pyte¶

pyte implements a mix of VT100, VT220 and VT520 specification, and aims to support most of the TERM=linux functionality.

Two classes: Stream, which parses the command stream and dispatches events for commands, and Screen which, when used with a stream maintains a buffer of strings representing the screen of a terminal.

pyte.streams¶

This module provides three stream implementations with different features; for starters, here’s a quick example of how streams are typically used:

>>> import pyte
>>>
>>> class Dummy(object):
...     def __init__(self):
...         self.y = 0
...
...     def cursor_up(self, count=None):
...         self.y += count or 1
...
>>> dummy = Dummy()
>>> stream = pyte.Stream()
>>> stream.attach(dummy)
>>> stream.feed(u"")  # Move the cursor up 5 rows.
>>> dummy.y
5

class pyte.streams.ListenerSpec(screen, only, before, after)¶

An entry in the Screen listeners queue.

after¶

Alias for field number 3

before¶

Alias for field number 2

only¶

Alias for field number 1

screen¶

Alias for field number 0

pyte.streams.noop(event)[source]¶

A noop before-after hook for ListenerSpec.

class pyte.streams.Stream[source]¶

A stream is a state machine that parses a stream of characters and dispatches events based on what it sees.

Note

Stream only accepts text as input, but if, for some reason, you need to feed it with bytes, consider using ByteStream instead.

See also

man console_codes

For details on console codes listed bellow in basic, escape, csi, sharp and percent.

basic = {'\x0b': 'linefeed', '\r': 'carriage_return', '\x0c': 'linefeed', '\x07': 'bell', '\x08': 'backspace', '\x0e': 'shift_out', '\t': 'tab', '\n': 'linefeed', '\x0f': 'shift_in'}¶

Control sequences, which don’t require any arguments.

escape = {'D': 'index', 'H': 'set_tab_stop', 'E': 'linefeed', 'M': 'reverse_index', '7': 'save_cursor', 'c': 'reset', '8': 'restore_cursor'}¶

non-CSI escape sequences.

sharp = {'8': 'alignment_display'}¶

“sharp” escape sequences – ESC # <N>.

percent = {'8': 'charset_utf8', '@': 'charset_default', 'G': 'charset_utf8'}¶

“percent” escape sequences (Linux sequence to select character set) – ESC % <C>.

csi = {'n': 'report_device_status', 'H': 'cursor_position', 'J': 'erase_in_display', 'd': 'cursor_to_line', 'B': 'cursor_down', 'l': 'reset_mode', 'X': 'erase_characters', 'f': 'cursor_position', 'P': 'delete_characters', '@': 'insert_characters', 'M': 'delete_lines', 'r': 'set_margins', 'C': 'cursor_forward', 'm': 'select_graphic_rendition', 'c': 'report_device_attributes', 'e': 'cursor_down', 'D': 'cursor_back', 'g': 'clear_tab_stop', 'E': 'cursor_down1', 'G': 'cursor_to_column', 'L': 'insert_lines', "'": 'cursor_to_column', 'F': 'cursor_up1', 'h': 'set_mode', 'K': 'erase_in_line', 'a': 'cursor_forward', 'A': 'cursor_up'}¶

CSI escape sequences – CSI P1;P2;...;Pn <fn>.

consume(char)[source]¶

Consumes a single string character and advance the state as necessary.

Parameters:	char (str) – a character to consume.

Deprecated since version 0.5.0: Use feed() instead.

feed(chars)[source]¶

Consumes a string and advance the state as necessary.

Parameters:	chars (str) – a string to feed from.

attach(screen, only=())[source]¶

Adds a given screen to the listener queue.

Parameters:	screen (pyte.screens.Screen) – a screen to attach to. only (list) – a list of events you want to dispatch to a given screen (empty by default, which means – dispatch all events).

detach(screen)[source]¶

Removes a given screen from the listener queue and fails silently if it’s not attached.

Parameters:	screen (pyte.screens.Screen) – a screen to detach.

dispatch(event, *args, **kwargs)[source]¶

Dispatches an event.

Event handlers are looked up implicitly in the screen’s __dict__, so, if a screen only wants to handle DRAW events it should define a draw() method or pass only=["draw"] argument to attach().

Warning

If any of the attached listeners throws an exception, the subsequent callbacks are be aborted.

Parameters:	event (str) – event to dispatch.

class pyte.streams.ByteStream(encodings=None)[source]¶

A stream, which takes bytes (instead of strings) as input and tries to decode them using a given list of possible encodings. It uses codecs.IncrementalDecoder internally, so broken bytes are not an issue.

By default, the following decoding strategy is used:

• First, try strict "utf-8", proceed if received and UnicodeDecodeError ...
• Try strict "cp437", failed? move on ...
• Use "utf-8" with invalid bytes replaced – this one will always succeed.

