@angular/core
Version:
Angular - the core framework
116 lines • 17 kB
JavaScript
import { TVIEW, T_HOST } from '../interfaces/view';
import { appendProjectedNodes } from '../node_manipulation';
import { getProjectAsAttrValue, isNodeMatchingSelectorList, isSelectorInSelectorList } from '../node_selector_matcher';
import { getLView, setIsNotParent } from '../state';
import { findComponentView } from '../util/view_traversal_utils';
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) {
var wildcardNgContentIndex = null;
var ngProjectAsAttrVal = getProjectAsAttrValue(tNode);
for (var i = 0; i < projectionSlots.length; i++) {
var 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) {
var componentNode = findComponentView(getLView())[T_HOST];
if (!componentNode.projection) {
// If no explicit projection slots are defined, fall back to a single
// projection slot with the wildcard selector.
var numProjectionSlots = projectionSlots ? projectionSlots.length : 1;
var projectionHeads = componentNode.projection =
new Array(numProjectionSlots).fill(null);
var tails = projectionHeads.slice();
var componentChild = componentNode.child;
while (componentChild !== null) {
var 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;
}
}
}
var delayProjection = false;
export function setDelayProjection(value) {
delayProjection = value;
}
/**
* 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, attrs) {
if (selectorIndex === void 0) { selectorIndex = 0; }
var lView = getLView();
var tProjectionNode = getOrCreateTNode(lView[TVIEW], lView[T_HOST], nodeIndex, 1 /* 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
setIsNotParent();
// We might need to delay the projection of nodes if they are in the middle of an i18n block
if (!delayProjection) {
// re-distribution of projectable nodes is stored on a component's view level
appendProjectedNodes(lView, tProjectionNode, selectorIndex, findComponentView(lView));
}
}
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All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\nimport {TAttributes, TElementNode, TNode, TNodeType} from '../interfaces/node';\nimport {ProjectionSlots} from '../interfaces/projection';\nimport {TVIEW, T_HOST} from '../interfaces/view';\nimport {appendProjectedNodes} from '../node_manipulation';\nimport {getProjectAsAttrValue, isNodeMatchingSelectorList, isSelectorInSelectorList} from '../node_selector_matcher';\nimport {getLView, setIsNotParent} from '../state';\nimport {findComponentView} from '../util/view_traversal_utils';\nimport {getOrCreateTNode} from './shared';\n\n\n/**\n * Checks a given node against matching projection slots and returns the\n * determined slot index. 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 = findComponentView(getLView())[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        new Array(numProjectionSlots).fill(null);\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\nlet delayProjection = false;\nexport function setDelayProjection(value: boolean) {\n  delayProjection = value;\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 tProjectionNode = getOrCreateTNode(\n      lView[TVIEW], lView[T_HOST], 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  setIsNotParent();\n\n  // We might need to delay the projection of nodes if they are in the middle of an i18n block\n  if (!delayProjection) {\n    // re-distribution of projectable nodes is stored on a component's view level\n    appendProjectedNodes(lView, tProjectionNode, selectorIndex, findComponentView(lView));\n  }\n}\n"]}