def fetch_more_tokens()

in lib/python2/yaml/scanner.py [0:0]

• 48 lines of code
• 32 McCabe index (conditional complexity)

    def fetch_more_tokens(self):

        # Eat whitespaces and comments until we reach the next token.
        self.scan_to_next_token()

        # Remove obsolete possible simple keys.
        self.stale_possible_simple_keys()

        # Compare the current indentation and column. It may add some tokens
        # and decrease the current indentation level.
        self.unwind_indent(self.column)

        # Peek the next character.
        ch = self.peek()

        # Is it the end of stream?
        if ch == u'\0':
            return self.fetch_stream_end()

        # Is it a directive?
        if ch == u'%' and self.check_directive():
            return self.fetch_directive()

        # Is it the document start?
        if ch == u'-' and self.check_document_start():
            return self.fetch_document_start()

        # Is it the document end?
        if ch == u'.' and self.check_document_end():
            return self.fetch_document_end()

        # TODO: support for BOM within a stream.
        #if ch == u'\uFEFF':
        #    return self.fetch_bom()    <-- issue BOMToken

        # Note: the order of the following checks is NOT significant.

        # Is it the flow sequence start indicator?
        if ch == u'[':
            return self.fetch_flow_sequence_start()

        # Is it the flow mapping start indicator?
        if ch == u'{':
            return self.fetch_flow_mapping_start()

        # Is it the flow sequence end indicator?
        if ch == u']':
            return self.fetch_flow_sequence_end()

        # Is it the flow mapping end indicator?
        if ch == u'}':
            return self.fetch_flow_mapping_end()

        # Is it the flow entry indicator?
        if ch == u',':
            return self.fetch_flow_entry()

        # Is it the block entry indicator?
        if ch == u'-' and self.check_block_entry():
            return self.fetch_block_entry()

        # Is it the key indicator?
        if ch == u'?' and self.check_key():
            return self.fetch_key()

        # Is it the value indicator?
        if ch == u':' and self.check_value():
            return self.fetch_value()

        # Is it an alias?
        if ch == u'*':
            return self.fetch_alias()

        # Is it an anchor?
        if ch == u'&':
            return self.fetch_anchor()

        # Is it a tag?
        if ch == u'!':
            return self.fetch_tag()

        # Is it a literal scalar?
        if ch == u'|' and not self.flow_level:
            return self.fetch_literal()

        # Is it a folded scalar?
        if ch == u'>' and not self.flow_level:
            return self.fetch_folded()

        # Is it a single quoted scalar?
        if ch == u'\'':
            return self.fetch_single()

        # Is it a double quoted scalar?
        if ch == u'\"':
            return self.fetch_double()

        # It must be a plain scalar then.
        if self.check_plain():
            return self.fetch_plain()

        # No? It's an error. Let's produce a nice error message.
        raise ScannerError("while scanning for the next token", None,
                "found character %r that cannot start any token"
                % ch.encode('utf-8'), self.get_mark())