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Original file line number | Diff line number | Diff line change |
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use std::env; | ||
use std::path::Path; | ||
use std::process::Command; | ||
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use swipl_info::get_swipl_info; | ||
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fn main() { | ||
println!("cargo:rerun-if-changed=build.rs"); | ||
println!("cargo:rerun-if-changed=mlatu.pl"); | ||
println!("cargo:rustc-link-arg=-Wl,-rpath,{}", get_swipl_info().lib_dir); | ||
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let out_dir = env::var_os("OUT_DIR").unwrap(); | ||
let dest_path = Path::new(&out_dir).join("mlatu.pl.save"); | ||
Command::new("swipl").arg("-o") | ||
.arg(dest_path) | ||
.arg("--goal=true") | ||
.arg("-c") | ||
.arg("mlatu.pl") | ||
.spawn() | ||
.expect("spawn") | ||
.wait() | ||
.expect("wait"); | ||
} |
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:- module(mlatu, [rewrite/2, user_equiv/2]). | ||
:- dynamic([user_equiv/2], [multifile, discontiguous]). | ||
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equiv(Xs, Other) :- | ||
user_equiv(Xs, Other) ; | ||
builtin_equiv(Xs, Other). | ||
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builtin_equiv(['d',X|Xs], Other) :- | ||
equiv([X,X|Xs], Other). | ||
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builtin_equiv(['r',_|Xs], Other) :- | ||
equiv(Xs, Other). | ||
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builtin_equiv(['u',Quote|Xs], Other) :- | ||
append(Quote, Xs, NewXs), | ||
equiv(NewXs, Other). | ||
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builtin_equiv(['q',X|Xs], Other) :- | ||
equiv([[X]|Xs], Other). | ||
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builtin_equiv(['c',Quote1,Quote2|Xs], Other) :- | ||
append(Quote1, Quote2, NewQuote), | ||
equiv([NewQuote|Xs], Other). | ||
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builtin_equiv(['s',A,B|Xs], Other) :- | ||
equiv([B,A|Xs],Other). | ||
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builtin_equiv([], []). | ||
builtin_equiv([X|Xs], Other) :- | ||
equiv(Xs, New), | ||
(Xs \= New -> | ||
equiv([X|New], Other) ; | ||
Other = [X|Xs]). | ||
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rewrite(List, Other) :- | ||
equiv(List, Other), | ||
List \= Other. |
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@@ -1,2 +1,12 @@ | ||
q = ( ) const; | ||
swap = q dip; | ||
concat = c; | ||
unquote = u; | ||
quote = q; | ||
swap = s; | ||
remove = r; | ||
dup = d; | ||
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prepend = swap quote swap concat; | ||
p = prepend; | ||
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unquote-before = swap quote cat unquote; | ||
uqb = unquote-before; |
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Original file line number | Diff line number | Diff line change |
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@@ -1,22 +1,96 @@ | ||
use async_std::fs::OpenOptions; | ||
use async_std::io; | ||
use async_std::io::prelude::*; | ||
use async_std::path::PathBuf; | ||
use async_std::prelude::*; | ||
use mlatu::parse_rules; | ||
use mlatu::{parse_rules, parse_terms, prolog}; | ||
use prolog::util::AssertLocation; | ||
use prolog::{codegen, ContextExt}; | ||
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// TODO: actual CLI, better REPL (w/ rustyline) | ||
// TODO: Bring back structural editing | ||
// BUG: Ctrl-C forwards to SWIPl | ||
#[async_std::main] | ||
async fn main() -> std::io::Result<()> { | ||
// let path = if let Some(filename) = std::env::args().nth(2) { | ||
// PathBuf::from(filename) | ||
// } else { | ||
// PathBuf::from("./prelude.mlt") | ||
// }; | ||
// let mut file = | ||
// OpenOptions::new().read(true).write(true).create(true).open(path).await?; | ||
// let mut s = String::new(); | ||
// let _ = file.read_to_string(&mut s).await?; | ||