>>> stream = ByteStream()
>>> stream.feed(b"foo".decode("utf-8"))
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "pyte/streams.py", line 367, in feed
    "{0} requires input in bytes".format(self.__class__.__name__))
TypeError: ByteStream requires input in bytes
>>> stream.feed(b"foo")

Parameters:	encodings (list) – a list of (encoding, errors) pairs, where the first element is encoding name, ex: "utf-8" and second defines how decoding errors should be handled; see str.decode() for possible values.

class pyte.streams.DebugStream(to=<_io.TextIOWrapper name='<stdout>' mode='w' encoding='ANSI_X3.4-1968'>, only=(), *args, **kwargs)[source]¶

Stream, which dumps a subset of the dispatched events to a given file-like object (sys.stdout by default).

>>> stream = DebugStream()
>>> stream.feed("\x1b[1;24r\x1b[4l\x1b[24;1H\x1b[0;10m")
SET_MARGINS 1; 24
RESET_MODE 4
CURSOR_POSITION 24; 1
SELECT_GRAPHIC_RENDITION 0; 10

Parameters:	to (file) – a file-like object to write debug information to. only (list) – a list of events you want to debug (empty by default, which means – debug all events).

pyte.screens¶

This module provides classes for terminal screens, currently it contains three screens with different features:

• Screen – base screen implementation, which handles all the core escape sequences, recognized by Stream.
• If you need a screen to keep track of the changed lines (which you probably do need) – use DiffScreen.
• If you also want a screen to collect history and allow pagination – pyte.screen.HistoryScreen is here for ya ;)

class pyte.screens.Cursor(x, y, attrs=Char(data=' ', fg='default', bg='default', bold=False, italics=False, underscore=False, strikethrough=False, reverse=False))[source]¶

Screen cursor.

Parameters:	x (int) – 0-based horizontal cursor position. y (int) – 0-based vertical cursor position. attrs (pyte.screens.Char) – cursor attributes (see select_graphic_rendition() for details).

class pyte.screens.Screen(columns, lines)[source]¶

A screen is an in-memory matrix of characters that represents the screen display of the terminal. It can be instantiated on it’s own and given explicit commands, or it can be attached to a stream and will respond to events.

buffer¶

A lines x columns Char matrix.

cursor¶

Reference to the Cursor object, holding cursor position and attributes.

margins¶

Top and bottom screen margins, defining the scrolling region; the actual values are top and bottom line.

charset¶

Current charset number; can be either 0 or 1 for G0 and G1 respectively, note that G0 is activated by default.

Note

According to ECMA-48 standard, lines and columns are 1-indexed, so, for instance ESC [ 10;10 f really means – move cursor to position (9, 9) in the display matrix.

Changed in version 0.4.7.

Warning

LNM is reset by default, to match VT220 specification.

Changed in version 0.4.8.

Warning

If DECAWM mode is set than a cursor will be wrapped to the beginning of the next line, which is the behaviour described in man console_codes.

See also

Standard ECMA-48, Section 6.1.1 for a description of the presentational component, implemented by Screen.

default_char = Char(data=' ', fg='default', bg='default', bold=False, italics=False, underscore=False, strikethrough=False, reverse=False)¶

A plain empty character with default foreground and background colors.

default_line = repeat(Char(data=' ', fg='default', bg='default', bold=False, italics=False, underscore=False, strikethrough=False, reverse=False))¶

An infinite sequence of default characters, used for populating new lines and columns.

display¶

Returns a list() of screen lines as unicode strings.

reset()[source]¶

Resets the terminal to its initial state.

• Scroll margins are reset to screen boundaries.
• Cursor is moved to home location – (0, 0) and its attributes are set to defaults (see default_char).
• Screen is cleared – each character is reset to default_char.
• Tabstops are reset to “every eight columns”.

Note

Neither VT220 nor VT102 manuals mentioned that terminal modes and tabstops should be reset as well, thanks to xterm – we now know that.

resize(lines=None, columns=None)[source]¶

Resize the screen to the given dimensions.

If the requested screen size has more lines than the existing screen, lines will be added at the bottom. If the requested size has less lines than the existing screen lines will be clipped at the top of the screen. Similarly, if the existing screen has less columns than the requested screen, columns will be added at the right, and if it has more – columns will be clipped at the right.

Note

According to xterm, we should also reset origin mode and screen margins, see xterm/screen.c:1761.

Parameters:	lines (int) – number of lines in the new screen. columns (int) – number of columns in the new screen.

set_margins(top=None, bottom=None)[source]¶

Selects top and bottom margins for the scrolling region.

