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8 References
In any semantic expression, you can write ‘ref()’ which is a reference to whichever part of the input is matched by the current rule. The type of ‘ref()’ is ‘ref_t’, an opaque type. A number of helper functions exist to do useful things with ‘ref_t’ values. In this case, we can utilize the helper function ‘ref_0()’ which returns the first byte of a ‘ref_t’ value.
Digit <- [0-9] -> { ref_0(ref()) - '0' }
Last updated: 2016-08-03 21:39:50 UTC
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