- syntaxtree.py: transformation_factory decorator for processing table...

- syntaxtree.py: transformation_factory decorator for processing table functions; further type annotations

DHParser/dsl.py

@@ -31,7 +31,7 @@ from DHParser.ebnf import EBNFTransformer, EBNFCompiler, grammar_changed, \
     ScannerFactoryFunc, ParserFactoryFunc, TransformerFactoryFunc, CompilerFactoryFunc
 from DHParser.toolkit import logging, load_if_file, is_python_code, compile_python_object
 from DHParser.parsers import Grammar, Compiler, compile_source, nil_scanner, ScannerFunc
-from DHParser.syntaxtree import Node, TransformerFunc
+from DHParser.syntaxtree import Node, TransformationFunc
 
 
 __all__ = ['GrammarError',
@@ -79,8 +79,8 @@ from DHParser.parsers import Grammar, Compiler, nil_scanner, \\
     nop_filter, counterpart_filter, accumulating_filter, ScannerFunc
 from DHParser.syntaxtree import Node, traverse, remove_enclosing_delimiters, \\
     remove_children_if, reduce_single_child, replace_by_single_child, remove_whitespace, \\
-    no_operation, remove_expendables, remove_tokens, flatten, is_whitespace, is_expendable, \\
-    collapse, map_content, WHITESPACE_PTYPE, TOKEN_PTYPE, TransformerFunc
+    no_transformation, remove_expendables, remove_tokens, flatten, is_whitespace, is_expendable, \\
+    collapse, map_content, WHITESPACE_PTYPE, TOKEN_PTYPE, TransformationFunc
 '''
 
 
@@ -171,7 +171,7 @@ def grammar_instance(grammar_representation) -> Tuple[Grammar, str]:
 def compileDSL(text_or_file: str,
                scanner: ScannerFunc,
                dsl_grammar: Union[str, Grammar],
-               ast_transformation: TransformerFunc,
+               ast_transformation: TransformationFunc,
                compiler: Compiler) -> Any:
     """Compiles a text in a domain specific language (DSL) with an
     EBNF-specified grammar. Returns the compiled text or raises a

DHParser/ebnf.py

@@ -17,7 +17,7 @@ permissions and limitations under the License.
 """
 
 import keyword
-from functools import partial
+
 try:
     import regex as re
 except ImportError:
@@ -30,7 +30,7 @@ from DHParser.parsers import Grammar, mixin_comment, nil_scanner, Forward, RE, N
     ScannerFunc
 from DHParser.syntaxtree import Node, traverse, remove_enclosing_delimiters, reduce_single_child, \
     replace_by_single_child, TOKEN_PTYPE, remove_expendables, remove_tokens, flatten, \
-    forbid, assert_content, WHITESPACE_PTYPE, key_tag_name, TransformerFunc
+    forbid, assert_content, WHITESPACE_PTYPE, key_tag_name, TransformationFunc
 from DHParser.versionnumber import __version__
 
 
@@ -197,10 +197,9 @@ EBNF_transformation_table = {
     "syntax":
         remove_expendables,
     "directive, definition":
-        partial(remove_tokens, tokens={'@', '='}),
+        remove_tokens('@', '='),
     "expression":
-        [replace_by_single_child, flatten,
-         partial(remove_tokens, tokens={'|'})],
+        [replace_by_single_child, flatten, remove_tokens('|')],
     "term":
         [replace_by_single_child, flatten],  # supports both idioms:  "{ factor }+" and "factor { factor }"
     "factor, flowmarker, retrieveop":
@@ -214,17 +213,17 @@ EBNF_transformation_table = {
     (TOKEN_PTYPE, WHITESPACE_PTYPE):
         [remove_expendables, reduce_single_child],
     "list_":
-        [flatten, partial(remove_tokens, tokens={','})],
+        [flatten, remove_tokens(',')],
     "*":
         [remove_expendables, replace_by_single_child]
 }
 
 
 EBNF_validation_table = {
-    # Semantic validation on the AST
+    # Semantic validation on the AST. EXPERIMENTAL!
     "repetition, option, oneormore":
-        [partial(forbid, child_tags=['repetition', 'option', 'oneormore']),
-         partial(assert_content, regex=r'(?!§)')],
+        [forbid('repetition', 'option', 'oneormore'),
+         assert_content(r'(?!§)')]
 }
 
 
@@ -234,7 +233,7 @@ def EBNFTransformer(syntax_tree: Node):
         traverse(syntax_tree, processing_table, key_func)
 
