Function executeTemplate

packages/core/src/render3/instructions/shared.ts:86–116

(
  tView: TView,
  lView: LView<T>,
  templateFn: ComponentTemplate<T>,
  rf: RenderFlags,
  context: T,
)

import {writeToDirectiveInput} from './write_to_directive_input';

export function executeTemplate<T>(
  tView: TView,
  lView: LView<T>,
  templateFn: ComponentTemplate<T>,
  rf: RenderFlags,
  context: T,
) {
  const prevSelectedIndex = getSelectedIndex();
  const isUpdatePhase = rf & RenderFlags.Update;
  try {
    setSelectedIndex(-1);
    if (isUpdatePhase && lView.length > HEADER_OFFSET) {
      // When we're updating, inherently select 0 so we don't
      // have to generate that instruction for most update blocks.
      selectIndexInternal(tView, lView, HEADER_OFFSET, !!ngDevMode && isInCheckNoChangesMode());
    }

    const preHookType = isUpdatePhase
      ? ProfilerEvent.TemplateUpdateStart
      : ProfilerEvent.TemplateCreateStart;
    profiler(preHookType, context as unknown as {}, templateFn);
    templateFn(rf, context);
  } finally {
    setSelectedIndex(prevSelectedIndex);

    const postHookType = isUpdatePhase
      ? ProfilerEvent.TemplateUpdateEnd
      : ProfilerEvent.TemplateCreateEnd;
    profiler(postHookType, context as unknown as {}, templateFn);
  }
}

/**
 * Creates directive instances.