add hg and python

sys/lib/python/xml/etree/ElementPath.py

@@ -0,0 +1,198 @@
+#
+# ElementTree
+# $Id: ElementPath.py 1858 2004-06-17 21:31:41Z 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
+#
+# Copyright (c) 2003-2004 by Fredrik Lundh.  All rights reserved.
+#
+# fredrik@pythonware.com
+# http://www.pythonware.com
+#
+# --------------------------------------------------------------------
+# The ElementTree toolkit is
+#
+# Copyright (c) 1999-2004 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 http://www.python.org/2.4/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.compile(
+    "(::|\.\.|\(\)|[/.*:\[\]\(\)@=])|((?:\{[^}]+\})?[^/:\[\]\(\)@=\s]+)|\s+"
+    ).findall
+
+class xpath_descendant_or_self:
+    pass
+
+##
+# Wrapper for a compiled XPath.
+
+class Path:
+
+    ##
+    # Create an Path instance from an XPath expression.
+
+    def __init__(self, path):
+        tokens = xpath_tokenizer(path)
+        # the current version supports 'path/path'-style expressions only
+        self.path = []
+        self.tag = None
+        if tokens and tokens[0][0] == "/":
+            raise SyntaxError("cannot use absolute path on element")
+        while tokens:
+            op, tag = tokens.pop(0)
+            if tag or op == "*":
+                self.path.append(tag or op)
+            elif op == ".":
+                pass
+            elif op == "/":
+                self.path.append(xpath_descendant_or_self())
+                continue
+            else:
+                raise SyntaxError("unsupported path syntax (%s)" % op)
+            if tokens:
+                op, tag = tokens.pop(0)
+                if op != "/":
+                    raise SyntaxError(
+                        "expected path separator (%s)" % (op or tag)
+                        )
+        if self.path and isinstance(self.path[-1], xpath_descendant_or_self):
+            raise SyntaxError("path cannot end with //")
+        if len(self.path) == 1 and isinstance(self.path[0], type("")):
+            self.tag = self.path[0]
+
+    ##
+    # Find first matching object.
+
+    def find(self, element):
+        tag = self.tag
+        if tag is None:
+            nodeset = self.findall(element)
+            if not nodeset:
+                return None
+            return nodeset[0]
+        for elem in element:
+            if elem.tag == tag:
+                return elem
+        return None
+
+    ##
+    # Find text for first matching object.
+
+    def findtext(self, element, default=None):
+        tag = self.tag
+        if tag is None:
+            nodeset = self.findall(element)
+            if not nodeset:
+                return default
+            return nodeset[0].text or ""
+        for elem in element:
+            if elem.tag == tag:
+                return elem.text or ""
+        return default
+
+    ##
+    # Find all matching objects.
+
+    def findall(self, element):
+        nodeset = [element]
+        index = 0
+        while 1:
+            try:
+                path = self.path[index]
+                index = index + 1
+            except IndexError:
+                return nodeset
+            set = []
+            if isinstance(path, xpath_descendant_or_self):
+                try:
+                    tag = self.path[index]
+                    if not isinstance(tag, type("")):
+                        tag = None
+                    else:
+                        index = index + 1
+                except IndexError:
+                    tag = None # invalid path
+                for node in nodeset:
+                    new = list(node.getiterator(tag))
+                    if new and new[0] is node:
+                        set.extend(new[1:])
+                    else:
+                        set.extend(new)
+            else:
+                for node in nodeset:
+                    for node in node:
+                        if path == "*" or node.tag == path:
+                            set.append(node)
+            if not set:
+                return []
+            nodeset = set
+
+_cache = {}
+
+##
+# (Internal) Compile path.
+
+def _compile(path):
+    p = _cache.get(path)
+    if p is not None:
+        return p
+    p = Path(path)
+    if len(_cache) >= 100:
+        _cache.clear()
+    _cache[path] = p
+    return p
+
+##
+# Find first matching object.
+
+def find(element, path):
+    return _compile(path).find(element)
+
+##
+# Find text for first matching object.
+
+def findtext(element, path, default=None):
+    return _compile(path).findtext(element, default)
+
+##
+# Find all matching objects.
+
+def findall(element, path):
+    return _compile(path).findall(element)