5 ## generate doc/luadoc.json.gz (lua binding doc)
6 # ./waf configure --luadoc ....
8 # ./gtk2_ardour/arluadoc > doc/luadoc.json.gz
10 ## generate doc/ardourapi.json.gz (ardour header doxygen doc)
11 # cd ../../tools/doxy2json
15 ## format HTML (using this scripterl)
16 # php tools/fmt-luadoc.php > /tmp/luadoc.html
19 $options = getopt("m");
20 if (isset ($options['m'])) {
21 $HTMLOUTPUT = false; ## set to false to output ardour-manual
23 $HTMLOUTPUT = true; ## set to false to output ardour-manual
26 ################################################################################
27 ################################################################################
29 $json = gzdecode (file_get_contents (dirname (__FILE__).'/../doc/luadoc.json.gz'));
32 foreach (json_decode ($json, true) as $b) {
33 if (!isset ($b['type'])) {
34 if (isset ($b['version'])) { $ardourversion = $b['version']; }
38 $b ['lua'] = preg_replace ('/:_end/', ':end', $b ['lua']);
39 $b ['lua'] = preg_replace ('/:_type/', ':type', $b ['lua']);
40 $b ['ldec'] = preg_replace ('/ const/', '', preg_replace ('/ const&/', '', $b['decl']));
41 if (isset ($b['ret'])) {
42 $b['ret'] = preg_replace ('/ const/', '', preg_replace ('/ const&/', '', $b['ret']));
47 if (count ($doc) == 0) {
48 fwrite (STDERR, "Failed to read luadoc.json\n");
52 ################################################################################
53 ## Global result variables
54 ################################################################################
56 $classlist = array ();
57 $constlist = array ();
60 ################################################################################
61 ## Pre-process the data, collect functions, parse arguments, cross reference
62 ################################################################################
65 ################################################################################
66 # some internal helper functions first
72 function my_die ($msg) {
73 fwrite (STDERR, $msg."\n");
77 ##function ptr_strip ($ctype) {
78 # # boost::shared_ptr<std::list<boost::shared_ptr<ARDOUR::Route>> > >
79 # # -> std::list<ARDOUR::Route>
80 # $ctype = preg_replace ('/boost::shared_ptr<([^>]*)[ ]*>/', '$1', $ctype);
81 # return preg_replace ('/boost::shared_ptr<([^>]*)[ ]*>/', '$1', $ctype);
84 function arg2lua ($argtype, $flags = 0) {
88 # LuaBridge abstracts C++ references
89 $flags |= preg_match ('/&$/', $argtype);
90 $arg = preg_replace ('/&$/', '', $argtype);
91 $arg = preg_replace ('/ $/', '', $arg);
93 # filter out basic types
94 $builtin = array ('float', 'double', 'bool', 'std::string', 'int', 'long', 'unsigned long', 'unsigned int', 'unsigned char', 'char', 'void', 'char*', 'unsigned char*', 'void*');
95 if (in_array ($arg, $builtin)) {
96 return array ($arg => $flags);
99 # check Class declarations first
100 foreach (array_merge ($classes, $consts) as $b) {
101 if ($b['ldec'] == $arg) {
102 return array ($b['lua'] => $flags);
106 # strip class pointers -- TODO Check C'tor for given class
107 $arg = preg_replace ('/[&*]*$/', '', $argtype);
108 foreach (array_merge ($classes, $consts) as $b) {
109 if ($b['ldec'] == $arg) {
110 return array ($b['lua'] => $flags);
114 return array ($argtype => ($flags | 4));
116 return array ('--MISSING (' . $argtype . ')--' => ($flags | 4));
120 function stripclass ($classname, $name) {
122 if (strpos ($name, $classname) !== 0) {
123 my_die ('invalid class prefix: ' .$classname. ' -- '. $name);
125 return substr ($name, strlen ($classname));
128 function datatype ($decl) {
129 # TODO handle spaces in type. Works because
130 # we don't yet have templated types (with_space <here >)
131 return substr ($decl, 0, strrpos ($decl, ' '));
134 function luafn2class ($lua) {
135 return substr ($lua, 0, strrpos ($lua, ':'));
