836 lines
26 KiB
PHP
Executable File
836 lines
26 KiB
PHP
Executable File
#!/usr/bin/php
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<?php
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## USAGE
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#
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## generate doc/luadoc.json.gz (lua binding doc)
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# ./waf configure --luadoc ....
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# ./waf
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# ./gtk2_ardour/arluadoc > doc/luadoc.json.gz
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#
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## generate doc/ardourapi.json.gz (ardour header doxygen doc)
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# cd ../../tools/doxy2json
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# ./ardourdoc.sh
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# cd -
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#
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## format HTML (using this scripterl)
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# php tools/fmt-luadoc.php > /tmp/luadoc.html
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#
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################################################################################
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################################################################################
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$json = gzdecode (file_get_contents (dirname (__FILE__).'/../doc/luadoc.json.gz'));
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$doc = array ();
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foreach (json_decode ($json, true) as $b) {
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if (!isset ($b['type'])) { continue; }
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$b ['ldec'] = preg_replace ('/ const/', '', preg_replace ('/ const&/', '', $b['decl']));
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if (isset ($b['ret'])) {
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$b['ret'] = preg_replace ('/ const/', '', preg_replace ('/ const&/', '', $b['ret']));
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}
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$doc[] = $b;
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}
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if (count ($doc) == 0) {
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fwrite (STDERR, "Failed to read luadoc.json\n");
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exit (1);
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}
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################################################################################
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## Global result variables
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################################################################################
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$classlist = array ();
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$constlist = array ();
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################################################################################
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## Pre-process the data, collect functions, parse arguments, cross reference
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################################################################################
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################################################################################
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# some internal helper functions first
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$funclist = array ();
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$classes = array ();
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$consts = array ();
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function my_die ($msg) {
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fwrite (STDERR, $msg."\n");
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exit (1);
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}
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##function ptr_strip ($ctype) {
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# # boost::shared_ptr<std::list<boost::shared_ptr<ARDOUR::Route>> > >
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# # -> std::list<ARDOUR::Route>
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# $ctype = preg_replace ('/boost::shared_ptr<([^>]*)[ ]*>/', '$1', $ctype);
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# return preg_replace ('/boost::shared_ptr<([^>]*)[ ]*>/', '$1', $ctype);
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#}
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function arg2lua ($argtype, $flags = 0) {
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global $classes;
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global $consts;
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# LuaBridge abstracts C++ references
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$flags |= preg_match ('/&$/', $argtype);
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$arg = preg_replace ('/&$/', '', $argtype);
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$arg = preg_replace ('/ $/', '', $arg);
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# filter out basic types
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$builtin = array ('float', 'double', 'bool', 'std::string', 'int', 'long', 'unsigned long', 'unsigned int', 'unsigned char', 'char', 'void', 'char*', 'unsigned char*', 'void*');
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if (in_array ($arg, $builtin)) {
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return array ($arg => $flags);
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}
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# check Class declarations first
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foreach (array_merge ($classes, $consts) as $b) {
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if ($b['ldec'] == $arg) {
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return array ($b['lua'] => $flags);
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}
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}
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# strip class pointers -- TODO Check C'tor for given class
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$arg = preg_replace ('/[&*]*$/', '', $argtype);
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foreach (array_merge ($classes, $consts) as $b) {
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if ($b['ldec'] == $arg) {
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return array ($b['lua'] => $flags);
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}
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}
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if ($flags & 2) {
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return array ($argtype => ($flags | 4));
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} else {
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return array ('--MISSING (' . $argtype . ')--' => ($flags | 4));
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}
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}
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function stripclass ($classname, $name) {
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$classname .= ':';
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if (strpos ($name, $classname) !== 0) {
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my_die ('invalid class prefix: ' .$classname. ' -- '. $name);
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}
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return substr ($name, strlen ($classname));
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}
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function datatype ($decl) {
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# TODO handle spaces in type. Works because
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# we don't yet have templated types (with_space <here >)
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return substr ($decl, 0, strpos ($decl, ' '));
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}
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function luafn2class ($lua) {
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return substr ($lua, 0, strrpos ($lua, ':'));
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}
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function checkclass ($b) {
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global $classlist;
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if (!isset ($classlist[luafn2class ($b['lua'])])) {
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my_die ('MISSING CLASS FOR '. print_r ($b['lua'], true));
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}
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}
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# parse functions argument list to lua-names
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function decl2args ($decl) {
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$start = strrpos ($decl, '(');
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$end = strrpos ($decl, ')');
