apache/daffodil-vscode

Discussion + Feature Request: Implement Intellisense for DFDL Functions

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#1,514 opened on Nov 5, 2025

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code completionenhancementhelp wanted

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Description

Feature Request: Implement Intellisense for DFDL Functions

Problem Description

The extension currently doesn't provide IntelliSense suggestions for functions. See https://daffodil.apache.org/docs/dfdl/#_Toc62570225 and https://daffodil.apache.org/docs/dfdl/#_Toc62570222.

A feature that can be added to IntelliSense functionality is implementing functions.

Proposed Solution

Proposed solution will be explored further via discussions in this ticket. Additional subtasks will be added.

Acceptance Criteria

Not applicable just yet. Most likely, a checklist will be added.

Impact and Benefits

This feature will expand out the extension's IntelliSense capabilities and implement more DFDL functionality.

Open Questions / Discussion Points

Please discuss anything relating to the additions in this ticket.

Contributor guide

Research direction
Investigate existing DFDL function references and how to integrate them into VSCode's completion provider.
Tech stack
typescript
Domain
developer experience
Issue type
Feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-2 days
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Fresh
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Mostly clear
Prerequisites
TypeScriptVS Code APIDFDL
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
60