Better error reporting on NoMatch exception.

43410d8c · Igor Dejanovic · 429fc379 · 43410d8c
Commit 43410d8c authored Jan 26, 2014 by Igor Dejanovic
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__init__.py arpeggio/__init__.py +4 -0

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--- a/arpeggio/__init__.py
+++ b/arpeggio/__init__.py
@@ -55,6 +55,10 @@ class NoMatch(Exception):
        # By default when NoMatch is thrown we will go up the Parse Model Tree.
        self._up = True

+    def __str__(self):
+        return "Expected %s at position %s." % (self.value,
+                str(self.parser.pos_to_linecol(self.position)))
+

 def flatten(_iterable):
    '''Flattening of python iterables.'''