 
-def get_ebnf_transformer() -> TransformerFunc:
+def get_ebnf_transformer() -> TransformationFunc:
     return EBNFTransformer
 
 
@@ -247,7 +246,7 @@ def get_ebnf_transformer() -> TransformerFunc:
 
 ScannerFactoryFunc = Callable[[], ScannerFunc]
 ParserFactoryFunc = Callable[[], Grammar]
-TransformerFactoryFunc = Callable[[], TransformerFunc]
+TransformerFactoryFunc = Callable[[], TransformationFunc]
 CompilerFactoryFunc = Callable[[], Compiler]
 
 
@@ -270,7 +269,7 @@ def get_grammar() -> {NAME}Grammar:
 
 
 TRANSFORMER_FACTORY = '''
-def get_transformer() -> TransformerFunc:
+def get_transformer() -> TransformationFunc:
     return {NAME}Transform
 '''
 
@@ -349,8 +348,8 @@ class EBNFCompiler(Compiler):
                       '    # AST Transformations for the ' +
                       self.grammar_name + '-grammar']
         for name in self.definition_names:
-            transtable.append('    "' + name + '": no_operation,')
-        transtable += ['    "*": no_operation', '}', '', tf_name +
+            transtable.append('    "' + name + '": no_transformation,')
+        transtable += ['    "*": no_transformation', '}', '', tf_name +
                        ' = partial(traverse, processing_table=%s)' % tt_name, '']
         transtable += [TRANSFORMER_FACTORY.format(NAME=self.grammar_name)]
         return '\n'.join(transtable)

DHParser/parsers.py

@@ -50,8 +50,9 @@ https://bitbucket.org/apalala/grako
 
 
 import copy
-from functools import partial
 import os
+from functools import partial
+
 try:
     import regex as re
 except ImportError:
@@ -60,7 +61,7 @@ from typing import Any, Callable, Dict, Iterator, List, Set, Tuple, Union
 
 from DHParser.toolkit import is_logging, log_dir, logfile_basename, escape_re, sane_parser_name
 from DHParser.syntaxtree import WHITESPACE_PTYPE, TOKEN_PTYPE, ZOMBIE_PARSER, Node, \
-    TransformerFunc
+    TransformationFunc
 from DHParser.toolkit import load_if_file, error_messages
 
 __all__ = ['ScannerFunc',
@@ -224,8 +225,8 @@ class ParserMetaClass(type):
 class Parser(metaclass=ParserMetaClass):
     ApplyFunc = Callable[['Parser'], None]
 
-    def __init__(self, name=''):
-        assert isinstance(name, str), str(name)
+    def __init__(self, name: str = '') -> None:
+        # assert isinstance(name, str), str(name)
         self.name = name  # type: str
         self._grammar = None  # type: 'Grammar'
         self.reset()
@@ -367,7 +368,7 @@ class Grammar:
         self.all_parsers.add(parser)
         parser.grammar = self
 
-    def __call__(self, document, start_parser="root__"):
+    def __call__(self, document: str, start_parser="root__"):
         """Parses a document with with parser-combinators.
 
         Args:
@@ -378,7 +379,7 @@ class Grammar:
         Returns:
             Node: The root node ot the parse tree.
         """
-        assert isinstance(document, str), type(document)
+        # assert isinstance(document, str), type(document)
         if self.root__ is None:
             raise NotImplementedError()
         if self.dirty_flag:
@@ -390,7 +391,7 @@ class Grammar:
         self.history_tracking = is_logging()
         self.document = document
         parser = self[start_parser]
-        stitches = []
+        stitches = []  # type: List[Node]
         rest = document
         if not rest:
             result, ignore = parser(rest)
@@ -495,7 +496,7 @@ BEGIN_SCANNER_TOKEN = '\x1b'
 END_SCANNER_TOKEN = '\x1c'
 
 
-def make_token(token, argument='') -> str:
+def make_token(token: str, argument: str = '') -> str:
     """Turns the ``token`` and ``argument`` into a special token that
     will be caught by the `ScannerToken`-parser.
 
