Pyparsing 实现一个简单的脚本命令

发布于 2024-12-28 22:09:26 字数 361 浏览 1 评论 0原文

我需要实现一个非常简单的语法来解析从文件中读取的简单命令语言。我想使用 PyParsing ：

输入文件中的示例命令：

## comment line - skip to next
CopyFile c:\temp\file1.txt  c:\temp\file2.txt
CreateDir "Junk"
MoveFile c:\temp\file1.txt  c:\temp\file2.txt
CreateFolder "Name"
DeleteFolder "Name"
FolderStruct "startNode"
FolderList "folderName"

理想情况下，解析的结果将是命令后跟可选参数。

原文

I need to implement a very simple grammar to parse a simple command language that would be read from a file. I would like to use PyParsing :

Example commands in input file :

## comment line - skip to next
CopyFile c:\temp\file1.txt  c:\temp\file2.txt
CreateDir "Junk"
MoveFile c:\temp\file1.txt  c:\temp\file2.txt
CreateFolder "Name"
DeleteFolder "Name"
FolderStruct "startNode"
FolderList "folderName"

Ideally, the result of the parsing would be the command followed by the optional arguments.

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再浓的妆也掩不了殇 2025-01-04 22:09:26

请参阅我在 Pyparsing wiki 讨论页面上回答此问题的示例形状解析语法： http:// /pyparsing.wikispaces.com/message/view/home/49369254。每个语法构造都映射到可以从解析的标记构造的类类型。完成后，您将有效地将输入文本反序列化为类实例列表，这些实例本身可以使用 execute 或 __call__ 方法定义来执行所需的任务。您可以在 pyparsing wiki 示例页面的 SimpleBool.py 示例中查看更多示例。另请参阅我在 PyCon '06 上展示的示例冒险游戏解析器，您可以在 http: //www.ptmcg.com/geo/python/index.html。

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东京女 2025-01-04 22:09:26

要将字符串拆分为参数列表，类似于 Unix shell 的操作方式，您可以使用 shlex module:

import fileinput
from shlex import shlex

def split(s):
    lex = shlex(s, posix=True)
    lex.escape = '' # treat all characters including backslash '\' literally
    lex.whitespace_split = True
    return list(lex)

for line in fileinput.input():
    args = split(line)
    if args:
       print(args)

输出

每个列表中的第一项是命令，其余是选项：

['CopyFile', 'c:\\temp\\file1.txt', 'c:\\temp\\file2.txt']
['CreateDir', 'Junk']
['MoveFile', 'c:\\temp\\file1.txt', 'c:\\temp\\file2.txt']
['CreateFolder', 'Name']
['DeleteFolder', 'Name']
['FolderStruct', 'startNode']
['FolderList', 'folderName']

To split a string into an argument list similar to how the Unix shell does it you could use shlex module:

import fileinput
from shlex import shlex

def split(s):
    lex = shlex(s, posix=True)
    lex.escape = '' # treat all characters including backslash '\' literally
    lex.whitespace_split = True
    return list(lex)

for line in fileinput.input():
    args = split(line)
    if args:
       print(args)

Output

The first item in each list is a command, the rest are options:

['CopyFile', 'c:\\temp\\file1.txt', 'c:\\temp\\file2.txt']
['CreateDir', 'Junk']
['MoveFile', 'c:\\temp\\file1.txt', 'c:\\temp\\file2.txt']
['CreateFolder', 'Name']
['DeleteFolder', 'Name']
['FolderStruct', 'startNode']
['FolderList', 'folderName']

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