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"""prompt-toolkit utilities
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Everything in this module is a private API,
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not to be used outside IPython.
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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 unicodedata
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from wcwidth import wcwidth
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from IPython.core.completer import (
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provisionalcompleter, cursor_to_position,
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_deduplicate_completions)
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from prompt_toolkit.completion import Completer, Completion
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from prompt_toolkit.lexers import Lexer
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from prompt_toolkit.lexers import PygmentsLexer
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from prompt_toolkit.patch_stdout import patch_stdout
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import pygments.lexers as pygments_lexers
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import os
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import sys
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import traceback
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_completion_sentinel = object()
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def _elide_point(string:str, *, min_elide=30)->str:
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"""
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If a string is long enough, and has at least 3 dots,
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replace the middle part with ellipses.
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If a string naming a file is long enough, and has at least 3 slashes,
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replace the middle part with ellipses.
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If three consecutive dots, or two consecutive dots are encountered these are
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replaced by the equivalents HORIZONTAL ELLIPSIS or TWO DOT LEADER unicode
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equivalents
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"""
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string = string.replace('...','\N{HORIZONTAL ELLIPSIS}')
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string = string.replace('..','\N{TWO DOT LEADER}')
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if len(string) < min_elide:
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return string
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object_parts = string.split('.')
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file_parts = string.split(os.sep)
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if file_parts[-1] == '':
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file_parts.pop()
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if len(object_parts) > 3:
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return '{}.{}\N{HORIZONTAL ELLIPSIS}{}.{}'.format(object_parts[0], object_parts[1][0], object_parts[-2][-1], object_parts[-1])
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elif len(file_parts) > 3:
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return ('{}' + os.sep + '{}\N{HORIZONTAL ELLIPSIS}{}' + os.sep + '{}').format(file_parts[0], file_parts[1][0], file_parts[-2][-1], file_parts[-1])
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return string
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def _elide_typed(string:str, typed:str, *, min_elide:int=30)->str:
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"""
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Elide the middle of a long string if the beginning has already been typed.
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"""
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if len(string) < min_elide:
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return string
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cut_how_much = len(typed)-3
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if cut_how_much < 7:
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return string
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if string.startswith(typed) and len(string)> len(typed):
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return f"{string[:3]}\N{HORIZONTAL ELLIPSIS}{string[cut_how_much:]}"
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return string
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def _elide(string:str, typed:str, min_elide=30)->str:
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return _elide_typed(
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_elide_point(string, min_elide=min_elide),
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typed, min_elide=min_elide)
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def _adjust_completion_text_based_on_context(text, body, offset):
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if text.endswith('=') and len(body) > offset and body[offset] == '=':
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return text[:-1]
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else:
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return text
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class IPythonPTCompleter(Completer):
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"""Adaptor to provide IPython completions to prompt_toolkit"""
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def __init__(self, ipy_completer=None, shell=None):
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if shell is None and ipy_completer is None:
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raise TypeError("Please pass shell=an InteractiveShell instance.")
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self._ipy_completer = ipy_completer
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self.shell = shell
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@property
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def ipy_completer(self):
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if self._ipy_completer:
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return self._ipy_completer
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else:
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return self.shell.Completer
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def get_completions(self, document, complete_event):
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if not document.current_line.strip():
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return
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# Some bits of our completion system may print stuff (e.g. if a module
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# is imported). This context manager ensures that doesn't interfere with
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# the prompt.
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with patch_stdout(), provisionalcompleter():
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body = document.text
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cursor_row = document.cursor_position_row
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cursor_col = document.cursor_position_col
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cursor_position = document.cursor_position
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offset = cursor_to_position(body, cursor_row, cursor_col)
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try:
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yield from self._get_completions(body, offset, cursor_position, self.ipy_completer)
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except Exception as e:
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try:
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exc_type, exc_value, exc_tb = sys.exc_info()
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traceback.print_exception(exc_type, exc_value, exc_tb)
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except AttributeError:
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print('Unrecoverable Error in completions')
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@staticmethod
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def _get_completions(body, offset, cursor_position, ipyc):
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"""
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Private equivalent of get_completions() use only for unit_testing.
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"""
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debug = getattr(ipyc, 'debug', False)
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completions = _deduplicate_completions(
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body, ipyc.completions(body, offset))
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for c in completions:
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if not c.text:
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# Guard against completion machinery giving us an empty string.
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continue
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text = unicodedata.normalize('NFC', c.text)
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# When the first character of the completion has a zero length,
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# then it's probably a decomposed unicode character. E.g. caused by
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# the "\dot" completion. Try to compose again with the previous
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# character.
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if wcwidth(text[0]) == 0:
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if cursor_position + c.start > 0:
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char_before = body[c.start - 1]
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fixed_text = unicodedata.normalize(
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'NFC', char_before + text)
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# Yield the modified completion instead, if this worked.
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if wcwidth(text[0:1]) == 1:
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yield Completion(fixed_text, start_position=c.start - offset - 1)
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continue
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# TODO: Use Jedi to determine meta_text
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# (Jedi currently has a bug that results in incorrect information.)
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# meta_text = ''
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# yield Completion(m, start_position=start_pos,
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# display_meta=meta_text)
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display_text = c.text
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adjusted_text = _adjust_completion_text_based_on_context(c.text, body, offset)
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if c.type == 'function':
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yield Completion(adjusted_text, start_position=c.start - offset, display=_elide(display_text+'()', body[c.start:c.end]), display_meta=c.type+c.signature)
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else:
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yield Completion(adjusted_text, start_position=c.start - offset, display=_elide(display_text, body[c.start:c.end]), display_meta=c.type)
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class IPythonPTLexer(Lexer):
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"""
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Wrapper around PythonLexer and BashLexer.
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"""
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def __init__(self):
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l = pygments_lexers
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self.python_lexer = PygmentsLexer(l.Python3Lexer)
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self.shell_lexer = PygmentsLexer(l.BashLexer)
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self.magic_lexers = {
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'HTML': PygmentsLexer(l.HtmlLexer),
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'html': PygmentsLexer(l.HtmlLexer),
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'javascript': PygmentsLexer(l.JavascriptLexer),
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'js': PygmentsLexer(l.JavascriptLexer),
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'perl': PygmentsLexer(l.PerlLexer),
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'ruby': PygmentsLexer(l.RubyLexer),
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'latex': PygmentsLexer(l.TexLexer),
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}
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def lex_document(self, document):
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text = document.text.lstrip()
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lexer = self.python_lexer
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if text.startswith('!') or text.startswith('%%bash'):
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lexer = self.shell_lexer
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elif text.startswith('%%'):
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for magic, l in self.magic_lexers.items():
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if text.startswith('%%' + magic):
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lexer = l
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break
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return lexer.lex_document(document)
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