/* JSONPath 0.8.5 - XPath for JSON * * Copyright (c) 2007 Stefan Goessner (goessner.net) * Licensed under the MIT (MIT-LICENSE.txt) licence. * * Proposal of Chris Zyp goes into version 0.9.x * Issue 7 resolved */ function jsonPath(obj, expr, arg) { var P = { resultType: arg && arg.resultType || "VALUE", result: [], normalize: function(expr) { var subx = []; return expr.replace(/[\['](\??\(.*?\))[\]']|\['(.*?)'\]/g, function($0,$1,$2){return "[#"+(subx.push($1||$2)-1)+"]";}) /* http://code.google.com/p/jsonpath/issues/detail?id=4 */ .replace(/'?\.'?|\['?/g, ";") .replace(/;;;|;;/g, ";..;") .replace(/;$|'?\]|'$/g, "") .replace(/#([0-9]+)/g, function($0,$1){return subx[$1];}); }, asPath: function(path) { var x = path.split(";"), p = "$"; for (var i=1,n=x.length; i<n; i++) p += /^[0-9*]+$/.test(x[i]) ? ("["+x[i]+"]") : ("['"+x[i]+"']"); return p; }, store: function(p, v) { if (p) P.result[P.result.length] = P.resultType == "PATH" ? P.asPath(p) : v; return !!p; }, trace: function(expr, val, path) { if (expr !== "") { var x = expr.split(";"), loc = x.shift(); x = x.join(";"); if (val && val.hasOwnProperty(loc)) P.trace(x, val[loc], path + ";" + loc); else if (loc === "*") P.walk(loc, x, val, path, function(m,l,x,v,p) { P.trace(m+";"+x,v,p); }); else if (loc === "..") { P.trace(x, val, path); P.walk(loc, x, val, path, function(m,l,x,v,p) { typeof v[m] === "object" && P.trace("..;"+x,v[m],p+";"+m); }); } else if (/^\(.*?\)$/.test(loc)) // [(expr)] P.trace(P.eval(loc, val, path.substr(path.lastIndexOf(";")+1))+";"+x, val, path); else if (/^\?\(.*?\)$/.test(loc)) // [?(expr)] P.walk(loc, x, val, path, function(m,l,x,v,p) { if (P.eval(l.replace(/^\?\((.*?)\)$/,"$1"), v instanceof Array ? v[m] : v, m)) P.trace(m+";"+x,v,p); }); // issue 5 resolved else if (/^(-?[0-9]*):(-?[0-9]*):?([0-9]*)$/.test(loc)) // [start:end:step] phyton slice syntax P.slice(loc, x, val, path); else if (/,/.test(loc)) { // [name1,name2,...] for (var s=loc.split(/'?,'?/),i=0,n=s.length; i<n; i++) P.trace(s[i]+";"+x, val, path); } } else P.store(path, val); }, walk: function(loc, expr, val, path, f) { if (val instanceof Array) { for (var i=0,n=val.length; i<n; i++) if (i in val) f(i,loc,expr,val,path); } else if (typeof val === "object") { for (var m in val) if (val.hasOwnProperty(m)) f(m,loc,expr,val,path); } }, slice: function(loc, expr, val, path) { if (val instanceof Array) { var len=val.length, start=0, end=len, step=1; loc.replace(/^(-?[0-9]*):(-?[0-9]*):?(-?[0-9]*)$/g, function($0,$1,$2,$3){start=parseInt($1||start);end=parseInt($2||end);step=parseInt($3||step);}); start = (start < 0) ? Math.max(0,start+len) : Math.min(len,start); end = (end < 0) ? Math.max(0,end+len) : Math.min(len,end); for (var i=start; i<end; i+=step) P.trace(i+";"+expr, val, path); } }, eval: function(x, _v, _vname) { try { return $ && _v && eval(x.replace(/(^|[^\\])@/g, "$1_v").replace(/\\@/g, "@")); } // issue 7 : resolved .. catch(e) { throw new SyntaxError("jsonPath: " + e.message + ": " + x.replace(/(^|[^\\])@/g, "$1_v").replace(/\\@/g, "@")); } // issue 7 : resolved .. } }; var $ = obj; if (expr && obj && (P.resultType == "VALUE" || P.resultType == "PATH")) { P.trace(P.normalize(expr).replace(/^\$;?/,""), obj, "$"); // issue 6 resolved return P.result.length ? P.result : false; } }