lab4

src/cli.rs

@@ -23,6 +23,10 @@ pub enum Command {
         input: PathBuf,
         output_tree: PathBuf,
     },
+    Sem {
+        input: PathBuf,
+        output_tree: PathBuf,
+    },
 }
 
 impl Args {
@@ -55,6 +59,7 @@ fn validate_inner(args: ArgsInner) -> Result<ArgsInner, clap::Error> {
             output_symbols,
         } => validate_lex(input, output_tokens, output_symbols)?,
         Command::Syn { input, output_tree } => validate_syn(input, output_tree)?,
+        Command::Sem { input, output_tree } => validate_sem(input, output_tree)?,
     };
 
     Ok(args)
@@ -106,3 +111,21 @@ fn validate_syn(input: &PathBuf, output_tree: &PathBuf) -> Result<(), clap::Erro
 
     Ok(())
 }
+
+fn validate_sem(input: &PathBuf, output_tree: &PathBuf) -> Result<(), clap::Error> {
+    if !input.is_file() {
+        return Err(clap::Error::raw(
+            clap::error::ErrorKind::InvalidValue,
+            format!("Input file '{}' does not exist", input.display()),
+        ));
+    }
+
+    if output_tree == input {
+        return Err(clap::Error::raw(
+            clap::error::ErrorKind::InvalidValue,
+            "Input and output files cannot be the same",
+        ));
+    };
+
+    Ok(())
+}