70 lines
3.0 KiB
Python
70 lines
3.0 KiB
Python
|
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)
|
||
|
|
))
|
||
|
|
)
|