parse_num is a small library to parse atoms with a 'numeric' representation into the equivalent scalar.
For example, given the atom seventy_five, then parse_num:parse(seventy_five) returns the scalar 75.
parse_num works with representations ranging from zero to 10^9 - 1 (or, one less than one quadrillion).
-
parse_num:parse(one)%% returns 1 -
parse_num:parse(two)%% returns 2 -
parse_num:parse(twice)%% also returns 2 -
parse_num:parse(two_thousand_three_hundred)%% returns 2300 -
parse_num:parse(twenty_three_hundred)%% also returns 2300 -
parse_num:parse(nine_billion_eight_hundred_and_seventy_million_six_hundred_thousand_and_one);; returns 9870600001
parse_num works with both 'grammatically correct' representations (e.g. two_thousand_three_hundred above) and 'colloquial' representations (e.g. twenty_three_hundred).
parse_num is forgiving: for example, you do not need to correctly employ and (for which there exists specific rules).
parse_num is useful for e.g. Domain-Specific Language development; I wrote it for just such a project merlin but thought to release it on its own in case others find it useful.
Rails provides a similar facility that uses Ruby symbols, and leverages it to good effect in their API.
Please log any defects in the Issue Tracker.
- floating-point numbers
- negative numbers
Copyright (C) 2011 Edward Garson
Distributed under the terms of the MIT license as described by the included file MIT-LICENSE.