| 1 | # Homogeneous tree for pretty-printing ASDL schemas!
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| 2 | # To avoid bootstrapping problems, it can't be pretty-printed!
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| 3 | # It's generated first with a special flag.
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| 4 |
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| 5 | module hnode {
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| 6 |
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| 7 | color =
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| 8 | TypeName
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| 9 | | StringConst
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| 10 | | OtherConst
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| 11 | | UserType # e.g. for Id
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| 12 | | External
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| 13 |
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| 14 | Field = (str name, hnode val)
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| 15 |
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| 16 | hnode =
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| 17 | # Used to prevent infinite loops
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| 18 | AlreadySeen(int heap_id)
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| 19 | | Record(str node_type, List[Field] fields,
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| 20 | bool abbrev, str left, str right, List[hnode] unnamed_fields)
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| 21 | | Array(List[hnode] children)
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| 22 | | Subtype(str node_type, List[hnode] children)
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| 23 | | Leaf(str s, color color)
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| 24 | # Used for a few value_t variants like value.BuiltinFunc, that point back
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| 25 | # to mycpp classes
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| 26 | | External(any obj)
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| 27 |
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| 28 | # NIL8 pretty-printing -- see doc/pretty-printing.md
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| 29 |
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| 30 | # Idea for bit flags for CreateNull(). NOT part of pretty printing / hnode.
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| 31 | # We just use a single param alloc_lists=True now
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| 32 |
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| 33 | alloc_members =
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| 34 | List
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| 35 | | Dict
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| 36 | | Struct # ASDL product or sum types
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| 37 | generate [bit_set]
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| 38 | # Could also generate alloc_members_b::{None,All}
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| 39 |
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| 40 | # Related:
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| 41 | # - it would be nice to have ASDL value types (pass by value),
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| 42 | # e.g. val[Token] or inline[Token]
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| 43 | # - we should be able to pack i8, i16, u8, u16, or even bitfields
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| 44 | # Point = (int x, int y)
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| 45 | # Point = (int[signed, 16] x, int[unsigned, 8] y)
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| 46 | # It's not i16 and u8 because we recognize C++ implicit int conversions.
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| 47 | # This is storage only.
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| 48 | }
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