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|
use crate::{
lisp::{
error::{EvalError, LispError},
expr::{Arity, LispExpr},
number::LispNumber,
Environment,
},
primitive,
};
use std::{convert::TryInto, fs::File, io::Write, path::PathBuf};
use log::info;
#[macro_export]
macro_rules! primitive {
($env:expr, $arity:expr, $name:expr, $closure:expr) => {
let val = crate::lisp::expr::LispExpr::PrimitiveFunc(crate::lisp::expr::PrimitiveFunc {
arity: $arity,
closure: $closure,
});
let _ = $env.insert($name.to_string(), val);
};
}
pub fn new_env() -> Environment {
let mut env = Environment::new();
primitive!(env, Arity::Atleast(2), "+", |args, _| {
let nums = args
.into_iter()
.map(|arg| arg.try_into())
.collect::<Result<Vec<&LispNumber>, LispError>>()?;
return Ok(LispExpr::Number(
nums.iter().fold(LispNumber::Integer(0), |acc, &x| acc + *x),
));
});
primitive!(env, Arity::Atleast(2), "-", |args, _| {
let nums = args
.into_iter()
.map(|arg| arg.try_into())
.collect::<Result<Vec<&LispNumber>, LispError>>()?;
let mut acc = nums[0].clone();
for arg in nums.into_iter().skip(1) {
acc = acc - *arg;
}
Ok(LispExpr::Number(acc))
});
primitive!(env, Arity::Atleast(2), "*", |args, _| {
let nums = args
.into_iter()
.map(|arg| arg.try_into())
.collect::<Result<Vec<&LispNumber>, LispError>>()?;
return Ok(LispExpr::Number(
nums.iter().fold(LispNumber::Integer(1), |acc, &x| acc * *x),
));
});
primitive!(env, Arity::Atleast(2), "/", |args, _| {
let nums = args
.into_iter()
.map(|arg| arg.try_into())
.collect::<Result<Vec<&LispNumber>, LispError>>()?;
let mut acc = nums[0].clone();
for arg in nums.into_iter().skip(1) {
acc = acc.div(*arg)?;
}
Ok(LispExpr::Number(acc))
});
primitive!(env, Arity::Exact(0), "toggle-grid", |_, app| {
app.toggle_grid();
Ok(LispExpr::Unit)
});
primitive!(env, Arity::Atleast(2), "and", |args, _| {
if args
.iter()
.any(|arg| matches!(arg, LispExpr::BoolLit(false)))
{
Ok(LispExpr::BoolLit(false))
} else {
Ok(LispExpr::BoolLit(true))
}
});
primitive!(env, Arity::Atleast(2), "or", |args, _| {
if args
.iter()
.any(|arg| matches!(arg, LispExpr::BoolLit(true)))
{
Ok(LispExpr::BoolLit(true))
} else {
Ok(LispExpr::BoolLit(false))
}
});
primitive!(env, Arity::Exact(1), "not", |args, _| {
if matches!(&args[0], LispExpr::BoolLit(false)) {
Ok(LispExpr::BoolLit(true))
} else {
Ok(LispExpr::BoolLit(false))
}
});
primitive!(env, Arity::Atleast(1), "begin", |args, _| {
if args.is_empty() {
Err(EvalError::ArgumentCount(Arity::Atleast(1)).into())
} else {
Ok(args.into_iter().last().unwrap().clone())
}
});
primitive!(env, Arity::Exact(0), "quit", |_, app| {
app.quit();
Ok(LispExpr::Unit)
});
primitive!(env, Arity::Exact(2), "eq?", |args, app| {
let s = &args[0];
let o = &args[1];
info!("comparing {} {}", s, o);
let result = s.compare(o, &app.lisp_env);
result.map(LispExpr::BoolLit)
});
primitive!(env, Arity::Exact(2), ">", |args, _| {
let nums = args
.into_iter()
.map(|arg| arg.try_into())
.collect::<Result<Vec<&LispNumber>, LispError>>()?;
let acc = nums[0].clone();
Ok(LispExpr::BoolLit(
nums.into_iter().skip(1).all(|&arg| acc > arg),
))
});
primitive!(env, Arity::Exact(2), ">=", |args, _| {
let nums = args
.into_iter()
.map(|arg| arg.try_into())
.collect::<Result<Vec<&LispNumber>, LispError>>()?;
let acc = nums[0].clone();
Ok(LispExpr::BoolLit(
nums.into_iter().skip(1).all(|&arg| acc >= arg),
))
});
primitive!(env, Arity::Exact(2), "<", |args, _| {
let nums = args
.into_iter()
.map(|arg| arg.try_into())
.collect::<Result<Vec<&LispNumber>, LispError>>()?;
let acc = nums[0].clone();
Ok(LispExpr::BoolLit(
nums.into_iter().skip(1).all(|&arg| acc < arg),
))
});
primitive!(env, Arity::Exact(2), "<=", |args, _| {
let nums = args
.into_iter()
.map(|arg| arg.try_into())
.collect::<Result<Vec<&LispNumber>, LispError>>()?;
let acc = nums[0].clone();
Ok(LispExpr::BoolLit(
nums.into_iter().skip(1).all(|&arg| acc <= arg),
))
});
primitive!(env, Arity::Exact(1), "string-len", |args, _| {
match &args[0] {
LispExpr::StringLit(s) => Ok(LispExpr::Number(LispNumber::Integer(s.len() as i64))),
_ => Err(EvalError::TypeMismatch.into()),
}
});
primitive!(env, Arity::Atmost(1), "save", |args, app| {
let image = app.export().encode().unwrap();
if args.len() == 1 && matches!(&args[0], LispExpr::StringLit(_)) {
let mut buffer = File::create(&args[0].as_ref()).unwrap();
buffer.write_all(&image[..]).unwrap();
} else if let Some(p) = app.file_name {
let file_name = p;
let mut buffer = File::create(&file_name).unwrap();
buffer.write_all(&image[..]).unwrap();
} else {
return Err(EvalError::NoFileName.into());
}
return Ok(LispExpr::Unit);
});
env
}
|
