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Inspecting the Simulator...

21 replies [Last post]
Posted on Tue, 2010-01-05 03:00
Rozek
User offline. Last seen 1 year 18 weeks ago. Offline
Test Driver
Joined: 25 Dec 2009

Hello!

A "work-in-progress" often leaves its documentation behind - Corona is certainly no exception from this rule...

Fortunately, however, Lua offers really useful introspection capabilities, which may also be used to inspect the Corona run-time environment.

The author has tried to inspect the "Corona-Terminal", here are the results.

The code used was the following (unfortunately, the forum does no longer display any indentations - is there a special trick?) :

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  io.stdout:setvbuf("no");
  io.stderr:setvbuf("no");
 
--------------------------------------------------------------------------------
-- inform[ln]                          writes the given arguments onto stdout --
--------------------------------------------------------------------------------
 
  function inform (...)
    for i = 1,select('#',...) do               -- even "nil" is handled properly
      io.stdout:write(tostring(select(i,...)));
    end;
  end;
 
  function informln (...)
    for i = 1,select('#',...) do               -- even "nil" is handled properly
      io.stdout:write(tostring(select(i,...)));
    end;
    io.stdout:write("\n");
  end;
 
--------------------------------------------------------------------------------
-- say[ln]                                       just synonyms for inform[ln] --
--------------------------------------------------------------------------------
 
  say   = inform;
  sayln = informln;
 
 
  local Label = display.newText("(see Terminal)", 60,50, nil, 28);
  Label:setTextColor(255,255,255);
 
--------------------------------------------------------------------------------
--               Table Tracking (never inspect any table twice)               --
--------------------------------------------------------------------------------
 
  local inspectedTables = {};
  local pendingTables   = {};
 
--------------------------------------------------------------------------------
-- inspectTable                                        inspects a given table --
--------------------------------------------------------------------------------
 
function inspectTable (TablePrefix, Table)
  inspectedTables[Table] = TablePrefix;          -- mark this table as inspected
 
---- construct a sorted list with the keys of this table ----
 
  local KeyTable = {}; local hasNonPrintableKeys = false;
    for Key,Value in pairs(Table) do
      if     (type(Key) == "string") then
        KeyTable[#KeyTable+1] = Key;
      elseif (type(Key) == "number") then
        KeyTable[#KeyTable+1] = tostring(Key);  -- not really fool-proof, I know
      else
        hasNonPrintableKeys = true;      -- just remember any non-printable keys
      end;
    end;
  table.sort(KeyTable);
 
---- determine the length of the longest key ----
 
  local maxKeyLength = 0;
  for i = 1,#KeyTable do
    if (#KeyTable[i] > maxKeyLength) then
      maxKeyLength = #KeyTable[i]
    end;
  end;
 
---- finally print the list of global keys ----
 
  sayln();
  sayln(string.rep("-",80));
  sayln(" Contents of ",TablePrefix);
  sayln(string.rep("-",80));
  sayln();
 
  if (#KeyTable == 0) then
    if (hasNonPrintableKeys) then
      sayln(" (this table seems to contain non-printable keys only)");
    else
      sayln(" (this table is empty)");
    end;
  end;
 
  for i = 1,#KeyTable do
    local currentKey = KeyTable[i];                           -- just a shortcut
    say(" ", string.rep(" ",maxKeyLength-#currentKey), currentKey, ": ");
 
    local currentType = type(Table[currentKey]);
    if     (currentType == "nil") then
      sayln("nil");
    elseif (currentType == "boolean") then
      sayln(Table[currentKey]);
    elseif (currentType == "number") then
      sayln(Table[currentKey]);
    elseif (currentType == "string") then
      sayln("'",Table[currentKey],"'");
    elseif (currentType == "table") then
      if (inspectedTables[Table[currentKey]] == nil) then
        sayln("(table, will be inspected later)");
        pendingTables[#pendingTables+1] = {
          Prefix = TablePrefix.."['"..currentKey.."']",
          Value  = Table[currentKey]
        };
      else
        sayln("(table, same as "..inspectedTables[Table[currentKey]]..")");
      end;
    else
      sayln("(",currentType,")");
    end;
  end;
 
  if (hasNonPrintableKeys) then
    sayln();
    sayln("this table also seems to contain non-printable keys!")
  end;
end;
 
