Robot Framework 源码阅读 day1 __main__.py

robot文件夹下的__main__.py函数 是使用module运行时的入口函数：

 import sys

 # Allows running as a script. __name__ check needed with multiprocessing:
 # https://github.com/robotframework/robotframework/issues/1137
 if 'robot' not in sys.modules and __name__ == '__main__':
     import pythonpathsetter

 from robot import run_cli

 run_cli(sys.argv[1:])

STEP 1.
if 'robot' not in sys.modules and __name__ == '__main__':

[explain]: 如果robot module包含在sys.modules 中则import pythonpathsetter 模块

STEP 2.

import pythonpathsetter
[explain]: 这个模块的朱啊哟作用是保证用户在引用时以module的形式进行引用，
不能直接引用内部脚本

　pythonpathsetter.py

 import sys
 import fnmatch
 from os.path import abspath, dirname

 ROBOTDIR = dirname(abspath(__file__))

 def add_path(path, end=False):
     if not end:
         remove_path(path)
         sys.path.insert(0, path)
     elif not any(fnmatch.fnmatch(p, path) for p in sys.path):
         sys.path.append(path)

 def remove_path(path):
     sys.path = [p for p in sys.path if not fnmatch.fnmatch(p, path)]

 # When, for example, robot/run.py is executed as a script, the directory
 # containing the robot module is not added to sys.path automatically but
 # the robot directory itself is. Former is added to allow importing
 # the module and the latter removed to prevent accidentally importing
 # internal modules directly.
 add_path(dirname(ROBOTDIR)) #或者去pythonpathsetter.py的上级目录， 加到sys.path中， 供导入模块使用
 remove_path(ROBOTDIR)  #从sys.path 中删除掉pythonpathsetter.py文件所在的目录， 防止内部脚本被直接应用

[ps]:

abspath 返回文件所在的绝对路径

dirname 返回上一级路径

abspath("monitor.log")
'E:\\Software\\Software\\Python2.7.11\\Lib\\site-packages\\robot\\monitor.log'
ap = abspath("monitor.log")
dp = dirname(ap)
dp
'E:\\Software\\Software\\Python2.7.11\\Lib\\site-packages\\robot'

STEP 3.

 from robot import run_cli

 run_cli(sys.argv[1:])
从模块中导入run_cli函数供采集运行module时传入的参数

E:\Software\Software\Python2.7.11\Lib\site-packages\robot>python -m robot --help
*** cli_arguments *** ['--help']
Robot Framework -- A generic test automation framework

Version:  3.0 (Python 2.7.11 on win32)

Usage:  robot [options] data_sources
   or:  python -m robot [options] data_sources
   or:  python path/to/robot [options] data_sources
   or:  java -jar robotframework.jar [options] data_sources
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