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use std::borrow::Cow;
use std::collections::BTreeMap;
use serde::ser::Serialize;
use serde_json::value::{to_value, Map, Value};
#[derive(Debug, Clone, PartialEq)]
pub struct Context {
data: BTreeMap<String, Value>,
}
impl Context {
pub fn new() -> Context {
Context { data: BTreeMap::new() }
}
pub fn insert<T: Serialize + ?Sized>(&mut self, key: &str, val: &T) {
self.data.insert(key.to_owned(), to_value(val).unwrap());
}
pub fn extend(&mut self, mut source: Context) {
self.data.append(&mut source.data);
}
pub fn into_json(self) -> Value {
let mut m = Map::new();
for (key, value) in self.data {
m.insert(key, value);
}
Value::Object(m)
}
}
impl Default for Context {
fn default() -> Context {
Context::new()
}
}
pub trait ValueRender {
fn render(&self) -> Cow<str>;
}
impl ValueRender for Value {
fn render(&self) -> Cow<str> {
match *self {
Value::String(ref s) => Cow::Borrowed(s),
Value::Number(ref i) => Cow::Owned(i.to_string()),
Value::Bool(i) => Cow::Owned(i.to_string()),
Value::Null => Cow::Owned(String::new()),
Value::Array(ref a) => {
let mut buf = String::new();
buf.push('[');
for i in a.iter() {
if buf.len() > 1 {
buf.push_str(", ");
}
buf.push_str(i.render().as_ref());
}
buf.push(']');
Cow::Owned(buf)
}
Value::Object(_) => Cow::Owned("[object]".to_owned()),
}
}
}
pub trait ValueNumber {
fn to_number(&self) -> Result<f64, ()>;
}
impl ValueNumber for Value {
fn to_number(&self) -> Result<f64, ()> {
match *self {
Value::Number(ref i) => Ok(i.as_f64().unwrap()),
_ => Err(()),
}
}
}
pub trait ValueTruthy {
fn is_truthy(&self) -> bool;
}
impl ValueTruthy for Value {
fn is_truthy(&self) -> bool {
match *self {
Value::Number(ref i) => {
if i.is_i64() {
return i.as_i64().unwrap() != 0;
}
if i.is_u64() {
return i.as_u64().unwrap() != 0;
}
let f = i.as_f64().unwrap();
f != 0.0 && !f.is_nan()
}
Value::Bool(ref i) => *i,
Value::Null => false,
Value::String(ref i) => !i.is_empty(),
Value::Array(ref i) => !i.is_empty(),
Value::Object(ref i) => !i.is_empty(),
}
}
}
#[inline]
pub fn get_json_pointer(key: &str) -> String {
["/", &key.replace(".", "/")].join("")
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_extend() {
let mut target = Context::new();
target.insert("a", &1);
target.insert("b", &2);
let mut source = Context::new();
source.insert("b", &3);
source.insert("c", &4);
target.extend(source);
assert_eq!(*target.data.get("a").unwrap(), to_value(1).unwrap());
assert_eq!(*target.data.get("b").unwrap(), to_value(3).unwrap());
assert_eq!(*target.data.get("c").unwrap(), to_value(4).unwrap());
}
}