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# this module requires Python 2.5+
from __future__ import with_statement
import os, sys, cmd, shlex, traceback
import plac_core
def cmd_interface(obj):
"Returns a cmd.Cmd wrapper over the command container"
i = Interpreter(obj)
def default(self, line):
print(i.send(line))
dic = dict(preloop=lambda self: i.__enter__(),
postloop=lambda self: i.__exit__(),
do_EOF=lambda self, line: True,
default=default,
intro=getattr(i, 'intro', None))
for command in obj.commands:
method = getattr(obj, command)
def do_func(self, line, command=command):
print(i.send(command + ' ' + line))
do_func.__doc__ = method.__doc__
do_func.__name__ = method.__name__
dic['do_' + command] = do_func
clsname = '_%s_' % obj.__class__.__name__
cls = type(clsname, (cmd.Cmd, object), dic)
return cls()
def _getoutputs(lines, intlist):
"helper used in parse_doctest"
for i, start in enumerate(intlist[:-1]):
end = intlist[i + 1]
yield '\n'.join(lines[start+1:end])
class Output(tuple):
"""
The output returned by the .send method of an Interpreter object.
Contains the output string (or None if there is an exception)
and the exception information (exception type, exception, traceback).
"""
def __new__(cls, outstr, etype, exc, tb):
self = tuple.__new__(cls, (outstr, etype, exc, tb))
self.str = outstr
self.etype = etype
self.exc = exc
self.tb = tb
return self
def __str__(self):
"Returns the output string or the error message"
if self.str is None: # there was an error
return '%s: %s' % (self.etype.__name__, self.exc)
else:
return self.str
class Interpreter(object):
"""
A context manager with a .send method and a few utility methods:
execute, test and doctest.
"""
def __init__(self, obj, commentchar='#'):
self.obj = obj
self.commentchar = commentchar
self.interpreter = None
self.p = plac_core.parser_from(obj)
self.p.error = lambda msg: sys.exit(msg) # patch the parser
def __enter__(self):
self.interpreter = self._make_interpreter()
self.interpreter.send(None)
return self
def send(self, line):
"Send a line to the underlying interpreter and return an Output object"
if self.interpreter is None:
raise RuntimeError('%r not initialized: probably you forgot to '
'use the with statement' % self)
return self.interpreter.send(line)
def close(self):
self.interpreter.close()
def __exit__(self, *exc):
self.close()
def _make_interpreter(self):
enter = getattr(self.obj, '__enter__', lambda : None)
exit = getattr(self.obj, '__exit__', lambda et, ex, tb: None)
enter()
output = None
try:
while True:
line = yield output
arglist = shlex.split(line, self.commentchar)
try:
lines = plac_core.call(self.obj, arglist)
except:
output = Output(None, *sys.exc_info())
else:
if not hasattr(lines, '__iter__'):
raise TypeError('Expected a sequence, got %r' % lines)
s = os.linesep.join(map(str, lines))
output = Output(s, None, None, None)
except GeneratorExit: # regular exit
exit(None, None, None)
except: # exceptional exit
exit(*sys.exc_info())
raise
def check(self, given_input, expected_output, lineno=None):
"Make sure you get the expected_output from the given_input"
output = str(self.send(given_input))
ok = output == expected_output
if not ok:
msg = 'input: %s\noutput: %s\nexpected: %s' % (
given_input, output, expected_output)
if lineno:
msg = 'line %d: %s' % (lineno + 1, msg)
raise AssertionError(msg)
def _parse_doctest(self, lineiter):
lines = [line.strip() for line in lineiter]
inputs = []
positions = []
for i, line in enumerate(lines):
if line.startswith('i> '):
inputs.append(line[3:])
positions.append(i)
positions.append(len(lines) + 1) # last position
return zip(inputs, _getoutputs(lines, positions), positions)
def doctest(self, lineiter, out=sys.stdout, verbose=False):
"""
Parse a text containing doctests in a context and tests of all them.
Raise an error even if a single doctest if broken. Use this for
sequential tests which are logically grouped.
"""
with self:
for input, output, no in self._parse_doctest(lineiter):
if verbose:
out.write('i> %s\n' % input)
out.write('-> %s\n' % output)
out.flush()
self.check(input, output, no)
def execute(self, lineiter, out=sys.stdout, verbose=False):
"""
Execute a lineiter of commands in a context and print the output.
"""
with self:
for line in lineiter:
if verbose:
out.write('i> ' + line); out.flush()
output = self.send(line)
if output.str is None: # there was an error
raise output.etype, output.exc, output.tb
out.write('%s\n' % output.str)
out.flush()
def interact(self, prompt='i> ', verbose=False):
"""Starts an interactive command loop reading commands from the
consolle. Using rlwrap is recommended."""
try:
print(self.obj.intro)
except AttributeError: # no intro
self.p.print_usage()
with self:
while True:
try:
line = raw_input(prompt)
except EOFError:
break
out = self.send(line)
if verbose:
traceback.print_tb(out.tb)
print(out)
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