The interpreter of the FEEL language(Friendly Enough Expression Language) in go, FEEL is broadly used in DMN and BPMN to provide rule engine and script support, the FEEL.go module can be imported into other go projects or used as command line executable as FEEL interpreter.
- run
make buildto build feel interpreter bin/feel - run
make testto run testing
% bin/feel -c '"hello " + "world"'
"hello world"
% bin/feel -c '(function(a, b) a + b)(5, 8)'
13
% bin/feel -c 'if a > 3 then "larger" else "smaller"' -vars '{a: 5}'
"larger"
# dump AST tree instead of evaluating the script
% bin/feel -c 'if a > 3 then "larger" else "smaller"' -ast
(explist (if (> a 3) "larger" "smaller"))
% bin/feel -c 'some x in [3, 4, 8, 9] satisfies x % 2 = 0'
4
% bin/feel -c 'every x in [3, 4, 8, 9] satisfies x % 2 = 0'
[
4,
8
]for more examples please refer to testing
import (
feel "github.com/superisaac/FEEL.go"
)
res, err := feel.EvalString(input)