Init.

2 files changed, 163 insertions, 0 deletions

diff --git a/rust-book/blog/src/lib.rs b/rust-book/blog/src/lib.rs
new file mode 100755
index 0000000..8436a36
--- /dev/null
+++ b/rust-book/blog/src/lib.rs
@@ -0,0 +1,127 @@
+//pub struct Post {
+//    state: Option<Box<dyn State>>,
+//    content: String,
+//}
+//
+//impl Post {
+//    pub fn new() -> Post {
+//        Post {
+//            state: Some(Box::new(Draft {})),
+//            content: String::new(),
+//        }
+//    }
+//
+//    pub fn add_text(&mut self, text: &str) {
+//        self.content.push_str(text);
+//    }
+//
+//    pub fn content(&self) -> &str {
+//        self.state.as_ref().unwrap().content(&self)
+//    }
+//
+//    pub fn request_review(&mut self) {
+//        if let Some(s) = self.state.take() {
+//            self.state = Some(s.request_review())
+//        }
+//    }
+//
+//    pub fn approve(&mut self) {
+//        if let Some(s) = self.state.take() {
+//            self.state = Some(s.approve())
+//        }
+//    }
+//}
+//
+//trait State {
+//    fn request_review(self: Box<Self>) -> Box<dyn State>;
+//    fn approve(self: Box<Self>) -> Box<dyn State>;
+//    fn content<'a>(&self, post: &'a Post) -> &'a str {
+//        ""
+//    }
+//}
+//
+//struct Draft {}
+//
+//impl State for Draft {
+//    fn request_review(self: Box<Self>) -> Box<dyn State> {
+//        Box::new(PendingReview {})
+//    }
+//
+//    fn approve(self: Box<Self>) -> Box<dyn State> {
+//        self
+//    }
+//}
+//
+//struct PendingReview {}
+//
+//impl State for PendingReview {
+//    fn request_review(self: Box<Self>) -> Box<dyn State> {
+//        self
+//    }
+//
+//    fn approve(self: Box<Self>) -> Box<dyn State> {
+//        Box::new(Published {})
+//    }
+//}
+//
+//struct Published {}
+//
+//impl State for Published {
+//    fn request_review(self: Box<Self>) -> Box<dyn State> {
+//        self
+//    }
+//
+//    fn approve(self: Box<Self>) -> Box<dyn State> {
+//        self
+//    }
+//
+//    fn content<'a>(&self, post: &'a Post) -> &'a str {
+//        &post.content
+//    }
+//}
+
+
+
+pub struct Post {
+    content: String,
+}
+
+pub struct DraftPost {
+    content: String,
+}
+
+pub struct PendingReviewPost {
+    content: String,
+}
+
+impl Post {
+    pub fn new() -> DraftPost {
+        DraftPost {
+            content: String::new(),
+        }
+    }
+
+    pub fn content(&self) -> &str {
+        &self.content
+    }
+}
+
+impl DraftPost {
+    pub fn add_text(&mut self, text: &str) {
+        self.content.push_str(text);
+    }
+
+    pub fn request_review(self) -> PendingReviewPost {
+        PendingReviewPost {
+            content: self.content,
+        }
+    }
+}
+
+impl PendingReviewPost {
+    pub fn approve(self) -> Post {
+        Post {
+            content: self.content,
+        }
+    }
+}
diff --git a/rust-book/blog/src/main.rs b/rust-book/blog/src/main.rs
new file mode 100755
index 0000000..c976cd9
--- /dev/null
+++ b/rust-book/blog/src/main.rs
@@ -0,0 +1,36 @@
+use blog::Post;
+
+fn main() {
+//    let mut post = Post::new();
+//
+//    post.add_text("salad");
+//    assert_eq!("", post.content());
+//
+//    post.request_review();
+//    assert_eq!("", post.content());
+//
+//    post.approve();
+//    assert_eq!("salad", post.content());
+
+
+
+//    let mut post = Post::new();
+//    post.add_text("salad");
+//    assert_eq!("", post.content());
+
+
+
+    let mut post = Post::new();
+
+    post.add_text("salad");
+    let post = post.request_review();
+    let post = post.approve();
+
+    assert_eq!("salad", post.content());
+
+
+
+
+
+    println!("Done.");
+}