#   Copyright 2000-2010 Michael Hudson-Doyle <micahel@gmail.com>
#                       Armin Rigo
#
#                        All Rights Reserved
#
#
# Permission to use, copy, modify, and distribute this software and
# its documentation for any purpose is hereby granted without fee,
# provided that the above copyright notice appear in all copies and
# that both that copyright notice and this permission notice appear in
# supporting documentation.
#
# THE AUTHOR MICHAEL HUDSON DISCLAIMS ALL WARRANTIES WITH REGARD TO
# THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
# AND FITNESS, IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL,
# INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
# RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF
# CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
# CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

"""This is an alternative to python_reader which tries to emulate
the CPython prompt as closely as possible, with the exception of
allowing multiline input and multiline history entries.
"""

import sys
from pyrepl.readline import multiline_input, _error, _get_reader

def check():     # returns False if there is a problem initializing the state
    try:
        _get_reader()
    except _error:
        return False
    return True

def _strip_final_indent(text):
    # kill spaces and tabs at the end, but only if they follow '\n'.
    # meant to remove the auto-indentation only (although it would of
    # course also remove explicitly-added indentation).
    short = text.rstrip(' \t')
    n = len(short)
    if n > 0 and text[n-1] == '\n':
        return short
    return text

def run_multiline_interactive_console(mainmodule=None, future_flags=0):
    import code
    import __main__
    mainmodule = mainmodule or __main__
    console = code.InteractiveConsole(mainmodule.__dict__, filename='<stdin>')
    if future_flags:
        console.compile.compiler.flags |= future_flags

    def more_lines(unicodetext):
        # ooh, look at the hack:
        if sys.version_info < (3,):
            src = "#coding:utf-8\n"+_strip_final_indent(unicodetext).encode('utf-8')
        else:
            src = _strip_final_indent(unicodetext)
        try:
            code = console.compile(src, '<stdin>', 'single')
        except (OverflowError, SyntaxError, ValueError):
            return False
        else:
            return code is None

    while 1:
        try:
            try:
                sys.stdout.flush()
            except:
                pass
            ps1 = getattr(sys, 'ps1', '>>> ')
            ps2 = getattr(sys, 'ps2', '... ')
            try:
                statement = multiline_input(more_lines, ps1, ps2,
                                            returns_unicode=True)
            except EOFError:
                break
            more = console.push(_strip_final_indent(statement))
            assert not more
        except KeyboardInterrupt:
            console.write("\nKeyboardInterrupt\n")
            console.resetbuffer()
        except MemoryError:
            console.write("\nMemoryError\n")
            console.resetbuffer()