Bob Nystrom
f093d0a42a
Add MapKeySequence and MapValueSequence classes in core.wren to expose iterable key and value views on Map instances. Implement native iterate_, keyIteratorValue_, and valueIteratorValue_ primitives in wren_core.c to support these sequences. Replace the stub Map.toString with a full implementation that iterates keys and formats each entry as "key: value", handling empty maps and nested maps correctly. Include comprehensive test suites for key iteration, value iteration, iterator type validation, and toString output across multiple orderings.
46 lines
1.2 KiB
Plaintext
46 lines
1.2 KiB
Plaintext
var a = {"one": 1, "two": 2, "three": 3, "four": 4}.keys
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// The precise numeric values aren't defined since they are indexes into the
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// entry table and the hashing process isn't specified. So we just validate
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// what we can assume about them.
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IO.print(a.iterate(null) is Num) // expect: true
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IO.print(a.iterate(null) >= 0) // expect: true
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IO.print(a.iterate(0) is Num) // expect: true
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IO.print(a.iterate(0) > 0) // expect: true
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IO.print(a.iterate(1) is Num) // expect: true
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IO.print(a.iterate(1) > 0) // expect: true
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IO.print(a.iterate(2) is Num) // expect: true
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IO.print(a.iterate(2) > 0) // expect: true
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IO.print(a.iterate(3) is Num) // expect: true
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IO.print(a.iterate(3) > 0) // expect: true
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var previous = -1
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var iterator = a.iterate(null)
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while (iterator) {
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IO.print(iterator > previous)
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IO.print(iterator is Num)
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previous = iterator
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iterator = a.iterate(iterator)
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}
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// First entry:
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// expect: true
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// expect: true
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// Second entry:
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// expect: true
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// expect: true
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// Third entry:
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// expect: true
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// expect: true
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// Fourth entry:
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// expect: true
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// expect: true
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// Out of bounds.
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IO.print(a.iterate(16)) // expect: false
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IO.print(a.iterate(-1)) // expect: false
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// Nothing to iterate in an empty map.
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IO.print({}.keys.iterate(null)) // expect: false
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