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pure_function.ts
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pure_function.ts
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/**
* @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 {assertIndexInRange} from '../util/assert';
import {
bindingUpdated,
bindingUpdated2,
bindingUpdated3,
bindingUpdated4,
getBinding,
updateBinding,
} from './bindings';
import {LView} from './interfaces/view';
import {getBindingRoot, getLView} from './state';
import {NO_CHANGE} from './tokens';
/**
* Bindings for pure functions are stored after regular bindings.
*
* |-------decls------|---------vars---------| |----- hostVars (dir1) ------|
* ------------------------------------------------------------------------------------------
* | nodes/refs/pipes | bindings | fn slots | injector | dir1 | host bindings | host slots |
* ------------------------------------------------------------------------------------------
* ^ ^
* TView.bindingStartIndex TView.expandoStartIndex
*
* Pure function instructions are given an offset from the binding root. Adding the offset to the
* binding root gives the first index where the bindings are stored. In component views, the binding
* root is the bindingStartIndex. In host bindings, the binding root is the expandoStartIndex +
* any directive instances + any hostVars in directives evaluated before it.
*
* See VIEW_DATA.md for more information about host binding resolution.
*/
/**
* If the value hasn't been saved, calls the pure function to store and return the
* value. If it has been saved, returns the saved value.
*
* @param slotOffset the offset from binding root to the reserved slot
* @param pureFn Function that returns a value
* @param thisArg Optional calling context of pureFn
* @returns value
*
* @codeGenApi
*/
export function ɵɵpureFunction0<T>(slotOffset: number, pureFn: () => T, thisArg?: any): T {
const bindingIndex = getBindingRoot() + slotOffset;
const lView = getLView();
return lView[bindingIndex] === NO_CHANGE
? updateBinding(lView, bindingIndex, thisArg ? pureFn.call(thisArg) : pureFn())
: getBinding(lView, bindingIndex);
}
/**
* If the value of the provided exp has changed, calls the pure function to return
* an updated value. Or if the value has not changed, returns cached value.
*
* @param slotOffset the offset from binding root to the reserved slot
* @param pureFn Function that returns an updated value
* @param exp Updated expression value
* @param thisArg Optional calling context of pureFn
* @returns Updated or cached value
*
* @codeGenApi
*/
export function ɵɵpureFunction1(
slotOffset: number,
pureFn: (v: any) => any,
exp: any,
thisArg?: any,
): any {
return pureFunction1Internal(getLView(), getBindingRoot(), slotOffset, pureFn, exp, thisArg);
}
/**
* If the value of any provided exp has changed, calls the pure function to return
* an updated value. Or if no values have changed, returns cached value.
*
* @param slotOffset the offset from binding root to the reserved slot
* @param pureFn
* @param exp1
* @param exp2
* @param thisArg Optional calling context of pureFn
* @returns Updated or cached value
*
* @codeGenApi
*/
export function ɵɵpureFunction2(
slotOffset: number,
pureFn: (v1: any, v2: any) => any,
exp1: any,
exp2: any,
thisArg?: any,
): any {
return pureFunction2Internal(
getLView(),
getBindingRoot(),
slotOffset,
pureFn,
exp1,
exp2,
thisArg,
);
}
/**
* If the value of any provided exp has changed, calls the pure function to return
* an updated value. Or if no values have changed, returns cached value.
*
* @param slotOffset the offset from binding root to the reserved slot
* @param pureFn
* @param exp1
* @param exp2
* @param exp3
* @param thisArg Optional calling context of pureFn
* @returns Updated or cached value
*
* @codeGenApi
*/
export function ɵɵpureFunction3(
slotOffset: number,
pureFn: (v1: any, v2: any, v3: any) => any,
exp1: any,
exp2: any,
exp3: any,
thisArg?: any,
): any {
return pureFunction3Internal(
getLView(),
getBindingRoot(),
slotOffset,
pureFn,
exp1,
exp2,
exp3,
thisArg,
);
}
/**
* If the value of any provided exp has changed, calls the pure function to return
* an updated value. Or if no values have changed, returns cached value.
