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use eyre::{Result, WrapErr};
use std::io::{BufRead, Cursor};
use std::rc::Rc;
use super::{FinishedMakefileReader, MacroSet, MakefileReader};
pub struct DeferredEvalContext<'parent, 'args, 'grandparent, R: BufRead> {
parent: &'parent MakefileReader<'args, 'grandparent, R>,
children: Vec<FinishedMakefileReader>,
}
impl<'parent, 'args, 'grandparent, R: BufRead>
DeferredEvalContext<'parent, 'args, 'grandparent, R>
{
pub const fn new(parent: &'parent MakefileReader<'args, 'grandparent, R>) -> Self {
Self {
parent,
children: Vec::new(),
}
}
pub fn push(&mut self, child: FinishedMakefileReader) {
self.children.push(child);
}
pub fn eval(&mut self, to_eval: String) -> Result<()> {
let child_stack = self.parent.stack.with_scope(&self.parent.macros);
let child_macros = MacroSet::new();
let child = MakefileReader::read(
self.parent.args,
child_stack,
child_macros,
Cursor::new(to_eval),
"<eval>",
Rc::clone(&self.parent.file_names),
)
.context("while evaling")?
.finish();
self.push(child);
Ok(())
}
}
impl<'parent, 'args, 'grandparent, R: BufRead> IntoIterator
for DeferredEvalContext<'parent, 'args, 'grandparent, R>
{
type Item = FinishedMakefileReader;
type IntoIter = std::vec::IntoIter<Self::Item>;
fn into_iter(self) -> Self::IntoIter {
self.children.into_iter()
}
}
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