**fast_html** is a fast, minimalist HTML generator.
It is an alternative to templating engines, like Jinja,
for use with, e.g., [htmx](https://htmx.org/).
**Pros:**
- use familiar python syntax
- use efficient concatenation techniques
- optional automatic indentation
Unlike other HTML generators (e.g. [Dominate](https://pypi.org/project/dominate/)) that use python objects to represent HTML snippets,
fast_html represents HTML snippets using string [generators](https://docs.python.org/3/glossary.html#term-generator)
that can be rendered extremely fast using `join`.
(see [here](https://python.plainenglish.io/concatenating-strings-efficiently-in-python-9bfc8e8d6f6e))
**Like other HTML generators, one needs to remember:**
- the name of some tags and attributes is changed (e.g., `class_` instead of `class`, due to Python parser)
- there may be conflicts of function names with your code base
Installation
============
`pip install fast_html` or copy the (single) source file in your project.
Don't forget to `add a star on GitHub <https://github.com/pcarbonn/fast_html>`_ ! Thanks.
Tutorial:
=========
>>> from fast_html import *
A tag is created by calling a function of the corresponding name,
and rendered using `render`:
>>> print(render(p("text")))
<p>text</p>
Tag attributes are specified using named arguments:
>>> print(render(br(id=1)))
<br id="1">
>>> print(render(br(id=None)))
<br>
>>> print(render(ul(li("text", selected=True))))
<ul><li selected>text</li></ul>
>>> print(render(ul(li("text", selected=False))))
<ul><li>text</li></ul>
The python parser introduces some constraints:
- The following tags require a trailing underscore: `del_`, `input_`, `map_`, `object_`.
- The following tag attributes require a trailing underscore: `class_`, `for_`.
In fact, the trailing underscore in attribute names is always removed by fast_html,
and other underscores are replaced by `-`.
For example, the htmx attribute `hx-get` is set using `hx_get="url"`.
>>> print(render(object_("text", class_="s12", hx_get="url")))
<object class="s12" hx-get="url">text</object>
>>> print(render(button("Click me", hx_post="/clicked", hx_swap="outerHTML")))
<button hx-post="/clicked" hx-swap="outerHTML">Click me</button>
The innerHTML can be a list:
>>> print(render(div(["text", span("item 1"), span("item 2")])))
<div>text<span>item 1</span><span>item 2</span></div>
The innerHTML can also be a list of lists:
>>> print(render(div(["text", [span(f"item {i}") for i in [1,2]]])))
<div>text<span>item 1</span><span>item 2</span></div>
>>> print(render([br(), br()]))
<br><br>
The innerHTML can also be specified using the `i` parameter,
after the other attributes, to match the order of rendering:
>>> print(render(ul(class_="s12", i=[
... li("item 1"),
... li("item 2")]
... )))
<ul class="s12"><li>item 1</li><li>item 2</li></ul>
You can create your own tag using the `tag` function:
>>> def my_tag(inner=None, **kwargs):
... yield from tag("my_tag", inner, **kwargs)
>>> print(render(my_tag("text")))
<my_tag>text</my_tag>
Options:
========
By default, the inner string of a tag is not escaped:
characters `&`, `<` and `>` in it are not converted to HTML-safe sequences.
>>> print(render(p("<bold>text</bold>")))
<p><bold>text</bold></p>
Of course, you can escape strings before calling fast_html:
>>> from html import escape
>>> print(render(p(escape("<bold>text</bold>"))))
<p><bold>text</bold></p>
If your policy is to escape every inner string,
you can activate escaping by setting the variable `escape` to `False`
(or by calling `escape_it(False)`).
>>> escape_it(True)
>>> print(render(p("<bold>text</bold>")))
<p><bold>text</bold></p>
When debugging your code, you can set global variable `indent` to `True`
(or call `indent_it(True)`) to obtain HTML with tag indentation, e.g.,
>>> indent_it(True)
>>> print(render(div(class_="s12", i=["text\n", span("item 1"), span("item 2")])))
<div class="s12">
text
<span>
item 1
</span>
<span>
item 2
</span>
</div>
<BLANKLINE>
You can also convert an HTML string to a function-based code representation:
>>> print(html_to_code('<div class="example"><p>Some text</p></div>'))
[div([p(['Some text'], )], class_="example")]
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