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#![allow(incomplete_features)]
#![feature(const_generics)]
#![feature(iter_intersperse)]
#![deny(rust_2018_idioms)]
#![allow(clippy::needless_lifetimes)]
#![allow(clippy::upper_case_acronyms)]
use std::{fmt, fs};
use std::collections::{HashMap, hash_map::DefaultHasher};
use std::hash::{Hash, Hasher};
use std::path::{Path, PathBuf};
use lazy_static::lazy_static;
use maplit::hashmap;
#[cfg(feature = "readline")]
use rustyline as rl;
#[cfg(not(feature = "readline"))]
use std::io::{self, BufRead, Write};
#[cfg(feature = "compile")]
use serde::{Serialize, Deserialize, Serializer, Deserializer, ser, de};
#[cfg(feature = "compile")]
use std::fmt::Display;
mod hashablemap;
use hashablemap::*;
mod parsing;
use parsing::*;
mod runnable;
pub use runnable::*;
mod ops;
use ops::*;
mod umcore;
mod umstd;
mod ummod;
#[derive(Debug, Clone)]
pub enum Error {
ArgumentError(String),
ParseError(String, Option<Pos>),
ScriptError(String, Option<Pos>),
ControlError(String, Option<TVal>),
CustomError(TVal),
}
impl fmt::Display for Error {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
use Error::*;
match self {
ArgumentError(m) => write!(f, "Argument Error: {}", m),
ParseError(m, pos) => match pos {
Some(pos) => write!(f, "Parse Error at {}: {}", pos, m),
None => write!(f, "Parse Error: {}", m),
},
ScriptError(m, pos) => match pos {
Some(pos) => write!(f, "Script Error at {}: {}", pos, m),
None => write!(f, "Script Error: {}", m),
},
ControlError(m, v) => write!(f, "Control Error: {}: {:?}", m, v),
CustomError(v) => write!(f, "Other Error: {}", v.val),
}
}
}
#[cfg(feature = "compile")]
impl ser::Error for Error {
fn custom<T: Display>(msg: T) -> Self
{
Error::ScriptError(msg.to_string(), None)
}
}
#[cfg(feature = "compile")]
impl de::Error for Error {
fn custom<T: Display>(msg: T) -> Self
{
Error::ScriptError(msg.to_string(), None)
}
}
impl std::error::Error for Error {}
pub struct Args {
pub longflags: Vec<String>,
pub script: Vec<String>,
}
impl Args {
pub fn handle() -> Result<Args, Error> {
let mut args = Args {
longflags: vec![],
script: vec![],
};
let eargs: Vec<String> = std::env::args().collect();
let mut i = 1;
let mut sa = false;
while i < eargs.len() {
if sa {
args.script.push(eargs[i].clone());
} else if eargs[i].starts_with('-') {
if eargs[i].starts_with("--") {
args.longflags.push(eargs[i][2..].into());
} else {
return Err(Error::ArgumentError(format!("Unsupported arg: {}", eargs[i])))
}
} else {
sa = true;
continue;
}
i += 1;
}
Ok(args)
}
}
#[derive(Clone, PartialEq, Eq)]
pub struct Env<'a> {
parent: Option<&'a Env<'a>>,
vars: HashMap<String, RefTVal>,
}
lazy_static! {
static ref PRELUDE: Env<'static> = {
let mut vars: HashMap<String, RefTVal> = hashmap!{
"_".into() => Value::Type(Type::any(), HashableMap::arc()).into(),
};
umcore::init(&mut vars);
umstd::init(&mut vars);
Env {
parent: None,
vars,
}
};
}
impl<'a> Env<'a> {
pub fn prelude() -> Env<'a> {
PRELUDE.clone()
}
pub fn empty() -> Env<'a> {
Env {
parent: None,
vars: hashmap!{},
}
}
pub fn child(parent: &'a Env<'a>) -> Env<'a> {
Env {
parent: Some(parent),
vars: hashmap!{},
}
}
