X-Git-Url: https://git.donarmstrong.com/?a=blobdiff_plain;f=lily%2Fauto-beam-engraver.cc;h=2c61f00959b3283568bf6550508949f688555f60;hb=97a0169312a260933246ab224e4f8b0969871dd5;hp=09a6d2a8312694949c1fb21949ea651add6b18e6;hpb=bdf4ab13203502e7ec7cf9cf5896527643a07c1f;p=lilypond.git diff --git a/lily/auto-beam-engraver.cc b/lily/auto-beam-engraver.cc index 09a6d2a831..2c61f00959 100644 --- a/lily/auto-beam-engraver.cc +++ b/lily/auto-beam-engraver.cc @@ -1,55 +1,79 @@ /* - auto-beam-engraver.cc -- implement Auto_beam_engraver + This file is part of LilyPond, the GNU music typesetter. - source file of the GNU LilyPond music typesetter + Copyright (C) 1999--2015 Jan Nieuwenhuizen - (c) 1999--2005 Jan Nieuwenhuizen + 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 "engraver.hh" -#include "beaming.hh" +#include "beaming-pattern.hh" #include "beam.hh" -#include "stem.hh" -#include "warn.hh" -#include "bar-line.hh" -#include "rest.hh" +#include "context.hh" +#include "context-handle.hh" +#include "duration.hh" +#include "engraver.hh" +#include "grob-properties.hh" #include "item.hh" +#include "rest.hh" #include "spanner.hh" -#include "context.hh" +#include "stream-event.hh" +#include "stem.hh" +#include "warn.hh" + +#include "translator.icc" class Auto_beam_engraver : public Engraver { TRANSLATOR_DECLARATIONS (Auto_beam_engraver); protected: - virtual void stop_translation_timestep (); - virtual void start_translation_timestep (); + void stop_translation_timestep (); + void process_acknowledged (); + virtual void process_music (); - virtual bool try_music (Music *); virtual void finalize (); - virtual void acknowledge_grob (Grob_info); - virtual void process_acknowledged_grobs (); + virtual void derived_mark () const; + + void acknowledge_rest (Grob_info); + void acknowledge_beam (Grob_info); + void acknowledge_bar_line (Grob_info); + void acknowledge_breathing_sign (Grob_info); + void acknowledge_stem (Grob_info); + void listen_beam_forbid (Stream_event *); private: - bool test_moment (Direction, Moment); - void consider_begin (Moment); - void consider_end (Moment); + virtual bool test_moment (Direction, Moment, Moment); + void consider_begin (Moment, Moment); + void consider_end (Moment, Moment); Spanner *create_beam (); void begin_beam (); void end_beam (); void junk_beam (); - bool is_same_grace_state (Grob *e); + virtual bool is_same_grace_state (Moment, Moment); + void recheck_beam (); void typeset_beam (); + vector *remove_end_stems (vsize); - Music *forbid_; + Stream_event *forbid_; /* - shortest_mom is the shortest note in the beam. + shortest_mom_ is the shortest note in the beam. */ Moment shortest_mom_; Spanner *finished_beam_; - Link_array *stems_; + vector *stems_; - int count_; + int process_acknowledged_count_; Moment last_add_mom_; /* Projected ending of the beam we're working on. @@ -57,215 +81,125 @@ private: Moment extend_mom_; Moment beam_start_moment_; Moment beam_start_location_; - - bool subdivide_beams_; - Moment beat_length_; + /* + Handle on the starting staff keeps it alive until beam is comlete + */ + Context_handle beam_start_context_; // We act as if beam were created, and start a grouping anyway. - Beaming_info_list *grouping_; - SCM beam_settings_; // ugh. should protect ? + Beaming_pattern *grouping_; + SCM beam_settings_; + + Beaming_pattern *finished_grouping_; - Beaming_info_list *finished_grouping_; + Beaming_options