A Python template engine with support for variables, functions, conditionals, loops, and includes
Project description
๐ Python Template Engine
A powerful, lightweight template engine for Python with support for variables, functions, conditionals, loops, and file includes. Built for simplicity and extensibility.
โจ Features
- ๐ค Variable substitution -
{{name}},{{user.email}} - โก Function calls -
{{get_time()}},{{utils.format()}} - ๐ Conditionals -
{{#IF condition}}...{{#ELSE}}...{{/IF}} - ๐ Loops -
{{#EACH items AS item}}...{{/EACH}} - ๐ File includes -
{{#INCLUDE file_path}} - ๐จ Template rendering -
{{#RENDER template_path}} - ๐งช Fully tested - Comprehensive test suite with 54 tests
- ๐ฏ Type hints - Full type annotation support
- ๐๏ธ Extensible - Modular architecture for custom engines
๐ Quick Start
Installation
# Clone the repository
git clone https://github.com/your-username/py-templater.git
cd py-templater
# Create virtual environment (recommended)
python3 -m venv .venv
source .venv/bin/activate # On Windows: .venv\Scripts\activate
# Install in development mode
pip install -e .
Basic Usage
from py_template_engine import TemplateEngine
# Simple variable substitution
template = "Hello {{name}}!"
engine = TemplateEngine(template_string=template)
result = engine.render(name="World")
print(result) # Output: Hello World!
๐ Template Syntax
Variables
<!-- Basic variables -->
<h1>{{title}}</h1>
<p>Welcome {{user.name}}!</p>
<!-- Nested object access -->
<span>{{user.profile.email}}</span>
Functions
<!-- Function calls -->
<p>Current time: {{get_time()}}</p>
<p>Formatted date: {{utils.format_date()}}</p>
Conditionals
<!-- IF/ELSE statements -->
{{#IF user_logged_in}}
<p>Welcome back, {{username}}!</p>
{{#ELSE}}
<p>Please log in to continue</p>
{{/IF}}
<!-- Nested conditions -->
{{#IF user}}
{{#IF user.is_premium}}
<span class="premium">Premium User</span>
{{/IF}}
{{/IF}}
Loops
<!-- EACH loops -->
<ul>
{{#EACH items AS item}}
<li>{{item}}</li>
{{/EACH}}
</ul>
<!-- Loop with objects -->
{{#EACH users AS user}}
<div class="user">
<h3>{{user.name}}</h3>
<p>{{user.email}}</p>
</div>
{{/EACH}}
File Operations
<!-- Include raw file content -->
{{#INCLUDE header_file}}
<!-- Render template with full processing -->
{{#RENDER user_template}}
๐ก Advanced Examples
Complete Web Page Template
<!DOCTYPE html>
<html>
<head>
<title>{{page_title}}</title>
</head>
<body>
{{#INCLUDE header.html}}
<main>
{{#IF featured_posts}}
<section class="featured">
<h2>Featured Posts</h2>
{{#EACH featured_posts AS post}}
<article>
<h3>{{post.title}}</h3>
<p>{{post.excerpt}}</p>
<time>{{post.format_date()}}</time>
</article>
{{/EACH}}
</section>
{{/IF}}
{{#RENDER content_template}}
</main>
{{#INCLUDE footer.html}}
</body>
</html>
from py_template_engine import TemplateEngine
engine = TemplateEngine(template_path="page.html")
result = engine.render(
page_title="My Blog",
featured_posts=[
{
"title": "Getting Started",
"excerpt": "Learn the basics...",
"format_date": lambda: "2024-01-15"
}
],
header_file="includes/header.html",
content_template="templates/blog_content.html"
)
Dynamic Dashboard
# Context data
dashboard_data = {
"user": {
"name": "Alice Johnson",
"role": "admin",
"notifications": 5
},
"stats": [
{"label": "Users", "value": 1247},
{"label": "Revenue", "value": "$52,340"},
{"label": "Orders", "value": 89}
],
"is_admin": True,
"get_alert_class": lambda count: "danger" if count > 10 else "info"
}
template = """
<div class="dashboard">
<h1>Welcome {{user.name}}</h1>
{{#IF is_admin}}
<div class="admin-panel">
<h2>Admin Controls</h2>
<p>Notifications: <span class="{{get_alert_class()}}">{{user.notifications}}</span></p>
</div>
{{/IF}}
<div class="stats">
{{#EACH stats AS stat}}
<div class="stat-card">
<h3>{{stat.label}}</h3>
<p class="value">{{stat.value}}</p>
</div>
{{/EACH}}
</div>
</div>
"""
engine = TemplateEngine(template_string=template)
result = engine.render(**dashboard_data)
๐๏ธ API Reference
TemplateEngine
class TemplateEngine:
def __init__(self, template_path: Optional[str] = None,
template_string: Optional[str] = None) -> None:
"""
Initialize template engine with either file path or string.
Args:
template_path: Path to template file
template_string: Template content as string
Raises:
ValueError: If neither template_path nor template_string provided
"""
def render(self, **kwargs) -> str:
"""
Render template with provided context variables.
Args:
**kwargs: Template context variables
Returns:
Rendered template as string
"""
๐งช Testing
Run the comprehensive test suite:
# Activate virtual environment
source .venv/bin/activate
# Run all tests with pytest
pytest tests -v
# Run specific test file
python tests/test_template_engine.py
# Run with coverage
pytest tests --cov=py_template_engine
Test Coverage: 54 tests covering all features:
- Variable substitution (basic + nested)
- Function calls (simple + nested objects)
- Conditional logic (IF/ELSE + nested)
- Loop processing (EACH + complex data)
- File operations (INCLUDE + RENDER)
- Error handling & edge cases
๐ง Development
Project Structure
py-templater/
โโโ py_template_engine/ # Main package
โ โโโ __init__.py
โ โโโ TemplateEngine.py # Main engine
โ โโโ TemplaterInterface.py
โ โโโ sub_engines/ # Individual processors
โ โโโ VariableTemplater.py
โ โโโ FunctionTemplater.py
โ โโโ IfTemplater.py
โ โโโ EachTemplater.py
โ โโโ IncludeTemplater.py
โ โโโ RenderTemplater.py
โโโ tests/ # Test suite
โโโ examples/ # Usage examples
โโโ pyproject.toml # Project configuration
Adding Custom Engines
Create custom template processors by extending TemplaterInterface:
from py_template_engine.TemplaterInterface import TemplaterInterface
import re
class CustomTemplater(TemplaterInterface):
def render(self, template: str, **kwargs) -> str:
return re.sub(
r'{{#CUSTOM (.*?)}}',
lambda m: self.process(m.group(1), **kwargs),
template
)
def process(self, content: str, **kwargs) -> str:
# Custom processing logic
return f"Processed: {content}"
๐ค Contributing
- Fork the repository
- Create a feature branch (
git checkout -b feature/amazing-feature) - Write tests for your changes
- Ensure all tests pass (
pytest tests) - Commit your changes (
git commit -m 'Add amazing feature') - Push to the branch (
git push origin feature/amazing-feature) - Open a Pull Request
๐ License
This project is licensed under the MIT License - see the LICENSE file for details.
Happy templating! ๐
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