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75 lines
3.3 KiB
Python
75 lines
3.3 KiB
Python
import tokenize
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# I don't think this is a minimized state machine, but it's clearer this
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# way. Namely, the class vs. function states can be merged
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# In the start of the module when we're expecting possibly a string that gets marked as a docstring
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STATE_EXPECT_MODULE_DOCSTRING = 0
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# After seeing the class keyword, we're waiting for the block colon (and do bracket counting)
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STATE_EXPECT_CLASS_COLON = 1
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# After seeing the colon in a class definition we're expecting possibly a docstring
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STATE_EXPECT_CLASS_DOCSTRING = 2
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# Same as EXPECT_CLASS_COLON, but for function definitions
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STATE_EXPECT_FUNCTION_COLON = 3
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# Same as EXPECT_CLASS_DOCSTRING, but for function definitions
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STATE_EXPECT_FUNCTION_DOCSTRING = 4
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# Just skipping tokens until we observe a class or a def.
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STATE_OTHER = 5
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# These tokens don't matter here - they don't get in the way of docstrings
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TOKENS_TO_IGNORE = [
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tokenize.NEWLINE,
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tokenize.INDENT,
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tokenize.DEDENT,
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tokenize.NL,
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tokenize.COMMENT,
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]
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def get_docstring_tokens(tokens):
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state = STATE_EXPECT_MODULE_DOCSTRING
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# The number of currently open parentheses, square brackets, etc.
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# This doesn't check if they're properly balanced, i.e. there isn't ([)], but we shouldn't
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# need to - if they aren't, it shouldn't parse at all, so we ignore the bracket type
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bracket_count = 0
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docstring_tokens = set()
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for token in tokens:
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if token.type in TOKENS_TO_IGNORE:
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continue
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if token.type == tokenize.STRING:
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if state in [STATE_EXPECT_MODULE_DOCSTRING, STATE_EXPECT_CLASS_DOCSTRING,
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STATE_EXPECT_FUNCTION_DOCSTRING]:
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docstring_tokens.add(token)
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state = STATE_OTHER
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# A class means we'll expect the class token
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elif token.type == tokenize.NAME and token.string == 'class':
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state = STATE_EXPECT_CLASS_COLON
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# Just in case - they should be balanced normally
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bracket_count = 0
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# A def means we'll expect a colon after that
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elif token.type == tokenize.NAME and token.string == 'def':
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state = STATE_EXPECT_FUNCTION_COLON
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# Just in case - they should be balanced normally
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bracket_count = 0
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# If we get a colon and we're expecting it, move to the next state
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elif token.type == tokenize.OP and token.string == ':':
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# If there are still left brackets open, it must be something other than the block start
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if bracket_count == 0:
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if state == STATE_EXPECT_CLASS_COLON:
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state = STATE_EXPECT_CLASS_DOCSTRING
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elif state == STATE_EXPECT_FUNCTION_COLON:
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state = STATE_EXPECT_FUNCTION_DOCSTRING
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# Count opening and closing brackets in bracket_count
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elif token.type == tokenize.OP and token.string in ['(', '[', '{']:
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bracket_count += 1
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elif token.type == tokenize.OP and token.string in [')', ']', '}']:
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bracket_count -= 1
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# The token is not one of the recognized types. If we're expecting a colon, then all good,
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# but if we're expecting a docstring, it would no longer be a docstring
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elif state in [STATE_EXPECT_MODULE_DOCSTRING, STATE_EXPECT_CLASS_DOCSTRING,
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STATE_EXPECT_FUNCTION_DOCSTRING]:
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state = STATE_OTHER
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return docstring_tokens
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