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refactor(ivy): simplify logic of projectable nodes insertion (#29008) 

This commit removes code duplication around projectables nodes insertion.
It also simplfy the overall logic by using recursive function calls instead
of hand-unrolled stack (we can always optimise this part if needed).

PR Close #29008
This commit is contained in:
Pawel Kozlowski 2019-02-27 12:18:23 +01:00 committed by Andrew Kushnir
parent efa10e33a9
commit 91a161aa13
2 changed files with 39 additions and 57 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

57
packages/core/src/render3/instructions.ts
View File

@ -37,7 +37,7 @@ import {SanitizerFn} from './interfaces/sanitization';
import {StylingContext} from './interfaces/styling';
import {BINDING_INDEX, CHILD_HEAD, CHILD_TAIL, CLEANUP, CONTEXT, DECLARATION_VIEW, ExpandoInstructions, FLAGS, HEADER_OFFSET, HOST, INJECTOR, InitPhaseState, LView, LViewFlags, NEXT, OpaqueViewState, PARENT, QUERIES, RENDERER, RENDERER_FACTORY, RootContext, RootContextFlags, SANITIZER, TData, TVIEW, TView, T_HOST} from './interfaces/view';
import {assertNodeOfPossibleTypes, assertNodeType} from './node_assert';
import {appendChild, appendProjectedNode, createTextNode, insertView, removeView} from './node_manipulation';
import {appendChild, appendProjectedNodes, createTextNode, insertView, removeView} from './node_manipulation';
import {isNodeMatchingSelectorList, matchingSelectorIndex} from './node_selector_matcher';
import {applyOnCreateInstructions} from './node_util';
import {decreaseElementDepthCount, enterView, getBindingsEnabled, getCheckNoChangesMode, getContextLView, getCurrentDirectiveDef, getElementDepthCount, getIsParent, getLView, getPreviousOrParentTNode, increaseElementDepthCount, isCreationMode, leaveView, nextContextImpl, resetComponentState, setBindingRoot, setCheckNoChangesMode, setCurrentDirectiveDef, setCurrentQueryIndex, setIsParent, setPreviousOrParentTNode} from './state';
@ -2625,14 +2625,6 @@ export function projectionDef(selectors?: CssSelectorList[], textSelectors?: str
}
}
/**
* Stack used to keep track of projection nodes in projection() instruction.
*
* This is deliberately created outside of projection() to avoid allocating
* a new array each time the function is called. Instead the array will be
* re-used by each invocation. This works because the function is not reentrant.
*/
const projectionNodeStack: (LView | TNode)[] = [];
/**
* Inserts previously re-distributed projected nodes. This instruction must be preceded by a call
@ -2655,52 +2647,7 @@ export function projection(nodeIndex: number, selectorIndex: number = 0, attrs?:
setIsParent(false);
// re-distribution of projectable nodes is stored on a component's view level
const componentView = findComponentView(lView);
const componentNode = componentView[T_HOST] as TElementNode;
let nodeToProject = (componentNode.projection as(TNode | null)[])[selectorIndex];
let projectedView = componentView[PARENT] !as LView;
ngDevMode && assertLView(projectedView);
let projectionNodeIndex = -1;
if (Array.isArray(nodeToProject)) {
appendChild(nodeToProject, tProjectionNode, lView);
} else {
while (nodeToProject) {
if (nodeToProject.type === TNodeType.Projection) {
// This node is re-projected, so we must go up the tree to get its projected nodes.
const currentComponentView = findComponentView(projectedView);
const currentComponentHost = currentComponentView[T_HOST] as TElementNode;
const firstProjectedNode = (currentComponentHost.projection as(
TNode | null)[])[nodeToProject.projection as number];
if (firstProjectedNode) {
if (Array.isArray(firstProjectedNode)) {
appendChild(firstProjectedNode, tProjectionNode, lView);
} else {
projectionNodeStack[++projectionNodeIndex] = nodeToProject;
projectionNodeStack[++projectionNodeIndex] = projectedView;
nodeToProject = firstProjectedNode;
projectedView = getLViewParent(currentComponentView) !;
continue;
}
}
} else {
// This flag must be set now or we won't know that this node is projected
// if the nodes are inserted into a container later.
nodeToProject.flags |= TNodeFlags.isProjected;
appendProjectedNode(nodeToProject, tProjectionNode, lView, projectedView);
}
// If we are finished with a list of re-projected nodes, we need to get
// back to the root projection node that was re-projected.
if (nodeToProject.next === null && projectedView !== componentView[PARENT] !) {
projectedView = projectionNodeStack[projectionNodeIndex--] as LView;
nodeToProject = projectionNodeStack[projectionNodeIndex--] as TNode;
}
nodeToProject = nodeToProject.next;
}
}
appendProjectedNodes(lView, tProjectionNode, selectorIndex, findComponentView(lView));
}
/**

