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use crate::color::Color;
use crate::pointer_btn::PointerBtn;
use crate::text::Align;
use serde::Deserialize;
use serde::Serialize;
use serde_json::{Deserializer, Result as SerdeResult};
use std::io::{Error, ErrorKind, Result};
#[derive(Deserialize, Default)]
pub struct Block {
pub full_text: String,
#[serde(default)]
pub short_text: Option<String>,
#[serde(default)]
pub color: Option<Color>,
#[serde(default)]
pub background: Option<Color>,
#[serde(default)]
pub min_width: Option<MinWidth>,
#[serde(default)]
pub align: Option<Align>,
#[serde(default)]
pub name: Option<String>,
#[serde(default)]
pub instance: Option<String>,
#[serde(default = "def_sep")]
pub separator: bool,
#[serde(default = "def_sep_width")]
pub separator_block_width: u8,
#[serde(default)]
pub markup: Option<String>,
}
fn def_sep() -> bool {
true
}
fn def_sep_width() -> u8 {
9
}
#[derive(Deserialize, Clone)]
#[serde(untagged)]
pub enum MinWidth {
Text(String),
Pixels(u32),
}
#[derive(Serialize, Default)]
pub struct Event<'a> {
pub name: Option<&'a str>,
pub instance: Option<&'a str>,
pub button: PointerBtn,
// Not available on wayland
pub modifiers: Vec<()>,
// I see no reason to have these in the protocol, as a lot depends on font & pango markup
pub x: u8,
pub y: u8,
pub relative_x: u8,
pub relative_y: u8,
pub output_x: u8,
pub output_y: u8,
pub width: u8,
pub height: u8,
}
#[derive(Deserialize, Clone, Copy)]
#[serde(deny_unknown_fields)]
pub struct JsonHeader {
version: u8,
#[serde(default)]
#[allow(dead_code)]
stop_signal: i32,
#[serde(default)]
#[allow(dead_code)]
cont_signal: i32,
#[serde(default)]
click_events: bool,
}
pub enum Protocol {
Unknown,
PlainText(Option<String>),
JsonNotStarted(JsonHeader),
Json(JsonHeader, Option<Vec<Block>>, Option<String>),
}
impl Protocol {
pub fn process_line(&mut self, line: String) -> Result<()> {
macro_rules! invalid {
($fmt:expr) => {
return Err(Error::new(ErrorKind::InvalidData, format!($fmt)))
};
}
match self {
Self::Unknown => {
if let Ok(header) = serde_json::from_str::<JsonHeader>(&line) {
if header.version == 1 {
*self = Protocol::JsonNotStarted(header);
return Ok(());
}
}
*self = Self::PlainText(Some(line))
}
Self::PlainText(s) => *s = Some(line),
Self::JsonNotStarted(header) => {
let line = line.trim_start();
if !line.is_empty() {
if !line.starts_with('[') {
invalid!("Expected '['");
}
*self = Self::Json(*header, None, None);
self.process_line(line[1..].to_owned())?;
}
}
Self::Json(_, blocks, start_orig) => match start_orig {
Some(start) => {
start.push_str(&line);
match de_last::<Vec<Block>>(start) {
Err(e) => invalid!("Invalid JSON: {e}"),
Ok((rem, new_blocks)) => {
*start_orig = (!rem.is_empty()).then(|| rem.to_owned());
if let Some(new_blocks) = new_blocks {
*blocks = Some(new_blocks);
}
}
}
}
None => match de_last::<Vec<Block>>(&line) {
Err(e) => invalid!("Invalid JSON: {e}"),
Ok((rem, new_blocks)) => {
*start_orig = (!rem.is_empty()).then(|| rem.to_owned());
if let Some(new_blocks) = new_blocks {
*blocks = Some(new_blocks);
}
}
},
},
}
Ok(())
}
pub fn get_blocks(&mut self) -> Option<Vec<Block>> {
match self {
Self::Unknown => None,
Self::PlainText(text) => Some(vec![Block {
full_text: text.take()?,
..Default::default()
}]),
Self::JsonNotStarted(_) => None,
Self::Json(_, blocks, _) => blocks.take(),
}
}
pub fn supports_clicks(&self) -> bool {
match self {
Self::JsonNotStarted(h) => h.click_events,
Self::Json(h, _, _) => h.click_events,
_ => false,
}
}
}
/// Deserialize the last complete object. Returns (`remaining`, `object`). See tests for examples.
fn de_last<'a, T: Deserialize<'a>>(mut s: &'a str) -> SerdeResult<(&'a str, Option<T>)> {
let mut last = None;
let mut tmp;
loop {
(s, tmp) = de_once(s)?;
last = match tmp {
Some(obj) => Some(obj),
None => return Ok((s, last)),
};
}
}
/// Deserialize the first complete object. Returns (`remaining`, `object`).
fn de_once<'a, T: Deserialize<'a>>(s: &'a str) -> SerdeResult<(&'a str, Option<T>)> {
let s = s.trim_start_matches(|x: char| x.is_ascii_whitespace() || x == ',');
let mut de = Deserializer::from_str(s).into_iter();
match de.next() {
Some(Ok(obj)) => Ok((&s[de.byte_offset()..], Some(obj))),
Some(Err(e)) if e.is_eof() => Ok((&s[de.byte_offset()..], None)),
Some(Err(e)) => Err(e),
None => Ok((&s[de.byte_offset()..], None)),
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn streaming_json() {
let s = ",[2], [3], [4, 3],[32][3] ";
assert_eq!(de_last::<Vec<u8>>(s).unwrap(), ("", Some(vec![3])));
let s = ",[2], [3], [4, 3],[32][3] [2, 4";
assert_eq!(de_last::<Vec<u8>>(s).unwrap(), ("[2, 4", Some(vec![3])));
let s = ",[2], [3], [4, 3],[32] invalid";
assert!(de_last::<Vec<u8>>(s).is_err());
}
}
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