// match parse_rules(&s) { | ||
// | Ok(rules) => Editor::new(file, rules).unwrap().run().await, | ||
// | Err(error) => eprintln!("{}", error), | ||
// } | ||
Ok(()) | ||
let engine = mlatu::prolog::init_engine(); | ||
let ctx:prolog::Context<'_, _> = engine.activate().into(); | ||
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let path = if let Some(filename) = std::env::args().nth(2) { | ||
PathBuf::from(filename) | ||
} else { | ||
PathBuf::from("./prelude.mlt") | ||
}; | ||
let mut file = OpenOptions::new().read(true).write(true).create(true).open(path).await?; | ||
let mut s = String::new(); | ||
let _ = file.read_to_string(&mut s).await?; | ||
let rules = match parse_rules(&s) { | ||
| Ok(rules) => rules, | ||
| Err(error) => { | ||
eprintln!("{}", error); | ||
return Ok(()) | ||
}, | ||
}; | ||
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let module = prolog::Module::new("mlatu"); | ||
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let clauses = match codegen::generate(&ctx, &rules) { | ||
| Ok(clauses) => clauses, | ||
| Err(error) => { | ||
eprintln!("Error while compiling rules: {}", error); | ||
return Ok(()) | ||
}, | ||
}; | ||
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if let Err(error) = | ||
clauses.into_iter() | ||
.try_for_each(|clause| ctx.assert(&clause.clause, Some(&module), AssertLocation::Last)) | ||
{ | ||
eprintln!("Error while compiling rules: {}", error); | ||
return Ok(()) | ||
}; | ||
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let stdin = io::stdin(); | ||
let mut stdout = io::stdout(); | ||
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loop { | ||
let mut contents = String::new(); | ||
print!(">>> "); | ||
stdout.flush().await?; | ||
stdin.read_line(&mut contents).await?; | ||
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if contents.trim() == "exit" || contents.trim() == "quit" || contents.is_empty() { | ||
println!("Goodbye!"); | ||
break Ok(()) | ||
} | ||
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let terms = match parse_terms(&contents) { | ||
| Ok(terms) => terms, | ||
| Err(error) => { | ||
eprintln!("{}", error); | ||
continue | ||
}, | ||
}; | ||
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let (list, other) = match codegen::generate_query(&ctx, &terms) { | ||
| Ok(q) => q, | ||
| Err(error) => { | ||
eprintln!("Error while compiling query: {}", error); | ||
continue | ||
}, | ||
}; | ||
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if let Err(error) = ctx.call_once(prolog::pred!(mlatu: rewrite / 2), [&list, &other]) { | ||
eprintln!("Error while executing query: {}", error); | ||
continue | ||
} | ||
// TODO: proper printing | ||
let canon = match ctx.canonical(&other) { | ||
| Some(s) => s, | ||
| None => { | ||
eprintln!("Could not format output"); | ||
continue | ||
}, | ||
}; | ||
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println!("==> {}", canon); | ||
} | ||
} |
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,22 @@ | ||
pub use swipl::fli; | ||
pub use swipl::prelude::*; | ||
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pub mod codegen; | ||
pub mod util; | ||
pub use util::ContextExt; | ||
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static SAVED_STATE:&[u8] = include_bytes!(concat!(env!("OUT_DIR"), "/mlatu.pl.save")); | ||
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#[must_use] | ||
pub fn init_engine() -> Engine { | ||
let bytes = SAVED_STATE.as_ptr(); | ||
// SAFETY: This is called *before* `PL_initialise` (called when creating an | ||
// engine). This data is also valid and the length is correct, as we take the | ||
// pointer and length from a known valid slice. | ||
let len = u64::try_from(SAVED_STATE.len()).expect("length"); | ||
unsafe { | ||
fli::PL_set_resource_db_mem(bytes, len); | ||
} | ||
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Engine::new() | ||
} |
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