Margins determine which screen lines move during scrolling (see index() and reverse_index()). Characters added outside the scrolling region do not cause the screen to scroll.

Parameters:	top (int) – the smallest line number that is scrolled. bottom (int) – the biggest line number that is scrolled.

set_charset(code, mode)[source]¶

Set active G0 or G1 charset.

Parameters:	code (str) – character set code, should be a character from "B0UK" – otherwise ignored. mode (str) – if "(" G0 charset is set, if ")" – we operate on G1.

Warning

User-defined charsets are currently not supported.

set_mode(*modes, **kwargs)[source]¶

Sets (enables) a given list of modes.

Parameters:	modes (list) – modes to set, where each mode is a constant from pyte.modes.

reset_mode(*modes, **kwargs)[source]¶

Resets (disables) a given list of modes.

Parameters:	modes (list) – modes to reset – hopefully, each mode is a constant from pyte.modes.

shift_in()[source]¶

Activates G0 character set.

shift_out()[source]¶

Activates G1 character set.

draw(char)[source]¶

Display a character at the current cursor position and advance the cursor if DECAWM is set.

Parameters:	char (str) – a character to display.

Changed in version 0.5.0: Character width is taken into account. Specifically, zero-width and unprintable characters do not affect screen state. Full-width characters are rendered into two consecutive character containers.

carriage_return()[source]¶

Move the cursor to the beginning of the current line.

index()[source]¶

Move the cursor down one line in the same column. If the cursor is at the last line, create a new line at the bottom.

reverse_index()[source]¶

Move the cursor up one line in the same column. If the cursor is at the first line, create a new line at the top.

linefeed()[source]¶

Performs an index and, if LNM is set, a carriage return.

tab()[source]¶

Move to the next tab space, or the end of the screen if there aren’t anymore left.

backspace()[source]¶

Move cursor to the left one or keep it in it’s position if it’s at the beginning of the line already.

save_cursor()[source]¶

Push the current cursor position onto the stack.

restore_cursor()[source]¶

Set the current cursor position to whatever cursor is on top of the stack.

insert_lines(count=None)[source]¶

Inserts the indicated # of lines at line with cursor. Lines displayed at and below the cursor move down. Lines moved past the bottom margin are lost.

Parameters:	count – number of lines to delete.

delete_lines(count=None)[source]¶

Deletes the indicated # of lines, starting at line with cursor. As lines are deleted, lines displayed below cursor move up. Lines added to bottom of screen have spaces with same character attributes as last line moved up.

Parameters:	count (int) – number of lines to delete.

insert_characters(count=None)[source]¶

Inserts the indicated # of blank characters at the cursor position. The cursor does not move and remains at the beginning of the inserted blank characters. Data on the line is shifted forward.

Parameters:	count (int) – number of characters to insert.

delete_characters(count=None)[source]¶

Deletes the indicated # of characters, starting with the character at cursor position. When a character is deleted, all characters to the right of cursor move left. Character attributes move with the characters.

Parameters:	count (int) – number of characters to delete.

erase_characters(count=None)[source]¶

Erases the indicated # of characters, starting with the character at cursor position. Character attributes are set cursor attributes. The cursor remains in the same position.

Parameters:	count (int) – number of characters to erase.

Warning

Even though ALL of the VTXXX manuals state that character attributes should be reset to defaults, libvte, xterm and ROTE completely ignore this. Same applies too all erase_*() and delete_*() methods.

erase_in_line(how=0, private=False)[source]¶

Erases a line in a specific way.

Parameters:	how (int) – defines the way the line should be erased in: 0 – Erases from cursor to end of line, including cursor position. 1 – Erases from beginning of line to cursor, including cursor position. 2 – Erases complete line. private (bool) – when True character attributes are left unchanged not implemented.

erase_in_display(how=0, private=False)[source]¶

Erases display in a specific way.

Parameters:	how (int) – defines the way the line should be erased in: 0 – Erases from cursor to end of screen, including cursor position. 1 – Erases from beginning of screen to cursor, including cursor position. 2 – Erases complete display. All lines are erased and changed to single-width. Cursor does not move. private (bool) – when True character attributes are left unchanged not implemented.

set_tab_stop()[source]¶

Sets a horizontal tab stop at cursor position.

clear_tab_stop(how=0)[source]¶

Clears a horizontal tab stop.

Parameters:	how (int) – defines a way the tab stop should be cleared: 0 or nothing – Clears a horizontal tab stop at cursor position. 3 – Clears all horizontal tab stops.

ensure_bounds(use_margins=None)[source]¶

Ensure that current cursor position is within screen bounds.

Parameters:	use_margins (bool) – when True or when DECOM is set, cursor is bounded by top and and bottom margins, instead of [0; lines - 1].

cursor_up(count=None)[source]¶

Moves cursor up the indicated # of lines in same column. Cursor stops at top margin.

