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Module path renamed to github.com/hanzoai/eval and the Go package renamed from govaluate to eval. Evaluation, parsing, lexing, and operator behavior are unchanged; MIT license and George Lester attribution retained. See NOTICE for lineage.
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eval
An arbitrary expression evaluator for Go. Parses a string expression once into an
EvaluableExpression, then evaluates it repeatedly against a set of named parameters,
returning a single interface{} result.
Supports arithmetic, comparison, logical, bitwise, ternary, and string operators;
regular-expression matching; membership (in); parameter accessors that reach into
struct fields and map keys (obj.Field); and user-defined functions.
expr, err := eval.NewEvaluableExpression("foo > 0 && bar in ('a', 'b')")
result, err := expr.Evaluate(map[string]interface{}{"foo": 1, "bar": "a"})
// result == true
For a stable set of custom functions, build with
eval.NewEvaluableExpressionWithFunctions. To supply parameters lazily, pass any
value implementing the Parameters interface to Eval.
Provenance
Taken from github.com/casbin/govaluate v1.3.0, itself a fork of
github.com/Knetic/govaluate by George Lester. See NOTICE for the full lineage and
LICENSE for the MIT terms.