{"id":264,"date":"2009-04-24T11:15:45","date_gmt":"2009-04-24T18:15:45","guid":{"rendered":"https:\/\/actionsnippet.com\/?p=1221"},"modified":"2009-04-24T11:15:45","modified_gmt":"2009-04-24T18:15:45","slug":"object-parsing-object-from-string-2","status":"publish","type":"post","link":"https:\/\/actionsnippet.com\/?p=264","title":{"rendered":"Object Parsing (object from string #2)"},"content":{"rendered":"
\r\nvar str:String = '{numA:100, numB:100, stringA:"hi there", object:{red:155, green:155, blue: 255}, array1D:[1, 2, 3, 4, 5, "six"], array2D:[[1,0,0], [0,1,0], [0,0,"z"]], color:0xFF0000}'\r\n\r\nvar obj:Object = toObject(str);\/\/, true); \/\/ comment the "true" in for some debug info\r\n\r\n\/\/ acess every value in the object for testing purposes\r\ntrace(obj.numA);\r\ntrace(obj.numB);\r\ntrace(obj.stringA);\r\ntrace(obj.object.red, obj.object.green, obj.object.blue);\r\ntrace(obj.array1D +" testing access: " + obj.array1D[3]);\r\ntrace(obj.array2D + " testing access: " + obj.array2D[1] + "  -  " + obj.array2D[2][2]);\r\ntrace(obj.color);\r\n\r\n\/*outputs:\r\n100\r\n100\r\nhi there\r\n155 155 255\r\n1,2,3,4,5,six testing access: 4\r\n1,0,0,0,1,0,0,0,z testing access: 0,1,0  -  z\r\n16711680\r\n*\/\r\n \r\nfunction toObject(str:String, debug:Boolean=false):Object{\r\n\tvar cmds:Array = new Array();\r\n\tvar stack:String = "";\r\n\t\/\/ skip first {\r\n\tstr = str.replace(\/^s+{|^{\/, "");\r\n\tvar obj:Object = new Object();\r\n\tfor (var i:int = 0; i<str.length; i++){\r\n\t\tvar char:String = str.charAt(i);\r\n\t\tif (char == ":"){\r\n\t\t\tcmds.push(["name:", stack])\r\n\t\t\tstack = "";\r\n\t\t\tchar = "";\r\n\t\t}else\r\n\t\tif (char == "," || char == "}"){\r\n\t\t\tif (stack != ""){\r\n\t\t\t  cmds.push(["value:", stack]);\r\n\t\t\t}\r\n\t\t\tstack = "";\r\n\t\t\tchar = "";\r\n\t\t}else\r\n\t\tif (char == '"'){\r\n\t\t\tstack = '"';\r\n\t\t\tfor (j = i + 1; j <str.length; j++){\r\n\t\t\t\tchar = str.charAt(j);\r\n\t\t\t\tstack+=char;\r\n\t\t\t\ti++;\r\n\t\t\t\tif (char == '"'){\r\n\t\t\t\t\t break;\r\n\t\t\t\t}\r\n\t\t\t}\r\n\t\t\tcmds.push(["value:", stack]);\r\n\t\t\tstack = "";\r\n\t\t\tchar = "";\r\n\t\t}else\r\n\t\tif (char == "{"){\r\n\t\t\tcmds.push(["object:", stack]);\r\n\t\t\tfor (var j:int = i; j <str.length; j++){\r\n\t\t\t\tchar = str.charAt(j);\r\n\t\t\t\tstack+=char;\r\n\t\t\t\ti++;\r\n\t\t\t\tif (char == "}"){\r\n\t\t\t\t\t break;\r\n\t\t\t\t}\r\n\t\t\t}\r\n\t\t\tcmds.push(["value:", stack]);\r\n\t\t\tstack = "";\r\n\t\t\tchar = "";\r\n\t\t}else\r\n\t\tif (char == "["){\r\n\t\t\tcmds.push(["array:", stack]);\r\n\t\t\tstack = "";\r\n\t\t\tchar = "";\r\n\t\t}else if (char == "]"){\r\n\t\t\tif (stack != ""){\r\n\t\t\t\tcmds.push(["value:", stack]);\r\n\t\t\t}\r\n\t\t\tstack = "";\r\n\t\t\tchar = "";\r\n\t\t\ti++;\r\n\t\t}\r\n\t\tstack += char;\r\n\t}\r\n\t\/\/ show some debug info\r\n\tif (debug){\r\n\t\tfor (i = 0; i<cmds.length; i++) trace(cmds[i]);\r\n\t}\r\n\t\/\/ build the object\r\n\tvar prop:String;\r\n\tvar arrayMode:Boolean = false;\r\n\tvar nest:int = 0;\r\n\tfor (i = 0; i<cmds.length; i++){\r\n\t\tif (cmds[i][0] == "name:"){\r\n\t\t\tprop = cmds[i][1].replace(\/s\/g, "");\r\n\t\t\tarrayMode = false;\r\n\t\t\tnest = 0;\r\n\t\t}else if (cmds[i][0] == "value:"){\r\n\t\t\tif (arrayMode == false){\r\n\t\t\t  obj[prop] = valueType(cmds[i][1]);\r\n\t\t\t}else{\r\n\t\t\t\t\/\/ populate array\r\n\t\t\t\tif (nest == 1){\r\n\t\t\t\t  obj[prop].push(valueType(cmds[i][1]))\r\n\t\t\t\t}else{\r\n\t\t\t\t  obj[prop][nest - 2].push(valueType(cmds[i][1]))\r\n\t\t\t\t}\r\n\t\t\t}\r\n\t\t}else if (cmds[i][0] == "object:"){\r\n\t\t\ti++;\r\n\t\t\tobj[prop] = toObject(cmds[i][1], debug);\r\n\t\t}else if (cmds[i][0] == "array:"){\r\n\t\t\tarrayMode = true;\r\n\t\t\tnest++;\r\n\t\t\tif (nest == 1){\r\n\t\t\t\t\/\/ create array\r\n\t\t\t\tobj[prop] = new Array()\r\n\t\t\t}else{\r\n\t\t\t\t\/\/ nested array\r\n\t\t\t\tobj[prop].push(new Array());\r\n\t\t\t}\r\n\t\t}\r\n\t}\r\n\treturn obj;\r\n}\r\n \r\nfunction valueType(val:*):* {\r\n\tif (isNaN(Number(val))) {\r\n\t\t   \/\/ remove leading and trailing white\r\n\t\t   \/\/ remove "" around strings\r\n\t\t   val = val.replace(\/^s+|s+$\/g,"").replace(\/^"|"$\/g,"");\r\n\t\t   \/\/  see if it's a boolean\r\n\t\t   if (val == "true"){\r\n\t\t\t   val = true;\r\n\t\t   }else if (val == "false"){\r\n\t\t\t   val = false\r\n\t\t   }\r\n\t} else {\r\n\t\tval = Number(val);\r\n\t}\r\n\treturn val;\r\n}\r\n<\/pre>\n
