Rust JSON Simple Filter Library

This library provides functionality to apply a series of filters to JSON data structures in Rust. The filters are defined by a string and parsed into a series of Filter structs, which can then be applied to any JSON data structure.

Features

• Define filters using simple string syntax.
• Apply multiple filters to JSON data.
• Filters can use string comparison, numeric comparison, or both.
• Optionally use multipliers for numeric comparisons.

Usage

Defining Filters

Filters are defined as a string with a simple syntax:

.field = 'value' AND .other_field >= 10

Each part of the string is separated by " AND " to define multiple filters.

In each filter:

• The field to be filtered is prefixed with a dot (.).
• The operator can be one of: =, !=, >, <, >=, <=.
• The value to be compared can be a string (surrounded by ') or a number.

Parsing Filters

Use the parse function to parse a filter string into a list of Filter structs:

let filters = parse(filter_string).unwrap();

Applying Filters

Use the apply function to apply a list of Filter structs to a JSON data structure:

let v = json!({ "field": "hello", "value": 20 });
let result = apply(&v, &filters);

This returns true if the data passes all filters, and false otherwise.

Example

use serde_json::json;
use json_filter::{parse, apply};

let filter_string = ".field = 'hello' AND .value >= 20";
let filters = parse(filter_string).unwrap();

let v = json!({ "field": "hello", "value": 30 });
assert!(apply(&v, &filters));

let v = json!({ "field": "world", "value": 30 });
assert!(!apply(&v, &filters));

Testing

The library includes a test suite to validate the functionality. Run the tests with cargo test.