faset over fra Z3950 til google books

python/gdata/tlslite/utils/xmltools.py

@@ -0,0 +1,202 @@
+"""Helper functions for XML.
+
+This module has misc. helper functions for working with XML DOM nodes."""
+
+from compat import *
+import os
+import re
+
+if os.name == "java":
+    # Only for Jython
+    from javax.xml.parsers import *
+    import java
+
+    builder = DocumentBuilderFactory.newInstance().newDocumentBuilder()
+
+    def parseDocument(s):
+        stream = java.io.ByteArrayInputStream(java.lang.String(s).getBytes())
+        return builder.parse(stream)
+else:
+    from xml.dom import minidom
+    from xml.sax import saxutils
+
+    def parseDocument(s):
+        return minidom.parseString(s)
+
+def parseAndStripWhitespace(s):
+    try:
+        element = parseDocument(s).documentElement
+    except BaseException, e:
+        raise SyntaxError(str(e))
+    stripWhitespace(element)
+    return element
+
+#Goes through a DOM tree and removes whitespace besides child elements,
+#as long as this whitespace is correctly tab-ified
+def stripWhitespace(element, tab=0):
+    element.normalize()
+
+    lastSpacer = "\n" + ("\t"*tab)
+    spacer = lastSpacer + "\t"
+
+    #Zero children aren't allowed (i.e. <empty/>)
+    #This makes writing output simpler, and matches Canonical XML
+    if element.childNodes.length==0: #DON'T DO len(element.childNodes) - doesn't work in Jython
+        raise SyntaxError("Empty XML elements not allowed")
+
+    #If there's a single child, it must be text context
+    if element.childNodes.length==1:
+        if element.firstChild.nodeType == element.firstChild.TEXT_NODE:
+            #If it's an empty element, remove
+            if element.firstChild.data == lastSpacer:
+                element.removeChild(element.firstChild)
+            return
+        #If not text content, give an error
+        elif element.firstChild.nodeType == element.firstChild.ELEMENT_NODE:
+            raise SyntaxError("Bad whitespace under '%s'" % element.tagName)
+        else:
+            raise SyntaxError("Unexpected node type in XML document")
+
+    #Otherwise there's multiple child element
+    child = element.firstChild
+    while child:
+        if child.nodeType == child.ELEMENT_NODE:
+            stripWhitespace(child, tab+1)
+            child = child.nextSibling
+        elif child.nodeType == child.TEXT_NODE:
+            if child == element.lastChild:
+                if child.data != lastSpacer:
+                    raise SyntaxError("Bad whitespace under '%s'" % element.tagName)
+            elif child.data != spacer:
+                raise SyntaxError("Bad whitespace under '%s'" % element.tagName)
+            next = child.nextSibling
+            element.removeChild(child)
+            child = next
+        else:
+            raise SyntaxError("Unexpected node type in XML document")
+
+
+def checkName(element, name):
+    if element.nodeType != element.ELEMENT_NODE:
+        raise SyntaxError("Missing element: '%s'" % name)
+
+    if name == None:
+        return
+
+    if element.tagName != name:
+        raise SyntaxError("Wrong element name: should be '%s', is '%s'" % (name, element.tagName))
+
+def getChild(element, index, name=None):
+    if element.nodeType != element.ELEMENT_NODE:
+        raise SyntaxError("Wrong node type in getChild()")
+
+    child = element.childNodes.item(index)
+    if child == None:
+        raise SyntaxError("Missing child: '%s'" % name)
+    checkName(child, name)
+    return child
+
+def getChildIter(element, index):
+    class ChildIter:
+        def __init__(self, element, index):
+            self.element = element
+            self.index = index
+
+        def next(self):
+            if self.index < len(self.element.childNodes):
+                retVal = self.element.childNodes.item(self.index)
