schala/src/main.rs

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Rust
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#![feature(advanced_slice_patterns, slice_patterns, box_patterns)]
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extern crate getopts;
extern crate linefeed;
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use std::path::Path;
use std::fs::File;
use std::io::Read;
use std::process;
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use tokenizer::tokenize;
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mod tokenizer;
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use parser::parse;
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mod parser;
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use eval::Evaluator;
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mod eval;
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use language::{ProgrammingLanguage, ParseError, TokenError};
mod language;
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use compilation::{compilation_sequence, compile_ast};
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mod compilation;
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mod llvm_wrap;
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fn main() {
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let option_matches =
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match program_options().parse(std::env::args()) {
Ok(o) => o,
Err(e) => {
println!("{:?}", e);
std::process::exit(1);
}
};
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let trace = option_matches.opt_present("t");
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let show_llvm = option_matches.opt_present("l");
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match option_matches.free[..] {
[] | [_] => {
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let mut repl = Repl::new(trace, show_llvm);
repl.run();
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}
[_, ref filename, _..] => {
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run_noninteractive(filename, !option_matches.opt_present("i"), trace);
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}
};
}
fn program_options() -> getopts::Options {
let mut options = getopts::Options::new();
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options.optflag("i",
"interpret",
"Interpret source file instead of compiling");
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options.optflag("t",
"trace-evaluation",
"Print out trace of evaluation");
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options.optflag("l",
"llvm-in-repl",
"Show LLVM IR in REPL");
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options
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}
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fn run_noninteractive(filename: &str, compile: bool, trace_evaluation: bool) {
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let mut source_file = File::open(&Path::new(filename)).unwrap();
let mut buffer = String::new();
source_file.read_to_string(&mut buffer).unwrap();
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let tokens = match tokenize(&buffer) {
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Ok(t) => t,
Err(e) => {
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println!("Tokenization error: {}", e.msg);
std::process::exit(1)
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}
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};
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let ast = match parse(&tokens, &[]) {
Ok(ast) => ast,
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Err(err) => {
println!("Parse error: {:?}", err.msg);
println!("Remaining tokens: {:?}", err.remaining_tokens);
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std::process::exit(1)
}
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};
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if compile {
compilation_sequence(ast, filename);
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} else {
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let mut evaluator = Evaluator::new_with_opts(None, trace_evaluation);
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let results = evaluator.run(ast);
for result in results.iter() {
println!("{}", result);
}
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}
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}
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type LineReader = linefeed::Reader<linefeed::terminal::DefaultTerminal>;
struct Repl<'a> {
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show_tokens: bool,
show_parse: bool,
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show_llvm_ir: bool,
evaluator: Evaluator<'a>,
interpreter_directive_sigil: char,
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reader: LineReader,
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}
impl<'a> Repl<'a> {
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fn new(trace_evaluation: bool, show_llvm: bool) -> Repl<'a> {
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let mut reader: linefeed::Reader<_> = linefeed::Reader::new("Schala").unwrap();
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reader.set_prompt(">> ");
Repl {
show_tokens: false,
show_parse: false,
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show_llvm_ir: show_llvm,
evaluator: Evaluator::new_with_opts(None, trace_evaluation),
interpreter_directive_sigil: '.',
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reader: reader,
}
}
fn run(&mut self) {
use linefeed::ReadResult::*;
println!("Schala v 0.02");
loop {
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match self.reader.read_line() {
Err(e) => {
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println!("Terminal read error: {}", e);
},
Ok(Eof) => {
break;
}
Ok(Input(ref input)) => {
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self.reader.add_history(input.clone());
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if self.handle_interpreter_directive(input) {
continue;
}
let output = self.input_handler(input);
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println!("=> {}", output);
}
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_ => (),
}
}
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println!("Exiting...");
}
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fn new_input_handler(input: &str) -> String {
let language = Schala {};
unimplemented!()
}
fn input_handler(&mut self, input: &str) -> String {
let schala = Schala { };
self.input_handler_new(input, schala)
}
fn input_handler_new<T: ProgrammingLanguage<eval::Evaluator<'a>>>(&mut self, input: &str, language: T) -> String {
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let mut output = String::new();
let tokens = match T::tokenize(input) {
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Ok(tokens) => tokens,
Err(err) => {
output.push_str(&format!("Tokenization error: {}\n", err.msg));
return output;
}
};
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if self.show_tokens {
output.push_str(&format!("Tokens: {:?}\n", tokens));
}
let ast = match T::parse(tokens) {
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Ok(ast) => ast,
Err(err) => {
output.push_str(&format!("Parse error: {:?}\n", err.msg));
return output;
}
};
if self.show_parse {
output.push_str(&format!("AST: {:?}\n", ast));
}
/*
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if self.show_llvm_ir {
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let s = compile_ast(ast);
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output.push_str(&s);
*/
if false {
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} else {
// for now only handle last output
let mut full_output: Vec<String> = T::evaluate(ast, &mut self.evaluator);
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output.push_str(&full_output.pop().unwrap_or("".to_string()));
}
output
}
fn handle_interpreter_directive(&mut self, input: &str) -> bool {
match input.chars().nth(0) {
Some(ch) if ch == self.interpreter_directive_sigil => (),
_ => return false
}
let mut iter = input.chars();
iter.next();
let trimmed_sigil: &str = iter.as_str();
let commands: Vec<&str> = trimmed_sigil
.split_whitespace()
.collect();
let cmd: &str = match commands.get(0).clone() {
None => return true,
Some(s) => s
};
match cmd {
"exit" | "quit" => process::exit(0),
"history" => {
for item in self.reader.history() {
println!("{}", item);
}
},
"set" => {
let show = match commands[1] {
"show" => true,
"hide" => false,
e => {
println!("Bad `set` argument: {}", e);
return true;
}
};
match commands[2] {
"tokens" => self.show_tokens = show,
"parse" => self.show_parse = show,
"eval" => self.evaluator.trace_evaluation = show,
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"llvm" => self.show_llvm_ir = show,
e => {
println!("Bad `show`/`hide` argument: {}", e);
return true;
}
}
},
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e => println!("Unknown command: {}", e)
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}
return true;
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}
}
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struct Schala { }
impl<'a> ProgrammingLanguage<eval::Evaluator<'a>> for Schala {
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type Token = tokenizer::Token;
type AST = parser::AST;
fn tokenize(input: &str) -> Result<Vec<Self::Token>, TokenError> {
tokenizer::tokenize(input).map_err(|x| TokenError { msg: x.msg })
}
fn parse(input: Vec<Self::Token>) -> Result<Self::AST, ParseError> {
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parser::parse(&input, &[]).map_err(|x| ParseError { msg: x.msg })
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}
fn evaluate(input: Self::AST, evaluator: &mut Evaluator) -> Vec<String> {
evaluator.run(input)
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}
fn compile(input: &Self::AST) {
unimplemented!()
}
}