Vendor things

third-party/vendor/sourcemap/examples/read.rs

@@ -0,0 +1,38 @@
+use std::env;
+use std::fs;
+use std::io::Read;
+
+use sourcemap::{decode, DecodedMap, RewriteOptions, SourceMap};
+
+fn load_from_reader<R: Read>(mut rdr: R) -> SourceMap {
+    match decode(&mut rdr).unwrap() {
+        DecodedMap::Regular(sm) => sm,
+        DecodedMap::Index(idx) => idx
+            .flatten_and_rewrite(&RewriteOptions {
+                load_local_source_contents: true,
+                ..Default::default()
+            })
+            .unwrap(),
+        _ => panic!("unexpected sourcemap format"),
+    }
+}
+
+fn main() {
+    let args: Vec<_> = env::args().collect();
+    let mut f = fs::File::open(&args[1]).unwrap();
+    let sm = load_from_reader(&mut f);
+
+    let line = if args.len() > 2 {
+        args[2].parse::<u32>().unwrap()
+    } else {
+        0
+    };
+    let column = if args.len() > 3 {
+        args[3].parse::<u32>().unwrap()
+    } else {
+        0
+    };
+
+    let token = sm.lookup_token(line, column).unwrap(); // line-number and column
+    println!("token: {token}");
+}