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import unicodedata
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from wcwidth import wcwidth
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from IPython.utils.py3compat import PY3
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from prompt_toolkit.completion import Completer, Completion
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from prompt_toolkit.layout.lexers import Lexer
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from prompt_toolkit.layout.lexers import PygmentsLexer
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import pygments.lexers as pygments_lexers
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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):
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self.ipy_completer = ipy_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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used, matches = self.ipy_completer.complete(
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line_buffer=document.current_line,
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cursor_pos=document.cursor_position_col
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)
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start_pos = -len(used)
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for m in matches:
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if not m:
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# Guard against completion machinery giving us an empty string.
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continue
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m = unicodedata.normalize('NFC', m)
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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(m[0]) == 0:
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if document.cursor_position + start_pos > 0:
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char_before = document.text[document.cursor_position + start_pos - 1]
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m = unicodedata.normalize('NFC', char_before + m)
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# Yield the modified completion instead, if this worked.
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if wcwidth(m[0:1]) == 1:
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yield Completion(m, start_position=start_pos - 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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yield Completion(m, start_position=start_pos)
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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 if PY3 else l.PythonLexer)
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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, cli, 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(cli, document)
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