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ts-xpath

XPath Parser for TypeScript

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ts-xpath

This is a modified version of js-xpath. It is adapted for use with TypeScript and is compiled using npm run build.

Usage

npm install ts-xpath
import { XPathParser } from 'ts-xpath';

let parser = new XPathParser();
let parsed = parser.parse("//node");

xpath-models.ts provides a default XPathModels which does not support the hashtag preprocessor. If you want to support hashtags within xpaths, you can use:

let hashtagConfig: XPathModels.HashtagConfig = {
  isValidNamespace: (namespace: string) => boolean,
  hashtagToXPath: (hashtagExpr: string) => string | null,
  toHashtag: (xpath: IXPathExpression) => string | null
}
parser.hashtagConfig = hashtagConfig;

hashtags use the format #namespace/arbitrarily/long/path and do not support filtering

Tests

  • Run yarn test to run tests.

Known Limitations

  • Filter expressions are not supported due to a known bug in jison.
  • See the failing tests for examples of expressions that are known not to work.

Build

This is built using a fork of jison. To build the parser file yourself run:

$ yarn build - This will build both the distribution (webpack) package in dist/ and rebuild the Jison parser (src/jison/xpath.js) from the src/jison/ files. $ yarn jison - Rebuild parser.js from the Jison specification files.

For more information on jison see the jison project website at: http://zaach.github.com/jison/.

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Package last updated on 16 Feb 2023

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