IPython/core/tests/test_inputtransformer.py

import unittest
import nose.tools as nt

from IPython.testing import tools as tt
from IPython.utils import py3compat
u_fmt = py3compat.u_format

from IPython.core import inputtransformer as ipt

def transform_and_reset(transformer):
    transformer = transformer()
    def transform(inp):
        try:
            return transformer.push(inp)
        finally:
            transformer.reset()
    
    return transform

# Transformer tests
def transform_checker(tests, transformer):
    """Utility to loop over test inputs"""
    transformer = transformer()
    try:
        for inp, tr in tests:
            if inp is None:
                out = transformer.reset()
            else:
                out = transformer.push(inp)
            nt.assert_equal(out, tr)
    finally:
        transformer.reset()

# Data for all the syntax tests in the form of lists of pairs of
# raw/transformed input.  We store it here as a global dict so that we can use
# it both within single-function tests and also to validate the behavior of the
# larger objects

syntax = \
  dict(assign_system =
       [(i,py3compat.u_format(o)) for i,o in \
       [(u'a =! ls', "a = get_ipython().getoutput({u}'ls')"),
        (u'b = !ls', "b = get_ipython().getoutput({u}'ls')"),
        ('x=1', 'x=1'), # normal input is unmodified
        ('    ','    '),  # blank lines are kept intact
        ]],

       assign_magic =
       [(i,py3compat.u_format(o)) for i,o in \
       [(u'a =% who', "a = get_ipython().magic({u}'who')"),
        (u'b = %who', "b = get_ipython().magic({u}'who')"),
        ('x=1', 'x=1'), # normal input is unmodified
        ('    ','    '),  # blank lines are kept intact
        ]],

       classic_prompt =
       [('>>> x=1', 'x=1'),
        ('x=1', 'x=1'), # normal input is unmodified
        ('    ', '    '),  # blank lines are kept intact
        ],

       ipy_prompt =
       [('In [1]: x=1', 'x=1'),
        ('x=1', 'x=1'), # normal input is unmodified
        ('    ','    '),  # blank lines are kept intact
        ],

       # Tests for the escape transformer to leave normal code alone
       escaped_noesc =
       [ ('    ', '    '),
         ('x=1', 'x=1'),
         ],

       # System calls
       escaped_shell =
       [(i,py3compat.u_format(o)) for i,o in \
       [ (u'!ls', "get_ipython().system({u}'ls')"),
         # Double-escape shell, this means to capture the output of the
         # subprocess and return it
         (u'!!ls', "get_ipython().getoutput({u}'ls')"),
         ]],

       # Help/object info
       escaped_help =
       [(i,py3compat.u_format(o)) for i,o in \
       [ (u'?', 'get_ipython().show_usage()'),
         (u'?x1', "get_ipython().magic({u}'pinfo x1')"),
         (u'??x2', "get_ipython().magic({u}'pinfo2 x2')"),
         (u'?a.*s', "get_ipython().magic({u}'psearch a.*s')"),
         (u'?%hist1', "get_ipython().magic({u}'pinfo %hist1')"),
         (u'?%%hist2', "get_ipython().magic({u}'pinfo %%hist2')"),
         (u'?abc = qwe', "get_ipython().magic({u}'pinfo abc')"),
         ]],

      end_help =
      [(i,py3compat.u_format(o)) for i,o in \
      [ (u'x3?', "get_ipython().magic({u}'pinfo x3')"),
        (u'x4??', "get_ipython().magic({u}'pinfo2 x4')"),
        (u'%hist1?', "get_ipython().magic({u}'pinfo %hist1')"),
        (u'%hist2??', "get_ipython().magic({u}'pinfo2 %hist2')"),
        (u'%%hist3?', "get_ipython().magic({u}'pinfo %%hist3')"),
        (u'%%hist4??', "get_ipython().magic({u}'pinfo2 %%hist4')"),
        (u'f*?', "get_ipython().magic({u}'psearch f*')"),
        (u'ax.*aspe*?', "get_ipython().magic({u}'psearch ax.*aspe*')"),
        (u'a = abc?', "get_ipython().set_next_input({u}'a = abc');"
                      "get_ipython().magic({u}'pinfo abc')"),
        (u'a = abc.qe??', "get_ipython().set_next_input({u}'a = abc.qe');"
                          "get_ipython().magic({u}'pinfo2 abc.qe')"),
        (u'a = *.items?', "get_ipython().set_next_input({u}'a = *.items');"
                          "get_ipython().magic({u}'psearch *.items')"),
        (u'plot(a?', "get_ipython().set_next_input({u}'plot(a');"
                     "get_ipython().magic({u}'pinfo a')"),
        (u'a*2 #comment?', 'a*2 #comment?'),
        ]],