beaming_options_; + Beaming_options finished_beaming_options_; + + void check_bar_property (); }; +void +Auto_beam_engraver::derived_mark () const +{ + scm_gc_mark (beam_settings_); +} + +void +Auto_beam_engraver::check_bar_property () +{ + /* Duplicated from process_music (), since + Repeat_acknowledge_engraver::process_music () may also set whichBar. */ + + Moment now = now_mom (); + if (scm_is_string (get_property ("whichBar")) + && beam_start_moment_ < now) + { + consider_end (measure_position (context ()), shortest_mom_); + junk_beam (); + } +} + void Auto_beam_engraver::process_music () { + Moment now = now_mom (); + /* + don't beam over skips + */ + if (stems_) + { + if (extend_mom_ < now) + end_beam (); + } + if (scm_is_string (get_property ("whichBar"))) { - consider_end (shortest_mom_); + consider_end (measure_position (context ()), shortest_mom_); junk_beam (); } if (forbid_) { - consider_end (shortest_mom_); - junk_beam (); + if (stems_) + end_beam (); + else + junk_beam (); } } -Auto_beam_engraver::Auto_beam_engraver () +Auto_beam_engraver::Auto_beam_engraver (Context *c) + : Engraver (c) { forbid_ = 0; - count_ = 0; + process_acknowledged_count_ = 0; stems_ = 0; - shortest_mom_ = Moment (Rational (1, 8)); + shortest_mom_ = Moment (Rational (1, 4)); + extend_mom_ = Moment (-1); finished_beam_ = 0; finished_grouping_ = 0; grouping_ = 0; beam_settings_ = SCM_EOL; } -bool -Auto_beam_engraver::try_music (Music *m) +void +Auto_beam_engraver::listen_beam_forbid (Stream_event *ev) { - if (m->is_mus_type ("beam-forbid-event")) - { - forbid_ = m; - return true; - } - - return false; + ASSIGN_EVENT_ONCE (forbid_, ev); } -/* - Determine end moment for auto beaming (or begin moment, but mostly - 0== anywhere) In order of increasing priority: - - i. begin anywhere, end at every beat - ii. end * - iii. end - - iv. end * * * - v. end * * - - - Rationale: - - [to be defined in config file] - i. easy catch-all rule - ii. exceptions for time signature - iii. exceptions for time signature, for specific duration type - - [user override] - iv. generic override - v. override for specific duration type -*/ bool -Auto_beam_engraver::test_moment (Direction dir, Moment test_mom) +Auto_beam_engraver::test_moment (Direction dir, Moment test_mom, Moment dur) { - Moment now = now_mom (); - if (dir == START - && now.grace_part_) - { - return false; - } - - SCM wild = scm_list_n (ly_symbol2scm ("*"), ly_symbol2scm ("*"), SCM_UNDEFINED); - SCM function; - if (dir == START) - function = scm_list_n (ly_symbol2scm ("begin"), SCM_UNDEFINED); - else - function = scm_list_n (ly_symbol2scm ("end"), SCM_UNDEFINED); - - Moment beat_length (1, 4); - if (Moment *m = unsmob_moment (get_property ("beatLength"))) - { - beat_length = *m; - } - Moment measure_length (1, 1); - int num = 4; - if (Moment *m = unsmob_moment (get_property ("measureLength"))) - { - num = int ((*m / beat_length).main_part_); - } - - int den = beat_length.den (); - SCM time = scm_list_n (scm_int2num (num), scm_int2num (den), SCM_UNDEFINED); - - SCM type = scm_list_n (scm_int2num (test_mom.num ()), - scm_int2num (test_mom.den ()), SCM_UNDEFINED); - - /* - UGH UGH. - settings aren't grob-properties. - */ - SCM settings = get_property ("autoBeamSettings"); - - /* first guess */ - - /* begin beam at any position - (and fallback for end) */ - Moment moment (0); - - /* end beam at end of beat */ - if (dir == STOP) - { - moment = robust_scm2moment (get_property ("beatLength"), moment); - } - - /* second guess: property generic time exception */ - SCM m = scm_assoc (ly_append3 (function, wild, time), settings); - - if (m != SCM_BOOL_F && unsmob_moment (scm_cdr (m))) - moment = *unsmob_moment (scm_cdr (m)); - - /* third guess: property time exception, specific for duration type */ - m = scm_assoc (ly_append3 (function, type, time), settings); - if (m != SCM_BOOL_F && unsmob_moment (scm_cdr (m))) - moment = *unsmob_moment (scm_cdr (m)); - - /* fourth guess [user override]: property plain generic */ - m = scm_assoc (ly_append3 (function, wild, wild), settings); - if (m != SCM_BOOL_F && unsmob_moment (scm_cdr (m))) - moment = *unsmob_moment (scm_cdr (m)); - - /* fifth guess [user override]: property plain, specific for duration type */ - m = scm_assoc (ly_append3 (function, type, wild), settings); - if (m != SCM_BOOL_F && unsmob_moment (scm_cdr (m))) - moment = *unsmob_moment (scm_cdr (m)); - - Rational r; - if (moment.to_bool ()) - { - /* Ugh? measurePosition can be negative, when \partial - We may have to fix this elsewhere (timing translator) - r = unsmob_moment (get_property ("measurePosition"))->mod_rat (moment); - */ - Moment pos (0); - if (Moment *m = unsmob_moment (get_property ("measurePosition"))) - { - pos = *m; - } - - if (pos < Moment (0)) - { - Moment length (1); - - if (Moment *m = unsmob_moment (get_property ("measureLength"))) - { - length = *m; - } - pos = length - pos; - } - r = pos.main_part_.mod_rat (moment.main_part_); - } - else - { - if (dir == START) - /* if undefined, starting is ok */ - r = 0; - else - /* but ending is not */ - r = 1; - } - - return !r; + return scm_is_true (scm_call_4 (get_property ("autoBeamCheck"), + context ()->self_scm (), + scm_from_int (dir), + test_mom.smobbed_copy (), + dur.smobbed_copy ())); } void -Auto_beam_engraver::consider_begin (Moment test_mom) +Auto_beam_engraver::consider_begin (Moment test_mom, Moment dur) { bool on = to_boolean (get_property ("autoBeaming")); if (!stems_ && on && !forbid_) { - bool b = test_moment (START, test_mom); + bool b = test_moment (START, test_mom, dur); if (b) - begin_beam (); + begin_beam (); } } void -Auto_beam_engraver::consider_end (Moment test_mom) +Auto_beam_engraver::consider_end (Moment test_mom, Moment dur) { if (stems_) { /* Allow already started autobeam to end: - don't check for autoBeaming */ - bool b = test_moment (STOP, test_mom); + don't check for autoBeaming */ + bool b = test_moment (STOP, test_mom, dur); if (b) - end_beam (); + end_beam (); } } @@ -275,21 +209,21 @@ Auto_beam_engraver::create_beam () if (to_boolean (get_property ("skipTypesetting"))) return 0; - Spanner *beam = new Spanner (beam_settings_, context ()->get_grob_key ("Beam")); - for (int i = 0; i < stems_->size (); i++) - { - /* - watch out for stem tremolos and abbreviation beams - */ - if (Stem::get_beam ((*stems_)[i])) - { - scm_gc_unprotect_object (beam->self_scm ()); - return 0; - } - Beam::add_stem (beam, (*stems_)[i]); - } + for (vsize i = 0; i < stems_->size (); i++) + if (Stem::get_beam ((*stems_)[i])) + return 0; - announce_grob (beam, (*stems_)[0]->self_scm ()); + /* + Can't use make_spanner () because we have to use + beam_settings_. + */ + Spanner *beam = new Spanner (beam_settings_); + + for (vsize i = 0; i < stems_->size (); i++) + Beam::add_stem (beam, (*stems_)[i]); + + Grob_info i = make_grob_info (beam, (*stems_)[0]->self_scm ()); + announce_grob (i, beam_start_context_.get_context ()); return beam; } @@ -303,15 +237,15 @@ Auto_beam_engraver::begin_beam () return; } - stems_ = new Link_array; - grouping_ = new Beaming_info_list; - beam_settings_ = updated_grob_properties (context (), ly_symbol2scm ("Beam")); + stems_ = new vector; + grouping_ = new Beaming_pattern (); + beaming_options_.from_context (context ()); + beam_settings_ = Grob_property_info (context (), ly_symbol2scm ("Beam")).updated (); + beam_start_context_.set_context (context ()->get_parent_context ()); beam_start_moment_ = now_mom (); beam_start_location_ = robust_scm2moment (get_property ("measurePosition"), Moment (0)); - subdivide_beams_ = ly_scm2bool (get_property ("subdivideBeams")); - beat_length_ = robust_scm2moment (get_property ("beatLength"), Moment (1, 4)); } void @@ -326,28 +260,41 @@ Auto_beam_engraver::junk_beam () grouping_ = 0; beam_settings_ = SCM_EOL; - shortest_mom_ = Moment (Rational (1, 8)); + shortest_mom_ = Moment (Rational (1, 4)); } +bool +Auto_beam_engraver::is_same_grace_state (Moment start, Moment now) +{ + return bool (start.grace_part_) == bool (now.grace_part_); +} + + void Auto_beam_engraver::end_beam () { if (stems_->size () < 2) - { - junk_beam (); - } + junk_beam (); else { finished_beam_ = create_beam (); + if (finished_beam_) - finished_grouping_ = grouping_; + { + Grob_info i = make_grob_info (finished_beam_, SCM_EOL); + + announce_end_grob (i, beam_start_context_.get_context ()); + finished_grouping_ = grouping_; + finished_beaming_options_ = beaming_options_; + } delete stems_; stems_ = 0; grouping_ = 0; beam_settings_ = SCM_EOL; } - shortest_mom_ = Moment (Rational (1, 8)); + beam_start_context_.set_context (NULL); + shortest_mom_ = Moment (Rational (1, 4)); } void @@ -355,7 +302,10 @@ Auto_beam_engraver::typeset_beam () { if (finished_beam_) { - finished_grouping_->beamify (beat_length_, subdivide_beams_); + if (!finished_beam_->get_bound (RIGHT)) + finished_beam_->set_bound (RIGHT, finished_beam_->get_bound (LEFT)); + + finished_grouping_->beamify (finished_beaming_options_); Beam::set_beaming (finished_beam_, finished_grouping_); finished_beam_ = 0; @@ -364,28 +314,12 @@ Auto_beam_engraver::typeset_beam () } } -void -Auto_beam_engraver::start_translation_timestep () -{ - count_ = 0; - /* - don't beam over skips - */ - if (stems_) - { - Moment now = now_mom (); - if (extend_mom_ < now) - { - end_beam (); - } - } - forbid_ = 0; -} - void Auto_beam_engraver::stop_translation_timestep () { typeset_beam (); + process_acknowledged_count_ = 0; + forbid_ = 0; } void @@ -399,153 +333,334 @@ Auto_beam_engraver::finalize () } void -Auto_beam_engraver::acknowledge_grob (Grob_info info) +Auto_beam_engraver::acknowledge_beam (Grob_info /* info */) +{ + check_bar_property (); + if (stems_) + end_beam (); +} + +void +Auto_beam_engraver::acknowledge_bar_line (Grob_info /* info */) +{ + check_bar_property (); + if (stems_) + end_beam (); +} + +void +Auto_beam_engraver::acknowledge_breathing_sign (Grob_info /* info */) +{ + check_bar_property (); + if (stems_) + end_beam (); +} + +void +Auto_beam_engraver::acknowledge_rest (Grob_info /* info */) { + check_bar_property (); + if (stems_) + end_beam (); +} + +void +Auto_beam_engraver::acknowledge_stem (Grob_info info) +{ + check_bar_property (); + Item *stem = dynamic_cast (info.grob ()); + Stream_event *ev = info.ultimate_event_cause (); + if (!ev->in_event_class ("rhythmic-event")) + { + programming_error ("stem must have rhythmic structure"); + return; + } + /* - Duplicated from process_music(), since - Repeat_acknowledge_engraver::process_music() may also set whichBar + Don't (start) auto-beam over empty stems; skips or rests */ - if (scm_is_string (get_property ("whichBar")) - && beam_start_moment_ < now_mom ()) + if (!Stem::head_count (stem)) { - consider_end (shortest_mom_); - junk_beam (); + if (stems_) + end_beam (); + return; } - if (stems_) + if (Stem::get_beam (stem)) { - if (Beam::has_interface (info.grob_)) - { - end_beam (); - } - else if (Bar_line::has_interface (info.grob_)) - { - end_beam (); - } - else if (Rest::has_interface (info.grob_)) - { - end_beam (); - } + if (stems_) + junk_beam (); + return; } - if (Stem::has_interface (info.grob_)) + int durlog = unsmob (ev->get_property ("duration"))->duration_log (); + + if (durlog <= 2) + { + if (stems_) + end_beam (); + return; + } + + /* + ignore interspersed grace notes. + */ + Moment now = now_mom (); + if (!is_same_grace_state (beam_start_location_, now)) + return; + + Duration *stem_duration = unsmob (ev->get_property ("duration")); + Moment dur = stem_duration->get_length (); + + //Moment dur = unsmob (ev->get_property ("duration"))->get_length (); + Moment measure_now = measure_position (context ()); + bool recheck_needed = false; + + if (dur < shortest_mom_) + { + /* new shortest moment, so store it and set recheck_needed */ + shortest_mom_ = dur; + recheck_needed = true; + } + + /* end should be based on shortest_mom_, begin should be + based on current duration */ + consider_end (measure_now, shortest_mom_); + consider_begin (measure_now, dur); + + if (!stems_) + return; + + grouping_->add_stem (now - beam_start_moment_ + beam_start_location_, + durlog - 2, + Stem::is_invisible (stem), + stem_duration->factor (), + (to_boolean (stem->get_property ("tuplet-start")))); + stems_->push_back (stem); + last_add_mom_ = now; + extend_mom_ = max (extend_mom_, now) + get_event_length (ev, now); + if (recheck_needed) + recheck_beam (); +} + +void +Auto_beam_engraver::recheck_beam () +{ + /* + Recheck the beam after the shortest duration has changed + If shorter duration has created a new break, typeset the + first part of the beam and reset the current beam to just + the last part of the beam + */ + Beaming_pattern *new_grouping_ = 0; + vector *new_stems_ = 0; + Moment temporary_shortest_mom; + SCM temporary_beam_settings; + + bool found_end; + + for (vsize i = 0; i < stems_->size () - 1;) { - Item *stem = dynamic_cast (info.grob_); - Music *m = info.music_cause (); - if (!m->is_mus_type ("rhythmic-event")) - { - programming_error ("Stem must have rhythmic structure"); - return; - } - - /* - Don't (start) auto-beam over empty stems; skips or rests - */ - if (!Stem::head_count (stem)) - { - if (stems_) - end_beam (); - return; - } - - if (Stem::get_beam (stem)) - { - if (stems_) - junk_beam (); - return; - } - - int durlog = unsmob_duration (m->get_property ("duration"))->duration_log (); - - if (durlog <= 2) - { - if (stems_) - end_beam (); - return; - } - - /* - ignore grace notes. - */ - if (bool (beam_start_location_.grace_part_) != bool (now_mom ().grace_part_)) - return; - - Moment dur = unsmob_duration (m->get_property ("duration"))->get_length (); - /* FIXME: - - This comment has been here since long: - - if shortest duration