airlang 0.23.0

Air is a minimalist and universal programming language.
Documentation 
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use std::rc::Rc;

use const_format::concatcp;

use super::FreeImpl;
use crate::bug;
use crate::cfg::CfgMod;
use crate::cfg::extend_func;
use crate::semantics::cfg::Cfg;
use crate::semantics::core::Eval;
use crate::semantics::core::Id;
use crate::semantics::core::PREFIX_ID;
use crate::semantics::func::FreePrimFunc;
use crate::semantics::func::MutPrimFunc;
use crate::semantics::val::FreePrimFuncVal;
use crate::semantics::val::MutPrimFuncVal;
use crate::semantics::val::Val;
use crate::type_::Cell;
use crate::type_::Text;

#[derive(Clone)]
pub struct LangLib {
    pub data: FreePrimFuncVal,
    pub id: FreePrimFuncVal,
    pub code: MutPrimFuncVal,
    pub eval: MutPrimFuncVal,
    pub parse: FreePrimFuncVal,
    pub generate: FreePrimFuncVal,
}

const LANGUAGE: &str = "language";

pub const DATA: &str = concatcp!(PREFIX_ID, LANGUAGE, ".semantics.data");
pub const ID: &str = concatcp!(PREFIX_ID, LANGUAGE, ".semantics.id");
pub const CODE: &str = concatcp!(PREFIX_ID, LANGUAGE, ".semantics.code");
pub const EVAL: &str = concatcp!(PREFIX_ID, LANGUAGE, ".semantics.eval");
pub const PARSE: &str = concatcp!(PREFIX_ID, LANGUAGE, ".syntax.parse");
pub const GENERATE: &str = concatcp!(PREFIX_ID, LANGUAGE, ".syntax.generate");

impl Default for LangLib {
    fn default() -> Self {
        LangLib {
            data: data(),
            id: id(),
            code: code(),
            eval: eval(),
            parse: parse(),
            generate: generate(),
        }
    }
}

impl CfgMod for LangLib {
    fn extend(self, cfg: &Cfg) {
        extend_func(cfg, DATA, self.data);
        extend_func(cfg, ID, self.id);
        extend_func(cfg, CODE, self.code);
        extend_func(cfg, EVAL, self.eval);
        extend_func(cfg, PARSE, self.parse);
        extend_func(cfg, GENERATE, self.generate);
    }
}

pub fn data() -> FreePrimFuncVal {
    FreePrimFunc { raw_input: true, fn_: Rc::new(Id) }.into()
}

pub fn id() -> FreePrimFuncVal {
    FreePrimFunc { raw_input: false, fn_: Rc::new(Id) }.into()
}

pub fn code() -> MutPrimFuncVal {
    MutPrimFunc { raw_input: true, fn_: Rc::new(Eval) }.into()
}

pub fn eval() -> MutPrimFuncVal {
    MutPrimFunc { raw_input: false, fn_: Rc::new(Eval) }.into()
}

pub fn parse() -> FreePrimFuncVal {
    FreeImpl { free: fn_parse }.build()
}

fn fn_parse(cfg: &mut Cfg, input: Val) -> Val {
    let Val::Text(input) = input else {
        return bug!(cfg, "{PARSE}: expected input to be a text, but got {input}");
    };
    let Ok(val) = crate::syntax::parse(&input) else {
        return Val::default();
    };
    Val::Cell(Cell::new(val).into())
}

pub fn generate() -> FreePrimFuncVal {
    FreeImpl { free: fn_generate }.build()
}

fn fn_generate(_cfg: &mut Cfg, input: Val) -> Val {
    let str = format!("{input:#}");
    Val::Text(Text::from(str).into())
}