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//! cassiopeia file format
mod gen;
pub(crate) mod ir;
mod lexer;
mod parser;
pub(crate) use lexer::{LineLexer, LineToken, Token};
pub(crate) use parser::LineCfg;
use crate::TimeFile;
use ir::{IrItem, IrStream};
use std::{
fs::{File, OpenOptions},
io::{Read, Write},
};
#[derive(Default)]
pub(crate) struct ParseOutput {
pub(crate) ir: IrStream,
pub(crate) tf: TimeFile,
}
impl ParseOutput {
fn append(mut self, ir: IrItem) -> Self {
self.tf.append(ir.clone());
self.ir.push(ir);
self
}
}
/// Load a file from disk and parse it into a
/// [`TimeFile`](crate::TimeFile)
pub(crate) fn load_file(path: &str) -> Option<ParseOutput> {
let mut f = File::open(path).ok()?;
let mut content = String::new();
f.read_to_string(&mut content).ok()?;
let mut lines: Vec<String> = content.split("\n").map(|l| l.to_owned()).collect();
Some(
ir::generate_ir(
lines
.iter_mut()
.map(|line| lexer::lex(line))
.map(|lex| parser::parse(lex)),
)
.into_iter()
.fold(ParseOutput::default(), |output, ir| output.append(ir)),
)
}
/// Write a file with the updated IR stream
pub(crate) fn write_file(path: &str, ir: &mut IrStream) -> Option<()> {
ir::update_header(ir);
let mut lines = ir.into_iter().map(|ir| gen::line(ir)).collect::<Vec<_>>();
lines.insert(0, gen::head_comment());
let mut f = OpenOptions::new()
.write(true)
.create(true)
.truncate(true)
.open(path)
.ok()?;
f.write_all(lines.join("\n").as_bytes()).ok()?;
Some(())
}
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