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Big project dir refactor

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* split into multi member workspace in preparation for a no_std core
* env and posix stuff neatly crammed into a seperate shell project
* some pokes at interactive-devel.f
* updated ci
* removed 'l' shortcut for 'load' and update docs
* remove out of date readme content
* updated tests
* more sensible cond implementation and extra tests
* substr stdlib function with tests

Signed-off-by: Ava Affine <ava@sunnypup.io>
This commit is contained in:
Ava Apples Affine 2024-07-10 13:22:28 -07:00
parent aa56570d7d
commit 6d2925984f
44 changed files with 967 additions and 779 deletions
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110
src/eval.rs
View file

@ -1,110 +0,0 @@
/* Flesh: Flexible Shell
* Copyright (C) 2021 Ava Affine
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
use crate::segment::{Ctr, Seg};
use crate::sym::{SymTable, call_lambda};
use crate::error::Traceback;
/* iterates over a syntax tree
* returns a NEW LIST of values
* representing the simplest possible form of the input
*/
pub fn eval(ast: &Seg, syms: &mut SymTable) -> Result<Box<Ctr>, Traceback> {
// data to return
let mut ret = Box::from(Ctr::None);
let mut first = true;
// to be assigned from cloned/evaled data
let mut car;
let mut cdr;
// lets me redirect the input
let mut arg_car = &ast.car;
let mut arg_cdr = &ast.cdr;
// iterate over ast and build out ret
let mut none = false;
while !none {
match &**arg_car {
Ctr::Seg(ref inner) => {
let interm = eval(inner, syms)?;
if let Ctr::Lambda(ref l) = *interm {
return call_lambda(l, arg_cdr, syms)
} else {
car = interm;
}
},
Ctr::Lambda(ref l) => return Ok(call_lambda(l, arg_cdr, syms)?),
Ctr::Symbol(ref tok) => {
let outer_scope_seg_holder: Seg;
let args: &Seg;
if let Ctr::Seg(ref candidate_args) = **arg_cdr {
args = candidate_args;
} else {
outer_scope_seg_holder = Seg::from_mono(arg_cdr.clone());
args = &outer_scope_seg_holder;
}
car = syms.call_symbol(tok, args, first)?;
if let Some(b) = syms.is_function_type(tok) {
if b {
return Ok(car);
}
}
}
_ => {
car = arg_car.clone();
}
}
match **arg_cdr {
Ctr::Symbol(ref tok) => {
let blank = Seg::new();
cdr = syms.call_symbol(tok, &blank, false)?;
none = true;
}
Ctr::Seg(ref next) => {
cdr = Box::from(Ctr::None);
arg_car = &next.car;
arg_cdr = &next.cdr
}
_ => {
cdr = arg_cdr.clone();
none = true;
}
}
if let Ctr::None = *ret {
*ret = Ctr::Seg(Seg::from(car, cdr))
} else if let Ctr::Seg(ref mut s) = *ret {
s.append(car);
if let Ctr::None = *cdr {
} else {
s.append(cdr);
}
}
first = false;
}
Ok(ret)
}