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from coalib.bearlib.abstractions.SectionCreatable import SectionCreatable |
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from coala_utils.decorators import enforce_signature |
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class SpacingHelper(SectionCreatable): |
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DEFAULT_TAB_WIDTH = 4 |
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def __init__(self, tab_width: int=DEFAULT_TAB_WIDTH): |
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""" |
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Creates a helper object for spacing operations. |
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:param tab_width: The number of spaces which visually equals a tab. |
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""" |
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SectionCreatable.__init__(self) |
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if not isinstance(tab_width, int): |
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raise TypeError("The 'tab_width' parameter should be an integer.") |
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self.tab_width = tab_width |
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@enforce_signature |
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def get_indentation(self, line: str): |
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""" |
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Checks the lines indentation. |
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:param line: A string to check for indentation. |
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:return: The indentation count in spaces. |
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""" |
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count = 0 |
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for char in line: |
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if char == ' ': |
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count += 1 |
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continue |
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if char == '\t': |
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count += self.tab_width - (count % self.tab_width) |
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continue |
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break |
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return count |
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@enforce_signature |
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def replace_tabs_with_spaces(self, line: str): |
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""" |
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Replaces tabs in this line with the appropriate number of spaces. |
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Example: " \t" will be converted to " ", assuming the tab_width is |
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set to 4. |
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:param line: The string with tabs to replace. |
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:return: A string with no tabs. |
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""" |
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for t_position, t_length in sorted(self.yield_tab_lengths(line), |
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reverse=True): |
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line = line[:t_position] + t_length * ' ' + line[t_position+1:] |
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return line |
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@enforce_signature |
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def yield_tab_lengths(self, input: str): |
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""" |
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Yields position and size of tabs in a input string. |
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:param input: The string with tabs. |
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""" |
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tabless_position = 0 |
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for index, char in enumerate(input): |
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if char == '\t': |
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space_count = (self.tab_width - tabless_position |
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% self.tab_width) |
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yield index, space_count |
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tabless_position += space_count |
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continue |
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tabless_position += 1 |
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@enforce_signature |
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def replace_spaces_with_tabs(self, line: str): |
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""" |
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Replaces spaces with tabs where possible. However in no case only one |
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space will be replaced by a tab. |
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Example: " \t a_text another" will be converted to |
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"\t a_text\tanother", assuming the tab_width is set to 4. |
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:param line: The string with spaces to replace. |
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:return: The converted string. |
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""" |
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def previous_whitespace(): |
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# Find the previous real character, and remaining chars to fill tab |
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non_whitespace_position = tabless_position - currspaces |
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tab_fill = non_whitespace_position % self.tab_width |
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if tab_fill and tab_fill + currspaces >= self.tab_width: |
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whitespace = "\t" |
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remaining_spaces = currspaces - (self.tab_width - tab_fill) |
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else: |
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whitespace = "" |
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remaining_spaces = currspaces |
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whitespace += "\t" * (remaining_spaces // self.tab_width) |
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whitespace += " " * (remaining_spaces % self.tab_width) |
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return whitespace |
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currspaces = 0 |
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result = "" |
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# Tracking the index of the string isnt enough because tabs are |
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# spanning over multiple columns |
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tabless_position = 0 |
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previous_char = None |
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for char in line: |
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if char == " ": |
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currspaces += 1 |
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tabless_position += 1 |
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elif char == "\t": |
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space_count = (self.tab_width - tabless_position |
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% self.tab_width) |
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currspaces += space_count |
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tabless_position += space_count |
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else: |
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if currspaces: |
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if currspaces == 1: |
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result += previous_char |
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else: |
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ws = previous_whitespace() |
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result += ws |
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result += char |
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currspaces = 0 |
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tabless_position += 1 |
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previous_char = char |
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if currspaces: |
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if currspaces == 1: |
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result += previous_char |
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else: |
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char = None |
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result += previous_whitespace() |
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return result |
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coala-analyzer /
coala