@@ -509,7 +510,7 @@ def make_token(token, argument='') -> str:
     return BEGIN_SCANNER_TOKEN + token + argument + END_SCANNER_TOKEN
 
 
-def nil_scanner(text) -> str:
+def nil_scanner(text: str) -> str:
     return text
 
 
@@ -524,9 +525,9 @@ class ScannerToken(Parser):
     indented block. Otherwise indented block are difficult to handle 
     with parsing expression grammars.
     """
-    def __init__(self, scanner_token):
-        assert isinstance(scanner_token, str) and scanner_token and \
-               scanner_token.isupper()
+
+    def __init__(self, scanner_token: str) -> None:
+        assert scanner_token and scanner_token.isupper()
         assert RX_SCANNER_TOKEN.match(scanner_token)
         super(ScannerToken, self).__init__(scanner_token)
 
@@ -565,7 +566,8 @@ class RegExp(Parser):
     other parsers delegate part of the parsing job to other parsers,
     but do not match text directly.
     """
-    def __init__(self, regexp, name=''):
+
+    def __init__(self, regexp, name: str = '') -> None:
         super(RegExp, self).__init__(name)
         self.regexp = re.compile(regexp) if isinstance(regexp, str) else regexp
 
@@ -673,7 +675,7 @@ class RE(Parser):
 class Token(RE):
     assert TOKEN_PTYPE == ":Token"
 
-    def __init__(self, token, wL=None, wR=None, name=''):
+    def __init__(self, token: str, wL=None, wR=None, name: str = '') -> None:
         self.token = token
         super(Token, self).__init__(escape_re(token), wL, wR, name)
 
@@ -681,7 +683,7 @@ class Token(RE):
         return self.__class__(self.token, self.wL, self.wR, self.name)
 
 
-def mixin_comment(whitespace, comment):
+def mixin_comment(whitespace: str, comment: str) -> str:
     """Returns a regular expression that merges comment and whitespace
     regexps. Thus comments cann occur whereever whitespace is allowed
     and will be skipped just as implicit whitespace.
@@ -702,9 +704,9 @@ def mixin_comment(whitespace, comment):
 
 
 class UnaryOperator(Parser):
-    def __init__(self, parser, name=''):
+    def __init__(self, parser: Parser, name: str = '') -> None:
         super(UnaryOperator, self).__init__(name)
-        assert isinstance(parser, Parser)
+        # assert isinstance(parser, Parser)
         self.parser = parser  # type: Parser
 
     def __deepcopy__(self, memo):
@@ -717,10 +719,10 @@ class UnaryOperator(Parser):
 
 
 class NaryOperator(Parser):
-    def __init__(self, *parsers, name=''):
+    def __init__(self, *parsers: Parser, name: str = '') -> None:
         super(NaryOperator, self).__init__(name)
-        assert all([isinstance(parser, Parser) for parser in parsers]), str(parsers)
-        self.parsers = parsers  # type: List[Parser]
+        # assert all([isinstance(parser, Parser) for parser in parsers]), str(parsers)
+        self.parsers = parsers  # type: Collection  ## [Parser]
 
     def __deepcopy__(self, memo):
         parsers = copy.deepcopy(self.parsers, memo)
@@ -733,9 +735,9 @@ class NaryOperator(Parser):
 
 
 class Optional(UnaryOperator):
-    def __init__(self, parser, name=''):
+    def __init__(self, parser: Parser, name: str = '') -> None:
         super(Optional, self).__init__(parser, name)
-        assert isinstance(parser, Parser)
+        # assert isinstance(parser, Parser)
         assert not isinstance(parser, Optional), \
             "Nesting options would be redundant: %s(%s)" % \
             (str(name), str(parser.name))
@@ -766,7 +768,7 @@ class ZeroOrMore(Optional):
 
 
 class OneOrMore(UnaryOperator):
-    def __init__(self, parser, name=''):
+    def __init__(self, parser: Parser, name: str = '') -> None:
         super(OneOrMore, self).__init__(parser, name)
         assert not isinstance(parser, Optional), \
             "Use ZeroOrMore instead of nesting OneOrMore and Optional: " \
@@ -790,7 +792,7 @@ class OneOrMore(UnaryOperator):
 
 
 class Sequence(NaryOperator):
-    def __init__(self, *parsers, name=''):
+    def __init__(self, *parsers: Parser, name: str = '') -> None:
         super(Sequence, self).__init__(*parsers, name=name)
         assert len(self.parsers) >= 1
 
@@ -808,10 +810,10 @@ class Sequence(NaryOperator):
         assert len(results) <= len(self.parsers)
         return Node(self, results), text_
 
-    def __add__(self, other):
+    def __add__(self, other: 'Sequence') -> 'Sequence':
         return Sequence(*self.parsers, other)
 
