Generate function prototypes

builtin/builtin.c

@@ -4,7 +4,7 @@
 
 void _printf(char *msg)
 {
-    printf(msg);
+    printf("%s", msg);
 }
 
 /* END builtins */

examples/fib.sb

@@ -1,5 +1,5 @@
 fn main() {
-    let num = 10
+    let num: int = 10
     println(fib(num))
 }
 

examples/playground.sb

@@ -1,11 +1,4 @@
-fn main(n: int) {
+fn main() {
-    _printf("Hello World!\n")
+    let x: string = "Hello World\n"
-
+    _printf(x)
-    if n > 2 {
-        _printf("Larger than 2\n")
-    } else if n == 2 {
-        _printf("Is 2\n")
-    } else {
-        _printf("Less than 2\n")
-    }
 }

src/generator/c.rs

@@ -27,6 +27,11 @@ impl Generator for CGenerator {
             crate::Builtins::get("builtin.c").expect("Could not locate builtin functions");
         code += std::str::from_utf8(raw_builtins.as_ref())
             .expect("Unable to interpret builtin functions");
+
+        for func in &prog.func {
+            code += &format!("{};\n", &generate_function_signature(func.clone()));
+        }
+
         let funcs: String = prog
             .func
             .into_iter()
@@ -63,6 +68,14 @@ pub(super) fn generate_type(t: Either<Variable, Option<Type>>) -> String {
 }
 
 fn generate_function(func: Function) -> String {
+    let mut buf = String::new();
+    buf += &format!("{} ", &generate_function_signature(func.clone()));
+    buf += &generate_block(func.body);
+
+    buf
+}
+
+fn generate_function_signature(func: Function) -> String {
     let arguments: String = func
         .arguments
         .into_iter()
@@ -70,11 +83,7 @@ fn generate_function(func: Function) -> String {
         .collect::<Vec<String>>()
         .join(", ");
     let t = generate_type(Either::Right(func.ret_type));
-    let mut raw = format!("{T} {N}({A})", T = t, N = func.name, A = arguments);
+    format!("{T} {N}({A})", T = t, N = func.name, A = arguments)
-
-    raw += &generate_block(func.body);
-
-    raw
 }
 
 fn generate_block(block: Statement) -> String {

src/parser/node_type.rs

@@ -29,7 +29,7 @@ impl Program {
     }
 }
 
-#[derive(Debug)]
+#[derive(Debug, Clone)]
 pub struct Function {
     pub name: String,
     pub arguments: Vec<Variable>,
@@ -63,7 +63,7 @@ impl TryFrom<String> for Type {
     }
 }
 
-#[derive(Debug, Eq, PartialEq)]
+#[derive(Debug, Eq, PartialEq, Clone)]
 pub enum Statement {
     Block(Vec<Statement>),
     Declare(Variable, Option<Expression>),
@@ -74,7 +74,7 @@ pub enum Statement {
     Exp(Expression),
 }
 
-#[derive(Debug, Eq, PartialEq)]
+#[derive(Debug, Eq, PartialEq, Clone)]
 pub enum Expression {
     Int(u32),
     Str(String),
@@ -111,7 +111,7 @@ impl TryFrom<Token> for Expression {
     }
 }
 
-#[derive(Debug, Eq, PartialEq)]
+#[derive(Debug, Eq, PartialEq, Clone)]
 pub enum BinOp {
     Addition,
     Subtraction,