prompt: We are currently solving the following issue within our repository. Here is the issue text:
  --- BEGIN ISSUE ---
  nginx plugin destroys config
  I have a config file called webp.conf in /etc/nginx/conf.d/ which works great.
  After running letsencrypt -d example.org run the webp.conf is broken because it's missing a closing }
  https://pastebin.mozilla.org/8837365
  Line 18 gets removed.
  
  
  --- END ISSUE ---
  
  Below are some code segments, each from a relevant file. One or more of these files may contain bugs.
  --- BEGIN FILES ---
  Path: `letsencrypt-nginx/letsencrypt_nginx/nginxparser.py`
  Content:
  ```
  1 """Very low-level nginx config parser based on pyparsing."""
  2 import string
  3 
  4 from pyparsing import (
  5     Literal, White, Word, alphanums, CharsNotIn, Forward, Group,
  6     Optional, OneOrMore, Regex, ZeroOrMore)
  7 from pyparsing import stringEnd
  8 from pyparsing import restOfLine
  9 
  10 class RawNginxParser(object):
  11     # pylint: disable=expression-not-assigned
  12     """A class that parses nginx configuration with pyparsing."""
  13 
  14     # constants
  15     left_bracket = Literal("{").suppress()
  16     right_bracket = Literal("}").suppress()
  17     semicolon = Literal(";").suppress()
  18     space = White().suppress()
  19     key = Word(alphanums + "_/")
  20     # Matches anything that is not a special character AND any chars in single
  21     # or double quotes
  22     value = Regex(r"((\".*\")?(\'.*\')?[^\{\};,]?)+")
  23     location = CharsNotIn("{};," + string.whitespace)
  24     # modifier for location uri [ = | ~ | ~* | ^~ ]
  25     modifier = Literal("=") | Literal("~*") | Literal("~") | Literal("^~")
  26 
  27     # rules
  28     comment = Literal('#') + restOfLine()
  29     assignment = (key + Optional(space + value, default=None) + semicolon)
  30     location_statement = Optional(space + modifier) + Optional(space + location)
  31     if_statement = Literal("if") + space + Regex(r"\(.+\)") + space
  32     block = Forward()
  33 
  34     block << Group(
  35         (Group(key + location_statement) ^ Group(if_statement))
  36         + left_bracket
  37         + Group(ZeroOrMore(Group(comment | assignment) | block))
  38         + right_bracket)
  39 
  40     script = OneOrMore(Group(comment | assignment) | block) + stringEnd
  41 
  42     def __init__(self, source):
  43         self.source = source
  44 
  45     def parse(self):
  46         """Returns the parsed tree."""
  47         return self.script.parseString(self.source)
  48 
  49     def as_list(self):
  50         """Returns the parsed tree as a list."""
  51         return self.parse().asList()
  52 
  53 
  54 class RawNginxDumper(object):
  55     # pylint: disable=too-few-public-methods
  56     """A class that dumps nginx configuration from the provided tree."""
  57     def __init__(self, blocks, indentation=4):
  58         self.blocks = blocks
  59         self.indentation = indentation
  60 
  61     def __iter__(self, blocks=None, current_indent=0, spacer=' '):
  62         """Iterates the dumped nginx content."""
  63         blocks = blocks or self.blocks
  64         for key, values in blocks:
  65             indentation = spacer * current_indent
  66             if isinstance(key, list):
  67                 if current_indent:
  68                     yield ''
  69                 yield indentation + spacer.join(key) + ' {'
  70 
  71                 for parameter in values:
  72                     dumped = self.__iter__([parameter], current_indent + self.indentation)
  73                     for line in dumped:
  74                         yield line
  75 
  76                 yield indentation + '}'
  77             else:
  78                 if key == '#':
  79                     yield spacer * current_indent + key + values
  80                 else:
  81                     if values is None:
  82                         yield spacer * current_indent + key + ';'
  83                     else:
  84                         yield spacer * current_indent + key + spacer + values + ';'
  85 
  86     def as_string(self):
  87         """Return the parsed block as a string."""
  88         return '\n'.join(self) + '\n'
  89 
  90 
  91 # Shortcut functions to respect Python's serialization interface
  92 # (like pyyaml, picker or json)
  93 
  94 def loads(source):
  95     """Parses from a string.
  96 
  97     :param str souce: The string to parse
  98     :returns: The parsed tree
  99     :rtype: list
  100 
  101     """
  102     return RawNginxParser(source).as_list()
  103 
  104 
  105 def load(_file):
  106     """Parses from a file.
  107 
  108     :param file _file: The file to parse
  109     :returns: The parsed tree
  110     :rtype: list
  111 
  112     """
  113     return loads(_file.read())
  114 
  115 
  116 def dumps(blocks, indentation=4):
  117     """Dump to a string.
  118 
  119     :param list block: The parsed tree
  120     :param int indentation: The number of spaces to indent
  121     :rtype: str
  122 
  123     """
  124     return RawNginxDumper(blocks, indentation).as_string()
  125 
  126 
  127 def dump(blocks, _file, indentation=4):
  128     """Dump to a file.
  129 
  130     :param list block: The parsed tree
  131     :param file _file: The file to dump to
  132     :param int indentation: The number of spaces to indent
  133     :rtype: NoneType
  134 
  135     """
  136     return _file.write(dumps(blocks, indentation))
  137
  ```
  --- END FILES ---
  