-    def __radd__(self, other):
+    def __radd__(self, other: 'Sequence') -> 'Sequence':
         return Sequence(other, *self.parsers)
 
         # def __iadd__(self, other):
@@ -835,7 +837,8 @@ class Alternative(NaryOperator):
     # the most selective expression should be put first:
 
     """
-    def __init__(self, *parsers, name=''):
+
+    def __init__(self, *parsers: Parser, name: str = '') -> None:
         super(Alternative, self).__init__(*parsers, name=name)
         assert len(self.parsers) >= 1
         assert all(not isinstance(p, Optional) for p in self.parsers)
@@ -869,7 +872,7 @@ class Alternative(NaryOperator):
 
 
 class FlowOperator(UnaryOperator):
-    def __init__(self, parser, name=''):
+    def __init__(self, parser: Parser, name: str = '') -> None:
         super(FlowOperator, self).__init__(parser, name)
 
 
@@ -889,7 +892,7 @@ class Required(FlowOperator):
 
 
 class Lookahead(FlowOperator):
-    def __init__(self, parser, name=''):
+    def __init__(self, parser: Parser, name: str = '') -> None:
         super(Lookahead, self).__init__(parser, name)
 
     def __call__(self, text: str) -> Tuple[Node, str]:
@@ -921,7 +924,7 @@ def iter_right_branch(node) -> Iterator[Node]:
 
 
 class Lookbehind(FlowOperator):
-    def __init__(self, parser, name=''):
+    def __init__(self, parser: Parser, name: str = '') -> None:
         super(Lookbehind, self).__init__(parser, name)
         print("WARNING: Lookbehind Operator is experimental!")
 
@@ -961,7 +964,7 @@ class NegativeLookbehind(Lookbehind):
 
 
 class Capture(UnaryOperator):
-    def __init__(self, parser, name=''):
+    def __init__(self, parser: Parser, name: str = '') -> None:
         super(Capture, self).__init__(parser, name)
 
     def __call__(self, text: str) -> Tuple[Node, str]:
@@ -987,8 +990,11 @@ def accumulating_filter(stack):
     return "".join(stack)
 
 
+RetrFilter = Callable[[List[str]], str]
+
+
 class Retrieve(Parser):
-    def __init__(self, symbol, retrieve_filter=None, name=''):
+    def __init__(self, symbol: Parser, retrieve_filter: RetrFilter = None, name: str = '') -> None:
         if not name:
             name = symbol.name
         super(Retrieve, self).__init__(name)
@@ -1135,7 +1141,7 @@ class Compiler:
 def compile_source(source: str,
                    scanner: ScannerFunc,  # str -> str
                    parser: Grammar,  # str -> Node (concrete syntax tree (CST))
-                   transformer: TransformerFunc,  # Node -> Node (abstract syntax tree (AST))
+                   transformer: TransformationFunc,  # Node -> Node (abstract syntax tree (AST))
                    compiler: Compiler):         # Node (AST) -> Any
     """Compiles a source in four stages:
         1. Scanning (if needed)

DHParser/syntaxtree.py

@@ -18,14 +18,16 @@ permissions and limitations under the License.
 """
 
 import copy
+import inspect
 import itertools
 import os
-from functools import partial
+from functools import partial, singledispatch
 try:
     import regex as re
 except ImportError:
     import re
-from typing import Any, Callable, cast, Iterator, NamedTuple, Union, Tuple, List
+from typing import AbstractSet, Any, ByteString, Callable, cast, Container, Iterator, List, \
+    NamedTuple, Sequence, Union, Text, Tuple
 
 from DHParser.toolkit import log_dir, expand_table, line_col, smart_list
 
@@ -35,11 +37,11 @@ __all__ = ['WHITESPACE_PTYPE',
            'ZOMBIE_PARSER',
            'Error',
            'Node',
-           'TransformerFunc',
+           'TransformationFunc',
            'key_parser_name',
            'key_tag_name',
            'traverse',
-           'no_operation',
+           'no_transformation',
            'replace_by_single_child',
            'reduce_single_child',
            'replace_parser',
@@ -445,7 +447,74 @@ class Node:
 ########################################################################
 
