Add utils.str.multipleReplacer.

src/utils/str.py

@@ -218,6 +218,13 @@ def perlVariableSubstitute(vars, text):
                 return '$' + unbraced
     return _perlVarSubstituteRe.sub(replacer, text)
 
+def multipleReplacer(dict_):
+    """Return a function that replaces all dict keys by the associated
+    value."""
+    dict_ = {re.escape(key): val for key,val in dict_.items()}
+    matcher = re.compile('|'.join(dict_.keys()))
+    return lambda x:matcher.sub(lambda m: dict_[m.group(0)], x)
+
 def commaAndify(seq, comma=',', And='and'):
     """Given a a sequence, returns an English clause for that sequence.
 

test/test_utils.py

@@ -309,6 +309,10 @@ class StrTest(SupyTestCase):
         f = PRTR('s/^/foo/')
         self.assertEqual(f('bar'), 'foobar')
 
+    def testmultipleReplacer(self):
+        replacer = utils.str.multipleReplacer({'foo': 'bar', 'a': 'b'})
+        self.assertEqual(replacer('hi foo hi'), 'hi bar hi')
+
     def testPReToReplacerDifferentSeparator(self):
         f = utils.str.perlReToReplacer('s#foo#bar#')
         self.assertEqual(f('foobarbaz'), 'barbarbaz')