If this CustomElementRegistry contains an entry with constructor constructor,
  // then throw a NotSupportedError and abort these steps.
  test(() =>  {
    class TestDupConstructor {};
    customElements.define('test-define-dup-constructor', TestDupConstructor);
    assert_throws_dom(expectNotSupportedError, testWindow.DOMException, () =>  {
      customElements.define('test-define-dup-ctor2', TestDupConstructor);
    });
  }, 'If the constructor is already defined, should throw a NotSupportedError');

  // 12.1. Let prototype be Get(constructor, "prototype"). Rethrow any exceptions.
  const err = new Error('check this is rethrown');
  err.name = 'rethrown';
  function assert_rethrown(func, description) {
    assert_throws_exactly(err, func, description);
  }
  function throw_rethrown_error() {
    throw err;
  }
  test(() =>  {
    // Hack for prototype to throw while IsConstructor is true.
    const BadConstructor = (function () { }).bind({});
    Object.defineProperty(BadConstructor, 'prototype', {
      get() { throw_rethrown_error(); }
    });
    assert_rethrown(() =>  {
      customElements.define('test-define-constructor-prototype-rethrow', BadConstructor);
    });
  }, 'If constructor.prototype throws, should rethrow');

  // 12.2. If Type(prototype) is not Object,
  // then throw a TypeError exception.
  test(() =>  {
    const c = (function () { }).bind({}); // prototype is undefined.
    assert_throws_js(expectTypeError, () =>  {
      customElements.define('test-define-constructor-prototype-undefined', c);
    });
  }, 'If Type(constructor.prototype) is undefined, should throw a TypeError');
  test(() =>  {
    function c() {};
    c.prototype = 'string';
    assert_throws_js(expectTypeError, () =>  {
      customElements.define('test-define-constructor-prototype-string', c);
    });
  }, 'If Type(constructor.prototype) is string, should throw a TypeError');

  // 12.3. Let lifecycleCallbacks be a map with the four keys "connectedCallback",
  // "disconnectedCallback", "adoptedCallback", and "attributeChangedCallback",
  // each of which belongs to an entry whose value is null.
  // 12.4. For each of the four keys callbackName in lifecycleCallbacks:
  // 12.4.1. Let callbackValue be Get(prototype, callbackName). Rethrow any exceptions.
  // 12.4.2. If callbackValue is not undefined, then set the value of the entry in
  // lifecycleCallbacks with key callbackName to the result of converting callbackValue
  // to the Web IDL Function callback type. Rethrow any exceptions from the conversion.
  [
    'connectedCallback',
    'disconnectedCallback',
    'adoptedCallback',
    'attributeChangedCallback',
  ].forEach(name => {
    test(() => {
      class C {
        get [name]() { throw_rethrown_error(); }
      }
      assert_rethrown(() => {
        customElements.define(`test-define-${name.toLowerCase()}-rethrow`, C);
      });
    }, `If constructor.prototype.${name} throws, should rethrow`);

    [
      { name: 'undefined', value: undefined, success: true },
      { name: 'function', value: function () { }, success: true },
      { name: 'null', value: null, success: false },
      { name: 'object', value: {}, success: false },
      { name: 'integer', value: 1, success: false },
    ].forEach(data => {
      test(() => {
        class C { };
        C.prototype[name] = data.value;
        if (data.success) {
          customElements.define(`test-define-${name.toLowerCase()}-${data.name}`, C);
        } else {
          assert_throws_js(expectTypeError, () => {
            customElements.define(`test-define-${name.toLowerCase()}-${data.name}`, C);
          });
        }
      }, `If constructor.prototype.${name} is ${data.name}, should ${data.success ? 'succeed' : 'throw a TypeError'}`);
    });
  });
})();
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