| Name | minijinja JSON |
| Version |
1.0.16
JSON |
| download |
| home_page | None |
| Summary | An experimental Python binding of the Rust MiniJinja template engine. |
| upload_time | 2024-03-27 19:53:05 |
| maintainer | None |
| docs_url | None |
| author | None |
| requires_python | >=3.8 |
| license | None |
| keywords |
jinja
template-engine
|
| VCS |
 |
| bugtrack_url |
|
| requirements |
No requirements were recorded.
|
| Travis-CI |
No Travis.
|
| coveralls test coverage |
No coveralls.
|
<div align="center">
<img src="https://github.com/mitsuhiko/minijinja/raw/main/artwork/logo.png" alt="" width=320>
<p><strong>MiniJinja for Python: a powerful template engine for Rust and Python</strong></p>
[](https://github.com/mitsuhiko/minijinja/actions?query=workflow%3ATests)
[](https://github.com/mitsuhiko/minijinja/blob/main/LICENSE)
[](https://crates.io/crates/minijinja)
[](https://img.shields.io/badge/rust-1.61%2B-orange.svg)
[](https://docs.rs/minijinja)
</div>
`minijinja-py` is an experimental binding of
[MiniJinja](https://github.com/mitsuhiko/minijinja) to Python. It has somewhat
limited functionality compared to the Rust version. These bindings use
[maturin](https://www.maturin.rs/) and [pyo3](https://pyo3.rs/).
You might want to use MiniJinja instead of Jinja2 when the full feature set
of Jinja2 is not required and you want to have the same rendering experience
of a data set between Rust and Python.
With these bindings MiniJinja can render some Python objects and values
that are passed to templates, but there are clear limitations with regards
to what can be done.
To install MiniJinja for Python you can fetch the package [from PyPI](https://pypi.org/project/minijinja/):
```
$ pip install minijinja
```
## Basic API
The basic API is hidden behind the `Environment` object. It behaves almost entirely
like in `minijinja` with some Python specific changes. For instance instead of
`env.set_debug(True)` you use `env.debug = True`. Additionally instead of using
`add_template` or attaching a `source` you either pass a dictionary of templates
directly to the environment or a `loader` function.
```python
from minijinja import Environment
env = Environment(templates={
"template_name": "Template source"
})
```
To render a template you can use the `render_template` method:
```python
result = env.render_template('template_name', var1="value 1", var2="value 2")
print(result)
```
## Purpose
MiniJinja attempts a certain level of compatibility with Jinja2, but it does not
try to achieve this at all costs. As a result you will notice that quite a few
templates will refuse to render with MiniJinja despite the fact that they probably
look quite innocent. It is however possible to write templates that render to the
same results for both Jinja2 and MiniJinja. This raises the question why you might
want to use MiniJinja.
The main benefit would be to achieve the exact same results in both Rust and Python.
Additionally MiniJinja has a stronger sandbox than Jinja2 and might perform ever so
slightly better in some situations. However you should be aware that due to the
marshalling that needs to happen in either direction there is a certain amount of
loss of information.
## Dynamic Template Loading
MiniJinja's Python bindings inherit the underlying behavior of how MiniJinja loads
templates. Templates are loaded on first use and then cached. The templates are
loaded via a loader. To trigger a reload you can call `env.reload()` or
alternatively set `env.reload_before_render` to `True`.
```python
def my_loader(name):
segments = []
for segment in name.split("/"):
if "\\" in segment or segment in (".", ".."):
return None
segments.append(segment)
try:
with open(os.path.join(TEMPLATES, *segments)) as f:
return f.read()
except (IOError, OSError):
pass
env = Environment(loader=my_loader)
env.reload_before_render = True
print(env.render_template("index.html"))
```
Alternatively templates can manually be loaded and unloaded with `env.add_template`
and `env.remove_template`.
