Created
January 2, 2011 18:10
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A JSON Parse Routine for Active4D with some limitations
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| <% | |
| /********************************************************************************** | |
| jsonParseSimple | |
| In => $json -> Text in JavaScript Object Notation(JSON) | |
| Out => The JSON text parsed to an Active4D collection with some limitations. | |
| Active4D cannot do everything that you can in JSON (JavaScript, Ruby, PHP etc). | |
| You cannot have an array of mixed types as you can in other languages. | |
| This was written for 4D 2004 so there is the 32K text limit on $json | |
| The JSON must be enclosed in an object {} or array [] notation | |
| It will probably do 100% of what you'd like it to do if you control boths sides (create and parse JSON). It will convert | |
| just about any sane JSON I've found at a web service. It will convert anything created with the a4d.json libary. | |
| Dates use the "Jan 2, 2011" format as does the a4d.json libary | |
| Objects are converted to collection with calls to execute "new collection" | |
| Arrays are restricted to text, longint, and real arrays. | |
| If a longint array is an array of collections, it will create those collections. | |
| This parse process is in five steps. | |
| A regex is used to convert dates | |
| The JSON is parsed by each character and certain characters (",:\n\r) are changed to high ASCII values or removed | |
| A regex replace is set up to change the JSON object notation to Active4D notation | |
| The high ASCII characters are returned to their original value | |
| The result is executed, which productes the collection. | |
| **********************************************************************************/ | |
| method "jsonParseSimple"($json) | |
| // First convert any dates in IETF format to 4d date | |
| $re1 := "~\"?(Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep|Oct|Nov|Dec)( \\d\\d*, \d{4})\"~" | |
| $rp1 := "newDate(\"\1\2\")" | |
| regex replace($re1; $json; $rp1; $json) | |
| $json := trim($json) | |
| if ($json[[1]] = "[") // if json is just an array, wrap in in an object | |
| $json := '{"array":$json}' | |
| end if | |
| //Next, hide commas, colons, apostrophe between quotes | |
| $inQuote := false | |
| for each ($json; $char; $index) | |
| case of | |
| :($char = '"') | |
| $inQuote := not($inQuote) | |
| :(($char = ",") & $inQuote) | |
| $json[[$index]] := char(254) | |
| :(($char = ":") & $inQuote) | |
| $json[[$index]] := char(253) | |
| :(($char = "'") & $inQuote) | |
| $json[[$index]] := char(252) | |
| :(($char = "\n") & not($inQuote)) | |
| $json[[$index]] := " " | |
| :(($char = "\r") & not($inQuote)) | |
| $json[[$index]] := " " | |
| :(($char = "\n") & ($inQuote)) | |
| $json[[$index]] := char(251) | |
| :(($char = "\r") & ($inQuote)) | |
| $json[[$index]] := char(251) | |
| end case | |
| end for each | |
| //Now convert objects | |
| array text($pattern;0) // regex pattern array | |
| array text($replace;0) // reqex replace array | |
| // set the reqex array - first the patterns to match | |
| $pattern{} := "|:\\s*{|" // object => convert :{ to ;new collection( | |
| $pattern{} := "|\\[\\]|" // replace empty array with empty text array -> a call to emptyArray | |
| $pattern{} := "|:\\s*\\[|" // text, real, or longint array -> a call to newArray(''' JSON ARRAY ''') | |
| $pattern{} := "|\\]|" // end array => convert ] to ) | |
| $pattern{} := "|}|" // end object => convert } to ) | |
| $pattern{} := "|[:,]|" // replace comma and colon with semi-colon | |
| $pattern{} := "|{|" // replace begining object with new collection() | |
| $pattern{} := "|new collection\\(\\)|" // replace empty collection convert new collection() with new collection | |