Parameters:	count (int) – number of lines to skip.

cursor_up1(count=None)[source]¶

Moves cursor up the indicated # of lines to column 1. Cursor stops at bottom margin.

Parameters:	count (int) – number of lines to skip.

cursor_down(count=None)[source]¶

Moves cursor down the indicated # of lines in same column. Cursor stops at bottom margin.

Parameters:	count (int) – number of lines to skip.

cursor_down1(count=None)[source]¶

Moves cursor down the indicated # of lines to column 1. Cursor stops at bottom margin.

Parameters:	count (int) – number of lines to skip.

cursor_back(count=None)[source]¶

Moves cursor left the indicated # of columns. Cursor stops at left margin.

Parameters:	count (int) – number of columns to skip.

cursor_forward(count=None)[source]¶

Moves cursor right the indicated # of columns. Cursor stops at right margin.

Parameters:	count (int) – number of columns to skip.

cursor_position(line=None, column=None)[source]¶

Set the cursor to a specific line and column.

Cursor is allowed to move out of the scrolling region only when DECOM is reset, otherwise – the position doesn’t change.

Parameters:	line (int) – line number to move the cursor to. column (int) – column number to move the cursor to.

cursor_to_column(column=None)[source]¶

Moves cursor to a specific column in the current line.

Parameters:	column (int) – column number to move the cursor to.

cursor_to_line(line=None)[source]¶

Moves cursor to a specific line in the current column.

Parameters:	line (int) – line number to move the cursor to.

bell(*args)[source]¶

Bell stub – the actual implementation should probably be provided by the end-user.

alignment_display()[source]¶

Fills screen with uppercase E’s for screen focus and alignment.

select_graphic_rendition(*attrs)[source]¶

Set display attributes.

Parameters:	attrs (list) – a list of display attributes to set.

report_device_attributes()[source]¶

Reports terminal identity.

New in version 0.5.0.

report_device_status(mode)[source]¶

Reports terminal status or cursor position.

Parameters:	mode (int) – if 5 – terminal status, 6 – cursor position, otherwise a noop.

New in version 0.5.0.

write_process_input(data)[source]¶

Writes data to the process running inside the terminal.

By default is a noop.

Parameters:	data (str) – data to write to the process stdin.

New in version 0.5.0.

class pyte.screens.DiffScreen(*args)[source]¶

A screen subclass, which maintains a set of dirty lines in its dirty attribute. The end user is responsible for emptying a set, when a diff is applied.

dirty¶

A set of line numbers, which should be re-drawn.

>>> screen = DiffScreen(80, 24)
>>> screen.dirty.clear()
>>> screen.draw(u"!")
>>> screen.dirty
set([0])

class pyte.screens.HistoryScreen(columns, lines, history=100, ratio=0.5)[source]¶

A screen subclass, which keeps track of screen history and allows pagination. This is not linux-specific, but still useful; see page 462 of VT520 User’s Manual.

Parameters:	history (int) – total number of history lines to keep; is split between top and bottom queues. ratio (int) – defines how much lines to scroll on next_page() and prev_page() calls.

history¶

A pair of history queues for top and bottom margins accordingly; here’s the overall screen structure:

[ 1: .......]
[ 2: .......]  <- top history
[ 3: .......]
------------
[ 4: .......]  s
[ 5: .......]  c
[ 6: .......]  r
[ 7: .......]  e
[ 8: .......]  e
[ 9: .......]  n
------------
[10: .......]
[11: .......]  <- bottom history
[12: .......]

Note

Don’t forget to update Stream class with appropriate escape sequences – you can use any, since pagination protocol is not standardized, for example:

Stream.escape["N"] = "next_page"
Stream.escape["P"] = "prev_page"

reset()[source]¶

Overloaded to reset screen history state: history position is reset to bottom of both queues; queues themselves are emptied.

index()[source]¶

Overloaded to update top history with the removed lines.

reverse_index()[source]¶

Overloaded to update bottom history with the removed lines.

prev_page()[source]¶

Moves the screen page up through the history buffer. Page size is defined by history.ratio, so for instance ratio = .5 means that half the screen is restored from history on page switch.

next_page()[source]¶

Moves the screen page down through the history buffer.

pyte.modes¶

This module defines terminal mode switches, used by Screen. There’re two types of terminal modes:

• non-private which should be set with ESC [ N h, where N is an integer, representing mode being set; and
• private which should be set with ESC [ ? N h.

The latter are shifted 5 times to the right, to be easily distinguishable from the former ones; for example Origin Mode – DECOM is 192 not 6.

