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- r"""
- Terminal escape sequence patterns.
- This module provides regex patterns for matching terminal escape sequences. All patterns match
- sequences that begin with ESC (\\x1b). Before calling re.match with these patterns, callers should
- first check that the character at the current position is ESC for optimal performance.
- """
- # std imports
- import re
- # Zero-width escape sequences (SGR, OSC, CSI, etc.). This table, like INDETERMINATE_EFFECT_SEQUENCE,
- # originated from the 'blessed' library.
- ZERO_WIDTH_PATTERN = re.compile(
- # CSI sequences
- r'\x1b\[[\x30-\x3f]*[\x20-\x2f]*[\x40-\x7e]|'
- # OSC sequences
- r'\x1b\][^\x07\x1b]*(?:\x07|\x1b\\)|'
- # APC sequences
- r'\x1b_[^\x1b\x07]*(?:\x07|\x1b\\)|'
- # DCS sequences
- r'\x1bP[^\x1b\x07]*(?:\x07|\x1b\\)|'
- # PM sequences
- r'\x1b\^[^\x1b\x07]*(?:\x07|\x1b\\)|'
- # Character set designation
- r'\x1b[()].|'
- # Fe sequences
- r'\x1b[\x40-\x5f]|'
- # Fp sequences
- r'\x1b[78=>g]'
- )
- # Cursor right movement: CSI [n] C, parameter may be parsed by width()
- CURSOR_RIGHT_SEQUENCE = re.compile(r'\x1b\[(\d*)C')
- # Cursor left movement: CSI [n] D, parameter may be parsed by width()
- CURSOR_LEFT_SEQUENCE = re.compile(r'\x1b\[(\d*)D')
- # Indeterminate effect sequences - raise ValueError in 'strict' mode. The effects of these sequences
- # are likely to be undesirable, moving the cursor vertically or to any unknown position, and
- # otherwise not managed by the 'width' method of this library.
- #
- # This table was created initially with code generation by extraction of termcap library with
- # techniques used at 'blessed' library runtime for 'xterm', 'alacritty', 'kitty', ghostty',
- # 'screen', 'tmux', and others. Then, these common capabilities were merged into the list below.
- INDETERMINATE_EFFECT_SEQUENCE = re.compile(
- '|'.join(f'(?:{_pattern})' for _pattern in (
- r'\x1b\[\d+;\d+r', # change_scroll_region
- r'\x1b\[\d*K', # erase_in_line (clr_eol, clr_bol)
- r'\x1b\[\d*J', # erase_in_display (clr_eos, erase_display)
- r'\x1b\[\d*G', # column_address
- r'\x1b\[\d+;\d+H', # cursor_address
- r'\x1b\[\d*H', # cursor_home
- r'\x1b\[\d*A', # cursor_up
- r'\x1b\[\d*B', # cursor_down
- r'\x1b\[\d*P', # delete_character
- r'\x1b\[\d*M', # delete_line
- r'\x1b\[\d*L', # insert_line
- r'\x1b\[\d*@', # insert_character
- r'\x1b\[\d+X', # erase_chars
- r'\x1b\[\d*S', # scroll_up (parm_index)
- r'\x1b\[\d*T', # scroll_down (parm_rindex)
- r'\x1b\[\d*d', # row_address
- r'\x1b\[\?1049[hl]', # alternate screen buffer
- r'\x1b\[\?47[hl]', # alternate screen (legacy)
- r'\x1b8', # restore_cursor
- r'\x1bD', # scroll_forward (index)
- r'\x1bM', # scroll_reverse (reverse index)
- ))
- )
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