implement "if" statements with 2 operands + 1 operator

src/var.rs

@@ -4,6 +4,13 @@ use std::env;
 
 pub const SCOPE_SEPARATOR: &str = "$";
 
+pub const TOKEN_EQUALS: &str = "==";
+pub const TOKEN_EQUALS_NOT: &str = "!=";
+pub const TOKEN_GREATER_THAN: &str = ">";
+pub const TOKEN_LESS_THAN: &str = "<";
+pub const TOKEN_GREATER_EQUALS: &str = ">=";
+pub const TOKEN_LESS_EQUALS: &str = "<=";
+
 pub const DEFAULT_CHAT_SPEED: f32 = 10.0;
 
 #[derive(Resource)]
@@ -281,7 +288,10 @@ impl GameVars {
 
     pub fn evaluate_condition(&self, condition: &str, scope: &str) -> bool {
         let parts: Vec<&str> = condition.split(" ").collect();
-        if parts.len() == 1 {
+        if parts.len() == 0 {
+            // Got an empty string, this is always false.
+            return false;
+        } else if parts.len() == 1 {
             // Got something like "if $somevar:".
             // Check whether the variable evaluates to true.
             let part = parts[0];
@@ -309,12 +319,67 @@ impl GameVars {
                     .get(Self::normalize_varname(scope, right.as_str()).as_str())
                     .unwrap_or("".to_string());
             }
-            dbg!(&left);
-            dbg!(&right);
-            dbg!(left == right);
             return left == right;
         } else {
+            // Got something like "if $something != somethingelse bla bla"
+            let mut left: String = parts[0].to_string();
+            if left.contains(SCOPE_SEPARATOR) {
+                left = self
+                    .get(Self::normalize_varname(scope, left.as_str()).as_str())
+                    .unwrap_or("".to_string());
+            }
+
+            let mut right: String = parts[2..parts.len()].join(" ").to_string();
+            if right.contains(SCOPE_SEPARATOR) {
+                right = self
+                    .get(Self::normalize_varname(scope, right.as_str()).as_str())
+                    .unwrap_or("".to_string());
+            }
+            let floats = (left.parse::<f64>(), right.parse::<f64>());
+            let operator: &str = parts[1];
+
+            match operator {
+                TOKEN_EQUALS => {
+                    if let (Ok(left), Ok(right)) = floats {
+                        return left == right;
+                    }
+                    return left == right;
+                }
+                TOKEN_EQUALS_NOT => {
+                    if let (Ok(left), Ok(right)) = floats {
+                        return left != right;
+                    }
+                    return left != right;
+                }
+                TOKEN_GREATER_THAN => {
+                    if let (Ok(left), Ok(right)) = floats {
+                        return left > right;
+                    }
+                    return false;
+                }
+                TOKEN_GREATER_EQUALS => {
+                    if let (Ok(left), Ok(right)) = floats {
+                        return left >= right;
+                    }
+                    return false;
+                }
+                TOKEN_LESS_THAN => {
+                    if let (Ok(left), Ok(right)) = floats {
+                        return left < right;
+                    }
+                    return false;
+                }
+                TOKEN_LESS_EQUALS => {
+                    if let (Ok(left), Ok(right)) = floats {
+                        return left <= right;
+                    }
+                    return false;
+                }
+                _ => {
+                    error!("Unknown operator '{operator}' in if-condition!");
                     return false;
                 }
             }
+        }
+    }
 }