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Directory : /lib/python3/dist-packages/pexpect/

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Current File : /lib/python3/dist-packages/pexpect/replwrap.py

"""Generic wrapper for read-eval-print-loops, a.k.a. interactive shells
"""
import os.path
import signal
import sys

import pexpect

PY3 = (sys.version_info[0] >= 3)

if PY3:
    basestring = str

PEXPECT_PROMPT = u'[PEXPECT_PROMPT>'
PEXPECT_CONTINUATION_PROMPT = u'[PEXPECT_PROMPT+'

class REPLWrapper(object):
    """Wrapper for a REPL.

    :param cmd_or_spawn: This can either be an instance of :class:`pexpect.spawn`
      in which a REPL has already been started, or a str command to start a new
      REPL process.
    :param str orig_prompt: The prompt to expect at first.
    :param str prompt_change: A command to change the prompt to something more
      unique. If this is ``None``, the prompt will not be changed. This will
      be formatted with the new and continuation prompts as positional
      parameters, so you can use ``{}`` style formatting to insert them into
      the command.
    :param str new_prompt: The more unique prompt to expect after the change.
    :param str extra_init_cmd: Commands to do extra initialisation, such as
      disabling pagers.
    """
    def __init__(self, cmd_or_spawn, orig_prompt, prompt_change,
                 new_prompt=PEXPECT_PROMPT,
                 continuation_prompt=PEXPECT_CONTINUATION_PROMPT,
                 extra_init_cmd=None):
        if isinstance(cmd_or_spawn, basestring):
            self.child = pexpect.spawn(cmd_or_spawn, echo=False, encoding='utf-8')
        else:
            self.child = cmd_or_spawn
        if self.child.echo:
            # Existing spawn instance has echo enabled, disable it
            # to prevent our input from being repeated to output.
            self.child.setecho(False)
            self.child.waitnoecho()

        if prompt_change is None:
            self.prompt = orig_prompt
        else:
            self.set_prompt(orig_prompt,
                        prompt_change.format(new_prompt, continuation_prompt))
            self.prompt = new_prompt
        self.continuation_prompt = continuation_prompt

        self._expect_prompt()

        if extra_init_cmd is not None:
            self.run_command(extra_init_cmd)

    def set_prompt(self, orig_prompt, prompt_change):
        self.child.expect(orig_prompt)
        self.child.sendline(prompt_change)

    def _expect_prompt(self, timeout=-1):
        return self.child.expect_exact([self.prompt, self.continuation_prompt],
                                       timeout=timeout)

    def run_command(self, command, timeout=-1):
        """Send a command to the REPL, wait for and return output.

        :param str command: The command to send. Trailing newlines are not needed.
          This should be a complete block of input that will trigger execution;
          if a continuation prompt is found after sending input, :exc:`ValueError`
          will be raised.
        :param int timeout: How long to wait for the next prompt. -1 means the
          default from the :class:`pexpect.spawn` object (default 30 seconds).
          None means to wait indefinitely.
        """
        # Split up multiline commands and feed them in bit-by-bit
        cmdlines = command.splitlines()
        # splitlines ignores trailing newlines - add it back in manually
        if command.endswith('\n'):
            cmdlines.append('')
        if not cmdlines:
            raise ValueError("No command was given")

        res = []
        self.child.sendline(cmdlines[0])
        for line in cmdlines[1:]:
            self._expect_prompt(timeout=timeout)
            res.append(self.child.before)
            self.child.sendline(line)

        # Command was fully submitted, now wait for the next prompt
        if self._expect_prompt(timeout=timeout) == 1:
            # We got the continuation prompt - command was incomplete
            self.child.kill(signal.SIGINT)
            self._expect_prompt(timeout=1)
            raise ValueError("Continuation prompt found - input was incomplete:\n"
                             + command)
        return u''.join(res + [self.child.before])

def python(command="python"):
    """Start a Python shell and return a :class:`REPLWrapper` object."""
    return REPLWrapper(command, u">>> ", u"import sys; sys.ps1={0!r}; sys.ps2={1!r}")

def bash(command="bash"):
    """Start a bash shell and return a :class:`REPLWrapper` object."""
    bashrc = os.path.join(os.path.dirname(__file__), 'bashrc.sh')
    child = pexpect.spawn(command, ['--rcfile', bashrc], echo=False,
                          encoding='utf-8')

    # If the user runs 'env', the value of PS1 will be in the output. To avoid
    # replwrap seeing that as the next prompt, we'll embed the marker characters
    # for invisible characters in the prompt; these show up when inspecting the
    # environment variable, but not when bash displays the prompt.
    ps1 = PEXPECT_PROMPT[:5] + u'\\[\\]' + PEXPECT_PROMPT[5:]
    ps2 = PEXPECT_CONTINUATION_PROMPT[:5] + u'\\[\\]' + PEXPECT_CONTINUATION_PROMPT[5:]
    prompt_change = u"PS1='{0}' PS2='{1}' PROMPT_COMMAND=''".format(ps1, ps2)

    return REPLWrapper(child, u'\\$', prompt_change,
                       extra_init_cmd="export PAGER=cat")

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