refactor: 清除旧代码并展开 crate

crates/oxide_compiler/src/stmt/basic/expression.rs

@@ -0,0 +1,21 @@
+use crate::compiler::{CompileCtx, Compiler};
+use oxide_parser::Statement;
+
+impl Compiler {
+    pub(super) fn count_expression_statement(
+        &self, stmt: &oxide_parser::ExpressionStatement<'_>, ctx: &mut CompileCtx,
+    ) {
+        self.count_expression(&stmt.expression, ctx);
+    }
+
+    fn emit_expression_statement(&self, stmt: &Statement, ctx: &mut CompileCtx) -> Result<Option<u8>, String> {
+        let Statement::ExpressionStatement(es) = stmt else {
+            return Ok(None);
+        };
+        Ok(Some(self.emit_expression(&es.expression, ctx)?))
+    }
+
+    pub(crate) fn emit_basic_expression(&self, stmt: &Statement, ctx: &mut CompileCtx) -> Result<Option<u8>, String> {
+        self.emit_expression_statement(stmt, ctx)
+    }
+}