>>> DECOM
192

pyte.modes.LNM = 20¶

Line Feed/New Line Mode: When enabled, causes a received LF, pyte.control.FF, or VT to move the cursor to the first column of the next line.

pyte.modes.IRM = 4¶

Insert/Replace Mode: When enabled, new display characters move old display characters to the right. Characters moved past the right margin are lost. Otherwise, new display characters replace old display characters at the cursor position.

pyte.modes.DECTCEM = 800¶

Text Cursor Enable Mode: determines if the text cursor is visible.

pyte.modes.DECSCNM = 160¶

Screen Mode: toggles screen-wide reverse-video mode.

pyte.modes.DECOM = 192¶

Origin Mode: allows cursor addressing relative to a user-defined origin. This mode resets when the terminal is powered up or reset. It does not affect the erase in display (ED) function.

pyte.modes.DECAWM = 224¶

Auto Wrap Mode: selects where received graphic characters appear when the cursor is at the right margin.

pyte.modes.DECCOLM = 96¶

Column Mode: selects the number of columns per line (80 or 132) on the screen.

pyte.control¶

This module defines simple control sequences, recognized by Stream, the set of codes here is for TERM=linux which is a superset of VT102.

pyte.control.SP = ' '¶

Space: Not suprisingly – " ".

pyte.control.NUL = '\x00'¶

Null: Does nothing.

pyte.control.BEL = '\x07'¶

Bell: Beeps.

pyte.control.BS = '\x08'¶

Backspace: Backspace one column, but not past the begining of the line.

pyte.control.HT = '\t'¶

Horizontal tab: Move cursor to the next tab stop, or to the end of the line if there is no earlier tab stop.

pyte.control.LF = '\n'¶

Linefeed: Give a line feed, and, if pyte.modes.LNM (new line mode) is set also a carriage return.

pyte.control.VT = '\x0b'¶

Vertical tab: Same as LF.

pyte.control.FF = '\x0c'¶

Form feed: Same as LF.

pyte.control.CR = '\r'¶

Carriage return: Move cursor to left margin on current line.

pyte.control.SO = '\x0e'¶

Shift out: Activate G1 character set.

pyte.control.SI = '\x0f'¶

Shift in: Activate G0 character set.

pyte.control.CAN = '\x18'¶

Cancel: Interrupt escape sequence. If received during an escape or control sequence, cancels the sequence and displays substitution character.

pyte.control.SUB = '\x1a'¶

Substitute: Same as CAN.

pyte.control.ESC = '\x1b'¶

Escape: Starts an escape sequence.

pyte.control.DEL = '\x7f'¶

Delete: Is ignored.

pyte.control.CSI = '\x9b'¶

Control sequence introducer: An equivalent for ESC [.

pyte.escape¶

This module defines both CSI and non-CSI escape sequences, recognized by Stream and subclasses.

pyte.escape.RIS = 'c'¶

Reset.

pyte.escape.IND = 'D'¶

Index: Move cursor down one line in same column. If the cursor is at the bottom margin, the screen performs a scroll-up.

pyte.escape.NEL = 'E'¶

Next line: Same as pyte.control.LF.

pyte.escape.HTS = 'H'¶

Tabulation set: Set a horizontal tab stop at cursor position.

pyte.escape.RI = 'M'¶

Reverse index: Move cursor up one line in same column. If the cursor is at the top margin, the screen performs a scroll-down.

pyte.escape.DECSC = '7'¶

Save cursor: Save cursor position, character attribute (graphic rendition), character set, and origin mode selection (see DECRC).

pyte.escape.DECRC = '8'¶

Restore cursor: Restore previously saved cursor position, character attribute (graphic rendition), character set, and origin mode selection. If none were saved, move cursor to home position.

pyte.escape.DEFAULT = '@'¶

Select default (ISO 646 / ISO 8859-1).

pyte.escape.UTF8 = 'G'¶

Select UTF-8.

pyte.escape.UTF8_OBSOLETE = '8'¶

Select UTF-8 (obsolete).

pyte.escape.DECALN = '8'¶

Alignment display: Fill screen with uppercase E’s for testing screen focus and alignment.

pyte.escape.ICH = '@'¶

Insert character: Insert the indicated # of blank characters.

pyte.escape.CUU = 'A'¶

Cursor up: Move cursor up the indicated # of lines in same column. Cursor stops at top margin.

pyte.escape.CUD = 'B'¶

Cursor down: Move cursor down the indicated # of lines in same column. Cursor stops at bottom margin.

pyte.escape.CUF = 'C'¶

Cursor forward: Move cursor right the indicated # of columns. Cursor stops at right margin.

pyte.escape.CUB = 'D'¶

Cursor back: Move cursor left the indicated # of columns. Cursor stops at left margin.

