pyparsing problem

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  • name
    #1

    pyparsing problem

    Hi,

    I try to parse a file with pyparsing and get this output:

    ['generic', 'host-01', 'host alias xyz', '10.0.0.1']
    - alias: host alias xyz
    - host_name: ['host-01']
    - ip_address: ['10.0.0.1']
    - use: ['generic']


    <Hosts>
    <ITEM>generic </ITEM>
    <host_name>ho st-01</host_name>
    <alias>host alias xyz</alias>
    <ip_address>10. 0.0.1</ip_address>
    </Hosts>

    ['generic', 'host-01', 'host alias xyz', '10.0.0.1']

    finished

    What I don't understand is why I get the line

    <ITEM>generic </ITEM>

    and not

    <use>generic</use>

    as there is an associated name in the dump() output.

    Thank you very much in advance for any clue or help you could
    provide.



    The code:
    ---------

    #!/usr/bin/env python

    from pyparsing import *

    sample = """
    define host{
    use generic
    host_name host-01
    alias host alias xyz
    address 10.0.0.1
    }
    """

    # define tokens
    LBRACE,RBRACE = map(Suppress, '{}')
    ipAddress = Combine(Word(nu ms) + ('.' + Word(nums))*3)
    useTemplate = oneOf('generic user')

    # define grammar

    deviceName = Word(alphanums+ '-')
    hostDef = Literal('define ').suppress() + Literal('host') .suppress()
    useLine = Suppress('use') + useTemplate + Suppress(SkipTo (lineEnd))
    host_nameLine = Suppress('host_ name') + deviceName + Suppress(SkipTo
    (lineEnd))
    aliasLine = Suppress('alias ') + SkipTo(lineEnd)
    aliasLine.setPa rseAction(lambd a x: ' '.join(x[0].split()))
    ip_addressLine = Suppress('addre ss') + ipAddress

    use = useLine.setResu ltsName('use')
    host_name = host_nameLine.s etResultsName(' host_name')
    alias = aliasLine.setRe sultsName('alia s')
    ip_address = ip_addressLine. setResultsName( 'ip_address')


    host_stmt = (use + host_name + alias + ip_address)
    host = hostDef + LBRACE + host_stmt + RBRACE

    test_file = OneOrMore(host) + stringEnd


    # test
    x = test_file.parse String(sample)
    print x.dump()
    print
    print x.asXML('Hosts' )
    print
    print x.asList()
    print

    print 'finished'

    Tags: None
    • Paul McGuire
      #2
      Re: pyparsing problem

      On Jul 1, 8:02 am, name <x...@y.zwrot e:
      Hi,
      >
      I try to parse a file with pyparsing and get this output:
      >
          ['generic', 'host-01', 'host alias xyz', '10.0.0.1']
          - alias: host alias xyz
          - host_name: ['host-01']
          - ip_address: ['10.0.0.1']
          - use: ['generic']
      >
          <Hosts>
            <ITEM>generic </ITEM>
            <host_name>ho st-01</host_name>
            <alias>host alias xyz</alias>
            <ip_address>10. 0.0.1</ip_address>
          </Hosts>
      >
          ['generic', 'host-01', 'host alias xyz', '10.0.0.1']
      >
          finished
      >
      What I don't understand is why I get the line
      >
          <ITEM>generic </ITEM>
      >
      and not
      >
          <use>generic</use>
      >
      as there is an associated name in the dump() output.
      >
      Thank you very much in advance for any clue or help you could
      provide.
      >
      The code:
      ---------
      >
      #!/usr/bin/env python
      >
      from pyparsing import *
      >
      sample = """
      define host{
        use                   generic
        host_name             host-01
        alias                 host alias xyz
        address                       10.0.0.1}
      >
      """
      >
      # define tokens
      LBRACE,RBRACE = map(Suppress, '{}')
      ipAddress = Combine(Word(nu ms) + ('.' + Word(nums))*3)
      useTemplate = oneOf('generic user')
      >
      # define grammar
      >
      deviceName = Word(alphanums+ '-')
      hostDef = Literal('define ').suppress() + Literal('host') .suppress()
      useLine = Suppress('use') + useTemplate + Suppress(SkipTo (lineEnd))
      host_nameLine = Suppress('host_ name') + deviceName + Suppress(SkipTo
      (lineEnd))
      aliasLine = Suppress('alias ') + SkipTo(lineEnd)
      aliasLine.setPa rseAction(lambd a x: ' '.join(x[0].split()))
      ip_addressLine = Suppress('addre ss') + ipAddress
      >
      use = useLine.setResu ltsName('use')
      host_name = host_nameLine.s etResultsName(' host_name')
      alias = aliasLine.setRe sultsName('alia s')
      ip_address = ip_addressLine. setResultsName( 'ip_address')
      >
      host_stmt = (use + host_name + alias + ip_address)
      host = hostDef + LBRACE + host_stmt  + RBRACE
      >
      test_file = OneOrMore(host) + stringEnd
      >
      # test
      x = test_file.parse String(sample)
      print x.dump()
      print
      print x.asXML('Hosts' )
      print
      print x.asList()
      print
      >
      print 'finished'
      Looks like this is a bug in asXML(). Note that if I reverse the use
      and host_name strings in the input and in your grammar, I get this XML
      output:

