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"""Input handling and transformation machinery.
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The first class in this module, :class:`InputSplitter`, is designed to tell when
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input from a line-oriented frontend is complete and should be executed, and when
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the user should be prompted for another line of code instead. The name 'input
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splitter' is largely for historical reasons.
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A companion, :class:`IPythonInputSplitter`, provides the same functionality but
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with full support for the extended IPython syntax (magics, system calls, etc).
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The code to actually do these transformations is in :mod:`IPython.core.inputtransformer`.
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:class:`IPythonInputSplitter` feeds the raw code to the transformers in order
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and stores the results.
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For more details, see the class docstrings below.
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"""
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# Copyright (c) IPython Development Team.
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# Distributed under the terms of the Modified BSD License.
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import ast
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import codeop
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import re
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import sys
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import warnings
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from IPython.utils.py3compat import cast_unicode
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from IPython.core.inputtransformer import (leading_indent,
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classic_prompt,
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ipy_prompt,
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strip_encoding_cookie,
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cellmagic,
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assemble_logical_lines,
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help_end,
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escaped_commands,
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assign_from_magic,
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assign_from_system,
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assemble_python_lines,
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)
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# These are available in this module for backwards compatibility.
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from IPython.core.inputtransformer import (ESC_SHELL, ESC_SH_CAP, ESC_HELP,
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ESC_HELP2, ESC_MAGIC, ESC_MAGIC2,
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ESC_QUOTE, ESC_QUOTE2, ESC_PAREN, ESC_SEQUENCES)
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#-----------------------------------------------------------------------------
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# Utilities
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#-----------------------------------------------------------------------------
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# FIXME: These are general-purpose utilities that later can be moved to the
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# general ward. Kept here for now because we're being very strict about test
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# coverage with this code, and this lets us ensure that we keep 100% coverage
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# while developing.
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# compiled regexps for autoindent management
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dedent_re = re.compile('|'.join([
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r'^\s+raise(\s.*)?$', # raise statement (+ space + other stuff, maybe)
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r'^\s+raise\([^\)]*\).*$', # wacky raise with immediate open paren
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r'^\s+return(\s.*)?$', # normal return (+ space + other stuff, maybe)
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r'^\s+return\([^\)]*\).*$', # wacky return with immediate open paren
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r'^\s+pass\s*$', # pass (optionally followed by trailing spaces)
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r'^\s+break\s*$', # break (optionally followed by trailing spaces)
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r'^\s+continue\s*$', # continue (optionally followed by trailing spaces)
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]))
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ini_spaces_re = re.compile(r'^([ \t\r\f\v]+)')
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# regexp to match pure comment lines so we don't accidentally insert 'if 1:'
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# before pure comments
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comment_line_re = re.compile('^\s*\#')
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def num_ini_spaces(s):
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"""Return the number of initial spaces in a string.
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Note that tabs are counted as a single space. For now, we do *not* support
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mixing of tabs and spaces in the user's input.
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Parameters
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----------
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s : string
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Returns
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-------
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n : int
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"""
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ini_spaces = ini_spaces_re.match(s)
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if ini_spaces:
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return ini_spaces.end()
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else:
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return 0
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def last_blank(src):
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"""Determine if the input source ends in a blank.
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A blank is either a newline or a line consisting of whitespace.
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Parameters
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----------
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src : string
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A single or multiline string.
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"""
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if not src: return False
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ll = src.splitlines()[-1]
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return (ll == '') or ll.isspace()
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last_two_blanks_re = re.compile(r'\n\s*\n\s*$', re.MULTILINE)
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last_two_blanks_re2 = re.compile(r'.+\n\s*\n\s+$', re.MULTILINE)
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def last_two_blanks(src):
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"""Determine if the input source ends in two blanks.
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A blank is either a newline or a line consisting of whitespace.
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Parameters
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----------
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src : string
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A single or multiline string.
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"""
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if not src: return False
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# The logic here is tricky: I couldn't get a regexp to work and pass all
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# the tests, so I took a different approach: split the source by lines,
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# grab the last two and prepend '###\n' as a stand-in for whatever was in
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# the body before the last two lines. Then, with that structure, it's
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# possible to analyze with two regexps. Not the most elegant solution, but
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# it works. If anyone tries to change this logic, make sure to validate
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# the whole test suite first!
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new_src = '\n'.join(['###\n'] + src.splitlines()[-2:])
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return (bool(last_two_blanks_re.match(new_src)) or
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bool(last_two_blanks_re2.match(new_src)) )
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def remove_comments(src):
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"""Remove all comments from input source.
