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//! JsonPath implementation for Rust //! //! # Example //! ``` //! extern crate jsonpath_lib as jsonpath; //! #[macro_use] extern crate serde_json; //! //! let json_obj = json!({ //! "store": { //! "book": [ //! { //! "category": "reference", //! "author": "Nigel Rees", //! "title": "Sayings of the Century", //! "price": 8.95 //! }, //! { //! "category": "fiction", //! "author": "Evelyn Waugh", //! "title": "Sword of Honour", //! "price": 12.99 //! }, //! { //! "category": "fiction", //! "author": "Herman Melville", //! "title": "Moby Dick", //! "isbn": "0-553-21311-3", //! "price": 8.99 //! }, //! { //! "category": "fiction", //! "author": "J. R. R. Tolkien", //! "title": "The Lord of the Rings", //! "isbn": "0-395-19395-8", //! "price": 22.99 //! } //! ], //! "bicycle": { //! "color": "red", //! "price": 19.95 //! } //! }, //! "expensive": 10 //! }); //! //! let mut selector = jsonpath::selector(&json_obj); //! //! // //! // $.store.book[*].author //! // //! let json = selector("$.store.book[*].author").unwrap(); //! let ret = json!(["Nigel Rees","Evelyn Waugh","Herman Melville","J. R. R. Tolkien"]); //! assert_eq!(json, ret); //! //! // //! // $..author //! // //! let json = selector("$..author").unwrap(); //! let ret = json!(["Nigel Rees","Evelyn Waugh","Herman Melville","J. R. R. Tolkien"]); //! assert_eq!(json, ret); //! //! // //! // $.store.* //! // //! let json = selector("$.store.*").unwrap(); //! let ret = json!([ //! [ //! {"category" : "reference", "author" : "Nigel Rees","title" : "Sayings of the Century", "price" : 8.95}, //! {"category" : "fiction", "author" : "Evelyn Waugh","title" : "Sword of Honour","price" : 12.99}, //! {"category" : "fiction", "author" : "Herman Melville","title" : "Moby Dick","isbn" : "0-553-21311-3","price" : 8.99}, //! {"category" : "fiction", "author" : "J. R. R. Tolkien","title" : "The Lord of the Rings","isbn" : "0-395-19395-8","price" : 22.99} //! ], //! {"color" : "red","price" : 19.95}, //! ]); //! assert_eq!(ret, json); //! //! // //! // $.store..price //! // //! let json = selector("$.store..price").unwrap(); //! let ret = json!([8.95, 12.99, 8.99, 22.99, 19.95]); //! assert_eq!(ret, json); //! //! // //! // $..book[2] //! // //! let json = selector("$..book[2]").unwrap(); //! let ret = json!([{ //! "category" : "fiction", //! "author" : "Herman Melville", //! "title" : "Moby Dick", //! "isbn" : "0-553-21311-3", //! "price" : 8.99 //! }]); //! assert_eq!(ret, json); //! //! // //! // $..book[-2] //! // //! let json = selector("$..book[-2]").unwrap(); //! let ret = json!([{ //! "category" : "fiction", //! "author" : "Herman Melville", //! "title" : "Moby Dick", //! "isbn" : "0-553-21311-3", //! "price" : 8.99 //! }]); //! assert_eq!(ret, json); //! //! // //! // $..book[0,1] //! // //! let json = selector("$..book[0,1]").unwrap(); //! let ret = json!([ //! {"category" : "reference","author" : "Nigel Rees","title" : "Sayings of the Century","price" : 8.95}, //! {"category" : "fiction","author" : "Evelyn Waugh","title" : "Sword of Honour","price" : 12.99} //! ]); //! assert_eq!(ret, json); //! //! // //! // $..book[:2] //! // //! let json = selector("$..book[:2]").unwrap(); //! let ret = json!([ //! {"category" : "reference","author" : "Nigel Rees","title" : "Sayings of the Century","price" : 8.95}, //! {"category" : "fiction","author" : "Evelyn Waugh","title" : "Sword of Honour","price" : 12.99} //! ]); //! assert_eq!(ret, json); //! //! // //! // $..book[2:] //! // //! let json = selector("$..book[2:]").unwrap(); //! let ret = json!([ //! {"category" : "fiction","author" : "Herman Melville","title" : "Moby Dick","isbn" : "0-553-21311-3","price" : 8.99}, //! {"category" : "fiction","author" : "J. R. R. Tolkien","title" : "The Lord of the Rings","isbn" : "0-395-19395-8","price" : 22.99} //! ]); //! assert_eq!(ret, json); //! //! // //! // $..book[?(@.isbn)] //! // //! let json = selector("$..book[?(@.isbn)]").unwrap(); //! let ret = json!