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