| //set the replacement array | |
| $replace{} := ";new collection(" // ojects that have a key | |
| $replace{} := "emptyArray" // [] | |
| $replace{} := ";newArray( ''' " // [..,..,..] | |
| $replace{} := " ''')" | |
| $replace{} := ")" | |
| $replace{} := ";" | |
| $replace{} := "new collection(" // collections without a key (an array of collections) | |
| $replace{} := "new collection" | |
| regex replace($pattern; $json; $replace; $results) // do the replacements | |
| //put commas, colon, apos back | |
| $results := replace string($results;char(254);",") | |
| $results := replace string($results;char(253);":") | |
| $results := replace string($results;char(252);"'") | |
| $results := replace string($results;char(251);"\\n") | |
| // crate the collection from the parsed $results - make Active4D work | |
| $collection := execute("return ("+ $results+ ")") | |
| //writebr('<textarea>$results</textarea>') | |
| //$collection := new collection | |
| return($collection) | |
| end method | |
| /********************************************************************************** | |
| emptyArray | |
| The response to finding and empty array [] in a JSON object is to | |
| return an empty text array | |
| **********************************************************************************/ | |
| method "emptyArray" | |
| array text($result;0) | |
| return($result) | |
| end method | |
| /********************************************************************************** | |
| newArray | |
| $inList -> Text The JSON array os enclosed in a ''' ''' herdoc string. | |
| JSON comma delimiters for the array had been changed to semi-colons at this point. | |
| Return either a text array, a longint array, an array of collections, or a real array based in contents. | |
| A parenthesis will assume a text array | |
| A decimal (.) will assume a real array | |
| An array of new collection(...) will create an array of collections (longint) after creating the collections | |
| If none of the above, it assumes an array of longint. | |
| **********************************************************************************/ | |
| method "newArray"($inList) | |
| $inList := trim($inList) | |
| $isNC := $inList = "new collection@" | |
| // Handle an array of collections separately - just deal with top level if nested collection | |
| if ($isNC) | |
| $level := 0 | |
| for each ($inList; $char; $index) | |
| case of | |
| :($char = "(") | |
| $level++ | |
| :(($char = ")") ) | |
| $level-- | |
| :(($char = ";") & ($level = 0)) | |
| $inList[[$index]] := "|" | |
| end case | |
| end for each | |
| $cnt := split string($inList;"|";$chunks) | |
| array longint($result;size of array($chunks)) | |
| for each ($chunks; $value; $index) | |
| $ncoll := trim($value) | |
| $result{$index} := execute("return ("+ $ncoll+ ")") // execute the new collection text | |
| end for each | |
| return($result) | |
| end if | |
| $isReal := "." ~ $inList | |
| $isText := '"' ~ $inList | |
| $count := split string($inList;";";$chunks) | |
| case of | |
| :($isText) | |
| array text($result;$count) | |
| for each ($chunks; $value; $index) | |
| $result{$index} := trim(replace string($value;'"';'')) | |
| end for each | |
| :($isReal) | |
| array real($result;$count) | |
| for each ($chunks; $value; $index) | |
| $result{$index} := num($value) | |
| end for each | |
| else | |
| array longint($result;$count) | |
| for each ($chunks; $value; $index) | |
| $result{$index} := num($value) | |
| end for each | |
| end case | |
| return($result) | |
| end method | |
| /********************************************************************************** | |
| null | |
| The response to finding and Null word in a JSON object is to | |
| return a nil pointer ( or could return char(0)) | |
