Jinja2 模版引擎 代码生成

 

广泛用于生成各种模版代码

Jinja — Jinja Documentation (3.1.x) (palletsprojects.com)

 

https://jinja.palletsprojects.com/en/3.1.x/switching/

 

JinJa2 是一个 Python 实现的模板引擎

Jinja2 是一个现代的，设计者友好的，仿照 Django 模板的 Python 模板语言。 它速度快，被广泛使用，并且提供了可选的沙箱模板执行环境保证安全

 

 

Jinja is a fast, expressive, extensible templating engine. Special placeholders in the template allow writing code similar to Python syntax. Then the template is passed data to render the final document.

 

 

其他模板引擎 StringTemplate

https://docs.python.org/3/library/string.html#template-strings

 

 

https://github.com/jinja2cpp/Jinja2Cpp

Jinja2С++

C++ implementation of the Jinja2 Python template engine. This library brings support of powerful Jinja2 template features into the C++ world, reports dynamic HTML pages and source code generation.

 Jinja2C++ is a modern C++ implementation of the Python’s Jinja2 template engine.
This project was inspired by Jinja2CppLight library.

 

 pantor::inja

Inja is a template engine for modern C++, loosely inspired by jinja for python. It has an easy and yet powerful template syntax with all variables, loops, conditions, includes, callbacks, and comments you need, nested and combined as you like. Inja uses the wonderful json library by nlohmann for data input. Most importantly, inja needs only two header files, which is (nearly) as trivial as integration in C++ can get. Of course, everything is tested on all relevant compilers. Here is what it looks like:

 

 

Welcome to the C++ CTemplate system!

This library provides an easy to use and lightning fast text templating system to use with C++ programs.

It was originally called Google Templates, due to its origin as the template system used for Google search result pages. Now it has a more general name matching its community-owned nature.

https://github.com/OlafvdSpek/ctemplate

 

 

 

Comparison with other implementations

Feature	Jinja2C++	Jinja2CppLight	pantor::inja	Python Jinja2
More information		see [1]	see [2]	see [3]
{{ / }}	yes	yes	yes	yes
{% / %}	yes	yes	yes	yes
{# / #}	yes	yes	yes	yes
Single-line statements	no	no	yes	yes
raw/endraw	yes	no	no	yes
Whitespace control	yes	no	yes	yes
Statements
set	yes	no	no	yes
block set	yes	no	no	yes
if / endif	yes	yes	yes	yes
else	yes	no	yes	yes
elif	yes	no	no	yes
for / endfor	yes	yes	yes	yes
recursive for loop	yes	no	no	yes
conditional for loop	yes	no	no	yes
extends / block	yes	no	no	yes
import	yes	no	no	yes
include	yes	no	yes	yes
macro / endmacro	yes	no	no	yes
call	yes	no	no	yes
filter	yes	no	no	yes
do (extension)	yes	no	no	yes
with (extension)	yes	no	no	yes
i18n (extension)	no	no	no	yes
continue/break (extension)	no	no	no	yes
autoescape (extension)	no	no	no	yes
Expressions
String literals	yes	yes	yes	yes
Integer numbers	yes	yes	yes	yes
Floating numbers	yes	yes	yes	yes
Lists ([1, 3, 4])	yes	no	no	yes
Tuples ((1, "one", 3.14))	yes	no	no	yes
Dicts ({'dict': 'of', 'key': 'and', 'value': 'pairs'})	yes	no	no	yes
True / False	yes	no	no	yes
+ operator	yes	no	no	yes
- operator	yes	no	no	yes
/ operator	yes	no	no	yes
// operator	yes	no	no	yes
% operator	yes	no	no	yes
* operator	yes	no	no	yes
** operator	yes	no	no	yes
== operator	yes	yes	yes	yes
!= operator	yes	yes	yes	yes
> / < / >= / <= operators	yes	yes	yes	yes
and / or / not logical operators	yes	no	yes	yes
in operator	yes	no	yes	yes
is operator	yes	no	no	yes
| (filter application operator)	yes	no	no	yes
~ (string concatenation operator)	yes	no	no	yes
() (call operator)	yes	no	yes	yes
. (attribute access)	yes	no	yes	yes
[] (attribute access)	yes	no	no	yes
[] (arrays slicing)	no	no	no	yes
Filters
abs	yes	no	no	yes
attr	yes	no	no	yes
batch	yes	no	no	yes
capitalize	yes	no	no	yes
center	no	no	no	yes
default	yes	no	yes (as function)	yes
dictsort	yes	no	no	yes
escape	yes	no	no	yes
filesizeformat	no	no	no	yes
first	yes	no	yes (as function)	yes
float	yes	no	yes (as function)	yes
forceescape	no	no	no	yes
format	yes	no	no	yes
groupby	yes	no	no	yes
indent	no	no	no	yes
int	yes	no	yes (as function)	yes
join	yes	no	no	yes
last	yes	no	yes (as function)	yes
length	yes	no	yes (as function)	yes
list	yes	no	no	yes
lower	yes	no	yes (as function)	yes
map	yes	no	no	yes
max	yes	no	no	yes
min	yes	no	no	yes
pprint	yes	no	no	yes
random	yes	no	no	yes
reject	yes	no	no	yes
rejectattr	yes	no	no	yes
replace	yes	no	no	yes
reverse	yes	no	no	yes
round	yes	no	yes (as function)	yes
safe	no	no	no	yes
select	yes	no	no	yes
selectattr	yes	no	no	yes
slice	yes	no	no	yes
sort	yes	no	yes (as function)	yes
string	yes	no	yes (as function)	yes
striptags	no	no	no	yes
sum	yes	no	no	yes
title	yes	no	no	yes
tojson	no	no	no	yes
trim	yes	no	no	yes
truncate	yes	no	no	yes
unique	yes	no	no	yes
upper	yes	no	yes (as function)	yes
urlencode	yes	no	no	yes
urlize	yes	no	no	yes
wordcount	yes	no	no	yes
wordwrap	yes	no	no	yes
Testers
callable	no	no	no	yes
defined	yes	no	yes (as function)	yes
devisibleby	no	no	yes (as function)	yes
eq	yes	no	no	yes
escaped	no	no	no	yes
even	yes	no	yes (as function)	yes
ge	yes	no	no	yes
gt	yes	no	no	yes
in	yes	no	no	yes
iterable	yes	no	no	yes
le	yes	no	no	yes
lower	yes	no	no	yes
lt	yes	no	no	yes
mapping	yes	no	yes (as function)	yes
ne	yes	no	no	yes
none	no	no	no	yes
number	yes	no	yes (as function)	yes
odd	yes	no	no	yes
sameas	no	no	no	yes
sequence	yes	no	yes (as function)	yes
string	yes	no	yes (as function)	yes
undefined	yes	no	no	yes
upper	yes	no	no	yes
Global functions and classes
range	yes	no	yes (as function)	yes
lipsum	no	no	no	yes
dict	no	no	no	yes
cycler	no	no	no	yes
joiner	no	no	no	yes
namespace	no	no	no	yes

References

• [1] https://github.com/hughperkins/Jinja2CppLight
• [2] https://github.com/pantor/inja
• [3] https://jinja.palletsprojects.com/en/2.10.x/