- Mandatory operator finished and tested

DHParser/dsl.py

@@ -409,8 +409,8 @@ def compile_on_disk(source_file: str, compiler_suite="", extension=".xml"):
         A (potentially empty) list of error or warning messages.
     """
     filepath = os.path.normpath(source_file)
-    # with open(source_file, encoding="utf-8") as f:
-    #     source = f.read()
+    with open(source_file, encoding="utf-8") as f:
+        source = f.read()
     rootname = os.path.splitext(filepath)[0]
     compiler_name = os.path.basename(rootname)
     if compiler_suite:
@@ -422,7 +422,7 @@ def compile_on_disk(source_file: str, compiler_suite="", extension=".xml"):
         cfactory = get_ebnf_compiler
     compiler1 = cfactory()
     compiler1.set_grammar_name(compiler_name, source_file)
-    result, messages, ast = compile_source(source_file, sfactory(), pfactory(), tfactory(), compiler1)
+    result, messages, ast = compile_source(source, sfactory(), pfactory(), tfactory(), compiler1)
     if has_errors(messages):
         return messages
 

DHParser/ebnf.py

@@ -30,9 +30,9 @@ except ImportError:
     from .typing34 import Callable, Dict, List, Set, Tuple, Union
 
 from DHParser.toolkit import load_if_file, escape_re, md5, sane_parser_name
-from DHParser.parser import Grammar, mixin_comment, nil_preprocessor, Forward, RE, NegativeLookahead, \
-    Alternative, Series, Option, Required, OneOrMore, ZeroOrMore, Token, Compiler, \
-    PreprocessorFunc
+from DHParser.parser import Grammar, mixin_comment, nil_preprocessor, Forward, RegExp, RE, \
+    NegativeLookahead, Alternative, Series, Option, OneOrMore, ZeroOrMore, Token, \
+    Compiler, PreprocessorFunc
 from DHParser.syntaxtree import Node, TransformationFunc, WHITESPACE_PTYPE, TOKEN_PTYPE
 from DHParser.error import Error
 from DHParser.transform import traverse, remove_brackets, \
@@ -73,6 +73,77 @@ def get_ebnf_preprocessor() -> PreprocessorFunc:
 ########################################################################
 
