Move things around a bit

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diff --git a/abdl.py b/abdl.py
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-# A Boneless Datastructure Language
-# Copyright (C) 2019  Soni L.
-#
-# This program is free software: you can redistribute it and/or modify
-# it under the terms of the GNU Affero General Public License as published by
-# the Free Software Foundation, either version 3 of the License, or
-# (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU Affero General Public License for more details.
-#
-# You should have received a copy of the GNU Affero General Public License
-# along with this program.  If not, see <https://www.gnu.org/licenses/>.
-
-"""A Boneless Datastructure Language, version 2.0.1.
-
-ABDL expressions are regex-like constructs for matching and validating object structures. They can be used
-with JSON and similar formats, and even self-referential data structures.
-
-Language Reference:
-
-    ABDL expressions have the ability to iterate, index, validate and filter data structures. This is
-    done with the use of the syntax elements listed below.
-
-    Syntax Elements:
-
-        An ABDL expression is a sequence of zero or more sequences starting with arrows followed by zero or
-        more subvalues.
-
-        An arrow is ``->`` and indicates indexing/iteration (Mappings, Sequences, Sets). It must be followed
-        by a variable, literal, parameter, regex or key match.
-
-        A variable is a string of alphanumeric characters, not starting with a digit. It may be followed by a
-        literal, parameter, regex, key match, or one or more type tests. A ``(key, value)`` tuple containing
-        the corresponding matched element will be identified by this name in the results dict.
-
-        A literal is a string delimited by single quotes (use ``%'`` to escape ``'`` and ``%%`` to escape ``%``).
-        A literal can be made "non-validating" by appending an ``?`` after it. It may be followed by one or more
-        type tests. It is exactly equivalent to indexing an object with a string key.
-
-        A parameter is the symbol ``$`` followed by a string of alphanumeric characters, not starting with
-        a digit. A parameter can be made "non-validating" by appending an ``?`` after it. It may be followed by
-        one or more type tests. It is exactly equivalent to indexing an object with an arbitrary object key.
-
-        A regex is an RE, as defined by the ``re`` module, delimited by forward slashes (use ``%/`` to escape
-        ``/`` and ``%%`` to escape ``%``). A regex can be made "non-validating" by appending an ``?`` after it.
-        It may be followed by one or more type tests. It attempts to match each key in the object.
-
-        A type test is ``:`` followed by a parameter. A type test can be made "non-validating" by appending
-        an ``?`` after the ``:``. It attempts to match the type of each matched value in the object.
-
-        A key match is an ABDL expression enclosed in ``[`` and ``]``, optionally prefixed with one or more type
-        tests. This matches keys (including the type tests).
-
-        A subvalue is an ABDL expression enclosed in ``(`` and ``)``. This allows matching multiple values on
-        the same object.
-
-        Some syntax elements can be validating or non-validating. Validating syntax elements will raise a
-        :py:exc:`abdl.ValidationError` whenever a non-matching element is encountered, whereas non-validating
-        ones will skip them. Note that it is possible for a validating syntax element to still yield results
-        before raising a :py:exc:`abdl.ValidationError`, so one needs to be careful when writing code where such
-        behaviour could result in a security vulnerability.
-
-    Examples:
-
-        >>> import abdl
-        >>> for m in abdl.match("->X:?$dict->Y", {"foo": 1, "bar": {"baz": 2}}, {'dict': dict}):
-        ...     print(m['X'][0], m['Y'][0], m['Y'][1])
-        bar baz 2
-
-        >>> pat = abdl.compile('''-> 'projects'?
-        ...                          -> commit /[0-9a-fA-F]{40}|[0-9a-fA-F]{64}/? :?$dict
-        ...                             -> url :?$dict
-        ...                                -> branch :?$dict''', {'dict': dict})
-        >>> data = {"projects": {
-        ...     "385e734a52e13949a7a5c71827f6de920dbfea43": {
-        ...         "https://soniex2.autistic.space/git-repos/ganarchy.git": {"HEAD": {"active": True}}
-        ...     }
-        ... }}
-        >>> for m in pat.match(data):
-        ...     print(m['commit'][0], m['url'][0], m['branch'][0], m['branch'][1])
-        385e734a52e13949a7a5c71827f6de920dbfea43 https://soniex2.autistic.space/git-repos/ganarchy.git HEAD {'active': True}
-
-    (If ``:?$dict`` wasn't present, a TypeError would be raised when trying to iterate the ``1`` from ``"foo": 1``.)