## Auto Escaping
The default behavior is to use auto escaping file files ending in `.html`. You can
customize this behavior by overriding the `auto_escape_callback`:
```python
env = Environment(auto_escape_callback=lambda x: x.endswith((".html", ".foo")))
```
MiniJinja uses [markupsafe](https://github.com/pallets/markupsafe) if it's available
on the Python side. It will honor `__html__`.
## Finalizers
Instead of custom formatters like in MiniJinja, you can define a finalizer instead
which is similar to how it works in Jinja2. It's passed a value (or optional also
the state as first argument when `pass_state` is used) and can return a new value.
If the special `NotImplemented` value is returned, the original value is rendered
without any modification:
```
from minijinja import Environment
def finalizer(value):
if value is None:
return ""
return NotImplemented
env = Environment(finalizer=finalizer)
assert env.render_str("{{ none }}") == ""
```
## State Access
Functions passed to the environment such as filters or global functions can
optionally have the template state passed by using the `pass_state` parameter.
This is similar to `pass_context` in Jinja2. It can be used to look at the
name of the template or to look up variables in the context.
```python
from minijinja import pass_state
@pass_state
def my_filter(state, value):
return state.lookup("a_variable") + value
env.add_filter("add_a_variable", my_filter)
```
## Runtime Behavior
MiniJinja uses it's own runtime model which is not matching the Python
runtime model. As a result there are clear gaps in behavior between the
two and only limited effort is made to bridge them. For instance you will
be able to call some methods of types, but for instance builtins such as
dicts and lists do not expose their methods on the MiniJinja side. This
means that it's very intentional that if you pass a dictionary to MiniJinja,
the Python `.items()` method is unavailable.
Here is what this means for some basic types:
* Python dictionaries and lists (as well as other objects that behave as sequences)
appear in the MiniJinja side as native lists. They do not expose any specific
other behavior and when they move back to the Python side they will appear as basic
lists. Specifically this means that a tuple (which does not exist in MiniJinja)
when moving from Python to MiniJinja turns into a list and will remain a list when
it moves back.
* Python objects are represented in MiniJinja similarly to dicts, but they retain all
their meaningful Python APIs. This means they stringify via `__str__` and they
allow the MiniJinja code to call their non-underscored methods. Note that there is
no extra security layer in use at the moment so take care of what you pass there.
* MiniJinja's python binding understand what `__html__` is when it exists on a string
subclass. This means that a `markupsafe.Markup` object will appear as safe string in
MiniJinja. This information can also flow back to Python again.
## Sponsor
If you like the project and find it useful you can [become a
sponsor](https://github.com/sponsors/mitsuhiko).
## License and Links
- [Documentation](https://docs.rs/minijinja/)
- [Examples](https://github.com/mitsuhiko/minijinja/tree/main/examples)
- [Issue Tracker](https://github.com/mitsuhiko/minijinja/issues)
- [MiniJinja Playground](https://mitsuhiko.github.io/minijinja-playground/)
- License: [Apache-2.0](https://github.com/mitsuhiko/minijinja/blob/main/LICENSE)
Raw data
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"description": "<div align=\"center\">\n <img src=\"https://github.com/mitsuhiko/minijinja/raw/main/artwork/logo.png\" alt=\"\" width=320>\n <p><strong>MiniJinja for Python: a powerful template engine for Rust and Python</strong></p>\n\n[](https://github.com/mitsuhiko/minijinja/actions?query=workflow%3ATests)\n[](https://github.com/mitsuhiko/minijinja/blob/main/LICENSE)\n[](https://crates.io/crates/minijinja)\n[](https://img.shields.io/badge/rust-1.61%2B-orange.svg)\n[](https://docs.rs/minijinja)\n\n</div>\n\n`minijinja-py` is an experimental binding of\n[MiniJinja](https://github.com/mitsuhiko/minijinja) to Python. It has somewhat\nlimited functionality compared to the Rust version. These bindings use\n[maturin](https://www.maturin.rs/) and [pyo3](https://pyo3.rs/).