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py/parse: Allow all constant objects to be used in "X = const(o)".

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Now that constant tuples are supported in the parser, eg (1, True, "str"),
it's a small step to allow anything that is a constant to be used with the
pattern:

    from micropython import const

    X = const(obj)

This commit makes the required changes to allow the following types of
constants:

    from micropython import const

    _INT = const(123)
    _FLOAT = const(1.2)
    _COMPLEX = const(3.4j)
    _STR = const("str")
    _BYTES = const(b"bytes")
    _TUPLE = const((_INT, _STR, _BYTES))
    _TUPLE2 = const((None, False, True, ..., (), _TUPLE))

Prior to this, only integers could be used in const(...).

Signed-off-by: Damien George <damien@micropython.org>
This commit is contained in:
Damien George
2022-04-15 00:45:25 +10:00
parent 761d2f6741
commit 079f3e5e5b
4 changed files with 50 additions and 11 deletions
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docs/reference/constrained.rst
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@@ -112,7 +112,8 @@ with an underscore as in ``_COLS``: this symbol is not visible outside the
module so will not occupy RAM.
The argument to ``const()`` may be anything which, at compile time, evaluates
to an integer e.g. ``0x100`` or ``1 << 8``. It can even include other const
to a constant e.g. ``0x100``, ``1 << 8`` or ``(True, "string", b"bytes")``
(see section below for details). It can even include other const
symbols that have already been defined, e.g. ``1 << BIT``.
**Constant data structures**