138 function luafn2name ($lua) {
139 $fn = strrpos ($lua, ':');
140 if ($fn !== 0 && strlen($lua) > $fn + 1) {
141 return substr ($lua, $fn + 1);
143 my_die ('invalid class prefix: '. $name);
147 function checkclass ($b) {
149 if (!isset ($classlist[luafn2class ($b['lua'])])) {
150 my_die ('MISSING CLASS FOR '. print_r ($b['lua'], true));
154 # parse functions argument list to lua-names
155 function decl2args ($decl) {
156 $start = strrpos ($decl, '(');
157 $end = strrpos ($decl, ')');
158 $args = substr ($decl, $start + 1, $end - $start - 1);
159 $arglist = preg_split ('/, */', $args);
161 foreach ($arglist as $a) {
162 if (empty ($a)) { continue; }
163 $rv[] = arg2lua ($a);
168 function canonical_ctor ($b) {
170 if (preg_match('/[^(]*\(([^)*]*)\*\)(\(.*\))/', $b['decl'], $matches)) {
171 $lc = luafn2class ($b['lua']);
172 $cn = str_replace (':', '::', $lc);
173 $fn = substr ($lc, 1 + strrpos ($lc, ':'));
174 $rv = $cn . '::'. $fn . $matches[2];
179 function canonical_decl ($b) {
182 # match clang's declatation format
183 if (preg_match('/[^(]*\(([^)*]*)\*\)\((.*)\)/', $b['decl'], $matches)) {
184 if (strpos ($b['type'], 'Free Function') !== false) {
185 $pfx = str_replace (':', '::', luafn2class ($b['lua'])) . '::';
187 $fn = substr ($b['lua'], 1 + strrpos ($b['lua'], ':'));
188 $rv = $matches[1] . $fn . '(';
189 $arglist = preg_split ('/, */', $matches[2]);
191 foreach ($arglist as $a) {
192 if (!$first) { $rv .= ', '; }; $first = false;
193 if (empty ($a)) { continue; }
194 $a = preg_replace ('/([^>]) >/', '$1>', $a);
195 $a = preg_replace ('/^Cairo::/', '', $a); // special case cairo enums
196 $a = preg_replace ('/([^ ])&/', '$1 &', $a);
197 $a = str_replace ('vector', 'std::vector', $a);
198 $a = str_replace ('std::string', 'string', $a);
199 $a = str_replace ('string const', 'const string', $a);
200 $a = str_replace ('string', 'std::string', $a);
208 ################################################################################
209 # step 1: build class indices
211 foreach ($doc as $b) {
212 if (strpos ($b['type'], "[C] ") === 0) {
214 $classlist[$b['lua']] = $b;
215 if (strpos ($b['type'], 'Pointer Class') === false) {
216 $classdecl[$b['ldec']] = $b;
221 foreach ($classes as $c) {
222 if (strpos ($c['type'], 'Pointer Class') !== false) { continue; }
223 if (isset ($c['parent'])) {
224 if (isset ($classdecl[$c['parent']])) {
225 $classlist[$c['lua']]['luaparent'][] = $classdecl[$c['parent']]['lua'];
227 my_die ('unknown parent class: ' . print_r ($c, true));
232 # step 2: extract constants/enum
233 foreach ($doc as $b) {
234 switch ($b['type']) {
235 case "Constant/Enum":
236 case "Constant/Enum Member":
237 if (strpos ($b['ldec'], '::') === false) {
238 # for extern c enums, use the Lua Namespace
239 $b['ldec'] = str_replace (':', '::', luafn2class ($b['lua']));
241 $ns = str_replace ('::', ':', $b['ldec']);
242 $constlist[$ns][] = $b;
252 # step 3: process functions
253 foreach ($doc as $b) {
254 switch ($b['type']) {
256 case "Weak/Shared Pointer Constructor":
258 $classlist[luafn2class ($b['lua'])]['ctor'][] = array (
259 'name' => luafn2class ($b['lua']),
260 'args' => decl2args ($b['ldec']),
261 'cand' => canonical_ctor ($b)
266 $classlist[luafn2class ($b['lua'])]['data'][] = array (
268 'ret' => arg2lua (datatype ($b['ldec']))
271 case "Static C Function":
273 if (strpos ($b['lua'], 'ARDOUR:DataType:') === 0) {
274 # special case ARDOUR:DataType convenience c'tor
276 $ret = array (luafn2class ($b['lua']) => 0);
277 $canon = 'ARDOUR::LuaAPI::datatype_ctor_'.strtolower (luafn2name ($b['lua'])).'(lua_State*)';
279 my_die ('unhandled Static C: ' . print_r($b, true));
281 $classlist[luafn2class ($b['lua'])]['func'][] = array (
292 # we required C functions to be in a class namespace