\n\nYou might want to use MiniJinja instead of Jinja2 when the full feature set\nof Jinja2 is not required and you want to have the same rendering experience\nof a data set between Rust and Python.\n\nWith these bindings MiniJinja can render some Python objects and values\nthat are passed to templates, but there are clear limitations with regards\nto what can be done.\n\nTo install MiniJinja for Python you can fetch the package [from PyPI](https://pypi.org/project/minijinja/):\n\n```\n$ pip install minijinja\n```\n\n## Basic API\n\nThe basic API is hidden behind the `Environment` object. It behaves almost entirely\nlike in `minijinja` with some Python specific changes. For instance instead of\n`env.set_debug(True)` you use `env.debug = True`. Additionally instead of using\n`add_template` or attaching a `source` you either pass a dictionary of templates\ndirectly to the environment or a `loader` function.\n\n```python\nfrom minijinja import Environment\n\nenv = Environment(templates={\n \"template_name\": \"Template source\"\n})\n```\n\nTo render a template you can use the `render_template` method:\n\n```python\nresult = env.render_template('template_name', var1=\"value 1\", var2=\"value 2\")\nprint(result)\n```\n\n## Purpose\n\nMiniJinja attempts a certain level of compatibility with Jinja2, but it does not\ntry to achieve this at all costs. As a result you will notice that quite a few\ntemplates will refuse to render with MiniJinja despite the fact that they probably\nlook quite innocent. It is however possible to write templates that render to the\nsame results for both Jinja2 and MiniJinja. This raises the question why you might\nwant to use MiniJinja.\n\nThe main benefit would be to achieve the exact same results in both Rust and Python.\nAdditionally MiniJinja has a stronger sandbox than Jinja2 and might perform ever so\nslightly better in some situations. However you should be aware that due to the\nmarshalling that needs to happen in either direction there is a certain amount of\nloss of information.\n\n## Dynamic Template Loading\n\nMiniJinja's Python bindings inherit the underlying behavior of how MiniJinja loads\ntemplates. Templates are loaded on first use and then cached. The templates are\nloaded via a loader. To trigger a reload you can call `env.reload()` or\nalternatively set `env.reload_before_render` to `True`.\n\n```python\ndef my_loader(name):\n segments = []\n for segment in name.split(\"/\"):\n if \"\\\\\" in segment or segment in (\".\", \"..\"):\n return None\n segments.append(segment)\n try:\n with open(os.path.join(TEMPLATES, *segments)) as f:\n return f.read()\n except (IOError, OSError):\n pass\n\nenv = Environment(loader=my_loader)\nenv.reload_before_render = True\nprint(env.render_template(\"index.html\"))\n```\n\nAlternatively templates can manually be loaded and unloaded with `env.add_template`\nand `env.remove_template`.\n\n## Auto Escaping\n\nThe default behavior is to use auto escaping file files ending in `.html`. You can\ncustomize this behavior by overriding the `auto_escape_callback`:\n\n```python\nenv = Environment(auto_escape_callback=lambda x: x.endswith((\".html\", \".foo\")))\n```\n\nMiniJinja uses [markupsafe](https://github.com/pallets/markupsafe) if it's available\non the Python side. It will honor `__html__`.\n\n## Finalizers\n\nInstead of custom formatters like in MiniJinja, you can define a finalizer instead\nwhich is similar to how it works in Jinja2. It's passed a value (or optional also\nthe state as first argument when `pass_state` is used) and can return a new value.\nIf the special `NotImplemented` value is returned, the original value is rendered\nwithout any modification:\n\n```\nfrom minijinja import Environment\n\ndef finalizer(value):\n if value is None:\n\treturn \"\"\n return NotImplemented\n\nenv = Environment(finalizer=finalizer)\nassert env.render_str(\"{{ none }}\") == \"\"\n```\n\n## State Access\n\nFunctions passed to the environment such as filters or global functions can\noptionally have the template state passed by using the `pass_state` parameter.\nThis is similar to `pass_context` in Jinja2. 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