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79 lines
2.1 KiB
TypeScript
79 lines
2.1 KiB
TypeScript
'use strict';
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import * as JsonPointerLib from 'json-pointer';
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const origParse = JsonPointerLib.parse;
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/**
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* Wrapper for JsonPointer. Provides common operations
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*/
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export class JsonPointer {
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/**
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* returns last JsonPointer token
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* if level > 1 returns levels last (second last/third last)
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* @example
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* // returns subpath
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* JsonPointerHelper.baseName('/path/0/subpath')
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* // returns foo
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* JsonPointerHelper.baseName('/path/foo/subpath', 2)
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*/
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static baseName(pointer, level=1) {
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let tokens = JsonPointer.parse(pointer);
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return tokens[tokens.length - (level)];
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}
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/**
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* returns dirname of pointer
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* if level > 1 returns corresponding dirname in the hierarchy
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* @example
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* // returns /path/0
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* JsonPointerHelper.dirName('/path/0/subpath')
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* // returns /path
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* JsonPointerHelper.dirName('/path/foo/subpath', 2)
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*/
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static dirName(pointer, level=1) {
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let tokens = JsonPointer.parse(pointer);
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return JsonPointerLib.compile(tokens.slice(0, tokens.length - level));
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}
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/**
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* overridden JsonPointer original parse to take care of prefixing '#' symbol
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* that is not valid JsonPointer
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*/
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static parse(pointer) {
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let ptr = pointer;
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if (ptr.charAt(0) === '#') {
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ptr = ptr.substring(1);
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}
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return origParse(ptr);
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}
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/**
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* Creates a JSON pointer path, by joining one or more tokens to a base path.
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*
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* @param {string} base - The base path
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* @param {string|string[]} tokens - The token(s) to append (e.g. ["name", "first"])
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* @returns {string}
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*/
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static join(base, tokens) {
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// TODO: optimize
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let baseTokens = JsonPointer.parse(base);
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let resTokens = baseTokens.concat(tokens);
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return JsonPointerLib.compile(resTokens);
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}
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static get(object: Object, pointer:string) {
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return JsonPointerLib.get(object, pointer);
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}
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static compile(tokens: string[]) {
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return JsonPointerLib.compile(tokens);
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}
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static escape(pointer: string) {
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return JsonPointerLib.escape(pointer);
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}
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}
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JsonPointerLib.parse = JsonPointer.parse;
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Object.assign(JsonPointer, JsonPointerLib);
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export default JsonPointer;
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