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_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::parse;

pub(crate) fn key(
    adapter: &impl Adapter,
    machine: &mut Machine<'_>,
    stdin: Option<&Value>,
    node: Node,
) -> Result<Value, Error> {
    assert_func_arity(adapter, machine, stdin, &node, &Arity::minmax(1, 2))?;

    let mut values = eval_args(adapter, machine, stdin, node)?;
    let last = values.pop().flatten();
    let first = values.pop().flatten();

    match (first, last) {
        (None, Some(k)) => Ok(machine.map.contains_key(k.join()).into()),
        (Some(k), Some(v)) => Ok(value_contains_key(v, &k.join()).into()),
        _ => Ok(Value::default()),
    }
}

fn value_contains_key(value: Value, key: &[u8]) -> bool {
    match value {
        Value::Bytes(_) => false,
        Value::List(v) => parse::usize(key).ok().and_then(|i| v.get(i)).is_some(),
        Value::Map(v) => v.contains_key(key),
    }
}