pipa-lang 1.0.0-alpha.1

A tiny template language
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28

// SPDX-FileCopyrightText: Copyright 2026 olav@occy.org
// SPDX-License-Identifier: MPL-2.0

use crate::lang::adapter::Adapter;
use crate::lang::args::eval_args;
use crate::lang::arity::Arity;
use crate::lang::arity::assert_func_arity;
use crate::lang::error::Error;
use crate::lang::machine::Machine;
use crate::lang::node::Node;
use crate::value::Value;
use crate::value::list::List;

pub(crate) fn repeat(
    adapter: &impl Adapter,
    machine: &mut Machine<'_>,
    stdin: Option<&Value>,
    node: Node,
) -> Result<Value, Error> {
    assert_func_arity(adapter, machine, stdin, &node, &Arity::new(2))?;

    let mut node = eval_args(adapter, machine, stdin, node)?;
    let value = node.pop().flatten().unwrap_or_default();
    let count = node.pop().flatten().unwrap_or_default();
    let count = count.as_usize().unwrap_or_default();

    Ok(core::iter::repeat_n(value, count).collect::<List>().into())
}