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from coalib.misc.StringConverter import StringConverter |
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from coalib.parsing.StringProcessing import unescape, convert_to_raw |
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class LineParser: |
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def __init__(self, |
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key_value_delimiters=('=',), |
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comment_seperators=('#',), |
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key_delimiters=(',', ' '), |
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section_name_surroundings=None, |
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section_override_delimiters=(".",)): |
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""" |
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Creates a new line parser. Please note that no delimiter or seperator |
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may be an "o" or you may encounter undefined behaviour with the |
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escapes. |
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:param key_value_delimiters: Delimiters that delimit a key from |
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a value |
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:param comment_seperators: Used to initiate a comment |
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:param key_delimiters: Delimiters between several keys |
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:param section_name_surroundings: Dictionary, e.g. {"[", "]"} means a |
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section name is surrounded by []. |
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If None, {"[": "]"} is used as |
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default. |
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:param section_override_delimiters: Delimiter for a section override. |
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E.g. "." would mean that |
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section.key is a possible key that |
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puts the key into the section |
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"section" despite of the current |
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section. |
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""" |
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section_name_surroundings = section_name_surroundings or {"[": "]"} |
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self.key_value_delimiters = key_value_delimiters |
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self.comment_seperators = comment_seperators |
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self.key_delimiters = key_delimiters |
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self.section_name_surroundings = section_name_surroundings |
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self.section_override_delimiters = section_override_delimiters |
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def parse(self, line): |
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""" |
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Note that every value in the returned touple *besides the value* is |
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unescaped. This is so since the value is meant to be put into a Setting |
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later thus the escapes may be needed there. |
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:param line: the line to parse |
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:return: section_name (empty string if it's no section name), |
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[(section_override, key), ...], value, comment |
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""" |
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line, comment = self.__seperate_by_first_occurrence( |
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line, |
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self.comment_seperators) |
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comment = unescape(comment) |
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if line == "": |
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return '', [], '', comment |
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section_name = unescape(self.__get_section_name(line)) |
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if section_name != '': |
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return section_name, [], '', comment |
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# Escapes in value might be needed by the bears |
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keys, value = self.__extract_keys_and_value(line) |
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# Add all the delimiters that stored as tuples |
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all_delimiters = self.key_value_delimiters |
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all_delimiters += self.key_delimiters |
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all_delimiters += self.comment_seperators |
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all_delimiters += self.section_override_delimiters |
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all_delimiters = "".join(all_delimiters) |
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# Add all keys and values in section_name_surroundings, which is |
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# stored as a dict |
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all_delimiters += "".join(self.section_name_surroundings.keys()) |
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all_delimiters += "".join(self.section_name_surroundings.values()) |
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value = convert_to_raw(value, all_delimiters) |
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key_touples = [] |
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for key in keys: |
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key = convert_to_raw(key, all_delimiters) |
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section, key = self.__seperate_by_first_occurrence( |
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key, |
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self.section_override_delimiters, |
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True, |
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True) |
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key_touples.append((unescape(section), unescape(key))) |
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return '', key_touples, value, comment |
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@staticmethod |
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def __seperate_by_first_occurrence(string, |
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delimiters, |
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strip_delim=False, |
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return_second_part_nonempty=False): |
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""" |
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Seperates a string by the first of all given delimiters. Any whitespace |
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characters will be stripped away from the parts. |
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:param string: The string to seperate. |
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:param delimiters: The delimiters. |
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:param strip_delim: Strips the delimiter from the |
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result if true. |
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:param return_second_part_nonempty: If no delimiter is found and this |
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is true the contents of the string |
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will be returned in the second part |
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of the touple instead of the first |
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one. |
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:return: (first_part, second_part) |
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""" |
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temp_string = string.replace("\\\\", "oo") |
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i = temp_string.find("\\") |
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while i != -1: |
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temp_string = temp_string[:i] + "oo" + temp_string[i+2:] |
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i = temp_string.find("\\", i+2) |
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delim_pos = len(string) |
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used_delim = "" |
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for delim in delimiters: |
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pos = temp_string.find(delim) |
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if 0 <= pos < delim_pos: |
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delim_pos = pos |
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used_delim = delim |
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if return_second_part_nonempty and delim_pos == len(string): |
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return "", string.strip(" \n") |
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return ( |
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string[:delim_pos].strip(" \n"), |
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string[delim_pos + (len(used_delim) if strip_delim else 0):].strip( |
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" \n")) |
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def __get_section_name(self, line): |
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for begin, end in self.section_name_surroundings.items(): |
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if (line[0:len(begin)] == begin and |
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line[len(line) - len(end):len(line)] == end): |
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return line[len(begin):len(line) - len(end)].strip(" \n") |
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return '' |
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def __extract_keys_and_value(self, line): |
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key_part, value = self.__seperate_by_first_occurrence( |
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line, |
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self.key_value_delimiters, |
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True, |
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True) |
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keys = list(StringConverter( |
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key_part, |
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list_delimiters=self.key_delimiters).__iter__( |
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remove_backslashes=False)) |
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return keys, value |
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coala-analyzer /
coala
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