*
* @param slotOffset the offset from binding root to the reserved slot
* @param pureFn
* @param exp1
* @param exp2
* @param exp3
* @param exp4
* @param thisArg Optional calling context of pureFn
* @returns Updated or cached value
*
* @codeGenApi
*/
export function ɵɵpureFunction4(
slotOffset: number,
pureFn: (v1: any, v2: any, v3: any, v4: any) => any,
exp1: any,
exp2: any,
exp3: any,
exp4: any,
thisArg?: any,
): any {
return pureFunction4Internal(
getLView(),
getBindingRoot(),
slotOffset,
pureFn,
exp1,
exp2,
exp3,
exp4,
thisArg,
);
}
/**
* If the value of any provided exp has changed, calls the pure function to return
* an updated value. Or if no values have changed, returns cached value.
*
* @param slotOffset the offset from binding root to the reserved slot
* @param pureFn
* @param exp1
* @param exp2
* @param exp3
* @param exp4
* @param exp5
* @param thisArg Optional calling context of pureFn
* @returns Updated or cached value
*
* @codeGenApi
*/
export function ɵɵpureFunction5(
slotOffset: number,
pureFn: (v1: any, v2: any, v3: any, v4: any, v5: any) => any,
exp1: any,
exp2: any,
exp3: any,
exp4: any,
exp5: any,
thisArg?: any,
): any {
const bindingIndex = getBindingRoot() + slotOffset;
const lView = getLView();
const different = bindingUpdated4(lView, bindingIndex, exp1, exp2, exp3, exp4);
return bindingUpdated(lView, bindingIndex + 4, exp5) || different
? updateBinding(
lView,
bindingIndex + 5,
thisArg
? pureFn.call(thisArg, exp1, exp2, exp3, exp4, exp5)
: pureFn(exp1, exp2, exp3, exp4, exp5),
)
: getBinding(lView, bindingIndex + 5);
}
/**
* If the value of any provided exp has changed, calls the pure function to return
* an updated value. Or if no values have changed, returns cached value.
*
* @param slotOffset the offset from binding root to the reserved slot
* @param pureFn
* @param exp1
* @param exp2
* @param exp3
* @param exp4
* @param exp5
* @param exp6
* @param thisArg Optional calling context of pureFn
* @returns Updated or cached value
*
* @codeGenApi
*/
export function ɵɵpureFunction6(
slotOffset: number,
pureFn: (v1: any, v2: any, v3: any, v4: any, v5: any, v6: any) => any,
exp1: any,
exp2: any,
exp3: any,
exp4: any,
exp5: any,
exp6: any,
thisArg?: any,
): any {
const bindingIndex = getBindingRoot() + slotOffset;
const lView = getLView();
const different = bindingUpdated4(lView, bindingIndex, exp1, exp2, exp3, exp4);
return bindingUpdated2(lView, bindingIndex + 4, exp5, exp6) || different
? updateBinding(
lView,
bindingIndex + 6,
thisArg
? pureFn.call(thisArg, exp1, exp2, exp3, exp4, exp5, exp6)
: pureFn(exp1, exp2, exp3, exp4, exp5, exp6),
)
: getBinding(lView, bindingIndex + 6);
}
/**
* If the value of any provided exp has changed, calls the pure function to return
* an updated value. Or if no values have changed, returns cached value.
*
* @param slotOffset the offset from binding root to the reserved slot
* @param pureFn
* @param exp1
* @param exp2
* @param exp3
* @param exp4
* @param exp5
* @param exp6
* @param exp7
* @param thisArg Optional calling context of pureFn
* @returns Updated or cached value
*
* @codeGenApi
*/
export function ɵɵpureFunction7(
slotOffset: number,
pureFn: (v1: any, v2: any, v3: any, v4: any, v5: any, v6: any, v7: any) => any,
exp1: any,
exp2: any,
exp3: any,
exp4: any,
exp5: any,
exp6: any,
exp7: any,
thisArg?: any,
): any {
const bindingIndex = getBindingRoot() + slotOffset;
const lView = getLView();
let different = bindingUpdated4(lView, bindingIndex, exp1, exp2, exp3, exp4);
return bindingUpdated3(lView, bindingIndex + 4, exp5, exp6, exp7) || different
? updateBinding(
lView,
bindingIndex + 7,
thisArg
? pureFn.call(thisArg, exp1, exp2, exp3, exp4, exp5, exp6, exp7)
: pureFn(exp1, exp2, exp3, exp4, exp5, exp6, exp7),
)
: getBinding(lView, bindingIndex + 7);
}
/**
* If the value of any provided exp has changed, calls the pure function to return
* an updated value. Or if no values have changed, returns cached value.
