function processSlotContent()

in assets/js/vue.js [10108:10225]
105 lines of code
26 McCabe index (conditional complexity)

  function processSlotContent (el) {
    var slotScope;
    if (el.tag === 'template') {
      slotScope = getAndRemoveAttr(el, 'scope');
      /* istanbul ignore if */
      if (slotScope) {
        warn$2(
          "the \"scope\" attribute for scoped slots have been deprecated and " +
          "replaced by \"slot-scope\" since 2.5. The new \"slot-scope\" attribute " +
          "can also be used on plain elements in addition to <template> to " +
          "denote scoped slots.",
          el.rawAttrsMap['scope'],
          true
        );
      }
      el.slotScope = slotScope || getAndRemoveAttr(el, 'slot-scope');
    } else if ((slotScope = getAndRemoveAttr(el, 'slot-scope'))) {
      /* istanbul ignore if */
      if (el.attrsMap['v-for']) {
        warn$2(
          "Ambiguous combined usage of slot-scope and v-for on <" + (el.tag) + "> " +
          "(v-for takes higher priority). Use a wrapper <template> for the " +
          "scoped slot to make it clearer.",
          el.rawAttrsMap['slot-scope'],
          true
        );
      }
      el.slotScope = slotScope;
    }

    // slot="xxx"
    var slotTarget = getBindingAttr(el, 'slot');
    if (slotTarget) {
      el.slotTarget = slotTarget === '""' ? '"default"' : slotTarget;
      el.slotTargetDynamic = !!(el.attrsMap[':slot'] || el.attrsMap['v-bind:slot']);
      // preserve slot as an attribute for native shadow DOM compat
      // only for non-scoped slots.
      if (el.tag !== 'template' && !el.slotScope) {
        addAttr(el, 'slot', slotTarget, getRawBindingAttr(el, 'slot'));
      }
    }

    // 2.6 v-slot syntax
    {
      if (el.tag === 'template') {
        // v-slot on <template>
        var slotBinding = getAndRemoveAttrByRegex(el, slotRE);
        if (slotBinding) {
          {
            if (el.slotTarget || el.slotScope) {
              warn$2(
                "Unexpected mixed usage of different slot syntaxes.",
                el
              );
            }
            if (el.parent && !maybeComponent(el.parent)) {
              warn$2(
                "<template v-slot> can only appear at the root level inside " +
                "the receiving component",
                el
              );
            }
          }
          var ref = getSlotName(slotBinding);
          var name = ref.name;
          var dynamic = ref.dynamic;
          el.slotTarget = name;
          el.slotTargetDynamic = dynamic;
          el.slotScope = slotBinding.value || emptySlotScopeToken; // force it into a scoped slot for perf
        }
      } else {
        // v-slot on component, denotes default slot
        var slotBinding$1 = getAndRemoveAttrByRegex(el, slotRE);
        if (slotBinding$1) {
          {
            if (!maybeComponent(el)) {
              warn$2(
                "v-slot can only be used on components or <template>.",
                slotBinding$1
              );
            }
            if (el.slotScope || el.slotTarget) {
              warn$2(
                "Unexpected mixed usage of different slot syntaxes.",
                el
              );
            }
            if (el.scopedSlots) {
              warn$2(
                "To avoid scope ambiguity, the default slot should also use " +
                "<template> syntax when there are other named slots.",
                slotBinding$1
              );
            }
          }
          // add the component's children to its default slot
          var slots = el.scopedSlots || (el.scopedSlots = {});
          var ref$1 = getSlotName(slotBinding$1);
          var name$1 = ref$1.name;
          var dynamic$1 = ref$1.dynamic;
          var slotContainer = slots[name$1] = createASTElement('template', [], el);
          slotContainer.slotTarget = name$1;
          slotContainer.slotTargetDynamic = dynamic$1;
          slotContainer.children = el.children.filter(function (c) {
            if (!c.slotScope) {
              c.parent = slotContainer;
              return true
            }
          });
          slotContainer.slotScope = slotBinding$1.value || emptySlotScopeToken;
          // remove children as they are returned from scopedSlots now
          el.children = [];
          // mark el non-plain so data gets generated
          el.plain = false;
        }
      }
    }
  }