pipa-lang 1.0.0-alpha.1

A tiny template language
Documentation 
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// SPDX-FileCopyrightText: Copyright 2026 olav@occy.org
// SPDX-License-Identifier: MPL-2.0

use crate::lang::adapter::Adapter;
use crate::lang::args::eval_numeric_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::number::Number;

pub(crate) fn math_unary_facade(
    adapter: &impl Adapter,
    machine: &mut Machine<'_>,
    stdin: Option<&Value>,
    node: Node,
    f: impl Fn(Number) -> Number,
) -> Result<Value, Error> {
    assert_func_arity(adapter, machine, stdin, &node, &Arity::new(1))?;

    let node = eval_numeric_args(adapter, machine, stdin, node)?;
    let node = node.and_then(|mut n| n.pop()).map(f);

    Ok(node.into())
}

pub(crate) fn math_binary_facade(
    adapter: &impl Adapter,
    machine: &mut Machine<'_>,
    stdin: Option<&Value>,
    node: Node,
    f: impl Fn(Number, Number) -> Number,
) -> Result<Value, Error> {
    assert_func_arity(adapter, machine, stdin, &node, &Arity::min(1))?;

    let node = eval_numeric_args(adapter, machine, stdin, node)?;
    let node = node.map(|n| n.into_iter().reduce(f));

    Ok(node.into())
}