--------------------------------------------------------------------------------
--                Inspection of the Corona Runtime Environment                --
--------------------------------------------------------------------------------
 
  sayln("Lua Version: ", _VERSION);
 
  inspectTable("_G",_G);
  while (#pendingTables > 0) do
    local nextTable = table.remove(pendingTables,1);
    inspectTable(nextTable.Prefix,nextTable.Value);
  end;

Top

Replies

Posted on Tue, 2010-01-05 03:13
#1
Rozek
User offline. Last seen 1 year 18 weeks ago. Offline
Test Driver
Joined: 25 Dec 2009

Inspection of the global table "_G" yields:

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Lua Version: Lua 5.1
 
--------------------------------------------------------------------------------
 Contents of _G
--------------------------------------------------------------------------------
 
   BounceBehavior: (table, will be inspected later)
   ButtonBehavior: (table, will be inspected later)
        Generator: (table, will be inspected later)
 Rotate3DBehavior: (table, will be inspected later)
          Runtime: (table, will be inspected later)
               _G: (table, same as _G)
         _VERSION: 'Lua 5.1'
           assert: (function)
   collectgarbage: (function)
         complain: (function)
       complainln: (function)
        coroutine: (table, will be inspected later)
              cry: (function)
            cryln: (function)
            debug: (table, will be inspected later)
          display: (table, will be inspected later)
           dofile: (function)
           easing: (table, will be inspected later)
            error: (function)
           gcinfo: (function)
          getfenv: (function)
     getmetatable: (function)
           inform: (function)
         informln: (function)
     inspectTable: (function)
               io: (table, will be inspected later)
           ipairs: (function)
             load: (function)
         loadfile: (function)
       loadstring: (function)
             math: (table, will be inspected later)
            media: (table, will be inspected later)
           module: (function)
           native: (table, will be inspected later)
         newproxy: (function)
             next: (function)
               os: (table, will be inspected later)
          package: (table, will be inspected later)
            pairs: (function)
            pcall: (function)
            print: (function)
         rawequal: (function)
           rawget: (function)
           rawset: (function)
          require: (function)
              say: (function)
            sayln: (function)
           select: (function)
          setfenv: (function)
     setmetatable: (function)
           string: (table, will be inspected later)
           system: (table, will be inspected later)
            table: (table, will be inspected later)
            timer: (table, will be inspected later)
         tonumber: (function)
         tostring: (function)
       transition: (table, will be inspected later)
             type: (function)
           unpack: (function)
           xpcall: (function)

Again, any indentations were lost - that's bad...

Well, at a first glance:

  • the common lua functions and tables seem to be present (mind the load... and dofile functions, which do not work on the actual device!)
  • any Corona-specific functions seem to be found in their own tables (which is definitely a good idea) we will inspect them later
  • there is an additional function "newproxy" (was that mentioned in the docs?)
Top
Posted on Tue, 2010-01-05 03:52
#2
Rozek
User offline. Last seen 1 year 18 weeks ago. Offline
Test Driver
Joined: 25 Dec 2009

The next tables sound interesting, but there is not yet any description in the docs:

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--------------------------------------------------------------------------------
 Contents of _G['BounceBehavior']
--------------------------------------------------------------------------------
 
          _name: 'Bounce'
    _numTargets: 0
        _target: (table, will be inspected later)
      container: (table, will be inspected later)
     enterFrame: (function)
    orientation: (function)
       register: (function)
  setAutoRotate: (function)
 setOrientation: (function)
             vx: 0
             vy: 0
 
--------------------------------------------------------------------------------
 Contents of _G['ButtonBehavior']
--------------------------------------------------------------------------------
 
 _eventName: 'touch'
      _name: 'Button'
   register: (function)
 
--------------------------------------------------------------------------------
 Contents of _G['Generator']
--------------------------------------------------------------------------------
 
 random: (function)
 
--------------------------------------------------------------------------------
 Contents of _G['Rotate3DBehavior']
--------------------------------------------------------------------------------
 
