From e785fc9cba73d897b33289ba337fccb70c639d9d Mon Sep 17 00:00:00 2001
From: Boris Zhguchev <zhguchev@hotmail.com>
Date: Sun, 6 Apr 2025 21:25:29 +0200
Subject: [PATCH 1/2]  fix #92

---
 src/lib.rs           |  1 +
 src/parser.rs        |  2 +-
 src/parser/errors.rs |  2 +-
 src/query.rs         | 41 +++++++++++++++++++++++++++++++++++++----
 4 files changed, 40 insertions(+), 6 deletions(-)

diff --git a/src/lib.rs b/src/lib.rs
index ba96322..e73802f 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -113,6 +113,7 @@ pub trait JsonPath: Queryable {
     fn query(&self, path: &str) -> Queried<Vec<&Self>> {
         query::js_path_vals(path, self)
     }
+
 }
 
 impl JsonPath for Value {}
diff --git a/src/parser.rs b/src/parser.rs
index add5276..6f8d188 100644
--- a/src/parser.rs
+++ b/src/parser.rs
@@ -19,7 +19,7 @@ pub(super) struct JSPathParser;
 const MAX_VAL: i64 = 9007199254740991; // Maximum safe integer value in JavaScript
 const MIN_VAL: i64 = -9007199254740991; // Minimum safe integer value in JavaScript
 
-pub(super) type Parsed<T> = Result<T, JsonPathError>;
+pub type Parsed<T> = Result<T, JsonPathError>;
 
 /// Parses a string into a [JsonPath].
 ///
diff --git a/src/parser/errors.rs b/src/parser/errors.rs
index 43f4b7c..c7fd563 100644
--- a/src/parser/errors.rs
+++ b/src/parser/errors.rs
@@ -6,7 +6,7 @@ use std::str::ParseBoolError;
 use thiserror::Error;
 
 /// This error type is used to represent errors that can occur during the parsing of JSONPath expressions.
-#[derive(Error, Debug, PartialEq)]
+#[derive(Error, Debug, PartialEq, Clone)]
 pub enum JsonPathError {
     #[error("Failed to parse rule: {0}")]
     PestError(#[from] Box<pest::error::Error<Rule>>),
diff --git a/src/query.rs b/src/query.rs
index 498cb1b..887496c 100644
--- a/src/query.rs
+++ b/src/query.rs
@@ -11,7 +11,8 @@ mod test;
 mod test_function;
 
 use crate::parser::errors::JsonPathError;
-use crate::parser::parse_json_path;
+use crate::parser::model::JpQuery;
+use crate::parser::{parse_json_path, Parsed};
 use crate::query::queryable::Queryable;
 use crate::query::state::{Data, Pointer};
 use state::State;
@@ -62,7 +63,16 @@ impl<'a, T: Queryable> From<Pointer<'a, T>> for QueryRef<'a, T> {
 /// The main function to process a JSONPath query.
 /// It takes a path and a value, and returns a vector of `QueryResult` thus values + paths.
 pub fn js_path<'a, T: Queryable>(path: &str, value: &'a T) -> Queried<Vec<QueryRef<'a, T>>> {
-    match parse_json_path(path)?.process(State::root(value)).data {
+    js_path_process(&parse_json_path(path)?, value)
+}
+
+/// A convenience function to process a JSONPath query
+/// and return a vector of values, omitting the path.
+pub fn js_path_process<'a, 'b, T: Queryable>(
+    path: &'b JpQuery,
+    value: &'a T,
+) -> Queried<Vec<QueryRef<'a, T>>> {
+    match path.process(State::root(value)).data {
         Data::Ref(p) => Ok(vec![p.into()]),
         Data::Refs(refs) => Ok(refs.into_iter().map(Into::into).collect()),
         Data::Value(v) => Err(v.into()),
@@ -89,9 +99,9 @@ pub fn js_path_path<T: Queryable>(path: &str, value: &T) -> Queried<Vec<QueryPat
 #[cfg(test)]
 mod tests {
     use crate::parser::errors::JsonPathError;
-    use crate::parser::Parsed;
+    use crate::parser::{parse_json_path, Parsed};
     use crate::query::queryable::Queryable;
-    use crate::query::{js_path, Queried, QueryRef};
+    use crate::query::{js_path, js_path_process, Queried, QueryRef};
     use crate::JsonPath;
     use serde_json::{json, Value};
 
@@ -807,4 +817,27 @@ mod tests {
 
         Ok(())
     }
+
+    #[test]
+    fn prepared_query() -> Queried<()> {
+        let json1 = json!({
+          "a": 1,
+          "b": 2,
+          "c": 3
+        });
+        let json2 = json!({
+          "a": 1,
+          "b": 2,
+          "c": 3
+        });
+
+        let jq = parse_json_path("$[?@<3]")?;
+
+        let v1 = js_path_process(&jq, &json1)?;
+        let v2 = js_path_process(&jq, &json2)?;
+
+        assert_eq!(v1, v2);
+
+        Ok(())
+    }
 }

From da0027adc17b64aeb8dd6ca2f13cd562a0bbb03f Mon Sep 17 00:00:00 2001
From: Boris Zhguchev <zhguchev@hotmail.com>
Date: Sun, 6 Apr 2025 21:27:21 +0200
Subject: [PATCH 2/2] fix linter

---
 src/lib.rs | 1 -
 1 file changed, 1 deletion(-)

diff --git a/src/lib.rs b/src/lib.rs
index e73802f..ba96322 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -113,7 +113,6 @@ pub trait JsonPath: Queryable {
     fn query(&self, path: &str) -> Queried<Vec<&Self>> {
         query::js_path_vals(path, self)
     }
-
 }
 
 impl JsonPath for Value {}