我正在尝试解析网络设备配置文件，虽然我会浏览整个文件，但我不想包含文件的所有条款，而只想包含其中的一个子集。
所以假设配置文件如下：
bootfile abc.bin
motd "this is a
message for everyone to follow"
.
.
.
group 1
group 2
.
.
.
permit tcp ab.b.c.d b.b.b.y eq 222
permit tcp ab.b.c.d b.b.b.y eq 222
permit tcp ab.b.c.d b.b.b.y eq 222
.
.
.
interface a
description this is interface a
vlan 33
interface b
description craigs list
no shut
vlan 33
no ip address
.
.
.
我只是想捕获接口线（按原样）以及描述和 VLAN 线 - 其他所有内容都将被忽略。界面内的内容将分为 2 个属性：有效和无效
所以语法看起来像这样：
Config[noskipsp]:
interfaces *= !InterfaceDefinition | InterfaceDefinition
;
InterfaceDefinition:
interface = intf
valids *= valid
invalids *= invalid
;
intf: /^interface .*\n/;
cmds: /^ (description|vlan) .*\n/;
invalid: /^(?!(interface|description|vlan) .*\n;
目标是获得一个Python接口数组，其中每个接口都有2个属性：valids和invalids，每个都是数组。有效数组将包含描述或 VLAN 条目，无效数组将包含其他所有内容。
有几个我似乎无法解决的挑战： 1-如何忽略所有其他不是接口定义的内容？ 2- 如何确保所有接口最终都作为一个接口而不是另一个接口的 invalids 属性？
不幸的是 - 解析文本时的语法不会失败，但我对解析器如何遍历文本的理解似乎有问题，因为它在尝试读取通过“interface .*”部分的任何文本时会抱怨。
此外，目前我正在使用仅包含接口定义的文件进行显式测试，但目标是处理完整文件，仅针对接口，因此需要从语法方面丢弃所有其他内容。
更新进度
最初 - 在 Igor 的第一个答案之后，我能够创建一个语法，可以成功地完全解析我拥有的虚拟配置文件，尽管结果不是所需的 - 可能是由于我的无知。根据 Igor 的第二次更新答案，我决定重构原始语法并简化它以尝试匹配我的示例虚拟配置。
我在模型级别的目标是能够拥有一个类似于以下伪结构的对象
class network_config:
def __init__(self):
self.invalid = [] # Entries that do not match the higher level
# hierarchy objects
self.interfaces = [] # Inteface definitions
class Interface:
def __init__(self):
self.name = ""
self.vlans = []
self.description = ""
self.junk = [] # This are all other configurations
# within the interface that are not
# matching neither vlans or description
虚拟配置文件（要解析的数据）如下所示：
junk
irrelevant configuration line
interface GigabitEthernet0/0/0
description 3 and again
nonsense
vlan 33
this and that
vlan 16
interface GigabitEthernet0/0/2
something for the nic
vlan 22
description here and there
! a simple comment
intermiediate
more nonrelated information
interface GigabitEthernet0/0/3
this is junk too
vlan 99
don't forget this
interface GigabitEthernet0/0/1
interface GigabitEthernet0/0/9
nothing of interest
silly stuff
some final data
我创建的新textx语法如下：
Config:
(
invalid*=Junk
| interfaces*=Interface
)*
;
Junk:
/(?s)(?!((interface)|(vlan)|(description)).)[^\n]*\n/ // <- consume that is not a 'vlan', 'description', nor 'interface'
;
Interface:
'interface' name=/[^\n]+\n/
( description+=Description
| vlans*=Vlan
| invalids*=InterfaceJunk
)*
;
Description:
/description[^\n]+\n/
;
Vlan:
/vlan[^\n]+\n/
;
InterfaceJunk:
/(?!((interface)|(vlan)|(description))).[^\n]*\n/ // <- consume everything that is not an interface, vlan, or description
;
令我惊讶的是，当我尝试对抗它时 - 我注意到它正在进入无限循环。我还注意到改变根规则从
Config:
(
invalid*=Junk
| interfaces*=Interface
)*
;
*** PARSING MODEL ***
>> Matching rule Model=Sequence at position 0 => *junk irrel
>> Matching rule Config=ZeroOrMore in Model at position 0 => *junk irrel
>> Matching rule OrderedChoice in Config at position 0 => *junk irrel
>> Matching rule __asgn_zeroormore=ZeroOrMore[invalid] in Config at position 0 => *junk irrel
?? Try match rule Junk=RegExMatch((?s)(?!((interface)|(vlan)|(description)).)[^\n]+\n) in __asgn_zeroormore at position 0 => *junk irrel
++ Match 'junk
' at 0 => '*junk *irrel'
?? Try match rule Junk=RegExMatch((?s)(?!((interface)|(vlan)|(description)).)[^\n]+\n) in __asgn_zeroormore at position 5 => junk *irrelevant
++ Match 'irrelevant configuration line
' at 5 => 'junk *irrelevant configuration line *'