  Please first localize the bug based on the issue statement, and then generate a patch according to the `git diff` format fenced by three backticks.
  
  Here is an example:
  
  ```diff
  diff --git a/examples/server_async.py b/examples/server_async.py
  --- a/examples/server_async.py
  +++ b/examples/server_async.py
  @@ -313,4 +313,4 @@
   
   
   if __name__ == "__main__":
  -    asyncio.run(run_async_server("."), debug=True)
  +    asyncio.run(run_async_server(), debug=True)
  diff --git a/examples/server_sync.py b/examples/server_sync.py
  --- a/examples/server_sync.py
  +++ b/examples/server_sync.py
  @@ -313,5 +313,5 @@
   
   
   if __name__ == "__main__":
  -    server = run_sync_server(".")
  +    server = run_sync_server()
       server.shutdown()
  
  ```
  
golden_diff: diff --git a/letsencrypt-nginx/letsencrypt_nginx/nginxparser.py b/letsencrypt-nginx/letsencrypt_nginx/nginxparser.py
  --- a/letsencrypt-nginx/letsencrypt_nginx/nginxparser.py
  +++ b/letsencrypt-nginx/letsencrypt_nginx/nginxparser.py
  @@ -37,7 +37,7 @@
           + Group(ZeroOrMore(Group(comment | assignment) | block))
           + right_bracket)
   
  -    script = OneOrMore(Group(comment | assignment) | block) + stringEnd
  +    script = OneOrMore(Group(comment | assignment) ^ block) + stringEnd
   