       _name: 'Rotate3D'
 _numTargets: 0
     _target: (table, will be inspected later)
  _vRotation: 0
  enterFrame: (function)
    register: (function)
       reset: (function)

Top
Posted on Tue, 2010-01-05 03:15
#3
Rozek
User offline. Last seen 1 year 18 weeks ago. Offline
Test Driver
Joined: 25 Dec 2009

The "Runtime" table contains functions for event listener management:

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--------------------------------------------------------------------------------
 Contents of _G['Runtime']
--------------------------------------------------------------------------------
 
              _proxy: (table, will be inspected later)
              _stage: (table, will be inspected later)
              _super: (table, will be inspected later)
    addEventListener: (function)
 removeEventListener: (function)

Top
Posted on Tue, 2010-01-05 03:54
#4
Rozek
User offline. Last seen 1 year 18 weeks ago. Offline
Test Driver
Joined: 25 Dec 2009

The "coroutine" and "debug" tables seem to be complete (they *look* so, at least):

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--------------------------------------------------------------------------------
 Contents of _G['coroutine']
--------------------------------------------------------------------------------
 
  create: (function)
  resume: (function)
 running: (function)
  status: (function)
    wrap: (function)
   yield: (function)
 
--------------------------------------------------------------------------------
 Contents of _G['debug']
--------------------------------------------------------------------------------
 
        debug: (function)
      getfenv: (function)
      gethook: (function)
      getinfo: (function)
     getlocal: (function)
 getmetatable: (function)
  getregistry: (function)
   getupvalue: (function)
      setfenv: (function)
      sethook: (function)
     setlocal: (function)
 setmetatable: (function)
   setupvalue: (function)
    traceback: (function)

Top
Posted on Tue, 2010-01-05 03:22
#5
Rozek
User offline. Last seen 1 year 18 weeks ago. Offline
Test Driver
Joined: 25 Dec 2009

Many of the "display" functions have already been described in the docs - but what about the "newLine" function? When looking through the API Reference, the author expected line/polyline/polygon support - but could not find it. By inspecting the "display" table, however, it looks as if there would be some line/polyline functionality, at least.

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--------------------------------------------------------------------------------
 Contents of _G['display']
--------------------------------------------------------------------------------
 
 BottomCenterReferencePoint: (userdata)
   BottomLeftReferencePoint: (userdata)
  BottomRightReferencePoint: (userdata)
   CenterLeftReferencePoint: (userdata)
       CenterReferencePoint: (userdata)
  CenterRightReferencePoint: (userdata)
              DarkStatusBar: (userdata)
           DefaultStatusBar: (userdata)
            HiddenStatusBar: (userdata)
    TopCenterReferencePoint: (userdata)
      TopLeftReferencePoint: (userdata)
     TopRightReferencePoint: (userdata)
       TranslucentStatusBar: (userdata)
           _getCurrentStage: (function)
                 _newCircle: (function)
              _newContainer: (function)
                  _newGroup: (function)
                  _newImage: (function)
                   _newLine: (function)
                   _newRect: (function)
            _newRoundedRect: (function)
                   _newText: (function)
              captureScreen: (function)
            getCurrentStage: (function)
                  newCircle: (function)
               newContainer: (function)
                   newGroup: (function)
                   newImage: (function)
                    newLine: (function)
                    newRect: (function)
             newRoundedRect: (function)
                    newText: (function)
                       save: (function)
               setStatusBar: (function)

Top
Posted on Tue, 2010-01-05 03:24
#6
Rozek
User offline. Last seen 1 year 18 weeks ago. Offline
Test Driver
Joined: 25 Dec 2009

The "easing" table was only partially mentioned in the docs (but not really "described"):

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--------------------------------------------------------------------------------
 Contents of _G['easing']
--------------------------------------------------------------------------------
 
    inBounce: (function)
      inExpo: (function)
 inOutBounce: (function)
   inOutExpo: (function)
   inOutQuad: (function)
      inQuad: (function)
      linear: (function)
   outBounce: (function)
     outExpo: (function)
     outQuad: (function)

Top
Posted on Tue, 2010-01-05 03:27
#7
Rozek
User offline. Last seen 1 year 18 weeks ago. Offline
Test Driver
Joined: 25 Dec 2009

