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Npm capable version

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1 parent 66909fd commit af03949f2889d7df80885ea51ccdb7cfd845ce18 @s3u committed May 7, 2011
Showing with 103 additions and 0 deletions.
  1. +90 −0 lib/jsonpath.js
  2. +13 −0 package.json
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+/* JSONPath 0.8.0 - XPath for JSON
+ *
+ * Copyright (c) 2007 Stefan Goessner (goessner.net)
+ * Licensed under the MIT (MIT-LICENSE.txt) licence.
+ */
+
+exports.eval = jsonPath;
+
+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){return "[#"+(subx.push($1)-1)+"]";})
+ .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)) { // [name1,name2,...]
+ for (var s=loc.split(/'?,'?/),i=0,n=s.length; i<n; i++)
+ P.trace(s[i]+";"+x, val, path);
+ }
+ 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(/^\?\((.*?)\)$/,"$1"),v[m],m)) P.trace(m+";"+x,v,p); });
+ else if (/^(-?[0-9]*):(-?[0-9]*):?([0-9]*)$/.test(loc)) // [start:end:step] phyton slice syntax
+ P.slice(loc, 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, "_v")); }
+ catch(e) { throw new SyntaxError("jsonPath: " + e.message + ": " + x.replace(/@/g, "_v").replace(/\^/g, "_a")); }
+ }
+ };
+
+ var $ = obj;
+ if (expr && obj && (P.resultType == "VALUE" || P.resultType == "PATH")) {
+ P.trace(P.normalize(expr).replace(/^\$;/,""), obj, "$");
+ return P.result.length ? P.result : false;
+ }
+}
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+{
+ "author": "Stefan Goessner",
+ "name": "JSONPath",
+ "description": "A JS implementation of JSONPath",
+ "version": "0.8.0",
+ "repository": {
+ "type": "git",
+ "url": "git://github.com/s3u/JSONPath.git"
+ },
+ "main" : "./lib/jsonpath",
+ "dependencies": {},
+ "devDependencies": {}
+}

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