 
-TransformerFunc = Union[Callable[[Node], Any], partial]
+TransformationFunc = Union[Callable[[Node], Any], partial]
+
+
+def transformation_factory(t=None):
+    """Creates factory functions transformer-functions with more than
+    one parameter like ``remove_tokens(node, tokens)``. Decorating this
+    function with ``transformation_factory`` creates a function factory with
+    the same name, but without the ``node`` paramter, e.g.
+    ``remove_tokens(tokens)`` which returns a transformerfunction with
+    only one parameter (i.e. ``node``), which can be used in processing
+    dictionaries, thus avoiding explicit lamba- or partial-functions
+    in the table.
+
+    Additionally it converts a list of parameters into a
+    collection, if the decorated function has exaclty two arguments and
+    the second argument is of type Collection.
+
+    Main benefit is reability of processing tables.
+    Example:
+        trans_table = { 'expression': remove_tokens('+', '-') }
+    rather than:
+        trans_table = { 'expression': partial(remove_tokens, tokens={'+', '-'}) }
+
+    Usage:
+        @transformation_factory(AbtractSet[str])
+        def remove_tokens(node, tokens):
+            ...
+    or, alternatively:
+        @transformation_factory
+        def remove_tokens(node, tokens: AbstractSet[str]):
+            ...
+    """
+
+    def decorator(f):
+        sig = inspect.signature(f)
+        params = list(sig.parameters.values())[1:]
+        if len(params) == 0:
+            return f  # '@transformer' not needed w/o free parameters
+        assert t or params[0].annotation != params[0].empty, \
+            "No type information on second parameter found! Please, use type " \
+            "annotation or provide the type information via transfomer-decorator."
+        p1type = t or params[0].annotation
+        f = singledispatch(f)
+        if len(params) == 1 and issubclass(p1type, Container) and not issubclass(p1type, Text) \
+                and not issubclass(p1type, ByteString):
+            def gen_special(*args):
+                c = set(args) if issubclass(p1type, AbstractSet) else \
+                    list(args) if issubclass(p1type, Sequence) else args
+                d = {params[0].name: c}
+                return partial(f, **d)
+
+            f.register(p1type.__args__[0], gen_special)
+
+        def gen_partial(*args, **kwargs):
+            d = {p.name: arg for p, arg in zip(params, args)}
+            d.update(kwargs)
+            return partial(f, **d)
+
+        f.register(p1type, gen_partial)
+        return f
+
+    if isinstance(t, type(lambda: 1)):
+        # assume transformation_factory has been used as decorator w/o parameters
+        func = t;
+        t = None
+        return decorator(func)
+    else:
+        return decorator
 
 
 WHITESPACE_PTYPE = ':Whitespace'
@@ -518,15 +587,7 @@ def traverse(root_node, processing_table, key_func=key_tag_name) -> None:
     traverse_recursive(root_node)
 
 
-# Note on processing functions: If processing functions receive more
-# than one parameter, the ``node``-parameter should always be the
-# last parameter to ease partial function application, e.g.:
-# def replace_parser(name, node):
-#    ...
-# processing_func = partial(replace_parser, "special")
-
-
-def no_operation(node):
+def no_transformation(node):
     pass
 
 
@@ -563,7 +624,8 @@ def reduce_single_child(node):
         node.result = node.result[0].result
 
 
-def replace_parser(node, name):
+@transformation_factory
+def replace_parser(node, name: str):
     """Replaces the parser of a Node with a mock parser with the given
     name.
 
@@ -632,10 +694,11 @@ def is_expendable(node):
     return is_empty(node) or is_whitespace(node)
 
 
-def is_token(node, tokens):
+def is_token(node, tokens: AbstractSet[str] = frozenset()) -> bool:
     return node.parser.ptype == TOKEN_PTYPE and (not tokens or node.result in tokens)
 
 
+@transformation_factory(Callable)  # @singledispatch
 def remove_children_if(node, condition):
     """Removes all nodes from the result field if the function 
     ``condition(child_node)`` evaluates to ``True``."""
@@ -644,11 +707,14 @@ def remove_children_if(node, condition):
 
 
 remove_whitespace = partial(remove_children_if, condition=is_whitespace)
-# remove_scanner_tokens = partial(remove_children_if, condition=is_scanner_token)
 remove_expendables = partial(remove_children_if, condition=is_expendable)
 
 
-def remove_tokens(node, tokens):
+# remove_scanner_tokens = partial(remove_children_if, condition=is_scanner_token)
+
+
+@transformation_factory
+def remove_tokens(node, tokens: AbstractSet[str] = frozenset()):
     """Reomoves any among a particular set of tokens from the immediate
     descendants of a node. If ``tokens`` is the empty set, all tokens
     are removed.
@@ -680,22 +746,26 @@ def map_content(node, func):
 ########################################################################
 
