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Scanning
--------
.. glossary::
keyword
One of the literal words ``bool``, :crowbar:ref:`break`, ``case``,
``char``, ``const``, ``continue``, ``default``, ``do``, ``double``,
``else``, ``enum``, ``extern``, ``float``, ``for``, ``fragile``,
``function``, ``if``, ``include``, ``int``, ``long``, ``return``,
``short``, ``signed``, ``sizeof``, ``struct``, ``switch``,
``unsigned``, ``void``, or ``while``.
identifier
A nonempty sequence of characters blah blah blah
.. todo::
figure out https://www.unicode.org/reports/tr31/tr31-33.html
decimal constant
A sequence of characters matching the regular expression ``[0-9_]+``.
Denotes the numeric value of the given sequence of decimal digits.
Underscores are ignored by the compiler, but may be useful separators for other readers.
binary constant
A sequence of characters matching the regular expression ``0[bB][01_]+``.
Denotes the numeric value of the given sequence of binary digits (after the ``0[bB]`` prefix has been removed).
Underscores are ignored by the compiler, but may be useful separators for other readers.
octal constant
A sequence of characters matching the regular expression ``0o[0-7_]+``.
Denotes the numeric value of the given sequence of octal digits (after the ``0o`` prefix has been removed).
Underscores are ignored by the compiler, but may be useful separators for other readers.
token
A single atomic unit in a Crowbar source file.
Has one (and exactly one) of the following types.
.. todo::
finish transcribing token definitions
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