mirror of https://github.com/dense-analysis/ale
118 lines
4.0 KiB
Python
Executable File
118 lines
4.0 KiB
Python
Executable File
#!/usr/bin/env python
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"""
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This script checks for missing or forbidden blank lines before or after
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particular Vim commands. This script ensures that VimL scripts are padded
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correctly, so they are easier to read.
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"""
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import sys
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import re
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INDENTATION_RE = re.compile(r'^ *')
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COMMENT_LINE_RE = re.compile(r'^ *"')
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COMMAND_RE = re.compile(r'^ *([a-zA-Z]+)')
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START_BLOCKS = set(['if', 'for', 'while', 'try', 'function'])
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END_BLOCKS = set(['endif', 'endfor', 'endwhile', 'endtry', 'endfunction'])
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MIDDLE_BLOCKS = set(['else', 'elseif', 'catch', 'finally'])
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TERMINATORS = set(['return', 'throw'])
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WHITESPACE_BEFORE_SET = START_BLOCKS | TERMINATORS
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WHITESPACE_FORBIDDEN_BEFORE_SET = END_BLOCKS | MIDDLE_BLOCKS
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WHITESPACE_AFTER_SET = END_BLOCKS
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WHITESPACE_FORBIDDEN_AFTER_SET = START_BLOCKS | MIDDLE_BLOCKS
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def remove_comment_lines(line_iter):
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for line_number, line in enumerate(line_iter, 1):
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if not COMMENT_LINE_RE.match(line):
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yield (line_number, line)
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def check_lines(line_iter):
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previous_indentation_level = None
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previous_command = None
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previous_line_blank = False
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for line_number, line in remove_comment_lines(line_iter):
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if len(line) == 0:
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# Check for commands where we shouldn't have blank lines after
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# them, like `else` or the start of blocks like `function`.
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if (
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previous_command is not None
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and previous_command in WHITESPACE_FORBIDDEN_AFTER_SET
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):
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yield (
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line_number,
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'Blank line forbidden after `%s`' % (command,)
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)
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previous_line_blank = True
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previous_command = None
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else:
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indentation_level = INDENTATION_RE.match(line).end()
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command_match = COMMAND_RE.match(line)
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if command_match:
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command = command_match.group(1)
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# Check for commands requiring blank lines before them, if they
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# aren't at the start of a block.
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if (
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command in WHITESPACE_BEFORE_SET
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and previous_indentation_level is not None
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and indentation_level == previous_indentation_level
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and previous_line_blank is False
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):
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yield (
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line_number,
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'Blank line required before `%s`' % (command,)
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)
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# Check for commands where we shouldn't have blank lines before
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# them, like `else` or the end of blocks like `endfunction`.
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if (
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command in WHITESPACE_FORBIDDEN_BEFORE_SET
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and previous_line_blank is True
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):
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yield (
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line_number - 1,
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'Blank line forbidden before `%s`' % (command,)
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)
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# Check for commands requiring blank lines after them, if they
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# aren't at the end of a block.
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if (
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previous_command is not None
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and previous_command in WHITESPACE_AFTER_SET
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and previous_indentation_level is not None
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and indentation_level == previous_indentation_level
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and previous_line_blank is False
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):
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yield (
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line_number - 1,
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'Blank line required after `%s`' % (command,)
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)
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previous_command = command
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previous_line_blank = False
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previous_indentation_level = indentation_level
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def main():
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status = 0
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for filename in sys.argv[1:]:
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with open(filename) as vim_file:
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line_iter = (line.rstrip() for line in vim_file)
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for line_number, message in check_lines(line_iter):
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print('%s:%d %s' % (filename, line_number, message))
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status = 1
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sys.exit(status)
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if __name__ == "__main__":
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main()
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