-"""
-
-import re
-
-from collections.abc import Mapping, Sequence, Iterator, Set
-
-class DeprecationError(Exception):
-    """Raised for deprecated features, if they are disabled.
-
-    This class controls warning/error behaviour of deprecated features."""
-    #enable_key_match_compat = False
-    #warn_key_match_compat = False
-
-    @classmethod
-    def warn_all(cls):
-        """Enables all deprecation warnings."""
-        pass
-
-class PatternError(Exception):
-    """Raised for invalid input or output expressions."""
-    # TODO implement formatting
-
-    def __init__(self, msg, pattern, defs, pos, toks):
-        self.msg = msg
-        self.pattern = pattern
-        self.defs = defs
-        self.pos = pos
-        self._toks = toks # internal use
-
-    def _normalize(self, pattern, defs):
-        if pattern is not None:
-            if self.pattern is not None:
-                raise ValueError("Attempt to normalize normalized pattern")
-            else:
-                self.pattern = pattern
-        if defs is not None:
-            if self.defs is not None:
-                raise ValueError("Attempt to normalize normalized defs")
-            else:
-                self.defs = defs
-
-    @classmethod
-    def _str_escape(cls, s, pos, toks):
-        raise cls("Error in string escape", None, None, pos, toks)
-
-    @classmethod
-    def _str_end(cls, s, pos, toks):
-        raise cls("Unfinished string", None, None, pos, toks)
-
-    @classmethod
-    def _re_escape(cls, s, pos, toks):
-        raise cls("Error in regex escape", None, None, pos, toks)
-
-    @classmethod
-    def _re_end(cls, s, pos, toks):
-        raise cls("Unfinished regex", None, None, pos, toks)
-
-    @classmethod
-    def _unexpected_tok(cls, s, pos, toks):
-        raise cls("Unexpected token", None, None, pos, toks)
-
-class ValidationError(Exception):
-    """Raised when the object tree doesn't validate against the given pattern."""
-    # FIXME TODO?
-
-class _PatternElement:
-    def on_not_in_key(self, frame, path, defs):
-        raise NotImplementedError
-
-    def on_in_key(self, frame, path, defs):
-        raise NotImplementedError
-
-    def collect_params(self, res: list):
-        pass
-
-class _Arrow(_PatternElement):
-    def on_not_in_key(self, frame, path, defs):
-        assert not path[-1].empty
-        path.append(_Holder(key=None, value=None, name=None, parent=path[-1].value, empty=True))
-        return False
-
-class _StringKey(_PatternElement):
-    def __init__(self, toks):
-        self.key = toks[0]
-        self.skippable = toks[1] == '?'
-
-    def on_in_key(self, frame, path, defs):
-        return self.on_not_in_key(frame, path, defs)
-
-    def on_not_in_key(self, frame, path, defs):
-        path[-1].iterator = self.extract(path[-1].parent)
-        path[-1].empty = False
-        return True
-
-    def extract(self, obj):
-        try:
-            yield (self.key, obj[self.key])
-        except (TypeError, IndexError, KeyError):
-            if not self.skippable:
-                raise ValidationError
-
-class _RegexKey(_PatternElement):
-    def __init__(self, toks):
-        self.key = toks[0]
-        self.compiled = re.compile(self.key)
-        self.skippable = toks[1] == '?'