pyte.escape.CNL = 'E'¶

Cursor next line: Move cursor down the indicated # of lines to column 1.

pyte.escape.CPL = 'F'¶

Cursor previous line: Move cursor up the indicated # of lines to column 1.

pyte.escape.CHA = 'G'¶

Cursor horizontal align: Move cursor to the indicated column in current line.

pyte.escape.CUP = 'H'¶

Cursor position: Move cursor to the indicated line, column (origin at 1, 1).

pyte.escape.ED = 'J'¶

Erase data (default: from cursor to end of line).

pyte.escape.EL = 'K'¶

Erase in line (default: from cursor to end of line).

pyte.escape.IL = 'L'¶

Insert line: Insert the indicated # of blank lines, starting from the current line. Lines displayed below cursor move down. Lines moved past the bottom margin are lost.

pyte.escape.DL = 'M'¶

Delete line: Delete the indicated # of lines, starting from the current line. As lines are deleted, lines displayed below cursor move up. Lines added to bottom of screen have spaces with same character attributes as last line move up.

pyte.escape.DCH = 'P'¶

Delete character: Delete the indicated # of characters on the current line. When character is deleted, all characters to the right of cursor move left.

pyte.escape.ECH = 'X'¶

Erase character: Erase the indicated # of characters on the current line.

pyte.escape.HPR = 'a'¶

Horizontal position relative: Same as CUF.

pyte.escape.DA = 'c'¶

Device Attributes.

pyte.escape.VPA = 'd'¶

Vertical position adjust: Move cursor to the indicated line, current column.

pyte.escape.VPR = 'e'¶

Vertical position relative: Same as CUD.

pyte.escape.HVP = 'f'¶

Horizontal / Vertical position: Same as CUP.

pyte.escape.TBC = 'g'¶

Tabulation clear: Clears a horizontal tab stop at cursor position.

pyte.escape.SM = 'h'¶

Set mode.

pyte.escape.RM = 'l'¶

Reset mode.

pyte.escape.SGR = 'm'¶

Select graphics rendition: The terminal can display the following character attributes that change the character display without changing the character (see pyte.graphics).

pyte.escape.DSR = 'n'¶

Device status report.

pyte.escape.DECSTBM = 'r'¶

Select top and bottom margins: Selects margins, defining the scrolling region; parameters are top and bottom line. If called without any arguments, whole screen is used.

pyte.escape.HPA = "'"¶

Horizontal position adjust: Same as CHA.

pyte.graphics¶

This module defines graphic-related constants, mostly taken from console_codes(4) and http://pueblo.sourceforge.net/doc/manual/ansi_color_codes.html.

pyte.graphics.TEXT = {27: '-reverse', 1: '+bold', 3: '+italics', 4: '+underscore', 22: '-bold', 7: '+reverse', 24: '-underscore', 9: '+strikethrough', 23: '-italics', 29: '-strikethrough'}¶

A mapping of ANSI text style codes to style names, “+” means the: attribute is set, “-” – reset; example:

>>> text[1]
'+bold'
>>> text[9]
'+strikethrough'

pyte.graphics.FG = {32: 'green', 33: 'brown', 34: 'blue', 35: 'magenta', 36: 'cyan', 37: 'white', 39: 'default', 30: 'black', 31: 'red'}¶

A mapping of ANSI foreground color codes to color names, example:

>>> FG[30]
'black'
>>> FG[38]
'default'

pyte.graphics.BG = {49: 'default', 40: 'black', 41: 'red', 42: 'green', 43: 'brown', 44: 'blue', 45: 'magenta', 46: 'cyan', 47: 'white'}¶

A mapping of ANSI background color codes to color names, example:

>>> BG[40]
'black'
>>> BG[48]
'default'

pyte.charsets¶

This module defines G0 and G1 charset mappings the same way they are defined for linux terminal, see linux/drivers/tty/consolemap.c @ http://git.kernel.org

