feat(ast): adicionar suporte a if/else na AST

Author: Liviarodrigues1

src/ast.c

@@ -270,6 +270,12 @@ void ast_stmt_destroy(AstStmt *stmt)
 		ast_stmt_destroy(stmt->data.for_stmt.post);
 		ast_stmt_destroy(stmt->data.for_stmt.body);
 		break;
+	case STMT_IF:
+		ast_expr_destroy(stmt->data.if_stmt.condition);
+		ast_stmt_destroy(stmt->data.if_stmt.then_branch);
+		if (stmt->data.if_stmt.else_branch)
+			ast_stmt_destroy(stmt->data.if_stmt.else_branch);
+		break;
 	case STMT_EXPR:
 	case STMT_RETURN:
 		if (stmt->data.expr)
@@ -377,6 +383,16 @@ AstStmt *ast_stmt_make_for(AstStmt *init, AstExpr *condition, AstStmt *post, Ast
 	return stmt;
 }
 
+AstStmt *ast_stmt_make_if(AstExpr *condition, AstStmt *then_branch, AstStmt *else_branch)
+{
+	AstStmt *stmt = xcalloc(1, sizeof(AstStmt));
+	stmt->kind = STMT_IF;
+	stmt->data.if_stmt.condition = condition;
+	stmt->data.if_stmt.then_branch = then_branch;
+	stmt->data.if_stmt.else_branch = else_branch;
+	return stmt;
+}
+
 AstStmt *ast_stmt_make_expr(AstExpr *expr)
 {
 	AstStmt *stmt = xcalloc(1, sizeof(AstStmt));

src/ast.h

@@ -145,6 +145,7 @@ typedef struct AstStmt
 		STMT_ARRAY_ASSIGN,
 		STMT_WHILE,
 		STMT_FOR,
+		STMT_IF,     
 		STMT_EXPR,
 		STMT_RETURN
 	} kind;
@@ -188,6 +189,14 @@ typedef struct AstStmt
 			struct AstStmt *post;
 			struct AstStmt *body;
 		} for_stmt;
+
+		struct
+		{
+			AstExpr *condition;
+			struct AstStmt *then_branch;
+			struct AstStmt *else_branch; 
+		} if_stmt;
+
 		AstExpr *expr;
 	} data;
 } AstStmt;
@@ -234,6 +243,7 @@ AstStmt *ast_stmt_make_array_decl(TypeKind type, char *name, size_t size, AstExp
 AstStmt *ast_stmt_make_array_assign(char *name, AstExpr *index, AstExpr *value);
 AstStmt *ast_stmt_make_while(AstExpr *condition, AstStmt *body);
 AstStmt *ast_stmt_make_for(AstStmt *init, AstExpr *condition, AstStmt *post, AstStmt *body);
+AstStmt *ast_stmt_make_if(AstExpr *condition, AstStmt *then_branch, AstStmt *else_branch);
 AstStmt *ast_stmt_make_expr(AstExpr *expr);
 AstStmt *ast_stmt_make_return(AstExpr *expr);
 AstExpr *ast_expr_make_array_literal(AstExprList *elements);