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Cleanup & polish numbers-with-underscores parsing, also improving tests.

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Christian Parpart
2018-08-08 13:38:46 +02:00
committed by Christian Parpart
parent 09a36cba02
commit b9222808f6
12 changed files with 183 additions and 203 deletions
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docs/types.rst
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@@ -285,7 +285,9 @@ Scientific notation is also supported, where the base can have fractions, while
Examples include ``2e10``, ``-2e10``, ``2e-10``, ``2.5e1``.
Underscores can be used to separate the digits of a numeric literal to aid readability.
For example, ``123_000``, ``0x2eff_abde``, ``1233_e348_9a`` are all valid. Underscores are only allowed between two digits. For hex literals, underscores are only allowed to separate groups of 4 hex digits.
For example, decimal ``123_000``, hexadecimal ``0x2eff_abde``, scientific decimal notation ``1_2e345_678`` are all valid.
Underscores are only allowed between two digits and only one consecutive underscore is allowed.
There is no additional semantic meaning added to a number literal containing underscores.
Number literal expressions retain arbitrary precision until they are converted to a non-literal type (i.e. by
using them together with a non-literal expression).