feat(furc/parser): add while statement

furc/include/furc/front/ast.hpp

@@ -53,6 +53,7 @@ public:
 
         Compound,
         If,
+        While,
         Return,
     };
 public:
@@ -77,6 +78,13 @@ struct if_stmt_node final : public stmt_node {
     stmt_node* elseBranch = nullptr;
 };
 
+struct while_stmt_node final : public stmt_node {
+    stmt_type_e stmt_type() const override { return While; }
+
+    expr_node* cond = nullptr;
+    stmt_node* body = nullptr;
+};
+
 struct return_stmt_node final : public stmt_node {
     stmt_type_e stmt_type() const override { return Return; }
 

furc/src/front/parser.cpp

@@ -46,6 +46,15 @@ stmt_node* parser::parse_stmt() {
         }
         return m_arena->allocate<if_stmt_node>(std::move(node));
     }
+    case token::While: {
+        m_lexer.next_token();
+        eat_token(token::LParen);
+        while_stmt_node node;
+        node.cond = parse_expr();
+        eat_token(token::RParen);
+        node.body = parse_stmt();
+        return m_arena->allocate<while_stmt_node>(std::move(node));
+    }
     default: break;
     }
 

furc/src/main.cpp

@@ -5,7 +5,15 @@
 int main(void) {
     furlang::arena arena;
 
-    furc::lexer  lexer  = { "<AK>", "func main(argc: u64) -> s32 { x: s32 = 10 + 67 - 6 * 7; }" };
+    std::string_view content = R"(
+        func main(argc: u64) -> s32 {
+            x: s32 = 1 + 2 * 3;
+            if (x == 9) return 1;
+            else return 0;
+        }
+    )";
+
+    furc::lexer  lexer  = { "<AK>", content };
     furc::parser parser = { std::move(lexer), arena };
 
     auto program = parser.parse();