*
* @param slotOffset the offset from binding root to the reserved slot
* @param pureFn
* @param exp1
* @param exp2
* @param exp3
* @param exp4
* @param exp5
* @param exp6
* @param exp7
* @param exp8
* @param thisArg Optional calling context of pureFn
* @returns Updated or cached value
*
* @codeGenApi
*/
export function ɵɵpureFunction8(
slotOffset: number,
pureFn: (v1: any, v2: any, v3: any, v4: any, v5: any, v6: any, v7: any, v8: any) => any,
exp1: any,
exp2: any,
exp3: any,
exp4: any,
exp5: any,
exp6: any,
exp7: any,
exp8: any,
thisArg?: any,
): any {
const bindingIndex = getBindingRoot() + slotOffset;
const lView = getLView();
const different = bindingUpdated4(lView, bindingIndex, exp1, exp2, exp3, exp4);
return bindingUpdated4(lView, bindingIndex + 4, exp5, exp6, exp7, exp8) || different
? updateBinding(
lView,
bindingIndex + 8,
thisArg
? pureFn.call(thisArg, exp1, exp2, exp3, exp4, exp5, exp6, exp7, exp8)
: pureFn(exp1, exp2, exp3, exp4, exp5, exp6, exp7, exp8),
)
: getBinding(lView, bindingIndex + 8);
}
/**
* pureFunction instruction that can support any number of bindings.
*
* If the value of any provided exp has changed, calls the pure function to return
* an updated value. Or if no values have changed, returns cached value.
*
* @param slotOffset the offset from binding root to the reserved slot
* @param pureFn A pure function that takes binding values and builds an object or array
* containing those values.
* @param exps An array of binding values
* @param thisArg Optional calling context of pureFn
* @returns Updated or cached value
*
* @codeGenApi
*/
export function ɵɵpureFunctionV(
slotOffset: number,
pureFn: (...v: any[]) => any,
exps: any[],
thisArg?: any,
): any {
return pureFunctionVInternal(getLView(), getBindingRoot(), slotOffset, pureFn, exps, thisArg);
}
/**
* Results of a pure function invocation are stored in LView in a dedicated slot that is initialized
* to NO_CHANGE. In rare situations a pure pipe might throw an exception on the very first
* invocation and not produce any valid results. In this case LView would keep holding the NO_CHANGE
* value. The NO_CHANGE is not something that we can use in expressions / bindings thus we convert
* it to `undefined`.
*/
function getPureFunctionReturnValue(lView: LView, returnValueIndex: number) {
ngDevMode && assertIndexInRange(lView, returnValueIndex);
const lastReturnValue = lView[returnValueIndex];
return lastReturnValue === NO_CHANGE ? undefined : lastReturnValue;
}
/**
* If the value of the provided exp has changed, calls the pure function to return
* an updated value. Or if the value has not changed, returns cached value.
*
* @param lView LView in which the function is being executed.
* @param bindingRoot Binding root index.
* @param slotOffset the offset from binding root to the reserved slot
* @param pureFn Function that returns an updated value
* @param exp Updated expression value
* @param thisArg Optional calling context of pureFn
* @returns Updated or cached value
*/
export function pureFunction1Internal(
lView: LView,
bindingRoot: number,
slotOffset: number,
pureFn: (v: any) => any,
exp: any,
thisArg?: any,
): any {
const bindingIndex = bindingRoot + slotOffset;
return bindingUpdated(lView, bindingIndex, exp)
? updateBinding(lView, bindingIndex + 1, thisArg ? pureFn.call(thisArg, exp) : pureFn(exp))
: getPureFunctionReturnValue(lView, bindingIndex + 1);
}
/**
* If the value of any provided exp has changed, calls the pure function to return
* an updated value. Or if no values have changed, returns cached value.