?? Try match rule Junk=RegExMatch((?s)(?!((interface)|(vlan)|(description)).)[^\n]+\n) in __asgn_zeroormore at position 35 => tion line *interface
-- NoMatch at 35
<<+ Matched rule __asgn_zeroormore=ZeroOrMore[invalid] in __asgn_zeroormore at position 35 => tion line *interface
<<+ Matched rule OrderedChoice in Config at position 35 => tion line *interface
>> Matching rule OrderedChoice in Config at position 35 => tion line *interface
>> Matching rule __asgn_zeroormore=ZeroOrMore[invalid] in Config at position 35 => tion line *interface
?? Try match rule Junk=RegExMatch((?s)(?!((interface)|(vlan)|(description)).)[^\n]+\n) in __asgn_zeroormore at position 35 => tion line *interface
-- NoMatch at 35
<<- Not matched rule __asgn_zeroormore=ZeroOrMore[invalid] in __asgn_zeroormore at position 35 => tion line *interface
<<- Not matched rule OrderedChoice in Config at position 35 => tion line *interface
>> Matching rule OrderedChoice in Config at position 35 => tion line *interface
>> Matching rule __asgn_zeroormore=ZeroOrMore[invalid] in Config at position 35 => tion line *interface
?? Try match rule Junk=RegExMatch((?s)(?!((interface)|(vlan)|(description)).)[^\n]+\n) in __asgn_zeroormore at position 35 => tion line *interface
-- NoMatch at 35
<<- Not matched rule __asgn_zeroormore=ZeroOrMore[invalid] in __asgn_zeroormore at position 35 => tion line *interface
到
Config:
(
invalid*=Junk interfaces*=Interface
)*
;
*** PARSING MODEL ***
>> Matching rule Model=Sequence at position 0 => *junk irrel
>> Matching rule Config=ZeroOrMore in Model at position 0 => *junk irrel
>> Matching rule Sequence in Config at position 0 => *junk irrel
>> Matching rule __asgn_zeroormore=ZeroOrMore[invalid] in Config at position 0 => *junk irrel
?? Try match rule Junk=RegExMatch((?s)(?!((interface)|(vlan)|(description)).)[^\n]+\n) in __asgn_zeroormore at position 0 => *junk irrel
++ Match 'junk
' at 0 => '*junk *irrel'
?? Try match rule Junk=RegExMatch((?s)(?!((interface)|(vlan)|(description)).)[^\n]+\n) in __asgn_zeroormore at position 5 => junk *irrelevant
++ Match 'irrelevant configuration line
' at 5 => 'junk *irrelevant configuration line *'
?? Try match rule Junk=RegExMatch((?s)(?!((interface)|(vlan)|(description)).)[^\n]+\n) in __asgn_zeroormore at position 35 => tion line *interface
-- NoMatch at 35
<<+ Matched rule __asgn_zeroormore=ZeroOrMore[invalid] in __asgn_zeroormore at position 35 => tion line *interface
>> Matching rule __asgn_zeroormore=ZeroOrMore[interfaces] in Config at position 35 => tion line *interface
>> Matching rule Interface=Sequence in __asgn_zeroormore at position 35 => tion line *interface
?? Try match rule StrMatch(interface) in Interface at position 35 => tion line *interface
++ Match 'interface' at 35 => 'tion line *interface* '
>> Matching rule __asgn_plain=Sequence[name] in Interface at position 44 => interface* GigabitEt
?? Try match rule RegExMatch([^\n]+\n) in __asgn_plain at position 45 => interface *GigabitEth
++ Match 'GigabitEthernet0/0/0
' at 45 => 'interface *GigabitEthernet0/0/0 *'
<<+ Matched rule __asgn_plain=Sequence[name] in __asgn_plain at position 66 => rnet0/0/0 * descrip
>> Matching rule ZeroOrMore in Interface at position 66 => rnet0/0/0 * descrip
>> Matching rule OrderedChoice in Interface at position 66 => rnet0/0/0 * descrip
>> Matching rule __asgn_oneormore=OneOrMore[description] in Interface at position 66 => rnet0/0/0 * descrip
