python - Pyparsing 缩进和去缩进

Question

我正在解析路由器的配置文件。通常我将正则表达式与命名组一起使用，为此目的： https : //regex101.com/r/EcyPeh/5 在此示例中，我使用“svcindent”命名组+关键字“exit”作为服务配置上下文的缩进。

如何用 pyparsing 做同样的事情？

以下源代码中有SkipTo(intend + Keyword("exit")。我试图将它用作de-indent。但它匹配各种数量的空格。这就是它匹配stp上下文的“exit”关键字的原因.

from pyparsing import *

data = """
        vpls 82 customer 700 i-vpls create
            service-mtu 9040
            send-flush-on-failure
            propagate-mac-flush
            stp
                shutdown
            exit
            sap 2/2/8:0.1 create
                ingress
                    qos 13
                    queue-override
                        queue 1 create
                            cbs 1000
                            rate 10240 cir 10240
                        exit
                    exit
                exit
            exit
            spoke-sdp 4:82 endpoint "vpls-82-uplink" create
                stp
                    shutdown
                exit
                precedence primary
                no shutdown
            exit
            spoke-sdp 6:82 endpoint "vpls-82-uplink" create
                stp
                    shutdown
                exit
                no shutdown
            exit
            mac-move
                no shutdown
            exit
            no shutdown
        exit
        vpls 121 customer 700 i-vpls create
            service-mtu 9040
            send-flush-on-failure
            propagate-mac-flush
            stp
                shutdown
            exit
            sap 2/2/9:900 create
                ingress
                    qos 13
                    queue-override
                        queue 1 create
                            cbs 3000
                            rate 10240 cir 10240
                        exit
                    exit
                exit
            exit
            spoke-sdp 4:121 endpoint "vpls-121-uplink" create
                stp
                    shutdown
                exit
                precedence primary
                no shutdown
            exit
            spoke-sdp 6:121 endpoint "vpls-121-uplink" create
                stp
                    shutdown
                exit
                no shutdown
            exit
            mac-move
                no shutdown
            exit
            no shutdown
        exit
        vpls 1986692 customer 555 i-vpls create
            service-mtu 9040
            send-flush-on-failure
            propagate-mac-flush
            stp
                shutdown
            exit
            sap 2/2/9:130 create
                ingress
                    qos 13
                    queue-override
                        queue 1 create
                            cbs 1000
                            rate 10240 cir 10240
                        exit
                    exit
                exit
            exit
            spoke-sdp 4:1986692 endpoint "vpls-1986692-uplink" create
                stp
                    shutdown
                exit
                precedence primary
                no shutdown
            exit
            spoke-sdp 6:1986692 endpoint "vpls-1986692-uplink" create
                stp
                    shutdown
                exit
                no shutdown
            exit
            mac-move
                no shutdown
            exit
            no shutdown
        exit
"""
indent = LineStart() + OneOrMore(White(' ', exact=4))
deident = matchPreviousExpr(indent) + Keyword("exit")
svc_id = Word(nums)
customer_id = Word(nums)
sp = White(' ', exact=1)
svc_stmt = Combine(indent("int_s") + Keyword("vpls") + sp + svc_id + sp + Keyword("customer") + sp + customer_id + SkipTo(Keyword("create"), include=True)) + Combine(SkipTo(deident, include=True))

svc_stmt.leaveWhitespace()
parseTree = svc_stmt.searchString(data)
parseTree.pprint()



Result:
[['        vpls 82 customer 700 i-vpls create',
'\n'
'            service-mtu 9040\n'
'            send-flush-on-failure\n'
'            propagate-mac-flush\n'
'            stp\n'
'                shutdown\n'
'            exit'],
['        vpls 121 customer 700 i-vpls create',
'\n'
'            service-mtu 9040\n'
'            send-flush-on-failure\n'
'            propagate-mac-flush\n'
'            stp\n'
'                shutdown\n'
'            exit'],
['        vpls 1986692 customer 555 i-vpls create',
'\n'
'            service-mtu 9040\n'
'            send-flush-on-failure\n'
'            propagate-mac-flush\n'
'            stp\n'
'                shutdown\n'
'            exit']]

标签： pythonregexpyparsing