       # Explicit magic calls
       escaped_magic =
       [(i,py3compat.u_format(o)) for i,o in \
       [ (u'%cd', "get_ipython().magic({u}'cd')"),
         (u'%cd /home', "get_ipython().magic({u}'cd /home')"),
         # Backslashes need to be escaped.
         (u'%cd C:\\User', "get_ipython().magic({u}'cd C:\\\\User')"),
         (u'    %magic', "    get_ipython().magic({u}'magic')"),
         ]],

       # Quoting with separate arguments
       escaped_quote =
       [ (',f', 'f("")'),
         (',f x', 'f("x")'),
         ('  ,f y', '  f("y")'),
         (',f a b', 'f("a", "b")'),
         ],

       # Quoting with single argument
       escaped_quote2 =
       [ (';f', 'f("")'),
         (';f x', 'f("x")'),
         ('  ;f y', '  f("y")'),
         (';f a b', 'f("a b")'),
         ],

       # Simply apply parens
       escaped_paren =
       [ ('/f', 'f()'),
         ('/f x', 'f(x)'),
         ('  /f y', '  f(y)'),
         ('/f a b', 'f(a, b)'),
         ],

       # Check that we transform prompts before other transforms
       mixed =
       [(i,py3compat.u_format(o)) for i,o in \
       [ (u'In [1]: %lsmagic', "get_ipython().magic({u}'lsmagic')"),
         (u'>>> %lsmagic', "get_ipython().magic({u}'lsmagic')"),
         (u'In [2]: !ls', "get_ipython().system({u}'ls')"),
         (u'In [3]: abs?', "get_ipython().magic({u}'pinfo abs')"),
         (u'In [4]: b = %who', "b = get_ipython().magic({u}'who')"),
         ]],
       )

# multiline syntax examples.  Each of these should be a list of lists, with
# each entry itself having pairs of raw/transformed input.  The union (with
# '\n'.join() of the transformed inputs is what the splitter should produce
# when fed the raw lines one at a time via push.
syntax_ml = \
  dict(classic_prompt =
       [ [('>>> for i in range(10):','for i in range(10):'),
          ('...     print i','    print i'),
          ('... ', ''),
          ],
         [('>>> a="""','a="""'),
          ('... 123"""','123"""'),
          ],
         [('a="""','a="""'),
          ('... 123"""','... 123"""'),
          ],
        ],

       ipy_prompt =
       [ [('In [24]: for i in range(10):','for i in range(10):'),
          ('   ....:     print i','    print i'),
          ('   ....: ', ''),
          ],
         [('In [2]: a="""','a="""'),
          ('   ...: 123"""','123"""'),
          ],
         [('a="""','a="""'),
          ('   ...: 123"""','   ...: 123"""'),
          ],
         ],

       multiline_datastructure =
       [ [('>>> a = [1,','a = [1,'),
          ('... 2]','2]'),
         ],
       ],
       
       leading_indent =
       [ [('    print "hi"','print "hi"'),
          ],
         [('  for a in range(5):','for a in range(5):'),
          ('    a*2','  a*2'),
          ],
         [('    a="""','a="""'),
          ('    123"""','123"""'),
           ],
         [('a="""','a="""'),
          ('    123"""','    123"""'),
          ],
       ],
       
