quill_delta_core

Core types and Delta utilities for the quill_delta_* converter family. Pure Dart. Zero HTML / binary dependencies.

What's inside

You usually pull this in transitively via one of the format packages (quill_delta_html, quill_delta_markdown, quill_delta_docx, quill_delta_pdf). Use this package directly if you're writing your own converter.

Minimal converter

import 'package:dart_quill_delta/dart_quill_delta.dart';
import 'package:quill_delta_core/quill_delta_core.dart';

final class CsvExporter
    implements DeltaExporter<String, ConverterOptions>,
               SyncDeltaExporter<String, ConverterOptions> {
  const CsvExporter();
  @override String get format => 'csv';
  @override String get mimeType => 'text/csv';
  @override String get extension => 'csv';
  @override ConverterOptions get defaultOptions =>
      const _DefaultCsvOptions();
  @override Future<String> export(Delta delta, {ConverterOptions? options}) async =>
      exportSync(delta, options: options);
  @override String exportSync(Delta delta, {ConverterOptions? options}) {
    final buf = StringBuffer();
    for (final line in splitIntoLines(delta)) {
      buf.writeln(line.ops.map((o) => o.isText ? o.asText : '').join(','));
    }
    return buf.toString();
  }
}

class _DefaultCsvOptions extends ConverterOptions {
  const _DefaultCsvOptions();
}

Errors

Every error raised by an importer / exporter is a subtype of DeltaConversionException. Catch the supertype, dispatch on the leaf:

try {
  await registry.importAuto(bytes, filename: 'doc.pdf');
} on UnsupportedFormatException catch (e) {
  // PDF import not yet implemented.
} on MalformedDocumentException catch (e) {
  // .docx archive corrupt; .html unparseable; etc.
} on DeltaConversionException catch (e) {
  // Other conversion failures.
}