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Note: comments are NOT recognized inside of strings!
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Parameters
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----------
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src : string
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A single or multiline input string.
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Returns
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-------
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String with all Python comments removed.
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"""
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return re.sub('#.*', '', src)
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def get_input_encoding():
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"""Return the default standard input encoding.
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If sys.stdin has no encoding, 'ascii' is returned."""
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# There are strange environments for which sys.stdin.encoding is None. We
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# ensure that a valid encoding is returned.
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encoding = getattr(sys.stdin, 'encoding', None)
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if encoding is None:
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encoding = 'ascii'
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return encoding
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#-----------------------------------------------------------------------------
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# Classes and functions for normal Python syntax handling
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#-----------------------------------------------------------------------------
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class InputSplitter(object):
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r"""An object that can accumulate lines of Python source before execution.
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This object is designed to be fed python source line-by-line, using
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:meth:`push`. It will return on each push whether the currently pushed
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code could be executed already. In addition, it provides a method called
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:meth:`push_accepts_more` that can be used to query whether more input
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can be pushed into a single interactive block.
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This is a simple example of how an interactive terminal-based client can use
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this tool::
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isp = InputSplitter()
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while isp.push_accepts_more():
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indent = ' '*isp.indent_spaces
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prompt = '>>> ' + indent
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line = indent + raw_input(prompt)
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isp.push(line)
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print 'Input source was:\n', isp.source_reset(),
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"""
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# Number of spaces of indentation computed from input that has been pushed
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# so far. This is the attributes callers should query to get the current
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# indentation level, in order to provide auto-indent facilities.
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indent_spaces = 0
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# String, indicating the default input encoding. It is computed by default
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# at initialization time via get_input_encoding(), but it can be reset by a
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# client with specific knowledge of the encoding.
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encoding = ''
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# String where the current full source input is stored, properly encoded.
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# Reading this attribute is the normal way of querying the currently pushed
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# source code, that has been properly encoded.
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source = ''
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# Code object corresponding to the current source. It is automatically
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# synced to the source, so it can be queried at any time to obtain the code
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# object; it will be None if the source doesn't compile to valid Python.
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code = None
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# Private attributes
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# List with lines of input accumulated so far
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|
_buffer = None
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|
# Command compiler
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|
_compile = None
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|
# Mark when input has changed indentation all the way back to flush-left
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|
|
_full_dedent = False
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|
# Boolean indicating whether the current block is complete
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|
|
_is_complete = None
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|
|
# Boolean indicating whether the current block has an unrecoverable syntax error
|
|
|
_is_invalid = False
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|
|
def __init__(self):
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|
"""Create a new InputSplitter instance.
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|
"""
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|
|
self._buffer = []
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|
self._compile = codeop.CommandCompiler()
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|
self.encoding = get_input_encoding()
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def reset(self):
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"""Reset the input buffer and associated state."""
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|
self.indent_spaces = 0
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self._buffer[:] = []
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self.source = ''
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|
self.code = None
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|
self._is_complete = False
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|
self._is_invalid = False
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|
self._full_dedent = False
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|
|
|
|
def source_reset(self):
|
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|
"""Return the input source and perform a full reset.
|
|
|
"""
|
|
|
out = self.source
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|
self.reset()
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|
|
return out
|
|
|
|
|
|
def check_complete(self, source):
|
|
|
"""Return whether a block of code is ready to execute, or should be continued
|
|
|
|
|
|
This is a non-stateful API, and will reset the state of this InputSplitter.
|
|
|
|
|
|
Parameters
|
|
|
----------
|
|
|
source : string
|
|
|
Python input code, which can be multiline.
|
|
|
|
|
|
Returns
|
|
|
-------
|
|
|
status : str
|
|
|
One of 'complete', 'incomplete', or 'invalid' if source is not a
|
|
|
prefix of valid code.
|
|
|
indent_spaces : int or None
|
|
|
The number of spaces by which to indent the next line of code. If
|
|
|
status is not 'incomplete', this is None.
|
|
|
"""
|
|
|
self.reset()
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|
|
try:
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|
|
self.push(source)
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|
|
except SyntaxError:
|
|
|
# Transformers in IPythonInputSplitter can raise SyntaxError,
|
|
|
# which push() will not catch.
|
|
|
return 'invalid', None
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|
|
else:
|
|
|
if self._is_invalid:
|
|
|
return 'invalid', None
|
|
|
elif self.push_accepts_more():
|
|
|
return 'incomplete', self.indent_spaces
|
|
|
else:
|
|
|
return 'complete', None
|
|
|
finally:
|
|
|
self.reset()
|
|
|
|
|
|
def push(self, lines):
|
|
|
"""Push one or more lines of input.
