98 lines
3.0 KiB
JavaScript
98 lines
3.0 KiB
JavaScript
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'use strict';
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/**
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* escapes JSON Pointer using ~0 for ~ and ~1 for /
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* @param s the string to escape
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* @return the escaped string
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*/
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function jpescape(s) {
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return s.replace(/\~/g, '~0').replace(/\//g, '~1');
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}
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/**
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* unescapes JSON Pointer using ~0 for ~ and ~1 for /
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* @param s the string to unescape
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* @return the unescaped string
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*/
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function jpunescape(s) {
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return s.replace(/\~1/g, '/').replace(/~0/g, '~');
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}
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// JSON Pointer specification: http://tools.ietf.org/html/rfc6901
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/**
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* from obj, return the property with a JSON Pointer prop, optionally setting it
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* to newValue
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* @param obj the object to point into
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* @param prop the JSON Pointer or JSON Reference
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* @param newValue optional value to set the property to
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* @return the found property, or false
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*/
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function jptr(obj, prop, newValue) {
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if (typeof obj === 'undefined') return false;
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if (!prop || typeof prop !== 'string' || (prop === '#')) return (typeof newValue !== 'undefined' ? newValue : obj);
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if (prop.indexOf('#')>=0) {
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let parts = prop.split('#');
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let uri = parts[0];
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if (uri) return false; // we do internal resolution only
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prop = parts[1];
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prop = decodeURIComponent(prop.slice(1).split('+').join(' '));
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}
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if (prop.startsWith('/')) prop = prop.slice(1);
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let components = prop.split('/');
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for (let i=0;i<components.length;i++) {
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components[i] = jpunescape(components[i]);
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let setAndLast = (typeof newValue !== 'undefined') && (i == components.length-1);
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let index = parseInt(components[i],10);
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if (!Array.isArray(obj) || isNaN(index) || (index.toString() !== components[i])) {
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index = (Array.isArray(obj) && components[i] === '-') ? -2 : -1;
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}
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else {
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components[i] = (i > 0) ? components[i-1] : ''; // backtrack to indexed property name
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}
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if ((index != -1) || (obj && obj.hasOwnProperty(components[i]))) {
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if (index >= 0) {
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if (setAndLast) {
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obj[index] = newValue;
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}
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obj = obj[index];
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}
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else if (index === -2) {
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if (setAndLast) {
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if (Array.isArray(obj)) {
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obj.push(newValue);
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}
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return newValue;
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}
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else return undefined;
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}
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else {
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if (setAndLast) {
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obj[components[i]] = newValue;
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}
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obj = obj[components[i]];
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}
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}
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else {
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if ((typeof newValue !== 'undefined') && (typeof obj === 'object') &&
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(!Array.isArray(obj))) {
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obj[components[i]] = (setAndLast ? newValue : ((components[i+1] === '0' || components[i+1] === '-') ? [] : {}));
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obj = obj[components[i]];
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}
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else return false;
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}
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}
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return obj;
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}
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module.exports = {
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jptr : jptr,
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jpescape : jpescape,
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jpunescape : jpunescape
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};
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