293 case "Ext C Function":
295 $args = array (array ('--lua--' => 0));
296 $ret = array ('...' => 0);
297 $ns = luafn2class ($b['lua']);
298 $cls = $classlist[$ns];
299 if (preg_match ('/.*<([^>]*)[ ]*>/', $cls['ldec'], $templ)) {
300 # std::vector, std::list types
301 switch (stripclass($ns, $b['lua'])) {
303 #$args = array (array ('LuaTable {'.$templ[1].'}' => 0));
304 $args = array (arg2lua ($templ[1], 2));
305 $ret = array ('LuaTable' => 0);
309 $ret = array ('LuaIter' => 0);
313 $ret = array ('LuaTable' => 0);
318 } else if (strpos ($cls['type'], ' Array') !== false) {
319 # catches C:FloatArray, C:IntArray
320 $templ = preg_replace ('/[&*]*$/', '', $cls['ldec']);
321 switch (stripclass($ns, $b['lua'])) {
324 $ret = array ('LuaMetaTable' => 0);
328 $ret = array ('LuaTable' => 0);
331 $args = array (array ('LuaTable {'.$templ.'}' => 0));
332 $ret = array ('void' => 0);
338 $classlist[luafn2class ($b['lua'])]['func'][] = array (
345 'cand' => canonical_decl ($b)
348 case "Free C Function":
349 $funclist[luafn2class ($b['lua'])][] = array (
356 'cand' => str_replace (':', '::', $b['lua']).'(lua_State*)'
359 case "Free Function":
360 case "Free Function RefReturn":
361 $funclist[luafn2class ($b['lua'])][] = array (
364 'args' => decl2args ($b['ldec']),
365 'ret' => arg2lua ($b['ret']),
366 'ref' => (strpos ($b['type'], "RefReturn") !== false),
367 'cand' => canonical_decl ($b)
370 case "Member Function":
371 case "Member Function RefReturn":
372 case "Member Pointer Function":
373 case "Weak/Shared Pointer Function":
374 case "Weak/Shared Pointer Function RefReturn":
375 case "Weak/Shared Null Check":
376 case "Static Member Function":
378 $classlist[luafn2class ($b['lua'])]['func'][] = array (
381 'args' => decl2args ($b['ldec']),
382 'ret' => arg2lua ($b['ret']),
383 'ref' => (strpos ($b['type'], "RefReturn") !== false),
384 'cand' => canonical_decl ($b)
387 case "Weak/Shared Pointer Cast":
389 $classlist[luafn2class ($b['lua'])]['cast'][] = array (
392 'args' => decl2args ($b['ldec']),
393 'ret' => arg2lua ($b['ret']),
394 'ref' => (strpos ($b['type'], "RefReturn") !== false),
395 'cand' => canonical_decl ($b)
398 case "Constant/Enum":
399 case "Constant/Enum Member":
400 # already handled -> $consts
403 if (strpos ($b['type'], "[C] ") !== 0) {
404 my_die ('unhandled type: ' . $b['type']);
411 # step 4: collect/group/sort
413 # step 4a: unify weak/shared Ptr classes
414 foreach ($classlist as $ns => $cl) {
415 if (strpos ($cl['type'], ' Array') !== false) {
416 $classlist[$ns]['arr'] = true;
419 foreach ($classes as $c) {
420 if ($c['lua'] == $ns) {
421 if (strpos ($c['type'], 'Pointer Class') !== false) {
422 $classlist[$ns]['ptr'] = true;
423 $classlist[$ns]['decl'] = 'boost::shared_ptr< '.$c['decl']. ' >, boost::weak_ptr< '.$c['decl']. ' >';
430 # step4b: sanity check
431 foreach ($classlist as $ns => $cl) {
432 if (isset ($classes[$ns]['parent']) && !isset ($classlist[$ns]['luaparent'])) {
433 my_die ('missing parent class: ' . print_r ($cl, true));
437 # step 4c: merge free functions into classlist
438 foreach ($funclist as $ns => $fl) {
439 if (isset ($classlist[$ns])) {
440 my_die ('Free Funcion in existing namespace: '.$ns.' '. print_r ($ns, true));
442 $classlist[$ns]['func'] = $fl;
443 $classlist[$ns]['free'] = true;
446 # step 4d: order to chaos
447 # no array_multisort() here, sub-types are sorted after merging parents
451 ################################################################################
452 ################################################################################
453 ################################################################################
456 #### -- split here -- ####
458 # from here on, only $classlist and $constlist arrays are relevant.
