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Add first iteration of blog example

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This commit is contained in:
Timothy Warren 2019-02-06 14:54:11 -05:00
parent bac5c02bd8
commit 48e6aba776
6 changed files with 217 additions and 38 deletions
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1
.idea/misc.xml generated
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@ -34,6 +34,7 @@
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<cargoProject FILE="$PROJECT_DIR$/trait_objects/Cargo.toml" />
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5
.idea/rust.iml generated
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@ -137,9 +137,14 @@
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<sourceFolder url="file://$MODULE_DIR$/blog/examples" isTestSource="false" />
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<excludeFolder url="file://$MODULE_DIR$/add/adder/target" />
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<excludeFolder url="file://$MODULE_DIR$/branches/target" />
<excludeFolder url="file://$MODULE_DIR$/closures/target" />
<excludeFolder url="file://$MODULE_DIR$/ctof/target" />

147
.idea/workspace.xml generated
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@ -13,7 +13,48 @@
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@ -42,8 +83,6 @@
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@ -93,6 +132,8 @@
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@ -165,7 +217,7 @@
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@ -193,7 +245,7 @@
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@ -212,6 +264,16 @@
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<option name="workingDirectory" value="file://$PROJECT_DIR$/blog" />
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<option name="channel" value="DEFAULT" />
<option name="command" value="run --package gui --bin gui" />
@ -232,16 +294,6 @@
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<configuration name="Run twelve_days_of_christmas" type="CargoCommandRunConfiguration" factoryName="Cargo Command" temporary="true">
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@ -271,11 +323,11 @@
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<item itemvalue="Cargo Command.Run blog" />
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<item itemvalue="Cargo Command.Run twelve_days_of_christmas" />
<item itemvalue="Cargo Command.Run mutex" />
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@ -313,9 +365,10 @@
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@ -323,7 +376,7 @@
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@ -785,5 +820,41 @@
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7
blog/Cargo.toml Normal file
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@ -0,0 +1,7 @@
[package]
name = "blog"
version = "0.1.0"
authors = ["Timothy Warren <twarren@nabancard.com>"]
edition = "2018"
[dependencies]

81
blog/src/lib.rs Normal file
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@ -0,0 +1,81 @@
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
}
}

14
blog/src/main.rs Normal file
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@ -0,0 +1,14 @@
use blog::Post;
fn main() {
let mut post = Post::new();
post.add_text("I ate a salad for lunch today");
assert_eq!("", post.content());
post.request_review();
assert_eq!("", post.content());
post.approve();
assert_eq!("I ate a salad for lunch today", post.content());
}