spath 0.3.1

SPath is query expressions for semi-structured data. You can use it as a drop-in replacement for JSONPath, but also for other semi-structured data formats like TOML or user-defined variants.
Documentation 
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// Copyright 2024 tison <wander4096@gmail.com>
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

use serde_json::Map;
use serde_json::Number;
use serde_json::Value;

use crate::spec::function;
use crate::value::ConcreteVariantArray;
use crate::value::ConcreteVariantObject;
use crate::value::VariantValue;
use crate::FromLiteral;
use crate::Literal;

pub type BuiltinFunctionRegistry = function::BuiltinFunctionRegistry<Value>;

impl FromLiteral for Value {
    fn from_literal(literal: Literal) -> Option<Self> {
        match literal {
            Literal::Int(v) => Some(Value::Number(Number::from(v))),
            Literal::Float(v) => Number::from_f64(v).map(Value::Number),
            Literal::String(v) => Some(Value::String(v)),
            Literal::Bool(v) => Some(Value::Bool(v)),
            Literal::Null => Some(Value::Null),
        }
    }
}

impl VariantValue for Value {
    type VariantArray = Vec<Value>;
    type VariantObject = Map<String, Value>;

    fn is_null(&self) -> bool {
        self.is_null()
    }

    fn is_boolean(&self) -> bool {
        self.is_boolean()
    }

    fn is_string(&self) -> bool {
        self.is_string()
    }

    fn is_array(&self) -> bool {
        self.is_array()
    }

    fn is_object(&self) -> bool {
        self.is_object()
    }

    fn as_bool(&self) -> Option<bool> {
        self.as_bool()
    }

    fn as_str(&self) -> Option<&str> {
        self.as_str()
    }

    fn as_array(&self) -> Option<&Self::VariantArray> {
        self.as_array()
    }

    fn as_object(&self) -> Option<&Self::VariantObject> {
        self.as_object()
    }

    fn is_less_than(&self, other: &Self) -> bool {
        fn number_less_than(left: &Number, right: &Number) -> bool {
            if let (Some(l), Some(r)) = (left.as_i128(), right.as_i128()) {
                l < r
            } else if let (Some(l), Some(r)) = (left.as_f64(), right.as_f64()) {
                l < r
            } else {
                false
            }
        }

        match (self, other) {
            (Value::Number(n1), Value::Number(n2)) => number_less_than(n1, n2),
            (Value::String(s1), Value::String(s2)) => s1 < s2,
            _ => false,
        }
    }

    fn is_equal_to(&self, other: &Self) -> bool {
        fn number_equal_to(left: &Number, right: &Number) -> bool {
            if let (Some(l), Some(r)) = (left.as_i128(), right.as_i128()) {
                l == r
            } else if let (Some(l), Some(r)) = (left.as_f64(), right.as_f64()) {
                l == r
            } else {
                false
            }
        }

        match (self, other) {
            (Value::Number(a), Value::Number(b)) => number_equal_to(a, b),
            _ => self == other,
        }
    }
}

impl ConcreteVariantArray for Vec<Value> {
    type Value = Value;

    fn is_empty(&self) -> bool {
        self.is_empty()
    }

    fn len(&self) -> usize {
        (**self).len()
    }

    fn get(&self, index: usize) -> Option<&Self::Value> {
        (**self).get(index)
    }

    fn iter(&self) -> impl Iterator<Item = &Self::Value> {
        (**self).iter()
    }
}

impl ConcreteVariantObject for Map<String, Value> {
    type Value = Value;

    fn is_empty(&self) -> bool {
        self.is_empty()
    }

    fn len(&self) -> usize {
        self.len()
    }

    fn get(&self, key: &str) -> Option<&Self::Value> {
        self.get(key)
    }

    fn get_key_value(&self, key: &str) -> Option<(&String, &Self::Value)> {
        self.get_key_value(key)
    }

    fn iter(&self) -> impl Iterator<Item = (&String, &Self::Value)> {
        self.iter()
    }

    fn values(&self) -> impl Iterator<Item = &Self::Value> {
        self.values()
    }
}