       cellmagic =
       [ [(u'%%foo a', None),
          (None, u_fmt("get_ipython().run_cell_magic({u}'foo', {u}'a', {u}'')")),
          ],
         [(u'%%bar 123', None),
          (u'hello', None),
          (u'', u_fmt("get_ipython().run_cell_magic({u}'bar', {u}'123', {u}'hello')")),
          ],
       ],
       
       escaped =
       [ [('%abc def \\', None),
          ('ghi', u_fmt("get_ipython().magic({u}'abc def  ghi')")),
          ],
         [('%abc def \\', None),
          ('ghi\\', None),
          (None, u_fmt("get_ipython().magic({u}'abc def  ghi')")),
          ],
       ],
       
       assign_magic =
       [ [(u'a = %bc de \\', None),
          (u'fg', u_fmt("a = get_ipython().magic({u}'bc de  fg')")),
          ],
         [(u'a = %bc de \\', None),
          (u'fg\\', None),
          (None, u_fmt("a = get_ipython().magic({u}'bc de  fg')")),
          ],
       ],
       
       assign_system =
       [ [(u'a = !bc de \\', None),
          (u'fg', u_fmt("a = get_ipython().getoutput({u}'bc de  fg')")),
          ],
         [(u'a = !bc de \\', None),
          (u'fg\\', None),
          (None, u_fmt("a = get_ipython().getoutput({u}'bc de  fg')")),
          ],
       ],
       )


def test_assign_system():
    tt.check_pairs(transform_and_reset(ipt.assign_from_system), syntax['assign_system'])
    for example in syntax_ml['assign_system']:
        transform_checker(example, ipt.assign_from_system)

def test_assign_magic():
    tt.check_pairs(transform_and_reset(ipt.assign_from_magic), syntax['assign_magic'])
    for example in syntax_ml['assign_magic']:
        transform_checker(example, ipt.assign_from_magic)


def test_classic_prompt():
    tt.check_pairs(transform_and_reset(ipt.classic_prompt), syntax['classic_prompt'])
    for example in syntax_ml['classic_prompt']:
        transform_checker(example, ipt.classic_prompt)
    for example in syntax_ml['multiline_datastructure']:
        transform_checker(example, ipt.classic_prompt)


def test_ipy_prompt():
    tt.check_pairs(transform_and_reset(ipt.ipy_prompt), syntax['ipy_prompt'])
    for example in syntax_ml['ipy_prompt']:
        transform_checker(example, ipt.ipy_prompt)

def test_help_end():
    tt.check_pairs(transform_and_reset(ipt.help_end), syntax['end_help'])

def test_escaped_noesc():
    tt.check_pairs(transform_and_reset(ipt.escaped_transformer), syntax['escaped_noesc'])


def test_escaped_shell():
    tt.check_pairs(transform_and_reset(ipt.escaped_transformer), syntax['escaped_shell'])


def test_escaped_help():
    tt.check_pairs(transform_and_reset(ipt.escaped_transformer), syntax['escaped_help'])


def test_escaped_magic():
    tt.check_pairs(transform_and_reset(ipt.escaped_transformer), syntax['escaped_magic'])


def test_escaped_quote():
    tt.check_pairs(transform_and_reset(ipt.escaped_transformer), syntax['escaped_quote'])


def test_escaped_quote2():
    tt.check_pairs(transform_and_reset(ipt.escaped_transformer), syntax['escaped_quote2'])


def test_escaped_paren():
    tt.check_pairs(transform_and_reset(ipt.escaped_transformer), syntax['escaped_paren'])

def test_escaped_multiline():
    for example in syntax_ml['escaped']:
        transform_checker(example, ipt.escaped_transformer)

def test_cellmagic():
    for example in syntax_ml['cellmagic']:
        transform_checker(example, ipt.cellmagic)

def test_has_comment():
    tests = [('text', False),
             ('text #comment', True),
             ('text #comment\n', True),
             ('#comment', True),
             ('#comment\n', True),
             ('a = "#string"', False),
             ('a = "#string" # comment', True),
             ('a #comment not "string"', True),
             ]
    tt.check_pairs(ipt.has_comment, tests)