/**
 * @license
 * Copyright Google LLC All Rights Reserved.
 *
 * Use of this source code is governed by an MIT-style license that can be
 * found in the LICENSE file at https://angular.io/license
 */
import { newArray } from '../../util/array_utils';
import { DECLARATION_COMPONENT_VIEW, HEADER_OFFSET, T_HOST } from '../interfaces/view';
import { applyProjection } from '../node_manipulation';
import { getProjectAsAttrValue, isNodeMatchingSelectorList, isSelectorInSelectorList } from '../node_selector_matcher';
import { getLView, getTView, setCurrentTNodeAsNotParent } from '../state';
import { getOrCreateTNode } from './shared';
/**
 * Checks a given node against matching projection slots and returns the
 * determined slot index. Returns "null" if no slot matched the given node.
 *
 * This function takes into account the parsed ngProjectAs selector from the
 * node's attributes. If present, it will check whether the ngProjectAs selector
 * matches any of the projection slot selectors.
 */
export function matchingProjectionSlotIndex(tNode, projectionSlots) {
    let wildcardNgContentIndex = null;
    const ngProjectAsAttrVal = getProjectAsAttrValue(tNode);
    for (let i = 0; i < projectionSlots.length; i++) {
        const slotValue = projectionSlots[i];
        // The last wildcard projection slot should match all nodes which aren't matching
        // any selector. This is necessary to be backwards compatible with view engine.
        if (slotValue === '*') {
            wildcardNgContentIndex = i;
            continue;
        }
        // If we ran into an `ngProjectAs` attribute, we should match its parsed selector
        // to the list of selectors, otherwise we fall back to matching against the node.
        if (ngProjectAsAttrVal === null ?
            isNodeMatchingSelectorList(tNode, slotValue, /* isProjectionMode */ true) :
            isSelectorInSelectorList(ngProjectAsAttrVal, slotValue)) {
            return i; // first matching selector "captures" a given node
        }
    }
    return wildcardNgContentIndex;
}
/**
 * Instruction to distribute projectable nodes among <ng-content> occurrences in a given template.
 * It takes all the selectors from the entire component's template and decides where
 * each projected node belongs (it re-distributes nodes among "buckets" where each "bucket" is
 * backed by a selector).
 *
 * This function requires CSS selectors to be provided in 2 forms: parsed (by a compiler) and text,
 * un-parsed form.
 *
 * The parsed form is needed for efficient matching of a node against a given CSS selector.
 * The un-parsed, textual form is needed for support of the ngProjectAs attribute.
 *
 * Having a CSS selector in 2 different formats is not ideal, but alternatives have even more
 * drawbacks:
 * - having only a textual form would require runtime parsing of CSS selectors;
 * - we can't have only a parsed as we can't re-construct textual form from it (as entered by a
 * template author).
 *
 * @param projectionSlots? A collection of projection slots. A projection slot can be based
 *        on a parsed CSS selectors or set to the wildcard selector ("*") in order to match
 *        all nodes which do not match any selector. If not specified, a single wildcard
 *        selector projection slot will be defined.
 *
 * @codeGenApi
 */
export function ɵɵprojectionDef(projectionSlots) {
    const componentNode = getLView()[DECLARATION_COMPONENT_VIEW][T_HOST];
    if (!componentNode.projection) {
        // If no explicit projection slots are defined, fall back to a single
        // projection slot with the wildcard selector.
        const numProjectionSlots = projectionSlots ? projectionSlots.length : 1;
        const projectionHeads = componentNode.projection =
            newArray(numProjectionSlots, null);
        const tails = projectionHeads.slice();
        let componentChild = componentNode.child;
        while (componentChild !== null) {
            const slotIndex = projectionSlots ? matchingProjectionSlotIndex(componentChild, projectionSlots) : 0;
            if (slotIndex !== null) {
                if (tails[slotIndex]) {
                    tails[slotIndex].projectionNext = componentChild;
                }
                else {
                    projectionHeads[slotIndex] = componentChild;
                }
                tails[slotIndex] = componentChild;
            }
            componentChild = componentChild.next;
        }
    }
}
/**
 * Inserts previously re-distributed projected nodes. This instruction must be preceded by a call
 * to the projectionDef instruction.
 *
 * @param nodeIndex
 * @param selectorIndex:
 *        - 0 when the selector is `*` (or unspecified as this is the default value),
 *        - 1 based index of the selector from the {@link projectionDef}
 *
 * @codeGenApi
 */
export function ɵɵprojection(nodeIndex, selectorIndex = 0, attrs) {
    const lView = getLView();
    const tView = getTView();
    const tProjectionNode = getOrCreateTNode(tView, HEADER_OFFSET + nodeIndex, 16 /* TNodeType.Projection */, null, attrs || null);
    // We can't use viewData[HOST_NODE] because projection nodes can be nested in embedded views.
