Method visitExpansion

packages/compiler/src/i18n/i18n_parser.ts:137–170

(icu: html.Expansion, context: I18nMessageVisitorContext)

  }

  visitExpansion(icu: html.Expansion, context: I18nMessageVisitorContext): i18n.Node {
    context.icuDepth++;
    const i18nIcuCases: {[k: string]: i18n.Node} = {};
    const i18nIcu = new i18n.Icu(icu.switchValue, icu.type, i18nIcuCases, icu.sourceSpan);
    icu.cases.forEach((caze): void => {
      i18nIcuCases[caze.value] = new i18n.Container(
        caze.expression.map((node) => node.visit(this, context)),
        caze.expSourceSpan,
      );
    });
    context.icuDepth--;

    if (context.isIcu || context.icuDepth > 0) {
      // Returns an ICU node when:
      // - the message (vs a part of the message) is an ICU message, or
      // - the ICU message is nested.
      const expPh = context.placeholderRegistry.getUniquePlaceholder(`VAR_${icu.type}`);
      i18nIcu.expressionPlaceholder = expPh;
      context.placeholderToContent[expPh] = {
        text: icu.switchValue,
        sourceSpan: icu.switchValueSourceSpan,
      };
      return context.visitNodeFn(icu, i18nIcu);
    }

    // Else returns a placeholder
    // ICU placeholders should not be replaced with their original content but with their
    // translations.
    // TODO(vicb): add a html.Node -> i18n.Message cache to avoid having to re-create the msg
    const phName = context.placeholderRegistry.getPlaceholderName('ICU', icu.sourceSpan.toString());
    context.placeholderToMessage[phName] = this.toI18nMessage([icu], '', '', '', undefined);
    const node = new i18n.IcuPlaceholder(i18nIcu, phName, icu.sourceSpan);
    return context.visitNodeFn(icu, node);
  }

  visitExpansionCase(_icuCase: html.ExpansionCase, _context: I18nMessageVisitorContext): i18n.Node {
    throw new Error('Unreachable code');