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Backslant or python templates engines design guidelines.
The document provides alternative guidelines for designing Python templates that improve interoperability between template engines like Jinja2. It recommends using Python's import to load templates, defining all template components as functions, and generating HTML from markup languages to play nicely with other engines like Jinja2. An example Backslant template language is shown that follows these principles and allows easy rendering from Python code and interoperability with Jinja2.
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Backslant or python templates engines design guidelines.
- 1. PYTHON TEMPLATES DESIGN GUIDELINES RIGHTWAY TO MAKE THINGS BAD
- 2. DO YOUR OWNJINJA2 PYTHON TEMPLATES GUIDELINES • make ad-hoc loading machinery (template loaders) • reinvent semi programming language (filters, includes, templatetags) • hide functions and prohibit direct usage • make it hard to use with other template engines • don’t help to generate HTML
- 3. FROM DJANGO.TEMPLATE.LOADER IMPORT RENDER_TO_STRING TEMPLATELOADING • reinvent the wheel everytime • dont use python one
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- 7. INTEROPERABILITY COMPATIBILITY • We wantto use this new fast and shiny new templates! • Rails way — ok, `gem install new_shiny_project`, start to use • Python way — no way, we need to rewrite everything! Pain and suffer, cry everywhere. • Why? Jinja2 awaits that loaders return text, not ready to use function.
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- 9. ALTERNATIVE GUIDELINES BACKSLANT • usepython import to load templates • functions for everything • generate HTML from jade/slim/haml like lang • play nice with jinja2
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- 11. IN ACTION BACKSLANT - definput(name, label): div.pretty-input-sm2 label(for=(name)) = name input(name=(name)) - def render(about): html body a(href="") ‘ABOUT' = about form == input(‘username’, ‘Your name’) import backslant backslant.install_loader() from project.templates.main import render @app.route(‘/‘) def main(req): return backslant.string( render( about=“HELLO” ) )
- 12. JINJA2 INTEROPERABILITY BACKSLANT - frombackslant.flask import extend_jinja2, include_jinja2 :call extend_jinja2('layouts/base.html') - def content(ctx): h2 "And something about other template engines"