 
+# class EBNFGrammar(Grammar):
+#     r"""Parser for an EBNF source file, with this grammar:
+#
+#     # EBNF-Grammar in EBNF
+#
+#     @ comment    =  /#.*(?:\n|$)/                    # comments start with '#' and eat all chars up to and including '\n'
+#     @ whitespace =  /\s*/                            # whitespace includes linefeed
+#     @ literalws  =  right                            # trailing whitespace of literals will be ignored tacitly
+#
+#     syntax     =  [~//] { definition | directive } §EOF
+#     definition =  symbol §"=" expression
+#     directive  =  "@" §symbol §"=" ( regexp | literal | list_ )
+#
+#     expression =  term { "|" term }
+#     term       =  { factor }+
+#     factor     =  [flowmarker] [retrieveop] symbol !"="   # negative lookahead to be sure it's not a definition
+#                 | [flowmarker] literal
+#                 | [flowmarker] regexp
+#                 | [flowmarker] group
+#                 | [flowmarker] oneormore
+#                 | repetition
+#                 | option
+#
+#     flowmarker =  "!"  | "&"  | "§" |                # '!' negative lookahead, '&' positive lookahead, '§' required
+#                   "-!" | "-&"                        # '-' negative lookbehind, '-&' positive lookbehind
+#     retrieveop =  "::" | ":"                         # '::' pop, ':' retrieve
+#
+#     group      =  "(" expression §")"
+#     oneormore  =  "{" expression "}+"
+#     repetition =  "{" expression §"}"
+#     option     =  "[" expression §"]"
+#
+#     symbol     =  /(?!\d)\w+/~                       # e.g. expression, factor, parameter_list
+#     literal    =  /"(?:[^"]|\\")*?"/~                # e.g. "(", '+', 'while'
+#                 | /'(?:[^']|\\')*?'/~                # whitespace following literals will be ignored tacitly.
+#     regexp     =  /~?\/(?:[^\/]|(?<=\\)\/)*\/~?/~    # e.g. /\w+/, ~/#.*(?:\n|$)/~
+#                                                      # '~' is a whitespace-marker, if present leading or trailing
+#                                                      # whitespace of a regular expression will be ignored tacitly.
+#     list_      =  /\w+/~ { "," /\w+/~ }              # comma separated list of symbols, e.g. BEGIN_LIST, END_LIST,
+#                                                      # BEGIN_QUOTE, END_QUOTE ; see CommonMark/markdown.py for an exmaple
+#     EOF =  !/./
+#     """
+#     expression = Forward()
+#     source_hash__ = "a410e1727fb7575e98ff8451dbf8f3bd"
+#     parser_initialization__ = "upon instantiation"
+#     COMMENT__ = r'#.*(?:\n|$)'
+#     WSP__ = mixin_comment(whitespace=r'\s*', comment=r'#.*(?:\n|$)')
+#     wspL__ = ''
+#     wspR__ = WSP__
+#     EOF = NegativeLookahead(RE('.', wR=''))
+#     list_ = Series(RE('\\w+'), ZeroOrMore(Series(Token(","), RE('\\w+'))))
+#     regexp = RE(r'~?/(?:\\/|[^/])*?/~?')  # RE('~?/(?:[^/]|(?<=\\\\)/)*/~?')
+#     literal = Alternative(RE('"(?:[^"]|\\\\")*?"'), RE("'(?:[^']|\\\\')*?'"))
+#     symbol = RE('(?!\\d)\\w+')
+#     option = Series(Token("["), expression, Required(Token("]")))
+#     repetition = Series(Token("{"), expression, Required(Token("}")))
+#     oneormore = Series(Token("{"), expression, Token("}+"))
+#     group = Series(Token("("), expression, Required(Token(")")))
+#     retrieveop = Alternative(Token("::"), Token(":"))
+#     flowmarker = Alternative(Token("!"), Token("&"), Token("§"), Token("-!"), Token("-&"))
+#     factor = Alternative(Series(Option(flowmarker), Option(retrieveop), symbol, NegativeLookahead(Token("="))),
+#                          Series(Option(flowmarker), literal), Series(Option(flowmarker), regexp),
+#                          Series(Option(flowmarker), group), Series(Option(flowmarker), oneormore),
+#                          repetition, option)
+#     term = OneOrMore(factor)
+#     expression.set(Series(term, ZeroOrMore(Series(Token("|"), term))))
+#     directive = Series(Token("@"), Required(symbol), Required(Token("=")), Alternative(regexp, literal, list_))
+#     definition = Series(symbol, Required(Token("=")), expression)
+#     syntax = Series(Option(RE('', wR='', wL=WSP__)), ZeroOrMore(Alternative(definition, directive)), Required(EOF))
+#     root__ = syntax
+
 class EBNFGrammar(Grammar):
     r"""Parser for an EBNF source file, with this grammar:
 
@@ -84,10 +155,10 @@ class EBNFGrammar(Grammar):
 
     syntax     =  [~//] { definition | directive } §EOF
     definition =  symbol §"=" expression
-    directive  =  "@" §symbol §"=" ( regexp | literal | list_ )
+    directive  =  "@" §symbol "=" ( regexp | literal | list_ )
 
     expression =  term { "|" term }
-    term       =  { factor }+
+    term       =  { ["§"] factor }+                       # "§" means all following factors mandatory
     factor     =  [flowmarker] [retrieveop] symbol !"="   # negative lookahead to be sure it's not a definition
                 | [flowmarker] literal
                 | [flowmarker] regexp
@@ -96,8 +167,8 @@ class EBNFGrammar(Grammar):
                 | repetition
                 | option
 