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$args = substr ($decl, $start + 1, $end - $start - 1);
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$arglist = preg_split ('/, */', $args);
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$rv = array ();
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foreach ($arglist as $a) {
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if (empty ($a)) { continue; }
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$rv[] = arg2lua ($a);
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}
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return $rv;
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}
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function canonical_ctor ($b) {
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$rv = '';
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if (preg_match('/[^(]*\(([^)*]*)\*\)(\(.*\))/', $b['decl'], $matches)) {
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$lc = luafn2class ($b['lua']);
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$cn = str_replace (':', '::', $lc);
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$fn = substr ($lc, 1 + strrpos ($lc, ':'));
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$rv = $cn . '::'. $fn . $matches[2];
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}
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return $rv;
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}
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function canonical_decl ($b) {
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$rv = '';
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$pfx = '';
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# match clang's declatation format
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if (preg_match('/[^(]*\(([^)*]*)\*\)\((.*)\)/', $b['decl'], $matches)) {
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if (strpos ($b['type'], 'Free Function') !== false) {
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$pfx = str_replace (':', '::', luafn2class ($b['lua'])) . '::';
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}
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$fn = substr ($b['lua'], 1 + strrpos ($b['lua'], ':'));
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$rv = $matches[1] . $fn . '(';
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$arglist = preg_split ('/, */', $matches[2]);
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$first = true;
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foreach ($arglist as $a) {
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if (!$first) { $rv .= ', '; }; $first = false;
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if (empty ($a)) { continue; }
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$a = preg_replace ('/([^>]) >/', '$1>', $a);
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$a = preg_replace ('/^Cairo::/', '', $a); // special case cairo enums
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$a = preg_replace ('/([^ ])&/', '$1 &', $a);
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$a = str_replace ('vector', 'std::vector', $a);
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$a = str_replace ('std::string', 'string', $a);
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$a = str_replace ('string const', 'const string', $a);
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$a = str_replace ('string', 'std::string', $a);
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$rv .= $a;
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}
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$rv .= ')';
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}
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return $pfx . $rv;
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}
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################################################################################
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# step 1: build class indices
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foreach ($doc as $b) {
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if (strpos ($b['type'], "[C] ") === 0) {
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$classes[] = $b;
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$classlist[$b['lua']] = $b;
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if (strpos ($b['type'], 'Pointer Class') === false) {
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$classdecl[$b['ldec']] = $b;
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}
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}
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}
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foreach ($classes as $c) {
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if (strpos ($c['type'], 'Pointer Class') !== false) { continue; }
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if (isset ($c['parent'])) {
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if (isset ($classdecl[$c['parent']])) {
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$classlist[$c['lua']]['luaparent'][] = $classdecl[$c['parent']]['lua'];
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} else {
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my_die ('unknown parent class: ' . print_r ($c, true));
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}
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}
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}
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# step 2: extract constants/enum
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foreach ($doc as $b) {
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switch ($b['type']) {
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case "Constant/Enum":
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case "Constant/Enum Member":
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if (strpos ($b['ldec'], '::') === false) {
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# for extern c enums, use the Lua Namespace
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$b['ldec'] = str_replace (':', '::', luafn2class ($b['lua']));
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}
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$ns = str_replace ('::', ':', $b['ldec']);
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$constlist[$ns][] = $b;
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# arg2lua lookup
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$b['lua'] = $ns;
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$consts[] = $b;
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break;
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default:
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break;
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}
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}
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# step 3: process functions
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foreach ($doc as $b) {
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switch ($b['type']) {
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case "Constructor":
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case "Weak/Shared Pointer Constructor":
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checkclass ($b);
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$classlist[luafn2class ($b['lua'])]['ctor'][] = array (
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'name' => luafn2class ($b['lua']),
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'args' => decl2args ($b['ldec']),
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'cand' => canonical_ctor ($b)
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);
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break;
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case "Data Member":
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checkclass ($b);
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$classlist[luafn2class ($b['lua'])]['data'][] = array (
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'name' => $b['lua'],
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'ret' => arg2lua (datatype ($b['ldec']))
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);
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break;
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case "C Function":
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# we required C functions to be in a class namespace
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case "Ext C Function":
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checkclass ($b);
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$args = array (array ('--lua--' => 0));
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$ret = array ('...' => 0);
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$ns = luafn2class ($b['lua']);
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$cls = $classlist[$ns];
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## std::Vector std::List types
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if (preg_match ('/.*<([^>]*)[ ]*>/', $cls['ldec'], $templ)) {
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// XXX -> move to C-source
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switch (stripclass($ns, $b['lua'])) {
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case 'add':
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#$args = array (array ('LuaTable {'.$templ[1].'}' => 0));
