jsonpath_lib 0.3.0

It is JsonPath engine written in Rust. it provide a similar API interface in Webassembly and Javascript too. - Webassembly Demo: https://freestrings.github.io/jsonpath
Documentation 
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#[macro_use]
extern crate serde_json;

use common::{select_and_then_compare, setup};

mod common;

#[test]
fn dolla_token_in_path() {
    setup();

    select_and_then_compare(
        "$..$ref",
        json!({
                "Junk1": "This is a test to illustrate use of '$' in the attr for the expression $..['$ref'] ",
                "$ref": "Match Root",
                "Subset1":[
                    {"Junk2": "Data...",
                     "$ref": "Match Subset1"
                    }
                ],
                "hierachy1":{
                    "hierachy2.1":{
                        "hierachy2.1.1":{ "$ref":"Match 2.1.1"},
                        "hierachy2.1.2":{ "ref":"Match 2.1.2"},
                        "hierachy2.1.3":{ "ref":"No Match 2.1.3"},
                        "hierachy2.1.4":{ "$ref":"Match 2.1.4"},
                        "hierachy2.1.5":{ "ref":"No Match 2.1.5"}
                    },
                    "hierachy2.2":{
                        "hierachy2.2.1":{ "ref":"No Match 2.2.1"},
                        "hierachy2.2.2":{ "$ref":"Match 2.2.2"},
                        "hierachy2.2.3":{ "ref":"No Match 2.2.3"},
                        "hierachy2.2.4":{ "ref":"No Match 2.2.5"},
                        "hierachy2.2.5":{ "$ref":"Match 2.2.5"}
                    },
                    "hierachy2.3":{
                        "hierachy2.3.1":{ "ref":"No Match 2.3.1"},
                        "hierachy2.3.2":{ "ref":"No Match 2.3.2"},
                        "hierachy2.3.3":{ "ref":"No Match 2.3.3"},
                        "hierachy2.3.4":{ "ref":"No Match 2.3.4"},
                        "hierachy2.3.5":{ "ref":"No Match 2.3.5"},
                        "hierachy2.3.6":{
                            "hierachy2.3.6.1":{ "$ref":"Match 2.3.6.1"},
                            "hierachy2.3.6.2":{ "ref":"No Match 2.3.6.2"},
                            "hierachy2.3.6.3":{ "ref":"No Match 2.3.6.3"},
                            "hierachy2.3.6.4":{ "ref":"No Match 2.3.6.4"},
                            "hierachy2.3.6.5":{ "ref":"No Match 2.3.6.5"}
                            }
                        }
                }
            }),
        json!([
           "Match Root",
           "Match Subset1",
           "Match 2.1.1",
           "Match 2.1.4",
           "Match 2.2.2",
           "Match 2.2.5",
           "Match 2.3.6.1"
        ]),
    );

    select_and_then_compare(
        "$..['$ref']",
        json!({
                "Junk1": "This is a test to illustrate use of '$' in the attr for the expression $..['$ref'] ",
                "$ref": "Match Root",
                "Subset1":[
                    {"Junk2": "Data...",
                     "$ref": "Match Subset1"
                    }
                ],
                "hierachy1":{
                    "hierachy2.1":{
                        "hierachy2.1.1":{ "$ref":"Match 2.1.1"},
                        "hierachy2.1.2":{ "ref":"Match 2.1.2"},
                        "hierachy2.1.3":{ "ref":"No Match 2.1.3"},
                        "hierachy2.1.4":{ "$ref":"Match 2.1.4"},
                        "hierachy2.1.5":{ "ref":"No Match 2.1.5"}
                    },
                    "hierachy2.2":{
                        "hierachy2.2.1":{ "ref":"No Match 2.2.1"},
                        "hierachy2.2.2":{ "$ref":"Match 2.2.2"},
                        "hierachy2.2.3":{ "ref":"No Match 2.2.3"},
                        "hierachy2.2.4":{ "ref":"No Match 2.2.5"},
                        "hierachy2.2.5":{ "$ref":"Match 2.2.5"}
                    },
                    "hierachy2.3":{
                        "hierachy2.3.1":{ "ref":"No Match 2.3.1"},
                        "hierachy2.3.2":{ "ref":"No Match 2.3.2"},
                        "hierachy2.3.3":{ "ref":"No Match 2.3.3"},
                        "hierachy2.3.4":{ "ref":"No Match 2.3.4"},
                        "hierachy2.3.5":{ "ref":"No Match 2.3.5"},
                        "hierachy2.3.6":{
                            "hierachy2.3.6.1":{ "$ref":"Match 2.3.6.1"},
                            "hierachy2.3.6.2":{ "ref":"No Match 2.3.6.2"},
                            "hierachy2.3.6.3":{ "ref":"No Match 2.3.6.3"},
                            "hierachy2.3.6.4":{ "ref":"No Match 2.3.6.4"},
                            "hierachy2.3.6.5":{ "ref":"No Match 2.3.6.5"}
                            }
                        }
                }
            }),
        json!([
           "Match Root",
           "Match Subset1",
           "Match 2.1.1",
           "Match 2.1.4",
           "Match 2.2.2",
           "Match 2.2.5",
           "Match 2.3.6.1"
        ]),
    );
}