Added FileInfo struct

SLS_C/include/sls/lexer.h

@@ -107,6 +107,7 @@ typedef struct LexerTokenResult {
         Token result;
         SlsError error;
     };
+    FileInfo file_info;
     struct LexerTokenResult *next;
 } LexerTokenResult;
 

SLS_C/include/sls/sls_errors.h

@@ -16,4 +16,12 @@ typedef enum {
     SLS_RESULT,
 } SlsResultType;
 
+typedef struct {
+    const char *filename;
+    size_t line;
+    size_t column;
+    size_t length;
+    size_t lines;
+} FileInfo;
+
 #endif // SLS_ERROR_H