pyte.charsets.LAT1_MAP = ['\x00', '\x01', '\x02', '\x03', '\x04', '\x05', '\x06', '\x07', '\x08', '\t', '\n', '\x0b', '\x0c', '\r', '\x0e', '\x0f', '\x10', '\x11', '\x12', '\x13', '\x14', '\x15', '\x16', '\x17', '\x18', '\x19', '\x1a', '\x1b', '\x1c', '\x1d', '\x1e', '\x1f', ' ', '!', '"', '#', '$', '%', '&', "'", '(', ')', '*', '+', ',', '-', '.', '/', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', ':', ';', '<', '=', '>', '?', '@', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', '[', '\\', ']', '^', '_', '`', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', '{', '|', '}', '~', '\x7f', '\x80', '\x81', '\x82', '\x83', '\x84', '\x85', '\x86', '\x87', '\x88', '\x89', '\x8a', '\x8b', '\x8c', '\x8d', '\x8e', '\x8f', '\x90', '\x91', '\x92', '\x93', '\x94', '\x95', '\x96', '\x97', '\x98', '\x99', '\x9a', '\x9b', '\x9c', '\x9d', '\x9e', '\x9f', '\xa0', '¡', '¢', '£', '¤', '¥', '¦', '§', '¨', '©', 'ª', '«', '¬', '\xad', '®', '¯', '°', '±', '²', '³', '´', 'µ', '¶', '·', '¸', '¹', 'º', '»', '¼', '½', '¾', '¿', 'À', 'Á', 'Â', 'Ã', 'Ä', 'Å', 'Æ', 'Ç', 'È', 'É', 'Ê', 'Ë', 'Ì', 'Í', 'Î', 'Ï', 'Ð', 'Ñ', 'Ò', 'Ó', 'Ô', 'Õ', 'Ö', '×', 'Ø', 'Ù', 'Ú', 'Û', 'Ü', 'Ý', 'Þ', 'ß', 'à', 'á', 'â', 'ã', 'ä', 'å', 'æ', 'ç', 'è', 'é', 'ê', 'ë', 'ì', 'í', 'î', 'ï', 'ð', 'ñ', 'ò', 'ó', 'ô', 'õ', 'ö', '÷', 'ø', 'ù', 'ú', 'û', 'ü', 'ý', 'þ', 'ÿ']¶

Latin1.

pyte.charsets.VT100_MAP = '\x00\x01\x02\x03\x04\x05\x06\x07\x08\t\n\x0b\x0c\r\x0e\x0f\x10\x11\x12\x13\x14\x15\x16\x17\x18\x19\x1a\x1b\x1c\x1d\x1e\x1f !"#$%&\'()*→←↑↓/█123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^\xa0◆▒␉␌␍␊°±░␋┘┐┌└┼⎺⎻─⎼⎽├┤┴┬│≤≥π≠£·\x7f\x80\x81\x82\x83\x84\x85\x86\x87\x88\x89\x8a\x8b\x8c\x8d\x8e\x8f\x90\x91\x92\x93\x94\x95\x96\x97\x98\x99\x9a\x9b\x9c\x9d\x9e\x9f\xa0¡¢£¤¥¦§¨©ª«¬\xad®¯°±²³´µ¶·¸¹º»¼½¾¿ÀÁÂÃÄÅÆÇÈÉÊËÌÍÎÏÐÑÒÓÔÕÖ×ØÙÚÛÜÝÞßàáâãäåæçèéêëìíîïðñòóôõö÷øùúûüýþÿ'¶

VT100 graphic character set.

pyte.charsets.IBMPC_MAP = '\x00☺☻♥♦♣♠•◘○◙♂♀♪♫☼▶◀↕‼¶§▬↨↑↓→←∟↔▲▼ !"#$%&\'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`abcdefghijklmnopqrstuvwxyz{|}~⌂ÇüéâäàåçêëèïîìÄÅÉæÆôöòûùÿÖÜ¢£¥₧ƒáíóúñѪº¿⌐¬½¼¡«»░▒▓│┤╡╢╖╕╣║╗╝╜╛┐└┴┬├─┼╞╟╚╔╩╦╠═╬╧╨╤╥╙╘╒╓╫╪┘┌█▄▌▐▀αßΓπΣσµτΦΘΩδ∞φε∩≡±≥≤⌠⌡÷≈°∙·√ⁿ²■\xa0'¶

IBM Codepage 437.

pyte.charsets.VAX42_MAP = '\x00☺☻♥♦♣♠•◘○◙♂♀♪♫☼▶◀↕‼¶§▬↨↑↓→←∟↔▲▼ л"#$%&\'()*+,-./0123456789:;<=>е@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`сbcdefgеijklmnкpqтsлеvwxyz{|}~⌂ÇüéâäàåçêëèïîìÄÅÉæÆôöòûùÿÖÜ¢£¥₧ƒáíóúñѪº¿⌐¬½¼¡«»░▒▓│┤╡╢╖╕╣║╗╝╜╛┐└┴┬├─┼╞╟╚╔╩╦╠═╬╧╨╤╥╙╘╒╓╫╪┘┌█▄▌▐▀αßΓπΣσµτΦΘΩδ∞φε∩≡±≥≤⌠⌡÷≈°∙·√ⁿ²■\xa0'¶

VAX42 character set.

Version 0.5.1¶

Bugfix release, released on January 10th 2015

• Fixed dependencies in setup.py.

