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jsonpath.js
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jsonpath.js
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/* 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
*
* Modified by Michael Glazer for Praetor.js (https://github.com/magnumjs/praetor.js)
* 3/9/2015
* Added function instead of eval
* Added function caching for performance
*
* TODO: more caching for regexes
* TODO: pluggable interface for different filters/expression/syntax etc...
*/
function jsonPath1(obj, expr, arg, cache) {
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.toUpperCase() == "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 {
var uid = JSON.stringify({query: x, obj: _v, index: _vname})
cache[uid] = cache[uid] || {};
if (!cache[uid].functionToInvoke) {
var fun =function (x, _v, _vname, $) {
if(!cache[uid].innerFunctionToInvoke) {
var actionToCall = 'return x.replace(/(^|[^\\\\])@/g, "$1_v").replace(/\\@/g, "@")'
cache[uid].innerFunctionToInvoke= new Function(['x', '_v', '_vname', '$'],
actionToCall);
}
x = cache[uid].innerFunctionToInvoke.apply(this, [x, _v, _vname, $])
// TODO: cache seconday function below is it possible or NO since signature is totally dynamic
var action2 = 'return ' + x;
var re = new Function(['x', '_v', '_vname', '$'], action2);
var x2 = re.apply(this, [x, _v, _vname, $])
return x2;
}.bind(this);
cache[uid] = {functionToInvoke: fun};
}
var x2 = cache[uid].functionToInvoke(x, _v, _vname, $)
return $ && _v && x2;
} // 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.toUpperCase() == "VALUE" || P.resultType.toUpperCase()
== "PATH")) {
P.trace(P.normalize(expr).replace(/^\$;?/, ""), obj, "$"); // issue 6 resolved
return P.result.length ? P.result : false;
}
}
var JSONPath = (function () {
return function(opts, obj, expr) {
this.cache = this.cache || {}
return jsonPath1(obj, expr, opts, this.cache);
}
})()