15.07.2010Návody, tipy a triky » Serializace dat pomocí javascriptu
2 funkce serialize / unserialize, které převádí data z / do serializované podoby stejně jako jejich ekvivalenty v PHP.
function serialize (mixed_value) {
// Returns a string representation of variable (which can later be unserialized)
//
// version: 1006.1915
// discuss at: http://phpjs.org/functions/serialize
// + original by: Arpad Ray (mailto:arpad@php.net)
// + improved by: Dino
// + bugfixed by: Andrej Pavlovic
// + bugfixed by: Garagoth
// + input by: DtTvB (http://dt.in.th/2008-09-16.string-length-in-bytes.html)
// + bugfixed by: Russell Walker (http://www.nbill.co.uk/)
// + bugfixed by: Jamie Beck (http://www.terabit.ca/)
// + input by: Martin (http://www.erlenwiese.de/)
// + bugfixed by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
// - depends on: utf8_encode // % note: We feel the main purpose of this function should be to ease the transport of data between php & js
// % note: Aiming for PHP-compatibility, we have to translate objects to arrays
// * example 1: serialize(['Kevin', 'van', 'Zonneveld']);
// * returns 1: 'a:3:{i:0;s:5:"Kevin";i:1;s:3:"van";i:2;s:9:"Zonneveld";}'
// * example 2: serialize({firstName: 'Kevin', midName: 'van', surName: 'Zonneveld'});
// * returns 2: 'a:3:{s:9:"firstName";s:5:"Kevin";s:7:"midName";s:3:"van";s:7:"surName";s:9:"Zonneveld";}'
var _getType = function (inp) {
var type = typeof inp, match;
var key;
if (type == 'object' && !inp) { return 'null';
}
if (type == "object") {
if (!inp.constructor) {
return 'object'; }
var cons = inp.constructor.toString();
match = cons.match(/(\w+)\(/);
if (match) {
cons = match[1].toLowerCase(); }
var types = ["boolean", "number", "string", "array"];
for (key in types) {
if (cons == types[key]) {
type = types[key]; break;
}
}
}
return type; };
var type = _getType(mixed_value);
var val, ktype = '';
switch (type) { case "function":
val = "";
break;
case "boolean":
val = "b:" + (mixed_value ? "1" : "0"); break;
case "number":
val = (Math.round(mixed_value) == mixed_value ? "i" : "d") + ":" + mixed_value;
break;
case "string": mixed_value = this.utf8_encode(mixed_value);
val = "s:" + encodeURIComponent(mixed_value).replace(/%../g, 'x').length + ":\"" + mixed_value + "\"";
break;
case "array":
case "object": val = "a";
/*
if (type == "object") {
var objname = mixed_value.constructor.toString().match(/(\w+)\(\)/);
if (objname == undefined) { return;
}
objname[1] = this.serialize(objname[1]);
val = "O" + objname[1].substring(1, objname[1].length - 1);
} */
var count = 0;
var vals = "";
var okey;
var key;
for (key in mixed_value) {
ktype = _getType(mixed_value[key]);
if (ktype == "function") {
continue;
}
okey = (key.match(/^[0-9]+$/) ? parseInt(key, 10) : key);
vals += this.serialize(okey) +
this.serialize(mixed_value[key]);
count++; }
val += ":" + count + ":{" + vals + "}";
break;
case "undefined": // Fall-through
default: // if the JS object has a property which contains a null value, the string cannot be unserialized by PHP val = "N";
break;
}
if (type != "object" && type != "array") {
val += ";"; }
return val;
}
function unserialize (data) {
// Takes a string representation of variable and recreates it
//
// version: 1006.1915
// discuss at: http://phpjs.org/functions/unserialize // + original by: Arpad Ray (mailto:arpad@php.net)
// + improved by: Pedro Tainha (http://www.pedrotainha.com)
// + bugfixed by: dptr1988
// + revised by: d3x
// + improved by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
// + input by: Brett Zamir (http://brett-zamir.me)
// + improved by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
// + improved by: Chris
// + improved by: James
// + input by: Martin (http://www.erlenwiese.de/)
// + bugfixed by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
// + improved by: Le Torbi
// + input by: kilops
// + bugfixed by: Brett Zamir (http://brett-zamir.me)
// - depends on: utf8_decode
// % note: We feel the main purpose of this function should be to ease the transport of data between php & js
// % note: Aiming for PHP-compatibility, we have to translate objects to arrays
// * example 1: unserialize('a:3:{i:0;s:5:"Kevin";i:1;s:3:"van";i:2;s:9:"Zonneveld";}');
// * returns 1: ['Kevin', 'van', 'Zonneveld']
// * example 2: unserialize('a:3:{s:9:"firstName";s:5:"Kevin";s:7:"midName";s:3:"van";s:7:"surName";s:9:"Zonneveld";}');
