trellis 0.2.1 
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leafnode.seTemplate engine for Dart, using natural HTML templates. Fragment-first for hypermedia-driven frameworks like HTMX. Inspired by Thymeleaf.
example/example.dart
// Self-contained trellis example — no external dependencies.
//
// Run: dart run example/example.dart
import 'package:trellis/trellis.dart';
void main() {
final engine = Trellis(
loader: MapLoader({}),
filters: {'currency': (v) => '\$${(v as num).toStringAsFixed(2)}'},
);
// --- Template featuring v0.2 attributes ---
const template = '''
<html>
<body>
<h1 tl:text="\${title}">Page Title</h1>
<!-- Conditional -->
<p tl:if="\${user}" tl:text="'Welcome, ' + \${user.name | upper} + '!'">
Welcome, Guest!
</p>
<!-- Switch -->
<div tl:switch="\${role}">
<span tl:case="admin">Admin panel</span>
<span tl:case="user">Dashboard</span>
<span tl:case="*">Guest view</span>
</div>
<!-- Iteration with classappend -->
<ul tl:fragment="itemList">
<li tl:each="item : \${items}"
tl:text="\${item.name} + ' — ' + \${item.price | currency}"
tl:classappend="\${itemStat.odd} ? 'alt' : ''">
placeholder
</li>
</ul>
<!-- Parameterized fragment -->
<div tl:fragment="card(heading, body)">
<h2 tl:text="\${heading}">Heading</h2>
<p tl:text="\${body}">Body</p>
</div>
<!-- Include the parameterized fragment with arguments -->
<div tl:insert="card('Features', 'Fragment-first design')">card slot</div>
<!-- Named fragment for renderFragments demo -->
<footer tl:fragment="footer" tl:text="\${title}">Footer</footer>
</body>
</html>
''';
final context = {
'title': 'Trellis v0.2 Demo',
'user': {'name': 'Alice'},
'role': 'admin',
'items': [
{'name': 'Widget', 'price': 9.99},
{'name': 'Gadget', 'price': 24.5},
{'name': 'Gizmo', 'price': 3},
],
};
// Full page render
print('=== Full Page ===');
print(engine.render(template, context));
// Fragment render (HTMX partial)
print('\n=== Fragment: itemList ===');
print(engine.renderFragment(template, fragment: 'itemList', context: context));
// Multi-fragment render (HTMX OOB swap)
print('\n=== renderFragments: itemList + footer ===');
print(engine.renderFragments(
template,
fragments: ['itemList', 'footer'],
context: context,
));
// Standalone expression evaluator
final evaluator = ExpressionEvaluator();
print('\n=== ExpressionEvaluator ===');
print(evaluator.evaluate(r'${x} + ${y}', {'x': 10, 'y': 32})); // 42
}Metadata
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Metadata
Template engine for Dart, using natural HTML templates. Fragment-first for hypermedia-driven frameworks like HTMX. Inspired by Thymeleaf.
Repository (GitHub)
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Topics
#template #html #htmx #server-side-rendering
License
unknown (license)
