String generateCode()

in packages/snippets/lib/snippet_generator.dart [341:455]
113 lines of code
18 McCabe index (conditional complexity)

  String generateCode(
    CodeSample sample, {
    File? output,
    String? copyright,
    String? description,
    bool formatOutput = true,
    bool addSectionMarkers = false,
    bool includeAssumptions = false,
  }) {
    configuration.createOutputDirectoryIfNeeded();

    sample.metadata['copyright'] ??= copyright;
    final List<TemplateInjection> snippetData = parseInput(sample);
    sample.description = description ?? sample.description;
    sample.metadata['description'] = _getDescription(sample);
    switch (sample.runtimeType) {
      case DartpadSample:
      case ApplicationSample:
        String app;
        if (sample.sourceFile == null) {
          final String templateName = sample.template;
          if (templateName.isEmpty) {
            io.stderr
                .writeln('Non-linked samples must have a --template argument.');
            io.exit(1);
          }
          final Directory templatesDir = configuration.templatesDirectory;
          File? templateFile;
          templateFile =
              getTemplatePath(templateName, templatesDir: templatesDir);
          if (templateFile == null) {
            io.stderr.writeln(
                'The template $templateName was not found in the templates '
                'directory ${templatesDir.path}');
            io.exit(1);
          }
          final String templateContents = _loadFileAsUtf8(templateFile);
          final String templateRelativePath =
              templateFile.absolute.path.contains(flutterRoot.absolute.path)
                  ? path.relative(templateFile.absolute.path,
                      from: flutterRoot.absolute.path)
                  : templateFile.absolute.path;
          final String templateHeader = '''
// Template: $templateRelativePath
//
// Comment lines marked with "▼▼▼" and "▲▲▲" are used for authoring
// of samples, and may be ignored if you are just exploring the sample.
''';
          app = interpolateTemplate(
            snippetData,
            addSectionMarkers
                ? '$templateHeader\n$templateContents'
                : templateContents,
            sample.metadata,
            addSectionMarkers: addSectionMarkers,
            addCopyright: copyright != null,
          );
        } else {
          app = sample.sourceFileContents;
        }
        sample.output = app;
        if (formatOutput) {
          final DartFormatter formatter =
              DartFormatter(pageWidth: 80, fixes: StyleFix.all);
          try {
            sample.output = formatter.format(sample.output);
          } on FormatterException catch (exception) {
            io.stderr
                .write('Code to format:\n${_addLineNumbers(sample.output)}\n');
            errorExit('Unable to format sample code: $exception');
          }
          sample.output = sortImports(sample.output);
        }
        if (output != null) {
          output.writeAsStringSync(sample.output);

          final File metadataFile = configuration.filesystem.file(path.join(
              path.dirname(output.path),
              '${path.basenameWithoutExtension(output.path)}.json'));
          sample.metadata['file'] = path.basename(output.path);
          final Map<String, Object?> metadata = sample.metadata;
          if (metadata.containsKey('description')) {
            metadata['description'] = (metadata['description']! as String)
                .replaceAll(RegExp(r'^// ?', multiLine: true), '');
          }
          metadataFile.writeAsStringSync(jsonEncoder.convert(metadata));
        }
        break;
      case SnippetSample:
        if (sample is SnippetSample) {
          String app;
          if (sample.sourceFile == null) {
            String templateContents;
            if (includeAssumptions) {
              templateContents =
                  '${headers.map<String>((SourceLine line) => line.text).join('\n')}\n{{#assumptions}}\n{{description}}\n{{code}}';
            } else {
              templateContents = '{{description}}\n{{code}}';
            }
            app = interpolateTemplate(
              snippetData,
              templateContents,
              sample.metadata,
              addSectionMarkers: addSectionMarkers,
              addCopyright: copyright != null,
            );
          } else {
            app = sample.inputAsString;
          }
          sample.output = app;
        }
        break;
    }
    return sample.output;
  }