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Fluri is a fluent URI library for Dart built to make URI mutation easy.

The dart:core.Uri class provides an immutable representation of URIs, which makes it difficult to incrementally build them or update them at a later time. If you wanted to build a long URI from the individual pieces, you would do something like this:

var uri = Uri(
  scheme: 'https',
  host: 'example.com',
  path: 'path/to/resource'

If you later wanted to update the path and add a query parameter, you'd have to do this:

uri = uri.replace(
  path: 'new/path',
  query: 'foo=true'

Now let's say you want update the query without losing what you already have:

var query = Map.from(uri.queryParameters);
query['bar'] = '10';
uri = uri.replace(queryParameters: query);

As you can see, incremental or fluent-style URI mutations become a hassle with the core Uri class.

With fluri, the above interactions are easy:

import 'package:fluri/fluri.dart';

var fluri = Fluri()
  ..scheme = 'https'
  ..host = 'example.com'
  ..path = 'path/to/resource';

  ..path = 'new/path'
  ..query = 'foo=true';

fluri.updateQuery({'bar': '10'});

Additional methods like appendToPath and setQueryParam make it easy to build on top of a base URL:

import 'package:fluri/fluri.dart';

var base = Fluri('https://example.com/base/');

var fluri = Fluri.from(base)
  ..setQueryParam('count', '10');

Fluri also supports multi-value parameters. To access the query parameters as Map<String, List<String>>, use queryParametersAll (just like the Uri class):

var fluri = Fluri('/resource?format=json&format=text');
print(fluri.queryParameters); // {'format': 'text'}
print(fluri.queryParametersAll); // {'format': ['json', 'text']}

To set a single query parameter to multiple values:

var fluri = Fluri('/resource');
fluri.setQueryParam('format', ['json', 'text']);
print(fluri.queryParametersAll); // {'format': ['json', 'text']}

Using setQueryParam will always replace existing values:

var fluri = Fluri('/resource');
fluri.setQueryParam('format', ['json', 'text']);
fluri.setQueryParam('format', ['binary', 'text']);
print(fluri.queryParametersAll); // {'format': ['binary', 'text']}

You can use the queryParametersAll setter to set the entire query with multi-value param support:

var fluri = Fluri('/resource');
fluri.queryParametersAll = {'format': ['json', 'text'], 'count': ['5']}
print(fluri.queryParametersAll); // {'format': ['json', 'text'], 'count': ['5']}

Again, if you need to preserve existing query parameters, you can use the updateQuery method to do so. Set mergeValues: true and any values that you provide will be merged with existing values:

var fluri = Fluri('/resource?format=json');
fluri.updateQuery({'format': ['binary', 'text'], 'count': '5'}, mergeValues: true);
print(fluri.queryParametersAll); // {'format': ['binary', 'json', 'text'], 'count': ['5']}


A fluent URI mutation library.