Add trait

src/elements/subword.rs

@@ -3,3 +3,23 @@
 
 pub mod unquoted;
 
+use crate::{Feeder, ShellCore};
+use super::subword::unquoted::UnquotedSubword;
+use std::fmt;
+use std::fmt::Debug;
+
+impl Debug for dyn Subword {
+    fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
+        fmt.debug_struct(&self.get_text()).finish()
+    }
+}
+
+pub trait Subword {
+    fn get_text(&self) -> String;
+    fn eval(&mut self) -> Vec<Vec<String>>;
+}
+
+pub fn parse(feeder: &mut Feeder, core: &mut ShellCore) -> Option<Box<dyn Subword>> {
+    if let Some(a) = UnquotedSubword::parse(feeder, core){ Some(Box::new(a)) }
+    else{ None }
+}

src/elements/subword/unquoted.rs

@@ -2,12 +2,18 @@
 //SPDX-License-Identifier: BSD-3-Clause
 
 use crate::{ShellCore, Feeder};
+use crate::elements::subword::Subword;
 
 #[derive(Debug)]
 pub struct UnquotedSubword {
     pub text: String,
 }
 
+impl Subword for UnquotedSubword {
+    fn get_text(&self) -> String { self.text.clone() }
+    fn eval(&mut self) -> Vec<Vec<String>> { vec![vec![self.text.clone()]] }
+}
+
 impl UnquotedSubword {
     fn new() -> UnquotedSubword {
         UnquotedSubword {

src/elements/word.rs

@@ -2,12 +2,13 @@
 //SPDX-License-Identifier: BSD-3-Clause
 
 use crate::{Feeder, ShellCore};
-use crate::elements::subword::unquoted::UnquotedSubword;
+use crate::elements::subword;
+use crate::elements::subword::Subword;
 
 #[derive(Debug)]
 pub struct Word {
     pub text: String,
-    pub subwords: Vec<UnquotedSubword>,
+    pub subwords: Vec<Box<dyn Subword>>,
 }
 
 impl Word {
@@ -24,8 +25,8 @@ impl Word {
 
     pub fn parse(feeder: &mut Feeder, core: &mut ShellCore) -> Option<Word> {
         let mut ans = Word::new();
-        while let Some(sw) = UnquotedSubword::parse(feeder, core) {
-            ans.text += &sw.text.clone();
+        while let Some(sw) = subword::parse(feeder, core) {
+            ans.text += &sw.get_text();
             ans.subwords.push(sw);
         }