Expand description
JSON query language interpreter.
This crate allows you to execute jq-like filters.
The example below demonstrates how to use this crate.
See the implementation in the jaq crate if you are interested in how to:
- enable usage of the standard library,
- load JSON files lazily,
- handle errors etc.
use jaq_core::{parse, Ctx, Definitions, Error, Val};
use serde_json::{json, Value};
let input = json!(["Hello", "world"]);
let filter = ".[]";
// start out only from core filters,
// which do not include filters in the standard library
// such as `map`, `select` etc.
let defs = Definitions::core();
// parse the filter in the context of the given definitions
let mut errs = Vec::new();
let f = parse::parse(&filter, parse::main()).0.unwrap();
let f = defs.finish(f, Vec::new(), &mut errs);
assert_eq!(errs, Vec::new());
// iterator over the output values
let mut out = f.run(Ctx::new(), Val::from(input));
assert_eq!(out.next(), Some(Ok(Val::from(json!("Hello")))));;
assert_eq!(out.next(), Some(Ok(Val::from(json!("world")))));;
assert_eq!(out.next(), None);;Re-exports
pub use jaq_parse as parse;Structs
Link names and arities to corresponding filters.
Function from a value to a stream of value results.
Enums
Type Definitions
Variable bindings.