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1 files changed, 423 insertions, 0 deletions

diff --git a/contrib/tools/python3/Lib/xml/etree/ElementPath.py b/contrib/tools/python3/Lib/xml/etree/ElementPath.py
new file mode 100644
index 0000000000..dc6bd28c03
--- /dev/null
+++ b/contrib/tools/python3/Lib/xml/etree/ElementPath.py
@@ -0,0 +1,423 @@
+#
+# ElementTree
+# $Id: ElementPath.py 3375 2008-02-13 08:05:08Z fredrik $
+#
+# limited xpath support for element trees
+#
+# history:
+# 2003-05-23 fl   created
+# 2003-05-28 fl   added support for // etc
+# 2003-08-27 fl   fixed parsing of periods in element names
+# 2007-09-10 fl   new selection engine
+# 2007-09-12 fl   fixed parent selector
+# 2007-09-13 fl   added iterfind; changed findall to return a list
+# 2007-11-30 fl   added namespaces support
+# 2009-10-30 fl   added child element value filter
+#
+# Copyright (c) 2003-2009 by Fredrik Lundh.  All rights reserved.
+#
+# fredrik@pythonware.com
+# http://www.pythonware.com
+#
+# --------------------------------------------------------------------
+# The ElementTree toolkit is
+#
+# Copyright (c) 1999-2009 by Fredrik Lundh
+#
+# By obtaining, using, and/or copying this software and/or its
+# associated documentation, you agree that you have read, understood,
+# and will comply with the following terms and conditions:
+#
+# Permission to use, copy, modify, and distribute this software and
+# its associated documentation for any purpose and without fee is
+# hereby granted, provided that the above copyright notice appears in
+# all copies, and that both that copyright notice and this permission
+# notice appear in supporting documentation, and that the name of
+# Secret Labs AB or the author not be used in advertising or publicity
+# pertaining to distribution of the software without specific, written
+# prior permission.
+#
+# SECRET LABS AB AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD
+# TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANT-
+# ABILITY AND FITNESS.  IN NO EVENT SHALL SECRET LABS AB OR THE AUTHOR
+# BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY
+# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
+# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
+# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
+# OF THIS SOFTWARE.
+# --------------------------------------------------------------------
+
+# Licensed to PSF under a Contributor Agreement.
+# See https://www.python.org/psf/license for licensing details.
+
+##
+# Implementation module for XPath support.  There's usually no reason
+# to import this module directly; the <b>ElementTree</b> does this for
+# you, if needed.
+##
+
+import re
+
+xpath_tokenizer_re = re.compile(
+    r"("
+    r"'[^']*'|\"[^\"]*\"|"
+    r"::|"
+    r"//?|"
+    r"\.\.|"
+    r"\(\)|"
+    r"!=|"
+    r"[/.*:\[\]\(\)@=])|"
+    r"((?:\{[^}]+\})?[^/\[\]\(\)@!=\s]+)|"
+    r"\s+"
+    )
+
+def xpath_tokenizer(pattern, namespaces=None):
+    default_namespace = namespaces.get('') if namespaces else None
+    parsing_attribute = False
+    for token in xpath_tokenizer_re.findall(pattern):
+        ttype, tag = token
+        if tag and tag[0] != "{":
+            if ":" in tag:
+                prefix, uri = tag.split(":", 1)
+                try:
+                    if not namespaces:
+                        raise KeyError
+                    yield ttype, "{%s}%s" % (namespaces[prefix], uri)
+                except KeyError:
+                    raise SyntaxError("prefix %r not found in prefix map" % prefix) from None
+            elif default_namespace and not parsing_attribute:
+                yield ttype, "{%s}%s" % (default_namespace, tag)
+            else:
+                yield token
+            parsing_attribute = False
+        else:
+            yield token
+            parsing_attribute = ttype == '@'
+
+
+def get_parent_map(context):
+    parent_map = context.parent_map
+    if parent_map is None:
+        context.parent_map = parent_map = {}
+        for p in context.root.iter():
+            for e in p:
+                parent_map[e] = p
+    return parent_map
+
+
+def _is_wildcard_tag(tag):
+    return tag[:3] == '{*}' or tag[-2:] == '}*'
+
+
+def _prepare_tag(tag):
+    _isinstance, _str = isinstance, str
+    if tag == '{*}*':
+        # Same as '*', but no comments or processing instructions.
+        # It can be a surprise that '*' includes those, but there is no
+        # justification for '{*}*' doing the same.