?? Try match rule Description=RegExMatch(description[^\n]+\n) in __asgn_oneormore at position 69 => t0/0/0 *descriptio
++ Match 'description 3 and again
' at 69 => 't0/0/0 *description 3 and again *'
?? Try match rule Description=RegExMatch(description[^\n]+\n) in __asgn_oneormore at position 96 => again *nonsense
-- NoMatch at 96
给出了 2 个不同的结果，尽管它们都不是我所希望的 - 在第一种格式中，解析器最终会卡住循环，不断寻找无效模式（即；垃圾），而在第二种格式中，解析器将能够通过寻找无效者，并至少找到第一个
interface GigabitEthernet0/0/0我的印象是，执行 ( attr1*=pattern1 | attr2*=pattern2 | attr3*=pattern3) 意味着它会尝试每个模式，但只要pattern1不存在，它似乎就会停留在pattern1上被发现。 （有序选择描述了它） - 我的语法中一定有某些东西导致了这种情况。
然后我继续将语法解析器更新为以下内容 - 这似乎让我更进一步并摆脱了无限循环，但不知何故，在查看调试信息时 - 似乎当它用尽规则内的条件时，它回溯它所在的文本...
Config:
(
(
invalid*=Junk
| interfaces*=Interface
)#
)*
;
Junk:
/(?!((interface)|(vlan)|(description)).)[^\n]*\n/ // <- consume everything till the 'vlan', interface, or description
;
Interface[noskipws]:
'interface'/\s*/ name=/[^\n]+\n/
(
( description+=Description
| vlans*=Vlan
| invalids*=InterfaceJunk
)# // How does this get out from here - how does textx know to get out (if all 3 possibilities are not matched?)
)*
;
Description[noskipws]:
/\s+description[^\n]+\n/
;
Vlan[noskipws]:
/\s+vlan[^\n]+\n/
;
InterfaceJunk[noskipws]:
/(?!((interface)|(\s+vlan)|(\s+description)).)[^\n]*\n/ // <- consume everything till the 'vlan', interface, or description
;
日志现在看起来像：
*** PARSING MODEL ***
>> Matching rule Model=Sequence at position 0 => *junk irrel
>> Matching rule Config=ZeroOrMore in Model at position 0 => *junk irrel
>> Matching rule UnorderedGroup in Config at position 0 => *junk irrel
>> Matching rule __asgn_zeroormore=ZeroOrMore[invalid] in Config at position 0 => *junk irrel
?? Try match rule Junk=RegExMatch((?!((interface)|(vlan)|(description)).)[^\n]*\n) in __asgn_zeroormore at position 0 => *junk irrel
++ Match 'junk
' at 0 => '*junk *irrel'
?? Try match rule Junk=RegExMatch((?!((interface)|(vlan)|(description)).)[^\n]*\n) in __asgn_zeroormore at position 5 => junk *irrelevant
++ Match 'irrelevant configuration line
' at 5 => 'junk *irrelevant configuration line *'
?? Try match rule Junk=RegExMatch((?!((interface)|(vlan)|(description)).)[^\n]*\n) in __asgn_zeroormore at position 35 => tion line *interface
-- NoMatch at 35
<<+ Matched rule __asgn_zeroormore=ZeroOrMore[invalid] in __asgn_zeroormore at position 35 => tion line *interface
>> Matching rule __asgn_zeroormore=ZeroOrMore[interfaces] in Config at position 35 => tion line *interface
>> Matching rule Interface=Sequence in __asgn_zeroormore at position 35 => tion line *interface
?? Try match rule StrMatch(interface) in Interface at position 35 => tion line *interface
++ Match 'interface' at 35 => 'tion line *interface* '
?? Try match rule RegExMatch(\s*) in Interface at position 44 => interface* GigabitEt
++ Match ' ' at 44 => ' interface* *GigabitEt'
>> Matching rule __asgn_plain=Sequence[name] in Interface at position 45 => interface *GigabitEth
?? Try match rule RegExMatch([^\n]+\n) in __asgn_plain at position 45 => interface *GigabitEth
++ Match 'GigabitEthernet0/0/0
' at 45 => 'interface *GigabitEthernet0/0/0 *'
<<+ Matched rule __asgn_plain=Sequence[name] in __asgn_plain at position 66 => rnet0/0/0 * nonsens
>> Matching rule ZeroOrMore in Interface at position 66 => rnet0/0/0 * nonsens
>> Matching rule UnorderedGroup in Interface at position 66 => rnet0/0/0 * nonsens
