environment/lib/python2.7/site-packages/IPython/frontend/qt/console/completion_lexer.py
def get_context(self, string):
        """ Assuming the cursor is at the end of the specified string, get the
            context (a list of names) for the symbol at cursor position.
        """
        context = []
        reversed_tokens = list(self._lexer.get_tokens(string))
        reversed_tokens.reverse()

        # Pygments often tacks on a newline when none is specified in the input.
        # Remove this newline.
        if reversed_tokens and reversed_tokens[0][1].endswith('\n') and \
                not string.endswith('\n'):
            reversed_tokens.pop(0)

        current_op = ''
        for token, text in reversed_tokens:

            if is_token_subtype(token, Token.Name):

                # Handle a trailing separator, e.g 'foo.bar.'
                if current_op in self._name_separators:
                    if not context:
                        context.insert(0, '')

                # Handle non-separator operators and punction.
                elif current_op:
                    break

                context.insert(0, text)
                current_op = ''

            # Pygments doesn't understand that, e.g., '->' is a single operator
            # in C++. This is why we have to build up an operator from
            # potentially several tokens.
            elif token is Token.Operator or token is Token.Punctuation:
                current_op = text + current_op

            # Break on anything that is not a Operator, Punctuation, or Name.
            else:
                break

        return context
def get_context(self, string):
        """ Assuming the cursor is at the end of the specified string, get the
            context (a list of names) for the symbol at cursor position.
        """
        context = []
        reversed_tokens = list(self._lexer.get_tokens(string))
        reversed_tokens.reverse()

        # Pygments often tacks on a newline when none is specified in the input.
        # Remove this newline.
        if reversed_tokens and reversed_tokens[0][1].endswith('\n') and \
                not string.endswith('\n'):
            reversed_tokens.pop(0)

        current_op = ''
        for token, text in reversed_tokens:

            if is_token_subtype(token, Token.Name):

                # Handle a trailing separator, e.g 'foo.bar.'
                if current_op in self._name_separators:
                    if not context:
                        context.insert(0, '')

                # Handle non-separator operators and punction.
                elif current_op:
                    break

                context.insert(0, text)
                current_op = ''

            # Pygments doesn't understand that, e.g., '->' is a single operator
            # in C++. This is why we have to build up an operator from
            # potentially several tokens.
            elif token is Token.Operator or token is Token.Punctuation:
                current_op = text + current_op

            # Break on anything that is not a Operator, Punctuation, or Name.
            else:
                break

        return context
Assuming the cursor is at the end of the specified string, get the
            context (a list of names) for the symbol at cursor position.