"io" and "math" look complete:

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--------------------------------------------------------------------------------
 Contents of _G['io']
--------------------------------------------------------------------------------
 
   close: (function)
   flush: (function)
   input: (function)
   lines: (function)
    open: (function)
  output: (function)
   popen: (function)
    read: (function)
  stderr: (userdata)
   stdin: (userdata)
  stdout: (userdata)
 tmpfile: (function)
    type: (function)
   write: (function)
 
--------------------------------------------------------------------------------
 Contents of _G['math']
--------------------------------------------------------------------------------
 
        abs: (function)
       acos: (function)
       asin: (function)
       atan: (function)
      atan2: (function)
       ceil: (function)
        cos: (function)
       cosh: (function)
        deg: (function)
        exp: (function)
      floor: (function)
       fmod: (function)
      frexp: (function)
       huge: inf
      ldexp: (function)
        log: (function)
      log10: (function)
        max: (function)
        min: (function)
        mod: (function)
       modf: (function)
         pi: 3.1415926535898
        pow: (function)
        rad: (function)
     random: (function)
 randomseed: (function)
        sin: (function)
       sinh: (function)
       sqrt: (function)
        tan: (function)
       tanh: (function)

Top
Posted on Tue, 2010-01-05 03:30
#8
Rozek
User offline. Last seen 1 year 18 weeks ago. Offline
Test Driver
Joined: 25 Dec 2009

The "media" table has been extensively described in the docs:

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--------------------------------------------------------------------------------
 Contents of _G['media']
--------------------------------------------------------------------------------
 
           Camera: (userdata)
     PhotoLibrary: (userdata)
 SavedPhotosAlbum: (userdata)
    newEventSound: (function)
       pauseSound: (function)
   playEventSound: (function)
        playSound: (function)
        playVideo: (function)
             show: (function)
        stopSound: (function)

Top
Posted on Tue, 2010-01-05 03:55
#9
Rozek
User offline. Last seen 1 year 18 weeks ago. Offline
Test Driver
Joined: 25 Dec 2009

The "native" table has also been completely described in the docs. Unfortunately, there are no "hidden" functions for text input (which still seems to be missing!):

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--------------------------------------------------------------------------------
 Contents of _G['native']
--------------------------------------------------------------------------------
 
 cancelAlert: (function)
   showAlert: (function)

Top
Posted on Tue, 2010-01-05 03:34
#10
Rozek
User offline. Last seen 1 year 18 weeks ago. Offline
Test Driver
Joined: 25 Dec 2009

The "os" table looks complete, the same applies to the "package" table:

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--------------------------------------------------------------------------------
 Contents of _G['os']
--------------------------------------------------------------------------------
 
     clock: (function)
      date: (function)
  difftime: (function)
   execute: (function)
      exit: (function)
    getenv: (function)
    remove: (function)
    rename: (function)
 setlocale: (function)
      time: (function)
   tmpname: (function)
 
--------------------------------------------------------------------------------
 Contents of _G['package']
--------------------------------------------------------------------------------
 
  config: '/
;
?
!
-'
   cpath: '/Applications/Corona/Corona Simulator.app/Contents/Resources/?.blu'
  loaded: (table, will be inspected later)
 loaders: (table, will be inspected later)
 loadlib: (function)
    path: '/Users/rozek/Corona/?.lua;/Applications/Corona/Corona Simulator.app/Contents/Resources/?.lua'
 preload: (table, will be inspected later)
  seeall: (function)

Top
Posted on Tue, 2010-01-05 03:35
#11
Rozek
User offline. Last seen 1 year 18 weeks ago. Offline
Test Driver
Joined: 25 Dec 2009

"string" support looks complete as well:

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--------------------------------------------------------------------------------
 Contents of _G['string']
--------------------------------------------------------------------------------
 
    byte: (function)
    char: (function)
    dump: (function)
    find: (function)
  format: (function)
   gfind: (function)
  gmatch: (function)
    gsub: (function)
     len: (function)
   lower: (function)
   match: (function)
     rep: (function)
 reverse: (function)
     sub: (function)
   upper: (function)

