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use serde::{Deserialize, Serialize};
use std::convert::TryInto;
use crate::error::*;
use crate::tokenizer::tokenize_with_seperator;
use crate::object::*;
use crate::tokenizer::Token;
use crate::query::Query;
pub trait Read<'doc> : Object<'doc> + Sized {
fn read(&'doc self, query: &Query) -> Result<Option<&'doc Self>> {
query_with_token(self, query.token())
}
}
#[cfg(feature = "backend_toml")]
impl<'doc> Read<'doc> for toml::Value { }
#[cfg(feature = "backend_serde_json")]
impl<'doc> Read<'doc> for serde_json::Value { }
fn query_with_token<'doc, O>(obj: &'doc O, token: &Token) -> Result<Option<&'doc O>>
where O: Object<'doc>
{
match token {
Token::Identifier{ ident, .. } => {
let object = obj.at_key(ident)?;
if let Some(object) = object {
if let Some(next_token) = token.next() {
query_with_token(object, next_token)
} else {
Ok(Some(object))
}
} else {
Ok(None)
}
}
Token::Index { idx, .. } => {
let object = obj.at_index(*idx)?;
if let Some(object) = object {
if let Some(next_token) = token.next() {
query_with_token(object, next_token)
} else {
Ok(Some(object))
}
} else {
Ok(None)
}
}
}
}
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