Ast: fix big float prints

params.toml

@@ -1,7 +1,7 @@
 [global_flow]
-    gen_decl = 0.5
+    gen_decl = 0.6
     gen_subroutine = 0.0
-    gen_typedef = 0.4
+    gen_typedef = 0.3
     end_generation = 0.1
 
 [statements]

src/ast/expr.rs

@@ -56,7 +56,19 @@ impl ToString for Literal {
     fn to_string(&self) -> String {
         match *self {
             Literal::Int(x) => x.to_string(),
-            Literal::Real(x) => x.to_string(),
+            Literal::Real(x) => {
+                let mut s = x.to_string();
+                let nb_zeros = s.chars().rev().position(|x| x != '0').unwrap_or(0);
+
+                if nb_zeros > 3 {
+                    s = String::from(&s[..s.len()-nb_zeros]);
+                    s.push('e');
+                    s.push('+');
+                    s.push_str(&nb_zeros.to_string());
+                }
+
+                s
+            }
         }
     }
 }