X-Git-Url: https://git.donarmstrong.com/?a=blobdiff_plain;f=lily%2Ftranslator.cc;h=116f2849ac702e33bb6e892dd6d8774f36e26c4b;hb=9e781b7dc83b60a543ce218aa1a5f139f74c760f;hp=762fdfd2f9a7664d877e899a312a059c27137e9c;hpb=e09265d8e9ad94714076ca91e63eab5c55679286;p=lilypond.git diff --git a/lily/translator.cc b/lily/translator.cc index 762fdfd2f9..116f2849ac 100644 --- a/lily/translator.cc +++ b/lily/translator.cc @@ -1,17 +1,30 @@ /* - translator.cc -- implement Translator + This file is part of LilyPond, the GNU music typesetter. - source file of the GNU LilyPond music typesetter + Copyright (C) 1997--2014 Han-Wen Nienhuys - (c) 1997--2006 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 "translator.hh" -#include "warn.hh" -#include "translator-group.hh" #include "context-def.hh" +#include "dispatcher.hh" #include "global-context.hh" +#include "international.hh" +#include "translator-group.hh" +#include "warn.hh" #include "translator.icc" #include "ly-smobs.icc" @@ -23,7 +36,6 @@ Translator::~Translator () void Translator::init () { - must_be_last_ = false; self_scm_ = SCM_EOL; daddy_context_ = 0; smobify_self (); @@ -46,14 +58,8 @@ Translator::Translator () Translator::Translator (Translator const &src) { + (void) src; init (); - must_be_last_ = src.must_be_last_; -} - -bool -Translator::try_music (Music *) -{ - return false; } Moment @@ -74,6 +80,12 @@ Translator::get_daddy_translator () const return daddy_context_->implementation (); } +void +Translator::protect_event (SCM ev) +{ + get_daddy_translator ()->protect_event (ev); +} + SCM Translator::internal_get_property (SCM sym) const { @@ -86,12 +98,9 @@ Translator::stop_translation_timestep () } /* - this function has 2 properties - - - It is called before try_music () - - - It is called before any user information enters the translators. - (i.e. any \property or event is not processed yet.) + this function is called once each moment, before any user + information enters the translators. (i.e. no \property or event has + been processed yet.) */ void Translator::start_translation_timestep () @@ -108,6 +117,86 @@ Translator::finalize () { } +void +Translator::connect_to_context (Context *c) +{ + for (translator_listener_record *r = get_listener_list (); r; r = r->next_) + c->events_below ()->add_listener (r->get_listener_ (this, r->event_class_), + r->event_class_); +} + +void +Translator::disconnect_from_context (Context *c) +{ + for (translator_listener_record *r = get_listener_list (); r; r = r->next_) + c->events_below ()->remove_listener (r->get_listener_ (this, r->event_class_), + r->event_class_); +} + +/* + internally called once, statically, for each translator + listener. Connects the name of an event class with a procedure that + fetches the corresponding listener. + + The method should only be called from the macro + IMPLEMENT_TRANSLATOR_LISTENER. + */ +void +Translator::add_translator_listener (translator_listener_record **listener_list, + translator_listener_record *r, + Listener (*get_listener) (void *, SCM), + const char *ev_class) +{ + /* ev_class is the C++ identifier name. Convert to scm symbol */ + string name = string (ev_class); + name = replace_all (&name, '_', '-'); + name += "-event"; + + // we make the symbol permanent in order not to have to bother about + // the static translator_listener_record chains while garbage + // collecting. + + SCM class_sym = scm_permanent_object (scm_from_locale_symbol (name.c_str ())); + + r->event_class_ = class_sym; + r->get_listener_ = get_listener; + r->next_ = *listener_list; + *listener_list = r; +} + +/* + Helps the individual static_translator_description methods of translators. +*/ +SCM +Translator::static_translator_description (const char *grobs, + const char *desc, + translator_listener_record *listener_list, + const char *read, + const char *write) const +{ + SCM static_properties = SCM_EOL; + + static_properties = scm_acons (ly_symbol2scm ("grobs-created"), + parse_symbol_list (grobs), static_properties); + + static_properties = scm_acons (ly_symbol2scm ("description"), + scm_from_locale_string (desc), static_properties); + + SCM list = SCM_EOL; + for (; listener_list; listener_list = listener_list->next_) + list = scm_cons (listener_list->event_class_, list); + static_properties = scm_acons (ly_symbol2scm ("events-accepted"), + list, static_properties); + + static_properties = scm_acons (ly_symbol2scm ("properties-read"), + parse_symbol_list (read), static_properties); + + static_properties = scm_acons (ly_symbol2scm ("properties-written"), + parse_symbol_list (write), static_properties); + + return static_properties; +} + /* SMOBS */ @@ -138,7 +227,7 @@ IMPLEMENT_TYPE_P (Translator, "ly:translator?"); bool Translator::must_be_last () const { - return must_be_last_; + return false; } void @@ -158,17 +247,20 @@ Translator::print_smob (SCM s, SCM port, scm_print_state *) void add_acknowledger (Engraver_void_function_engraver_grob_info ptr, - char const *func_name, - vector *ack_array) + char const *func_name, + vector *ack_array) { Acknowledge_information inf; inf.function_ = ptr; string interface_name (func_name); - interface_name = replace_all (interface_name, '_', '-'); + interface_name = replace_all (&interface_name, '_', '-'); interface_name += "-interface"; + /* + this is only called during program init, so safe to use scm_gc_protect_object () + */ inf.symbol_ = scm_gc_protect_object (ly_symbol2scm (interface_name.c_str ())); ack_array->push_back (inf); } @@ -179,14 +271,79 @@ generic_get_acknowledger (SCM sym, vector const *ack_ar for (vsize i = 0; i < ack_array->size (); i++) { if (ack_array->at (i).symbol_ == sym) - return ack_array->at (i).function_; + return ack_array->at (i).function_; } return 0; } +Moment +get_event_length (Stream_event *e) +{ + Moment *m = unsmob_moment (e->get_property ("length")); + if (m) + return *m; + else + return Moment (0); +} + +Moment +get_event_length (Stream_event *e, Moment now) +{ + Moment len = get_event_length (e); + + if (now.grace_part_) + { + len.grace_part_ = len.main_part_; + len.main_part_ = Rational (0); + } + return len; +} + +/* + Helper, used through ASSIGN_EVENT_ONCE to throw warnings for + simultaneous events. The helper is only useful in listen_* methods + of translators. +*/ +bool +internal_event_assignment (Stream_event **old_ev, Stream_event *new_ev, const char *function) +{ + if (*old_ev + && !to_boolean (scm_equal_p ((*old_ev)->self_scm (), + new_ev->self_scm ()))) + { + /* extract event class from function name */ + string ev_class = function; + + /* This assertion fails if EVENT_ASSIGNMENT was called outside a + translator listener. Don't do that. */ + const char *prefix = "listen_"; + assert (0 == ev_class.find (prefix)); + + /* "listen_foo_bar" -> "foo-bar" */ + ev_class.erase (0, strlen (prefix)); + replace_all (&ev_class, '_', '-'); + + new_ev->origin ()->warning (_f ("Two simultaneous %s events, junking this one", ev_class.c_str ())); + (*old_ev)->origin ()->warning (_f ("Previous %s event here", ev_class.c_str ())); + return false; + } + else + { + *old_ev = new_ev; + return true; + } +} + ADD_TRANSLATOR (Translator, - "Base class. Unused", - "", - "", - "", - ""); + /* doc */ + "Base class. Not instantiated.", + + /* create */ + "", + + /* read */ + "", + + /* write */ + "" + );