>> Matching rule __asgn_oneormore=OneOrMore[description] in Interface at position 66 => rnet0/0/0 * nonsens
>> Matching rule Description=Sequence in __asgn_oneormore at position 66 => rnet0/0/0 * nonsens
?? Try match rule RegExMatch(\s+description[^\n]+\n) in Description at position 66 => rnet0/0/0 * nonsens
-- NoMatch at 66
<<- Not matched rule Description=Sequence in Description at position 66 => rnet0/0/0 * nonsens
<<- Not matched rule __asgn_oneormore=OneOrMore[description] in __asgn_oneormore at position 66 => rnet0/0/0 * nonsens
>> Matching rule __asgn_zeroormore=ZeroOrMore[vlans] in Interface at position 66 => rnet0/0/0 * nonsens
>> Matching rule Vlan=Sequence in __asgn_zeroormore at position 66 => rnet0/0/0 * nonsens
?? Try match rule RegExMatch(\s+vlan[^\n]+\n) in Vlan at position 66 => rnet0/0/0 * nonsens
-- NoMatch at 66
<<- Not matched rule Vlan=Sequence in Vlan at position 66 => rnet0/0/0 * nonsens
<<- Not matched rule __asgn_zeroormore=ZeroOrMore[vlans] in __asgn_zeroormore at position 66 => rnet0/0/0 * nonsens
>> Matching rule __asgn_zeroormore=ZeroOrMore[invalids] in Interface at position 66 => rnet0/0/0 * nonsens
>> Matching rule InterfaceJunk=Sequence in __asgn_zeroormore at position 66 => rnet0/0/0 * nonsens
?? Try match rule RegExMatch((?!((interface)|(\s+vlan)|(\s+description)).)[^\n]*\n) in InterfaceJunk at position 66 => rnet0/0/0 * nonsens
++ Match ' nonsense
' at 66 => 'rnet0/0/0 * nonsense *'
<<+ Matched rule InterfaceJunk=Sequence in InterfaceJunk at position 78 => nonsense * vlan 33
>> Matching rule InterfaceJunk=Sequence in __asgn_zeroormore at position 78 => nonsense * vlan 33
?? Try match rule RegExMatch((?!((interface)|(\s+vlan)|(\s+description)).)[^\n]*\n) in InterfaceJunk at position 78 => nonsense * vlan 33
-- NoMatch at 78
<<- Not matched rule InterfaceJunk=Sequence in InterfaceJunk at position 78 => nonsense * vlan 33
<<+ Matched rule __asgn_zeroormore=ZeroOrMore[invalids] in __asgn_zeroormore at position 78 => nonsense * vlan 33
>> Matching rule __asgn_oneormore=OneOrMore[description] in Interface at position 78 => nonsense * vlan 33
>> Matching rule Description=Sequence in __asgn_oneormore at position 78 => nonsense * vlan 33
?? Try match rule RegExMatch(\s+description[^\n]+\n) in Description at position 78 => nonsense * vlan 33
-- NoMatch at 78
<<- Not matched rule Description=Sequence in Description at position 78 => nonsense * vlan 33
<<- Not matched rule __asgn_oneormore=OneOrMore[description] in __asgn_oneormore at position 78 => nonsense * vlan 33
>> Matching rule __asgn_zeroormore=ZeroOrMore[vlans] in Interface at position 78 => nonsense * vlan 33
>> Matching rule Vlan=Sequence in __asgn_zeroormore at position 78 => nonsense * vlan 33
?? Try match rule RegExMatch(\s+vlan[^\n]+\n) in Vlan at position 78 => nonsense * vlan 33
++ Match ' vlan 33
' at 78 => ' nonsense * vlan 33 *'
<<+ Matched rule Vlan=Sequence in Vlan at position 89 => vlan 33 * descrip
>> Matching rule Vlan=Sequence in __asgn_zeroormore at position 89 => vlan 33 * descrip
?? Try match rule RegExMatch(\s+vlan[^\n]+\n) in Vlan at position 89 => vlan 33 * descrip
-- NoMatch at 89
<<- Not matched rule Vlan=Sequence in Vlan at position 89 => vlan 33 * descrip
<<+ Matched rule __asgn_zeroormore=ZeroOrMore[vlans] in __asgn_zeroormore at position 89 => vlan 33 * descrip
>> Matching rule __asgn_oneormore=OneOrMore[description] in Interface at position 89 => vlan 33 * descrip
