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Stefan
1224ea4c75
- keys set by only some switch branches are nullable where branches join, in $nodes and in graph output - the (x ?? 0) fix is not offered in graph table cells and switch conditions, where an error means no match - a graph first-hit row whose output can fail no longer makes later rows unreachable - integer schema fields drop gaps without integers; min/max are read through nullable anyOf - columns over the same field path ((x), x['y']) share one dimension; derived columns overlapping another column are left out of gap checks
ZEN Expression Language
The expression language of ZEN Engine, the open-source Business Rules Engine (BRE) from GoRules.
ZEN expressions are readable by business users and fast enough for hot paths: a complete language for conditions, calculations and data transformation, with lexer, parser, compiler, VM, type checking and editor completions included in this crate.
use serde_json::json;
use zen_expression::evaluate_expression;
fn main() {
let result = evaluate_expression(
"sum(items) * multiplier",
json!({ "items": [10, 20, 30], "multiplier": 2 }).into(),
)
.unwrap();
// => 120
}
Reusable expressions compile once via compile_expression and evaluate repeatedly against different contexts.
Resources
- ZEN Expression Language reference - syntax, operators, built-in functions and date operations
- ZEN Engine - the rules engine built on this language
- GoRules - the platform around the open-source engine
- Online Editor - try expressions in the free editor with a built-in simulator