1 files changed, 29 insertions, 0 deletions
diff --git a/clox/src/scanner.c b/clox/src/scanner.c
index 2bcabb8..e125a99 100644
--- a/clox/src/scanner.c
+++ b/clox/src/scanner.c
@@ -17,3 +17,32 @@ void initScanner(const char *source) {
   scanner.current = source;
   scanner.line = 1;
 }
+
+static bool isAtEnd() { return *scanner.current == '\0'; }
+
+static Token makeToken(TokenType type) {
+  Token token;
+  token.type = type;
+  token.start = scanner.start;
+  token.length = (int)(scanner.current - scanner.start);
+  token.line = scanner.line;
+  return token;
+}
+
+static Token errorToken(const char *message) {
+  Token token;
+  token.type = TOKEN_ERROR;
+  token.start = message;
+  token.length = (int)strlen(message);
+  token.line = scanner.line;
+  return token;
+}
+
+Token scanToken() {
+  scanner.start = scanner.current;
+
+  if (isAtEnd())
+    return makeToken(TOKEN_EOF);
+
+  return errorToken("Unexpected character.");
+}