diff --git a/.gitignore b/.gitignore
deleted file mode 100644
index ed8045c..0000000
--- a/.gitignore
+++ /dev/null
@@ -1,54 +0,0 @@
-# Intermediate documents
-*.xps
-
-# Password and Key Files
-*.pem
-*.p12
-
-# Compiled source #
-###################
-*.pyc
-*.com
-*.class
-*.dll
-*.exe
-*.o
-*.so
-
-# Mecurial Files?
-*.i
-*.d
-*.mo
-*.hg/
-
-# Python data files #
-*.shelf
-*.shelve
-
-# Don't track these files, they are output from scripts
-
-# Subversion files
-*.svn-base
-all-wcprops
-entries
-
-# Logs and databases #
-######################
-bulkloader-log-*
-*.log
-*.sql
-*.sql3
-*.sql3-journal
-*.sqlite
-
-# OS generated files #
-######################
-.DS_Store?
-ehthumbs.db
-Icon?
-Thumbs.db
-
-# tmp files #
-#############
-~$*.doc
-~WRL*.tmp
\ No newline at end of file
diff --git a/pdfminer/psparser.py b/pdfminer/psparser.py
index be715af..7232421 100644
--- a/pdfminer/psparser.py
+++ b/pdfminer/psparser.py
@@ -122,7 +122,7 @@ KEYWORD_DICT_END = KWD(b'>>')
 def literal_name(x):
     if not isinstance(x, PSLiteral):
         if STRICT:
-            raise PSTypeError('Literal required: %r' % x)
+            raise PSTypeError('Literal required: %r' % (x,))
         else:
             return str(x)
     return x.name
@@ -131,7 +131,7 @@ def literal_name(x):
 def keyword_name(x):
     if not isinstance(x, PSKeyword):
         if STRICT:
-            raise PSTypeError('Keyword required: %r' % x)
+            raise PSTypeError('Keyword required: %r' % (x,))
         else:
             return str(x)
     return x.name
@@ -361,7 +361,10 @@ class PSBaseParser(object):
             self.hex += c
             return i+1
         if self.hex:
-            self._curtoken += chr(int(self.hex, 16))
+            try:
+                self._curtoken += chr(int(self.hex, 16))
+            except ValueError:
+                pass
         self._parse1 = self._parse_literal
         return i
 
@@ -446,7 +449,10 @@ class PSBaseParser(object):
             self.oct += c
             return i+1
         if self.oct:
-            self._curtoken += chr(int(self.oct, 8))
+            try:
+                self._curtoken += chr(int(self.oct, 8))
+            except ValueError:
+                pass
             self._parse1 = self._parse_string
             return i
         if c in ESC_STRING:
@@ -479,9 +485,12 @@ class PSBaseParser(object):
             return len(s)
         j = m.start(0)
         self._curtoken += s[i:j]
-        token = HEX_PAIR.sub(lambda m: chr(int(m.group(0), 16)),
-                             SPC.sub(b'', self._curtoken))
-        self._add_token(token)
+        try:
+            token = HEX_PAIR.sub(lambda m: chr(int(m.group(0), 16)),
+                                 SPC.sub(b'', self._curtoken))
+            self._add_token(token)
+        except ValueError:
+            pass
         self._parse1 = self._parse_main
         return j
 
@@ -491,7 +500,7 @@ class PSBaseParser(object):
             self.charpos = self._parse1(self.buf, self.charpos)
         token = self._tokens.pop(0)
         if self.debug:
-            logging.debug('nexttoken: %r' % token)
+            logging.debug('nexttoken: %r' % (token,))
         return token
 
 
@@ -532,7 +541,7 @@ class PSStackParser(PSBaseParser):
 
     def add_results(self, *objs):
         if self.debug:
-            logging.debug('add_results: %r' % objs)
+            logging.debug('add_results: %r' % (objs,))
         self.results.extend(objs)
         return
 
@@ -585,7 +594,7 @@ class PSStackParser(PSBaseParser):
                 try:
                     (pos, objs) = self.end_type('d')
                     if len(objs) % 2 != 0:
-                        raise PSSyntaxError('Invalid dictionary construct: %r' % objs)
+                        raise PSSyntaxError('Invalid dictionary construct: %r' % (objs,))
                     # construct a Python dictionary.
                     d = dict((literal_name(k), v) for (k, v) in choplist(2, objs) if v is not None)
                     self.push((pos, d))
@@ -613,7 +622,7 @@ class PSStackParser(PSBaseParser):
                 self.flush()
         obj = self.results.pop(0)
         if self.debug:
-            logging.debug('nextobject: %r' % obj)
+            logging.debug('nextobject: %r' % (obj,))
         return obj