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use std::fmt::Write;
use {
algo::walk::{walk, WalkEvent},
SyntaxNodeRef, TreeRoot,
};
/// Parse a file and create a string representation of the resulting parse tree.
pub fn dump_tree(syntax: SyntaxNodeRef) -> String {
let mut errors: Vec<_> = syntax.root.syntax_root().errors.iter().cloned().collect();
errors.sort_by_key(|e| e.offset);
let mut err_pos = 0;
let mut level = 0;
let mut buf = String::new();
macro_rules! indent {
() => {
for _ in 0..level {
buf.push_str(" ");
}
};
}
for event in walk(syntax) {
match event {
WalkEvent::Enter(node) => {
indent!();
writeln!(buf, "{:?}", node).unwrap();
if node.first_child().is_none() {
let off = node.range().end();
while err_pos < errors.len() && errors[err_pos].offset <= off {
indent!();
writeln!(buf, "err: `{}`", errors[err_pos].msg).unwrap();
err_pos += 1;
}
}
level += 1;
}
WalkEvent::Exit(_) => level -= 1,
}
}
assert_eq!(level, 0);
for err in errors[err_pos..].iter() {
writeln!(buf, "err: `{}`", err.msg).unwrap();
}
return buf;
}
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