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$args = array (arg2lua ($templ[1], 2));
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$ret = array ('LuaTable' => 0);
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break;
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case 'iter':
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$args = array ();
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$ret = array ('LuaIter' => 0);
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break;
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case 'table':
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$args = array ();
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$ret = array ('LuaTable' => 0);
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break;
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default:
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break;
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}
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} else if (strpos ($cls['type'], ' Array') !== false) {
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$templ = preg_replace ('/[&*]*$/', '', $cls['ldec']);
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switch (stripclass($ns, $b['lua'])) {
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case 'array':
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$args = array ();
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$ret = array ('LuaMetaTable' => 0);
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break;
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case 'get_table':
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$args = array ();
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$ret = array ('LuaTable' => 0);
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break;
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case 'set_table':
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$args = array (array ('LuaTable {'.$templ.'}' => 0));
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$ret = array ('void' => 0);
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break;
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default:
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break;
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}
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}
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$classlist[luafn2class ($b['lua'])]['func'][] = array (
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'bind' => $b,
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'name' => $b['lua'],
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'args' => $args,
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'ret' => $ret,
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'ref' => true,
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'ext' => true,
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'cand' => canonical_decl ($b)
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);
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break;
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case "Free Function":
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case "Free Function RefReturn":
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$funclist[luafn2class ($b['lua'])][] = array (
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'bind' => $b,
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'name' => $b['lua'],
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'args' => decl2args ($b['ldec']),
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'ret' => arg2lua ($b['ret']),
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'ref' => (strpos ($b['type'], "RefReturn") !== false),
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'cand' => canonical_decl ($b)
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);
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break;
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case "Member Function":
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case "Member Function RefReturn":
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case "Member Pointer Function":
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case "Weak/Shared Pointer Function":
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case "Weak/Shared Pointer Function RefReturn":
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case "Weak/Shared Null Check":
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case "Weak/Shared Pointer Cast":
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case "Static Member Function":
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checkclass ($b);
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$classlist[luafn2class ($b['lua'])]['func'][] = array (
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'bind' => $b,
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'name' => $b['lua'],
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'args' => decl2args ($b['ldec']),
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'ret' => arg2lua ($b['ret']),
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'ref' => (strpos ($b['type'], "RefReturn") !== false),
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'cand' => canonical_decl ($b)
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);
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break;
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case "Constant/Enum":
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case "Constant/Enum Member":
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# already handled -> $consts
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break;
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default:
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if (strpos ($b['type'], "[C] ") !== 0) {
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my_die ('unhandled type: ' . $b['type']);
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}
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break;
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}
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}
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# step 4: collect/group/sort
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# step 4a: unify weak/shared Ptr classes
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foreach ($classlist as $ns => $cl) {
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if (strpos ($cl['type'], ' Array') !== false) {
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$classlist[$ns]['arr'] = true;
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continue;
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}
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foreach ($classes as $c) {
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if ($c['lua'] == $ns) {
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if (strpos ($c['type'], 'Pointer Class') !== false) {
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$classlist[$ns]['ptr'] = true;
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$classlist[$ns]['decl'] = 'boost::shared_ptr< '.$c['decl']. ' >, boost::weak_ptr< '.$c['decl']. ' >';
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break;
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}
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}
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}
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}
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# step4b: sanity check
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foreach ($classlist as $ns => $cl) {
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if (isset ($classes[$ns]['parent']) && !isset ($classlist[$ns]['luaparent'])) {
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my_die ('missing parent class: ' . print_r ($cl, true));
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}
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}
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# step 4c: merge free functions into classlist
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foreach ($funclist as $ns => $fl) {
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if (isset ($classlist[$ns])) {
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my_die ('Free Funcion in existing namespace: '.$ns.' '. print_r ($ns, true));
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}
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$classlist[$ns]['func'] = $fl;
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$classlist[$ns]['free'] = true;
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}
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# step 4d: order to chaos
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# no array_multisort() here, sub-types are sorted after merging parents
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ksort ($classlist);
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################################################################################
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################################################################################
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################################################################################
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#### -- split here -- ####
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# from here on, only $classlist and $constlist arrays are relevant.
