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_string_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;

pub(crate) fn replace(
    adapter: &impl Adapter,
    machine: &mut Machine<'_>,
    stdin: Option<&Value>,
    node: Node,
) -> Result<Value, Error> {
    assert_func_arity(adapter, machine, stdin, &node, &Arity::new(3))?;

    let mut args = eval_string_args(adapter, machine, stdin, node)?.unwrap_or_default();
    let value = args.pop().unwrap_or_default();
    let to = args.pop().unwrap_or_default();
    let from = args.pop().unwrap_or_default();
    let value = value.replace(&from, &to);

    Ok(value.into())
}