# Copyright Jonathan Hartley 2013. BSD 3-Clause license, see LICENSE file. import re import sys import os from .ansi import AnsiFore, AnsiBack, AnsiStyle, Style, BEL from .winterm import WinTerm, WinColor, WinStyle from .win32 import windll, winapi_test winterm = None if windll is not None: winterm = WinTerm() class StreamWrapper(object): ''' Wraps a stream (such as stdout), acting as a transparent proxy for all attribute access apart from method 'write()', which is delegated to our Converter instance. ''' def __init__(self, wrapped, converter): # double-underscore everything to prevent clashes with names of # attributes on the wrapped stream object. self.__wrapped = wrapped self.__convertor = converter def __getattr__(self, name): return getattr(self.__wrapped, name) def __enter__(self, *args, **kwargs): # special method lookup bypasses __getattr__/__getattribute__, see # https://stackoverflow.com/questions/12632894/why-doesnt-getattr-work-with-exit # thus, contextlib magic methods are not proxied via __getattr__ return self.__wrapped.__enter__(*args, **kwargs) def __exit__(self, *args, **kwargs): return self.__wrapped.__exit__(*args, **kwargs) def write(self, text): self.__convertor.write(text) def isatty(self): stream = self.__wrapped if 'PYCHARM_HOSTED' in os.environ: if stream is not None and (stream is sys.__stdout__ or stream is sys.__stderr__): return True try: stream_isatty = stream.isatty except AttributeError: return False else: return stream_isatty() @property def closed(self): stream = self.__wrapped try: return stream.closed except AttributeError: return True class AnsiToWin32(object): ''' Implements a 'write()' method which, on Windows, will strip ANSI character sequences from the text, and if outputting to a tty, will convert them into win32 function calls. ''' ANSI_CSI_RE = re.compile('\001?\033\\[((?:\\d|;)*)([a-zA-Z])\002?') # Control Sequence Introducer ANSI_OSC_RE = re.compile('\001?\033\\]([^\a]*)(\a)\002?') # Operating System Command def __init__(self, wrapped, convert=None, strip=None, autoreset=False): # The wrapped stream (normally sys.stdout or sys.stderr) self.wrapped = wrapped # should we reset colors to defaults after every .write() self.autoreset = autoreset # create the proxy wrapping our output stream self.stream = StreamWrapper(wrapped, self) on_windows = os.name == 'nt' # We test if the WinAPI works, because even if we are on Windows # we may be using a terminal that doesn't support the WinAPI # (e.g. Cygwin Terminal). In this case it's up to the terminal # to support the ANSI codes. conversion_supported = on_windows and winapi_test() # should we strip ANSI sequences from our output? if strip is None: strip = conversion_supported or (not self.stream.closed and not self.stream.isatty()) self.strip = strip # should we should convert ANSI sequences into win32 calls? if convert is None: convert = conversion_supported and not self.stream.closed and self.stream.isatty() self.convert = convert # dict of ansi codes to win32 functions and parameters self.win32_calls = self.get_win32_calls() # are we wrapping stderr? self.on_stderr = self.wrapped is sys.stderr def should_wrap(self): ''' True if this class is actually needed. If false, then the output stream will not be affected, nor will win32 calls be issued, so wrapping stdout is not actually required. This will generally be False on non-Windows platforms, unless optional functionality like autoreset has been requested using kwargs to init() ''' return self.convert or self.strip or self.autoreset def get_win32_calls(self): if self.convert and winterm: return { AnsiStyle.RESET_ALL: (winterm.reset_all, ), AnsiStyle.BRIGHT: (winterm.style, WinStyle.BRIGHT), AnsiStyle.DIM: (winterm.style, WinStyle.NORMAL), AnsiStyle.NORMAL: (winterm.style, WinStyle.NORMAL), AnsiFore.BLACK: (winterm.fore, WinColor.BLACK), AnsiFore.RED: (winterm.fore, WinColor.RED), AnsiFore.GREEN: (winterm.fore, WinColor.GREEN), AnsiFore.YELLOW: (winterm.fore, WinColor.YELLOW), AnsiFore.BLUE: (winterm.fore, WinColor.BLUE), AnsiFore.MAGENTA: (winterm.fore, WinColor.MAGENTA), AnsiFore.CYAN: (winterm.fore, WinColor.CYAN), AnsiFore.WHITE: (winterm.fore, WinColor.GREY), AnsiFore.RESET: (winterm.fore, ), AnsiFore.LIGHTBLACK_EX: (winterm.fore, WinColor.BLACK, True), AnsiFore.LIGHTRED_EX: (winterm.fore, WinColor.RED, True), AnsiFore.LIGHTGREEN_EX: (winterm.fore, WinColor.GREEN, True), AnsiFore.LIGHTYELLOW_EX: (winterm.fore, WinColor.YELLOW, True), AnsiFore.LIGHTBLUE_EX: (winterm.fore, WinColor.BLUE, True), AnsiFore.LIGHTMAGENTA_EX: (winterm.fore, WinColor.MAGENTA, True), AnsiFore.LIGHTCYAN_EX: (winterm.fore, WinColor.CYAN, True), AnsiFore.LIGHTWHITE_EX: (winterm.fore, WinColor.GREY, True), AnsiBack.BLACK: (winterm.back, WinColor.BLACK), AnsiBack.RED: (winterm.back, WinColor.RED), AnsiBack.GREEN: (winterm.back, WinColor.GREEN), AnsiBack.YELLOW: (winterm.back, WinColor.YELLOW), AnsiBack.BLUE: (winterm.back, WinColor.BLUE), AnsiBack.MAGENTA: (winterm.back, WinColor.MAGENTA), AnsiBack.CYAN: (winterm.back, WinColor.CYAN), AnsiBack.WHITE: (winterm.back, WinColor.GREY), AnsiBack.RESET: (winterm.back, ), AnsiBack.LIGHTBLACK_EX: (winterm.back, WinColor.BLACK, True), AnsiBack.LIGHTRED_EX: (winterm.back, WinColor.RED, True), AnsiBack.LIGHTGREEN_EX: (winterm.back, WinColor.GREEN, True), AnsiBack.LIGHTYELLOW_EX: (winterm.back, WinColor.YELLOW, True), AnsiBack.LIGHTBLUE_EX: (winterm.back, WinColor.BLUE, True), AnsiBack.LIGHTMAGENTA_EX: (winterm.back, WinColor.MAGENTA, True), AnsiBack.LIGHTCYAN_EX: (winterm.back, WinColor.CYAN, True), AnsiBack.LIGHTWHITE_EX: (winterm.back, WinColor.GREY, True), } return dict() def write(self, text): if self.strip or self.convert: self.write_and_convert(text) else: self.wrapped.write(text) self.wrapped.flush() if self.autoreset: self.reset_all() def reset_all(self): if self.convert: self.call_win32('m', (0,)) elif not self.strip and not self.stream.closed: self.wrapped.write(Style.RESET_ALL) def write_and_convert(self, text): ''' Write the given text to our wrapped stream, stripping any ANSI sequences from the text, and optionally converting them into win32 calls. ''' cursor = 0 text = self.convert_osc(text) for match in self.ANSI_CSI_RE.finditer(text): start, end = match.span() self.write_plain_text(text, cursor, start) self.convert_ansi(*match.groups()) cursor = end self.write_plain_text(text, cursor, len(text)) def write_plain_text(self, text, start, end): if start < end: self.wrapped.write(text[start:end]) self.wrapped.flush() def convert_ansi(self, paramstring, command): if self.convert: params = self.extract_params(command, paramstring) self.call_win32(command, params) def extract_params(self, command, paramstring): if command in 'Hf': params = tuple(int(p) if len(p) != 0 else 1 for p in paramstring.split(';')) while len(params) < 2: # defaults: params = params + (1,) else: params = tuple(int(p) for p in paramstring.split(';') if len(p) != 0) if len(params) == 0: # defaults: if command in 'JKm': params = (0,) elif command in 'ABCD': params = (1,) return params def call_win32(self, command, params): if command == 'm': for param in params: if param in self.win32_calls: func_args = self.win32_calls[param] func = func_args[0] args = func_args[1:] kwargs = dict(on_stderr=self.on_stderr) func(*args, **kwargs) elif command in 'J': winterm.erase_screen(params[0], on_stderr=self.on_stderr) elif command in 'K': winterm.erase_line(params[0], on_stderr=self.on_stderr) elif command in 'Hf': # cursor position - absolute winterm.set_cursor_position(params, on_stderr=self.on_stderr) elif command in 'ABCD': # cursor position - relative n = params[0] # A - up, B - down, C - forward, D - back x, y = {'A': (0, -n), 'B': (0, n), 'C': (n, 0), 'D': (-n, 0)}[command] winterm.cursor_adjust(x, y, on_stderr=self.on_stderr) def convert_osc(self, text): for match in self.ANSI_OSC_RE.finditer(text): start, end = match.span() text = text[:start] + text[end:] paramstring, command = match.groups() if command == BEL: if paramstring.count(";") == 1: params = paramstring.split(";") # 0 - change title and icon (we will only change title) # 1 - change icon (we don't support this) # 2 - change title if params[0] in '02': winterm.set_title(params[1]) return text