- Author:
- David Nickerson <nickerso@users.sourceforge.net>
- Date:
- 2009-07-16 02:00:03+12:00
- Desc:
- the starting point for the HH tutorial example
- Permanent Source URI:
- https://models.fieldml.org/workspace/a1/rawfile/f6a8f90307388eb4b040ee3566b84d88b59247f7/dojo-presentation/js/dojo/dojox/jsonPath/query.js
dojo.provide("dojox.jsonPath.query");
dojox.jsonPath.query = function(/*Object*/obj, /*String*/expr, /*Object*/arg){
// summaRy
// Perform jsonPath query `expr` on javascript object or json string `obj`
// obj - object || json string to perform query on
// expr - jsonPath expression (string) to be evaluated
// arg - {}special arugments.
// resultType: "VALUE"||"BOTH"||"PATH"} (defaults to value)
// evalType: "RESULT"||"ITEM"} (defaults to ?)
var re = dojox.jsonPath._regularExpressions;
if (!arg){arg={};}
var strs = [];
function _str(i){ return strs[i];}
var acc;
if (arg.resultType == "PATH" && arg.evalType == "RESULT") throw Error("RESULT based evaluation not supported with PATH based results");
var P = {
resultType: arg.resultType || "VALUE",
normalize: function(expr){
var subx = [];
expr = expr.replace(/'([^']|'')*'/g, function(t){return "_str("+(strs.push(eval(t))-1)+")";});
var ll = -1;
while(ll!=subx.length){
ll=subx.length;//TODO: Do expression syntax checking
expr = expr.replace(/(\??\([^\(\)]*\))/g, function($0){return "#"+(subx.push($0)-1);});
}
expr = expr.replace(/[\['](#[0-9]+)[\]']/g,'[$1]')
.replace(/'?\.'?|\['?/g, ";")
.replace(/;;;|;;/g, ";..;")
.replace(/;$|'?\]|'$/g, "");
ll = -1;
while(ll!=expr){
ll=expr;
expr = expr.replace(/#([0-9]+)/g, function($0,$1){return subx[$1];});
}
return expr.split(";");
},
asPaths: function(paths){
for (var j=0;j<paths.length;j++){
var p = "$";
var x= paths[j];
for (var i=1,n=x.length; i<n; i++)
p += /^[0-9*]+$/.test(x[i]) ? ("["+x[i]+"]") : ("['"+x[i]+"']");
paths[j]=p;
}
return paths;
},
exec: function(locs, val, rb){
var path = ['$'];
var result=rb?val:[val];
var paths=[path];
function add(v, p,def){
if (v && v.hasOwnProperty(p) && P.resultType != "VALUE") paths.push(path.concat([p]));
if (def)
result = v[p];
else if (v && v.hasOwnProperty(p))
result.push(v[p]);
}
function desc(v){
result.push(v);
paths.push(path);
P.walk(v,function(i){
if (typeof v[i] ==='object') {
var oldPath = path;
path = path.concat(i);
desc(v[i]);
path = oldPath;
}
});
}
function slice(loc, val){
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)
add(val,i);
}
}
function repStr(str){
var i=loc.match(/^_str\(([0-9]+)\)$/);
return i?strs[i[1]]:str;
}
function oper(val){
if (/^\(.*?\)$/.test(loc)) // [(expr)]
add(val, P.eval(loc, val),rb);
else if (loc === "*"){
P.walk(val, rb && val instanceof Array ? // if it is result based, there is no point to just return the same array
function(i){P.walk(val[i],function(j){ add(val[i],j); })} :
function(i){ add(val,i); });
}
else if (loc === "..")
desc(val);
else if (/,/.test(loc)){ // [name1,name2,...]
for (var s=loc.split(/'?,'?/),i=0,n=s.length; i<n; i++)
add(val,repStr(s[i]));
}
else if (/^\?\(.*?\)$/.test(loc)) // [?(expr)]
P.walk(val, function(i){ if (P.eval(loc.replace(/^\?\((.*?)\)$/,"$1"),val[i])) add(val,i); });
else if (/^(-?[0-9]*):(-?[0-9]*):?([0-9]*)$/.test(loc)) // [start:end:step] python slice syntax
slice(loc, val);
else {
loc=repStr(loc);
if (rb && val instanceof Array && !/^[0-9*]+$/.test(loc))
P.walk(val, function(i){ add(val[i], loc)});
else
add(val,loc,rb);
}
}
while (locs.length){
var loc = locs.shift();
if ((val = result) === null || val===undefined) return val;
result = [];
var valPaths = paths;
paths = [];
if (rb)
oper(val)
else
P.walk(val,function(i){path=valPaths[i]||path;oper(val[i])});
}
if (P.resultType == "BOTH"){
paths = P.asPaths(paths);
var newResult = [];
for (var i =0;i <paths.length;i++)
newResult.push({path:paths[i],value:result[i]});
return newResult;
}
return P.resultType == "PATH" ? P.asPaths(paths):result;
},
walk: function(val, f){
if (val instanceof Array){
for (var i=0,n=val.length; i<n; i++)
if (i in val)
f(i);
}
else if (typeof val === "object"){
for (var m in val)
if (val.hasOwnProperty(m))
f(m);
}
},
eval: function(x, _v){
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){
return P.exec(P.normalize(expr).slice(1), obj, arg.evalType == "RESULT");
}
return false;
};
