parser: Parse integers arithmetic expression

This patch implements the AST creation for arithmetic expressions.

NOTE:

The implementation works only for integer numbers.

Signed-off-by: Johnny Richard <johnny@johnnyrichard.com>
Reviewed-by: Carlos Maniero <carlosmaniero@gmail.com>

1 files changed, 9 insertions, 0 deletions

diff --git a/src/ast.h b/src/ast.h
index 1c4bbb8..cb9b8d5 100644
--- a/src/ast.h
+++ b/src/ast.h
@@ -38,6 +38,13 @@ typedef struct ast_function_declaration_t {
   ast_node_t* body;
 } ast_function_declaration_t;
 
+typedef struct ast_binary_operation_t {
+  // FIXME: We want to use enum to distinguish operators
+  string_view_t op;
+  ast_node_t* left;
+  ast_node_t* right;
+} ast_binary_operation_t;
+
 typedef enum {
   AST_LITERAL_INTEGER
 } ast_literal_kind_t;
@@ -59,6 +66,7 @@ typedef struct ast_visitor_t {
 
 typedef enum {
   AST_FUNCTION_DECLARATION,
+  AST_BINARY_OPERATION,
   AST_LITERAL,
   AST_RETURN_STMT,
   AST_UNKOWN_NODE
@@ -66,6 +74,7 @@ typedef enum {
 
 typedef union {
   ast_function_declaration_t function;
+  ast_binary_operation_t binary_operation;
   ast_literal_t literal;
   ast_return_stmt_t return_stmt;
 } ast_node_data_t;