39
packages/core/src/render3/node_manipulation.ts
View File

@ -14,7 +14,7 @@ import {attachPatchData} from './context_discovery';
import {LContainer, NATIVE, VIEWS, unusedValueExportToPlacateAjd as unused1} from './interfaces/container';
import {ComponentDef} from './interfaces/definition';
import {NodeInjectorFactory} from './interfaces/injector';
import {TElementNode, TNode, TNodeFlags, TNodeType, TViewNode, unusedValueExportToPlacateAjd as unused2} from './interfaces/node';
import {TElementNode, TNode, TNodeFlags, TNodeType, TProjectionNode, TViewNode, unusedValueExportToPlacateAjd as unused2} from './interfaces/node';
import {unusedValueExportToPlacateAjd as unused3} from './interfaces/projection';
import {ProceduralRenderer3, RComment, RElement, RNode, RText, Renderer3, isProceduralRenderer, unusedValueExportToPlacateAjd as unused4} from './interfaces/renderer';
import {CHILD_HEAD, CLEANUP, FLAGS, HEADER_OFFSET, HookData, LView, LViewFlags, NEXT, PARENT, QUERIES, RENDERER, TVIEW, T_HOST, unusedValueExportToPlacateAjd as unused5} from './interfaces/view';
@ -717,6 +717,41 @@ export function nativeRemoveNode(renderer: Renderer3, rNode: RNode, isHostElemen
}
}
/**
* Appends nodes to a target projection place. Nodes to insert were previously re-distribution and
* stored on a component host level.
* @param lView A LView where nodes are inserted (target VLview)
* @param tProjectionNode A projection node where previously re-distribution should be appended
* (target insertion place)
* @param selectorIndex A bucket from where nodes to project should be taken
* @param componentView A where projectable nodes were initially created (source view)
*/
export function appendProjectedNodes(
lView: LView, tProjectionNode: TProjectionNode, selectorIndex: number,
componentView: LView): void {
const projectedView = componentView[PARENT] !as LView;
const componentNode = componentView[T_HOST] as TElementNode;
let nodeToProject = (componentNode.projection as(TNode | null)[])[selectorIndex];
if (Array.isArray(nodeToProject)) {
appendChild(nodeToProject, tProjectionNode, lView);
} else {
while (nodeToProject) {
if (nodeToProject.type === TNodeType.Projection) {
appendProjectedNodes(
lView, tProjectionNode, (nodeToProject as TProjectionNode).projection,
findComponentView(projectedView));
} else {
// This flag must be set now or we won't know that this node is projected
// if the nodes are inserted into a container later.
nodeToProject.flags |= TNodeFlags.isProjected;
appendProjectedNode(nodeToProject, tProjectionNode, lView, projectedView);
}
nodeToProject = nodeToProject.next;
}
}
}
/**
* Appends a projected node to the DOM, or in the case of a projected container,
* appends the nodes from all of the container's active views to the DOM.
@ -726,7 +761,7 @@ export function nativeRemoveNode(renderer: Renderer3, rNode: RNode, isHostElemen
* @param currentView Current LView
* @param projectionView Projection view (view above current)
*/
export function appendProjectedNode(
function appendProjectedNode(
projectedTNode: TNode, tProjectionNode: TNode, currentView: LView,
projectionView: LView): void {
const native = getNativeByTNode(projectedTNode, projectionView);