|
|
|
|
|
|
This stores the given lines and returns a status code indicating
|
|
|
whether the code forms a complete Python block or not.
|
|
|
|
|
|
Any exceptions generated in compilation are swallowed, but if an
|
|
|
exception was produced, the method returns True.
|
|
|
|
|
|
Parameters
|
|
|
----------
|
|
|
lines : string
|
|
|
One or more lines of Python input.
|
|
|
|
|
|
Returns
|
|
|
-------
|
|
|
is_complete : boolean
|
|
|
True if the current input source (the result of the current input
|
|
|
plus prior inputs) forms a complete Python execution block. Note that
|
|
|
this value is also stored as a private attribute (``_is_complete``), so it
|
|
|
can be queried at any time.
|
|
|
"""
|
|
|
self._store(lines)
|
|
|
source = self.source
|
|
|
|
|
|
# Before calling _compile(), reset the code object to None so that if an
|
|
|
# exception is raised in compilation, we don't mislead by having
|
|
|
# inconsistent code/source attributes.
|
|
|
self.code, self._is_complete = None, None
|
|
|
self._is_invalid = False
|
|
|
|
|
|
# Honor termination lines properly
|
|
|
if source.endswith('\\\n'):
|
|
|
return False
|
|
|
|
|
|
self._update_indent(lines)
|
|
|
try:
|
|
|
with warnings.catch_warnings():
|
|
|
warnings.simplefilter('error', SyntaxWarning)
|
|
|
self.code = self._compile(source, symbol="exec")
|
|
|
# Invalid syntax can produce any of a number of different errors from
|
|
|
# inside the compiler, so we have to catch them all. Syntax errors
|
|
|
# immediately produce a 'ready' block, so the invalid Python can be
|
|
|
# sent to the kernel for evaluation with possible ipython
|
|
|
# special-syntax conversion.
|
|
|
except (SyntaxError, OverflowError, ValueError, TypeError,
|
|
|
MemoryError, SyntaxWarning):
|
|
|
self._is_complete = True
|
|
|
self._is_invalid = True
|
|
|
else:
|
|
|
# Compilation didn't produce any exceptions (though it may not have
|
|
|
# given a complete code object)
|
|
|
self._is_complete = self.code is not None
|
|
|
|
|
|
return self._is_complete
|
|
|
|
|
|
def push_accepts_more(self):
|
|
|
"""Return whether a block of interactive input can accept more input.
|
|
|
|
|
|
This method is meant to be used by line-oriented frontends, who need to
|
|
|
guess whether a block is complete or not based solely on prior and
|
|
|
current input lines. The InputSplitter considers it has a complete
|
|
|
interactive block and will not accept more input when either:
|
|
|
|
|
|
* A SyntaxError is raised
|
|
|
|
|
|
* The code is complete and consists of a single line or a single
|
|
|
non-compound statement
|
|
|
|
|
|
* The code is complete and has a blank line at the end
|
|
|
|
|
|
If the current input produces a syntax error, this method immediately
|
|
|
returns False but does *not* raise the syntax error exception, as
|
|
|
typically clients will want to send invalid syntax to an execution
|
|
|
backend which might convert the invalid syntax into valid Python via
|
|
|
one of the dynamic IPython mechanisms.
|
|
|
"""
|
|
|
|
|
|
# With incomplete input, unconditionally accept more
|
|
|
# A syntax error also sets _is_complete to True - see push()
|
|
|
if not self._is_complete:
|
|
|
#print("Not complete") # debug
|
|
|
return True
|
|
|
|
|
|
# The user can make any (complete) input execute by leaving a blank line
|
|
|
last_line = self.source.splitlines()[-1]
|
|
|
if (not last_line) or last_line.isspace():