 
-def require(node, child_tags):
+@transformation_factory
+def require(node, child_tags: AbstractSet[str]):
     for child in node.children:
         if child.tag_name not in child_tags:
             node.add_error('Element "%s" is not allowed inside "%s".' %
                            (child.parser.name, node.parser.name))
 
 
-def forbid(node, child_tags):
+@transformation_factory
+def forbid(node, child_tags: AbstractSet[str]):
     for child in node.children:
         if child.tag_name in child_tags:
             node.add_error('Element "%s" cannot be nested inside "%s".' %
                            (child.parser.name, node.parser.name))
 
 
-def assert_content(node, regex):
+@transformation_factory
+def assert_content(node, regex: str):
     content = str(node)
     if not re.match(regex, content):
         node.add_error('Element "%s" violates %s on %s' %
                        (node.parser.name, str(regex), content))
+

OLDSTUFF/ParserCombinators_obsolete.py

@@ -582,7 +582,7 @@ def remove_brackets(node):
 
 
 AST_SYMBOLS = {'replace_by_single_child', 'reduce_single_child',
-               'no_operation', 'remove_children_if',
+               'no_transformation', 'remove_children_if',
                'is_whitespace', 'is_expendable', 'remove_whitespace',
                # 'remove_scanner_tokens', 'is_scanner_token',
                'remove_expendables', 'flatten', 'remove_tokens',
@@ -1608,8 +1608,8 @@ class EBNFCompiler(CompilerBase):
                       '    # AST Transformations for the ' +
                       self.grammar_name + '-grammar']
         for name in self.definition_names:
-            transtable.append('    "' + name + '": no_operation,')
-        transtable += ['    "": no_operation', '}', '']
+            transtable.append('    "' + name + '": no_transformation,')
+        transtable += ['    "": no_transformation', '}', '']
         return '\n'.join(transtable)
 
     def gen_compiler_skeleton(self):

examples/MLW/OLDSTUFF/MLW_compiler.py

@@ -16,7 +16,7 @@ except ImportError:
     import re
 from DHParser.parsers import Grammar, Compiler, Alternative, Required, Token, \
     Optional, OneOrMore, Sequence, RE, ZeroOrMore, NegativeLookahead, mixin_comment, compile_source
-from DHParser.syntaxtree import traverse, reduce_single_child, replace_by_single_child, no_operation, \
+from DHParser.syntaxtree import traverse, reduce_single_child, replace_by_single_child, no_transformation, \
     remove_expendables, remove_tokens, flatten, \
     WHITESPACE_KEYWORD, TOKEN_KEYWORD
 
@@ -220,10 +220,10 @@ def join_strings(node, delimiter='\n'):
 
 MLW_AST_transformation_table = {
     # AST Transformations for the MLW-grammar
-    "Artikel": no_operation,
+    "Artikel": no_transformation,
     "LemmaPosition":
         [partial(remove_tokens, tokens={'LEMMA'})],
-    "Lemma": no_operation,
+    "Lemma": no_transformation,
     "_tll, _wortart, _genus":
         [remove_expendables, reduce_single_child],
     "LemmaVarianten":
@@ -245,32 +245,32 @@ MLW_AST_transformation_table = {
         [remove_expendables, reduce_single_child],
     "Zusatz":
         [remove_expendables, remove_tokens, reduce_single_child],
-    "ArtikelKopf": no_operation,
+    "ArtikelKopf": no_transformation,
     "SchreibweisenPosition":
         [partial(remove_tokens, tokens={'SCHREIBWEISE', ':'}),
          flatten, partial(remove_tokens, tokens={','})],
-    "SWTyp": no_operation,
+    "SWTyp": no_transformation,
     "BedeutungsPosition":
         [flatten, partial(remove_tokens, tokens={'BEDEUTUNG'})],
-    "Bedeutung": no_operation,
-    "Bedeutungskategorie": no_operation,
-    "Interpretamente": no_operation,
+    "Bedeutung": no_transformation,
+    "Bedeutungskategorie": no_transformation,
+    "Interpretamente": no_transformation,
     "LateinischeBedeutung, DeutscheBedeutung":
         [remove_expendables, remove_tokens, reduce_single_child],
     "Belege":
         [flatten, remove_tokens],
     "EinBeleg":
         [flatten, remove_expendables, join_strings, reduce_single_child],