-    flowmarker =  "!"  | "&"  | "§" |                # '!' negative lookahead, '&' positive lookahead, '§' required
-                  "-!" | "-&"                        # '-' negative lookbehind, '-&' positive lookbehind
+    flowmarker =  "!"  | "&"                         # '!' negative lookahead, '&' positive lookahead
+                | "-!" | "-&"                        # '-' negative lookbehind, '-&' positive lookbehind
     retrieveop =  "::" | ":"                         # '::' pop, ':' retrieve
 
     group      =  "(" expression §")"
@@ -108,7 +179,7 @@ class EBNFGrammar(Grammar):
     symbol     =  /(?!\d)\w+/~                       # e.g. expression, factor, parameter_list
     literal    =  /"(?:[^"]|\\")*?"/~                # e.g. "(", '+', 'while'
                 | /'(?:[^']|\\')*?'/~                # whitespace following literals will be ignored tacitly.
-    regexp     =  /~?\/(?:[^\/]|(?<=\\)\/)*\/~?/~    # e.g. /\w+/, ~/#.*(?:\n|$)/~
+    regexp     =  /~?\/(?:\\\/|[^\/])*?\/~?/~        # e.g. /\w+/, ~/#.*(?:\n|$)/~
                                                      # '~' is a whitespace-marker, if present leading or trailing
                                                      # whitespace of a regular expression will be ignored tacitly.
     list_      =  /\w+/~ { "," /\w+/~ }              # comma separated list of symbols, e.g. BEGIN_LIST, END_LIST,
@@ -116,32 +187,39 @@ class EBNFGrammar(Grammar):
     EOF =  !/./
     """
     expression = Forward()
-    source_hash__ = "a410e1727fb7575e98ff8451dbf8f3bd"
+    source_hash__ = "a131abc5259738631000cda90d2fc65b"
     parser_initialization__ = "upon instantiation"
     COMMENT__ = r'#.*(?:\n|$)'
-    WSP__ = mixin_comment(whitespace=r'\s*', comment=r'#.*(?:\n|$)')
+    WHITESPACE__ = r'\s*'
+    WSP__ = mixin_comment(whitespace=WHITESPACE__, comment=COMMENT__)
     wspL__ = ''
     wspR__ = WSP__
-    EOF = NegativeLookahead(RE('.', wR=''))
-    list_ = Series(RE('\\w+'), ZeroOrMore(Series(Token(","), RE('\\w+'))))
-    regexp = RE(r'~?/(?:\\/|[^/])*?/~?')  # RE('~?/(?:[^/]|(?<=\\\\)/)*/~?')
+    EOF = NegativeLookahead(RegExp('.'))
+    list_ = Series(RE('\\w+'), ZeroOrMore(Series(Token(","), RE('\\w+'), mandatory=1000)),
+                   mandatory=1000)
+    regexp = RE('~?/(?:\\\\/|[^/])*?/~?')
     literal = Alternative(RE('"(?:[^"]|\\\\")*?"'), RE("'(?:[^']|\\\\')*?'"))
     symbol = RE('(?!\\d)\\w+')
-    option = Series(Token("["), expression, Required(Token("]")))
-    repetition = Series(Token("{"), expression, Required(Token("}")))
-    oneormore = Series(Token("{"), expression, Token("}+"))
-    group = Series(Token("("), expression, Required(Token(")")))
+    option = Series(Token("["), expression, Token("]"), mandatory=2)
+    repetition = Series(Token("{"), expression, Token("}"), mandatory=2)
+    oneormore = Series(Token("{"), expression, Token("}+"), mandatory=1000)
+    group = Series(Token("("), expression, Token(")"), mandatory=2)
     retrieveop = Alternative(Token("::"), Token(":"))
-    flowmarker = Alternative(Token("!"), Token("&"), Token("§"), Token("-!"), Token("-&"))
-    factor = Alternative(Series(Option(flowmarker), Option(retrieveop), symbol, NegativeLookahead(Token("="))),
-                         Series(Option(flowmarker), literal), Series(Option(flowmarker), regexp),
-                         Series(Option(flowmarker), group), Series(Option(flowmarker), oneormore),
-                         repetition, option)
-    term = OneOrMore(factor)
-    expression.set(Series(term, ZeroOrMore(Series(Token("|"), term))))
-    directive = Series(Token("@"), Required(symbol), Required(Token("=")), Alternative(regexp, literal, list_))
-    definition = Series(symbol, Required(Token("=")), expression)
-    syntax = Series(Option(RE('', wR='', wL=WSP__)), ZeroOrMore(Alternative(definition, directive)), Required(EOF))
+    flowmarker = Alternative(Token("!"), Token("&"), Token("-!"), Token("-&"))
+    factor = Alternative(
+        Series(Option(flowmarker), Option(retrieveop), symbol, NegativeLookahead(Token("=")),
+               mandatory=1000), Series(Option(flowmarker), literal, mandatory=1000),
+        Series(Option(flowmarker), regexp, mandatory=1000),
+        Series(Option(flowmarker), group, mandatory=1000),
+        Series(Option(flowmarker), oneormore, mandatory=1000), repetition, option)
+    term = OneOrMore(Series(Option(Token("§")), factor, mandatory=1000))
+    expression.set(
+        Series(term, ZeroOrMore(Series(Token("|"), term, mandatory=1000)), mandatory=1000))
+    directive = Series(Token("@"), symbol, Token("="), Alternative(regexp, literal, list_),
+                       mandatory=1)
+    definition = Series(symbol, Token("="), expression, mandatory=1)
+    syntax = Series(Option(RE('', wR='', wL=WSP__)), ZeroOrMore(Alternative(definition, directive)),
+                    EOF, mandatory=2)
     root__ = syntax
 