|
|
|
#print("Blank line") # debug
|
|
|
return False
|
|
|
|
|
|
# If there's just a single line or AST node, and we're flush left, as is
|
|
|
# the case after a simple statement such as 'a=1', we want to execute it
|
|
|
# straight away.
|
|
|
if self.indent_spaces==0:
|
|
|
if len(self.source.splitlines()) <= 1:
|
|
|
return False
|
|
|
|
|
|
try:
|
|
|
code_ast = ast.parse(u''.join(self._buffer))
|
|
|
except Exception:
|
|
|
#print("Can't parse AST") # debug
|
|
|
return False
|
|
|
else:
|
|
|
if len(code_ast.body) == 1 and \
|
|
|
not hasattr(code_ast.body[0], 'body'):
|
|
|
#print("Simple statement") # debug
|
|
|
return False
|
|
|
|
|
|
# General fallback - accept more code
|
|
|
return True
|
|
|
|
|
|
#------------------------------------------------------------------------
|
|
|
# Private interface
|
|
|
#------------------------------------------------------------------------
|
|
|
|
|
|
def _find_indent(self, line):
|
|
|
"""Compute the new indentation level for a single line.
|
|
|
|
|
|
Parameters
|
|
|
----------
|
|
|
line : str
|
|
|
A single new line of non-whitespace, non-comment Python input.
|
|
|
|
|
|
Returns
|
|
|
-------
|
|
|
indent_spaces : int
|
|
|
New value for the indent level (it may be equal to self.indent_spaces
|
|
|
if indentation doesn't change.
|
|
|
|
|
|
full_dedent : boolean
|
|
|
Whether the new line causes a full flush-left dedent.
|
|
|
"""
|
|
|
indent_spaces = self.indent_spaces
|
|
|
full_dedent = self._full_dedent
|
|
|
|
|
|
inisp = num_ini_spaces(line)
|
|
|
if inisp < indent_spaces:
|
|
|
indent_spaces = inisp
|
|
|
if indent_spaces <= 0:
|
|
|
#print 'Full dedent in text',self.source # dbg
|
|
|
full_dedent = True
|
|
|
|
|
|
if line.rstrip()[-1] == ':':
|
|
|
indent_spaces += 4
|
|
|
elif dedent_re.match(line):
|
|
|
indent_spaces -= 4
|
|
|
if indent_spaces <= 0:
|
|
|
full_dedent = True
|
|
|
|
|
|
# Safety
|
|
|
if indent_spaces < 0:
|
|
|
indent_spaces = 0
|
|
|
#print 'safety' # dbg
|
|
|
|
|
|
return indent_spaces, full_dedent
|
|
|
|
|
|
def _update_indent(self, lines):
|
|
|
for line in remove_comments(lines).splitlines():
|
|
|
if line and not line.isspace():
|
|
|
self.indent_spaces, self._full_dedent = self._find_indent(line)
|
|
|
|
|
|
def _store(self, lines, buffer=None, store='source'):
|
|
|
"""Store one or more lines of input.
|
|
|
|
|
|
If input lines are not newline-terminated, a newline is automatically
|
|
|
appended."""
|
|
|
|
|
|
if buffer is None:
|
|
|
buffer = self._buffer
|
|
|
|
|
|
if lines.endswith('\n'):
|
|
|
buffer.append(lines)
|
|
|
else:
|
|
|
buffer.append(lines+'\n')
|
|
|
setattr(self, store, self._set_source(buffer))
|
|
|
|
|
|
def _set_source(self, buffer):
|
|
|
return u''.join(buffer)
|
|
|
|
|
|
|
|
|
class IPythonInputSplitter(InputSplitter):
|
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"""An input splitter that recognizes all of IPython's special syntax."""
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# String with raw, untransformed input.
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source_raw = ''
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# Flag to track when a transformer has stored input that it hasn't given
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# back yet.
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transformer_accumulating = False
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# Flag to track when assemble_python_lines has stored input that it hasn't
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# given back yet.
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within_python_line = False
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# Private attributes
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# List with lines of raw input accumulated so far.
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_buffer_raw = None
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def __init__(self, line_input_checker=True, physical_line_transforms=None,
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logical_line_transforms=None, python_line_transforms=None):
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super(IPythonInputSplitter, self).__init__()
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self._buffer_raw = []
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self._validate = True
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if physical_line_transforms is not None:
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self.physical_line_transforms = physical_line_transforms
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else:
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self.physical_line_transforms = [
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leading_indent(),
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classic_prompt(),
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ipy_prompt(),
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cellmagic(end_on_blank_line=line_input_checker),
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strip_encoding_cookie(),
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]
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self.assemble_logical_lines = assemble_logical_lines()
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if logical_line_transforms is not None:
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self.logical_line_transforms = logical_line_transforms
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else:
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self.logical_line_transforms = [
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help_end(),
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escaped_commands(),
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assign_from_magic(),
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assign_from_system(),
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]
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self.assemble_python_lines = assemble_python_lines()
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if python_line_transforms is not None:
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self.python_line_transforms = python_line_transforms
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else:
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# We don't use any of these at present
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self.python_line_transforms = []
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@property
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def transforms(self):
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"Quick access to all transformers."
