organizize

crates/libsyntax2/src/utils.rs

@@ -0,0 +1,48 @@
+use std::fmt::Write;
+use {
+    algo::walk::{walk, WalkEvent},
+    SyntaxNode,
+};
+
+/// Parse a file and create a string representation of the resulting parse tree.
+pub fn dump_tree(syntax: &SyntaxNode) -> String {
+    let syntax = syntax.as_ref();
+    let mut errors: Vec<_> = 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;
+}