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# read function documentation from doxygen
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$json = gzdecode (file_get_contents (dirname (__FILE__).'/../doc/ardourapi.json.gz'));
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$api = array ();
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foreach (json_decode ($json, true) as $a) {
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if (!isset ($a['decl'])) { continue; }
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if (empty ($a['decl'])) { continue; }
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$canon = str_replace (' *', '*', $a['decl']);
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$api[$canon] = $a;
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}
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$dox_found = 0;
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$dox_miss = 0;
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function doxydoc ($canonical_declaration) {
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global $api;
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global $dox_found;
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global $dox_miss;
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if (isset ($api[$canonical_declaration])) {
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$dox_found++;
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return $api[$canonical_declaration]['doc'];
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}
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elseif (isset ($api['ARDOUR::'.$canonical_declaration])) {
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$dox_found++;
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return $api['ARDOUR::'.$canonical_declaration]['doc'];
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}
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else {
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$dox_miss++;
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return '';
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}
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}
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################################################################################
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# OUTPUT
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################################################################################
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################################################################################
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# Helper functions
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define ('NL', "\n");
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function ctorname ($name) {
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return htmlentities (str_replace (':', '.', $name));
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}
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function shortname ($name) {
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return htmlentities (substr ($name, strrpos ($name, ':') + 1));
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}
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function varname ($a) {
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return array_keys ($a)[0];
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}
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function name_sort_cb ($a, $b) {
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return strcmp ($a['name'], $b['name']);
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}
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|
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function traverse_parent ($ns, &$inherited) {
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global $classlist;
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$rv = '';
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if (isset ($classlist[$ns]['luaparent'])) {
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$parents = array_unique ($classlist[$ns]['luaparent']);
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asort ($parents);
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foreach ($parents as $p) {
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if (!empty ($rv)) { $rv .= ', '; }
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$rv .= typelink ($p);
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$inherited[$p] = $classlist[$p];
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traverse_parent ($p, $inherited);
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}
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}