Top
Posted on Tue, 2010-01-05 03:40
#12
Rozek
User offline. Last seen 1 year 18 weeks ago. Offline
Test Driver
Joined: 25 Dec 2009

The "system" table contains two public looking functions "beginListener" and "endListener" - they should either be documented or have names starting with an underscore "_" in order to mark them "private" (at least - of course, Lua offers far better approaches to "hide" private table entries):

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--------------------------------------------------------------------------------
 Contents of _G['system']
--------------------------------------------------------------------------------
 
       DocumentsDirectory: (userdata)
        ResourceDirectory: (userdata)
  SystemResourceDirectory: (userdata)
       TemporaryDirectory: (userdata)
             __proxyindex: (function)
          __proxynewindex: (function)
          __proxyregister: (function)
            beginListener: (function)
              endListener: (function)
                  getInfo: (function)
                 getTimer: (function)
                  openURL: (function)
              pathForFile: (function)
 setAccelerometerInterval: (function)
             setIdleTimer: (function)
                  vibrate: (function)

Top
Posted on Tue, 2010-01-05 03:42
#13
Rozek
User offline. Last seen 1 year 18 weeks ago. Offline
Test Driver
Joined: 25 Dec 2009

The "table" table seems to contain a few additional methods ("foreach", "foreachi" and "getn", "setn"):

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--------------------------------------------------------------------------------
 Contents of _G['table']
--------------------------------------------------------------------------------
 
   concat: (function)
  foreach: (function)
 foreachi: (function)
     getn: (function)
   insert: (function)
     maxn: (function)
   remove: (function)
     setn: (function)
     sort: (function)

Top
Posted on Tue, 2010-01-05 03:44
#14
Rozek
User offline. Last seen 1 year 18 weeks ago. Offline
Test Driver
Joined: 25 Dec 2009

The "timer" table seems to additionally offer a function "cancel" which sounds very promising!

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--------------------------------------------------------------------------------
 Contents of _G['timer']
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          _insert: (function)
         _runlist: (table, will be inspected later)
           cancel: (function)
       enterFrame: (function)
 performWithDelay: (function)

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Posted on Tue, 2010-01-05 03:46
#15
Rozek
User offline. Last seen 1 year 18 weeks ago. Offline
Test Driver
Joined: 25 Dec 2009

The "transition" table also seems to offer more functions than described:

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--------------------------------------------------------------------------------
 Contents of _G['transition']
--------------------------------------------------------------------------------
 
          _activeTweens: (table, will be inspected later)
                   _add: (function)
 _createSlideParameters: (function)
    _dissolvePrepareDst: (function)
    _dissolvePrepareSrc: (function)
             _initTween: (function)
       _nonPropertyKeys: (table, will be inspected later)
          _setInvisible: (function)
                 cancel: (function)
               dissolve: (function)
             enterFrame: (function)
                   from: (function)
                  slide: (function)
                     to: (function)

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Posted on Tue, 2010-01-05 03:47
#16
Rozek
User offline. Last seen 1 year 18 weeks ago. Offline
Test Driver
Joined: 25 Dec 2009

The following tables are only mentioned to be complete:

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--------------------------------------------------------------------------------
 Contents of _G['BounceBehavior']['_target']
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 (this table is empty)
 
--------------------------------------------------------------------------------
 Contents of _G['BounceBehavior']['container']
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 _class: (table, will be inspected later)
 _proxy: (userdata)
 
--------------------------------------------------------------------------------
 Contents of _G['Rotate3DBehavior']['_target']
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 (this table is empty)
 
--------------------------------------------------------------------------------
 Contents of _G['Runtime']['_proxy']
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    __index: (function)
 __newindex: (function)
 
--------------------------------------------------------------------------------
 Contents of _G['Runtime']['_stage']
--------------------------------------------------------------------------------
 
 _class: (table, will be inspected later)
 _proxy: (userdata)

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Posted on Tue, 2010-01-05 03:48
#17
Rozek
User offline. Last seen 1 year 18 weeks ago. Offline
Test Driver
Joined: 25 Dec 2009

The following table looks like the metatable of "Runtime":