-
-    def on_in_key(self, frame, path, defs):
-        return self.on_not_in_key(frame, path, defs)
-
-    def on_not_in_key(self, frame, path, defs):
-        filtered_iterator = self.filter(path[-1].iterator)
-        del path[-1].iterator
-        path[-1].iterator = filtered_iterator
-        del filtered_iterator
-        path[-1].empty = False
-        return True
-
-    def filter(self, it):
-        for el in it:
-            try:
-                if self.compiled.search(el[0]):
-                    yield el
-                elif not self.skippable:
-                    raise ValidationError
-            except TypeError:
-                if not self.skippable:
-                    raise ValidationError
-
-class _KeySubtree(_PatternElement):
-    def __init__(self, toks):
-        self.key = toks[0]
-        self.skippable = toks[1] == '?'
-
-    def on_not_in_key(self, frame, path, defs):
-        path[-1].subtree = True
-        filtered_iterator = self.filter(path[-1].iterator, defs)
-        del path[-1].iterator
-        path[-1].iterator = filtered_iterator
-        del filtered_iterator
-        path[-1].empty = False
-        return True
-
-    def filter(self, it, defs):
-        for x in it:
-            for y in _match_helper(self.key, defs, x[0]):
-                yield (y, x[1])
-
-    def collect_params(self, res: list):
-        for sub in self.key:
-            sub.collect_params(res)
-
-class _ValueSubtree(_PatternElement):
-    def __init__(self, toks):
-        self.key = toks[0]
-        self.skippable = toks[1] == '?'
-
-    def on_not_in_key(self, frame, path, defs):
-        assert not path[-1].empty
-        path.append(_Holder(key=None, value=None, name=None, parent=path[-1].value, empty=False, subtree=True))
-        path[-1].iterator = self.filter(path[-1].parent, defs)
-        return True
-
-    def filter(self, parent, defs):
-        for x in _match_helper(self.key, defs, parent):
-            yield (x, parent)
-
-    def collect_params(self, res: list):
-        for sub in self.key:
-            sub.collect_params(res)
-
-class _Ident(_PatternElement):
-    def __init__(self, toks):
-        self.key = toks[0]
-
-    def on_not_in_key(self, frame, path, defs):
-        path[-1].name = self.key
-        path[-1].empty = False
-        return True
-
-class _Param(_PatternElement):
-    def __init__(self, toks):
-        assert isinstance(toks[1], _Ident)
-        self.skippable = toks[0] == '?'
-        self.key = toks[1].key
-
-    def on_in_key(self, frame, path, defs):
-        return self.on_not_in_key(frame, path, defs)
-
-    def on_not_in_key(self, frame, path, defs):
-        path[-1].iterator = self.extract(path[-1].parent, defs[self.key])
-        path[-1].empty = False
-        return True
-
-    def extract(self, obj, key):
-        try:
-            yield (key, obj[key])
-        except (TypeError, IndexError, KeyError):
-            if not self.skippable:
-                raise ValidationError
-
-    def collect_params(self, res: list):
-        res.append(self.key)
-    
-    def get_value(self, defs):
-        return defs[self.key]
-
-class _Ty(_PatternElement):
-    def __init__(self, toks):
-        assert isinstance(toks[1], _Ident)
-        self.skippable = toks[0] == '?'
-        self.key = toks[1].key
-
-    def on_in_key(self, frame, path, defs):
-        filtered_iterator = self.filter(path[-1].iterator, defs[self.key])
-        del path[-1].iterator
-        path[-1].iterator = filtered_iterator
-        del filtered_iterator
-        path[-1].empty = False
-        return True
-
-    def on_not_in_key(self, frame, path, defs):
-        assert len(path) == 1
-        if isinstance(path[-1].value, defs[self.key]):
-            return False
-        elif not self.skippable:
-            raise ValidationError
-        path.clear()
-        return False
-
-    def filter(self, it, ty):
-        for el in it:
-            # this may TypeError if ty is not a type nor a tuple of types
-            # but that's actually the programmer's error
-            if isinstance(el[1], ty):
-                yield el
-            elif not self.skippable:
-                # and this one is for actual validation
-                raise ValidationError
-
-    def collect_params(self, res: list):
-        res.append(self.key)
-
-class _End(_PatternElement):
-    def on_in_key(self, frame, path, defs):
-        try:
-            path[-1].next()
-            return False
-        except StopIteration:
-            path.pop()
-            while frame.prev() and not isinstance(frame.current_op, _End):
-                pass
-            if not frame.prev():
-                # FIXME?
