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use crate::gen::include::HEADER;
use crate::gen::out::Content;
pub(super) fn write(out: &mut Content, needed: bool, guard: &str) {
let ifndef = format!("#ifndef {}", guard);
let define = format!("#define {}", guard);
let endif = format!("#endif // {}", guard);
let mut offset = 0;
loop {
let begin = find_line(offset, &ifndef);
let end = find_line(offset, &endif);
if let (Some(begin), Some(end)) = (begin, end) {
if !needed {
return;
}
out.next_section();
if offset == 0 {
writeln!(out, "{}", ifndef);
writeln!(out, "{}", define);
}
for line in HEADER[begin + ifndef.len()..end].trim().lines() {
if line != define && !line.trim_start().starts_with("//") {
writeln!(out, "{}", line);
}
}
offset = end + endif.len();
} else if offset == 0 {
panic!("not found in cxx.h header: {}", guard)
} else {
writeln!(out, "{}", endif);
return;
}
}
}
fn find_line(mut offset: usize, line: &str) -> Option<usize> {
loop {
offset += HEADER[offset..].find(line)?;
let rest = &HEADER[offset + line.len()..];
if rest.starts_with('\n') || rest.starts_with('\r') {
return Some(offset);
}
offset += line.len();
}
}
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