Question

您好我是PowerShell的新手并且正在探索它。

要求：我有以下结构的多个：

SAGENT EXPORT FILE
VERSION 18
LOCALE_INFO "1252",".","","-",".".
BEGIN PLAN
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      source_output_no=0
      dest_input_no=0
    END ATTRIBUTES
    SOURCE_STEP=6210134672605708291
    DESTINATION_STEP=6210134672605708292
  END FLOW 6210134672605708290
  BEGIN FLOW 3
    BEGIN ATTRIBUTES
      name=Flow
      source_output_no=0
      dest_input_no=0
    END ATTRIBUTES
    SOURCE_STEP=6210134672605708292
    DESTINATION_STEP=6210134672605708293
  END FLOW 6210134672605708291
  BEGIN FLOW 4
    BEGIN ATTRIBUTES
      name=Flow
      source_output_no=0
      dest_input_no=0
    END ATTRIBUTES
    SOURCE_STEP=6210134672605708293
    DESTINATION_STEP=6210134672605708294
  END FLOW 6210134672605708292
END PLAN
END

现在我需要扫描所有文件并检查过滤器部分中缺少哪个部分，因为会有两种情况，即下面部分将可用或将丢失

BEGIN VECTOR val_string val_string_pos
  [1]=Abc
  [1]=0
END VECTOR

以上部分将始终位于“过滤步骤”下，但步骤编号可能会有所不同

以下是我的计划：

搜索关键字过滤器
如果成功找到模式
```
BEGIN STEP 5
     BEGIN ATTRIBUTE
         name = filter
```
（注意数字5因不同的文件而异，我想保存在临时变量中说x）
搜索END step(x)并保存在y
现在搜索

BEGIN VECTOR val_string val_string_pos [1]=Abc [1]=0 END VECTOR

在上限和下限之间x和y
如果找到，请将变量中的文件名保存到列表中以获取所有此类计划，其中包含哪些计划

我不确定接下来的方法。任何指导将不胜感激

Answer 1

在为这些格式编写解析代码时，我发现在许多情况下，使用switch -Regex是一种很好的方法。您在解析期间将状态保存在各种变量中，并根据行匹配的正则表达式输入不同的大小写。

这样的事情：

filter Add-Property ($name, $value) {
    $_ | Add-Member NoteProperty $name $value
}

switch -regex ($fileName) {
    '^SAGENT EXPORT FILE$' {
        # file start
        $file = New-Object PSObject
    }
    '^VERSION (\d+)$' {
        $file | Add-Property Version ([int]$Matches[1])
    }
    # ...
    '^BEGIN PLAN$' {
        $plan = New-Object PSObject
        $context = $plan
    }
    '^\s+BEGIN ATTRIBUTES$' {
        $attr = New-Object PSObject
    }
    'name=(.*)' {
        $attr | Add-Property Name ($Matches[1])
    }
    # ...
    '^\s+END ATTRIBUTES$' {
        $context | Add-Property Attributes $attr
    }
    # ...
    '^END PLAN$' {
        $file | Add-Property Plan $plan
    }
}

如果有了这些，您可以在结构中查找搜索内容。 PowerShell的管道在处理对象（我们在上面构建）时非常容易。 E.g。

$matchingFiles = $files |
                 where {
                    $_.Plan.Steps | % { $_.Properties } | % { $_.Attributes } |
                    where { $_ -is [array] }
                 }

或类似的东西。这有点取决于你如何解析向量。出于此任务的目的，您当然可以向属性添加属性，无论它们是否具有向量。

Answer 2

另一种可能性是将文件解析为多行字符串：

[regex]$filter_match = 
@'
(?ms)\s*BEGIN STEP (\d+)\s*
\s*BEGIN ATTRIBUTES\s*
\s*name=Filter\s*
.+?
\s*(END STEP \d+)
'@

$vector_match = 
@'
(?ms)\s*BEGIN VECTOR val_string val_string_pos\s*
\s*\[1\]=Abc\s*
\s*\[1\]=0\s*
\s*END VECTOR\s*
'@

$text = get-content  testfile.txt -raw

$filter_match.Matches($text) | 
foreach {
$x =  $_.groups[1].value
$y = $_.groups[2].value
$HasVector = $_.groups[0].value -match $vector_match

$x
$y
$HasVector

 }


5
END STEP 5
True

在Powershell中搜索文本

2 个答案: