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Copy pathpyeval.py
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executable file
·372 lines (289 loc) · 12.1 KB
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#!/usr/bin/env python3
from __future__ import (unicode_literals, absolute_import,
print_function, division)
from functools import lru_cache
from itertools import count, islice
from signal import signal, SIGPIPE, SIG_DFL
signal(SIGPIPE, SIG_DFL)
import argparse
import collections
import collections.abc
import contextlib
import importlib
import inspect
import json
import pydoc
import sys, re, io
import os, site
if 'VIRTUAL_ENV' in os.environ:
# derived from activate_this.py from the virtualenv package
base = os.environ['VIRTUAL_ENV']
os.environ['PATH'] = os.pathsep.join([os.path.join(base, 'bin')] + os.environ['PATH'].split(os.pathsep))
prev_length = len(sys.path)
site.addsitedir(os.path.realpath(site._get_path(base)))
sys.path[:] = sys.path[prev_length:] + sys.path[0:prev_length]
sys.prefix = base
sys.path.insert(0, '')
cache = lambda function: lru_cache(maxsize=128, typed=True)(function)
try:
from pythonpy.__version__ import __version__
except (ImportError, ValueError, SystemError):
__version__ = '0.5.5'
pyversion = sys.version.split(' ')[0]
version_string = f'''Pythonpy {__version__}
Python {pyversion}'''
module_aliases = {
'mp' : 'matplotlib',
'np' : 'numpy',
'pd' : 'pandas',
'tf' : 'tensorflow',
'xa' : 'xarray'
}
ModuleAlias = collections.namedtuple('ModuleAlias', ('shorthand', 'modname'))
IOHandles = collections.namedtuple('IOHandles', ('out', 'err'))
aliases = { re.compile(rf"^{key}") : ModuleAlias(shorthand=key, modname=value) \
for key, value \
in module_aliases.items() }
def iterlen(iterable):
""" iterlen(iterable) → Return the number of items in “iterable.”
This will consume iterables without a “__len__()” method – be careful!
"""
# Stolen from “more-itertools”: http://bit.ly/2LUZqCx
try:
return len(iterable)
except TypeError as exc:
if 'has no len' in str(exc):
counter = count()
collections.deque(zip(iterable, counter), maxlen=0)
return next(counter)
raise
@cache
def import_matches(query, prefix=''):
for raw_module_name in frozenset(
re.findall(
rf"({prefix}[a-zA-Z_][a-zA-Z0-9_]*)\.?", query)):
module_name = raw_module_name
# Only de-alias module names at the top level,
# and at most de-alias once:
if prefix == '':
for rgx, alias in aliases.items():
if rgx.match(module_name):
module_name = rgx.sub(alias.modname, module_name)
break
try:
module = importlib.import_module(module_name)
except (ModuleNotFoundError, ImportError):
pass
else:
globals()[raw_module_name] = module
if module_name != raw_module_name:
globals()[module_name] = module
yield module
yield from import_matches(query, prefix=rf"{module_name}\.")
def lazy_imports(*args):
query = ' '.join(x for x in args if x)
yield from import_matches(query)
def current_list(input):
return current_list.rgx.split(input)
current_list.rgx = re.compile(r'[^a-zA-Z0-9_\.]')
def inspect_source(instance):
try:
return ''.join(inspect.getsourcelines(instance)[0])
except:
return help(instance)
parser = argparse.ArgumentParser(
formatter_class=argparse.RawDescriptionHelpFormatter,
add_help=False)
group = parser.add_argument_group("Options")
parser.add_argument('expression', nargs='?', default='None',
help="e.g. “py '2 ** 32'”")
group.add_argument('-x', dest='lines_of_stdin',
action='store_const',
const=True, default=False,
help='treat each row of stdin as “x”')
group.add_argument('-fx', dest='filter_result',
action='store_const',
const=True, default=False,
help=argparse.SUPPRESS)
group.add_argument('-l', dest='list_of_stdin',
action='store_const',
const=True, default=False,
help='treat list of stdin as “l”')
group.add_argument('--ji', '--json_input',
dest='json_input',
action='store_const',
const=True, default=False,
help=argparse.SUPPRESS)
group.add_argument('--jo', '--json_output',
dest='json_output',
action='store_const',
const=True, default=False,
help=argparse.SUPPRESS)
group.add_argument('--si', '--split_input',
dest='input_delimiter',
help=argparse.SUPPRESS)
group.add_argument('--so', '--split_output',
dest='output_delimiter',
help=argparse.SUPPRESS)
group.add_argument('-p', '--pager',
dest='pager',
action='store_const',
const=True, default=False,
help=argparse.SUPPRESS)
group.add_argument('-c', dest='pre_cmd', help='run code before expression')
group.add_argument('-C', dest='post_cmd', help='run code after expression')
group.add_argument('--i', '--ignore_exceptions',
dest='ignore_exceptions',
action='store_const',
const=True, default=False,
help=argparse.SUPPRESS)
group.add_argument('-v', '--verbose',
dest='verbosity',
action='count', default=0,
help='set the verbosity level (default=0)')
group.add_argument('-V', '--version', action='version',
version=version_string,
help='show the current version and exit')
group.add_argument('-h', '--help', action='help',
help="show this help message and exit")
def exit(*args, **kwargs):
""" Craft and return (without raising!) a SystemExit exception """
exc = SystemExit("\n\t".join(args))
return exc
@contextlib.contextmanager
def redirect(args):
""" Redirect “stdout” and “stderr” at the same time """
out, err = io.StringIO(), io.StringIO()
with contextlib.ExitStack() as ctx:
ctx.enter_context(contextlib.redirect_stdout(out))
ctx.enter_context(contextlib.redirect_stderr(err))
iohandles = IOHandles(out=out, err=err)
try:
yield iohandles
except SystemExit as exc:
raise exit("[ERROR] in cluval execution:", str(exc))
except BaseException as exc:
import traceback
pyheader = 'pythonpy/pyeval.py'
exprheader = 'File "<string>"'
foundexpr = False
lines = traceback.format_exception(*sys.exc_info())
for line in lines:
if pyheader in line:
continue
iohandles.err.write(line)
if not foundexpr and line.lstrip().startswith(exprheader) and not isinstance(exc, SyntaxError):
iohandles.err.write(' {}\n'.format(args.expression))
foundexpr = True
raise exit(iohandles.err.getvalue())
def safe_eval(code, x):
try:
return eval(code)
except:
return None
def pyeval(argv=None):
""" Evaluate a Python expression from a set of CLI arguments. """
args = parser.parse_args(argv or sys.argv[1:])
with redirect(args) as iohandles:
if sum([args.list_of_stdin, args.lines_of_stdin, args.filter_result]) > 1:
raise exit('Pythonpy accepts at most one of [-x, -l] flags\n')
if args.json_input:
def loads(string):
try:
return json.loads(string.rstrip())
except BaseException as exc:
if args.ignore_exceptions:
pass
else:
raise exc
stdin = (loads(x) for x in sys.stdin)
elif args.input_delimiter:
stdin = (re.split(args.input_delimiter, x.rstrip()) for x in sys.stdin)
else:
stdin = (x.rstrip() for x in sys.stdin)
if args.expression:
args.expression = args.expression.replace("`", "'")
if args.expression.endswith('…'):
args.expression = args.expression[:-1]
args.pager = True
if args.expression.startswith('?') or args.expression.endswith('?'):
final_atom = current_list(args.expression.rstrip('?'))[-1]
first_atom = current_list(args.expression.lstrip('?'))[0]
if args.expression.startswith('??'):
args.expression = f"inspect_source({first_atom})"
elif args.expression.endswith('??'):
args.expression = f"inspect_source({final_atom})"
elif args.expression.startswith('?'):
args.expression = f'inspect.getdoc({first_atom})'
else:
args.expression = f'inspect.getdoc({final_atom})'
args.pager = True
if args.lines_of_stdin:
stdin = islice(stdin, 1)
if args.expression.startswith('help('):
args.pager = True
if args.pre_cmd:
args.pre_cmd = args.pre_cmd.replace("`", "'")
if args.post_cmd:
args.post_cmd = args.post_cmd.replace("`", "'")
# DO THE IMPORTS:
modules = tuple(lazy_imports(args.expression,
args.pre_cmd,
args.post_cmd))
# Print a list of any imported modules
if args.verbosity and len(modules):
from pprint import pprint
print("Imported modules:")
pprint(modules)
print()
if args.pre_cmd:
exec(args.pre_cmd)
if args.lines_of_stdin:
if args.ignore_exceptions:
result = (safe_eval(args.expression, x) for x in stdin)
else:
result = (eval(args.expression) for x in stdin)
elif args.filter_result:
if args.ignore_exceptions:
result = (x for x in stdin if safe_eval(args.expression, x))
else:
result = (x for x in stdin if eval(args.expression))
elif args.list_of_stdin:
locals()['l'] = list(stdin)
result = eval(args.expression)
else:
result = eval(args.expression)
def prepare(output):
if output is None:
return None
elif args.json_output:
return json.dumps(output)
elif args.output_delimiter:
return args.output_delimiter.join(output)
else:
return output
if isinstance(result, collections.abc.Iterable) and not \
isinstance(result, (str, bytes)):
for x in result:
formatted = prepare(x)
if formatted is not None:
iohandles.out.write(f"{formatted}\n")
else:
formatted = prepare(result)
if formatted is not None:
iohandles.out.write(f"{formatted}\n")
if args.post_cmd:
exec(args.post_cmd)
sys.stdout.flush()
# Extract rerouted «stdout» value:
out = iohandles.out.getvalue()
# Return extracted «stdout» and whether or not to page:
return out, args.pager
def main():
out, pager = pyeval()
if pager:
pydoc.pager(out)
else:
print(out, end='')
if __name__ == '__main__':
main()
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