 
@@ -583,7 +661,7 @@ class EBNFCompiler(Compiler):
             else:
                 assert nd.parser.name == "directive", nd.as_sxpr()
                 self.compile(nd)
-                node.error_flag = max(node.error_flag, nd.error_flag)
+            node.error_flag = max(node.error_flag, nd.error_flag)
         self.definitions.update(definitions)
 
         return self.assemble_parser(definitions, node)
@@ -715,6 +793,7 @@ class EBNFCompiler(Compiler):
         name for the particular non-terminal.
         """
         arguments = [self.compile(r) for r in node.children] + custom_args
+        node.error_flag = max(node.error_flag, max(t.error_flag for t in node.children))
         return parser_class + '(' + ', '.join(arguments) + ')'
 
 
@@ -731,10 +810,10 @@ class EBNFCompiler(Compiler):
                 mandatory_marker.append(i)
                 if i == 0:
                     nd.add_error('First item of a series should not be mandatory.',
-                                 code=Error.WARNING)
+                                 Error.WARNING)
                 elif len(mandatory_marker) > 1:
                     nd.add_error('One mandatory marker (§) sufficient to declare the '
-                                 'rest of the series as mandatory.', code=Error.WARNING)
+                                 'rest of the series as mandatory.', Error.WARNING)
             else:
                 filtered_children.append(nd)
                 i += 1

DHParser/error.py

@@ -27,8 +27,7 @@ __all__ = ('Error',
            'has_errors',
            'only_errors',
            'linebreaks',
-           'line_col',
-           'error_messages')
+           'line_col')
 
 
 class Error:
@@ -44,14 +43,15 @@ class Error:
 
     MANDATORY_CONTINUATION = 1001
 
-    def __init__(self, message: str, level: int=ERROR, code: Hashable=0):
+    def __init__(self, message: str, level: int = ERROR, code: Hashable = 0,
+                 pos: int = -1, line: int = -1, column: int = -1):
         self.message = message
         assert level >= 0
         self.level = level or Error.ERROR
         self.code = code
-        self.pos = -1
-        self.line = -1
-        self.column = -1
+        self.pos = pos
+        self.line = line
+        self.column = column
 
     def __str__(self):
         prefix = ''
@@ -59,6 +59,10 @@ class Error:
             prefix = "line: %3i, column: %2i, " % (self.line, self.column)
         return prefix + "%s: %s" % (self.level_str, self.message)
 