+        def select(context, result):
+            for elem in result:
+                if _isinstance(elem.tag, _str):
+                    yield elem
+    elif tag == '{}*':
+        # Any tag that is not in a namespace.
+        def select(context, result):
+            for elem in result:
+                el_tag = elem.tag
+                if _isinstance(el_tag, _str) and el_tag[0] != '{':
+                    yield elem
+    elif tag[:3] == '{*}':
+        # The tag in any (or no) namespace.
+        suffix = tag[2:]  # '}name'
+        no_ns = slice(-len(suffix), None)
+        tag = tag[3:]
+        def select(context, result):
+            for elem in result:
+                el_tag = elem.tag
+                if el_tag == tag or _isinstance(el_tag, _str) and el_tag[no_ns] == suffix:
+                    yield elem
+    elif tag[-2:] == '}*':
+        # Any tag in the given namespace.
+        ns = tag[:-1]
+        ns_only = slice(None, len(ns))
+        def select(context, result):
+            for elem in result:
+                el_tag = elem.tag
+                if _isinstance(el_tag, _str) and el_tag[ns_only] == ns:
+                    yield elem
+    else:
+        raise RuntimeError(f"internal parser error, got {tag}")
+    return select
+
+
+def prepare_child(next, token):
+    tag = token[1]
+    if _is_wildcard_tag(tag):
+        select_tag = _prepare_tag(tag)
+        def select(context, result):
+            def select_child(result):
+                for elem in result:
+                    yield from elem
+            return select_tag(context, select_child(result))
+    else:
+        if tag[:2] == '{}':
+            tag = tag[2:]  # '{}tag' == 'tag'
+        def select(context, result):
+            for elem in result:
+                for e in elem:
+                    if e.tag == tag:
+                        yield e
+    return select
+
+def prepare_star(next, token):
+    def select(context, result):
+        for elem in result:
+            yield from elem
+    return select
+
+def prepare_self(next, token):
+    def select(context, result):
+        yield from result
+    return select
+
+def prepare_descendant(next, token):
+    try:
+        token = next()
+    except StopIteration:
+        return
+    if token[0] == "*":
+        tag = "*"
+    elif not token[0]:
+        tag = token[1]
+    else:
+        raise SyntaxError("invalid descendant")
+
+    if _is_wildcard_tag(tag):
+        select_tag = _prepare_tag(tag)
+        def select(context, result):
+            def select_child(result):
+                for elem in result:
+                    for e in elem.iter():
+                        if e is not elem:
+                            yield e
+            return select_tag(context, select_child(result))
+    else:
+        if tag[:2] == '{}':
+            tag = tag[2:]  # '{}tag' == 'tag'
+        def select(context, result):
+            for elem in result:
+                for e in elem.iter(tag):
+                    if e is not elem:
+                        yield e
+    return select
+
+def prepare_parent(next, token):
+    def select(context, result):
+        # FIXME: raise error if .. is applied at toplevel?
+        parent_map = get_parent_map(context)
+        result_map = {}
+        for elem in result:
+            if elem in parent_map:
+                parent = parent_map[elem]
+                if parent not in result_map:
+                    result_map[parent] = None
+                    yield parent
+    return select
+
+def prepare_predicate(next, token):
+    # FIXME: replace with real parser!!! refs:
+    # http://javascript.crockford.com/tdop/tdop.html
+    signature = []
+    predicate = []
+    while 1:
+        try:
+            token = next()
+        except StopIteration:
+            return
+        if token[0] == "]":
+            break
+        if token == ('', ''):
+            # ignore whitespace
+            continue
+        if token[0] and token[0][:1] in "'\"":
+            token = "'", token[0][1:-1]
+        signature.append(token[0] or "-")
+        predicate.append(token[1])
+    signature = "".join(signature)
+    # use signature to determine predicate type
+    if signature == "@-":
+        # [@attribute] predicate
+        key = predicate[1]
+        def select(context, result):
+            for elem in result:
+                if elem.get(key) is not None:
+                    yield elem
+        return select
+    if signature == "@-='" or signature == "@-!='":
+        # [@attribute='value'] or [@attribute!='value']
+        key = predicate[1]
+        value = predicate[-1]
+        def select(context, result):
+            for elem in result:
+                if elem.get(key) == value:
+                    yield elem
+        def select_negated(context, result):
+            for elem in result:
+                if (attr_value := elem.get(key)) is not None and attr_value != value:
+                    yield elem
+        return select_negated if '!=' in signature else select
+    if signature == "-" and not re.match(r"\-?\d+$", predicate[0]):
