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aiorepl.py
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aiorepl.py
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# MIT license; Copyright (c) 2022 Jim Mussared
import micropython
from micropython import const
import re
import sys
import time
import uasyncio as asyncio
# Import statement (needs to be global, and does not return).
_RE_IMPORT = re.compile("^import ([^ ]+)( as ([^ ]+))?")
_RE_FROM_IMPORT = re.compile("^from [^ ]+ import ([^ ]+)( as ([^ ]+))?")
# Global variable assignment.
_RE_GLOBAL = re.compile("^([a-zA-Z0-9_]+) ?=[^=]")
# General assignment expression or import statement (does not return a value).
_RE_ASSIGN = re.compile("[^=]=[^=]")
# Command hist (One reserved slot for the current command).
_HISTORY_LIMIT = const(5 + 1)
CHAR_CTRL_A = const(1)
CHAR_CTRL_B = const(2)
CHAR_CTRL_C = const(3)
CHAR_CTRL_D = const(4)
CHAR_CTRL_E = const(5)
async def execute(code, g, s):
if not code.strip():
return
try:
if "await " in code:
# Execute the code snippet in an async context.
if m := _RE_IMPORT.match(code) or _RE_FROM_IMPORT.match(code):
code = "global {}\n {}".format(m.group(3) or m.group(1), code)
elif m := _RE_GLOBAL.match(code):
code = "global {}\n {}".format(m.group(1), code)
elif not _RE_ASSIGN.search(code):
code = "return {}".format(code)
code = """
import uasyncio as asyncio
async def __code():
{}
__exec_task = asyncio.create_task(__code())
""".format(code)
async def kbd_intr_task(exec_task, s):
while True:
if ord(await s.read(1)) == CHAR_CTRL_C:
exec_task.cancel()
return
l = {"__exec_task": None}
exec(code, g, l)
exec_task = l["__exec_task"]
# Concurrently wait for either Ctrl-C from the stream or task
# completion.
intr_task = asyncio.create_task(kbd_intr_task(exec_task, s))
try:
try:
return await exec_task
except asyncio.CancelledError:
pass
finally:
intr_task.cancel()
try:
await intr_task
except asyncio.CancelledError:
pass
else:
# Excute code snippet directly.
try:
try:
micropython.kbd_intr(3)
try:
return eval(code, g)
except SyntaxError:
# Maybe an assignment, try with exec.
return exec(code, g)
except KeyboardInterrupt:
pass
finally:
micropython.kbd_intr(-1)
except Exception as err:
print("{}: {}".format(type(err).__name__, err))
# REPL task. Invoke this with an optional mutable globals dict.
async def task(g=None, prompt="--> "):
print("Starting asyncio REPL...")
if g is None:
g = __import__("__main__").__dict__
try:
micropython.kbd_intr(-1)
s = asyncio.StreamReader(sys.stdin)
# clear = True
hist = [None] * _HISTORY_LIMIT
hist_i = 0 # Index of most recent entry.
hist_n = 0 # Number of history entries.
c = 0 # ord of most recent character.
t = 0 # timestamp of most recent character.
while True:
hist_b = 0 # How far back in the history are we currently.
sys.stdout.write(prompt)
cmd: str = ""
paste = False
curs = 0 # cursor offset from end of cmd buffer
while True:
b = await s.read(1)
pc = c # save previous character
c = ord(b)
pt = t # save previous time
t = time.ticks_ms()
if c < 0x20 or c > 0x7E:
if c == 0x0A:
# LF
if paste:
sys.stdout.write(b)
cmd += b
continue
# If the previous character was also LF, and was less
# than 20 ms ago, this was likely due to CRLF->LFLF
# conversion, so ignore this linefeed.
if pc == 0x0A and time.ticks_diff(t, pt) < 20:
continue
if curs:
# move cursor to end of the line
sys.stdout.write("\x1B[{}C".format(curs))
curs = 0
sys.stdout.write("\n")
if cmd:
# Push current command.
hist[hist_i] = cmd
# Increase history length if possible, and rotate ring forward.
hist_n = min(_HISTORY_LIMIT - 1, hist_n + 1)
hist_i = (hist_i + 1) % _HISTORY_LIMIT
result = await execute(cmd, g, s)
if result is not None:
sys.stdout.write(repr(result))
sys.stdout.write("\n")
break
elif c == 0x08 or c == 0x7F:
# Backspace.
if cmd:
if curs:
cmd = "".join((cmd[: -curs - 1], cmd[-curs:]))
sys.stdout.write(
"\x08\x1B[K"
) # move cursor back, erase to end of line
sys.stdout.write(cmd[-curs:]) # redraw line
sys.stdout.write("\x1B[{}D".format(curs)) # reset cursor location
else:
cmd = cmd[:-1]
sys.stdout.write("\x08 \x08")
elif c == CHAR_CTRL_A:
await raw_repl(s, g)
break
elif c == CHAR_CTRL_B:
continue
elif c == CHAR_CTRL_C:
if paste:
break
sys.stdout.write("\n")
break
elif c == CHAR_CTRL_D:
if paste:
result = await execute(cmd, g, s)
if result is not None:
sys.stdout.write(repr(result))
sys.stdout.write("\n")
break
sys.stdout.write("\n")
# Shutdown asyncio.
asyncio.new_event_loop()
return
elif c == CHAR_CTRL_E:
sys.stdout.write("paste mode; Ctrl-C to cancel, Ctrl-D to finish\n===\n")
paste = True
elif c == 0x1B:
# Start of escape sequence.
key = await s.read(2)
if key in ("[A", "[B"): # up, down
# Stash the current command.
hist[(hist_i - hist_b) % _HISTORY_LIMIT] = cmd
# Clear current command.
b = "\x08" * len(cmd)
sys.stdout.write(b)
sys.stdout.write(" " * len(cmd))
sys.stdout.write(b)
# Go backwards or forwards in the history.
if key == "[A":
hist_b = min(hist_n, hist_b + 1)
else:
hist_b = max(0, hist_b - 1)
# Update current command.
cmd = hist[(hist_i - hist_b) % _HISTORY_LIMIT]
sys.stdout.write(cmd)
elif key == "[D": # left
if curs < len(cmd) - 1:
curs += 1
sys.stdout.write("\x1B")
sys.stdout.write(key)
elif key == "[C": # right
if curs:
curs -= 1
sys.stdout.write("\x1B")
sys.stdout.write(key)
elif key == "[H": # home
pcurs = curs
curs = len(cmd)
sys.stdout.write("\x1B[{}D".format(curs - pcurs)) # move cursor left
elif key == "[F": # end
pcurs = curs
curs = 0
sys.stdout.write("\x1B[{}C".format(pcurs)) # move cursor right
else:
# sys.stdout.write("\\x")
# sys.stdout.write(hex(c))
pass
else:
if curs:
# inserting into middle of line
cmd = "".join((cmd[:-curs], b, cmd[-curs:]))
sys.stdout.write(cmd[-curs - 1 :]) # redraw line to end
sys.stdout.write("\x1B[{}D".format(curs)) # reset cursor location
else:
sys.stdout.write(b)
cmd += b
finally:
micropython.kbd_intr(3)
async def raw_paste(s, g, window=512):
sys.stdout.write("R\x01") # supported
sys.stdout.write(bytearray([window & 0xFF, window >> 8, 0x01]).decode())
eof = False
idx = 0
buff = bytearray(window)
file = b""
while not eof:
for idx in range(window):
b = await s.read(1)
c = ord(b)
if c == CHAR_CTRL_C or c == CHAR_CTRL_D:
# end of file
sys.stdout.write(chr(CHAR_CTRL_D))
if c == CHAR_CTRL_C:
raise KeyboardInterrupt
file += buff[:idx]
eof = True
break
buff[idx] = c
if not eof:
file += buff
sys.stdout.write("\x01") # indicate window available to host
return file
async def raw_repl(s: asyncio.StreamReader, g: dict):
heading = "raw REPL; CTRL-B to exit\n"
line = ""
sys.stdout.write(heading)
while True:
line = ""
sys.stdout.write(">")
while True:
b = await s.read(1)
c = ord(b)
if c == CHAR_CTRL_A:
rline = line
line = ""
if len(rline) == 2 and ord(rline[0]) == CHAR_CTRL_E:
if rline[1] == "A":
line = await raw_paste(s, g)
break
else:
# reset raw REPL
sys.stdout.write(heading)
sys.stdout.write(">")
continue
elif c == CHAR_CTRL_B:
# exit raw REPL
sys.stdout.write("\n")
return 0
elif c == CHAR_CTRL_C:
# clear line
line = ""
elif c == CHAR_CTRL_D:
# entry finished
# indicate reception of command
sys.stdout.write("OK")
break
else:
# let through any other raw 8-bit value
line += b
if len(line) == 0:
# Normally used to trigger soft-reset but stay in raw mode.
# Fake it for aiorepl / mpremote.
sys.stdout.write("Ignored: soft reboot\n")
sys.stdout.write(heading)
try:
result = exec(line, g)
if result is not None:
sys.stdout.write(repr(result))
sys.stdout.write(chr(CHAR_CTRL_D))
except Exception as ex:
print(line)
sys.stdout.write(chr(CHAR_CTRL_D))
sys.print_exception(ex, sys.stdout)
sys.stdout.write(chr(CHAR_CTRL_D))