       def __init__(self, source):
           self.source = source
  
verification_info: {"golden_diff": "diff --git a/letsencrypt-nginx/letsencrypt_nginx/nginxparser.py b/letsencrypt-nginx/letsencrypt_nginx/nginxparser.py\n--- a/letsencrypt-nginx/letsencrypt_nginx/nginxparser.py\n+++ b/letsencrypt-nginx/letsencrypt_nginx/nginxparser.py\n@@ -37,7 +37,7 @@\n         + Group(ZeroOrMore(Group(comment | assignment) | block))\n         + right_bracket)\n \n-    script = OneOrMore(Group(comment | assignment) | block) + stringEnd\n+    script = OneOrMore(Group(comment | assignment) ^ block) + stringEnd\n \n     def __init__(self, source):\n         self.source = source\n", "issue": "nginx plugin destroys config\nI have a config file called webp.conf in /etc/nginx/conf.d/ which works great.\nAfter running letsencrypt -d example.org run the webp.conf is broken because it's missing a closing }\nhttps://pastebin.mozilla.org/8837365\nLine 18 gets removed.\n\n", "before_files": [{"content": "\"\"\"Very low-level nginx config parser based on pyparsing.\"\"\"\nimport string\n\nfrom pyparsing import (\n    Literal, White, Word, alphanums, CharsNotIn, Forward, Group,\n    Optional, OneOrMore, Regex, ZeroOrMore)\nfrom pyparsing import stringEnd\nfrom pyparsing import restOfLine\n\nclass RawNginxParser(object):\n    # pylint: disable=expression-not-assigned\n    \"\"\"A class that parses nginx configuration with pyparsing.\"\"\"\n\n    # constants\n    left_bracket = Literal(\"{\").suppress()\n    right_bracket = Literal(\"}\").suppress()\n    semicolon = Literal(\";\").suppress()\n    space = White().suppress()\n    key = Word(alphanums + \"_/\")\n    # Matches anything that is not a special character AND any chars in single\n    # or double quotes\n    value = Regex(r\"((\\\".*\\\")?(\\'.*\\')?[^\\{\\};,]?)+\")\n    location = CharsNotIn(\"{};,\" + string.whitespace)\n    # modifier for location uri [ = | ~ | ~* | ^~ ]\n    modifier = Literal(\"=\") | Literal(\"~*\") | Literal(\"~\") | Literal(\"^~\")\n\n    # rules\n    comment = Literal('#') + restOfLine()\n    assignment = (key + Optional(space + value, default=None) + semicolon)\n    location_statement = Optional(space + modifier) + Optional(space + location)\n    if_statement = Literal(\"if\") + space + Regex(r\"\\(.+\\)\") + space\n    block = Forward()\n\n    block << Group(\n        (Group(key + location_statement) ^ Group(if_statement))\n        + left_bracket\n        + Group(ZeroOrMore(Group(comment | assignment) | block))\n        + right_bracket)\n\n    script = OneOrMore(Group(comment | assignment) | block) + stringEnd\n\n    def __init__(self, source):\n        self.source = source\n\n    def parse(self):\n        \"\"\"Returns the parsed tree.\"\"\"\n        return self.script.parseString(self.source)\n\n    def as_list(self):\n        \"\"\"Returns the parsed tree as a list.\"\"\"\n        return self.parse().asList()\n\n\nclass RawNginxDumper(object):\n    # pylint: disable=too-few-public-methods\n    \"\"\"A class that dumps nginx configuration from the provided tree.\"\"\"\n    def __init__(self, blocks, indentation=4):\n        self.blocks = blocks\n        self.indentation = indentation\n\n    def __iter__(self, blocks=None, current_indent=0, spacer=' '):\n        \"\"\"Iterates the dumped nginx content.\"\"\"\n        blocks = blocks or self.blocks\n        for key, values in blocks:\n            indentation = spacer * current_indent\n            if isinstance(key, list):\n                if current_indent:\n                    yield ''\n                yield indentation + spacer.join(key) + ' {'\n\n                for parameter in values:\n                    dumped = self.__iter__([parameter], current_indent + self.indentation)\n                    for line in dumped:\n                        yield line\n\n                yield indentation + '}'\n            else:\n                if key == '#':\n                    yield spacer * current_indent + key + values\n                else:\n                    if values is None:\n                        yield spacer * current_indent + key + ';'\n                    else:\n                        yield spacer * current_indent + key + spacer + values + ';'\n\n    def as_string(self):\n        \"\"\"Return the parsed block as a string.\"\"\"\n        return '\\n'.join(self) + '\\n'\n\n\n# Shortcut functions to respect Python's serialization interface\n# (like pyyaml, picker or json)\n\ndef loads(source):\n    \"\"\"Parses from a string.\n\n    :param str souce: The string to parse\n    :returns: The parsed tree\n    :rtype: list\n\n    \"\"\"\n    return RawNginxParser(source).as_list()\n\n\ndef load(_file):\n    \"\"\"Parses from a file.\n\n    :param file _file: The file to parse\n    :returns: The parsed tree\n    :rtype: list\n\n    \"\"\"\n    return loads(_file.read())\n\n\ndef dumps(blocks, indentation=4):\n    \"\"\"Dump to a string.