+    def __repr__(self):
+        return 'Error("%s", %i, %s, %i, %i, %i)' \
+               % (self.message, self.level, repr(self.code), self.pos, self.line, self.column)
+
     @property
     def level_str(self):
         return "Warning" if is_warning(self.level) else "Error"
@@ -124,21 +128,20 @@ def _line_col(lbreaks: List[int], pos: int) -> Tuple[int, int]:
     column = pos - lbreaks[line - 1]
     return line, column
 
-
-def error_messages(source_text, errors) -> List[str]:
-    """Returns the sequence or iterator of error objects as an intertor
-    of error messages with line and column numbers at the beginning.
-
-    Args:
-        source_text (str):  The source text on which the errors occurred.
-            (Needed in order to determine the line and column numbers.)
-        errors (list):  The list of errors as returned by the method
-            ``collect_errors()`` of a Node object
-    Returns:
-        a list that contains all error messages in string form. Each
-        string starts with "line: [Line-No], column: [Column-No]
-    """
-    for err in errors:
-        if err.pos >= 0 and err.line <= 0:
-            err.line, err.column = line_col(source_text, err.pos)
-    return [str(err) for err in sorted(errors, key=lambda err: err.pos)]
+# def error_messages(source_text:str, errors: List[Error]) -> List[str]:
+#     """Adds line, column information for error messages, if the position
+#     is given.
+#
+#     Args:
+#         source_text (str):  The source text on which the errors occurred.
+#             (Needed in order to determine the line and column numbers.)
+#         errors (list):  The list of errors as returned by the method
+#             ``collect_errors()`` of a Node object
+#     Returns:
+#         The same list of error messages, which now contain line and
+#         column numbers.
+#     """
+#     for err in errors:
+#         if err.pos >= 0 and err.line <= 0:
+#             err.line, err.column = line_col(source_text, err.pos)
+#     return errors

DHParser/parser.py

@@ -690,9 +690,9 @@ class Grammar:
             for entry, parser in cdict.items():
                 if isinstance(parser, Parser) and sane_parser_name(entry):
                     if not parser.name:
-                        parser.name = entry
-                    if (isinstance(parser, Forward) and (not parser.parser.name)):
-                        parser.parser.name = entry
+                        parser._name = entry
+                    if (isinstance(parser, Forward) and (not parser.parser._name)):
+                        parser.parser._name = entry
             cls.parser_initialization__ = "done"
 
 
@@ -843,7 +843,7 @@ class Grammar:
                 stitches[-1].add_error(error_msg)
                 if self.history_tracking__:
                     # some parsers may have matched and left history records with nodes != None.
-                    # Because these are not connected to the stiched root node, their pos
+                    # Because these are not connected to the stitched root node, their pos-
                     # properties will not be initialized by setting the root node's pos property
                     # to zero. Therefore, their pos properties need to be initialized here
                     for record in self.history__:
@@ -869,7 +869,7 @@ class Grammar:
             else:
                 result.add_error(error_str)
         result.pos = 0  # calculate all positions
-        result.finalize_errors(self.document__)
+        # result.collect_errors(self.document__)
         return result
 
 
@@ -1426,9 +1426,10 @@ class Series(NaryOperator):
                     text_ = text[i:]
                     node.add_error('%s expected; "%s" found!' % (str(parser), text[:10]),
                                    code=Error.MANDATORY_CONTINUATION)
+                    return node, text_
             results += (node,)
-            if node.error_flag:
-                break
+            # if node.error_flag:
+            #     break
             pos += 1
         assert len(results) <= len(self.parsers)
         return Node(self, results), text_
@@ -1976,14 +1977,14 @@ def compile_source(source: str,
     # likely that error list gets littered with compile error messages
     result = None
     ef = syntax_tree.error_flag
-    messages = syntax_tree.collect_errors(clear_errors=True)
+    messages = syntax_tree.collect_errors(source_text, clear_errors=True)
     if not is_error(ef):
         transformer(syntax_tree)
         ef = max(ef, syntax_tree.error_flag)
-        messages.extend(syntax_tree.collect_errors(clear_errors=True))
+        messages.extend(syntax_tree.collect_errors(source_text, clear_errors=True))
         if is_logging():  syntax_tree.log(log_file_name + '.ast')
         if not is_error(syntax_tree.error_flag):
             result = compiler(syntax_tree)
-        messages.extend(syntax_tree.collect_errors())
+        messages.extend(syntax_tree.collect_errors(source_text))
         syntax_tree.error_flag = max(syntax_tree.error_flag, ef)
     return result, messages, syntax_tree

