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#### Mercurial (d1ed7de67f5a)

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``````import WebIDL
``````import itertools
``````import string
``````
``````# We'd like to use itertools.chain but it's 2.6 or higher.
``````def chain(*iterables):
``````    # chain('ABC', 'DEF') --> A B C D E F
``````    for it in iterables:
``````        for element in it:
``````            yield element
``````
``````# We'd like to use itertools.combinations but it's 2.6 or higher.
``````def combinations(iterable, r):
``````    # combinations('ABCD', 2) --> AB AC AD BC BD CD
``````    # combinations(range(4), 3) --> 012 013 023 123
``````    pool = tuple(iterable)
``````    n = len(pool)
``````    if r > n:
``````        return
``````    indices = range(r)
``````    yield tuple(pool[i] for i in indices)
``````    while True:
``````        for i in reversed(range(r)):
``````            if indices[i] != i + n - r:
``````                break
``````        else:
``````            return
``````        indices[i] += 1
``````        for j in range(i+1, r):
``````            indices[j] = indices[j-1] + 1
``````        yield tuple(pool[i] for i in indices)
``````
``````# We'd like to use itertools.combinations_with_replacement but it's 2.7 or
``````# higher.
``````def combinations_with_replacement(iterable, r):
``````    # combinations_with_replacement('ABC', 2) --> AA AB AC BB BC CC
``````    pool = tuple(iterable)
``````    n = len(pool)
``````    if not n and r:
``````        return
``````    indices = [0] * r
``````    yield tuple(pool[i] for i in indices)
``````    while True:
``````        for i in reversed(range(r)):
``````            if indices[i] != n - 1:
``````                break
``````        else:
``````            return
``````        indices[i:] = [indices[i] + 1] * (r - i)
``````        yield tuple(pool[i] for i in indices)
``````
``````def WebIDLTest(parser, harness):
``````    types = ["float",
``````             "double",
``````             "short",
``````             "unsigned short",
``````             "long",
``````             "unsigned long",
``````             "long long",
``````             "unsigned long long",
``````             "boolean",
``````             "byte",
``````             "octet",
``````             "DOMString",
``````             "ByteString",
``````             "ScalarValueString",
``````             #"sequence<float>",
``````             "object",
``````             "ArrayBuffer",
``````             #"Date",
``````             "TestInterface1",
``````             "TestInterface2"]
``````
``````    testPre = """
``````        interface TestInterface1 {
``````        };
``````        interface TestInterface2 {
``````        };
``````        """
``````
``````    interface = testPre + """
``````        interface PrepareForTest {
``````        """
``````    for (i, type) in enumerate(types):
``````        interface += string.Template("""
``````          readonly attribute \${type} attr\${i};
``````        """).substitute(i=i, type=type)
``````    interface += """
``````        };
``````        """
``````
``````    parser.parse(interface)
``````    results = parser.finish()
``````
``````    iface = results[2]
``````
``````    parser = parser.reset()
``````
``````    def typesAreDistinguishable(t):
``````        return all(u[0].isDistinguishableFrom(u[1]) for u in combinations(t, 2))
``````    def typesAreNotDistinguishable(t):
``````        return any(not u[0].isDistinguishableFrom(u[1]) for u in combinations(t, 2))
``````    def unionTypeName(t):
``````        if len(t) > 2:
``````            t[0:2] = [unionTypeName(t[0:2])]
``````        return "(" + " or ".join(t) + ")"
``````
``````    # typeCombinations is an iterable of tuples containing the name of the type
``````    # as a string and the parsed IDL type.
``````    def unionTypes(typeCombinations, predicate):
``````        for c in typeCombinations:
``````            if predicate(t[1] for t in c):
``````                yield unionTypeName([t[0] for t in c])
``````
``````    # We limit invalid union types with a union member type to the subset of 3
``````    # types with one invalid combination.
``````    # typeCombinations is an iterable of tuples containing the name of the type
``````    # as a string and the parsed IDL type.
``````    def invalidUnionWithUnion(typeCombinations):
``````        for c in typeCombinations:
``````            if (typesAreNotDistinguishable((c[0][1], c[1][1])) and
``````                typesAreDistinguishable((c[1][1], c[2][1])) and
``````                typesAreDistinguishable((c[0][1], c[2][1]))):
``````                yield unionTypeName([t[0] for t in c])
``````
``````    # Create a list of tuples containing the name of the type as a string and
``````    # the parsed IDL type.
``````    types = zip(types, (a.type for a in iface.members))
``````
``````    validUnionTypes = chain(unionTypes(combinations(types, 2), typesAreDistinguishable),
``````                            unionTypes(combinations(types, 3), typesAreDistinguishable))
``````    invalidUnionTypes = chain(unionTypes(combinations_with_replacement(types, 2), typesAreNotDistinguishable),
``````                              invalidUnionWithUnion(combinations(types, 3)))
``````    interface = testPre + """
``````        interface TestUnion {
``````        """
``````    for (i, type) in enumerate(validUnionTypes):
``````        interface += string.Template("""
``````          void method\${i}(\${type} arg);
``````          \${type} returnMethod\${i}();
``````          attribute \${type} attr\${i};
``````          void arrayMethod\${i}(\${type}[] arg);
``````          \${type}[] arrayReturnMethod\${i}();
``````          attribute \${type}[] arrayAttr\${i};
``````          void optionalMethod\${i}(\${type}? arg);
``````        """).substitute(i=i, type=type)
``````    interface += """
``````        };
``````        """
``````    parser.parse(interface)
``````    results = parser.finish()
``````
``````    parser = parser.reset()
``````
``````    for invalid in invalidUnionTypes:
``````        interface = testPre + string.Template("""
``````            interface TestUnion {
``````              void method(\${type} arg);
``````            };
``````        """).substitute(type=invalid)
``````
``````        threw = False
``````        try:
``````            parser.parse(interface)
``````            results = parser.finish()
``````        except:
``````            threw = True
``````
``````        harness.ok(threw, "Should have thrown.")
``````
``````        parser = parser.reset()
``````