pub fn iter_flatten<'b>(it: &'b Env<'a>) -> Box<dyn Iterator<Item = (&'b String, &'b RefTVal)> + 'b> {
if let Some (p) = it.parent {
return Box::new(Self::iter_flatten(p).chain(it.vars.iter()));
} else {
return Box::new(it.vars.iter());
}
}
pub fn flatten<'b>(old: &'b Env<'a>) -> Env<'a> {
Env::from(
Self::iter_flatten(old)
.map(|(k, v)| {
(k.clone(), v.clone())
}).collect::<HashMap<String, RefTVal>>()
)
}
pub fn get(&self, name: &str) -> Option<&RefTVal> {
match self.vars.get(name) {
Some(v) => Some(v),
None => match &self.parent {
Some(p) => p.get(name),
None => None,
},
}
}
pub fn has(&self, name: &str) -> bool {
match self.vars.contains_key(name) {
true => true,
false => match &self.parent {
Some(p) => p.has(name),
None => false,
},
}
}
pub fn set(&mut self, name: &str, rv: &RefTVal) {
self.vars.insert(name.into(), RefTVal::clone(rv));
}
pub fn update(&mut self, vars: HashMap<String, RefTVal>) {
self.vars.extend(vars);
}
pub fn diff(&self, nenv: &'a mut Env<'a>) -> HashMap<String, RefTVal> {
let outer = match self.parent {
Some(p) => p,
None => self,
};
let mut vars = hashmap!{};
for (k, v) in nenv.vars.drain() {
if let Some(ov) = outer.get(&k) {
if ov != &v {
vars.insert(k, v);
}
}
}
vars
}
}
impl<'a> From<HashableMap<String, RefTVal>> for Env<'a> {
fn from(vars: HashableMap<String, RefTVal>) -> Env<'a> {
Env {
parent: None,
vars: vars.map,
}
}
}
impl<'a> From<HashMap<String, RefTVal>> for Env<'a> {
fn from(vars: HashMap<String, RefTVal>) -> Env<'a> {
Env {
parent: None,
vars,
}
}
}
impl<'a> fmt::Debug for Env<'a> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
let parent = match self.parent {
Some(_) => "Some(Env {...})",
None => "None",
};
write!(f, "Env {{ parent: {}, vars: {{{:?}}} }}", parent, self.vars)
}
}
#[cfg(feature = "compile")]
impl<'a> Serialize for Env<'a> {
fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
where
S: Serializer
{
let nenv = Env::flatten(self);
nenv.vars.serialize(serializer)
}
}
#[cfg(feature = "compile")]
impl<'a, 'de> Deserialize<'de> for Env<'a> {
fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
where
D: Deserializer<'de>
{
Ok(Env::from(HashMap::deserialize(deserializer)?))
}
}
pub fn compile<'a>(scriptname: &str, script: &str, env: &'a Env<'a>, pos: Option<Pos>, printout: usize) -> Result<Runnable<'a>, Error> {
let lines: Vec<Line> = Lines::split(scriptname, script, pos)
.inspect(|l| {
if printout > 0 && !l.data.starts_with("//") {
println!("{}", l);
}
}).collect();
let exprs: Vec<Expr> = lines.iter().flat_map(|l| Exprs::split(&l)).collect();
let mut tokens: Vec<Tokens> = exprs.iter().map(|e| Tokens::tokenize(&e))
.inspect(|ts| {
if printout > 1 {
print!(" tokens: [");
for t in ts.clone() {
print!("{}, ", t);
}
println!("]");
}
}).collect();
let asts: Result<Vec<AST>, Error> = tokens.drain(0..).map(|ts| {
AST::parse(ts, &env)
}).collect();
let mut shash = DefaultHasher::new();
env!("CARGO_PKG_VERSION").hash(&mut shash);
script.hash(&mut shash);
Ok(Runnable {
hash: shash.finish(),
env: Env::child(env),
ast: AST::Container {
token: Token {
ttype: TokenType::Container,
pos: Pos {
filename: scriptname.into(),
line: 0,
col: 0,
},
data: "{".into(),
},
children: asts?,
},
})
}
