Professional syntax highlighting, IntelliSense, error checking, and code completion for the C<< systems language.

Features

✨ Syntax Highlighting

Keywords: Control flow (if, else, while, for, foreach, switch), declarations (def, struct, enum, namespace), and special C<< keywords (tunnel, move, reserve, voided, valid)
Types: Primitive types (int8, int32, float64, etc.), pointers, arrays, and slices
Comments: Single-line (//) and multi-line (/* */) comments
Strings: Quoted strings and raw strings (raw<until "DELIM">, raw<N>)
Numbers: Integer and floating-point literals

🧠 IntelliSense & Autocomplete

Context-aware suggestions for keywords, types, and identifiers
Function signatures and standard library functions
Generic containers from std.cll (Vector<T>, HashMap<K,V>, etc.)
Smart snippets for common patterns:
- Function definitions with tunnel
- Struct and enum definitions
- Control flow statements (if, while, for, foreach, switch)
- Templates
- Voided state guards

🔍 Error Highlighting

Syntax errors: Missing semicolons, invalid tunnel syntax
Type errors: Using continue in switch (warning)
Semantic errors: Moving const variables
Real-time diagnostic feedback as you type

📝 Code Completion

Keyword completion with documentation
Type suggestions for primitive and user-defined types
Function completions from standard library
Container templates pre-populated with type parameters

⚙️ Commands

Ctrl+Shift+B — Compile current C<< file
C<<: Check Syntax — Validate without compiling
C<<: Format Document — Auto-format code with proper indentation

🎨 Language Configuration

Auto-closing brackets and quotes
Smart indentation for control flow
Folding regions for code organization

Installation

From VS Code Extensions Marketplace

Open VS Code
Go to Extensions (Ctrl+Shift+X)
Search for "C<< Language Support"
Click Install

Manual Installation

# Clone or download the extension
cd cshift-vscode-extension
npm install
vsce package
code --install-extension cshift-language-1.1.0.vsix

Quick Start

Hello World

import std;

entry
{
    puts("Hello, C<< world!");
}

Function with Tunnel

def add(int32 a, int32 b)
{
    tunnel a + b -> int32 result;
}

entry
{
    reserve int32 sum = add(5, 7);
    printf("5 + 7 = %d\n", sum);
}

Generic Template

template<typename T>
struct Box
{
    T value;
}

entry
{
    Box<int32> box;
    box.value = 42;
}

Keyboard Shortcuts

Shortcut	Command
Ctrl+Space	Trigger autocomplete
Ctrl+Shift+B	Compile file
Alt+Shift+F	Format document
Ctrl+K Ctrl+0	Fold all
Ctrl+K Ctrl+J	Unfold all

Settings

Add to VS Code settings.json:

"[cshift]": {
    "editor.formatOnSave": true,
    "editor.wordBasedSuggestions": false,
    "editor.tabSize": 2,
    "editor.insertSpaces": true,
    "files.associations": {
        "*.cll": "cshift"
    }
}

Supported File Types

.cll — C<< source code

Documentation

Requirements

VS Code 1.70.0 or later
C<< compiler (cshift) for compilation features

Known Limitations

Template instantiation errors are not highlighted in-editor (compile to see full diagnostics)
Complex nested templates may not provide full autocomplete
Hover documentation is basic; see Syntax_spec.md for detailed reference

Changelog

Version 1.1.0

Complete rewrite with full IntelliSense and autocomplete
Multi-line comment support in syntax highlighting
Enhanced error detection and diagnostics
20+ code snippets for common patterns
Real-time compilation diagnostics
Support for all C<< 0.3 language features:
- Templates with template<typename T>
- Control flow: break and continue
- Generic containers from std.cll
- Improved VOP semantics visualization

Version 1.0.0

Initial release
Basic syntax highlighting
Keyword recognition

Contributing

Contributions are welcome! Please submit issues and pull requests to GitHub.

License

Apache License 2.0 — See LICENSE for details.

Acknowledgments

Built for the C<< (C-Shift) language project.

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