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一曲忠臣的战歌 / not_so_free_marker

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README
Apache-2.0

NotSoFreeMarker

本工具通过设定模板和数据,渲染最终的文本.其中模板的支持if,循环和简单的运算.可用于生成复杂的代码,数据表格等,减少手工劳动.

调用方式

本工具的目标场景是读取数据文件和模板文件进行处理.模板和数据分别重复使用,组合生成不同的文件(如读取不同表的列,生成pojo和model的代码).这样也便于其它语言调用.此外还提供了基于文本和数据字典的调用,便于python语言调用.


import NotSoFreeMarker

processed_str = NotSoFreeMarker.process(模板的内容,用于渲染的数据[map类型],include文件的路径[可选])

processed_str = NotSoFreeMarker.process_file(模板文件路径,json数据文件路径)

数据格式

如果是数据文件,格式应该是json.注意,由于python语言的原因,对json的要求比较严格.如属性的名字必须用引号括起来等.

另外,数据的根结构不能是数组.如果要用数组,需要放在某个属性下,如:

//不可以
[
    1,2,3,4
]
//可以
{
    "array":[1,2,3,4]
}

如果直接输入数据,数据应该是map类型.map中,可以嵌套map,数组.

模板

模板的语法使用类似freemarker(后悔当初没借鉴velocity的,感觉那个实现更简单),支持变量,循环,条件,和简单的表达式.

这里是例子数据,后面的例子都基于这个:

{
    "a":1,
    "b":2,
    "c":[10,20,30],
    "d":{
        "e":"abc",
        "f":"efg"
    }
}

变量

变量采用${变量名的格式},例如

  • ${a}
  • ${c[0]}
  • ${d.e}

另外变量这里支持简单的表达式,支持的范围以python能解析为准,比如

  • ${a+b}
  • ${c[10]+5*a}
  • ${len(d.f)} //len是python里取长度的函数

函数

写变量的时候,支持简单的函数,如刚才提到的

  • ${len(d.f)} //len是python里取长度的函数

但是,由于实现的比较简单.只支持"函数名(变量)"这样简单的函数.因此.如果要对内容进行深入一点的加工就不行了(比如想把内容变为大写,写成${内容.upper()}是不行的.因为代码无法识别这样的函数.)

为了解决这个问题,我写了几个内置函数,封装了常见的操作.他们都是用nsfm开头的.如${nsfm_upper(变量)},这种写法可以把变量的内容变为大写.

这些函数有:

  • nsfm_lower 变为小写
  • nsfm_upper 变为大写

只支持"函数名(变量)"这样简单的函数的原因:函数书写比较自由,如a.b.c(e.f.g),这其中,a.b.c或者e.f.g都有可能是变量,也可能是某个函数(如os.path.abspath) 设计的时候这里考虑的不周到.因而有一些bug.为了可用性起见.还是粗暴的用目前的方式来实现.等有时间了再改进.

循环

循环采用一对<#list>标签.

写法

<#list d as item>
    ${item}
<#/list>
输出为:
10
20
30

如果想要在循环中使用索引,可以加上index变量,写法为

<#list items as (item,index)>
    ${item},${index}
<#/list>

输出为:
10,0
20,1
30,2

条件

条件支持if,elseif,else,

写法:

<#if a>0 >
    a大于0
<#elseif a<=0 and a>-1>
    a在0和-1之间
<#else>
    a小于-1
</#if>

其中,<#if>和</#if>都必须存在,剩下两个标签可选

引用

模板还支持引入另外一个文件,这样可以把模板里公共的部分放到另外一个文件中.

<#include "文件路径">

注释

在模板中添加的注释,不会被渲染到结果中。

注释支持多行,注意<#--和-->中,尖括号与#和--之间,不可以有空格。

另外注释不支持嵌套

<#--
多行注释
-->

<#--单行注释-->

<#--
    <#--这样嵌套的注释是不可以的-->
-->
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简介

依照java freemarker的语法,实现一个python版本的模板渲染工具,用于根据需要生成本文,CSV,代码等等。因为功能相比于freemarker少很多,所以叫not so free marker 展开 收起
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