command_parser: channel setup

This commit is contained in:
Astro 2019-09-13 01:04:59 +02:00
parent edb0401838
commit 3fd1b2265d
1 changed files with 33 additions and 2 deletions

View File

@ -28,6 +28,8 @@ enum Token {
Enable,
#[token = "disable"]
Disable,
#[token = "setup"]
Setup,
#[regex = "[0-9]+"]
Number,
@ -39,6 +41,7 @@ pub enum Error {
UnexpectedEnd,
UnexpectedToken(Token),
NoSuchChannel,
NoSuchSetup,
}
#[derive(Debug)]
@ -51,6 +54,7 @@ pub enum ShowCommand {
pub enum ChannelCommand {
Enable,
Disable,
Setup(u8),
}
#[derive(Debug)]
@ -64,11 +68,13 @@ pub enum Command {
const CHANNEL_IDS: &'static [&'static str] = &[
"0", "1", "2", "3",
];
const SETUP_IDS: &'static [&'static str] = CHANNEL_IDS;
impl Command {
pub fn parse(input: &str) -> Result<Self, Error> {
let mut lexer = Token::lexer(input);
/// Match against a set of expected tokens
macro_rules! choice {
[$($token: tt => $block: stmt,)*] => {
match lexer.token {
@ -81,14 +87,24 @@ impl Command {
Token::End => Err(Error::UnexpectedEnd),
_ => Err(Error::UnexpectedToken(lexer.token))
}
};
}
/// Expecting no further tokens
macro_rules! end {
($result: expr) => {
match lexer.token {
Token::End => Ok($result),
_ => Err(Error::UnexpectedToken(lexer.token)),
}
};
}
// Command grammar
choice![
Quit => Ok(Command::Quit),
Report => choice![
Mode => choice![
End => Ok(Command::Show(ShowCommand::ReportMode)),
End => end!(Command::Show(ShowCommand::ReportMode)),
Off => Ok(Command::Report(ReportMode::Off)),
Once => Ok(Command::Report(ReportMode::Once)),
Continuous => Ok(Command::Report(ReportMode::Continuous)),
@ -110,6 +126,21 @@ impl Command {
channel as u8,
ChannelCommand::Enable
)),
Setup => choice![
Number => {
let setup = SETUP_IDS.iter()
.position(|id| *id == lexer.slice());
match setup {
Some(setup) =>
end!(Command::Channel(
channel as u8,
ChannelCommand::Setup(setup as u8)
)),
None =>
Err(Error::NoSuchSetup)
}
},
],
]
}
None => Err(Error::NoSuchChannel)