jsonplus/parse.js at master · nodeonly/jsonplus · GitHub

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'use strict';
// Helper to strip comments
varstrip=require('strip-json-comments');
// Tag matcher
vartag=/^\@self[\.\[]/;

/**
 * Check given object is Actual object or not
 * @param {any} obj obj to check against
 * @return {Boolean} true if object is object
 */
functionisObject(obj){
returnobj===Object(obj)&&!Array.isArray(obj);
}

/**
 * Resolves JS array notation in string to actual value
 * @param {Object} object Actual Object
 * @param {string} reference path defined in string
 * @return {any} matched value or undefined when not found
 */
functionresolvePath(object,reference){
functionarrDeref(o,ref){
varkey=ref.replace(/^['"]|['"\]]+$/g,'');
return!ref ? o : (o[key]);
}

functiondotDeref(o,ref){
returnref.split('[').reduce(arrDeref,o);
}

return!reference ? object : reference.split('.').reduce(dotDeref,object);
}

/**
 * Simple template tag matcher, finds tags and
 * evalues values
 * @param {object} object Object itself to resolve tags agains
 * @param {string} template String to look for tags
 * @return {string} Evaluated string
 */
functionparseTemplate(object,template){
varhtml=template||'';
returnhtml.replace(/\{\{\s*(.*?)\s*\}\}/gim,function(all,match){
returnresolvePath(object,match.replace(tag,''))||all;
});
}

/**
 * Recursively goes through JSON object and resolves
 * all self references
 * @param {Object} obj JSON Object part
 * @param {Object} self Full object
 * @return {Object} evaluated JSON Object part
 */
functionresolve(obj,self){
varnewObj;
self=self||obj;

// If object go through each value and call self again
if(isObject(obj)){
newObj={};
Object.keys(obj).forEach(function(key){
newObj[key]=resolve(obj[key],self);
});
}

// if array go through each item and call self
elseif(Array.isArray(obj)){
newObj=obj.map(function(val){
returnresolve(val,self);
});
}

// if string and starts with the refrence tag
// evaluate and return new value
elseif(typeofobj==='string'&&tag.test(obj)){
newObj=resolvePath(self,obj.replace(tag,''));
}

// if string check for template tags
elseif(typeofobj==='string'){
newObj=parseTemplate(self,obj);
}

// anything else
else{
newObj=obj;
}

// yes
returnnewObj;
}

/**
 * Parses json string by removing comments and resolving self references
 * @param {string} data JSON string
 * @return {Object} parsed JSON Object
 */
exports.parse=functionjsonPlusParse(data){
varobj=JSON.parse(strip(data));
obj=resolve(obj);
returnobj;
};

exports.resolve=resolve;