459 # we also pull in C++ header annotation from doxygen to $api
462 # read documentation from doxygen
463 $json = gzdecode (file_get_contents (dirname (__FILE__).'/../doc/ardourapi.json.gz'));
465 foreach (json_decode ($json, true) as $a) {
466 if (!isset ($a['decl'])) { continue; }
467 if (empty ($a['decl'])) { continue; }
468 $canon = str_replace (' *', '*', $a['decl']);
472 # keep track of found/missing doc
476 # retrive a value from $api
477 function doxydoc ($canonical_declaration) {
481 if (isset ($api[$canonical_declaration])) {
483 return $api[$canonical_declaration]['doc'];
490 ################################################################################
492 ################################################################################
495 ################################################################################
499 # constructors, enums (constants) use a dot. (e.g. "LuaOSC.Address" -> "LuaOSC.Address" )
500 function ctorname ($name) {
501 return htmlentities (str_replace (':', '.', $name));
504 # strip class prefix (e.g "Evoral:MidiEvent:channel" -> "channel")
505 function shortname ($name) {
506 return htmlentities (substr ($name, strrpos ($name, ':') + 1));
509 # retrieve variable name from array["VARNAME"] => FLAGS
510 function varname ($a) {
511 return array_keys ($a)[0];
514 # recusively collect class parents (derived classes)
515 function traverse_parent ($ns, &$inherited) {
518 if (isset ($classlist[$ns]['luaparent'])) {
519 $parents = array_unique ($classlist[$ns]['luaparent']);
521 foreach ($parents as $p) {
522 if (!empty ($rv)) { $rv .= ', '; }
523 $rv .= typelink ($p);
524 $inherited[$p] = $classlist[$p];
525 traverse_parent ($p, $inherited);
531 # create a cross-reference to a type (class or enum)
532 # *all* <a> links are generated here, currently anchors on a single page.
533 function typelink ($a, $short = false, $argcls = '', $linkcls = '', $suffix = '') {
536 if (isset($classlist[$a]['free'])) {
537 return '<a class="'.$linkcls.'" href="#'.htmlentities ($a).'">'.($short ? shortname($a) : ctorname($a)).$suffix.'</a>';
538 } else if (in_array ($a, array_keys ($classlist))) {
539 return '<a class="'.$linkcls.'" href="#'.htmlentities($a).'">'.($short ? shortname($a) : htmlentities($a)).$suffix.'</a>';
540 } else if (in_array ($a, array_keys ($constlist))) {
541 return '<a class="'.$linkcls.'" href="#'.ctorname ($a).'">'.($short ? shortname($a) : ctorname($a)).$suffix.'</a>';
543 return '<span class="'.$argcls.'">'.htmlentities($a).$suffix.'</span>';
547 # output format function arguments
548 function format_args ($args) {
549 $rv = '<span class="functionargs"> (';
551 foreach ($args as $a) {
552 if (!$first) { $rv .= ', '; }; $first = false;
553 $flags = $a[varname ($a)];
555 $rv .= '<em>LuaTable</em> {'.typelink (varname ($a), true, 'em').'}';
557 elseif ($flags & 1) {
558 $rv .= typelink (varname ($a), true, 'em', '', '&');
561 $rv .= typelink (varname ($a), true, 'em');
568 # format doxygen documentation for class-definition
569 function format_doxyclass ($cl) {
571 if (isset ($cl['decl'])) {
572 $doc = doxydoc ($cl['decl']);
574 $rv.= '<div class="classdox">'.$doc.'</div>'.NL;
580 # format doxygen documentation for class-members
581 function format_doxydoc ($f) {
583 if (isset ($f['cand'])) {
584 $doc = doxydoc ($f['cand']);
586 $rv.= '<tr><td></td><td class="doc" colspan="2"><div class="dox">'.$doc;
587 $rv.= '</div></td></tr>'.NL;
588 } else if (0) { # debug
589 $rv.= '<tr><td></td><td class="doc" colspan="2"><p>'.htmlentities($f['cand']).'</p>';
590 $rv.= '</td></tr>'.NL;