pub fn run<'a>(scriptname: &str, script: &str, env: &'a Env<'a>, pos: Option<Pos>, printout: (usize, bool)) -> FnReturn {
let run = match compile(scriptname, script, env, pos, printout.0) {
Ok(r) => r,
Err(m) => {
if printout.1 {
eprintln!("{}\n", m);
}
return (None, Err(m));
},
};
match run.ast {
AST::Container { children, .. } => {
let mut nenv = Env::child(env);
let vals: Result<Vec<RefTVal>, Error> = children.iter()
.map(|ast| {
let (vars, val) = ast.run(&nenv);
if let Some(vars) = vars {
nenv.update(vars);
}
if printout.1 {
match val {
Ok(ref v) => {
match ast {
AST::Container { token, .. } if token.data.starts_with("//") => {},
_ => println!("==> {}\n", v),
}
},
Err(ref m) => eprintln!("{}\n", m),
}
}
val
}).collect();
match vals {
Ok(mut vals) => match vals.pop() {
Some(v) => (Some(nenv.vars), Ok(v)),
None => (None, Ok(Value::none().into())),
},
Err(m) => (None, Err(m)),
}
},
_ => (None, Err(Error::ScriptError("expected script container AST".into(), None))),
}
}
pub fn run_path<'a, P: AsRef<Path>>(path: &P, env: &'a Env<'a>, run_main: bool) -> FnReturn {
let path = path.as_ref();
let path: PathBuf = if path.is_dir() {
path.join("main.um")
} else if !path.is_file() {
path.with_extension("um")
} else {
PathBuf::from(path)
};
let script = match fs::read_to_string(&path) {
Ok(s) => s,
Err(m) => return (None, Err(Error::ScriptError(format!("Failed to load {}: {}", path.display(), m), None))),
};
let (vars, val) = match run(&path.to_string_lossy(), &script, env, None, (0, false)) {
(vars, Ok(v)) => (vars, v),
(vars, Err(m)) => return (vars, Err(m)),
};
if run_main {
if let Some(vars) = &vars {
if let Some(main) = vars.get("main") {
if let Value::Function { body, .. } = main.clone_out().val {
let mut nenv = Env::child(env);
nenv.update(vars.clone());
let (_, val) = body.call(&nenv, FnArgs::Normal {
this: Box::new(main.clone()),
pos: None,
args: TVal {
ttype: Type::none(),
val: Value::none(),
}.into(),
});
return (Some(nenv.vars), val);
}
}
}
}
(vars, Ok(val))
}
#[cfg(feature = "readline")]
fn run_interactive_readline<'a>(env: &'a Env<'a>) {
let mut nenv = Env::child(env);
let mut pos = Pos::start("<stdin>");
let mut ed = rl::Editor::<()>::new();
loop {
use rl::error::ReadlineError::*;
match ed.readline(&format!("um:{}> ", pos.line)) {
Ok(line) => {
if line.trim().is_empty() {
println!();
continue;
}
ed.add_history_entry(line.clone());
let (vars, _) = run("<stdin>", &line, &nenv, Some(pos.clone()), (0, true));
if let Some(vars) = vars {
nenv.update(vars);
}
pos.line += 1;
},
Err(Interrupted) => {
println!("^C");
return
},
Err(Eof) => continue,
Err(m) => {
println!("Error: {:?}", m);
continue;
},
}
}
}
pub fn run_interactive<'a>(env: &'a Env<'a>) {
#[cfg(feature = "readline")]
return run_interactive_readline(env);
#[cfg(not(feature = "readline"))]
{
let mut nenv = Env::child(env);
let mut pos = Pos::start("<stdin>");
let mut line = String::new();
loop {
line.clear();
print!("um:{}> ", pos.line);
io::stdout().flush().unwrap();
io::stdin().lock().read_line(&mut line).unwrap();
if line.trim().is_empty() {
println!();
continue;
}
let (vars, _) = run("<stdin>", &line, &nenv, Some(pos.clone()), (0, true));
if let Some(vars) = vars {
nenv.update(vars);
}
pos.line += 1;
}
}
}