From f82e4ab61733c321b583e049700b10c5375d6781 Mon Sep 17 00:00:00 2001
From: Fred Drake <fdrake@acm.org>
Date: Tue, 19 Jan 1999 17:10:31 +0000
Subject: [PATCH] format_attrs():  Attempt a bit more minimization for SGML
 output.

---
 Doc/tools/sgmlconv/esis2sgml.py | 26 ++++++++++++++++++++++----
 1 file changed, 22 insertions(+), 4 deletions(-)

diff --git a/Doc/tools/sgmlconv/esis2sgml.py b/Doc/tools/sgmlconv/esis2sgml.py
index d6f3eb920d..07ca57117b 100755
--- a/Doc/tools/sgmlconv/esis2sgml.py
+++ b/Doc/tools/sgmlconv/esis2sgml.py
@@ -15,15 +15,33 @@ import string
 from xml.utils import escape
 
 
-def format_attrs(attrs):
+def format_attrs(attrs, xml=0):
     attrs = attrs.items()
     attrs.sort()
     s = ''
     for name, value in attrs:
-        s = '%s %s="%s"' % (s, name, escape(value))
+        if xml:
+            s = '%s %s="%s"' % (s, name, escape(value))
+        else:
+            # this is a little bogus, but should do for now
+            if name == value and isnmtoken(value):
+                s = "%s %s" % (s, value)
+            elif istoken(value):
+                s = "%s %s=%s" % (s, name, value)
+            else:
+                s = '%s %s="%s"' % (s, name, escape(value))
     return s
 
 
+_nmtoken_rx = re.compile("[a-z][-._a-z0-9]*", re.IGNORECASE)
+def isnmtoken(s):
+    return _nmtoken_rx.match(s) is not None
+
+_token_rx = re.compile("[a-z0-9][-._a-z0-9]*", re.IGNORECASE)
+def istoken(s):
+    return _token_rx.match(s) is not None
+
+
 def do_convert(ifp, ofp, xml=0):
     attrs = {}
     lastopened = None
@@ -51,9 +69,9 @@ def do_convert(ifp, ofp, xml=0):
                 ofp.write("<!--")
                 continue
             if knownempty and xml:
-                ofp.write("<%s%s/>" % (data, format_attrs(attrs)))
+                ofp.write("<%s%s/>" % (data, format_attrs(attrs, xml)))
             else:
-                ofp.write("<%s%s>" % (data, format_attrs(attrs)))
+                ofp.write("<%s%s>" % (data, format_attrs(attrs, xml)))
             if knownempty and data not in knownempties:
                 # accumulate knowledge!
                 knownempties.append(data)
-- 
2.50.1