From f6c115ff2f56e44f437838b283b6669c75fc5970 Mon Sep 17 00:00:00 2001
From: Fred Drake <fdrake@acm.org>
Date: Fri, 23 Mar 2001 16:42:08 +0000
Subject: Re-write to no longer depend on an old version of PyXML.  This now
 implements a SAX XMLReader interface instead of the old Builder interface
 used with PyDOM (now obsolete).

This only depends on the standard library, not PyXML.
---
 Doc/tools/sgmlconv/esistools.py | 319 ++++++++++++++++++++++++++++++++++------
 1 file changed, 273 insertions(+), 46 deletions(-)

diff --git a/Doc/tools/sgmlconv/esistools.py b/Doc/tools/sgmlconv/esistools.py
index b89476c..40c9121 100644
--- a/Doc/tools/sgmlconv/esistools.py
+++ b/Doc/tools/sgmlconv/esistools.py
@@ -3,26 +3,33 @@ __version__ = '$Revision$'
 
 import re
 import string
-import sys
-import xml.dom.core
-import xml.dom.esis_builder
 
+import xml.dom.pulldom
 
-_data_rx = re.compile(r"[^\\][^\\]*")
+import xml.sax
+import xml.sax.handler
+import xml.sax.xmlreader
+
+
+_data_match = re.compile(r"[^\\][^\\]*").match
 
 def decode(s):
     r = ''
     while s:
-        m = _data_rx.match(s)
+        m = _data_match(s)
         if m:
             r = r + m.group()
-            s = s[len(m.group()):]
+            s = s[m.end():]
         elif s[1] == "\\":
             r = r + "\\"
             s = s[2:]
         elif s[1] == "n":
             r = r + "\n"
             s = s[2:]
+        elif s[1] == "%":
+            s = s[2:]
+            n, s = s.split(";", 1)
+            r = r + unichr(int(n))
         else:
             raise ValueError, "can't handle " + `s`
     return r
@@ -35,49 +42,269 @@ _charmap["\n"] = r"\n"
 _charmap["\\"] = r"\\"
 del c
 
+_null_join = ''.join
 def encode(s):
-    return string.join(map(_charmap.get, s), '')
+    return _null_join(map(_charmap.get, s))
 
 
-class ExtendedEsisBuilder(xml.dom.esis_builder.EsisBuilder):
-    def __init__(self, *args, **kw):
-        self.__empties = {}
-        self.__is_empty = 0
-        apply(xml.dom.esis_builder.EsisBuilder.__init__, (self,) + args, kw)
-        self.buildFragment()
+class ESISReader(xml.sax.xmlreader.XMLReader):
+    """SAX Reader which reads from an ESIS stream.
 
-    def feed(self, data):
-        for line in string.split(data, '\n'):
-            if not line: 
-                break
-            event = line[0]
-            text = line[1:]
-            if event == '(':
-                element = self.document.createElement(text, self.attr_store)
-                self.attr_store = {}
-                self.push(element)
-                if self.__is_empty:
-                    self.__empties[text] = text
-                    self.__is_empty = 0
-            elif event == ')':
-                self.pop()
-            elif event == 'A':
-                l = re.split(' ', text, 2)
-                name = l[0]
-                value = decode(l[2])
-                self.attr_store[name] = value
-            elif event == '-':
-                text = self.document.createText(decode(text))
-                self.push(text)
-            elif event == 'C':
-                return
-            elif event == 'e':
-                self.__is_empty = 1
-            elif event == '&':
-                eref = self.document.createEntityReference(text)
-                self.push(eref)
-            else:
-                sys.stderr.write('Unknown event: %s\n' % line)
+    No verification of the document structure is performed by the
+    reader; a general verifier could be used as the target
+    ContentHandler instance.
+
+    """
+    _decl_handler = None
+    _lexical_handler = None
+
+    _public_id = None
+    _system_id = None
+
+    _buffer = ""
+    _is_empty = 0
+    _lineno = 0
+    _started = 0
+
+    def __init__(self, contentHandler=None, errorHandler=None):
+        xml.sax.xmlreader.XMLReader.__init__(self)
+        self._attrs = {}
+        self._attributes = Attributes(self._attrs)
+        self._locator = Locator()
+        self._empties = {}
+        if contentHandler:
+            self.setContentHandler(contentHandler)
+        if errorHandler:
+            self.setErrorHandler(errorHandler)
 