    if (tProjectionNode.projection === null)
        tProjectionNode.projection = selectorIndex;
    // `<ng-content>` has no content
    setCurrentTNodeAsNotParent();
    if ((tProjectionNode.flags & 64 /* TNodeFlags.isDetached */) !== 64 /* TNodeFlags.isDetached */) {
        // re-distribution of projectable nodes is stored on a component's view level
        applyProjection(tView, lView, tProjectionNode);
    }
}
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Returns \"null\" if no slot matched the given node.\n *\n * This function takes into account the parsed ngProjectAs selector from the\n * node's attributes. If present, it will check whether the ngProjectAs selector\n * matches any of the projection slot selectors.\n */\nexport function matchingProjectionSlotIndex(tNode: TNode, projectionSlots: ProjectionSlots): number|\n    null {\n  let wildcardNgContentIndex = null;\n  const ngProjectAsAttrVal = getProjectAsAttrValue(tNode);\n  for (let i = 0; i < projectionSlots.length; i++) {\n    const slotValue = projectionSlots[i];\n    // The last wildcard projection slot should match all nodes which aren't matching\n    // any selector. This is necessary to be backwards compatible with view engine.\n    if (slotValue === '*') {\n      wildcardNgContentIndex = i;\n      continue;\n    }\n    // If we ran into an `ngProjectAs` attribute, we should match its parsed selector\n    // to the list of selectors, otherwise we fall back to matching against the node.\n    if (ngProjectAsAttrVal === null ?\n            isNodeMatchingSelectorList(tNode, slotValue, /* isProjectionMode */ true) :\n            isSelectorInSelectorList(ngProjectAsAttrVal, slotValue)) {\n      return i;  // first matching selector \"captures\" a given node\n    }\n  }\n  return wildcardNgContentIndex;\n}\n\n/**\n * Instruction to distribute projectable nodes among <ng-content> occurrences in a given template.\n * It takes all the selectors from the entire component's template and decides where\n * each projected node belongs (it re-distributes nodes among \"buckets\" where each \"bucket\" is\n * backed by a selector).\n *\n * This function requires CSS selectors to be provided in 2 forms: parsed (by a compiler) and text,\n * un-parsed form.\n *\n * The parsed form is needed for efficient matching of a node against a given CSS selector.\n * The un-parsed, textual form is needed for support of the ngProjectAs attribute.\n *\n * Having a CSS selector in 2 different formats is not ideal, but alternatives have even more\n * drawbacks:\n * - having only a textual form would require runtime parsing of CSS selectors;\n * - we can't have only a parsed as we can't re-construct textual form from it (as entered by a\n * template author).\n *\n * @param projectionSlots? A collection of projection slots. A projection slot can be based\n *        on a parsed CSS selectors or set to the wildcard selector (\"*\") in order to match\n *        all nodes which do not match any selector. If not specified, a single wildcard\n *        selector projection slot will be defined.\n *\n * @codeGenApi\n */\nexport function ɵɵprojectionDef(projectionSlots?: ProjectionSlots): void {\n  const componentNode = getLView()[DECLARATION_COMPONENT_VIEW][T_HOST] as TElementNode;\n\n  if (!componentNode.projection) {\n    // If no explicit projection slots are defined, fall back to a single\n    // projection slot with the wildcard selector.\n    const numProjectionSlots = projectionSlots ? projectionSlots.length : 1;\n    const projectionHeads: (TNode|null)[] = componentNode.projection =\n        newArray(numProjectionSlots, null! as TNode);\n    const tails: (TNode|null)[] = projectionHeads.slice();\n\n    let componentChild: TNode|null = componentNode.child;\n\n    while (componentChild !== null) {\n      const slotIndex =\n          projectionSlots ? matchingProjectionSlotIndex(componentChild, projectionSlots) : 0;\n\n      if (slotIndex !== null) {\n        if (tails[slotIndex]) {\n          tails[slotIndex]!.projectionNext = componentChild;\n        } else {\n          projectionHeads[slotIndex] = componentChild;\n        }\n        tails[slotIndex] = componentChild;\n      }\n\n      componentChild = componentChild.next;\n    }\n  }\n}\n\n\n/**\n * Inserts previously re-distributed projected nodes. This instruction must be preceded by a call\n * to the projectionDef instruction.\n *\n * @param nodeIndex\n * @param selectorIndex:\n *        - 0 when the selector is `*` (or unspecified as this is the default value),\n *        - 1 based index of the selector from the {@link projectionDef}\n *\n * @codeGenApi\n */\nexport function ɵɵprojection(\n    nodeIndex: number, selectorIndex: number = 0, attrs?: TAttributes): void {\n  const lView = getLView();\n  const tView = getTView();\n  const tProjectionNode =\n      getOrCreateTNode(tView, HEADER_OFFSET + nodeIndex, TNodeType.Projection, null, attrs || null);\n\n  // We can't use viewData[HOST_NODE] because projection nodes can be nested in embedded views.\n  if (tProjectionNode.projection === null) tProjectionNode.projection = selectorIndex;\n\n  // `<ng-content>` has no content\n  setCurrentTNodeAsNotParent();\n\n  if ((tProjectionNode.flags & TNodeFlags.isDetached) !== TNodeFlags.isDetached) {\n    // re-distribution of projectable nodes is stored on a component's view level\n    applyProjection(tView, lView, tProjectionNode);\n  }\n}\n"]}