>> Matching rule Description=Sequence in __asgn_oneormore at position 89 => vlan 33 * descrip
?? Try match rule RegExMatch(\s+description[^\n]+\n) in Description at position 89 => vlan 33 * descrip
++ Match ' description 3 and again
' at 89 => ' vlan 33 * description 3 and again *'
<<+ Matched rule Description=Sequence in Description at position 116 => and again * this an
>> Matching rule Description=Sequence in __asgn_oneormore at position 116 => and again * this an
?? Try match rule RegExMatch(\s+description[^\n]+\n) in Description at position 116 => and again * this an
-- NoMatch at 116
<<- Not matched rule Description=Sequence in Description at position 116 => and again * this an
<<+ Matched rule __asgn_oneormore=OneOrMore[description] in __asgn_oneormore at position 116 => and again * this an
<<+ Matched rule UnorderedGroup in Interface at position 116 => and again * this an
>> Matching rule UnorderedGroup in Interface at position 116 => and again * this an
>> Matching rule __asgn_oneormore=OneOrMore[description] in Interface at position 116 => and again * this an
>> Matching rule Description=Sequence in __asgn_oneormore at position 116 => and again * this an
?? Try match rule RegExMatch(\s+description[^\n]+\n) in Description at position 116 => and again * this an
-- NoMatch at 116
<<- Not matched rule Description=Sequence in Description at position 116 => and again * this an
<<- Not matched rule __asgn_oneormore=OneOrMore[description] in __asgn_oneormore at position 116 => and again * this an
>> Matching rule __asgn_zeroormore=ZeroOrMore[vlans] in Interface at position 116 => and again * this an
>> Matching rule Vlan=Sequence in __asgn_zeroormore at position 116 => and again * this an
?? Try match rule RegExMatch(\s+vlan[^\n]+\n) in Vlan at position 116 => and again * this an
-- NoMatch at 116
<<- Not matched rule Vlan=Sequence in Vlan at position 116 => and again * this an
<<- Not matched rule __asgn_zeroormore=ZeroOrMore[vlans] in __asgn_zeroormore at position 116 => and again * this an
>> Matching rule __asgn_zeroormore=ZeroOrMore[invalids] in Interface at position 116 => and again * this an
>> Matching rule InterfaceJunk=Sequence in __asgn_zeroormore at position 116 => and again * this an
?? Try match rule RegExMatch((?!((interface)|(\s+vlan)|(\s+description)).)[^\n]*\n) in InterfaceJunk at position 116 => and again * this an
++ Match ' this and that
' at 116 => 'and again * this and that *'
<<+ Matched rule InterfaceJunk=Sequence in InterfaceJunk at position 133 => and that * vlan 16
>> Matching rule InterfaceJunk=Sequence in __asgn_zeroormore at position 133 => and that * vlan 16
?? Try match rule RegExMatch((?!((interface)|(\s+vlan)|(\s+description)).)[^\n]*\n) in InterfaceJunk at position 133 => and that * vlan 16
-- NoMatch at 133
<<- Not matched rule InterfaceJunk=Sequence in InterfaceJunk at position 133 => and that * vlan 16
<<+ Matched rule __asgn_zeroormore=ZeroOrMore[invalids] in __asgn_zeroormore at position 133 => and that * vlan 16
>> Matching rule __asgn_oneormore=OneOrMore[description] in Interface at position 133 => and that * vlan 16
>> Matching rule Description=Sequence in __asgn_oneormore at position 133 => and that * vlan 16
?? Try match rule RegExMatch(\s+description[^\n]+\n) in Description at position 133 => and that * vlan 16
-- NoMatch at 133
<<- Not matched rule Description=Sequence in Description at position 133 => and that * vlan 16
