Change string conversion methods

src/main.rs

@@ -51,27 +51,43 @@ fn parse_config(conf: String, pool: &mut Vec<robot::Robot>) -> Result<world::Wor
     // The first line of the config file should be the World.
     let raw_line: &str = match lines.next() {
         Some(raw) => raw,
-        None => return Err("Could not read the first line of the config file !".to_string()),
+        None => {
+            return Err(String::from(
+                "Could not read the first line of the config file !",
+            ))
+        }
     };
     let mut tokens = raw_line.split_whitespace();
     let token1 = match tokens.next() {
         Some(raw) => raw,
-        None => return Err("Could not read the first token of the first line !".to_string()),
+        None => {
+            return Err(String::from(
+                "Could not read the first token of the first line !",
+            ))
+        }
     };
     let token2 = match tokens.next() {
         Some(raw) => raw,
-        None => return Err("Could not read the second token of the first line !".to_string()),
+        None => {
+            return Err(String::from(
+                "Could not read the second token of the first line !",
+            ))
+        }
     };
     let x: i32 = match token1.parse::<i32>() {
         Ok(x) => x,
         Err(_) => {
-            return Err("Could not convert token one from the first string to i32".to_string())
+            return Err(String::from(
+                "Could not convert token one from the first string to i32",
+            ))
         }
     };
     let y: i32 = match token2.parse::<i32>() {
         Ok(x) => x,
         Err(_) => {
-            return Err("Could not convert token two from the first string to i32".to_string())
+            return Err(String::from(
+                "Could not convert token two from the first string to i32",
+            ))
         }
     };
     let w = world::World { x, y };
@@ -84,50 +100,62 @@ fn parse_config(conf: String, pool: &mut Vec<robot::Robot>) -> Result<world::Wor
             Some(x) => x,
         };
         if !empty_line.is_empty() {
-            return Err("This line should be empty !".to_string());
+            return Err(String::from("This line should be empty !"));
         }
         let raw_setup = match lines.next() {
-            None => return Err("This line should be the config !".to_string()),
+            None => return Err(String::from("This line should be the config !")),
             Some(raw) => raw,
         };
         if raw_setup.is_empty() {
-            return Err("This line should not be empty !".to_string());
+            return Err(String::from("This line should not be empty !"));
         }
         let raw_inst = match lines.next() {
-            None => return Err("This line should be the instruction !".to_string()),
+            None => return Err(String::from("This line should be the instruction !")),
             Some(raw) => raw,
         };
         if raw_inst.is_empty() {
-            return Err("This line should not be empty !".to_string());
+            return Err(String::from("This line should not be empty !"));
         }
         // Parse the setup line of the robot.
         let mut setup = raw_setup.split_whitespace();
         let pos_x = match setup.next() {
-            None => return Err("Could not read the first token of the setup line !".to_string()),
+            None => {
+                return Err(String::from(
+                    "Could not read the first token of the setup line !",
+                ))
+            }
             Some(raw) => raw,
         };
         let pos_y = match setup.next() {
-            None => return Err("Could not read the second token of the setup line !".to_string()),
+            None => {
+                return Err(String::from(
+                    "Could not read the second token of the setup line !",
+                ))
+            }
             Some(raw) => raw,
         };
         let orientation = match setup.next() {
-            None => return Err("Could not read the third token of the setup line !".to_string()),
+            None => {
+                return Err(String::from(
+                    "Could not read the third token of the setup line !",
+                ))
+            }
             Some(raw) => raw,
         };
         // Convert values of the setup line
         let r_x = match pos_x.parse::<i32>() {
             Err(_) => {
-                return Err(
+                return Err(String::from(
-                    "Could not convert the first token of the setup ligne to i32 !".to_string(),
+                    "Could not convert the first token of the setup ligne to i32 !",
-                )
+                ))
             }
             Ok(raw) => raw,
         };
         let r_y = match pos_y.parse::<i32>() {
             Err(_) => {
-                return Err(
+                return Err(String::from(
-                    "Could not convert the second token of the setup ligne to i32 !".to_string(),
+                    "Could not convert the second token of the setup ligne to i32 !",
-                )
+                ))
             }
             Ok(raw) => raw,
         };
@@ -137,14 +165,18 @@ fn parse_config(conf: String, pool: &mut Vec<robot::Robot>) -> Result<world::Wor
             "S" => robot::Orientation::S,
             "W" => robot::Orientation::W,
             _ => {
-                return Err(
+                return Err(String::from(
-                    "The third token of the setup line do not match any orientations !".to_string(),
+                    "The third token of the setup line do not match any orientations !",
-                )
+                ))
             }
         };
 
         // Convert instructions line.
         let inst: Vec<char> = raw_inst.chars().collect();
+        if !world::is_instructions(&inst) {
+            return Err(String::from("Invalid instructions !"));
+        }
+
         let r = robot::Robot::new(r_id, r_o, robot::Position { x: r_x, y: r_y }, inst);
 
         // Load robot inside the pool.