forked from apache/arrow-rs
/
mod.rs
82 lines (72 loc) · 2.66 KB
/
mod.rs
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// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you 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.
//! Transfer data between the Arrow memory format and JSON
//! line-delimited records. See the module level documentation for the
//! [`reader`] and [`writer`] for usage examples.
pub mod reader;
pub mod writer;
pub use self::reader::Reader;
pub use self::reader::ReaderBuilder;
pub use self::writer::{ArrayWriter, LineDelimitedWriter, Writer};
use half::f16;
use serde_json::{Number, Value};
/// Trait declaring any type that is serializable to JSON. This includes all primitive types (bool, i32, etc.).
pub trait JsonSerializable: 'static {
fn into_json_value(self) -> Option<Value>;
}
macro_rules! json_serializable {
($t:ty) => {
impl JsonSerializable for $t {
fn into_json_value(self) -> Option<Value> {
Some(self.into())
}
}
};
}
json_serializable!(bool);
json_serializable!(u8);
json_serializable!(u16);
json_serializable!(u32);
json_serializable!(u64);
json_serializable!(i8);
json_serializable!(i16);
json_serializable!(i32);
json_serializable!(i64);
impl JsonSerializable for i128 {
fn into_json_value(self) -> Option<Value> {
// Serialize as string to avoid issues with arbitrary_precision serde_json feature
// - https://github.com/serde-rs/json/issues/559
// - https://github.com/serde-rs/json/issues/845
// - https://github.com/serde-rs/json/issues/846
Some(self.to_string().into())
}
}
impl JsonSerializable for f16 {
fn into_json_value(self) -> Option<Value> {
Number::from_f64(f64::round(f64::from(self) * 1000.0) / 1000.0).map(Value::Number)
}
}
impl JsonSerializable for f32 {
fn into_json_value(self) -> Option<Value> {
Number::from_f64(f64::round(self as f64 * 1000.0) / 1000.0).map(Value::Number)
}
}
impl JsonSerializable for f64 {
fn into_json_value(self) -> Option<Value> {
Number::from_f64(self).map(Value::Number)
}
}