<<- Not matched rule __asgn_oneormore=OneOrMore[description] in __asgn_oneormore at position 133 => and that * vlan 16
>> Matching rule __asgn_zeroormore=ZeroOrMore[vlans] in Interface at position 133 => and that * vlan 16
>> Matching rule Vlan=Sequence in __asgn_zeroormore at position 133 => and that * vlan 16
?? Try match rule RegExMatch(\s+vlan[^\n]+\n) in Vlan at position 133 => and that * vlan 16
++ Match ' vlan 16
' at 133 => ' and that * vlan 16 *'
<<+ Matched rule Vlan=Sequence in Vlan at position 144 => vlan 16 *interface
>> Matching rule Vlan=Sequence in __asgn_zeroormore at position 144 => vlan 16 *interface
?? Try match rule RegExMatch(\s+vlan[^\n]+\n) in Vlan at position 144 => vlan 16 *interface
-- NoMatch at 144
<<- Not matched rule Vlan=Sequence in Vlan at position 144 => vlan 16 *interface
<<+ Matched rule __asgn_zeroormore=ZeroOrMore[vlans] in __asgn_zeroormore at position 144 => vlan 16 *interface
>> Matching rule __asgn_oneormore=OneOrMore[description] in Interface at position 144 => vlan 16 *interface
>> Matching rule Description=Sequence in __asgn_oneormore at position 144 => vlan 16 *interface
?? Try match rule RegExMatch(\s+description[^\n]+\n) in Description at position 144 => vlan 16 *interface
-- NoMatch at 144
<<- Not matched rule Description=Sequence in Description at position 144 => vlan 16 *interface
<<- Not matched rule __asgn_oneormore=OneOrMore[description] in __asgn_oneormore at position 144 => vlan 16 *interface
<<- Not matched rule UnorderedGroup in Interface at position 116 => and again * this an
<<+ Matched rule ZeroOrMore in Interface at position 116 => and again * this an
<<+ Matched rule Interface=Sequence in Interface at position 116 => and again * this an
>> Matching rule Interface=Sequence in __asgn_zeroormore at position 116 => and again * this an
?? Try match rule StrMatch(interface) in Interface at position 116 => and again * this an
-- No match 'interface' at 116 => 'and again * this a*n'
<<- Not matched rule Interface=Sequence in Interface at position 116 => and again * this an
<<+ Matched rule __asgn_zeroormore=ZeroOrMore[interfaces] in __asgn_zeroormore at position 116 => and again * this an
<<+ Matched rule UnorderedGroup in Config at position 116 => and again * this an
>> Matching rule UnorderedGroup in Config at position 116 => and again * this an
>> Matching rule __asgn_zeroormore=ZeroOrMore[invalid] in Config at position 116 => and again * this an
?? Try match rule Junk=RegExMatch((?!((interface)|(vlan)|(description)).)[^\n]*\n) in __asgn_zeroormore at position 119 => again *this and t
++ Match 'this and that
' at 119 => ' again *this and that *'
?? Try match rule Junk=RegExMatch((?!((interface)|(vlan)|(description)).)[^\n]*\n) in __asgn_zeroormore at position 136 => d that *vlan 16 in
-- NoMatch at 136
<<+ Matched rule __asgn_zeroormore=ZeroOrMore[invalid] in __asgn_zeroormore at position 133 => and that * vlan 16
>> Matching rule __asgn_zeroormore=ZeroOrMore[interfaces] in Config at position 133 => and that * vlan 16
>> Matching rule Interface=Sequence in __asgn_zeroormore at position 133 => and that * vlan 16
?? Try match rule StrMatch(interface) in Interface at position 133 => and that * vlan 16
-- No match 'interface' at 133 => ' and that * vlan 1*6'
<<- Not matched rule Interface=Sequence in Interface at position 133 => and that * vlan 16