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return self.physical_line_transforms + \
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[self.assemble_logical_lines] + self.logical_line_transforms + \
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[self.assemble_python_lines] + self.python_line_transforms
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@property
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def transforms_in_use(self):
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"""Transformers, excluding logical line transformers if we're in a
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Python line."""
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t = self.physical_line_transforms[:]
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if not self.within_python_line:
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t += [self.assemble_logical_lines] + self.logical_line_transforms
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return t + [self.assemble_python_lines] + self.python_line_transforms
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def reset(self):
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"""Reset the input buffer and associated state."""
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super(IPythonInputSplitter, self).reset()
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self._buffer_raw[:] = []
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self.source_raw = ''
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self.transformer_accumulating = False
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self.within_python_line = False
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for t in self.transforms:
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try:
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t.reset()
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except SyntaxError:
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# Nothing that calls reset() expects to handle transformer
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# errors
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pass
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def flush_transformers(self):
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def _flush(transform, outs):
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"""yield transformed lines
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always strings, never None
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transform: the current transform
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outs: an iterable of previously transformed inputs.
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Each may be multiline, which will be passed
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one line at a time to transform.
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"""
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for out in outs:
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for line in out.splitlines():
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# push one line at a time
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tmp = transform.push(line)
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if tmp is not None:
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yield tmp
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# reset the transform
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tmp = transform.reset()
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if tmp is not None:
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yield tmp
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out = []
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for t in self.transforms_in_use:
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out = _flush(t, out)
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out = list(out)
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if out:
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self._store('\n'.join(out))
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def raw_reset(self):
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"""Return raw input only and perform a full reset.
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"""
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out = self.source_raw
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self.reset()
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return out
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def source_reset(self):
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try:
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self.flush_transformers()
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return self.source
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finally:
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self.reset()
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def push_accepts_more(self):
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if self.transformer_accumulating:
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return True
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else:
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return super(IPythonInputSplitter, self).push_accepts_more()
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def transform_cell(self, cell):
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"""Process and translate a cell of input.
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"""
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self.reset()
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try:
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self.push(cell)
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self.flush_transformers()
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return self.source
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finally:
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self.reset()
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def push(self, lines):
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"""Push one or more lines of IPython input.
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This stores the given lines and returns a status code indicating
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whether the code forms a complete Python block or not, after processing
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all input lines for special IPython syntax.
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Any exceptions generated in compilation are swallowed, but if an
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exception was produced, the method returns True.
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Parameters
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----------
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lines : string
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One or more lines of Python input.
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Returns
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-------
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is_complete : boolean
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True if the current input source (the result of the current input
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plus prior inputs) forms a complete Python execution block. Note that
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this value is also stored as a private attribute (_is_complete), so it
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can be queried at any time.
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"""
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# We must ensure all input is pure unicode
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lines = cast_unicode(lines, self.encoding)
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# ''.splitlines() --> [], but we need to push the empty line to transformers
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lines_list = lines.splitlines()
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if not lines_list:
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lines_list = ['']
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# Store raw source before applying any transformations to it. Note
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# that this must be done *after* the reset() call that would otherwise
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# flush the buffer.
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self._store(lines, self._buffer_raw, 'source_raw')
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for line in lines_list:
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out = self.push_line(line)
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return out
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def push_line(self, line):
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buf = self._buffer
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def _accumulating(dbg):
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#print(dbg)
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self.transformer_accumulating = True
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return False
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for transformer in self.physical_line_transforms:
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line = transformer.push(line)
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if line is None:
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return _accumulating(transformer)
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if not self.within_python_line:
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line = self.assemble_logical_lines.push(line)
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if line is None:
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return _accumulating('acc logical line')
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for transformer in self.logical_line_transforms:
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line = transformer.push(line)
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if line is None:
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return _accumulating(transformer)
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line = self.assemble_python_lines.push(line)
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if line is None:
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self.within_python_line = True
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return _accumulating('acc python line')
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else:
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self.within_python_line = False
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for transformer in self.python_line_transforms:
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line = transformer.push(line)
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if line is None:
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return _accumulating(transformer)
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#print("transformers clear") #debug
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self.transformer_accumulating = False
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return super(IPythonInputSplitter, self).push(line)
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