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return $rv;
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}
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function typelink ($a, $short = false, $argcls = '', $linkcls = '', $suffix = '') {
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global $classlist;
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global $constlist;
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# all cross-reference links are generated here.
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|
# currently anchors on a single page.
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|
if (isset($classlist[$a]['free'])) {
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return '<a class="'.$linkcls.'" href="#'.htmlentities ($a).'">'.($short ? shortname($a) : ctorname($a)).$suffix.'</a>';
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} else if (in_array ($a, array_keys ($classlist))) {
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return '<a class="'.$linkcls.'" href="#'.htmlentities($a).'">'.($short ? shortname($a) : htmlentities($a)).$suffix.'</a>';
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} else if (in_array ($a, array_keys ($constlist))) {
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return '<a class="'.$linkcls.'" href="#'.ctorname ($a).'">'.($short ? shortname($a) : ctorname($a)).$suffix.'</a>';
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} else {
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return '<span class="'.$argcls.'">'.htmlentities($a).$suffix.'</span>';
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}
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}
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|
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function format_args ($args) {
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$rv = '<span class="functionargs"> (';
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$first = true;
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foreach ($args as $a) {
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if (!$first) { $rv .= ', '; }; $first = false;
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$flags = $a[varname ($a)];
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if ($flags & 2) {
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$rv .= '<em>LuaTable</em> {'.typelink (varname ($a), true, 'em').'}';
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}
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elseif ($flags & 1) {
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$rv .= typelink (varname ($a), true, 'em', '', '&');
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}
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else {
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$rv .= typelink (varname ($a), true, 'em');
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}
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}
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$rv .= ')</span>';
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return $rv;
|
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}
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|
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function format_doxyclass ($cl) {
|
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$rv = '';
|
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if (isset ($cl['decl'])) {
|
|
$doc = doxydoc ($cl['decl']);
|
|
if (!empty ($doc)) {
|
|
$rv.= '<div class="classdox">'.$doc.'</div>'.NL;
|
|
}
|
|
}
|
|
return $rv;
|
|
}
|
|
|
|
function format_doxydoc ($f) {
|
|
$rv = '';
|
|
if (isset ($f['cand'])) {
|
|
$doc = doxydoc ($f['cand']);
|
|
if (!empty ($doc)) {
|
|
$rv.= '<tr><td></td><td class="doc" colspan="2"><div class="dox">'.$doc;
|
|
$rv.= '</div></td></tr>'.NL;
|
|
} else if (0) { # debug
|
|
$rv.= '<tr><td></td><td class="doc" colspan="2"><p>'.htmlentities($f['cand']).'</p>';
|
|
$rv.= '</td></tr>'.NL;
|
|
}
|
|
}
|
|
return $rv;
|
|
}
|
|
function format_class_members ($ns, $cl, &$dups) {
|
|
$rv = '';
|
|
if (isset ($cl['ctor'])) {
|
|
usort ($cl['ctor'], 'name_sort_cb');
|
|
$rv.= ' <tr><th colspan="3">Constructor</th></tr>'.NL;
|
|
foreach ($cl['ctor'] as $f) {
|
|
$rv.= ' <tr><td class="def">ℂ</td><td class="decl">';
|
|
$rv.= '<span class="functionname">'.ctorname ($f['name']).'</span>';
|
|
$rv.= format_args ($f['args']);
|
|
$rv.= '</td><td class="fill"></td></tr>'.NL;
|
|
$rv.= format_doxydoc($f);
|
|
}
|
|
}
|
|
$nondups = array ();
|
|
if (isset ($cl['func'])) {
|
|
foreach ($cl['func'] as $f) {
|
|
if (in_array (stripclass ($ns, $f['name']), $dups)) { continue; }
|
|
$nondups[] = $f;
|
|
}
|
|
}
|
|
if (count ($nondups) > 0) {
|
|
usort ($nondups, 'name_sort_cb');
|
|
$rv.= ' <tr><th colspan="3">Methods</th></tr>'.NL;
