Avoid a '../' #include in test scanner

Author: maxbrunsfeld

test/fixtures/test_grammars/external_and_internal_anonymous_tokens/scanner.c

@@ -1,4 +1,9 @@
-#include "../external_and_internal_tokens/scanner.c"
+#include <tree_sitter/parser.h>
+
+enum {
+  STRING,
+  LINE_BREAK
+};
 
 void *tree_sitter_external_and_internal_anonymous_tokens_external_scanner_create() {
   return NULL;
@@ -28,9 +33,38 @@ bool tree_sitter_external_and_internal_anonymous_tokens_external_scanner_scan(
   TSLexer *lexer,
   const bool *whitelist
 ) {
-  return tree_sitter_external_and_internal_tokens_external_scanner_scan(
-    payload,
-    lexer,
-    whitelist
-  );
+  // If a line-break is a valid lookahead token, only skip spaces.
+  if (whitelist[LINE_BREAK]) {
+    while (lexer->lookahead == ' ' || lexer->lookahead == '\r') {
+      lexer->advance(lexer, true);
+    }
+
+    if (lexer->lookahead == '\n') {
+      lexer->advance(lexer, false);
+      lexer->result_symbol = LINE_BREAK;
+      return true;
+    }
+  }
+
+  // If a line-break is not a valid lookahead token, skip line breaks as well
+  // as spaces.
+  if (whitelist[STRING]) {
+    while (lexer->lookahead == ' ' || lexer->lookahead == '\r' || lexer->lookahead == '\n') {
+      lexer->advance(lexer, true);
+    }
+
+    if (lexer->lookahead == '\'') {
+      lexer->advance(lexer, false);
+
+      while (lexer->lookahead != '\'') {
+        lexer->advance(lexer, false);
+      }
+
+      lexer->advance(lexer, false);
+      lexer->result_symbol = STRING;
+      return true;
+    }
+  }
+
+  return false;
 }