DHParser/syntaxtree.py

@@ -60,7 +60,7 @@ class ParserBase:
     for instantiation.
     """
     def __init__(self, name=''):  # , pbases=frozenset()):
-        self.name = name  # type: str
+        self._name = name  # type: str
         self._ptype = ':' + self.__class__.__name__  # type: str
 
     def __repr__(self):
@@ -69,6 +69,10 @@ class ParserBase:
     def __str__(self):
         return self.name + (' = ' if self.name else '') + repr(self)
 
+    @property
+    def name(self):
+        return self._name
+
     @property
     def ptype(self) -> str:
         return self._ptype
@@ -94,8 +98,7 @@ class MockParser(ParserBase):
     """
     def __init__(self, name='', ptype=''):  # , pbases=frozenset()):
         assert not ptype or ptype[0] == ':'
-        super(MockParser, self).__init__(name)
-        self.name = name
+        super().__init__(name)
         self._ptype = ptype or ':' + self.__class__.__name__
 
 
@@ -303,44 +306,41 @@ class Node(collections.abc.Sized):
     def errors(self) -> List[Error]:
         return self._errors.copy()
 
-
-    def add_error(self, message: str, level: int= Error.ERROR, code: Hashable=0) -> 'Node':
+    def add_error(self, message: str, level: int = Error.ERROR, code: Hashable = 0) -> 'Node':
         self._errors.append(Error(message, level, code))
         self.error_flag = max(self.error_flag, self._errors[-1].level)
         return self
 
-
-    def _finalize_errors(self, lbreaks: List[int]):
-        if self.error_flag:
-            for err in self._errors:
-                assert err.pos >= 0
-                err.line, err.column = line_col(lbreaks, err.pos)
-            for child in self.children:
-                child._finalize_errors(lbreaks)
-
-
-    def finalize_errors(self, source_text: Union[StringView, str]):
-        """Recursively adds line- and column-numbers to all error objects.
-        """
-        if self.error_flag:
-            lbreaks = linebreaks(source_text)
-            self._finalize_errors(lbreaks)
-
-
-    def collect_errors(self, clear_errors=False) -> List[Error]:
+    def collect_errors(self, document: Union[StringView, str] = '', clear_errors=False) -> List[
+        Error]:
         """
+        Recursively adds line- and column-numbers to all error objects.
         Returns all errors of this node or any child node in the form
         of a set of tuples (position, error_message), where position
         is always relative to this node.
         """
-        errors = self.errors
-        if clear_errors:
-            self._errors = []
-            self.error_flag = 0
-        if self.children:
-            for child in self.children:
-                errors.extend(child.collect_errors(clear_errors))
-        return errors
+        if self.error_flag:
+            lbreaks = linebreaks(document) if document else []
+            return self._collect_errors(lbreaks, clear_errors)
+        else:
+            return []
+
+    def _collect_errors(self, lbreaks: List[int] = [], clear_errors=False) -> List[Error]:
+        if self.error_flag:
+            errors = self.errors
+            if lbreaks:
+                for err in errors:
+                    err.pos = self.pos
+                    err.line, err.column = line_col(lbreaks, err.pos)
+            if clear_errors:
+                self._errors = []
+                self.error_flag = 0
+            if self.children:
+                for child in self.children:
+                    errors.extend(child._collect_errors(lbreaks, clear_errors))
+            return errors
+        else:
+            return []
 