Version 0.5.0¶

Released on January 10th 2015

• Deprecated Stream.consume in favour of Stream.feed. The latter allows for a more efficient implementation because it operates on the whole input string.
• Improved Stream performance by converting FSM to a coroutine as suggested by Jonathan Slenders in issue #41 on GitHub.
• Added support for DA (device attributes) and DSR (device status report). The implementation is based on the code by Jonathan Slenders. See issue #41 on GitHub.
• Screen.draw now properly handles full/ambiguous-width characters. Thanks to the excellent wcwidth library by Jeff Quast.
• Removed re-exports of abbreviated modules (e.g. mo as a synonym for modes) from pyte.
• Removed Screen.size which misleadingly returned constructor arguments in reverse order. Please use Screen.columns and Screen.lines instead.
• Fixed a bug in ByteStream which suppressed the exception if all of the decoders failed to process the input.

Version 0.4.10¶

Bugfix release, released on August 4th 2015

• Fixed a bug in DiffScreen.draw which marked the wrong line as changed when DECAWM was enabled.
• Stream now recognizes ESC % sequences for selecting control character set. However, these operations are no-op in the current version in a sense that ByteStream does not handle them to change encoding.

Version 0.4.9¶

Bugfix release, released on December 3rd 2014

• Fixed a bug in Char initialization, see issue #24 on GitHub for details.
• Updated error message in Stream, referencing str is relevant for Python 3, but not Python 2.

Version 0.4.8¶

Released on January 13th 2014

• Screen does NOT inherit from builtin list, use Screen.buffer to access individual characters directly. This is a backward INCOMPATIBLE change.
• Char._asdict was broken on Python 3.3 because of the changes in namedtuple implementation.
• LAT1_MAP was an iterator because of the change in map semantics in Python 3.
• Changed Screen to issues a CR in addition to LF when DECAWM mode is set and the cursor is at the right border of the screen. See http://www.vt100.net/docs/vt510-rm/DECAWM and issue #20 on GitHub for details.

Version 0.4.7¶

Bugfix release, released on March 28th 2013

• Updated pyte and tests suite to work under Python 3.3.
• Changed Screen so that LNM mode is reset by default, see http://www.vt100.net/docs/vt510-rm/LNM and issue #11 on GitHub for details.

Version 0.4.6¶

Bugfix release, released on February 29th 2012

Version 0.4.5¶

Technical release, released on September 1st 2011

• Added MANIFEST.in and CenOS spec file

Version 0.4.4¶

Bugfix release, released on July 17th 2011

• Removed pdb calls, left from HistoryScreen debugging – silly, I know :)

Version 0.4.3¶

Bugfix release, released on July 12th 2011

• Fixed encoding issues in DebugStream – Unicode was not converted to bytes properly.
• Fixed G0-1 charset handling and added VAX42 charset for the ancient stuff to work correctly.

Version 0.4.2¶

Bugfix release, released on June 27th 2011

• Added a tiny debugging helper: python -m pyte your escape codes
• Added Screen.__{before,after}__() hooks to Screen – now subclasses can extend more than one command easily.
• Fixed HistoryScreen – now not as buggy as it used to be: and allows for custom ratio aspect when browsing history, see HistoryScreen documentation for details.
• Fixed DECTCEM private mode handling – when the mode is reset Screen.cursor.hidden is True otherwise it’s False.

Version 0.4.1¶

Bugfix release, released on June 21st 2011

• Minor examples and documentation update before the first public release.

Version 0.4.0¶

Released on June 21st 2011

• Improved cursor movement – Screen passes all but one tests in vttest.
• Changed the way Stream interacts with Screen – event handlers are now implicitly looked up in screen’s __dict__, not connected manually.
• Changed cursor API – cursor position and attributes are encapsulated in a separate Cursor class.
• Added support for DECSCNM – toggle screen-wide reverse-video mode.
• Added a couple of useful Screen subclasses: HistoryScreen which allows screen pagination and DiffScreen which tracks the changed lines.

Version 0.3.9¶

Released on May 31st 2011

• Added initial support for G0-1 charsets (mappings taken from tty kernel driver) and SI, SO escape sequences.
• Changed ByteStream to support fallback encodings – it now takes a list of (encoding, errors) pairs and traverses it left to right on feed().
• Switched to unicode_literals – one step closer to Python3.

Version 0.3.8¶

Released on May 23rd 2011

• Major rewrite of Screen internals – highlights: inherits from list; each character is represented by namedtuple which also holds SGR data.
• Numerous bugfixes, especially in methods, dealing with manipulating character attributes.

Version 0.3.7¶

First release after the adoption – skipped a few version to reflect that. Released on May 16th 2011

• Added support for ANSI color codes, as listed in man console_codes. Not implemented yet: setting alternate font, setting and resetting mappings, blinking text.
• Added a couple of trivial usage examples in the examples/ dir.