596 # usort() callback for class-members
597 function name_sort_cb ($a, $b) {
598 return strcmp ($a['name'], $b['name']);
601 # main output function for every class
602 function format_class_members ($ns, $cl, &$dups) {
604 # print contructor - if any
605 if (isset ($cl['ctor'])) {
606 usort ($cl['ctor'], 'name_sort_cb');
607 $rv.= ' <tr><th colspan="3">Constructor</th></tr>'.NL;
608 foreach ($cl['ctor'] as $f) {
609 $rv.= ' <tr><td class="def">ℂ</td><td class="decl">';
610 $rv.= '<span class="functionname">'.ctorname ($f['name']).'</span>';
611 $rv.= format_args ($f['args']);
612 $rv.= '</td><td class="fill"></td></tr>'.NL;
613 # doxygen documentation (may be empty)
614 $rv.= format_doxydoc($f);
618 # strip duplicates (inherited or derived methods)
619 # e.g AudioTrack -> Track -> Route -> SessionObject -> Stateful
620 # all 5 have "isnil()"
622 if (isset ($cl['func'])) {
623 foreach ($cl['func'] as $f) {
624 if (in_array (stripclass ($ns, $f['name']), $dups)) { continue; }
629 # print methods - if any
630 if (count ($nondups) > 0) {
631 usort ($nondups, 'name_sort_cb');
632 $rv.= ' <tr><th colspan="3">Methods</th></tr>'.NL;
633 foreach ($nondups as $f) {
634 $dups[] = stripclass ($ns, $f['name']);
636 $rv.= ' <tr><td class="def">';
637 if ($f['ref'] && isset ($f['ext'])) {
638 # external C functions
639 $rv.= '<em>'.varname ($f['ret']).'</em>';
640 } elseif ($f['ref'] && varname ($f['ret']) == 'void') {
641 # void functions with reference args
642 $rv.= '<em>LuaTable</em>(...)';
643 } elseif ($f['ref']) {
644 # functions with reference args and return value
645 $rv.= '<em>LuaTable</em>('.typelink (varname ($f['ret']), true, 'em').', ...)';
647 # normal class members
648 $rv.= typelink (varname ($f['ret']), true, 'em');
650 # function declaration and arguments
651 $rv.= '</td><td class="decl">';
652 $rv.= '<span class="functionname"><abbr title="'.htmlentities($f['bind']['decl']).'">'.stripclass ($ns, $f['name']).'</abbr></span>';
653 $rv.= format_args ($f['args']);
654 $rv.= '</td><td class="fill"></td></tr>'.NL;
655 # doxygen documentation (may be empty)
656 $rv.= format_doxydoc($f);
659 # print cast - if any
660 if (isset ($cl['cast'])) {
661 usort ($cl['cast'], 'name_sort_cb');
662 $rv.= ' <tr><th colspan="3">Cast</th></tr>'.NL;
663 foreach ($cl['cast'] as $f) {
664 $rv.= ' <tr><td class="def">';
665 $rv.= typelink (varname ($f['ret']), true, 'em');
666 # function declaration and arguments
667 $rv.= '</td><td class="decl">';
668 $rv.= '<span class="functionname"><abbr title="'.htmlentities($f['bind']['decl']).'">'.stripclass ($ns, $f['name']).'</abbr></span>';
669 $rv.= format_args ($f['args']);
670 $rv.= '</td><td class="fill"></td></tr>'.NL;
671 # doxygen documentation (may be empty)
672 $rv.= format_doxydoc($f);
676 # print data members - if any
677 if (isset ($cl['data'])) {
678 usort ($cl['data'], 'name_sort_cb');
679 $rv.= ' <tr><th colspan="3">Data Members</th></tr>'.NL;
680 foreach ($cl['data'] as $f) {
681 $rv.= ' <tr><td class="def">'.typelink (array_keys ($f['ret'])[0], false, 'em').'</td><td class="decl">';
682 $rv.= '<span class="functionname">'.stripclass ($ns, $f['name']).'</span>';
683 $rv.= '</td><td class="fill"></td></tr>'.NL;
690 ################################################################################
696 <html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en">
698 <title>Ardour Lua Bindings</title>
699 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
700 <style type="text/css">
701 div.header { text-align:center; }
702 div.header h2 { margin:0; }