 
     def _tree_repr(self, tab, openF, closeF, dataF=identity, density=0) -> str:
@@ -408,7 +408,7 @@ class Node(collections.abc.Sized):
             s = lB + node.tag_name
             # s += " '(pos %i)" % node.pos
             if src:
-                s += " '(pos %i " % node.pos + " %i %i)" % line_col(src, node.pos)
+                s += " '(pos %i " % node.pos  # + " %i %i)" % line_col(src, node.pos)
             if node.errors:
                 s += " '(err '(%s))" % ' '.join(str(err).replace('"', r'\"')
                                                 for err in node.errors)

DHParser/testing.py

@@ -29,7 +29,7 @@ except ImportError:
 
 from DHParser.toolkit import is_logging, clear_logs
 from DHParser.syntaxtree import mock_syntax_tree, flatten_sxpr
-from DHParser.error import is_error, error_messages
+from DHParser.error import is_error
 
 __all__ = ('unit_from_configfile',
            'unit_from_json',
@@ -78,7 +78,7 @@ def unit_from_json(json_filename):
     for symbol in unit:
         for stage in unit[symbol]:
             if stage not in UNIT_STAGES:
-                raise ValueError('Test stage %s not in: ' % (stage, str(UNIT_STAGES)))
+                raise ValueError('Test stage %s not in: %s' % (stage, str(UNIT_STAGES)))
     return unit
 
 # TODO: add support for yaml, cson, toml
@@ -163,8 +163,8 @@ def grammar_unit(test_unit, parser_factory, transformer_factory, report=True, ve
             if is_error(cst.error_flag):
                 errata.append('Match test "%s" for parser "%s" failed:\n\tExpr.:  %s\n\n\t%s\n\n' %
                               (test_name, parser_name, '\n\t'.join(test_code.split('\n')),
-                               '\n\t'.join(m.replace('\n', '\n\t\t') for m in
-                                           error_messages(test_code, cst.collect_errors()))))
+                               '\n\t'.join(str(m).replace('\n', '\n\t\t') for m in
+                                           cst.collect_errors(test_code))))
                 tests.setdefault('__err__', {})[test_name] = errata[-1]
                 # write parsing-history log only in case of failure!
                 parser.log_parsing_history__("match_%s_%s.log" % (parser_name, test_name))

DHParser/transform.py

@@ -275,11 +275,13 @@ def TRUE_CONDITION(context: List[Node]) -> bool:
 
 def replace_child(node: Node):
     assert len(node.children) == 1
-    if not node.children[0].parser.name:
-        node.children[0].parser.name = node.parser.name
-    node.parser = node.children[0].parser
-    node._errors.extend(node.children[0]._errors)
-    node.result = node.children[0].result
+    child = node.children[0]
+    if not child.parser.name:
+        child.parser = MockParser(node.parser.name, child.parser.ptype)
+        # parser names must not be overwritten, else: child.parser.name = node.parser.name
+    node.parser = child.parser
+    node._errors.extend(child._errors)
+    node.result = child.result
 
 
 def reduce_child(node: Node):

examples/EBNF/EBNF.ebnf

@@ -19,7 +19,7 @@ factor     =  [flowmarker] [retrieveop] symbol !"="   # negative lookahead to be
             | option
 
 flowmarker =  "!"  | "&"                         # '!' negative lookahead, '&' positive lookahead
-              "-!" | "-&"                        # '-' negative lookbehind, '-&' positive lookbehind
+            | "-!" | "-&"                        # '-' negative lookbehind, '-&' positive lookbehind
 retrieveop =  "::" | ":"                         # '::' pop, ':' retrieve
 
 group      =  "(" expression §")"

examples/EBNF/EBNF_old.ebnf

@@ -18,8 +18,8 @@ factor     =  [flowmarker] [retrieveop] symbol !"="   # negative lookahead to be
             | repetition
             | option
 