-                path.clear()
-        return True # FIXME?
-
-def _build_syntax():
-    from pyparsing import Suppress, Literal, Forward, CharsNotIn, StringEnd, Combine, Optional, Group, Word, srange, Empty
-    # original regex order: arrow, type/parameter/identifier, string, regex, failure
-    # better syntax: "arrow" changes from "value" to "key" and thus you need at least one key match before an arrow
-    subtree = Forward()
-    # where relevant, enforces match behaviour (skippable object tree branch vs required object tree branch)
-    skippable = Optional("?", default="")
-    #   r"|'(?:%'|%%|%(?P<EES>.|$)|[^%'])*?(?:'|(?P<ES>$))\??" # string literals
-    str_literal = (Combine(Suppress("'")
-            + (Suppress("%") + "'" | Suppress("%") + "%" | Literal("%") + (CharsNotIn("") | StringEnd()).setParseAction(PatternError._str_escape) | CharsNotIn("%'"))[...]
-            + (Suppress("'") | StringEnd().setParseAction(PatternError._str_end))) + skippable).setParseAction(lambda toks: [_StringKey(toks)])
-    #   r"|/(?:%/|%%|%(?P<EER>.|$)|[^%/])*?(?:/|(?P<ER>$))\??" # regex
-    re_literal = (Combine(Suppress("/")
-            + (Suppress("%") + "/" | Suppress("%") + "%" | Literal("%") + (CharsNotIn("") | StringEnd()).setParseAction(PatternError._re_escape) | CharsNotIn("%/"))[...]
-            + (Suppress("/") | StringEnd().setParseAction(PatternError._re_end))) + skippable).setParseAction(lambda toks: [_RegexKey(toks)])
-    arrow = Literal("->").setParseAction(lambda: [_Arrow()])
-    #   r"|(?::\??)?\$?[A-Za-z][A-Za-z0-9]*"                   # identifiers, parameters and type matches
-    identifier = Word(srange("[A-Za-z_]"), srange("[A-Za-z0-9_]")).setParseAction(lambda toks: [_Ident(toks)])
-    parameter = (Suppress("$") + skippable + identifier).setParseAction(lambda toks: [_Param(toks)])
-    ty = (Suppress(":") + skippable + Suppress("$") + identifier).setParseAction(lambda toks: [_Ty(toks)])
-    # support for objects-as-keys
-    keysubtree = (Suppress("[") + Group(ty[...] + subtree) + (Suppress("]") | CharsNotIn("").setParseAction(PatternError._unexpected_tok) | StringEnd().setParseAction(PatternError._unexpected_tok)) + Optional("?", default="")).setParseAction(lambda toks: [_KeySubtree(toks)])
-    # represents key matching - switches from "key" to "value"
-    tag = (identifier + Optional(parameter | str_literal | re_literal | keysubtree) | parameter | str_literal | re_literal | keysubtree) + ty[...] + Empty().setParseAction(lambda: [_End()])
-    # multiple value matching
-    valuesubtree = (Suppress("(") + Group(subtree) + (Suppress(")") | CharsNotIn("").setParseAction(PatternError._unexpected_tok) | StringEnd().setParseAction(PatternError._unexpected_tok)) + Optional("?", default="")).setParseAction(lambda toks: [_ValueSubtree(toks)])
-    # arrow and tag, value subtree
-    subtree <<= (arrow + tag)[...] + (valuesubtree + Empty().setParseAction(lambda: [_End()]))[...]
