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|
use std::{collections::HashMap, sync::LazyLock};
use crate::{
ast,
eval::{Context, Error, Result, Value},
Wrap,
};
macro_rules! builtins {
($($f:ident),* $(,)?) => {
pub static BUILTINS: LazyLock<HashMap<&'static str, Box<dyn Fn(&mut Context, &[ast::Expr]) -> Result + Sync + Send>>> =
LazyLock::new(|| {
[
$((
stringify!($f),
Box::new($f) as Box<dyn Fn(&mut Context, &[ast::Expr]) -> Result + Sync + Send>,
)),*
]
.into_iter()
.collect()
});
}
}
builtins! {
print,
println,
// string
isupper,
islower,
substr,
// node
text,
parent,
children,
kind,
// list
length,
member,
push,
pop,
isempty,
}
fn print(ctx: &mut Context, args: &[ast::Expr]) -> Result {
for arg in args {
let val = ctx.eval_expr(arg)?;
let mut default_stream = Box::new(std::io::stdout()) as Box<dyn std::io::Write>;
let stream = ctx.output_stream.as_mut().unwrap_or(&mut default_stream);
write!(stream, "{val}").unwrap();
}
Ok(Value::Unit)
}
fn println(ctx: &mut Context, args: &[ast::Expr]) -> Result {
print(ctx, args)?;
print(ctx, &[ast::Expr::Lit(ast::Literal::Str("\n".to_owned()))])
}
fn isupper(ctx: &mut Context, args: &[ast::Expr]) -> Result {
Ok(ctx
.eval_expr(&get_args::<1>(args)?[0])?
.as_str()?
.chars()
.all(|c| c.is_ascii_uppercase())
.into())
}
fn islower(ctx: &mut Context, args: &[ast::Expr]) -> Result {
Ok(ctx
.eval_expr(&get_args::<1>(args)?[0])?
.as_str()?
.chars()
.all(|c| c.is_ascii_lowercase())
.into())
}
fn substr(ctx: &mut Context, args: &[ast::Expr]) -> Result {
if let Ok([string, start, end]) = get_args::<3>(args) {
let v = ctx.eval_expr(string)?;
let s = v.as_str()?;
let start = ctx.eval_expr(start)?.as_int()?;
let end = ctx.eval_expr(end)?.as_int()?;
if start < 0 || start >= s.len() as i128 || end >= s.len() as i128 || start > end {
return Err(Error::InvalidStringSlice {
length: s.len(),
start,
end,
});
}
Ok(s[start as usize..end as usize].into())
} else {
let [string, end] = get_args::<2>(args)?;
let v = ctx.eval_expr(string)?;
let s = v.as_str()?;
let end = ctx.eval_expr(end)?.as_int()?;
if end >= s.len() as i128 {
return Err(Error::InvalidStringSlice {
length: s.len(),
start: 0,
end,
});
}
Ok(s[..end as usize].into())
}
}
fn text(ctx: &mut Context, args: &[ast::Expr]) -> Result {
let v = ctx.eval_expr(&get_args::<1>(args)?[0])?;
let id = v.as_node()?;
let node = ctx.get_node_by_id(id).unwrap();
let text = node
.utf8_text(ctx.input_src.as_ref().unwrap().as_bytes())
.unwrap();
text.to_owned().wrap(Value::String).wrap(Ok)
}
fn parent(ctx: &mut Context, args: &[ast::Expr]) -> Result {
let v = ctx.eval_expr(&get_args::<1>(args)?[0])?;
let id = v.as_node()?;
let node = ctx.get_node_by_id(id).unwrap();
let parent = node.parent();
parent
.map(|n| Value::Node(n.id()))
.ok_or(Error::NoParentNode(node))
}
fn children(ctx: &mut Context, args: &[ast::Expr]) -> Result {
let v = ctx.eval_expr(&get_args::<1>(args)?[0])?;
let id = v.as_node()?;
let node = ctx.get_node_by_id(id).unwrap();
let children = node
.children(&mut node.walk())
.map(|c| Value::Node(c.id()))
.collect::<Vec<_>>();
Ok(Value::List(children))
}
fn length(ctx: &mut Context, args: &[ast::Expr]) -> Result {
let v = ctx.eval_expr(&get_args::<1>(args)?[0])?;
let l = v.as_list()?;
(l.len() as i128).wrap(Value::Integer).wrap(Ok)
}
fn kind(ctx: &mut Context, args: &[ast::Expr]) -> Result {
let v = ctx.eval_expr(&get_args::<1>(args)?[0])?;
let id = v.as_node()?;
let node = ctx.get_node_by_id(id).unwrap();
node.kind().to_owned().wrap(Value::String).wrap(Ok)
}
fn member(ctx: &mut Context, args: &[ast::Expr]) -> Result {
let [list_expr, element_expr] = get_args::<2>(args)?;
let list = ctx.eval_expr(list_expr)?;
let v = list.as_list()?;
let element = ctx.eval_expr(element_expr)?;
v.iter()
.any(|item| item == &element)
.wrap(Value::Boolean)
.wrap(Ok)
}
fn push(ctx: &mut Context, args: &[ast::Expr]) -> Result {
let [lhs, rhs] = get_args::<2>(args)?;
let ast::Expr::Ident(ident) = lhs else {
return Err(Error::MalformedExpr(format!(
"malformed assigment, lhs: {:?}",
lhs
)));
};
let element = ctx.eval_expr(rhs)?;
let variable = ctx.lookup_mut(ident)?;
variable.mutate(|v| match &mut v.value {
Value::List(l) => {
l.push(element);
Ok(Value::Unit)
}
_ => Err(v.ty().expected([ast::Type::List])),
})
}
fn pop(ctx: &mut Context, args: &[ast::Expr]) -> Result {
let [lhs] = get_args::<1>(args)?;
let ast::Expr::Ident(ident) = lhs else {
return Err(Error::MalformedExpr(format!(
"malformed assigment, lhs: {:?}",
lhs
)));
};
let variable = ctx.lookup_mut(ident)?;
variable.mutate(|v| match &mut v.value {
Value::List(l) => l.pop().ok_or(Error::ArrayOutOfBounds { idx: 0, len: 0 }),
_ => Err(v.ty().expected([ast::Type::List])),
})
}
fn isempty(ctx: &mut Context, args: &[ast::Expr]) -> Result {
let v = ctx.eval_expr(&get_args::<1>(args)?[0])?;
match v.ty() {
ast::Type::List => v
.as_list()
.unwrap()
.is_empty()
.wrap(Value::Boolean)
.wrap(Ok),
ast::Type::String => v.as_str().unwrap().is_empty().wrap(Value::Boolean).wrap(Ok),
_ => Err(v.ty().expected([ast::Type::List])),
}
}
fn get_args<const N: usize>(args: &[ast::Expr]) -> std::result::Result<&[ast::Expr; N], Error> {
args.try_into().map_err(|_| Error::IncorrectArgFormat {
wanted: N,
got: args.len(),
})
}
#[cfg(test)]
mod test {
use super::*;
use crate::{ast::*, eval::*};
#[test]
fn test_ts_builtins() {
let language = tree_sitter_python::language();
let mut ctx = Context::new(language).with_program(Program::new());
assert_eq!(
ctx.eval_block(&Block {
body: vec![Statement::decl(Type::List, "a", Expr::list([Expr::int(5)]),)]
}),
Ok(Value::Unit)
);
assert_eq!(
ctx.lookup(&String::from("a")).unwrap().clone(),
Variable {
ty: Type::List,
name: "a".to_owned(),
value: vec![5usize.into()].into(),
}
);
}
}
|
