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from coalib.bearlib.abstractions.SectionCreatable import SectionCreatable |
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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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def get_indentation(self, line): |
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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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if not isinstance(line, str): |
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raise TypeError("The 'line' parameter should be a string.") |
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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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def replace_tabs_with_spaces(self, line): |
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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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if not isinstance(line, str): |
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raise TypeError("The 'line' parameter should be a string.") |
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result = "" |
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tabless_position = 0 |
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for char in line: |
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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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result += space_count * " " |
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tabless_position += space_count |
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continue |
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result += char |
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tabless_position += 1 |
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return result |
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def replace_spaces_with_tabs(self, line): |
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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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if not isinstance(line, str): |
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raise TypeError("The 'line' parameter should be a string.") |
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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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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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result += currspaces*" " + char |
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currspaces = 0 |
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tabless_position += 1 |
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# tabless_position is now incremented to point _after_ the current |
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# char |
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if tabless_position % self.tab_width == 0: |
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if currspaces > 1: |
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result += "\t" |
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else: |
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result += currspaces*" " |
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currspaces = 0 |
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result += currspaces*" " |
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return result |
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coala-analyzer /
coala
