lexer: add error

3 files changed, 14 insertions, 1 deletions

diff --git a/include/lexer.h b/include/lexer.h
index c8cd1a3..6d182c3 100644
--- a/include/lexer.h
+++ b/include/lexer.h
@@ -15,6 +15,7 @@ private:
   size_t m_current;
   size_t m_end;
   size_t m_line;
+  bool m_errored;
 
 private:
   bool at_end(void);
diff --git a/src/lexer.cc b/src/lexer.cc
index a11adb3..d0840f2 100644
--- a/src/lexer.cc
+++ b/src/lexer.cc
@@ -18,6 +18,8 @@ Lexer::init(char *script)
   m_current = 0;
   m_end = strlen(m_script);
   m_line = 1;
+
+  m_errored = false;
 }
 
 List *
@@ -28,6 +30,9 @@ Lexer::scan(void)
     scan_token();
   }
 
+  if (m_errored)
+    return NULL;
+
   Token token_eof;
   token_eof.init(EOFF, "EOF", m_line);
   m_tokens->add(&token_eof);
@@ -137,6 +142,7 @@ Lexer::scan_token(void)
 
   default:
     printf("[-] Error: Unexpected character %c in line %lu\n", c, m_line);
+    m_errored = true;
     break;
   }
 }
diff --git a/src/main.cc b/src/main.cc
index 61d853b..c6dcb81 100644
--- a/src/main.cc
+++ b/src/main.cc
@@ -31,7 +31,14 @@ main(int argc, char **argv)
   Lexer l;
   l.init(buffer);
 
+  f.close();
+
   List *tokens = l.scan();
+  if (tokens == NULL) {
+    l.clean();
+    return 1;
+  }
+
   for (size_t i = 0; i < tokens->size(); i++) {
     Token *t = (Token *) tokens->get(i);
     printf("%s\n", t->to_string());
@@ -39,6 +46,5 @@ main(int argc, char **argv)
 
   l.clean();
 
-  f.close();
   return 0;
 }