Function ingestBoundText

packages/compiler/src/template/pipeline/src/ingest.ts:572–617

* Ingest an interpolated text node from the AST into the given `ViewCompilation`.

(
  unit: ViewCompilationUnit,
  text: t.BoundText,
  icuPlaceholder: string | null,
)

 * Ingest an interpolated text node from the AST into the given `ViewCompilation`.
 */
function ingestBoundText(
  unit: ViewCompilationUnit,
  text: t.BoundText,
  icuPlaceholder: string | null,
): void {
  let value = text.value;
  if (value instanceof e.ASTWithSource) {
    value = value.ast;
  }
  if (!(value instanceof e.Interpolation)) {
    throw new Error(
      `AssertionError: expected Interpolation for BoundText node, got ${value.constructor.name}`,
    );
  }
  if (text.i18n !== undefined && !(text.i18n instanceof i18n.Container)) {
    throw Error(
      `Unhandled i18n metadata type for text interpolation: ${text.i18n?.constructor.name}`,
    );
  }

  const i18nPlaceholders =
    text.i18n instanceof i18n.Container
      ? text.i18n.children
          .filter((node): node is i18n.Placeholder => node instanceof i18n.Placeholder)
          .map((placeholder) => placeholder.name)
      : [];
  if (i18nPlaceholders.length > 0 && i18nPlaceholders.length !== value.expressions.length) {
    throw Error(
      `Unexpected number of i18n placeholders (${value.expressions.length}) for BoundText with ${value.expressions.length} expressions`,
    );
  }

  const textXref = unit.job.allocateXrefId();
  unit.create.push(ir.createTextOp(textXref, '', icuPlaceholder, text.sourceSpan));
  unit.update.push(
    ir.createInterpolateTextOp(
      textXref,
      new ir.Interpolation(
        value.strings,
        value.expressions.map((expr) => convertAst(expr, unit.job, null)),
        i18nPlaceholders,
      ),
      text.sourceSpan,
    ),
  );
}

/**
 * Ingest an `@if` block into the given `ViewCompilation`.