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Added the demoed uhtml from Python test page
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‎test/uhtml/config.toml

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[[fetch]]
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files = ["./js_template.py", "./uhtml.py"]

‎test/uhtml/index.html

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<!doctype html>
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<html lang="en">
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<head>
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<meta charset="UTF-8" />
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<meta name="viewport" content="width=device-width,initial-scale=1.0">
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<title>Template</title>
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<script defer src="https://cdn.jsdelivr.net/npm/uhtml/es.js"></script>
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<script type="module" src="https://cdn.jsdelivr.net/npm/polyscript"></script>
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<script type="pyodide" src="./index.py" config="./config.toml"></script>
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</head>
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<body></body>
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</html>

‎test/uhtml/index.py

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from js import document
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from uhtml import render, html
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def update(count):
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render(document.body, html(
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"""
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<h3 onclick=${h3_click}>
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Hello ${value}
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</h3>
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<button onclick=${button_click}>
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Clicks ${count}
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</button>
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""",
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h3_click=lambda event: print(event.type),
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value="World",
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button_click=lambda _: update(count + 1),
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count=count
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))
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update(0)

‎test/uhtml/js_template.py

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# A silly idea by Andrea Giammarchi
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from string import Template as _Template
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# The goal of this utility is to create a JS
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# Template Literal Tag like function that accepts
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# an immutable template as tuple and zero or more ordered
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# interpolated values per each gap between chunks.
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# If a cache dictionary is passed, it never parses the same
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# template string more than once, improving performance
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# for more complex scenarios / use cases.
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def tag(fn, cache=None):
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return lambda tpl, **kw: _tag(tpl, cache)(fn, **kw)
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def _create(tpl):
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i = 0
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d = {}
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u = chr(0)
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template = _Template(tpl)
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identifiers = template.get_identifiers()
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# map all identifiers as chunks that
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# can be split without losing details
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for k in identifiers:
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d[k] = f"{u}{i}."
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i += 1
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s = template.substitute(d)
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a = s.split(u)
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i = 1
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keys = []
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# create a template after removing chunks
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# leftovers, placing back ordered expected fields
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for k in a[1:]:
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d = k.index(".")
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x = k[0:d]
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keys.append(identifiers[int(x)])
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a[i] = k[(d+1):]
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i += 1
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# make the template immutable
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t = tuple(a)
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return lambda fn, **kw: fn(t, *[kw[k] for k in keys])
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# given a template string, maps all non interpolated
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# parts as tuple and orchestrate ordered values to send
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def _tag(tpl, tags):
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if tags == None: return _create(tpl)
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if not tpl in tags: tags[tpl] = _create(tpl)
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return tags[tpl]

‎test/uhtml/js_template.test.py

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from js_template import tag
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# known = []
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def _flatten(tpl, *values):
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# if not tpl in known:
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# known.append(tpl)
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# print("new template:", "".join(tpl))
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c = []
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for i in range(len(tpl)):
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if i: c.append(str(values[i - 1]))
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c.append(tpl[i])
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return "".join(c)
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# A really not interesting use case such as
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# a generic tag that simply flattens the string
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plain = tag(_flatten, cache={})
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print(plain("this is ${a} ${b} ${a}!", a="one", b="o"))
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print(plain("this is ${a} ${b} ${a}!", a="two", b="o"))
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print(plain("this is ${a} ${b} ${a}!", a="three", b="o"))
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print(
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plain(
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"${a}${b}${c}${d}${e}${f}${g}${h}${i}${j}${k}${a}${b}",
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a="a",
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b="b",
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c="c",
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d="d",
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e="e",
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f="f",
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g="g",
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h="h",
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i="i",
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j="j",
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k="k"
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)
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)

‎test/uhtml/uhtml.py

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from js import uhtml as _uhtml
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from js_template import tag as _tag
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from pyodide.ffi import to_js as _to_js
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_tuples = []
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_arrays = []
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_cache = {}
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# TODO: if values is a callback the to_js creates a proxy of it each time!
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# Find a smart way to re-map *once* callbacks at specific indexes
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# so that we can destroy previous references when needed.
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# Please keep in mind the list of same template but different
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# interpolations values per invoke so that we should also
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# not destroy other elements created via other passed values.
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def _kind(uhtml):
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# hole convention from uhtml, don't @ me :D
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def hole(tpl, *values):
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# this ensures that the passed "template" is
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# always the same reference in the JS side
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if not tpl in _tuples:
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_tuples.append(tpl)
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_arrays.append(_to_js(tpl))
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i = _tuples.index(tpl)
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# I've no idea why this lambda is needed but it works without
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# needing to create_proxy or other things I don't fully understand
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return lambda: uhtml(_arrays[i], *[_to_js(v) for v in values])
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return hole
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# export uhtml API as Python
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html = _tag(_kind(_uhtml.html), cache=_cache)
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svg = _tag(_kind(_uhtml.svg), cache=_cache)
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render = _uhtml.render

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