|
|
foreach ($nondups as $f) {
|
|
$dups[] = stripclass ($ns, $f['name']);
|
|
$rv.= ' <tr><td class="def">';
|
|
if ($f['ref'] && isset ($f['ext'])) {
|
|
# external C functions
|
|
$rv.= '<em>'.varname ($f['ret']).'</em>';
|
|
} elseif ($f['ref'] && varname ($f['ret']) == 'void') {
|
|
# functions with reference args return args
|
|
$rv.= '<em>LuaTable</em>(...)';
|
|
} elseif ($f['ref']) {
|
|
$rv.= '<em>LuaTable</em>('.typelink (varname ($f['ret']), true, 'em').', ...)';
|
|
} else {
|
|
$rv.= typelink (varname ($f['ret']), true, 'em');
|
|
}
|
|
$rv.= '</td><td class="decl">';
|
|
$rv.= '<span class="functionname"><abbr title="'.htmlentities($f['bind']['decl']).'">'.stripclass ($ns, $f['name']).'</abbr></span>';
|
|
$rv.= format_args ($f['args']);
|
|
$rv.= '</td><td class="fill"></td></tr>'.NL;
|
|
$rv.= format_doxydoc($f);
|
|
}
|
|
}
|
|
if (isset ($cl['data'])) {
|
|
usort ($cl['data'], 'name_sort_cb');
|
|
$rv.= ' <tr><th colspan="3">Data Members</th></tr>'.NL;
|
|
foreach ($cl['data'] as $f) {
|
|
$rv.= ' <tr><td class="def">'.typelink (array_keys ($f['ret'])[0], false, 'em').'</td><td class="decl">';
|
|
$rv.= '<span class="functionname">'.stripclass ($ns, $f['name']).'</span>';
|
|
$rv.= '</td><td class="fill"></td></tr>'.NL;
|
|
}
|
|
}
|
|
return $rv;
|
|
}
|
|
|
|
|
|
################################################################################
|
|
# Start Output
|
|
|
|
?><!DOCTYPE html>
|
|
<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en">
|
|
<head>
|
|
<title>Ardour Lua Bindings</title>
|
|
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
|
|
<style type="text/css">
|
|
div.content { max-width:60em; margin: 1em auto; }
|
|
h1 { margin:2em 0 0 0; padding:0em; border-bottom: 1px solid black;}
|
|
h2.cls { margin:2em 0 0 0; padding-left:1em; border: 1px dashed #6666ee;}
|
|
h2.cls abbr { text-decoration:none; cursor:default;}
|
|
h3.cls { margin:1em 0 0 0;}
|
|
h2.class { background-color: #aaee66; }
|
|
h2.enum { background-color: #aaaaaa; }
|
|
h2.pointerclass { background-color: #eeaa66; }
|
|
h2.array { background-color: #66aaee; }
|
|
h2.opaque { background-color: #6666aa; }
|
|
p { text-align: justify; }
|
|
p.cdecl { text-align: right; float:right; font-size:90%; margin:0; padding: 0 0 0 1em;}
|
|
ul.classindex { columns: 2; -webkit-columns: 2; -moz-columns: 2; }
|
|
div.clear { clear:both; }
|
|
p.classinfo { margin: .25em 0;}
|
|
div.code { width:80%; margin:.5em auto; }
|
|
div.code div { width:45%; }
|
|
div.code pre { line-height: 1.2em; margin: .25em 0; }
|
|
div.code samp { color: green; font-weight: bold; background-color: #eee; }
|
|
div.classdox { padding: .1em 1em;}
|
|
div.classdox p { margin: .5em 0 .5em .6em;}
|
|
div.classdox p { margin: .5em 0 .5em .6em;}
|
|
div.classdox { padding: .1em 1em;}
|
|
div.classdox p { margin: .5em 0 .5em .6em;}
|
|
table.classmembers { width: 100%; }
|
|
table.classmembers th { text-align:left; border-bottom:1px solid black; padding-top:1em; }
|
|
table.classmembers td.def { text-align:right; padding-right:.5em; white-space: nowrap;}
|
|
table.classmembers td.decl { text-align:left; padding-left:.5em; white-space: nowrap; }
|
|
table.classmembers td.doc { text-align:left; padding-left:.6em; line-height: 1.2em; font-size:80%;}
|
|
table.classmembers td.doc div.dox {background-color:#eee; padding: .1em 1em;}
|
|
table.classmembers td.doc p { margin: .5em 0; }
|
|
table.classmembers td.doc p.para-brief { font-size:120%; }
|
|
table.classmembers td.doc p.para-returns { font-size:120%; }
|
|
table.classmembers td.doc dl { font-size:120%; line-height: 1.3em; }
|
|
table.classmembers td.doc dt { font-style: italic; }
|
|
table.classmembers td.fill { width: 99%;}
|
|
table.classmembers span.em { font-style: italic;}
|
|
span.functionname abbr { text-decoration:none; cursor:default;}
|
|
div.header {text-align:center;}
|
|
div.header h1 {margin:0;}
|
|
div.header p {margin:.25em; text-align:center;}
|
|
</style>
|
|
</head>
|
|
<body>
|
|
<div class="header">
|
|
<h1>Ardour Lua Bindings</h1>
|
|
<p>
|
|
<a href="#h_classes">Class Documentation</a>
|
|
|
|
|
<a href="#h_enum">Enum/Constants</a>
|
|
|
|
|
<a href="#h_index">Index</a>
|
|
</p>
|
|
</div>
|
|
<div class="content">
|
|
|
|
<h1 id="h_intro">Overview</h1>
|
|
<p>
|
|
The top-level entry point are <?=typelink('ARDOUR:Session')?> and <?=typelink('ArdourUI:Editor')?>.
|
|
Most other Classes are used indirectly starting with a Session function. e.g. Session:get_routes().
|
|
</p>
|
|
<p>
|
|
A few classes are dedicated to certain script types, e.g. Lua DSP processors have exclusive access to
|
|
<?=typelink('ARDOUR:DSP')?> and <?=typelink('ARDOUR:ChanMapping')?>. Action Hooks Scripts to
|
|
<?=typelink('LuaSignal:Set')?> etc.
|
|
</p>
|
|
<p>
|
|
Detailed documentation (parameter names, method description) is not yet available. Please stay tuned.
