public translateSnippet()

in src/rosetta-reader.ts [188:238]
42 lines of code
9 McCabe index (conditional complexity)

  public translateSnippet(source: TypeScriptSnippet, targetLang: TargetLanguage): Translation | undefined {
    // Look for it in loaded tablets (or previous conversions)
    for (const tab of this.allTablets) {
      const ret = tab.lookup(source, targetLang);
      if (ret !== undefined) {
        return this.prefixDisclaimer(ret, this._prefixDisclaimer);
      }
    }

    if (this.unknownSnippets === UnknownSnippetMode.VERBATIM) {
      return this.prefixDisclaimer(
        {
          language: targetLang,
          source: source.visibleSource,
        },
        this._prefixDisclaimer,
      );
    }

    if (this.unknownSnippets === UnknownSnippetMode.FAIL) {
      const message = [
        'The following snippet was not found in any of the loaded tablets:',
        source.visibleSource,
        `Location: ${JSON.stringify(source.location)}`,
        `Language: ${targetLang}`,
      ].join('\n');
      throw new Error(message);
    }

    if (this.options.targetLanguages && !this.options.targetLanguages.includes(targetLang)) {
      throw new Error(
        `Rosetta configured for live conversion to ${this.options.targetLanguages.join(
          ', ',
        )}, but requested ${targetLang}`,
      );
    }

    // See if we can find a fixturized version of this snippet. If so, use that do the live
    // conversion.
    const extracted = this.extractedSnippets.get(snippetKey(source));
    if (extracted !== undefined) {
      const snippet = this.translator.translate(extracted, this.options.targetLanguages);
      this.liveTablet.addSnippet(snippet);
      return this.prefixDisclaimer(snippet.get(targetLang), this._prefixDisclaimer);
    }

    // Try to live-convert it as-is.
    const snippet = this.translator.translate(source, this.options.targetLanguages);
    this.liveTablet.addSnippet(snippet);
    return this.prefixDisclaimer(snippet.get(targetLang), this._prefixDisclaimer);
  }