This rather large code snippet parses ActionScript style Object syntax. While this is by no means a complete parser – it was easy to write and saved me a great deal of time on a project recently….<\/p>\n
I specifically needed support for 1D and 2D arrays as Object properties. If that weren’t the case I would have used something simple like yesterdays method. The array support won’t work with anything higher than a 2D array (for now… may fix that soon). For fun I also added nested Object support – this doesn’t have any dimensional limitation so you can nest as many objects as you want. For instance.. this works just fine:<\/p>\n
\r\nvar gameUser:Object = toObject('{name:"Mr.S", alive:true, stats:{lives:100, points:1200, data:[100,12,40,12,90], plant:{branch:{leaves:["red, "green", "blue"]}}}');\r\n\r\ntrace(gameUser.stats.plant.branch.leaves[0]);\r\ntrace(gameUser.stats.lives);\r\n\/\/ boolean support\r\ntrace("not true is false: ", !gameUser.alive);\r\n\/*outputs:\r\nred\r\n100\r\nnot true is false:  false\r\n*\/\r\n<\/pre>\n
You’ll also notice the added boolean support in the above example. Which was suggested by katopz in the comments of yesterdays post.<\/p>\n
Definitely need to add a word of warning here… I wouldn’t be surprised if there were a bug or two lurking in this code. The Objects I’ve been parsing with it are all quite similar… so use at your own risk.<\/em><\/p>\n
UPDATEs – Known Issues:
\n1) fixed a bug where if a String property contains a ,{}[] or : character the parser failed.<\/p>\n","protected":false},"excerpt":{"rendered":"
var str:String = '{numA:100, numB:100, stringA:"hi there", object:{red:155, green:155, blue: 255}, array1D:[1, 2, 3, 4, 5, "six"], array2D:[[1,0,0], [0,1,0], [0,0,"z"]], color:0xFF0000}' var obj:Object = toObject(str);\/\/, true); \/\/ comment the "true" in for some debug info \/\/ acess every value in the object for testing purposes trace(obj.numA); trace(obj.numB); trace(obj.stringA); trace(obj.object.red, obj.object.green, obj.object.blue); trace(obj.array1D +" testing access: […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[9,20,21],"tags":[3,4],"class_list":["post-264","post","type-post","status-publish","format-standard","hentry","category-dynamic","category-string-manipulation","category-strings","tag-actionscript","tag-flash"],"_links":{"self":[{"href":"https:\/\/actionsnippet.com\/index.php?rest_route=\/wp\/v2\/posts\/264","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/actionsnippet.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/actionsnippet.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/actionsnippet.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/actionsnippet.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=264"}],"version-history":[{"count":0,"href":"https:\/\/actionsnippet.com\/index.php?rest_route=\/wp\/v2\/posts\/264\/revisions"}],"wp:attachment":[{"href":"https:\/\/actionsnippet.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=264"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/actionsnippet.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=264"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/actionsnippet.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=264"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}