*
* @param lView LView in which the function is being executed.
* @param bindingRoot Binding root index.
* @param slotOffset the offset from binding root to the reserved slot
* @param pureFn
* @param exp1
* @param exp2
* @param thisArg Optional calling context of pureFn
* @returns Updated or cached value
*/
export function pureFunction2Internal(
lView: LView,
bindingRoot: number,
slotOffset: number,
pureFn: (v1: any, v2: any) => any,
exp1: any,
exp2: any,
thisArg?: any,
): any {
const bindingIndex = bindingRoot + slotOffset;
return bindingUpdated2(lView, bindingIndex, exp1, exp2)
? updateBinding(
lView,
bindingIndex + 2,
thisArg ? pureFn.call(thisArg, exp1, exp2) : pureFn(exp1, exp2),
)
: getPureFunctionReturnValue(lView, bindingIndex + 2);
}
/**
* If the value of any provided exp has changed, calls the pure function to return
* an updated value. Or if no values have changed, returns cached value.
*
* @param lView LView in which the function is being executed.
* @param bindingRoot Binding root index.
* @param slotOffset the offset from binding root to the reserved slot
* @param pureFn
* @param exp1
* @param exp2
* @param exp3
* @param thisArg Optional calling context of pureFn
* @returns Updated or cached value
*/
export function pureFunction3Internal(
lView: LView,
bindingRoot: number,
slotOffset: number,
pureFn: (v1: any, v2: any, v3: any) => any,
exp1: any,
exp2: any,
exp3: any,
thisArg?: any,
): any {
const bindingIndex = bindingRoot + slotOffset;
return bindingUpdated3(lView, bindingIndex, exp1, exp2, exp3)
? updateBinding(
lView,
bindingIndex + 3,
thisArg ? pureFn.call(thisArg, exp1, exp2, exp3) : pureFn(exp1, exp2, exp3),
)
: getPureFunctionReturnValue(lView, bindingIndex + 3);
}
/**
* If the value of any provided exp has changed, calls the pure function to return
* an updated value. Or if no values have changed, returns cached value.
*
* @param lView LView in which the function is being executed.
* @param bindingRoot Binding root index.
* @param slotOffset the offset from binding root to the reserved slot
* @param pureFn
* @param exp1
* @param exp2
* @param exp3
* @param exp4
* @param thisArg Optional calling context of pureFn
* @returns Updated or cached value
*
*/
export function pureFunction4Internal(
lView: LView,
bindingRoot: number,
slotOffset: number,
pureFn: (v1: any, v2: any, v3: any, v4: any) => any,
exp1: any,
exp2: any,
exp3: any,
exp4: any,
thisArg?: any,
): any {
const bindingIndex = bindingRoot + slotOffset;
return bindingUpdated4(lView, bindingIndex, exp1, exp2, exp3, exp4)
? updateBinding(
lView,
bindingIndex + 4,
thisArg ? pureFn.call(thisArg, exp1, exp2, exp3, exp4) : pureFn(exp1, exp2, exp3, exp4),
)
: getPureFunctionReturnValue(lView, bindingIndex + 4);
}
/**
* pureFunction instruction that can support any number of bindings.
*
* If the value of any provided exp has changed, calls the pure function to return
* an updated value. Or if no values have changed, returns cached value.
*
* @param lView LView in which the function is being executed.
* @param bindingRoot Binding root index.
* @param slotOffset the offset from binding root to the reserved slot
* @param pureFn A pure function that takes binding values and builds an object or array
* containing those values.
* @param exps An array of binding values
* @param thisArg Optional calling context of pureFn
* @returns Updated or cached value
*/
export function pureFunctionVInternal(
lView: LView,
bindingRoot: number,
slotOffset: number,
pureFn: (...v: any[]) => any,
exps: any[],
thisArg?: any,
): any {
let bindingIndex = bindingRoot + slotOffset;
let different = false;
for (let i = 0; i < exps.length; i++) {
bindingUpdated(lView, bindingIndex++, exps[i]) && (different = true);
}
return different
? updateBinding(lView, bindingIndex, pureFn.apply(thisArg, exps))
: getPureFunctionReturnValue(lView, bindingIndex);
}