|
|
</p>
|
|
<h2>Short introduction to Ardour classes</h2>
|
|
<p>
|
|
Ardour's structure is object oriented. The main object is the Session. A Session contains Audio Tracks, Midi Tracks and Busses.
|
|
Audio and Midi tracks are derived from a more general "Track" Object, which in turn is derived from a "Route" (aka Bus).
|
|
(We say "An Audio Track <em>is-a</em> Track <em>is-a</em> Route").
|
|
Tracks contain specifics. For Example a track <em>has-a</em> diskstream (for file i/o).
|
|
</p>
|
|
<p>
|
|
Operations are performed on objects. One gets a reference to an object and then calls a method.
|
|
e.g <code>obj = Session:route_by_name("Audio") obj:set_name("Guitar")</code>.
|
|
</p>
|
|
<p>
|
|
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:
|
|
you cannot simply remove a track that is currently processing audio. There are various <em>factory</em> methods for object creation or removal.
|
|
</p>
|
|
<h2>Pass by Reference</h2>
|
|
<p>
|
|
Since lua functions are closures, C++ methods that pass arguments by reference cannot be used as-is.
|
|
All parameters passed to a C++ method which uses references are returned as Lua Table.
|
|
If the C++ method also returns a value it is prefixed. Two parameters are returned: the value and a Lua Table holding the parameters.
|
|
</p>
|
|
|
|
<div class="code">
|
|
<div style="float:left;">C++
|
|
|
|
<pre><code class="cxx">void set_ref (int& var, long& val)
|
|
{
|
|
printf ("%d %ld\n", var, val);
|
|
var = 5;
|
|
val = 7;
|
|
}
|
|
</code></pre>
|
|
|
|
</div>
|
|
<div style="float:right;">Lua
|
|
|
|
<pre><code class="lua">local var = 0;
|
|
ref = set_ref (var, 2);
|
|
-- output from C++ printf()
|
|
</code><samp class="lua">0 2</samp><code>
|
|
-- var is still 0 here
|
|
print (ref[1], ref[2])
|
|
</code><samp class="lua">5 7</samp></pre>
|
|
|
|
</div>
|
|
</div>
|
|
<div class="clear"></div>
|
|
<div class="code">
|
|
<div style="float:left;">
|
|
|
|
<pre><code class="cxx">int set_ref2 (int &var, std::string unused)
|
|
{
|
|
var = 5;
|
|
return 3;
|
|
}
|
|
</code></pre>
|
|
|
|
</div>
|
|
<div style="float:right;">
|
|
<pre><code class="lua">rv, ref = set_ref2 (0, "hello");
|
|
print (rv, ref[1], ref[2])
|
|
</code><samp class="lua">3 5 hello</samp></pre>
|
|
</div>
|
|
</div>
|
|
<div class="clear"></div>
|
|
|
|
<h2>Pointer Classes</h2>
|
|
<p>
|
|
Libardour makes extensive use of reference counted <code>boost::shared_ptr</code> to manage lifetimes.
|
|
The Lua bindings provide a complete abstration of this. There are no pointers in lua.
|
|
For example a <?=typelink('ARDOUR:Route')?> is a pointer in C++, but lua functions operate on it like it was a class instance.
|
|
</p>
|
|
<p>
|
|
<code>shared_ptr</code> are reference counted. Once assigned to a lua variable, the C++ object will be kept and remains valid.
|
|
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.
|
|
</p>
|
|
<p>
|
|
All pointer classes have a <code>isnil ()</code> method. This is for two cases:
|
|
Construction may fail. e.g. <code><?=typelink('ARDOUR:LuaAPI')?>.newplugin()</code>
|
|
may not be able to find the given plugin and hence cannot create an object.
|
|
</p>
|
|
<p>
|
|
The second case if for <code>boost::weak_ptr</code>. As opposed to <code>boost::shared_ptr</code> weak-pointers are not reference counted.
|
|
The object may vanish at any time.
|
|
If lua code calls a method on a nil object, the interpreter will raise an exception and the script will not continue.
|
|
This is not unlike <code>a = nil a:test()</code> which results in en error "<em>attempt to index a nil value</em>".
|
|
</p>
|
|
<p>
|
|
From the lua side of things there is no distinction between weak and shared pointers. They behave identically.