703 div.header p { margin:.25em; text-align:center; }
704 div.luafooter { text-align:center; font-size:80%; color: #888; margin: 2em 0; }
705 #luaref { max-width:60em; margin: 1em auto; }
707 #luaref h2 { margin:2em 0 0 0; padding:0em; border-bottom: 1px solid black; }
708 #luaref h3.cls { margin:2em 0 0 0; padding: 0 0 0 1em; border: 1px dashed #6666ee; }
709 #luaref h3.cls abbr { text-decoration:none; cursor:default; }
710 #luaref h4.cls { margin:1em 0 0 0; }
711 #luaref h3.class { background-color: #aaee66; }
712 #luaref h3.enum { background-color: #aaaaaa; }
713 #luaref h3.pointerclass { background-color: #eeaa66; }
714 #luaref h3.array { background-color: #66aaee; }
715 #luaref h3.opaque { background-color: #6666aa; }
716 #luaref p { text-align: justify; }
717 #luaref p.cdecl { text-align: right; float:right; font-size:90%; margin:0; padding: 0 0 0 1em; }
718 #luaref ul.classindex { columns: 2; -webkit-columns: 2; -moz-columns: 2; }
719 #luaref div.clear { clear:both; }
720 #luaref p.classinfo { margin: .25em 0; }
721 #luaref div.code { width:80%; margin:.5em auto; }
722 #luaref div.code div { width:45%; }
723 #luaref div.code pre { line-height: 1.2em; margin: .25em 0; }
724 #luaref div.code samp { color: green; font-weight: bold; background-color: #eee; }
725 #luaref div.classdox { padding: .1em 1em; }
726 #luaref div.classdox p { margin: .5em 0 .5em .6em; }
727 #luaref div.classdox p { margin: .5em 0 .5em .6em; }
728 #luaref div.classdox { padding: .1em 1em; }
729 #luaref div.classdox p { margin: .5em 0 .5em .6em; }
730 #luaref table.classmembers { width: 100%; }
731 #luaref table.classmembers th { text-align:left; border-bottom:1px solid black; padding-top:1em; }
732 #luaref table.classmembers td.def { text-align:right; padding-right:.5em; white-space: nowrap; }
733 #luaref table.classmembers td.decl { text-align:left; padding-left:.5em; white-space: nowrap; }
734 #luaref table.classmembers td.doc { text-align:left; padding-left:.6em; line-height: 1.2em; font-size:80%; }
735 #luaref table.classmembers td.doc div.dox {background-color:#eee; padding: .1em 1em; }
736 #luaref table.classmembers td.doc p { margin: .5em 0; }
737 #luaref table.classmembers td.doc p.para-brief { font-size:120%; }
738 #luaref table.classmembers td.doc p.para-returns { font-size:120%; }
739 #luaref table.classmembers td.doc dl { font-size:120%; line-height: 1.3em; }
740 #luaref table.classmembers td.doc dt { font-style: italic; }
741 #luaref table.classmembers td.fill { width: 99%; }
742 #luaref table.classmembers span.em { font-style: italic; }
743 #luaref span.functionname abbr { text-decoration:none; cursor:default; }
748 <h2>Ardour Lua Bindings</h2>
750 <a href="#h_classes">Class Documentation</a>
752 <a href="#h_enum">Enum/Constants</a>
754 <a href="#h_index">Index</a>
758 <!-- #### SNIP #### !-->
768 title: Class Reference
772 This documention is far from complete may be inaccurate and subject to change.
783 ################################################################################
784 # some general documentation -- should really go elsehere
788 <h2 id="h_intro">Overview</h2>
790 The top-level entry point are <?=typelink('ARDOUR:Session')?> and <?=typelink('ArdourUI:Editor')?>.
791 Most other Classes are used indirectly starting with a Session function. e.g. Session:get_routes().
794 A few classes are dedicated to certain script types, e.g. Lua DSP processors have exclusive access to
795 <?=typelink('ARDOUR:DSP')?> and <?=typelink('ARDOUR:ChanMapping')?>. Action Hooks Scripts to
796 <?=typelink('LuaSignal:Set')?> etc.
