schala/src/main.rs
2021-10-31 03:30:45 -07:00

77 lines
2.5 KiB
Rust

use schala_repl::{Repl, ProgrammingLanguageInterface, ComputationRequest};
use std::{fs::File, io::Read, path::PathBuf, process::exit, collections::HashSet};
use schala_lang::{Schala, SchalaConfig};
//TODO specify multiple langs, and have a way to switch between them
fn main() {
let args: Vec<String> = std::env::args().collect();
let matches = command_line_options()
.parse(&args[1..])
.unwrap_or_else(|e| {
eprintln!("Error parsing options: {}", e);
exit(1);
});
if matches.opt_present("help") {
println!("{}", command_line_options().usage("Schala metainterpreter"));
exit(0);
}
if matches.free.is_empty() {
let state = Schala::new();
let mut repl = Repl::new(state);
let config = SchalaConfig { repl: true };
repl.run_repl(config);
} else {
let paths: Vec<PathBuf> = matches.free.iter().map(PathBuf::from).collect();
//TODO handle more than one file
let filename = &paths[0];
let extension = filename.extension().and_then(|e| e.to_str())
.unwrap_or_else(|| {
eprintln!("Source file `{}` has no extension.", filename.display());
exit(1);
});
//TODO this proably should be a macro for every supported language
if extension == Schala::source_file_suffix() {
let config = SchalaConfig {
repl: false,
};
run_noninteractive(paths, Schala::new(), config);
} else {
eprintln!("Extension .{} not recognized", extension);
exit(1);
}
}
}
pub fn run_noninteractive<L: ProgrammingLanguageInterface>(filenames: Vec<PathBuf>, mut language: L, config: L::Config) {
// for now, ony do something with the first filename
let filename = &filenames[0];
let mut source_file = File::open(filename).unwrap();
let mut buffer = String::new();
source_file.read_to_string(&mut buffer).unwrap();
let request = ComputationRequest {
source: &buffer,
config,
debug_requests: HashSet::new(),
};
let response = language.run_computation(request);
match response.main_output {
Ok(s) => println!("{}", s),
Err(s) => eprintln!("{}", s),
};
}
fn command_line_options() -> getopts::Options {
let mut options = getopts::Options::new();
options.optflag("h", "help", "Show help text");
//options.optflag("w", "webapp", "Start up web interpreter");
options
}