XPath 3.1 Notebook

A work in progress. The XPath 3.1 Notebook extension for Visual Studio Code provides Jupyter style notebook functionality for the XPath 3.1 language.

Notebook Cell Evaluation of XPath

Notebook cells with the XPath language id are evaluated using Saxon-JS. The evaluation context is the document node of the most recently selected non-notebook editor.

XPath cell features

• Syntax highlighting
• XPath code formatting
• XPath expression checking - basic syntax problems highlighted
• Evaluation context item - set to document node from XML in last open editor
• In-scope XML namespace prefix checking - using last open XML document element
• XML namespace context extracted from the context item
• The $_ variable is set to the result of the last XPath cell evaluated
• Evaluation result is shown with JSON-like syntax and formatting
• Evaluation result showså the XPath location of any XML nodes in the result
• XPath runtime error reporting - parses Node.js exception

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Screenshot

XPath 3.1 Notebook cells. Here, the result of the lower cell uses $_ to reference the previous cell result:

Implementation

This extension provides a Notebook Kernel that effectively wraps the Node.js REPL based NodeKernel.

To run from the reposistory, you need to first load dependencies. This project uses yarn for package management, so run:

yarn