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, 11 insertions, 0 deletions

diff --git a/src/lexer.c b/src/lexer.c
index 2c8ffb9..b641752 100644
--- a/src/lexer.c
+++ b/src/lexer.c
@@ -44,6 +44,7 @@ lexer_define_literal_token_props(lexer_t *lexer, token_t *token, token_kind_t ki
   token->filepath = lexer->filepath;
   token->row = lexer->row;
   token->col = lexer->cur - lexer->bol;
+  token->bol = lexer->bol;
 }
 
 static void
@@ -73,6 +74,7 @@ lexer_tokenize_number(lexer_t *lexer, token_t *token)
   token->filepath = lexer->filepath;
   token->row = lexer->row;
   token->col = begin - lexer->bol;
+  token->bol = lexer->bol;
 }
 
 static void
@@ -88,6 +90,7 @@ lexer_tokenize_name(lexer_t *lexer, token_t *token)
   token->filepath = lexer->filepath;
   token->row = lexer->row;
   token->col = begin - lexer->bol;
+  token->bol = lexer->bol;
 }
 
 void
@@ -197,6 +200,14 @@ lexer_load_file_contents(lexer_t *lexer)
 }
 
 void
+lexer_step_back_to(lexer_t *lexer, token_t *token)
+{
+  lexer->cur = token->bol + token->col;
+  lexer->row = token->row;
+  lexer->bol = token->bol;
+}
+
+void
 lexer_drop_char(lexer_t *lexer)
 {
   lexer->cur++;