-flowmarker =  "!"  | "&"  | "§" |                # '!' negative lookahead, '&' positive lookahead, '§' required
-              "-!" | "-&"                        # '-' negative lookbehind, '-&' positive lookbehind
+flowmarker =  "!"  | "&"  | "§"                  # '!' negative lookahead, '&' positive lookahead, '§' required
+            | "-!" | "-&"                        # '-' negative lookbehind, '-&' positive lookbehind
 retrieveop =  "::" | ":"                         # '::' pop, ':' retrieve
 
 group      =  "(" expression §")"

examples/LaTeX/LaTeX.ebnf

 # LaTeX-Grammar for DHParser
 
+# preamble
 @ whitespace = /[ \t]*(?:\n(?![ \t]*\n)[ \t]*)?/    # optional whitespace, including at most one linefeed
 @ comment    = /%.*/
 
-
 ########################################################################
 #
 # outer document structure

examples/LaTeX/LaTeXCompiler.py

@@ -16,7 +16,7 @@ try:
 except ImportError:
     import re
 from DHParser import logging, is_filename, Grammar, Compiler, Lookbehind, Alternative, Pop, \
-    Required, Token, Synonym, \
+    Token, Synonym, \
     Option, NegativeLookbehind, OneOrMore, RegExp, Series, RE, Capture, \
     ZeroOrMore, Forward, NegativeLookahead, mixin_comment, compile_source, \
     PreprocessorFunc, TransformationDict, \
@@ -49,10 +49,10 @@ class LaTeXGrammar(Grammar):
     
     # LaTeX-Grammar for DHParser
     
+    # preamble
     @ whitespace = /[ \t]*(?:\n(?![ \t]*\n)[ \t]*)?/    # optional whitespace, including at most one linefeed
     @ comment    = /%.*/
     
-    
     ########################################################################
     #
     # outer document structure
@@ -228,7 +228,7 @@ class LaTeXGrammar(Grammar):
     paragraph = Forward()
     tabular_config = Forward()
     text_element = Forward()
-    source_hash__ = "37585004123d6b80ecf8f67217b43479"
+    source_hash__ = "6f0e961d68f21a54a6e4b1fb01fe17bf"
     parser_initialization__ = "upon instantiation"
     COMMENT__ = r'%.*'
     WHITESPACE__ = r'[ \t]*(?:\n(?![ \t]*\n)[ \t]*)?'
@@ -238,12 +238,15 @@ class LaTeXGrammar(Grammar):
     EOF = RegExp('(?!.)')
     BACKSLASH = RegExp('[\\\\]')
     LB = RegExp('\\s*?\\n|$')
-    NEW_LINE = Series(RegExp('[ \\t]*'), Option(RegExp(COMMENT__)), RegExp('\\n'))
+    NEW_LINE = Series(RegExp('[ \\t]*'), Option(RegExp(COMMENT__)), RegExp('\\n'), mandatory=1000)
     GAP = RE('[ \\t]*(?:\\n[ \\t]*)+\\n')
     WSPC = OneOrMore(Alternative(RegExp(COMMENT__), RegExp('\\s+')))
-    PARSEP = Series(ZeroOrMore(Series(RegExp(WHITESPACE__), RegExp(COMMENT__))), GAP, Option(WSPC))
-    LFF = Series(NEW_LINE, Option(WSPC))
-    LF = Series(NEW_LINE, ZeroOrMore(Series(RegExp(COMMENT__), RegExp(WHITESPACE__))))
+    PARSEP = Series(ZeroOrMore(Series(RegExp(WHITESPACE__), RegExp(COMMENT__), mandatory=1000)),
+                    GAP, Option(WSPC), mandatory=1000)
+    LFF = Series(NEW_LINE, Option(WSPC), mandatory=1000)
+    LF = Series(NEW_LINE,
+                ZeroOrMore(Series(RegExp(COMMENT__), RegExp(WHITESPACE__), mandatory=1000)),
+                mandatory=1000)