| **********************************************************************************/ | |
| method "null" | |
| return(nil pointer) | |
| end method | |
| /********************************************************************************** | |
| newDate | |
| The response to finding and date in a JSON object that is a string formatted | |
| in the "Jan 2, 2011" format is to replace it with a 4D date | |
| **********************************************************************************/ | |
| method "newDate"($date) | |
| // replace date in Jan 2, 2011 with 4D date | |
| array string(3; $months; *; "Jan"; "Feb"; "Mar"; "Apr"; "May"; "Jun"; "Jul"; "Aug"; "Sep"; "Oct"; "Nov"; "Dec") | |
| $date := replace string($date;",";"") | |
| $cnt := split string($date;" ";$chunks) | |
| $tmp := string(find in array($months;$chunks{1}))+'/$chunks{2}/$chunks{3}' | |
| return(date($tmp)) | |
| end method | |
| $json := """ | |
| { | |
| "test-null":null, | |
| "test-empty-array": [], | |
| "test-empty-collection": {}, | |
| "test_true":true, | |
| "test_false":false, | |
| "test_reala":[3.34,43.5,445.2232], | |
| "test_integera":[3,5,66,77,88], | |
| "test_texta":["3uj","wd","wm","ib77","iu88"], | |
| "jobstageid":1852, | |
| "selected": | |
| [ | |
| { | |
| "citizen": | |
| { | |
| "citizen.phone1":"5552149891", | |
| "citizen.phone2":"5554799657", | |
| "citizen.Address":"51 Lefevere", | |
| "citizen.City":"Somewhere", | |
| "citizen.state":"AL", | |
| "citizen.zip":"01010", | |
| "citizen.firstName":"Aladrienne", | |
| "citizen.lastName":"Odom", | |
| "citizen.mi":"C", | |
| "citizen.emailAddress":"[email protected]", | |
| "citizen.birthMMDD":"1209", | |
| "action":"update", | |
| "id":153517 | |
| }, | |
| "cs_ad": | |
| { | |
| "citizen_stage.jobstageid":1852, | |
| "citizen_stage.score":"90.7761037140855", | |
| "application_data.answers":"g0102g0202g0302g0401g0501g0601g0701g0801g0901g1001g1101g1201g1301e0105e0110", | |
| "applicant_id":279 | |
| } | |
| }, | |
| { | |
| "citizen": | |
| { | |
| "citizen.phone1":"5552357646", | |
| "citizen.phone2":"5552850789", | |
| "citizen.Address":"4612 Meridian Street", | |
| "citizen.City":"Somewhere", | |
| "citizen.state":"MS", | |
| "citizen.zip":"01010", | |
| "citizen.firstName":"Farrah", | |
| "citizen.lastName":"Warren", | |
| "citizen.mi":"D", | |
| "citizen.emailAddress":"[email protected]", | |
| "citizen.birthMMDD":"0828", | |
| "action":"update", | |
| "id":153843 | |
| }, | |
| "cs_ad": | |
| { | |
| "citizen_stage.jobstageid":1852, | |
| "citizen_stage.score":"90.78486334968466", | |
| "application_data.answers":"g0102g0202g0301g0401g0501g0601g0701g0801g0901g1001g1101g1201g1301e0105", | |
| "applicant_id":417 | |
| } | |
| }, | |
| { | |
| "citizen": | |
| { | |
| "citizen.phone1":"5552325995", | |
| "citizen.phone2":"5554318634", | |
| "citizen.Address":"6527 Old Shell Rd. #64", | |
| "citizen.City":"Somewhere", | |
| "citizen.state":"AL", | |
| "citizen.zip":"01010", | |
| "citizen.firstName":"Ballery", | |
| "citizen.lastName":"Johnson", | |
| "citizen.mi":"", | |
| "citizen.emailAddress":"[email protected]", | |
| "citizen.birthMMDD":"1220", | |
| "action":"update", | |
| "id":154260 | |
| }, | |
| "cs_ad": | |
| { | |
| "citizen_stage.jobstageid":1852, | |
| "citizen_stage.score":"90.7761037140855", | |
| "application_data.answers":"g0102g0202g0301g0402g0501g0601g0701g0801g0901g1001g1101g1201g1301e0105e0111", | |
| "applicant_id":562 | |
| } | |
| } | |
| ] | |
| } """ | |
| $c := global.jsonParseSimple($json) | |
| a4d.debug.dump collection($c; "test";true) | |
| // an array of collections will not dump, but they are collections. | |
| for each ($c{"selected"}; $citizen; $index) | |
| a4d.debug.dump collection($citizen) | |
| end for each | |
| %> |
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