\n\n    :param list block: The parsed tree\n    :param int indentation: The number of spaces to indent\n    :rtype: str\n\n    \"\"\"\n    return RawNginxDumper(blocks, indentation).as_string()\n\n\ndef dump(blocks, _file, indentation=4):\n    \"\"\"Dump to a file.\n\n    :param list block: The parsed tree\n    :param file _file: The file to dump to\n    :param int indentation: The number of spaces to indent\n    :rtype: NoneType\n\n    \"\"\"\n    return _file.write(dumps(blocks, indentation))\n", "path": "letsencrypt-nginx/letsencrypt_nginx/nginxparser.py"}], "after_files": [{"content": "\"\"\"Very low-level nginx config parser based on pyparsing.\"\"\"\nimport string\n\nfrom pyparsing import (\n    Literal, White, Word, alphanums, CharsNotIn, Forward, Group,\n    Optional, OneOrMore, Regex, ZeroOrMore)\nfrom pyparsing import stringEnd\nfrom pyparsing import restOfLine\n\nclass RawNginxParser(object):\n    # pylint: disable=expression-not-assigned\n    \"\"\"A class that parses nginx configuration with pyparsing.\"\"\"\n\n    # constants\n    left_bracket = Literal(\"{\").suppress()\n    right_bracket = Literal(\"}\").suppress()\n    semicolon = Literal(\";\").suppress()\n    space = White().suppress()\n    key = Word(alphanums + \"_/\")\n    # Matches anything that is not a special character AND any chars in single\n    # or double quotes\n    value = Regex(r\"((\\\".*\\\")?(\\'.*\\')?[^\\{\\};,]?)+\")\n    location = CharsNotIn(\"{};,\" + string.whitespace)\n    # modifier for location uri [ = | ~ | ~* | ^~ ]\n    modifier = Literal(\"=\") | Literal(\"~*\") | Literal(\"~\") | Literal(\"^~\")\n\n    # rules\n    comment = Literal('#') + restOfLine()\n    assignment = (key + Optional(space + value, default=None) + semicolon)\n    location_statement = Optional(space + modifier) + Optional(space + location)\n    if_statement = Literal(\"if\") + space + Regex(r\"\\(.+\\)\") + space\n    block = Forward()\n\n    block << Group(\n        (Group(key + location_statement) ^ Group(if_statement))\n        + left_bracket\n        + Group(ZeroOrMore(Group(comment | assignment) | block))\n        + right_bracket)\n\n    script = OneOrMore(Group(comment | assignment) ^ block) + stringEnd\n\n    def __init__(self, source):\n        self.source = source\n\n    def parse(self):\n        \"\"\"Returns the parsed tree.\"\"\"\n        return self.script.parseString(self.source)\n\n    def as_list(self):\n        \"\"\"Returns the parsed tree as a list.\"\"\"\n        return self.parse().asList()\n\n\nclass RawNginxDumper(object):\n    # pylint: disable=too-few-public-methods\n    \"\"\"A class that dumps nginx configuration from the provided tree.\"\"\"\n    def __init__(self, blocks, indentation=4):\n        self.blocks = blocks\n        self.indentation = indentation\n\n    def __iter__(self, blocks=None, current_indent=0, spacer=' '):\n        \"\"\"Iterates the dumped nginx content.\"\"\"\n        blocks = blocks or self.blocks\n        for key, values in blocks:\n            indentation = spacer * current_indent\n            if isinstance(key, list):\n                if current_indent:\n                    yield ''\n                yield indentation + spacer.join(key) + ' {'\n\n                for parameter in values:\n                    dumped = self.__iter__([parameter], current_indent + self.indentation)\n                    for line in dumped:\n                        yield line\n\n                yield indentation + '}'\n            else:\n                if key == '#':\n                    yield spacer * current_indent + key + values\n                else:\n                    if values is None:\n                        yield spacer * current_indent + key + ';'\n                    else:\n                        yield spacer * current_indent + key + spacer + values + ';'\n\n    def as_string(self):\n        \"\"\"Return the parsed block as a string.\"\"\"\n        return '\\n'.join(self) + '\\n'\n\n\n# Shortcut functions to respect Python's serialization interface\n# (like pyyaml, picker or json)\n\ndef loads(source):\n    \"\"\"Parses from a string.\n\n    :param str souce: The string to parse\n    :returns: The parsed tree\n    :rtype: list\n\n    \"\"\"\n    return RawNginxParser(source).as_list()\n\n\ndef load(_file):\n    \"\"\"Parses from a file.\n\n    :param file _file: The file to parse\n    :returns: The parsed tree\n    :rtype: list\n\n    \"\"\"\n    return loads(_file.read())\n\n\ndef dumps(blocks, indentation=4):\n    \"\"\"Dump to a string.\n\n    :param list block: The parsed tree\n    :param int indentation: The number of spaces to indent\n    :rtype: str\n\n    \"\"\"\n    return RawNginxDumper(blocks, indentation).as_string()\n\n\ndef dump(blocks, _file, indentation=4):\n    \"\"\"Dump to a file.\n\n    :param list block: The parsed tree\n    :param file _file: The file to dump to\n    :param int indentation: The number of spaces to indent\n    :rtype: NoneType\n\n    \"\"\"\n    return _file.write(dumps(blocks, indentation))\n", "path": "letsencrypt-nginx/letsencrypt_nginx/nginxparser.py"}]}