would change - consider ending and beginning beam first. - - but the code didn't match: */ -#if 1 - consider_end (dur); - consider_begin (dur); - - if (dur < shortest_mom_) - shortest_mom_ = dur; -#else - /* I very much suspect that we wanted: */ - - consider_end (shortest_mom_); - if (dur < shortest_mom_) - { - shortest_mom_ = dur; - consider_end (shortest_mom_); - } - consider_begin (shortest_mom_); -#endif - - if (!stems_) - return; - - Moment now = now_mom (); - - grouping_->add_stem (now - beam_start_moment_ + beam_start_location_, - durlog - 2); - stems_->push (stem); - last_add_mom_ = now; - extend_mom_ = (extend_mom_ >? now) + m->get_length (); + found_end = test_moment (STOP, + grouping_->end_moment (i), + shortest_mom_); + if (!found_end) + i++; + else + { + /* + Save the current beam settings and shortest_mom_ + Necessary because end_beam destroys them + */ + temporary_shortest_mom = shortest_mom_; + temporary_beam_settings = beam_settings_; + + /* Eliminate (and save) the items no longer part of the first beam */ + + new_grouping_ = grouping_->split_pattern (i); + new_stems_ = remove_end_stems (i); + + end_beam (); + typeset_beam (); + + /* now recreate the unbeamed data structures */ + stems_ = new_stems_; + grouping_ = new_grouping_; + shortest_mom_ = temporary_shortest_mom; + beam_settings_ = temporary_beam_settings; + + i = 0; + } + } + +} + +/* + Remove all stems with an index greater than split_index + from stems_, and return a vector containing all of the + removed stems +*/ +vector * +Auto_beam_engraver::remove_end_stems (vsize split_index) +{ + vector *removed_stems = 0; + removed_stems = new vector ; + + for (vsize j = split_index + 1; j < stems_->size (); j++) + removed_stems->push_back ((*stems_).at (j)); + for (vsize j = split_index + 1; j < stems_->size ();) + stems_->pop_back (); + return removed_stems; } void -Auto_beam_engraver::process_acknowledged_grobs () +Auto_beam_engraver::process_acknowledged () { - if (!count_) + Moment now = now_mom (); + if (extend_mom_ > now) + return; + + if (!process_acknowledged_count_) { - consider_end (shortest_mom_); - consider_begin (shortest_mom_); + Moment measure_now = measure_position (context ()); + consider_end (measure_now, shortest_mom_); } - else if (count_ > 1) + else if (process_acknowledged_count_ > 1) { if (stems_) - { - Moment now = now_mom (); - if ((extend_mom_ < now) - || ((extend_mom_ == now) && (last_add_mom_ != now))) - { - end_beam (); - } - else if (!stems_->size ()) - { - junk_beam (); - } - } + { + if ((extend_mom_ < now) + || ((extend_mom_ == now) && (last_add_mom_ != now))) + end_beam (); + else if (!stems_->size ()) + junk_beam (); + } } - count_++; + process_acknowledged_count_++; +} + +void +Auto_beam_engraver::boot () +{ + ADD_LISTENER (Auto_beam_engraver, beam_forbid); + ADD_ACKNOWLEDGER (Auto_beam_engraver, stem); + ADD_ACKNOWLEDGER (Auto_beam_engraver, bar_line); + ADD_ACKNOWLEDGER (Auto_beam_engraver, beam); + ADD_ACKNOWLEDGER (Auto_beam_engraver, breathing_sign); + ADD_ACKNOWLEDGER (Auto_beam_engraver, rest); } ADD_TRANSLATOR (Auto_beam_engraver, - /* descr */ "Generate beams based on measure characteristics and observed " - "Stems. Uses beatLength, measureLength and measurePosition to decide " - "when to start and stop a beam. Overriding beaming is done through " - "@ref{Stem_engraver} properties @code{stemLeftBeamCount} and " - "@code{stemRightBeamCount}. ", - /* creats*/ "Beam", - /* accepts */ "beam-forbid-event", - /* acks */ "stem-interface rest-interface beam-interface bar-line-interface", - /* reads */ "autoBeaming autoBeamSettings beatLength subdivideBeams", - /* write */ ""); + /* doc */ + "Generate beams based on measure characteristics and observed" + " Stems. Uses @code{baseMoment}, @code{beatStructure}," + " @code{beamExceptions}, @code{measureLength}, and" + " @code{measurePosition} to decide when to start and stop a" + " beam. Overriding beaming is done through" + " @ref{Stem_engraver} properties @code{stemLeftBeamCount} and" + " @code{stemRightBeamCount}.", + + /* create */ + "Beam ", + + /* read */ + "autoBeaming " + "baseMoment " + "beamExceptions " + "beamHalfMeasure " + "beatStructure " + "subdivideBeams ", + + /* write */ + "" + ); + +class Grace_auto_beam_engraver : public Auto_beam_engraver +{ + TRANSLATOR_DECLARATIONS (Grace_auto_beam_engraver); + TRANSLATOR_INHERIT (Auto_beam_engraver); + +private: + Moment last_grace_start_; // Full starting time of last grace group + Moment last_grace_position_; // Measure position of same + virtual void process_music (); + virtual bool is_same_grace_state (Moment, Moment); + virtual bool test_moment (Direction, Moment, Moment); +}; + +Grace_auto_beam_engraver::Grace_auto_beam_engraver (Context *c) + : Auto_beam_engraver (c) +{ + last_grace_start_.main_part_.set_infinite (-1); + // grace_part_ is zero -> test_moment is false, last_grace_position_ + // not considered. +} + +bool +Grace_auto_beam_engraver::is_same_grace_state (Moment, Moment) +{ + // This is for ignoring interspersed grace notes in main note + // beaming. We never want to ignore something inside of grace note + // beaming, so return true. + return true; +} + +void +Grace_auto_beam_engraver::process_music () +{ + Moment now = now_mom (); + // Update last_grace_start_ and last_grace_position_ only when the + // main time advances. + if (now.main_part_ > last_grace_start_.main_part_) + { + last_grace_start_ = now; + last_grace_position_ = measure_position (context ()); + } + + Auto_beam_engraver::process_music (); +} + +bool +Grace_auto_beam_engraver::test_moment (Direction dir, Moment test_mom, Moment) +{ + // If no grace group started this main moment, we have no business + // beaming. Same if we have left the original main time step. + if (!last_grace_start_.grace_part_ + || last_grace_position_.main_part_ != test_mom.main_part_) + return false; + // Autobeam start only when at the start of the grace group. + if (dir == START) + return last_grace_position_ == test_mom; + // Autobeam end only when the grace part is finished. + return !test_mom.grace_part_; +} + +void +Grace_auto_beam_engraver::boot () +{ + ADD_LISTENER (Grace_auto_beam_engraver, beam_forbid); + ADD_ACKNOWLEDGER (Grace_auto_beam_engraver, stem); + ADD_ACKNOWLEDGER (Grace_auto_beam_engraver, bar_line); + ADD_ACKNOWLEDGER (Grace_auto_beam_engraver, beam); + ADD_ACKNOWLEDGER (Grace_auto_beam_engraver, breathing_sign); + ADD_ACKNOWLEDGER (Grace_auto_beam_engraver, rest); +} + +ADD_TRANSLATOR (Grace_auto_beam_engraver, + /* doc */ + "Generates one autobeam group across an entire grace phrase. " + " As usual, any manual beaming or @code{\\noBeam} will block" + " autobeaming, just like setting the context property" + " @samp{autoBeaming} to @code{##f}.", + + /* create */ + "Beam ", + + /* read */ + "autoBeaming ", + + /* write */ + "" + );