799 Detailed documentation (parameter names, method description) is not yet available. Please stay tuned.
801 <h3>Short introduction to Ardour classes</h3>
803 Ardour's structure is object oriented. The main object is the Session. A Session contains Audio Tracks, Midi Tracks and Busses.
804 Audio and Midi tracks are derived from a more general "Track" Object, which in turn is derived from a "Route" (aka Bus).
805 (We say "An Audio Track <em>is-a</em> Track <em>is-a</em> Route").
806 Tracks contain specifics. For Example a track <em>has-a</em> diskstream (for file i/o).
809 Operations are performed on objects. One gets a reference to an object and then calls a method.
810 e.g <code>obj = Session:route_by_name("Audio") obj:set_name("Guitar")</code>.
813 Lua automatically follows C++ class inheritance. e.g one can directly call all SessionObject and Route methods on Track object. However lua does not automatically promote objects. A Route object which just happens to be a Track needs to be explicily cast to a Track. Methods for casts are provided with each class. Note that the cast may fail and return a <em>nil</em> reference.
816 Likewise multiple inheritance is a <a href="http://www.lua.org/pil/16.3.html">non-trivial issue</a> in lua. To avoid performance penalties involved with lookups, explicit casts are required in this case. One example is <?=typelink('ARDOUR:SessionObject')?> which is-a StatefulDestructible which inhertis from both Stateful and Destructible.
819 Object lifetimes are managed by the Session. Most Objects cannot be directly created, but one asks the Session to create or destroy them. This is mainly due to realtime constrains:
820 you cannot simply remove a track that is currently processing audio. There are various <em>factory</em> methods for object creation or removal.
822 <h3>Pass by Reference</h3>
824 Since lua functions are closures, C++ methods that pass arguments by reference cannot be used as-is.
825 All parameters passed to a C++ method which uses references are returned as Lua Table.
826 If the C++ method also returns a value it is prefixed. Two parameters are returned: the value and a Lua Table holding the parameters.
830 <div style="float:left;">C++
832 <pre><code class="cxx">void set_ref (int& var, long& val)
834 printf ("%d %ld\n", var, val);
841 <div style="float:right;">Lua
843 <pre><code class="lua">local var = 0;
844 ref = set_ref (var, 2);
845 -- output from C++ printf()
846 </code><samp class="lua">0 2</samp><code>
847 -- var is still 0 here
848 print (ref[1], ref[2])
849 </code><samp class="lua">5 7</samp></pre>
853 <div class="clear"></div>
855 <div style="float:left;">
857 <pre><code class="cxx">int set_ref2 (int &var, std::string unused)
865 <div style="float:right;">
866 <pre><code class="lua">rv, ref = set_ref2 (0, "hello");
867 print (rv, ref[1], ref[2])
868 </code><samp class="lua">3 5 hello</samp></pre>
871 <div class="clear"></div>
873 <h3>Pointer Classes</h3>
875 Libardour makes extensive use of reference counted <code>boost::shared_ptr</code> to manage lifetimes.
876 The Lua bindings provide a complete abstration of this. There are no pointers in lua.
877 For example a <?=typelink('ARDOUR:Route')?> is a pointer in C++, but lua functions operate on it like it was a class instance.
880 <code>shared_ptr</code> are reference counted. Once assigned to a lua variable, the C++ object will be kept and remains valid.
881 It is good practice to assign references to lua <code>local</code> variables or reset the variable to <code>nil</code> to drop the ref.
884 All pointer classes have a <code>isnil ()</code> method. This is for two cases:
885 Construction may fail. e.g. <code><?=typelink('ARDOUR:LuaAPI')?>.newplugin()</code>
886 may not be able to find the given plugin and hence cannot create an object.
889 The second case if for <code>boost::weak_ptr</code>. As opposed to <code>boost::shared_ptr</code> weak-pointers are not reference counted.
