X-Git-Url: https://git.donarmstrong.com/?a=blobdiff_plain;f=lily%2Fcontext-property.cc;h=4d1de2403460d631be0eeb4ef752ede71f3c2feb;hb=941dff9d2a67080e0dd8474f1e70f0c72ace6424;hp=880086209a61b0e911d1375d3b607a0358d485e6;hpb=b4d2043223a86826764bc531e684a864c97605fe;p=lilypond.git diff --git a/lily/context-property.cc b/lily/context-property.cc index 880086209a..4d1de24034 100644 --- a/lily/context-property.cc +++ b/lily/context-property.cc @@ -1,115 +1,217 @@ /* - context-property.cc -- implement manipulation of immutable Grob - property lists. + This file is part of LilyPond, the GNU music typesetter. - source file of the GNU LilyPond music typesetter + Copyright (C) 2004--2011 Han-Wen Nienhuys - (c) 2004--2005 Han-Wen Nienhuys + LilyPond is free software: you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation, either version 3 of the License, or + (at your option) any later version. + + LilyPond is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with LilyPond. If not, see . */ #include "context.hh" #include "engraver.hh" +#include "international.hh" #include "item.hh" #include "main.hh" +#include "simple-closure.hh" #include "spanner.hh" #include "warn.hh" -#include "paper-column.hh" + +/* + like execute_general_pushpop_property(), but typecheck + grob_property_path and context_property. +*/ +void +general_pushpop_property (Context *context, + SCM context_property, + SCM grob_property_path, + SCM new_value) +{ + if (!scm_is_symbol (context_property) + || !scm_is_symbol (scm_car (grob_property_path))) + { + warning (_ ("need symbol arguments for \\override and \\revert")); + if (do_internal_type_checking_global) + assert (false); + } + + sloppy_general_pushpop_property (context, context_property, + grob_property_path, new_value); +} + /* Grob descriptions (ie. alists with layout properties) are represented as a (ALIST . BASED-ON) pair, where BASED-ON is the alist defined in a parent context. BASED-ON should always be a tail of ALIST. + + Push or pop (depending on value of VAL) a single entry from a + translator property list by name of PROP. GROB_PROPERTY_PATH + indicates nested alists, eg. '(beamed-stem-lengths details) + */ +void +execute_override_property (Context *context, + SCM context_property, + SCM grob_property_path, + SCM new_value) +{ + SCM current_context_val = SCM_EOL; + + Context *where = context->where_defined (context_property, + ¤t_context_val); + + /* + Don't mess with MIDI. + */ + if (!where) + return; + + if (where != context) + { + SCM base = updated_grob_properties (context, context_property); + current_context_val = scm_cons (base, base); + context->set_property (context_property, current_context_val); + } + + if (!scm_is_pair (current_context_val)) + { + programming_error ("Grob definition should be cons"); + return; + } + + SCM target_alist = scm_car (current_context_val); + + /* + If the car is a list, the property path comes from a nested override + using list syntax inside a \context block + */ + if (scm_is_pair (scm_car (grob_property_path))) + grob_property_path = scm_car (grob_property_path); + + SCM symbol = scm_car (grob_property_path); + if (scm_is_pair (scm_cdr (grob_property_path))) + { + new_value = nested_property_alist (ly_assoc_get (symbol, target_alist, + SCM_EOL), + scm_cdr (grob_property_path), + new_value); + } + + /* it's tempting to replace the head of the list if it's the same + property. However, we have to keep this info around, in case we have to + \revert back to it. + */ + target_alist = scm_acons (symbol, new_value, target_alist); + + bool ok = true; + if (!ly_is_procedure (new_value) + && !is_simple_closure (new_value)) + ok = type_check_assignment (symbol, new_value, + ly_symbol2scm ("backend-type?")); + + /* + tack onto alist. We can use set_car, since + updated_grob_properties () in child contexts will check + for changes in the car. + */ + if (ok) + { + scm_set_car_x (current_context_val, target_alist); + } +} /* - Push or pop (depending on value of VAL) a single entry (ELTPROP . VAL) - entry from a translator property list by name of PROP -*/ + do a pop (indicated by new_value==SCM_UNDEFINED) or push + */ +void +sloppy_general_pushpop_property (Context *context, + SCM context_property, + SCM grob_property_path, + SCM new_value) +{ + if (new_value == SCM_UNDEFINED) + execute_revert_property (context, context_property, + grob_property_path); + else + execute_override_property (context, context_property, + grob_property_path, + new_value); +} +/* + Revert the property given by property_path. +*/ void -execute_pushpop_property (Context *trg, - SCM prop, SCM eltprop, SCM val) +execute_revert_property (Context *context, + SCM context_property, + SCM grob_property_path) { - SCM prev = SCM_EOL; - if (scm_is_symbol (prop) && scm_is_symbol (eltprop)) + SCM current_context_val = SCM_EOL; + if (context->where_defined (context_property, ¤t_context_val) + == context) { - if (val != SCM_UNDEFINED) + SCM current_alist = scm_car (current_context_val); + SCM daddy = scm_cdr (current_context_val); + + if (!scm_is_pair (grob_property_path) + || !scm_is_symbol (scm_car (grob_property_path))) { - Context *where = trg->where_defined (prop, &prev); - - /* - Don't mess with MIDI. - */ - if (!where) - return; - - if (where != trg) - { - SCM base = updated_grob_properties (trg, prop); - prev = scm_cons (base, base); - trg->internal_set_property (prop, prev); - } - - if (!scm_is_pair (prev)) - { - programming_error ("Grob definition should be cons"); - return; - } - - SCM prev_alist = scm_car (prev); - - if (scm_is_pair (prev_alist) || prev_alist == SCM_EOL) - { - bool ok = type_check_assignment (eltprop, val, ly_symbol2scm ("backend-type?")); - - /* - tack onto alist: - */ - if (ok) - scm_set_car_x (prev, scm_acons (eltprop, val, prev_alist)); - } - else - { - // warning here. - } + programming_error ("Grob property path should be list of symbols."); + return; } - else if (trg->where_defined (prop, &prev) == trg) + + SCM symbol = scm_car (grob_property_path); + if (scm_is_pair (scm_cdr (grob_property_path))) { - SCM prev_alist = scm_car (prev); - SCM daddy = scm_cdr (prev); - - SCM new_alist = SCM_EOL; - SCM *tail = &new_alist; - - while (prev_alist != daddy) - { - if (ly_is_equal (scm_caar (prev_alist), eltprop)) - { - prev_alist = scm_cdr (prev_alist); - break; - } - - *tail = scm_cons (scm_car (prev_alist), SCM_EOL); - tail = SCM_CDRLOC (*tail); - prev_alist = scm_cdr (prev_alist); - } - - if (new_alist == SCM_EOL && prev_alist == daddy) - trg->unset_property (prop); + SCM current_sub_alist = ly_assoc_get (symbol, current_alist, SCM_EOL); + SCM new_val + = nested_property_revert_alist (current_sub_alist, + scm_cdr (grob_property_path)); + + if (scm_is_pair (current_alist) + && scm_caar (current_alist) == symbol + && current_alist != daddy) + current_alist = scm_cdr (current_alist); + + current_alist = scm_acons (symbol, new_val, current_alist); + scm_set_car_x (current_context_val, current_alist); + } + else + { + SCM new_alist = evict_from_alist (symbol, current_alist, daddy); + + if (new_alist == daddy) + context->unset_property (context_property); else - { - *tail = prev_alist; - trg->internal_set_property (prop, scm_cons (new_alist, daddy)); - } + context->set_property (context_property, + scm_cons (new_alist, daddy)); } } - else - { - warning (_ ("need symbol arguments for \\override and \\revert")); - if (do_internal_type_checking_global) - assert (false); - } +} +/* + Convenience: a push/pop grob property using a single grob_property + as argument. +*/ +void +execute_pushpop_property (Context *context, + SCM context_property, + SCM grob_property, + SCM new_value) +{ + general_pushpop_property (context, context_property, + scm_list_1 (grob_property), + new_value); } /* @@ -125,17 +227,22 @@ apply_property_operations (Context *tg, SCM pre_init_ops) SCM type = scm_car (entry); entry = scm_cdr (entry); - if (type == ly_symbol2scm ("push") || type == ly_symbol2scm ("poppush")) + if (type == ly_symbol2scm ("push")) { - SCM val = scm_cddr (entry); - val = scm_is_pair (val) ? scm_car (val) : SCM_UNDEFINED; - - execute_pushpop_property (tg, scm_car (entry), scm_cadr (entry), val); + SCM context_prop = scm_car (entry); + SCM val = scm_cadr (entry); + SCM grob_prop_path = scm_cddr (entry); + sloppy_general_pushpop_property (tg, context_prop, grob_prop_path, val); } - else if (type == ly_symbol2scm ("assign")) + else if (type == ly_symbol2scm ("pop")) { - tg->internal_set_property (scm_car (entry), scm_cadr (entry)); + SCM context_prop = scm_car (entry); + SCM val = SCM_UNDEFINED; + SCM grob_prop_path = scm_cdr (entry); + sloppy_general_pushpop_property (tg, context_prop, grob_prop_path, val); } + else if (type == ly_symbol2scm ("assign")) + tg->set_property (scm_car (entry), scm_cadr (entry)); } } @@ -166,9 +273,7 @@ updated_grob_properties (Context *tg, SCM sym) SCM based_on = scm_cdr (props); if (based_on == daddy_props) - { - return scm_car (props); - } + return scm_car (props); else { SCM copy = daddy_props; @@ -187,52 +292,3 @@ updated_grob_properties (Context *tg, SCM sym) return copy; } } - -Grob * -make_grob_from_properties (Engraver *tr, SCM symbol, SCM cause, char const *name) -{ - Context *context = tr->context (); - - SCM props = updated_grob_properties (context, symbol); - - Object_key const *key = context->get_grob_key (name); - Grob *grob = 0; - - SCM handle = scm_sloppy_assq (ly_symbol2scm ("meta"), props); - SCM klass = scm_cdr (scm_sloppy_assq (ly_symbol2scm ("class"), scm_cdr (handle))); - - if (klass == ly_symbol2scm ("Item")) - grob = new Item (props, key); - else if (klass == ly_symbol2scm ("Spanner")) - grob = new Spanner (props, key); - else if (klass == ly_symbol2scm ("Paper_column")) - grob = new Paper_column (props, key); - - assert (grob); - dynamic_cast (tr)->announce_grob (grob, cause); - - return grob; -} - -Item * -make_item_from_properties (Engraver *tr, SCM x, SCM cause, char const *name) -{ - Item *it = dynamic_cast (make_grob_from_properties (tr, x, cause, name)); - assert (it); - return it; -} - -Paper_column * -make_paper_column_from_properties (Engraver *tr, SCM x, char const *name) -{ - return dynamic_cast (make_grob_from_properties (tr, x, SCM_EOL, name)); -} - - -Spanner * -make_spanner_from_properties (Engraver *tr, SCM x, SCM cause, char const *name) -{ - Spanner *sp = dynamic_cast (make_grob_from_properties (tr, x, cause, name)); - assert (sp); - return sp; -}