     def get_empties(self):
-        return self.__empties.keys()
+        return self._empties.keys()
+
+    #
+    #  XMLReader interface
+    #
+
+    def parse(self, source):
+        raise RuntimeError
+        self._locator._public_id = source.getPublicId()
+        self._locator._system_id = source.getSystemId()
+        fp = source.getByteStream()
+        handler = self.getContentHandler()
+        if handler:
+            handler.startDocument()
+        lineno = 0
+        while 1:
+            token, data = self._get_token(fp)
+            if token is None:
+                break
+            lineno = lineno + 1
+            self._locator._lineno = lineno
+            self._handle_token(token, data)
+        handler = self.getContentHandler()
+        if handler:
+            handler.startDocument()
+
+    def feed(self, data):
+        if not self._started:
+            handler = self.getContentHandler()
+            if handler:
+                handler.startDocument()
+            self._started = 1
+        data = self._buffer + data
+        self._buffer = None
+        lines = data.split("\n")
+        if lines:
+            for line in lines[:-1]:
+                self._lineno = self._lineno + 1
+                self._locator._lineno = self._lineno
+                if not line:
+                    e = xml.sax.SAXParseException(
+                        "ESIS input line contains no token type mark",
+                        None, self._locator)
+                    self.getErrorHandler().error(e)
+                else:
+                    self._handle_token(line[0], line[1:])
+            self._buffer = lines[-1]
+        else:
+            self._buffer = ""
+
+    def close(self):
+        handler = self.getContentHandler()
+        if handler:
+            handler.endDocument()
+        self._buffer = ""
+
+    def _get_token(self, fp):
+        try:
+            line = fp.readline()
+        except IOError, e:
+            e = SAXException("I/O error reading input stream", e)
+            self.getErrorHandler().fatalError(e)
+            return
+        if not line:
+            return None, None
+        if line[-1] == "\n":
+            line = line[:-1]
+        if not line:
+            e = xml.sax.SAXParseException(
+                "ESIS input line contains no token type mark",
+                None, self._locator)
+            self.getErrorHandler().error(e)
+            return
+        return line[0], line[1:]
+
+    def _handle_token(self, token, data):
+        handler = self.getContentHandler()
+        if token == '-':
+            if data and handler:
+                handler.characters(decode(data))
+        elif token == ')':
+            if handler:
+                handler.endElement(decode(data))
+        elif token == '(':
+            if self._is_empty:
+                self._empties[data] = 1
+            if handler:
+                handler.startElement(data, self._attributes)
+            self._attrs.clear()
+            self._is_empty = 0
+        elif token == 'A':
+            name, value = data.split(' ', 1)
+            if value != "IMPLIED":
+                type, value = value.split(' ', 1)
+                self._attrs[name] = (decode(value), type)
+        elif token == '&':
+            # entity reference in SAX?
+            pass
+        elif token == '?':
+            if handler:
+                if ' ' in data:
+                    target, data = string.split(data, None, 1)
+                else:
+                    target, data = data, ""
+                handler.processingInstruction(target, decode(data))
+        elif token == 'N':
+            handler = self.getDTDHandler()
+            if handler:
+                handler.notationDecl(data, self._public_id, self._system_id)
+            self._public_id = None
+            self._system_id = None
+        elif token == 'p':
+            self._public_id = decode(data)
+        elif token == 's':
+            self._system_id = decode(data)
+        elif token == 'e':
+            self._is_empty = 1
+        elif token == 'C':
+            pass
+        else:
+            e = SAXParseException("unknown ESIS token in event stream",
+                                  None, self._locator)
+            self.getErrorHandler().error(e)
+
+    def setContentHandler(self, handler):
+        old = self.getContentHandler()
+        if old:
+            old.setDocumentLocator(None)
+        if handler:
+            handler.setDocumentLocator(self._locator)
+        xml.sax.xmlreader.XMLReader.setContentHandler(self, handler)
+
+    def getProperty(self, property):
+        if property == xml.sax.handler.property_lexical_handler:
+            return self._lexical_handler
+
+        elif property == xml.sax.handler.property_declaration_handler:
+            return self._decl_handler
+
+        else:
+            raise xml.sax.SAXNotRecognizedException("unknown property %s"
+                                                    % `property`)
+
+    def setProperty(self, property, value):
+        if property == xml.sax.handler.property_lexical_handler:
+            if self._lexical_handler:
+                self._lexical_handler.setDocumentLocator(None)
+            if value:
+                value.setDocumentLocator(self._locator)
+            self._lexical_handler = value
+
+        elif property == xml.sax.handler.property_declaration_handler:
+            if self._decl_handler:
+                self._decl_handler.setDocumentLocator(None)
+            if value:
+                value.setDocumentLocator(self._locator)
+            self._decl_handler = value
+
+        else:
+            raise xml.sax.SAXNotRecognizedException()
+
+    def getFeature(self, feature):
+        if feature == xml.sax.handler.feature_namespaces:
+            return 1
+        else:
+            return xml.sax.xmlreader.XMLReader.getFeature(self, feature)
+
+    def setFeature(self, feature, enabled):
+        if feature == xml.sax.handler.feature_namespaces:
+            pass
+        else:
+            xml.sax.xmlreader.XMLReader.setFeature(self, feature, enabled)
+
+
+class Attributes(xml.sax.xmlreader.AttributesImpl):
+    # self._attrs has the form {name: (value, type)}
+
+    def getType(self, name):
+        return self._attrs[name][1]
+
+    def getValue(self, name):
+        return self._attrs[name][0]
+
+    def getValueByQName(self, name):
+        return self._attrs[name][0]
+
+    def __getitem__(self, name):
+        return self._attrs[name][0]
+
+    def get(self, name, default=None):
+        if self._attrs.has_key(name):
+            return self._attrs[name][0]
+        return default
+
+    def items(self):
+        L = []
+        for name, (value, type) in self._attrs.items():
+            L.append((name, value))
+        return L
+
+    def values(self):
+        L = []
+        for value, type in self._attrs.values():
+            L.append(value)
+        return L
+
+
+class Locator(xml.sax.xmlreader.Locator):
+    _lineno = -1
+    _public_id = None
+    _system_id = None
+
+    def getLineNumber(self):
+        return self._lineno
+
+    def getPublicId(self):
+        return self._public_id
+
+    def getSystemId(self):
+        return self._system_id
+
+
+def parse(stream_or_string, parser=None):
+    if type(stream_or_string) in [type(""), type(u"")]:
+        stream = open(stream_or_string)
+    else:
+        stream = stream_or_string
+    if not parser:
+        parser = ESISReader()
+    return xml.dom.pulldom.DOMEventStream(stream, parser, (2 ** 14) - 20)
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