Mercurial > lbo > hg > pcombinators

changeset 41:23a3dfc26014 draft

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Fix index overflow in ParseState
author Lewin Bormann <lbo@spheniscida.de>
date Thu, 23 May 2019 19:58:43 +0200
parents e9cb1d6b12d3
children 24d3a2ae7031
files pcombinators/state.py
diffstat 1 files changed, 4 insertions(+), 0 deletions(-) [+]
line wrap: on
line diff
--- a/pcombinators/state.py	Thu May 23 19:54:54 2019 +0200
+++ b/pcombinators/state.py	Thu May 23 19:58:43 2019 +0200
@@ -181,6 +181,8 @@
             return 'ParseState({}<>)'.format(self._input)
 
     def next(self):
+        if self.finished():
+            return None
         current = self.peek()
         self._index += 1
         return current
@@ -189,6 +191,8 @@
         self._index += n
 
     def peek(self):
+        if self.finished():
+            return None
         return self._input[self._index]
 
     def index(self):