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use crate::parser::{parse, ParseError};
use serde_json::Value;
use std::fmt::{Display, Formatter};
use std::fmt::Result as FmtResult;
use std::fmt::Write;
use std::marker::PhantomData;
use std::ops::{Index, IndexMut};
use std::str::FromStr;
#[derive(Clone, Debug, Eq, PartialEq)]
pub struct JsonPointer<S: AsRef<str>, C: AsRef<[S]>> {
ref_toks: C,
_phantom: PhantomData<S>,
}
impl<S: AsRef<str>, C: AsRef<[S]>> JsonPointer<S, C> {
pub fn new(ref_toks: C) -> JsonPointer<S, C> {
JsonPointer {
ref_toks: ref_toks,
_phantom: PhantomData,
}
}
pub fn get<'json>(&self, val: &'json Value) -> Result<&'json Value, IndexError> {
self.ref_toks.as_ref().iter().fold(Ok(val), |val, tok| val.and_then(|val| {
let tok = tok.as_ref();
match *val {
Value::Object(ref obj) => obj.get(tok).ok_or_else(|| IndexError::NoSuchKey(tok.to_owned())),
Value::Array(ref arr) => {
let idx = if tok == "-" {
arr.len()
} else if let Ok(idx) = tok.parse() {
idx
} else {
return Err(IndexError::NoSuchKey(tok.to_owned()));
};
arr.get(idx).ok_or(IndexError::OutOfBounds(idx))
},
_ => Err(IndexError::NotIndexable),
}
}))
}
pub fn get_mut<'json>(&self, val: &'json mut Value) -> Result<&'json mut Value, IndexError> {
self.ref_toks.as_ref().iter().fold(Ok(val), |val, tok| val.and_then(|val| {
let tok = tok.as_ref();
match *val {
Value::Object(ref mut obj) => obj.get_mut(tok).ok_or_else(|| IndexError::NoSuchKey(tok.to_owned())),
Value::Array(ref mut arr) => {
let idx = if tok == "-" {
arr.len()
} else if let Ok(idx) = tok.parse() {
idx
} else {
return Err(IndexError::NoSuchKey(tok.to_owned()));
};
arr.get_mut(idx).ok_or(IndexError::OutOfBounds(idx))
},
_ => Err(IndexError::NotIndexable),
}
}))
}
pub fn get_owned(&self, val: Value) -> Result<Value, IndexError> {
self.ref_toks.as_ref().iter().fold(Ok(val), |val, tok| val.and_then(|val| {
let tok = tok.as_ref();
match val {
Value::Object(mut obj) => obj.remove(tok).ok_or_else(|| IndexError::NoSuchKey(tok.to_owned())),
Value::Array(mut arr) => {
let idx = if tok == "-" {
arr.len()
} else if let Ok(idx) = tok.parse() {
idx
} else {
return Err(IndexError::NoSuchKey(tok.to_owned()));
};
if idx >= arr.len() {
Err(IndexError::OutOfBounds(idx))
} else {
Ok(arr.swap_remove(idx))
}
},
_ => Err(IndexError::NotIndexable),
}
}))
}
pub fn uri_fragment(&self) -> String {
fn legal_fragment_byte(b: u8) -> bool {
match b {
0x21 | 0x24 | 0x26..=0x3b | 0x3d | 0x3f..=0x5a | 0x5f | 0x61..=0x7a => true,
_ => false,
}
}
let mut s = "#".to_string();
for part in self.ref_toks.as_ref().iter() {
s += "/";
for b in part.as_ref().bytes() {
if legal_fragment_byte(b) {
s.push(b as char)
} else {
write!(s, "%{:02x}", b).unwrap()
}
}
}
s
}
}
impl<S: AsRef<str>> JsonPointer<S, Vec<S>> {
pub fn push(&mut self, component: S) {
self.ref_toks.push(component);
}
pub fn pop(&mut self) -> Option<S> {
self.ref_toks.pop()
}
}
impl<S: AsRef<str>, C: AsRef<[S]>> Display for JsonPointer<S, C> {
fn fmt(&self, fmt: &mut Formatter) -> FmtResult {
for part in self.ref_toks.as_ref().iter() {
write!(fmt, "/")?;
for ch in part.as_ref().chars() {
match ch {
'~' => write!(fmt, "~0"),
'/' => write!(fmt, "~1"),
c => write!(fmt, "{}", c),
}?
}
}
Ok(())
}
}
impl FromStr for JsonPointer<String, Vec<String>> {
type Err = ParseError;
fn from_str(s: &str) -> Result<Self, Self::Err> {
parse(s)
}
}
#[derive(Clone, Debug, PartialEq)]
pub enum IndexError {
NoSuchKey(String),
NotIndexable,
OutOfBounds(usize),
}
impl<'a, S: AsRef<str>, C: AsRef<[S]>> Index<&'a JsonPointer<S, C>> for Value {
type Output = Value;
fn index(&self, ptr: &'a JsonPointer<S, C>) -> &Value {
ptr.get(self).unwrap()
}
}
impl<'a, S: AsRef<str>, C: AsRef<[S]>> IndexMut<&'a JsonPointer<S, C>> for Value {
fn index_mut(&mut self, ptr: &'a JsonPointer<S, C>) -> &mut Value {
ptr.get_mut(self).unwrap()
}
}