Vendor things

third-party/vendor/swc_ecma_parser/examples/lexer.rs

@@ -0,0 +1,44 @@
+use swc_common::{
+    self,
+    errors::{ColorConfig, Handler},
+    sync::Lrc,
+    FileName, SourceMap,
+};
+use swc_ecma_parser::{lexer::Lexer, Capturing, Parser, StringInput, Syntax};
+
+fn main() {
+    let cm: Lrc<SourceMap> = Default::default();
+    let handler = Handler::with_tty_emitter(ColorConfig::Auto, true, false, Some(cm.clone()));
+
+    // Real usage
+    // let fm = cm
+    //     .load_file(Path::new("test.js"))
+    //     .expect("failed to load test.js");
+
+    let fm = cm.new_source_file(
+        FileName::Custom("test.js".into()),
+        "function foo() {}".into(),
+    );
+
+    let lexer = Lexer::new(
+        Syntax::Es(Default::default()),
+        Default::default(),
+        StringInput::from(&*fm),
+        None,
+    );
+
+    let capturing = Capturing::new(lexer);
+
+    let mut parser = Parser::new_from(capturing);
+
+    for e in parser.take_errors() {
+        e.into_diagnostic(&handler).emit();
+    }
+
+    let _module = parser
+        .parse_module()
+        .map_err(|e| e.into_diagnostic(&handler).emit())
+        .expect("Failed to parse module.");
+
+    println!("Tokens: {:?}", parser.input().take());
+}