|
|
Below they're inidicated in orange and have an arrow to indicate the pointer type.
|
|
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.
|
|
</p>
|
|
|
|
|
|
<?php
|
|
echo '<h1 id="h_classes">Class Documentation</h1>'.NL;
|
|
|
|
foreach ($classlist as $ns => $cl) {
|
|
$dups = array ();
|
|
$tbl = format_class_members ($ns, $cl, $dups);
|
|
|
|
# format class title
|
|
if (empty ($tbl)) {
|
|
echo '<h2 id="'.htmlentities ($ns).'" class="cls opaque"><abbr title="Opaque Object">∅</abbr> '.htmlentities ($ns).'</h2>'.NL;
|
|
}
|
|
else if (isset ($classlist[$ns]['free'])) {
|
|
echo '<h2 id="'.htmlentities ($ns).'" class="cls freeclass"><abbr title="Namespace">ℕ</abbr> '.ctorname($ns).'</h2>'.NL;
|
|
}
|
|
else if (isset ($classlist[$ns]['arr'])) {
|
|
echo '<h2 id="'.htmlentities ($ns).'" class="cls array"><abbr title="C Array">⋯</abbr> '.htmlentities ($ns).'</h2>'.NL;
|
|
}
|
|
else if (isset ($classlist[$ns]['ptr'])) {
|
|
echo '<h2 id="'.htmlentities ($ns).'" class="cls pointerclass"><abbr title="Pointer Class">↠</abbr> '. htmlentities ($ns).'</h2>'.NL;
|
|
} else {
|
|
echo '<h2 id="'.htmlentities ($ns).'" class="cls class"><abbr title="Class">∁</abbr> '.htmlentities ($ns).'</h2>'.NL;
|
|
}
|
|
if (isset ($cl['decl'])) {
|
|
echo '<p class="cdecl"><em>C‡</em>: '.htmlentities ($cl['decl']).'</p>'.NL;
|
|
}
|
|
|
|
# print class inheritance
|
|
$inherited = array ();
|
|
$isa = traverse_parent ($ns, $inherited);
|
|
if (!empty ($isa)) {
|
|
echo ' <p class="classinfo">is-a: '.$isa.'</p>'.NL;
|
|
}
|
|
echo '<div class="clear"></div>'.NL;
|
|
|
|
echo format_doxyclass ($cl);
|
|
|
|
# member documentation
|
|
if (empty ($tbl)) {
|
|
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;
|
|
} else {
|
|
echo '<table class="classmembers">'.NL;
|
|
echo $tbl;
|
|
echo ' </table>'.NL;
|
|
}
|
|
|
|
# traverse parent classes (inherited members)
|
|
foreach ($inherited as $pns => $pcl) {
|
|
$tbl = format_class_members ($pns, $pcl, $dups);
|
|
if (!empty ($tbl)) {
|
|
echo '<h3 class="cls">Inherited from '.$pns.'</h3>'.NL;
|
|
echo '<table class="classmembers">'.NL;
|
|
echo $tbl;
|
|
echo '</table>'.NL;
|
|
}
|
|
}
|
|
}
|
|
|
|
echo '<h1 id="h_enum">Enum/Constants</h1>'.NL;
|
|
foreach ($constlist as $ns => $cs) {
|
|
echo '<h2 id="'.ctorname ($ns).'" class="cls enum"><abbr title="Enum">∈</abbr> '.ctorname ($ns).'</h2>'.NL;
|
|
echo '<ul class="enum">'.NL;
|
|
foreach ($cs as $c) {
|
|
echo '<li class="const">'.ctorname ($c['lua']).'</li>'.NL;
|
|
}
|
|
echo '</ul>'.NL;
|
|
}
|
|
|
|
echo '<h1 id="h_index" >Class Index</h1>'.NL;
|
|
echo '<ul class="classindex">'.NL;
|
|
foreach ($classlist as $ns => $cl) {
|
|
echo '<li>'.typelink($ns).'</li>'.NL;
|
|
}
|
|
echo '</ul>'.NL;
|
|
|
|
fwrite (STDERR, "Found $dox_found annotations. missing: $dox_miss\n");
|
|
?>
|
|
</div>
|
|
</body>
|
|
</html>
|