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"""Support for interactive macros in IPython"""

#*****************************************************************************

# Copyright (C) 2001-2005 Fernando Perez <fperez@colorado.edu>

#

# Distributed under the terms of the BSD License. The full license is in

# the file COPYING, distributed as part of this software.

#*****************************************************************************

import re

from IPython.utils import py3compat

from IPython.utils.encoding import DEFAULT_ENCODING

coding_declaration = re.compile(r"#\s*coding[:=]\s*([-\w.]+)")

class Macro(object):

"""Simple class to store the value of macros as strings.

Macro is just a callable that executes a string of IPython

input when called.

"""

def __init__(self,code):

"""store the macro value, as a single string which can be executed"""

lines = []

enc = None

for line in code.splitlines():

coding_match = coding_declaration.match(line)

if coding_match:

enc = coding_match.group(1)

else:

lines.append(line)

code = "\n".join(lines)

if isinstance(code, bytes):

code = code.decode(enc or DEFAULT_ENCODING)

self.value = code + '\n'

def __str__(self):

return self.value

def __repr__(self):

return 'IPython.macro.Macro(%s)' % repr(self.value)

def __getstate__(self):

""" needed for safe pickling via %store """

return {'value': self.value}

def __add__(self, other):

if isinstance(other, Macro):

return Macro(self.value + other.value)

elif isinstance(other, str):

return Macro(self.value + other)

raise TypeError