feat: Implement variables and simplify syntax

README.md

@@ -24,8 +24,12 @@ This is the entry point of the program. It must be the first line of your code.
 
 This is the exit point of the program. It must be the last line of your code.
 
-### `Matteeeo bambini gusini "<message>"`
+### `Matteeeo <value>`
 
-This command prints a message to the console. The message must be enclosed in double quotes.
+This command prints a value to the console. The value can be a string literal (enclosed in double quotes) or a variable.
 
-## Ciao!
+### `Biscottini <variable_name> <value>`
+
+This command declares a variable and assigns a value to it. The value can be a string literal or a number.
+
+## Ciao!

hello_world.tralla

@@ -1,3 +1,3 @@
 Tralalero Tralala
-Matteeeo bambini gusini "Hello, World!"
+Matteeeo "Hello, World!"
-Bombardiro Crocodilo
+Bombardiro Crocodilo

src/main.rs

@@ -1,5 +1,6 @@
 use std::env;
 use std::fs;
+use std::collections::HashMap;
 
 fn main() {
     let args: Vec<String> = env::args().collect();
@@ -23,20 +24,31 @@ fn main() {
         return;
     }
 
+    let mut variables: HashMap<String, String> = HashMap::new();
+
     for line in lines.iter().skip(1).rev().skip(1).rev() {
-        parse_and_execute(line);
+        parse_and_execute(line, &mut variables);
     }
 }
 
-fn parse_and_execute(line: &str) {
+fn parse_and_execute(line: &str, variables: &mut HashMap<String, String>) {
-    if line.starts_with("Matteeeo bambini gusini") {
+    let mut words = line.split_whitespace();
-        let parts: Vec<&str> = line.splitn(2, ' ').collect();
+    if let Some(keyword) = words.next() {
-        if parts.len() > 1 {
+        if keyword == "Biscottini" {
-            let string_to_print = parts[1]
+            if let Some(var_name) = words.next() {
-                .trim_start_matches("bambini gusini")
+                let value = words.collect::<Vec<&str>>().join(" ");
-                .trim()
+                variables.insert(var_name.to_string(), value.trim_matches('"').to_string());
-                .trim_matches('"');
+            }
-            println!("{}", string_to_print);
+        } else if keyword == "Matteeeo" {
+            if let Some(expression) = words.next() {
+                if expression.starts_with('"') && expression.ends_with('"') {
+                    println!("{}", expression.trim_matches('"'));
+                } else {
+                    if let Some(value) = variables.get(expression) {
+                        println!("{}", value);
+                    }
+                }
+            }
         }
     }
-}
+}

variables.tralla

@@ -0,0 +1,4 @@
+Tralalero Tralala
+Biscottini my_variable "Hello from a variable!"
+Matteeeo my_variable
+Bombardiro Crocodilo