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Diffstat (limited to 'ChangeLog')
| -rw-r--r-- | ChangeLog | 35 |
1 files changed, 35 insertions, 0 deletions
@@ -1,5 +1,40 @@ 2014-02-21 Kaz Kylheku <kaz@kylheku.com> + Implementing special variables with local overriding. + All predefined globals become special. + + * eval.c (special, with_saved_vars_s): New global variables. + (mark_special, special_p): New functions. + (bindings_helper): Takes new argument, include_specials. + Now processes the special colon syntax for denoting special variables, + setting up their values, taking care to observe whether the + binding is parallel or sequential. + (op_let, op_for): Pass new argument to bindings_helper. + (op_each): Pass new argument to bindings_helper with a value of it, + and deal with the colon annotations that emerge in the bindings. + (op_defvar, regvar): Mark symbol as special. + (op_with_saved_vars): New static function. + (expand_vars): Takes new argument, returns a cons. Detects special + variables among the vars and produces the colon syntax. + (expand_catch_clause): Bugfix: this was using expand_vars on + a parameter list. Now properly uses expand_params. + (expand_save_specials): New static function. + (expand): For the operators that are binding constructs, handle + the new form of expand_vars which returns information about + special variables. If specials occur, then generate the + with-saved-vars form around the expansion which will save and restore + their values. The expansion of vars done by expand_vars, together + with the run-time actions of bindings_helper, do the rest. + Speaking of which, the new with-saved-vars operator form is now + expanded here too. + (eval_init): Protect new variables special and with_saved_vars_s. + Initialize special with new hash table. Store new interned + symbol in with_saved_vars_s. Register op_with_save_vars in op_table. + + * txr.1: Documented specials. + +2014-02-21 Kaz Kylheku <kaz@kylheku.com> + * eval.c (subst_vars): Change throwing of query_error_s to eval_error call. This is a leftover from when this was cloned from its counterpart in match.c. However, I can't think of a way |