Beautiful HTML/XHTML/XML using YAML
Beautiful HTML/XHTML/XML using YAML.
Yatom is a YAML to markup compiler supporting XML and HTML as output formats.
HTML and its siblings are not friendly at all, their very convoluted and often unreadable nature (due its parent: SGML) cannot be overtaken regardless on how much effort is put on both indentation and formatting. And even that requires further postprocessing to avoid the a huge size overhead.
In some way, Yatom shares the same concept as jedi/pugjs and HAML, but unless being yaml-inspiredTM, Yatom is absolutely pure YAML, completely language agnostic, without extra stuff, requirements or incompatibilities.
YAML in, HTML out, simple.
Simple HTML5 page using Yatom.
import yatom source = ''' doctype: html5 html: head: title: My Yatom page! body: h2: Yatom is awesome p: >- Now, you can code your page with beautiful markup without worrying about inefficient HTML output nor erratic linebreak behavior thanks to Yatom. ''' print( yatom.HTMLProcessor .from_source(source) .render() )
<!DOCTYPE html> <html><head><title>My Yatom page!</title></head><body><h2>Yatom is awesome</h2><p>Now, you can code your page with beautiful markup without worrying about inefficient HTML output nor erratic linebreak behavior thanks to Yatom.</p></body></html>
The Yatom syntax
Yatom uses regular YAML, but that doesn't mean documents can of arbitrary shape.
The YAML document structure is defined by the target language, but mostly all follow the following rules:
- YAML root must be a mapping, as mappings define the document structure.
- If a non-mapping value is is encountered, it is treated as text.
The YAML syntax defining an entire HTML document is quite simple. If you already know HTML you can start writing Yatom templates with very few rules:
- Mapping keys are tag names, with one exception:
doctypeis handled differently, its accepted values are listed here:
- Mapping string values are treated as text content.
- Dot-prefixed keys are tag attributes and must appear before any other sibling keys, with some exceptions:
- .text for inline text strings (escaped)
- .literal for unescaped inlined text strings (allowing inline markup)
- .cdata for XML CDATA tags
- .comment for HTML comments
In addition to previous rules, attributes support nesting, with the following rules:
- When style value is a mapping, properties are treated as CSS properties, and nested mapping keys are joined with dashes (
- When class value is a mapping or list, its properties are treated as different classes (the dot is prefixed). It its a mapping its hierarchy (mapping or array) is combined with dashes (
- If any other attribute value is a mapping or list, its hierarchy is combined with dashes (
And as a bonus, and only if required by doctype, few tags provide sane defaults:
- Both html4 and xhtml:
- Only xhtml:
htmlelement has both default
scriptelement's content is automatically wrapped with
Semantic HTML rules are applied.
Simple example for HTML5.
import yatom source = ''' doctype: html5 html: head: title: my page body: h2: my page p: | multiline text p: .text: mixed span: .style: color: red .text: tags .text: and strong: text ''' print( yatom.HTMLProcessor .from_source(source) .render() )
<!DOCTYPE html> <html><head><title>my page</title></head><body><h2>my page</h2><p>multiline text </p><p>mixed<span style="color:red">tags</span>and<strong>text</strong></p></body></html>
More advanced XHTML4 example.
import yatom source = ''' doctype: xhtml11 html: head: title: my page script: window.alert('<hello world>') body: .data: something: 1 other: 2 .class: - simple: - nested - other .style: padding: top: 2em bottom: 2em left: 25% right: 25% p: some simple text ''' print( yatom.HTMLProcessor .from_source(source) .render() )
- <input type="checkbox" disabled="" /> Pretty print
- <input type="checkbox" disabled="" /> Pluggable templating engines or logic
- <input type="checkbox" disabled="" /> Drop python2 for good
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