<<- Not matched rule __asgn_zeroormore=ZeroOrMore[interfaces] in __asgn_zeroormore at position 133 => and that * vlan 16
<<+ Matched rule UnorderedGroup in Config at position 133 => and that * vlan 16
>> Matching rule UnorderedGroup in Config at position 133 => and that * vlan 16
>> Matching rule __asgn_zeroormore=ZeroOrMore[invalid] in Config at position 133 => and that * vlan 16
?? Try match rule Junk=RegExMatch((?!((interface)|(vlan)|(description)).)[^\n]*\n) in __asgn_zeroormore at position 136 => d that *vlan 16 in
-- NoMatch at 136
<<- Not matched rule __asgn_zeroormore=ZeroOrMore[invalid] in __asgn_zeroormore at position 133 => and that * vlan 16
>> Matching rule __asgn_zeroormore=ZeroOrMore[interfaces] in Config at position 133 => and that * vlan 16
>> Matching rule Interface=Sequence in __asgn_zeroormore at position 133 => and that * vlan 16
?? Try match rule StrMatch(interface) in Interface at position 133 => and that * vlan 16
-- No match 'interface' at 133 => ' and that * vlan 1*6'
<<- Not matched rule Interface=Sequence in Interface at position 133 => and that * vlan 16
<<- Not matched rule __asgn_zeroormore=ZeroOrMore[interfaces] in __asgn_zeroormore at position 133 => and that * vlan 16
<<- Not matched rule UnorderedGroup in Config at position 133 => and that * vlan 16
<<+ Matched rule Config=ZeroOrMore in Config at position 133 => and that * vlan 16
?? Try match rule EOF in Model at position 136 => d that *vlan 16 in
!! EOF not matched.
<<- Not matched rule Model=Sequence in Model at position 0 => *junk irrel
Traceback (most recent call last):
...
关于我的误解在哪里有什么提示吗？
修订后的工作语法
经过 Igor 的提示（谢谢），我已经能够制作最终的 Grammar.tx，它成功解析并在 textx 生成的模型中产生所需的对象结果（参见最终答案）
你所做的通常被称为Island Grammars。您可以在 textX 中轻松做到这一点，并且可以轻松提取界面的实际结构。这是一种可能的解决方案：
from textx import metamodel_from_str
mmstr = r'''
Config:
(
/(?s)((?!interface).)*/ // <- consume everything till the keyword 'interface'
interfaces=Interface
)*
/(?s).*/ // <- consume all content after the last interface
;
Interface:
'interface' name=ID
'description' description=/[^\n]*/
/((?!vlan).)*/ // <- consume everything till the 'vlan'
'vlan' vlan=INT;
'''
model_str = r'''
bootfile abc.bin
motd "this is a
message for everyone to follow"
.
.
.
group 1
group 2
.
.
.
permit tcp ab.b.c.d b.b.b.y eq 222
permit tcp ab.b.c.d b.b.b.y eq 222
permit tcp ab.b.c.d b.b.b.y eq 222
.
.
.
interface a
description this is interface a
vlan 33
interface b
description craigs list
no shut
vlan 33
no ip address
'''
mm = metamodel_from_str(mmstr)
model = mm.model_from_str(model_str)
for i in model.interfaces:
print(i.name, i.description, i.vlan)
您始终可以将 textX 置于调试模式（通过传递
debug=True添加 - 任意顺序的界面元素
Interface:
'interface' name=ID
('description' description=/[^\n]*/
| 'vlan' vlan=INT
| /(?s)(?!interface)./ // <- Consume a single char if not description or vlan or interface
)* // <- and then repeat
这适用于任何位置的
descriptionvlanvlandescriptionInterfacedef interface_processor(obj):
if obj.description:
obj.description = obj.description[0]
if obj.vlan:
obj.vlan = obj.vlan[0]
不要忘记注册这个对象处理器。有关详细信息，请参阅 textX 文档。
Config:
(
Junk
| interfaces=Interface
)*
;
Junk:
/(?!((interface)|(vlan)|(description)).)[^\n]*\n/
;
Interface[noskipws]:
'interface'/\s*/ name=/[^\n]+\n/
(
description+=Description
| vlans=Vlan
| invalids=InterfaceJunk
)*
;
Description[noskipws]:
/\s+description[^\n]+\n/
;
Vlan[noskipws]:
/\s+vlan[^\n]+\n/
;
InterfaceJunk[noskipws]:
/(?!((interface)|(\s+vlan)|(\s+description)).)[^\n]*\n/
;
有以下更改：