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# vim: fileencoding=utf-8
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#
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# ToDo: написать счетчик скобок для финальной оценки корректности
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# документа.
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#
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from .base_format import BaseFormat
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from collections import OrderedDict
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from pyparsing import originalTextFor, Literal, ZeroOrMore, Word, printables,\
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OneOrMore, alphanums, ParseException, pyparsing_unicode,\
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Group, Optional, alphas, lineEnd, lineStart, Keyword
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class DovecotFormat(BaseFormat):
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def __init__(self, document_text: str, ignore_comments=False):
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processing_methods = [self._parse_comment_line,
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self._parse_section_start_line,
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self._parse_include_line,
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self._parse_section_end_line,
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self._parse_parameter_line,
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self._parse_parameter_to_delete_line]
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super().__init__(processing_methods)
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self._ignore_comments = ignore_comments
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self._need_finish = True
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self._comments_processing = True
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self._format = 'dovecot'
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self._section_stack = OrderedDict()
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self._current_section_name = ''
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self._last_comments_list = []
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self._initialize_parser()
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if document_text == '':
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self._document_dictionary = OrderedDict()
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else:
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document_lines = self._get_list_of_logic_lines(document_text)
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self._lines_to_dictionary(document_lines)
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def _initialize_parser(self):
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# Знаки пунктуации и действий.
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left_brace = Literal('{')
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right_brace = Literal('}')
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action_symbols = (Literal('!') | Literal('-'))
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self._comment_line_parser = originalTextFor(
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Literal('#')
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+ ZeroOrMore(Word(
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printables
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+ pyparsing_unicode.alphanums)
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)
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)('comment')
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# Для парсинга строк с началом секций.
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section = Word(alphas, alphanums+'-_', excludeChars='{}')
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section_name = Word(printables, excludeChars='{}')
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self._section_start_parser = Group(Optional(action_symbols,
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default='')('action')
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+ section
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+ Optional(section_name)
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+ left_brace.suppress())('name')
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# Для парсинга строк, указывающих конец секций.
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self._section_end_parser = lineStart() + right_brace + lineEnd()
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# Для парсинга строк, содержащих параметры.
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parameter_name = Word(alphas, alphanums+'_-', excludeChars='{}=')
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parameter_value = OneOrMore(Word(printables))
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self._parameter_line_parser = (Group(Optional(action_symbols,
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default='')('action')
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+ parameter_name)('name')
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+ Literal('=').suppress()
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+ originalTextFor(
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parameter_value
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)('value'))
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# Для парсинга строк с параметрами, подлежащими удалению.
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self._parameter_to_delete_parser = (action_symbols('action')
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+ parameter_name
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+ Optional(Literal('=')).suppress()
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)
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# Для парсинга строк, содержащих директиву !include.
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include = Keyword('!include') | Keyword('!include_try')
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include_line_plain = (Optional(~action_symbols, default='')('action')
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+ include('keyword') + Word(printables)('value'))
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include_line_to_delete = (action_symbols('action') + include('keyword')
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+ Word(printables)('value'))
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self._include_line_parser = (include_line_plain |
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include_line_to_delete)
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def _parse_section_start_line(self, line):
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try:
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parsing_result = self._section_start_parser.parseString(line)
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self._match = True
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section_name = tuple(parsing_result.name.asList())
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if not self._last_comments_list == []:
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section_content = OrderedDict({'#': self._last_comments_list})
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self._last_comments_list = []
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else:
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section_content = OrderedDict()
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new_section = OrderedDict({section_name: section_content})
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if self._section_stack == OrderedDict():
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if section_name in self._document_dictionary:
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new_section = OrderedDict(
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{section_name:
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self._document_dictionary[section_name]}
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)
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else:
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if section_name in \
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self._section_stack[self._current_section_name]:
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new_section = OrderedDict({
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section_name:
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self._section_stack[self._current_section_name]
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[section_name]
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})
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else:
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self._section_stack[self._current_section_name].update(
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new_section
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)
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self._section_stack.update(new_section)
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self._current_section_name = section_name
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except ParseException:
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return
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def _parse_section_end_line(self, line):
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try:
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self._section_end_parser.parseString(line)
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self._match = True
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last_section_name, last_section = self._section_stack.popitem()
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if self._section_stack == OrderedDict():
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self._item_to_add = OrderedDict({last_section_name:
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last_section})
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self._ready_to_update = True
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self._current_section_name = ''
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else:
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self._current_section_name = next(reversed(
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self._section_stack
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))
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except ParseException:
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return
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def _parse_parameter_line(self, line):
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try:
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parsing_result = self._parameter_line_parser.parseString(line)
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self._match = True
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parameter_name = tuple(parsing_result.name.asList())
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parameter_value = (self._last_comments_list
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+ [parsing_result.value.strip()])
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self._last_comments_list = []
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parameter = OrderedDict({parameter_name: parameter_value})
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if self._section_stack == OrderedDict():
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self._item_to_add = parameter
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self._ready_to_update = True
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else:
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self._section_stack[self._current_section_name].update(
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parameter
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)
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except ParseException:
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return
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def _parse_parameter_to_delete_line(self, line):
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try:
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parsing_result = self._parameter_to_delete_parser.parseString(line)
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self._match = True
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parameter_name = tuple(parsing_result.asList())
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parameter_value = self._last_comments_list + ['']
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self._last_comments_list = []
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parameter = OrderedDict({parameter_name: parameter_value})
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if self._section_stack == OrderedDict():
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self._item_to_add = parameter
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self._ready_to_update = True
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else:
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self._section_stack[self._current_section_name].update(
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parameter
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)
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except ParseException:
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return
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def _parse_include_line(self, line):
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try:
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parsing_result = self._include_line_parser.parseString(line)
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self._match = True
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parameter_name = tuple(parsing_result.asList())
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if parsing_result.action == '-':
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return
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parameter_value = self._last_comments_list + ['']
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self._last_comments_list = []
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include_item = OrderedDict({parameter_name: parameter_value})
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if self._section_stack == OrderedDict():
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self._item_to_add = include_item
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self._ready_to_update = True
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else:
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self._section_stack[self._current_section_name].update(
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include_item
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)
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except ParseException:
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return
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def _parse_comment_line(self, line):
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try:
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parsing_result = self._comment_line_parser.parseString(line)
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self._match = True
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if not self._ignore_comments:
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self._last_comments_list.append(parsing_result.comment)
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except ParseException:
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return
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