OmniMark Language Support for VS Code

Syntax highlighting, snippets, and language support for the OmniMark programming language.

Supports .xom, .xin, .xmd, and .xar files.

Features

The extension provides advanced OmniMark language support, including:

• Syntax highlighting for all OmniMark keywords, operators, character classes, built-in streams, strings, comments, and format escape sequences
• Autocomplete (Completion): Context-aware suggestions for OmniMark keywords, streams, snippets, operators, character classes, and user-defined functions. As you type, the extension offers completions for both built-in and custom code.
• User Function Completion: Scans all OmniMark files in your workspace and suggests user-defined functions in autocomplete, including their location and quick insertion as function calls.
• Rich Snippet Completions: Snippets are available directly in autocomplete, not just via prefix, making it faster to insert common constructs.
• Code snippets for all common constructs (rules, loops, conditionals, functions, shelves, catch/throw, XML/SGML parsing)
• Hover documentation for keywords, built-ins, and rules, with syntax, description, and examples (offline, based on OmniMark 11.0 docs)
• Auto-indentation for do...done, repeat...again, element, find, etc.
• Bracket matching and auto-close for {}, [], (), ", '
• Line comments with ;
• Go to Definition / Peek Definition: Use Ctrl+Click or F12 to jump to function, rule, or keyword definitions in OmniMark files, including user-defined functions.
• Language configuration: Custom word pattern, indentation rules, and on-enter actions for OmniMark
• Language ID: omnimark (for use in .github/copilot-instructions.md fenced code blocks)
• Automatic activation: Extension activates for OmniMark files (.xom, .xin, .xmd, .xar)

Snippets Reference

Prefix	Description
process	Main process rule
process-start	Initialization rule
process-end	Termination rule
find	Pattern find rule
element	XML/SGML element rule
elementattr	Element rule passing through attributes
xmlparse	do xml-parse block
sgmlparse	do sgml-parse block
xmlskeleton	Full XML transformation skeleton
dowhen	do when...else...done block
dowhenmulti	Multi-branch conditional
doselect	do select...case block
doscan	do scan...match block
repeat	Basic repeat...again loop
repeatover	repeat over shelf iteration
gstream	Global stream declaration
gcounter	Global counter declaration
gswitch	Global switch declaration
gshelf	Global variable shelf
lstream	Local stream declaration
lcounter	Local counter declaration
openbuffer	Open/write/close a buffer stream
usingoutput	using output as block
deffunc	Define a function with return value
defvoid	Define a void function
declarecatch	Declare a named exception
catcherror	Catch #program-error
catchexternal	Catch #external-exception
group	Rule group declaration
usinggroup	Activate a rule group
macro	Macro definition
include	Include file
outputd	Output counter as formatted string

Installation

From VSIX (manual)

1. Download omnimark-language-1.0.0.vsix
2. In VS Code: Extensions → ... (top right) → Install from VSIX...
3. Select the file and reload VS Code

From source

npm install -g @vscode/vsce
cd vscode-omnimark
vsce package
# generates omnimark-language-1.0.0.vsix
code --install-extension omnimark-language-1.0.0.vsix

Publish to Marketplace

# Create a publisher at https://marketplace.visualstudio.com/manage
# Then:
vsce publish

Development

# Install dependencies
npm install

# Open in VS Code with extension host
code .
# Press F5 to launch Extension Development Host

Based on

• jEdit OmniMark syntax mode by Lionel Fiol
• OmniMark 11.0 official documentation at https://developers.stilo.com/docs11.0.3/html/