Function setDirectiveInput

packages/core/src/render3/instructions/shared.ts:774–830

(
  tNode: TNode,
  tView: TView,
  lView: LView,
  target: DirectiveDef<unknown>,
  publicName: string,
  value: unknown,
)

 * @param value Value to set.
 */
export function setDirectiveInput(
  tNode: TNode,
  tView: TView,
  lView: LView,
  target: DirectiveDef<unknown>,
  publicName: string,
  value: unknown,
): boolean {
  let hostIndex: number | null = null;
  let hostDirectivesStart: number | null = null;
  let hostDirectivesEnd: number | null = null;
  let hasSet = false;

  if (ngDevMode && !tNode.directiveToIndex?.has(target.type)) {
    throw new Error(`Node does not have a directive with type ${target.type.name}`);
  }

  const data = tNode.directiveToIndex!.get(target.type)!;

  if (typeof data === 'number') {
    hostIndex = data;
  } else {
    [hostIndex, hostDirectivesStart, hostDirectivesEnd] = data;
  }

  if (
    hostDirectivesStart !== null &&
    hostDirectivesEnd !== null &&
    tNode.hostDirectiveInputs &&
    Object.hasOwn(tNode.hostDirectiveInputs, publicName)
  ) {
    const hostDirectiveInputs = tNode.hostDirectiveInputs[publicName];

    for (let i = 0; i < hostDirectiveInputs.length; i += 2) {
      const index = hostDirectiveInputs[i] as number;

      if (index >= hostDirectivesStart && index <= hostDirectivesEnd) {
        ngDevMode && assertIndexInRange(lView, index);
        const def = tView.data[index] as DirectiveDef<unknown>;
        const hostDirectivePublicName = hostDirectiveInputs[i + 1] as string;
        writeToDirectiveInput(def, lView[index], hostDirectivePublicName, value);
        hasSet = true;
      } else if (index > hostDirectivesEnd) {
        // Directives here are in ascending order so we can stop looking once we're past the range.
        break;
      }
    }
  }

  if (hostIndex !== null && Object.hasOwn(target.inputs, publicName)) {
    ngDevMode && assertIndexInRange(lView, hostIndex);
    writeToDirectiveInput(target, lView[hostIndex], publicName, value);
    hasSet = true;
  }

  return hasSet;
}