-    return ((subtree | CharsNotIn("").setParseAction(PatternError._unexpected_tok)) + StringEnd()).parseWithTabs()
-
-_built_syntax = _build_syntax()
-
-def _pairs(o):
-    if isinstance(o, Mapping):
-        return iter(o.items())
-    elif isinstance(o, Sequence):
-        return iter(enumerate(o, 0))
-    elif isinstance(o, Set):
-        return iter(((e, e) for e in o))
-    else:
-        # maybe there's more stuff I can implement later
-        raise TypeError
-
-class _Holder:
-    def __init__(self, key, value, name, parent=None, it=None, empty=False, subtree=False):
-        self.name = name
-        self.key = key
-        self.value = value
-        self.empty = empty
-        self._it = it
-        self.parent = parent
-        self.subtree = subtree
-
-    @property
-    def iterator(self):
-        if self._it is None:
-            self._it = _pairs(self.parent)
-        return self._it
-
-    @iterator.setter
-    def iterator(self, value):
-        assert self._it is None
-        self._it = value
-
-    @iterator.deleter
-    def iterator(self):
-        self._it = None
-
-    def next(self):
-        self.key, self.value = next(self.iterator)
-
-class _Frame:
-    def __init__(self, ops):
-        self.ops = ops
-        self.pc = -1
-
-    def next(self):
-        pc = self.pc + 1
-        if pc >= len(self.ops):
-            return False
-        self.pc = pc
-        return True
-
-    @property
-    def current_op(self):
-        return self.ops[self.pc]
-
-    def prev(self):
-        pc = self.pc - 1
-        if pc < 0:
-            return False
-        self.pc = pc
-        return True
-
-def _match_helper(ops, defs, tree):
-    frame = _Frame(ops)
-
-    path = [_Holder(key=None, value=tree, parent=None, it=iter(()), name=None)]
-    in_key = False
-    while path:
-        if not frame.next():
-            assert not path[-1].empty
-            res = {}
-            for h in path:
-                if h.subtree:
-                    for name, kv in h.key.items():
-                        res[name] = kv
-                elif h.name is not None:
-                    res[h.name] = (h.key, h.value)
-            yield res
-            assert len(path) == 1 or isinstance(frame.current_op, _End)
-            frame.prev()
-            in_key = True
-        else:
-            op = frame.current_op
-            if in_key:
-                in_key = op.on_in_key(frame, path, defs)
-            else:
-                in_key = op.on_not_in_key(frame, path, defs)
-
-class Pattern:
-    """A compiled pattern object.
-
-    Warning:
-        Do not create instances of this class manually. Use :py:func:`abdl.compile`.
-
-    """
-
-    def __init__(self, pattern, defs):
-        try:
-            self._ops = _built_syntax.parseString(pattern)
-        except PatternError as e:
-            e._normalize(pattern, defs)
-            raise
-        else:
-            self._params = []
-            for op in self._ops:
-                op.collect_params(self._params)
-            self._defs = {param: defs[param] for param in self._params}
-
-    def match(self, obj):
-        """Matches this compiled pattern against the given object.
-
-        Args:
-            obj: The object to match against.
-
-        Returns:
-            An iterator. This iterator yields ``(key, value)`` pairs
-            wrapped in a dict for each variable in the pattern.
-
-        """
-        return _match_helper(self._ops, self._defs, obj)
-
-def compile(pattern, defs={}):
-    """Compiles the pattern and returns a compiled :py:class:`abdl.Pattern` object.
-
-    Args:
-        pattern (str): The pattern. Refer to module-level documentation for
-            pattern syntax.
-        defs (dict): The parameter list. Used by parameters in the pattern.
-
-    Returns:
-        Pattern: A compiled pattern object.
-
-    """
-    # TODO caching
-    return Pattern(pattern, defs)
-
-def match(pattern, obj, defs={}):
-    """Matches the pattern against the given obj.
-
-    This method is equivalent to ``abdl.compile(pattern, defs).match(obj)``.
-
-    Args:
-        pattern (str): The pattern. Refer to module-level documentation for
-            pattern syntax.
-        obj: The object to match against.
-        defs (dict): The parameter list. Used by parameters in the pattern.
-
-    Returns:
-        An iterator. This iterator yields ``(key, value)`` pairs
-        wrapped in a dict for each variable in the pattern.
-
-    """
-    return compile(pattern, defs).match(obj)