import re from prompt_toolkit.document import Document def print_word_before_cursor(document: Document, pattern: re.Pattern | None = None): text = document.text word = document.get_word_before_cursor(pattern=pattern) print(f"Text: {text!r}, Cursor Position: {document.cursor_position}, Word Before Cursor: {word!r}") if __name__ == "__main__": text = "Fubar " document = Document(text=text, cursor_position=len(text)) # Show correct documented behavior: # The get_word_before_cursor() method returns '' since the cursor # is at a whitespace character. print_word_before_cursor(document) # Correct behavior: returns '' # Show incorrect behavior: # Using the same word search pattern as the library does, # the get_word_before_cursor() method now returns 'Fubar ' even though the cursor # is at a whitespace character. _FIND_WORD_RE = re.compile(r"([a-zA-Z0-9_]+|[^a-zA-Z0-9_\s]+)") # copied verbatim from prompt_toolkit/document.py print_word_before_cursor(document, pattern=_FIND_WORD_RE) # Incorrect behavior: returns 'Fubar '

text = "" if doc.char_before_cursor.isspace() else doc.get_word_before_cursor(pattern=mypattern)