[−][src]Crate rule
A rule engine written in rust. There's also a python fork.
The rule is a json string or rust object of a list expression.
The expression is like [op, arg0, arg1, ..., argn]
, the op
is the operator,
and arg0..n
is the arguments for the operator. Any argument can be another expression.
For writing convenience, the first argument will be tried to resolve as the context parameter.
Or, you can just use the special var
operator to indicate the context parameter.
Usage
#[macro_use] extern crate rule; use rule::{Rule, Result}; fn main() -> Result<()> { let context = json!({"a": 1, "world": "hello"}); // match the context with rules assert!(Rule::new(json!(["=", "a", 1]))?.matches(&context)?); assert!(Rule::new(json!(["=", ["var", "a"], 1]))?.matches(&context)?); assert!(Rule::from_str(r#"["=", ["var", "a"], 1]"#)?.matches(&context)?); assert!(Rule::from_value(["=", "world", "hello"])?.matches(&context)?); // rule! macro assert!(rule!["=", "a", 1]?.matches(&context)?); // collection operators assert!(rule!["in", 1, 1, 2, 3]?.matches(&json!({}))?); assert!(rule!["startswith", "hello", "he"]?.matches(&json!({}))?); assert!(rule!["startswith", "arr", "foo", "bar"]?.matches(&json!({"arr": ["foo", "bar", "baz"]}))?); assert!(rule!["endswith", "arr", "bar", "baz"]?.matches(&json!({"arr": ["foo", "bar", "baz"]}))?); Ok(()) }
Modules
arg | |
error | |
macros | |
op | |
rule |
Macros
json | Construct a |
rule | Construct a |
Structs
Rule | The Rule type, contains an |
Enums
Error |
Type Definitions
Result |