+        # [tag]
+        tag = predicate[0]
+        def select(context, result):
+            for elem in result:
+                if elem.find(tag) is not None:
+                    yield elem
+        return select
+    if signature == ".='" or signature == ".!='" or (
+            (signature == "-='" or signature == "-!='")
+            and not re.match(r"\-?\d+$", predicate[0])):
+        # [.='value'] or [tag='value'] or [.!='value'] or [tag!='value']
+        tag = predicate[0]
+        value = predicate[-1]
+        if tag:
+            def select(context, result):
+                for elem in result:
+                    for e in elem.findall(tag):
+                        if "".join(e.itertext()) == value:
+                            yield elem
+                            break
+            def select_negated(context, result):
+                for elem in result:
+                    for e in elem.iterfind(tag):
+                        if "".join(e.itertext()) != value:
+                            yield elem
+                            break
+        else:
+            def select(context, result):
+                for elem in result:
+                    if "".join(elem.itertext()) == value:
+                        yield elem
+            def select_negated(context, result):
+                for elem in result:
+                    if "".join(elem.itertext()) != value:
+                        yield elem
+        return select_negated if '!=' in signature else select
+    if signature == "-" or signature == "-()" or signature == "-()-":
+        # [index] or [last()] or [last()-index]
+        if signature == "-":
+            # [index]
+            index = int(predicate[0]) - 1
+            if index < 0:
+                raise SyntaxError("XPath position >= 1 expected")
+        else:
+            if predicate[0] != "last":
+                raise SyntaxError("unsupported function")
+            if signature == "-()-":
+                try:
+                    index = int(predicate[2]) - 1
+                except ValueError:
+                    raise SyntaxError("unsupported expression")
+                if index > -2:
+                    raise SyntaxError("XPath offset from last() must be negative")
+            else:
+                index = -1
+        def select(context, result):
+            parent_map = get_parent_map(context)
+            for elem in result:
+                try:
+                    parent = parent_map[elem]
+                    # FIXME: what if the selector is "*" ?
+                    elems = list(parent.findall(elem.tag))
+                    if elems[index] is elem:
+                        yield elem
+                except (IndexError, KeyError):
+                    pass
+        return select
+    raise SyntaxError("invalid predicate")
+
+ops = {
+    "": prepare_child,
+    "*": prepare_star,
+    ".": prepare_self,
+    "..": prepare_parent,
+    "//": prepare_descendant,
+    "[": prepare_predicate,
+    }
+
+_cache = {}
+
+class _SelectorContext:
+    parent_map = None
+    def __init__(self, root):
+        self.root = root
+
+# --------------------------------------------------------------------
+
+##
+# Generate all matching objects.
+
+def iterfind(elem, path, namespaces=None):
+    # compile selector pattern
+    if path[-1:] == "/":
+        path = path + "*" # implicit all (FIXME: keep this?)
+
+    cache_key = (path,)
+    if namespaces:
+        cache_key += tuple(sorted(namespaces.items()))
+
+    try:
+        selector = _cache[cache_key]
+    except KeyError:
+        if len(_cache) > 100:
+            _cache.clear()
+        if path[:1] == "/":
+            raise SyntaxError("cannot use absolute path on element")
+        next = iter(xpath_tokenizer(path, namespaces)).__next__
+        try:
+            token = next()
+        except StopIteration:
+            return
+        selector = []
+        while 1:
+            try:
+                selector.append(ops[token[0]](next, token))
+            except StopIteration:
+                raise SyntaxError("invalid path") from None
+            try:
+                token = next()
+                if token[0] == "/":
+                    token = next()
+            except StopIteration:
+                break
+        _cache[cache_key] = selector
+    # execute selector pattern
+    result = [elem]
+    context = _SelectorContext(elem)
+    for select in selector:
+        result = select(context, result)
+    return result
+
+##
+# Find first matching object.
+
+def find(elem, path, namespaces=None):
+    return next(iterfind(elem, path, namespaces), None)
+
+##
+# Find all matching objects.
+
+def findall(elem, path, namespaces=None):
+    return list(iterfind(elem, path, namespaces))
+
+##
+# Find text for first matching object.
+
+def findtext(elem, path, default=None, namespaces=None):
+    try:
+        elem = next(iterfind(elem, path, namespaces))
+        if elem.text is None:
+            return ""
+        return elem.text
+    except StopIteration:
+        return default