-gboolean
-execute_syntax (struct getl_interface *sss)
-{
- struct lexer *lexer;
- gboolean retval = TRUE;
-
- struct casereader *reader;
- size_t value_cnt;
- casenumber case_cnt;
- unsigned long int lazy_serial;
-
- /* When the user executes a number of snippets of syntax in a
- row, none of which read from the active file, the GUI becomes
- progressively less responsive. The reason is that each syntax
- execution encapsulates the active file data in another
- datasheet layer. The cumulative effect of having a number of
- layers of datasheets wastes time and space.
-
- To solve the problem, we use a "lazy casereader", a wrapper
- around the casereader obtained from the data store, that
- only actually instantiates that casereader when it is
- needed. If the data store casereader is never needed, then
- it is reused the next time syntax is run, without wrapping
- it in another layer. */
- value_cnt = psppire_data_store_get_value_count (the_data_store);
- case_cnt = psppire_data_store_get_case_count (the_data_store);
- reader = lazy_casereader_create (value_cnt, case_cnt,
- create_casereader_from_data_store,
- the_data_store, &lazy_serial);
- proc_set_active_file_data (the_dataset, reader);
-
- g_return_val_if_fail (proc_has_active_file (the_dataset), FALSE);
-
- lexer = lex_create (the_source_stream);
-
- getl_append_source (the_source_stream, sss, GETL_BATCH, ERRMODE_CONTINUE);
-
- for (;;)
- {
- enum cmd_result result = cmd_parse (lexer, the_dataset);