      <Hosts>
      <ITEM>host-01</ITEM>
      <use>generic</use>
      <alias>host alias xyz</alias>
      <ip_address>10. 0.0.1</ip_address>
      </Hosts>

      Fortunately, you have provided a nice short test case, which should
      allow me to track down the problem.

      Thanks,
      -- Paul

        Comment

        • name
          #3
          Re: pyparsing problem

          Paul McGuire <ptmcg@austin.r r.comwrote in news:be7af822-70d7-44fb-96fa-
          78b490192334@r6 6g2000hsg.googl egroups.com:
          >
          Looks like this is a bug in asXML(). Note that if I reverse the use
          and host_name strings in the input and in your grammar, I get this XML
          output:
          >
          <Hosts>
          <ITEM>host-01</ITEM>
          <use>generic</use>
          <alias>host alias xyz</alias>
          <ip_address>10. 0.0.1</ip_address>
          </Hosts>
          >
          Fortunately, you have provided a nice short test case, which should
          allow me to track down the problem.
          >
          Thanks,
          -- Paul
          >
          You are welcome! And I would like to thank you for this outstanding tool!

          Thanks,
          Bernhard

            Comment

            • Paul McGuire
              #4
              Re: pyparsing problem

              On Jul 1, 8:02 am, name <x...@y.zwrot e:
              Hi,
              >
              I try to parse a file with pyparsing and get this output:
              >
                  ['generic', 'host-01', 'host alias xyz', '10.0.0.1']
                  - alias: host alias xyz
                  - host_name: ['host-01']
                  - ip_address: ['10.0.0.1']
                  - use: ['generic']
              >
                  <Hosts>
                    <ITEM>generic </ITEM>
                    <host_name>ho st-01</host_name>
                    <alias>host alias xyz</alias>
                    <ip_address>10. 0.0.1</ip_address>
                  </Hosts>
              >
                  ['generic', 'host-01', 'host alias xyz', '10.0.0.1']
              >
                  finished
              >
              What I don't understand is why I get the line
              >
                  <ITEM>generic </ITEM>
              >
              and not
              >
                  <use>generic</use>
              >
              as there is an associated name in the dump() output.
              >
              Thank you very much in advance for any clue or help you could
              provide.
              >
              The code:
              ---------
              >
              #!/usr/bin/env python
              >
              from pyparsing import *
              >
              sample = """
              define host{
                use                   generic
                host_name             host-01
                alias                 host alias xyz
                address                       10.0.0.1}
              >
              """
              >
              # define tokens
              LBRACE,RBRACE = map(Suppress, '{}')
              ipAddress = Combine(Word(nu ms) + ('.' + Word(nums))*3)
              useTemplate = oneOf('generic user')
              >
              # define grammar
              >
              deviceName = Word(alphanums+ '-')
              hostDef = Literal('define ').suppress() + Literal('host') .suppress()
              useLine = Suppress('use') + useTemplate + Suppress(SkipTo (lineEnd))
              host_nameLine = Suppress('host_ name') + deviceName + Suppress(SkipTo
              (lineEnd))
              aliasLine = Suppress('alias ') + SkipTo(lineEnd)
              aliasLine.setPa rseAction(lambd a x: ' '.join(x[0].split()))
              ip_addressLine = Suppress('addre ss') + ipAddress
              >
              use = useLine.setResu ltsName('use')
              host_name = host_nameLine.s etResultsName(' host_name')
              alias = aliasLine.setRe sultsName('alia s')
              ip_address = ip_addressLine. setResultsName( 'ip_address')
              >
              host_stmt = (use + host_name + alias + ip_address)
              host = hostDef + LBRACE + host_stmt  + RBRACE
              >
              test_file = OneOrMore(host) + stringEnd
              >
              # test
              x = test_file.parse String(sample)
              print x.dump()
              print
              print x.asXML('Hosts' )
              print
              print x.asList()
              print
              >
              print 'finished'
              Try downloading the latest pyparsing.py file from the SourceForge SVN
              repository. This bug should be fixed in the latest version.

              -- Paul

                Comment

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