schala/schala-repl/src/lib.rs

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#![feature(link_args)]
#![feature(advanced_slice_patterns, slice_patterns, box_patterns, box_syntax)]
#![feature(plugin)]
#![plugin(rocket_codegen)]
extern crate getopts;
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extern crate rustyline;
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extern crate itertools;
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#[macro_use]
extern crate lazy_static;
#[macro_use]
extern crate maplit;
#[macro_use]
extern crate serde_derive;
extern crate serde_json;
extern crate rocket;
extern crate rocket_contrib;
extern crate includedir;
extern crate phf;
use std::path::Path;
use std::fs::File;
use std::io::{Read, Write};
use std::process::exit;
use std::default::Default;
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use rustyline::error::ReadlineError;
use rustyline::Editor;
mod language;
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mod webapp;
pub mod llvm_wrap;
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const VERSION_STRING: &'static str = "0.1.0";
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include!(concat!(env!("OUT_DIR"), "/static.rs"));
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pub use language::{LLVMCodeString, ProgrammingLanguageInterface, EvalOptions, ExecutionMethod, TraceArtifact, LanguageOutput, FinishedComputation, UnfinishedComputation};
pub type PLIGenerator = Box<Fn() -> Box<ProgrammingLanguageInterface> + Send + Sync>;
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pub fn repl_main(generators: Vec<PLIGenerator>) {
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let languages: Vec<Box<ProgrammingLanguageInterface>> = generators.iter().map(|x| x()).collect();
let option_matches = program_options().parse(std::env::args()).unwrap_or_else(|e| {
println!("{:?}", e);
exit(1);
});
if option_matches.opt_present("list-languages") {
for lang in languages {
println!("{}", lang.get_language_name());
}
exit(1);
}
if option_matches.opt_present("help") {
println!("{}", program_options().usage("Schala metainterpreter"));
exit(0);
}
if option_matches.opt_present("webapp") {
webapp::web_main(generators);
exit(0);
}
let language_names: Vec<String> = languages.iter().map(|lang| {lang.get_language_name()}).collect();
let initial_index: usize =
option_matches.opt_str("lang")
.and_then(|lang| { language_names.iter().position(|x| { x.to_lowercase() == lang.to_lowercase() }) })
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.unwrap_or(0);
let mut options = EvalOptions::default();
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options.execution_method = match option_matches.opt_str("eval-style") {
Some(ref s) if s == "compile" => ExecutionMethod::Compile,
_ => ExecutionMethod::Interpret,
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};
match option_matches.free[..] {
[] | [_] => {
let mut repl = Repl::new(languages, initial_index);
repl.run();
}
[_, ref filename, _..] => {
run_noninteractive(filename, languages, options);
}
};
}
fn run_noninteractive(filename: &str, languages: Vec<Box<ProgrammingLanguageInterface>>, options: EvalOptions) {
let path = Path::new(filename);
let ext = path.extension().and_then(|e| e.to_str()).unwrap_or_else(|| {
println!("Source file lacks extension");
exit(1);
});
let mut language = Box::new(languages.into_iter().find(|lang| lang.get_source_file_suffix() == ext)
.unwrap_or_else(|| {
println!("Extension .{} not recognized", ext);
exit(1);
}));
let mut source_file = File::open(path).unwrap();
let mut buffer = String::new();
source_file.read_to_string(&mut buffer).unwrap();
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match options.execution_method {
ExecutionMethod::Compile => {
/*
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let llvm_bytecode = language.compile(&buffer);
compilation_sequence(llvm_bytecode, filename);
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*/
panic!("Not ready to go yet");
},
ExecutionMethod::Interpret => {
let output = language.execute(&buffer, &options);
output.to_noninteractive().map(|text| println!("{}", text));
}
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}
}
struct Repl {
options: EvalOptions,
languages: Vec<Box<ProgrammingLanguageInterface>>,
current_language_index: usize,
interpreter_directive_sigil: char,
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console: rustyline::Editor<()>,
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}
impl Repl {
fn new(languages: Vec<Box<ProgrammingLanguageInterface>>, initial_index: usize) -> Repl {
let i = if initial_index < languages.len() { initial_index } else { 0 };
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let console = Editor::<()>::new();
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Repl {
options: Repl::get_options(),
languages: languages,
current_language_index: i,
interpreter_directive_sigil: '.',
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console
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}
}
fn get_options() -> EvalOptions {
File::open(".schala_repl")
.and_then(|mut file| {
let mut contents = String::new();
file.read_to_string(&mut contents)?;
Ok(contents)
})
.and_then(|contents| {
let options: EvalOptions = serde_json::from_str(&contents)?;
Ok(options)
}).unwrap_or(EvalOptions::default())
}
fn save_options(&self) {
let ref options = self.options;
let read = File::create(".schala_repl")
.and_then(|mut file| {
let buf = serde_json::to_string(options).unwrap();
file.write_all(buf.as_bytes())
});
if let Err(err) = read {
println!("Error saving .schala_repl file {}", err);
}
}
fn run(&mut self) {
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println!("Schala MetaInterpreter version {}", VERSION_STRING);
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self.console.get_history().load(".schala_history").unwrap_or(());
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loop {
