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from pyparsing import Literal, Word, ZeroOrMore, Group, Dict, Optional,\
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restOfLine, empty, printables, OneOrMore, oneOf, nums,\
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lineno, line, col, Keyword, SkipTo, LineEnd, Combine
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from enum import Enum
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class CalculateIniParser:
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'''Класс парсера calculate.ini файлов.'''
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class Define(Enum):
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assign = 0
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append = 1
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remove = 2
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def __init__(self):
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lbrack = Literal("[")
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rbrack = Literal("]")
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# comma = Literal(",").suppress()
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comment_symbol = Literal(';') | Literal('#')
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# Define = self.Define
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value_operation = (Literal("=") | Combine(Literal("+") + Literal("="))
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| Combine(Literal("-") + Literal("=")))
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comment = comment_symbol + Optional(restOfLine)
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section_name = Word(printables+'\t', excludeChars='[]')
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value_name = Word(printables+'\t', excludeChars='=-+')
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# non_comma = Word(printables+'\t', excludeChars=',')
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clear_section = lbrack.suppress() + Group(empty) + rbrack.suppress()
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section_start = Group(OneOrMore(lbrack.suppress() + section_name
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+ rbrack.suppress())
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+ (clear_section | ~lbrack())
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+ LineEnd().suppress())
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# Если содержимое ini-файла не предваряется заголовком секции,
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# значит эта строка ошибочна.
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unexpected = Group(~section_start + SkipTo(LineEnd(),
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include=True))("error")
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unexpected.setParseAction(self._unexpected_token)
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key_value = (~lbrack + value_name
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+ value_operation + empty
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+ restOfLine + LineEnd().suppress())
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def strip_key_value(tokens):
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tokens[0] = tokens[0].strip()
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tokens[1] = tokens[1].strip()
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key_value.setParseAction(strip_key_value)
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self.ini_section_parser = (section_start
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+ Group(ZeroOrMore(
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Group(key_value | unexpected)))
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| unexpected)
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self.ini_section_parser.ignore(comment)
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def _unexpected_token(self, string, location, tokens):
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'''Метод вызываемый парсером, если обнаружена некорректная строка,
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предназначен для получения некорректной строки и ее дальнейшего
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разбора.'''
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error_line = line(location, string).strip()
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if error_line:
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self.parse_error(error_line, lineno(location, string),
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col(location, string))
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def parse(self, data):
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for tokens, start, end in self.ini_section_parser.scanString(data):
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if tokens.getName() == "error":
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continue
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section, defkeys = tokens
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section_list = section.asList()
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if section_list[-1] == []:
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self.clear_section(section_list[:-1])
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continue
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self.start_section(section.asList())
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for defkey in defkeys:
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if defkey.getName() == "error":
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continue
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mapOp = {"=": self.Define.assign,
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"+=": self.Define.append,
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"-=": self.Define.remove}
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self.define_key(section.asList(),
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defkey[0], defkey[2],
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mapOp[defkey[1]])
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def start_section(self, section):
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"""Начало секции"""
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pass
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def clear_section(self, section):
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'''Метод для очистки секций.'''
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pass
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def define_key(self, section, defkey, defval, deftype):
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'''Метод для определения ключа.
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['section','block'], 'varname', 'varval', Define.assign'''
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pass
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def parse_error(self, line, lineno, col):
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'''Метод для обработки ошибок, обнаруженных в ini-файле.
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line - пример строки;
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lineno - номер строки;
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col - номер символа.'''
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pass
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