From 3f831c81043c888dafeefc820309beb21982cfb5 Mon Sep 17 00:00:00 2001
From: "yusuke.shinyama.dummy"
 <yusuke.shinyama.dummy@1aa58f4a-7d42-0410-adbc-911cccaed67c>
Date: Sun, 13 Jun 2010 04:02:30 +0000
Subject: [PATCH] bugfixes. thanks to Jakub Wilk

git-svn-id: https://pdfminerr.googlecode.com/svn/trunk/pdfminer@226 1aa58f4a-7d42-0410-adbc-911cccaed67c
---
 pdfminer/layout.py    |  5 +++--
 pdfminer/pdfdevice.py | 16 ++++++++--------
 2 files changed, 11 insertions(+), 10 deletions(-)

diff --git a/pdfminer/layout.py b/pdfminer/layout.py
index 79e8f9d..1b756bb 100644
--- a/pdfminer/layout.py
+++ b/pdfminer/layout.py
@@ -528,8 +528,9 @@ def group_lines(groupfunc, objs, findfunc, debug=0):
 
 ##  group_boxes
 ##
-def group_boxes(groupfunc, objs, distfunc, debug=0):
-    assert objs
+def group_boxes(groupfunc, objs0, distfunc, debug=0):
+    assert objs0
+    objs = objs0[:]
     while 2 <= len(objs):
         mindist = INF
         minpair = None
diff --git a/pdfminer/pdfdevice.py b/pdfminer/pdfdevice.py
index 2e3c347..e3af5fb 100644
--- a/pdfminer/pdfdevice.py
+++ b/pdfminer/pdfdevice.py
@@ -1,7 +1,7 @@
 #!/usr/bin/env python
 import sys
-from utils import mult_matrix
-from utils import translate_matrix
+from utils import mult_matrix, translate_matrix
+from utils import enc, bbox2str
 from pdffont import PDFUnicodeNotDefined
 
 
@@ -129,7 +129,7 @@ class TagExtractor(PDFDevice):
         self.outfp = outfp
         self.codec = codec
         self.pageno = 0
-        self.tag = None
+        self.stack = []
         return
 
     def render_string(self, textstate, seq):
@@ -163,16 +163,16 @@ class TagExtractor(PDFDevice):
             s = ''.join( ' %s="%s"' % (enc(k), enc(str(v))) for (k,v)
                          in sorted(props.iteritems()) )
         self.outfp.write('<%s%s>' % (enc(tag.name), s))
-        self.tag = tag
+        self.stack.append(tag)
         return
 
     def end_tag(self):
-        assert self.tag
-        self.outfp.write('</%s>' % enc(self.tag.name))
-        self.tag = None
+        assert self.stack
+        tag = self.stack.pop(-1)
+        self.outfp.write('</%s>' % enc(tag.name))
         return
 
     def do_tag(self, tag, props=None):
         self.begin_tag(tag, props)
-        self.tag = None
+        self.stack.pop(-1)
         return