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let language_name = self.languages[self.current_language_index].get_language_name();
let prompt_str = format!("{} >> ", language_name);
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match self.console.readline(&prompt_str) {
Err(ReadlineError::Eof) | Err(ReadlineError::Interrupted) => break,
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Err(e) => {
println!("Terminal read error: {}", e);
},
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Ok(ref input) => {
self.console.add_history_entry(input);
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if self.handle_interpreter_directive(input) {
continue;
}
let output = self.input_handler(input);
println!("=> {}", output);
}
}
}
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self.console.get_history().save(".schala_history").unwrap_or(());
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self.save_options();
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println!("Exiting...");
}
fn input_handler(&mut self, input: &str) -> String {
let ref mut language = self.languages[self.current_language_index];
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let interpreter_output = language.execute(input, &self.options);
interpreter_output.to_repl()
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}
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" => {
self.save_options();
exit(0)
},
"help" => {
println!("Commands:");
println!("exit | quit");
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println!("lang(uage) [go|show|next|previous]");
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println!("set [show|hide] [tokens|parse|symbols|eval|llvm]");
}
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"lang" | "language" => {
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match commands.get(1) {
Some(&"show") => {
for (i, lang) in self.languages.iter().enumerate() {
if i == self.current_language_index {
println!("* {}", lang.get_language_name());
} else {
println!("{}", lang.get_language_name());
}
}
},
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Some(&"go") => {
match commands.get(2) {
None => println!("Must specify a language name"),
Some(&desired_name) => {
for (i, _) in self.languages.iter().enumerate() {
let lang_name = self.languages[i].get_language_name();
if lang_name.to_lowercase() == desired_name.to_lowercase() {
self.current_language_index = i;
println!("Switching to {}", self.languages[self.current_language_index].get_language_name());
return true;
}
}
println!("Language {} not found", desired_name);
}
}
},
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Some(&"next") => {
self.current_language_index = (self.current_language_index + 1) % self.languages.len();
println!("Switching to {}", self.languages[self.current_language_index].get_language_name());
}
Some(&"prev") | Some(&"previous") => {
self.current_language_index = if self.current_language_index == 0 { self.languages.len() - 1 } else { self.current_language_index - 1 };
println!("Switching to {}", self.languages[self.current_language_index].get_language_name());
},
Some(e) => println!("Bad `lang` argument: {}", e),
None => println!("`lang` - valid arguments `show`, `next`, `prev`|`previous`"),
}
},
"set" => {
let show = match commands.get(1) {
Some(&"show") => true,
Some(&"hide") => false,
Some(e) => {
println!("Bad `set` argument: {}", e);
return true;
}
None => {
println!("`set` - valid arguments `show {{option}}`, `hide {{option}}`");
return true;
}
};
match commands.get(2) {
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Some(&"tokens") => self.options.debug.tokens = show,
Some(&"parse") => self.options.debug.parse_tree = show,
Some(&"ast") => self.options.debug.ast = show,
Some(&"symbols") => self.options.debug.symbol_table = show,
Some(&"llvm") => self.options.debug.llvm_ir = show,
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Some(e) => {
println!("Bad `show`/`hide` argument: {}", e);
return true;
}
None => {
println!("`show`/`hide` requires an argument");
return true;
}
}
},
e => println!("Unknown command: {}", e)
}
return true;
}
}
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/*
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pub fn compilation_sequence(llvm_code: LLVMCodeString, sourcefile: &str) {
use std::process::Command;
let ll_filename = "out.ll";
let obj_filename = "out.o";
let q: Vec<&str> = sourcefile.split('.').collect();
let bin_filename = match &q[..] {
&[name, "maaru"] => name,
_ => panic!("Bad filename {}", sourcefile),
};
let LLVMCodeString(llvm_str) = llvm_code;
println!("Compilation process finished for {}", ll_filename);
File::create(ll_filename)
.and_then(|mut f| f.write_all(llvm_str.as_bytes()))
.expect("Error writing file");
let llc_output = Command::new("llc")
.args(&["-filetype=obj", ll_filename, "-o", obj_filename])
.output()
.expect("Failed to run llc");
if !llc_output.status.success() {
println!("{}", String::from_utf8_lossy(&llc_output.stderr));
}
let gcc_output = Command::new("gcc")
.args(&["-o", bin_filename, &obj_filename])
.output()
.expect("failed to run gcc");
if !gcc_output.status.success() {
println!("{}", String::from_utf8_lossy(&gcc_output.stdout));
println!("{}", String::from_utf8_lossy(&gcc_output.stderr));
}
for filename in [obj_filename].iter() {
Command::new("rm")
.arg(filename)
.output()
.expect(&format!("failed to run rm {}", filename));
}
}
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*/
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fn program_options() -> getopts::Options {
let mut options = getopts::Options::new();
options.optopt("s",
"eval-style",
"Specify whether to compile (if supported) or interpret the language. If not specified, the default is language-specific",
"[compile|interpret]"
);
options.optflag("",
"list-languages",
"Show a list of all supported languages");
options.optopt("l",
"lang",
"Start up REPL in a language",
"LANGUAGE");
options.optflag("h",
"help",
"Show help text");
options.optflag("w",
"webapp",
"Start up web interpreter");
options
}