refactor "next word/string" parsing to work inside the definition without substates, add char and [char], add .\" and s\"

include/fh_error.h

@@ -26,6 +26,7 @@ enum fh_error {
   FH_ERR_ILLEGAL_FETCH,
   FH_ERR_ILLEGAL_STORE,
   FH_ERR_DIV_BY_ZERO,
+  FH_ERR_SYNTAX,
   FH_ERR_MAX,
 };
 

include/fh_runtime.h

@@ -82,15 +82,9 @@ enum fh_state {
 /** Forth runtime minor state */
 enum fh_substate {
   FH_SUBSTATE_NONE = 0,
-  FH_SUBSTATE_COLON_NAME,
-  FH_SUBSTATE_S_QUOTE,
-  FH_SUBSTATE_DOT_QUOTE,
   FH_SUBSTATE_PAREN_COMMENT,
   FH_SUBSTATE_LINE_COMMENT,
   FH_SUBSTATE_EXIT,
-  FH_SUBSTATE_SEE_NAME,
-  FH_SUBSTATE_POSTPONE_NAME,
-  FH_SUBSTATE_CHAR,
   FH_SUBSTATE_MAX,
 };
 
@@ -174,6 +168,22 @@ void fh_setsubstate(struct fh_thread_s *fh, enum fh_substate substate);
 
 enum fh_error w_user_word(struct fh_thread_s *fh, const struct fh_word_s *w);
 
+enum fh_error fh_input_read_quotedstring(struct fh_thread_s *fh, bool escaped, char *outbuf, size_t capacity, size_t *out_len);
+enum fh_error fh_input_read_word(struct fh_thread_s *fh, char **out, size_t *len);
+void fh_input_consume_spaces(struct fh_thread_s *fh);
+
+enum fh_error fh_postpone_word(
+    struct fh_thread_s *fh,
+    const char *name,
+    size_t wordlen
+);
+
+enum fh_error fh_see_word(
+    struct fh_thread_s *fh,
+    const char *name,
+    size_t wordlen
+);
+
 /* if the return address is this, we should drop back to interactive mode */
 
 // SFR and magic addresses are "negative"