+                self.index += 1
+            else:
+                retVal = None
+            return retVal
+
+        def checkEnd(self):
+            if self.index != len(self.element.childNodes):
+                raise SyntaxError("Too many elements under: '%s'" % self.element.tagName)
+    return ChildIter(element, index)
+
+def getChildOrNone(element, index):
+    if element.nodeType != element.ELEMENT_NODE:
+        raise SyntaxError("Wrong node type in getChild()")
+    child = element.childNodes.item(index)
+    return child
+
+def getLastChild(element, index, name=None):
+    if element.nodeType != element.ELEMENT_NODE:
+        raise SyntaxError("Wrong node type in getLastChild()")
+
+    child = element.childNodes.item(index)
+    if child == None:
+        raise SyntaxError("Missing child: '%s'" % name)
+    if child != element.lastChild:
+        raise SyntaxError("Too many elements under: '%s'" % element.tagName)
+    checkName(child, name)
+    return child
+
+#Regular expressions for syntax-checking attribute and element content
+nsRegEx = "http://trevp.net/cryptoID\Z"
+cryptoIDRegEx = "([a-km-z3-9]{5}\.){3}[a-km-z3-9]{5}\Z"
+urlRegEx = "http(s)?://.{1,100}\Z"
+sha1Base64RegEx = "[A-Za-z0-9+/]{27}=\Z"
+base64RegEx = "[A-Za-z0-9+/]+={0,4}\Z"
+certsListRegEx = "(0)?(1)?(2)?(3)?(4)?(5)?(6)?(7)?(8)?(9)?\Z"
+keyRegEx = "[A-Z]\Z"
+keysListRegEx = "(A)?(B)?(C)?(D)?(E)?(F)?(G)?(H)?(I)?(J)?(K)?(L)?(M)?(N)?(O)?(P)?(Q)?(R)?(S)?(T)?(U)?(V)?(W)?(X)?(Y)?(Z)?\Z"
+dateTimeRegEx = "\d\d\d\d-\d\d-\d\dT\d\d:\d\d:\d\dZ\Z"
+shortStringRegEx = ".{1,100}\Z"
+exprRegEx = "[a-zA-Z0-9 ,()]{1,200}\Z"
+notAfterDeltaRegEx = "0|([1-9][0-9]{0,8})\Z" #A number from 0 to (1 billion)-1
+booleanRegEx = "(true)|(false)"
+
+def getReqAttribute(element, attrName, regEx=""):
+    if element.nodeType != element.ELEMENT_NODE:
+        raise SyntaxError("Wrong node type in getReqAttribute()")
+
+    value = element.getAttribute(attrName)
+    if not value:
+        raise SyntaxError("Missing Attribute: " + attrName)
+    if not re.match(regEx, value):
+        raise SyntaxError("Bad Attribute Value for '%s': '%s' " % (attrName, value))
+    element.removeAttribute(attrName)
+    return str(value) #de-unicode it; this is needed for bsddb, for example
+
+def getAttribute(element, attrName, regEx=""):
+    if element.nodeType != element.ELEMENT_NODE:
+        raise SyntaxError("Wrong node type in getAttribute()")
+
+    value = element.getAttribute(attrName)
+    if value:
+        if not re.match(regEx, value):
+            raise SyntaxError("Bad Attribute Value for '%s': '%s' " % (attrName, value))
+        element.removeAttribute(attrName)
+        return str(value) #de-unicode it; this is needed for bsddb, for example
+
+def checkNoMoreAttributes(element):
+    if element.nodeType != element.ELEMENT_NODE:
+        raise SyntaxError("Wrong node type in checkNoMoreAttributes()")
+
+    if element.attributes.length!=0:
+        raise SyntaxError("Extra attributes on '%s'" % element.tagName)
+
+def getText(element, regEx=""):
+    textNode = element.firstChild
+    if textNode == None:
+        raise SyntaxError("Empty element '%s'" % element.tagName)
+    if textNode.nodeType != textNode.TEXT_NODE:
+        raise SyntaxError("Non-text node: '%s'" % element.tagName)
+    if not re.match(regEx, textNode.data):
+        raise SyntaxError("Bad Text Value for '%s': '%s' " % (element.tagName, textNode.data))
+    return str(textNode.data) #de-unicode it; this is needed for bsddb, for example
+
+#Function for adding tabs to a string
+def indent(s, steps, ch="\t"):
+    tabs = ch*steps
+    if s[-1] != "\n":
+        s = tabs + s.replace("\n", "\n"+tabs)
+    else:
+        s = tabs + s.replace("\n", "\n"+tabs)
+        s = s[ : -len(tabs)]
+    return s
+
+def escape(s):
+    return saxutils.escape(s)