Add token-based PEG frontend and CLI source parsing

crates/cli/tests/parse.rs

@@ -0,0 +1,67 @@
+use std::path::PathBuf;
+use std::process::Command;
+use std::sync::atomic::{AtomicUsize, Ordering};
+
+static NEXT_FILE: AtomicUsize = AtomicUsize::new(0);
+
+struct SourceFile(PathBuf);
+
+impl SourceFile {
+    fn new(content: &[u8]) -> Self {
+        let path = std::env::temp_dir().join(format!(
+            "aster-parse-{}-{}.endor",
+            std::process::id(),
+            NEXT_FILE.fetch_add(1, Ordering::Relaxed)
+        ));
+        std::fs::write(&path, content).unwrap();
+        Self(path)
+    }
+}
+
+impl Drop for SourceFile {
+    fn drop(&mut self) {
+        let _ = std::fs::remove_file(&self.0);
+    }
+}
+
+#[test]
+fn parse_command_prints_ast_without_executing_source() {
+    let source = SourceFile::new("function 表示(): String { return 未定義() }".as_bytes());
+    let output = Command::new(env!("CARGO_BIN_EXE_cli"))
+        .arg("parse")
+        .arg(&source.0)
+        .output()
+        .unwrap();
+    assert!(
+        output.status.success(),
+        "{}",
+        String::from_utf8_lossy(&output.stderr)
+    );
+    let stdout = String::from_utf8(output.stdout).unwrap();
+    assert!(stdout.contains("表示"));
+    assert!(stdout.contains("未定義"));
+    assert!(stdout.contains("Call"));
+}
+
+#[test]
+fn parse_command_reports_source_locations_and_rejects_invalid_utf8() {
+    let source = SourceFile::new(b"function f(): Number {\n  return )\n}");
+    let output = Command::new(env!("CARGO_BIN_EXE_cli"))
+        .arg("parse")
+        .arg(&source.0)
+        .output()
+        .unwrap();
+    assert!(!output.status.success());
+    assert!(output.stdout.is_empty());
+    let stderr = String::from_utf8(output.stderr).unwrap();
+    assert!(stderr.contains(":2:10:"), "{stderr}");
+    assert!(stderr.contains("expected"));
+    let source = SourceFile::new(&[0xff]);
+    let output = Command::new(env!("CARGO_BIN_EXE_cli"))
+        .arg("parse")
+        .arg(&source.0)
+        .output()
+        .unwrap();
+    assert!(!output.status.success());
+    assert!(output.stdout.is_empty());
+}