Function ingestContent

packages/compiler/src/template/pipeline/src/ingest.ts:394–442

* Ingest a content node from the AST into the given `ViewCompilation`.

(unit: ViewCompilationUnit, content: t.Content)

 * Ingest a content node from the AST into the given `ViewCompilation`.
 */
function ingestContent(unit: ViewCompilationUnit, content: t.Content): void {
  if (content.i18n !== undefined && !(content.i18n instanceof i18n.TagPlaceholder)) {
    throw Error(`Unhandled i18n metadata type for element: ${content.i18n.constructor.name}`);
  }

  let fallbackView: ViewCompilationUnit | null = null;

  // Don't capture default content that's only made up of empty text nodes and comments.
  // Note that we process the default content before the projection in order to match the
  // insertion order at runtime.
  if (
    content.children.some(
      (child) =>
        !(child instanceof t.Comment) &&
        (!(child instanceof t.Text) || child.value.trim().length > 0),
    )
  ) {
    fallbackView = unit.job.allocateView(unit.xref);
    ingestNodes(fallbackView, content.children);
  }

  const id = unit.job.allocateXrefId();
  const op = ir.createProjectionOp(
    id,
    content.selector,
    content.i18n,
    fallbackView?.xref ?? null,
    content.sourceSpan,
  );
  for (const attr of content.attributes) {
    const securityContext = domSchema.securityContext(content.name, attr.name, true);
    unit.update.push(
      ir.createBindingOp(
        op.xref,
        ir.BindingKind.Attribute,
        attr.name,
        o.literal(attr.value),
        null,
        securityContext,
        true,
        false,
        null,
        asMessage(attr.i18n),
        attr.sourceSpan,
      ),
    );
  }
  unit.create.push(op);
}

/**
 * Ingest a literal text node from the AST into the given `ViewCompilation`.