890 The object may vanish at any time.
891 If lua code calls a method on a nil object, the interpreter will raise an exception and the script will not continue.
892 This is not unlike <code>a = nil a:test()</code> which results in en error "<em>attempt to index a nil value</em>".
895 From the lua side of things there is no distinction between weak and shared pointers. They behave identically.
896 Below they're inidicated in orange and have an arrow to indicate the pointer type.
897 Pointer Classes cannot be created in lua scripts. It always requires a call to C++ to create the Object and obtain a reference to it.
903 #################################
904 # Main output function -- Classes
906 echo '<h2 id="h_classes">Class Documentation</h2>'.NL;
907 foreach ($classlist as $ns => $cl) {
909 $tbl = format_class_members ($ns, $cl, $dups);
911 # format class title - depending on type
913 # classes with no members (no ctor, no methods, no data)
914 echo '<h3 id="'.htmlentities ($ns).'" class="cls opaque"><abbr title="Opaque Object">∅</abbr> '.htmlentities ($ns).'</h3>'.NL;
916 else if (isset ($classlist[$ns]['free'])) {
917 # free functions (no class)
918 echo '<h3 id="'.htmlentities ($ns).'" class="cls freeclass"><abbr title="Namespace">ℕ</abbr> '.ctorname($ns).'</h3>'.NL;
920 else if (isset ($classlist[$ns]['arr'])) {
922 echo '<h3 id="'.htmlentities ($ns).'" class="cls array"><abbr title="C Array">⋯</abbr> '.htmlentities ($ns).'</h3>'.NL;
924 else if (isset ($classlist[$ns]['ptr'])) {
926 echo '<h3 id="'.htmlentities ($ns).'" class="cls pointerclass"><abbr title="Pointer Class">↠</abbr> '. htmlentities ($ns).'</h3>'.NL;
930 echo '<h3 id="'.htmlentities ($ns).'" class="cls class"><abbr title="Class">∁</abbr> '.htmlentities ($ns).'</h3>'.NL;
933 # show original C++ declaration
934 if (isset ($cl['decl'])) {
935 echo '<p class="cdecl"><em>C‡</em>: '.htmlentities ($cl['decl']).'</p>'.NL;
938 # print class inheritance (direct parent *name* only)
939 $inherited = array ();
940 $isa = traverse_parent ($ns, $inherited);
942 echo ' <p class="classinfo">is-a: '.$isa.'</p>'.NL;
944 echo '<div class="clear"></div>'.NL;
947 # class documentation (if any)
948 echo format_doxyclass ($cl);
950 # member documentation
952 echo '<p class="classinfo">This class object is only used indirectly as return-value and function-parameter. It provides no methods by itself.</p>'.NL;
954 echo '<table class="classmembers">'.NL;
959 # traverse parent classes (all inherited members)
960 foreach ($inherited as $pns => $pcl) {
961 $tbl = format_class_members ($pns, $pcl, $dups);
963 echo '<h4 class="cls">Inherited from '.$pns.'</h4>'.NL;
964 echo '<table class="classmembers">'.NL;
974 echo '<h2 id="h_enum">Enum/Constants</h2>'.NL;
975 foreach ($constlist as $ns => $cs) {
976 echo '<h3 id="'.ctorname ($ns).'" class="cls enum"><abbr title="Enum">∈</abbr> '.ctorname ($ns).'</h3>'.NL;
977 echo '<ul class="enum">'.NL;
978 foreach ($cs as $c) {
979 echo '<li class="const">'.ctorname ($c['lua']).'</li>'.NL;
984 ######################
985 # Index of all classes
987 echo '<h2 id="h_index" >Class Index</h2>'.NL;
988 echo '<ul class="classindex">'.NL;
989 foreach ($classlist as $ns => $cl) {
990 echo '<li>'.typelink($ns).'</li>'.NL;
995 # see how far there is still to go...
996 fwrite (STDERR, "Found $dox_found annotations. missing: $dox_miss\n");
997 echo '<!-- '.$dox_found.' / '.$dox_miss.' !-->'.NL;
1001 <div class="luafooter">Ardour <?=$ardourversion?> - <?=date('r')?></div>
1005 echo '<!-- #### SNIP #### !-->'.NL;