function ownKeys(object, enumerableOnly) { var keys = Object.keys(object); if (Object.getOwnPropertySymbols) { var symbols = Object.getOwnPropertySymbols(object); if (enumerableOnly) symbols = symbols.filter(function (sym) { return Object.getOwnPropertyDescriptor(object, sym).enumerable; }); keys.push.apply(keys, symbols); } return keys; }

function _objectSpread(target) { for (var i = 1; i < arguments.length; i++) { var source = arguments[i] != null ? arguments[i] : {}; if (i % 2) { ownKeys(Object(source), true).forEach(function (key) { _defineProperty(target, key, source[key]); }); } else if (Object.getOwnPropertyDescriptors) { Object.defineProperties(target, Object.getOwnPropertyDescriptors(source)); } else { ownKeys(Object(source)).forEach(function (key) { Object.defineProperty(target, key, Object.getOwnPropertyDescriptor(source, key)); }); } } return target; }

function _defineProperty(obj, key, value) { if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }

import Vue from '../../utils/vue';
import { mergeData } from 'vue-functional-data-merge';
import KeyCodes from '../../utils/key-codes';
import pluckProps from '../../utils/pluck-props';
import { concat } from '../../utils/array';
import { getComponentConfig } from '../../utils/config';
import { addClass, removeClass } from '../../utils/dom';
import { isBoolean, isEvent, isFunction } from '../../utils/inspect';
import { keys } from '../../utils/object';
import { toString } from '../../utils/string';
import { BLink, propsFactory as linkPropsFactory } from '../link/link'; // --- Constants --

var NAME = 'BButton';
var btnProps = {
  block: {
    type: Boolean,
    default: false
  },
  disabled: {
    type: Boolean,
    default: false
  },
  size: {
    type: String,
    default: function _default() {
      return getComponentConfig(NAME, 'size');
    }
  },
  variant: {
    type: String,
    default: function _default() {
      return getComponentConfig(NAME, 'variant');
    }
  },
  type: {
    type: String,
    default: 'button'
  },
  tag: {
    type: String,
    default: 'button'
  },
  pill: {
    type: Boolean,
    default: false
  },
  squared: {
    type: Boolean,
    default: false
  },
  pressed: {
    // Tri-state: `true`, `false` or `null`
    // => On, off, not a toggle
    type: Boolean,
    default: null
  }
};
var linkProps = linkPropsFactory();
delete linkProps.href.default;
delete linkProps.to.default;
var linkPropKeys = keys(linkProps);
export var props = _objectSpread({}, linkProps, {}, btnProps); // --- Helper methods ---
// Returns `true` if a tag's name equals `name`

var tagIs = function tagIs(tag, name) {
  return toString(tag).toLowerCase() === toString(name).toLowerCase();
}; // Focus handler for toggle buttons
// Needs class of 'focus' when focused


var handleFocus = function handleFocus(evt) {
  if (evt.type === 'focusin') {
    addClass(evt.target, 'focus');
  } else if (evt.type === 'focusout') {
    removeClass(evt.target, 'focus');
  }
}; // Is the requested button a link?
// If tag prop is set to `a`, we use a <b-link> to get proper disabled handling


var isLink = function isLink(props) {
  return props.href || props.to || tagIs(props.tag, 'a');
}; // Is the button to be a toggle button?


var isToggle = function isToggle(props) {
  return isBoolean(props.pressed);
}; // Is the button "really" a button?


var isButton = function isButton(props) {
  return !(isLink(props) || props.tag && !tagIs(props.tag, 'button'));
}; // Is the requested tag not a button or link?