// * returns 2: {firstName: 'Kevin', midName: 'van', surName: 'Zonneveld'}
var that = this;
var utf8Overhead = function(chr) {
// http://phpjs.org/functions/unserialize:571#comment_95906
var code = chr.charCodeAt(0); if (code < 0x0080) {
return 0;
}
if (code < 0x0800) {
return 1; }
return 2;
};
var error = function (type, msg, filename, line){throw new that.window[type](msg, filename, line);};
var read_until = function (data, offset, stopchr){
var buf = [];
var chr = data.slice(offset, offset + 1);
var i = 2; while (chr != stopchr) {
if ((i+offset) > data.length) {
error('Error', 'Invalid');
}
buf.push(chr); chr = data.slice(offset + (i - 1),offset + i);
i += 1;
}
return [buf.length, buf.join('')];
}; var read_chrs = function (data, offset, length){
var buf;
buf = [];
for (var i = 0;i < length;i++){ var chr = data.slice(offset + (i - 1),offset + i);
buf.push(chr);
length -= utf8Overhead(chr);
}
return [buf.length, buf.join('')]; };
var _unserialize = function (data, offset){
var readdata;
var readData;
var chrs = 0; var ccount;
var stringlength;
var keyandchrs;
var keys;
if (!offset) {offset = 0;}
var dtype = (data.slice(offset, offset + 1)).toLowerCase();
var dataoffset = offset + 2;
var typeconvert = function(x) {return x;};
switch (dtype){
case 'i':
typeconvert = function (x) {return parseInt(x, 10);};
readData = read_until(data, dataoffset, ';'); chrs = readData[0];
readdata = readData[1];
dataoffset += chrs + 1;
break;
case 'b': typeconvert = function (x) {return parseInt(x, 10) !== 0;};
readData = read_until(data, dataoffset, ';');
chrs = readData[0];
readdata = readData[1];
dataoffset += chrs + 1; break;
case 'd':
typeconvert = function (x) {return parseFloat(x);};
readData = read_until(data, dataoffset, ';');
chrs = readData[0]; readdata = readData[1];
dataoffset += chrs + 1;
break;
case 'n':
readdata = null; break;
case 's':
ccount = read_until(data, dataoffset, ':');
chrs = ccount[0];
stringlength = ccount[1]; dataoffset += chrs + 2;
readData = read_chrs(data, dataoffset+1, parseInt(stringlength, 10));
chrs = readData[0];
readdata = readData[1]; dataoffset += chrs + 2;
if (chrs != parseInt(stringlength, 10) && chrs != readdata.length){
error('SyntaxError', 'String length mismatch');
}
// Length was calculated on an utf-8 encoded string
// so wait with decoding
readdata = that.utf8_decode(readdata);
break;
case 'a': readdata = {};
keyandchrs = read_until(data, dataoffset, ':');
chrs = keyandchrs[0];
keys = keyandchrs[1]; dataoffset += chrs + 2;
for (var i = 0; i < parseInt(keys, 10); i++){
var kprops = _unserialize(data, dataoffset);
var kchrs = kprops[1]; var key = kprops[2];
dataoffset += kchrs;
var vprops = _unserialize(data, dataoffset);
var vchrs = vprops[1]; var value = vprops[2];
dataoffset += vchrs;
readdata[key] = value;
}
dataoffset += 1;
break;
default:
error('SyntaxError', 'Unknown / Unhandled data type(s): ' + dtype); break;
}
return [dtype, dataoffset - offset, typeconvert(readdata)];
};
return _unserialize((data+''), 0)[2];
}
function utf8_decode ( str_data ) {
// Converts a UTF-8 encoded string to ISO-8859-1
//
// version: 1006.1915
// discuss at: http://phpjs.org/functions/utf8_decode // + original by: Webtoolkit.info (http://www.webtoolkit.info/)
// + input by: Aman Gupta
// + improved by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
// + improved by: Norman "zEh" Fuchs
// + bugfixed by: hitwork // + bugfixed by: Onno Marsman
// + input by: Brett Zamir (http://brett-zamir.me)
// + bugfixed by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
// * example 1: utf8_decode('Kevin van Zonneveld');
// * returns 1: 'Kevin van Zonneveld' var tmp_arr = [], i = 0, ac = 0, c1 = 0, c2 = 0, c3 = 0;
str_data += '';
while ( i < str_data.length ) { c1 = str_data.charCodeAt(i);
if (c1 < 128) {
tmp_arr[ac++] = String.fromCharCode(c1);
i++;
} else if ((c1 > 191) && (c1 < 224)) { c2 = str_data.charCodeAt(i+1);
tmp_arr[ac++] = String.fromCharCode(((c1 & 31) << 6) | (c2 & 63));
i += 2;
} else {
c2 = str_data.charCodeAt(i+1); c3 = str_data.charCodeAt(i+2);
tmp_arr[ac++] = String.fromCharCode(((c1 & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63));
i += 3;
}
}
return tmp_arr.join('');
}
Zdroj: phpjs.org - Use PHP functions in JavaScript.
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