jsxn 0.1.1

Put JSX in your JSON and JSON in your JSX!
Documentation 
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use crate::{
    jsx::{root as jsx_value, JsxValue},
    shared::sp,
};
use nom::{
    branch::alt,
    bytes::complete::{escaped, is_not, tag},
    character::complete::{char, hex_digit1, one_of},
    combinator::{cut, map, opt, value, verify},
    error::{context, ParseError},
    multi::separated_list,
    number::complete::double,
    sequence::{delimited, preceded, separated_pair, terminated},
    IResult,
};
use serde::{Serialize, Serializer};
use std::{collections::BTreeMap, str};

/// A JSON value
#[derive(Debug, PartialEq, Clone)]
pub enum JsonValue {
    /// A JSON string
    Str(String),

    /// A JSON boolean
    Boolean(bool),

    /// A JSON number
    Num(f64),

    /// A JSON array
    Array(Vec<JsonValue>),

    /// A JSON object
    Object(BTreeMap<String, JsonValue>),

    /// A JSON null value
    Null,

    /// A JSX value
    JsxValue(Box<JsxValue>),
}

impl Serialize for JsonValue {
    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
    where
        S: Serializer,
    {
        match self {
            JsonValue::Str(json_str) => json_str.serialize(serializer),
            JsonValue::Boolean(json_boolean) => json_boolean.serialize(serializer),
            JsonValue::Num(json_num) => json_num.serialize(serializer),
            JsonValue::Array(json_array) => json_array.serialize(serializer),
            JsonValue::Object(json_object) => json_object.serialize(serializer),
            JsonValue::Null => serializer.serialize_none(),
            JsonValue::JsxValue(jsx_value) => jsx_value.serialize(serializer),
        }
    }
}

fn json_boolean<'a, E: ParseError<&'a str>>(i: &'a str) -> IResult<&'a str, bool, E> {
    let parse_true = value(true, tag("true"));
    let parse_false = value(false, tag("false"));
    context("json boolean", alt((parse_true, parse_false)))(i)
}

fn json_unicode_sequence<'a, E: ParseError<&'a str>>(i: &'a str) -> IResult<&'a str, &'a str, E> {
    context(
        "json unicode sequence",
        verify(preceded(char('u'), hex_digit1), |hex_digits: &str| {
            hex_digits.len() == 4
        }),
    )(i)
}

pub(crate) fn json_string<'a, E: ParseError<&'a str>>(i: &'a str) -> IResult<&'a str, String, E> {
    context(
        "json string",
        map(
            alt((
                value("", tag("\"\"")),
                delimited(
                    char('\"'),
                    escaped(
                        is_not("\\\""),
                        '\\',
                        alt((
                            map(one_of("\"\\/bfnrt"), |_| ()),
                            map(json_unicode_sequence, |_| ()),
                        )),
                    ),
                    char('\"'),
                ),
            )),
            String::from,
        ),
    )(i)
}

fn json_array<'a, E: ParseError<&'a str>>(i: &'a str) -> IResult<&'a str, Vec<JsonValue>, E> {
    context(
        "json array",
        preceded(
            char('['),
            cut(terminated(
                separated_list(preceded(sp, char(',')), json_value),
                preceded(sp, char(']')),
            )),
        ),
    )(i)
}

fn json_key_value<'a, E: ParseError<&'a str>>(
    i: &'a str,
) -> IResult<&'a str, (String, JsonValue), E> {
    context(
        "json key value",
        separated_pair(
            preceded(sp, json_string),
            cut(preceded(sp, char(':'))),
            json_value,
        ),
    )(i)
}

fn json_object<'a, E: ParseError<&'a str>>(
    i: &'a str,
) -> IResult<&'a str, BTreeMap<String, JsonValue>, E> {
    context(
        "json object",
        preceded(
            char('{'),
            cut(terminated(
                map(
                    separated_list(preceded(sp, char(',')), json_key_value),
                    |tuple_vec| tuple_vec.into_iter().collect(),
                ),
                preceded(sp, char('}')),
            )),
        ),
    )(i)
}

pub(crate) fn json_value<'a, E: ParseError<&'a str>>(i: &'a str) -> IResult<&'a str, JsonValue, E> {
    preceded(
        sp,
        alt((
            map(json_object, JsonValue::Object),
            map(json_array, JsonValue::Array),
            map(json_string, JsonValue::Str),
            map(double, JsonValue::Num),
            map(json_boolean, JsonValue::Boolean),
            map(tag("null"), |_| JsonValue::Null),
            map(jsx_value, |jsx| JsonValue::JsxValue(Box::new(jsx))),
        )),
    )(i)
}

/// The root JSON object or array of a JSON tree
pub fn root<'a, E: ParseError<&'a str>>(i: &'a str) -> IResult<&'a str, JsonValue, E> {
    delimited(
        sp,
        alt((
            map(json_object, JsonValue::Object),
            map(json_array, JsonValue::Array),
        )),
        opt(sp),
    )(i)
}