var isNonStandardTag = function isNonStandardTag(props) {
  return !isLink(props) && !isButton(props);
}; // Compute required classes (non static classes)


var computeClass = function computeClass(props) {
  var _ref;

  return ["btn-".concat(props.variant || getComponentConfig(NAME, 'variant')), (_ref = {}, _defineProperty(_ref, "btn-".concat(props.size), props.size), _defineProperty(_ref, 'btn-block', props.block), _defineProperty(_ref, 'rounded-pill', props.pill), _defineProperty(_ref, 'rounded-0', props.squared && !props.pill), _defineProperty(_ref, "disabled", props.disabled), _defineProperty(_ref, "active", props.pressed), _ref)];
}; // Compute the link props to pass to b-link (if required)


var computeLinkProps = function computeLinkProps(props) {
  return isLink(props) ? pluckProps(linkPropKeys, props) : null;
}; // Compute the attributes for a button


var computeAttrs = function computeAttrs(props, data) {
  var button = isButton(props);
  var link = isLink(props);
  var toggle = isToggle(props);
  var nonStandardTag = isNonStandardTag(props);
  var hashLink = link && props.href === '#';
  var role = data.attrs && data.attrs.role ? data.attrs.role : null;
  var tabindex = data.attrs ? data.attrs.tabindex : null;

  if (nonStandardTag || hashLink) {
    tabindex = '0';
  }

  return {
    // Type only used for "real" buttons
    type: button && !link ? props.type : null,
    // Disabled only set on "real" buttons
    disabled: button ? props.disabled : null,
    // We add a role of button when the tag is not a link or button for ARIA
    // Don't bork any role provided in `data.attrs` when `isLink` or `isButton`
    // Except when link has `href` of `#`
    role: nonStandardTag || hashLink ? 'button' : role,
    // We set the `aria-disabled` state for non-standard tags
    'aria-disabled': nonStandardTag ? String(props.disabled) : null,
    // For toggles, we need to set the pressed state for ARIA
    'aria-pressed': toggle ? String(props.pressed) : null,
    // `autocomplete="off"` is needed in toggle mode to prevent some browsers
    // from remembering the previous setting when using the back button
    autocomplete: toggle ? 'off' : null,
    // `tabindex` is used when the component is not a button
    // Links are tabbable, but don't allow disabled, while non buttons or links
    // are not tabbable, so we mimic that functionality by disabling tabbing
    // when disabled, and adding a `tabindex="0"` to non buttons or non links
    tabindex: props.disabled && !button ? '-1' : tabindex
  };
}; // @vue/component


export var BButton =
/*#__PURE__*/
Vue.extend({
  name: NAME,
  functional: true,
  props: props,
  render: function render(h, _ref2) {
    var props = _ref2.props,
        data = _ref2.data,
        listeners = _ref2.listeners,
        children = _ref2.children;
    var toggle = isToggle(props);
    var link = isLink(props);
    var nonStandardTag = isNonStandardTag(props);
    var hashLink = link && props.href === '#';
    var on = {
      keydown: function keydown(evt) {
        // When the link is a `href="#"` or a non-standard tag (has `role="button"`),
        // we add a keydown handlers for SPACE/ENTER

        /* istanbul ignore next */
        if (props.disabled || !(nonStandardTag || hashLink)) {
          return;
        }

        var keyCode = evt.keyCode; // Add SPACE handler for `href="#"` and ENTER handler for non-standard tags

        if (keyCode === KeyCodes.SPACE || keyCode === KeyCodes.ENTER && nonStandardTag) {
          var target = evt.currentTarget || evt.target;
          evt.preventDefault();
          target.click();
        }
      },
      click: function click(evt) {
        /* istanbul ignore if: blink/button disabled should handle this */
        if (props.disabled && isEvent(evt)) {
          evt.stopPropagation();
          evt.preventDefault();
        } else if (toggle && listeners && listeners['update:pressed']) {
          // Send `.sync` updates to any "pressed" prop (if `.sync` listeners)
          // `concat()` will normalize the value to an array without
          // double wrapping an array value in an array
          concat(listeners['update:pressed']).forEach(function (fn) {
            if (isFunction(fn)) {
              fn(!props.pressed);
            }
          });
        }
      }
    };

    if (toggle) {
      on.focusin = handleFocus;
      on.focusout = handleFocus;
    }

    var componentData = {
      staticClass: 'btn',
      class: computeClass(props),
      props: computeLinkProps(props),
      attrs: computeAttrs(props, data),
      on: on
    };
    return h(link ? BLink : props.tag, mergeData(data, componentData), children);
  }
});