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 Contents of _G['Runtime']['_super']
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             __index: (table, same as _G['Runtime']['_super'])
       _indexForType: (table, will be inspected later)
              _super: (table, will be inspected later)
    addEventListener: (function)
       dispatchEvent: (function)
    getOrCreateTable: (function)
 removeEventListener: (function)
     respondsToEvent: (function)

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Posted on Tue, 2010-01-05 03:49
#18
Rozek
User offline. Last seen 1 year 18 weeks ago. Offline
Test Driver
Joined: 25 Dec 2009

Here comes the list of loaded and "preloaded" packages:

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--------------------------------------------------------------------------------
 Contents of _G['package']['loaded']
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        _G: (table, same as _G)
 coroutine: (table, same as _G['coroutine'])
     debug: (table, same as _G['debug'])
   display: (table, same as _G['display'])
        io: (table, same as _G['io'])
      math: (table, same as _G['math'])
     media: (table, same as _G['media'])
    native: (table, same as _G['native'])
        os: (table, same as _G['os'])
   package: (table, same as _G['package'])
    string: (table, same as _G['string'])
    system: (table, same as _G['system'])
     table: (table, same as _G['table'])
 
--------------------------------------------------------------------------------
 Contents of _G['package']['loaders']
--------------------------------------------------------------------------------
 
 1: nil
 2: nil
 3: nil
 4: nil
 
--------------------------------------------------------------------------------
 Contents of _G['package']['preload']
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       ltn12: (function)
        mime: (function)
   mime.core: (function)
      socket: (function)
 socket.core: (function)
  socket.ftp: (function)
 socket.http: (function)
 socket.smtp: (function)
   socket.tp: (function)
  socket.url: (function)

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Posted on Tue, 2010-01-05 03:50
#19
Rozek
User offline. Last seen 1 year 18 weeks ago. Offline
Test Driver
Joined: 25 Dec 2009

The interpretation of the following tables is left to the user:

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--------------------------------------------------------------------------------
 Contents of _G['timer']['_runlist']
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 (this table is empty)
 
--------------------------------------------------------------------------------
 Contents of _G['transition']['_activeTweens']
--------------------------------------------------------------------------------
 
 (this table is empty)
 
--------------------------------------------------------------------------------
 Contents of _G['transition']['_nonPropertyKeys']
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      delay: true
      delta: true
 onComplete: true
    onStart: true
       time: true
 transition: true
 
--------------------------------------------------------------------------------
 Contents of _G['BounceBehavior']['container']['_class']
--------------------------------------------------------------------------------
 
        __index: (table, same as _G['BounceBehavior']['container']['_class'])
    addBehavior: (function)
    hasBehavior: (function)
      initProxy: (function)
 removeBehavior: (function)
 
--------------------------------------------------------------------------------
 Contents of _G['Runtime']['_stage']['_class']
--------------------------------------------------------------------------------
 
        __index: (table, same as _G['Runtime']['_stage']['_class'])
    addBehavior: (function)
    hasBehavior: (function)
      initProxy: (function)
 removeBehavior: (function)
 
--------------------------------------------------------------------------------
 Contents of _G['Runtime']['_super']['_indexForType']
--------------------------------------------------------------------------------
 
 function: '_functionListeners'
    table: '_tableListeners'
 
--------------------------------------------------------------------------------
 Contents of _G['Runtime']['_super']['_super']
--------------------------------------------------------------------------------
 
  __index: (table, same as _G['Runtime']['_super']['_super'])
      new: (function)
 newClass: (function)

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Posted on Tue, 2010-01-05 17:32
#20
Dotnaught's picture
Dotnaught
User offline. Last seen 3 days 5 hours ago. Offline
Pro Developer
Joined: 7 Jul 2009

Thanks for the research. Interesting.

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Posted on Fri, 2010-01-08 23:33
#21
Rozek
User offline. Last seen 1 year 18 weeks ago. Offline
Test Driver
Joined: 25 Dec 2009

Hello!

Now, that Corona 1.01 has been released, it's time to inspect the new environment and look out for changes.

At a first glance, the following changes were made:

_G: no more "Behavior"s, no "Generator"
_G['package']['preload']: there is a new "crypto" package

I did not find any other modifications - did I miss s.th.?

Kind regards,

Andreas Rozek

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