Parse if-statement

examples/test.lua

@@ -1,7 +1,7 @@
 function max (a, b)
     local m = a
-    -- if b > a then
-    --    m = b
-    -- end
+    if a then
+       local m = b
+    end
     return m
 end

src/ast.rs

@@ -203,6 +203,7 @@ impl Parse for Block {
 pub enum Statement {
     Assignment(Option<DefinitionKind>, Node<String>, Node<Expression>),
     Return(Node<Expression>),
+    If(Node<Expression>, Block),
 }
 
 impl Parse for Statement {
@@ -211,6 +212,13 @@ impl Parse for Statement {
         if peeked == Some(Token::Keyword(Keyword::Return)) {
             stream.next();
             Ok(Statement::Return(stream.parse()?))
+        } else if peeked == Some(Token::Keyword(Keyword::If)) {
+            stream.next(); // Consume if
+            let cond = stream.parse()?;
+            stream.expect(Token::Keyword(Keyword::Then))?;
+            let then = stream.parse()?;
+            stream.expect(Token::Keyword(Keyword::End))?;
+            Ok(Self::If(cond, then))
         } else if peeked == Some(Token::Keyword(Keyword::Local)) {
             stream.next();
             let name = stream.parse()?;

src/main.rs

@@ -18,6 +18,8 @@ fn main() {
     let tokens = tokenize(TEST).unwrap();
     let mut stream = TokenStream::from(&file_path, &tokens);
 
+    dbg!(&tokens);
+
     let mut functions = Vec::new();
     while stream.peek() != Some(Token::Eof) {
         functions.push(stream.parse::<Function>().unwrap());

src/token_stream/lexer.rs

@@ -13,6 +13,8 @@ pub enum Keyword {
     End,
     Local,
     Return,
+    If,
+    Then,
 }
 
 impl Keyword {
@@ -22,6 +24,8 @@ impl Keyword {
             "end" => Keyword::End,
             "local" => Keyword::Local,
             "return" => Keyword::Return,
+            "if" => Keyword::If,
+            "then" => Keyword::Then,
             _ => None?,
         })
     }
@@ -34,6 +38,8 @@ impl ToString for Keyword {
             Keyword::End => "end",
             Keyword::Local => "local",
             Keyword::Return => "return",
+            Keyword::If => "if",
+            Keyword::Then => "then",
         }
         .to_string()
     }