([ //! {"category" : "fiction","author" : "Herman Melville","title" : "Moby Dick","isbn" : "0-553-21311-3","price" : 8.99}, //! {"category" : "fiction","author" : "J. R. R. Tolkien","title" : "The Lord of the Rings","isbn" : "0-395-19395-8","price" : 22.99} //! ]); //! assert_eq!(ret, json); //! //! // //! // $.store.book[?(@.price < 10)] //! // //! let json = selector("$.store.book[?(@.price < 10)]").unwrap(); //! let ret = json!([ //! {"category" : "reference","author" : "Nigel Rees","title" : "Sayings of the Century","price" : 8.95}, //! {"category" : "fiction","author" : "Herman Melville","title" : "Moby Dick","isbn" : "0-553-21311-3","price" : 8.99} //! ]); //! assert_eq!(ret, json); //! ``` #[macro_use] extern crate log; extern crate env_logger; extern crate serde_json; extern crate indexmap; #[doc(hidden)] mod parser; #[doc(hidden)] mod filter; #[doc(hidden)] mod ref_value; pub mod prelude; use parser::prelude::*; use filter::prelude::*; use std::result; use serde_json::Value; use ref_value::*; type Result = result::Result<Value, String>; /// # Read multiple Json multiple times with the same JsonPath /// /// ```rust /// extern crate jsonpath_lib as jsonpath; /// #[macro_use] extern crate serde_json; /// /// let mut template = jsonpath::compile("$..friends[0]"); /// /// /// let json_obj = json!({ /// "school": { /// "friends": [ {"id": 0}, {"id": 1} ] /// }, /// "friends": [ {"id": 0}, {"id": 1} ] /// }); /// /// let json = template(&json_obj).unwrap(); /// let ret = json!([ {"id": 0}, {"id": 0} ]); /// assert_eq!(json, ret); /// /// /// let json_obj = json!({ /// "school": { /// "friends": [ {"name": "Millicent Norman"}, {"name": "Vincent Cannon"} ] /// }, /// "friends": [ {"id": 0}, {"id": 1} ] /// }); /// /// let json = template(&json_obj).unwrap(); /// let ret = json!([ {"id": 0}, {"name": "Millicent Norman"} ]); /// assert_eq!(json, ret); /// ``` pub fn compile<'a>(path: &'a str) -> impl FnMut(&Value) -> Result + 'a { let mut parser = Parser::new(path); let node = parser.compile(); move |json| { match &node { Ok(n) => { let mut jf = JsonValueFilter::new_from_value(json.into()); jf.visit(n.clone()); Ok(jf.take_value().into_value()) } Err(e) => Err(e.clone()) } } } /// # Read the same Json multiple times using different JsonPath /// /// ```rust /// extern crate jsonpath_lib as jsonpath; /// #[macro_use] extern crate serde_json; /// /// let json_obj = json!({ /// "school": { /// "friends": [{"id": 0}, {"id": 1}] /// }, /// "friends": [{"id": 0},{"id": 1}] /// }); /// /// let mut selector = jsonpath::selector(&json_obj); /// /// let json = selector("$..friends[0]").unwrap(); /// let ret = json!([ {"id": 0}, {"id": 0} ]); /// assert_eq!(json, ret); /// /// let json = selector("$..friends[1]").unwrap(); /// let ret = json!([ {"id": 1}, {"id": 1} ]); /// assert_eq!(json, ret); /// ``` pub fn selector(json: &Value) -> impl FnMut(&str) -> Result { let wrapper: RefValueWrapper = json.into(); move |path: &str| { let mut jf = JsonValueFilter::new_from_value(wrapper.clone()); let mut parser = Parser::new(path); parser.parse(&mut jf)?; Ok(jf.take_value().into_value()) } } /// # Read the same Json multiple times using different JsonPath - Deprecated. use selector pub fn reader(json: &Value) -> impl FnMut(&str) -> Result { selector(json) } /// # Read Json using JsonPath /// /// ```rust /// extern crate jsonpath_lib as jsonpath; /// #[macro_use] extern crate serde_json; /// /// let json_obj = json!({ /// "school": { /// "friends": [{"id": 0}, {"id": 1}] /// }, /// "friends": [{"id": 0}, {"id": 1}] /// }); /// let json = jsonpath::select(&json_obj, "$..friends[0]").unwrap(); /// let ret = json!([ {"id": 0}, {"id": 0} ]); /// assert_eq!(json, ret); /// ``` pub fn select(json: &Value, path: &str) -> Result { let mut jf = JsonValueFilter::new_from_value(json.into()); let mut parser = Parser::new(path); parser.parse(&mut jf)?; Ok(jf.take_value().into_value()) } /// # Read Json using JsonPath - Deprecated. use select pub fn read(json: &Value, path: &str) -> Result { select(json, path) }