feat: support cairo

LANGUAGES.md

@@ -37,6 +37,7 @@ C# (cs,csx)
 C++ (cc,cpp,cxx,c++,pcc,ino)
 C++ Header (hh,hpp,hxx,inl,ipp)
 Cabal (cabal)
+Cairo (cairo)
 Cassius (cassius)
 Ceylon (ceylon)
 Clojure (clj,cljc)

examples/language/cairo.cairo

@@ -0,0 +1,28 @@
+fn main() -> felt252 {
+    fib(16)
+}
+
+fn fib(mut n: felt252) -> felt252 {
+    let mut a: felt252 = 0;
+    let mut b: felt252 = 1;
+    loop {
+        if n == 0 {
+            break a;
+        }
+        n = n - 1;
+        let temp = b;
+        b = a + b;
+        a = temp;
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::fib;
+
+    #[test]
+    #[available_gas(100000)]
+    fn it_works() {
+        assert(fib(16) == 987, 'it works!');
+    }
+}

languages.json

@@ -1254,6 +1254,33 @@
     ],
     "quotes": []
   },
+  "Cairo": {
+      "complexitychecks": [
+        "loop ",
+        "if ",
+        "if(",
+        "match ",
+        "match(",
+        "else ",
+        "|| ",
+        "&& ",
+        "!= ",
+        "== "
+      ],
+      "extensions": [
+        "cairo"
+      ],
+      "line_comment": [
+        "//"
+      ],
+      "multi_line": [],
+      "quotes": [
+        {
+          "end": "'",
+          "start": "'"
+        }
+      ]
+  },
   "Cassius": {
     "complexitychecks": [
       "for ",