flutter_quill_delta_easy_parser

Description:

flutter quill delta easy parser

Flutter Quill Easy Parser #
A Dart package designed to transform Flutter Quill content into a structured document format, making it easier to handle and convert for various use cases like generating Word or PDF documents.
Features #

Delta Parsing: Converts Quill Delta into a structured document format.
Attribute Handling: Simplifies management of text attributes like bold, italic, colors, etc.
Paragraph and Line Structuring: Organizes content into paragraphs and lines for easy manipulation.

Usage #
import 'package:flutter_quill_delta_easy_parser/flutter_quill_delta_easy_parser.dart';

void main() {
final delta = Delta()
..insert('This is ')
..insert('bold', {'bold': true})
..insert(' and ')
..insert('italic', {'italic': true})
..insert(' text with ')
..insert('custom color', {'color': '#FF0000'})
..insert('\n\n', {'header': 1})
..insert('This is a list item')
..insert('\n', {'list': 'ordered'})
..insert('Another list item')
..insert('\n', {'list': 'ordered'})
..insert('Third list item')
..insert('\n')
..insert('This is a ')
..insert('link', {'link': 'https://example.com'})
..insert(' to a website');

final Document? document = RichTextParser().parseDelta(delta);

if (document != null) {
print('Parsed Document:');
document.paragraphs.forEach((paragraph) {
print('Paragraph:');
paragraph.lines.forEach((line) {
print('Line: ${line.data}, Attributes: ${line.attributes}');
});
print('Block Attributes: ${paragraph.blockAttributes}');
});
}
/*
Document:
Paragraph:
Line: This is , Attributes: null
Line: bold, Attributes: {bold: true}
Line: and , Attributes: null
Line: italic, Attributes: {italic: true}
Line: text with , Attributes: null
Line: custom color, Attributes: {color: #FF0000}
Block Attributes: {header: 1}
Paragraph:
Line: \n, Attributes: null
Block Attributes: {header: 1}
Paragraph:
Line: This is a list item, Attributes: null
Block Attributes: {list: ordered}
Paragraph:
Line: Another list item, Attributes: null
Block Attributes: {list: ordered}
Paragraph:
Line: Third list item, Attributes: null
Block Attributes: null
Paragraph:
Line: This is a , Attributes: null
Line: link, Attributes: {link: https://example.com}
Line: to a website, Attributes: null
Block Attributes: null
*/
}
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What Does the Package Do? #
This package transforms the content of a Quill JS editor into an easy-to-work-with paragraph format.
By default, a QuillJS editor outputs its content in the Quill Delta format. While the Delta format works great for a browser-based editor like Quill, it's not the most convenient data format if you'd like to generate other types of documents (e.g., Word or PDF) from Quill's contents.
RichTextParser will transform a Quill Delta into a more convenient paragraph-based format.
How Does It Work?
Quill JS outputs a Delta with a format like the following:
final delta = Delta()
..insert('Hello, how are you?')
..insert('The first Major Section')
..insert('\n', {'header': 1})
..insert('We are writing some ')
..insert('bolded text',{'bold': true})
..insert('\n');
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RichTextParser will transform a Quill Delta into an easier-to-work-with paragraph format, like the one below:

final Document document = Document(paragraphs: [
Paragraph(
lines: [Line(data: "Hello, how are you?")]
),
Paragraph(
lines: [Line(data: "The First Major Section")],
blockAttributes: {"header": 1}
),
Paragraph(
lines: [
Line(data: "We are writing some "),
Line(data: "bolded text", attributes: {"bold": true})
]
),
Paragraph(lines: [Line('\n')], type: ParagraphType.block)
]);
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The Paragraph Format #
A parsed Quill JS document is composed entirely of paragraphs. Each paragraph must contain either a lines property, which indicates the content of the paragraph. A Paragraph may also contain a blockAttributes property, which indicates the formatting of the Paragraph.
Paragraph looks like:
class Paragraph {
final List<Line> lines;
ParagraphType? type; // this is an enum that contains values like: inline, block and embed
Map<String, dynamic>? blockAttributes; // contains all attributes (usually block attributes like "heaeder") that will be applied to whole lines

Paragraph({
required this.lines,
this.blockAttributes,
this.type,
});
}
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Lines #
A Line represents a segment of content within a Paragraph. This content can be a simple string of characters or a more complex structure such as an embed.

data: This can be either a string (representing text) or a map (representing an embed or other structured content).
attributes: A map containing key-value pairs that describe the formatting or other attributes of the Line.

Line looks like:
class Line{
Object? data;
Map<String, dynamic>? attributes;

Line({
this.data,
this.attributes,
});
}
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For example, consider the following Paragraph in Dart:

final Paragraph paragraph = Paragraph(
lines: [
Line(data: 'I am building a new package in Dart. '),
Line(data: 'This package will be ', attributes: {'bold': true}),
Line(data: 'open source', attributes: {'italic': true}),
Line(data: ' and it will help developers process the text entered into a QuillJS editor.'),
Line(data: {'image': 'https://example.com/image.png'}),
],
);
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Attributes #
Finally, a Paragraph can also have a blockAttributes property. This property indicates what type of paragraph-level formatting has been applied. For instance, a header is a Paragraph that is formatted as a header. Similarly, a bullet point is a Paragraph that is formatted as a bullet point. An example of a Paragraph with formatting is shown below.

final Paragraph bulletPointParagraph = Paragraph(
lines: [
Line(data: "I am a bullet point.")
],
blockAttributes: {"list": "bullet"},
type: ParagraphType.block,
);

final Paragraph bulletPointWithUnderlineParagraph = Paragraph(
lines: [
Line(data: "I am also a bullet point, but I have "),
Line(data: "underlined text", attributes: {"underline": true}),
Line(data: " included in my paragraph.")
],
blockAttributes: {"list": "bullet"},
type: ParagraphType.block,
);

final Document document = Document(paragraphs: [bulletPointWithUnderlineParagraph, bulletPointParagraph]);
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See the test folder for detailed usage examples and test cases.
Contributing #
Contributions are welcome! Please feel free to submit issues and pull requests.
License #
This project is licensed under the BSD-3-Clause License - see the LICENSE file for details.