I2P-Style Pseudocode

Syntax highlighting for I2P-style pseudocode in Visual Studio Code.

Designed for introductory programming students, this extension helps you move from algorithm → flowchart → pseudocode → code with clear, readable structure and consistent formatting.

✨ Features

• Custom syntax highlighting for I2P-style pseudocode
• Readable keyword emphasis (e.g., START, IF, WHILE, CALL)
• Clear distinction between:
  • Variables (lower_case)
  • Constants (UPPER_CASE)
  • Functions and procedures
• Support for core constructs:
  • Input / Output (GET, PUT)
  • Assignment (LET)
  • Conditionals (IF, ELSEIF, ELSE, ENDIF)
  • Loops (WHILE, FOR, FOREACH)
• Inline and block comments, including tagged comments:
  • TODO, FIXME, NOTE, etc.
• Placeholders / metavariables using <...> for instructional scaffolding
• Consistent highlighting across file extensions:
  • .i2p, .pseudo, .pseudocode, .psc

📸 Example

Syntax highlighting in action:

This example demonstrates:

• Program structure (START / END)
• Input/output operations
• Control flow (conditionals and loops)
• Comments and placeholders

A full test file is available in the repo: tests\test.i2p)

🌐 Works Everywhere

This extension works in:

• Desktop VS Code
• VS Code for EDU
• vscode.dev
• github.dev

Perfect for both local development and browser-based learning environments.

🚀 Getting Started

1. Install the extension from the VS Code Marketplace
2. Open or create a pseudocode file:
3. Start writing using I2P conventions:

   START example
   
      GET user_name
      LET message = "Hello, " & user_name
      PUT message
   
   END example
   

🎯 Who Is This For?

• Students in introductory programming (CS1 / I2P) courses
• Instructors teaching algorithm design and pseudocode
• Anyone who wants a structured bridge from logic → code

🧠 Why I2P Pseudocode?

I2P-style pseudocode is designed to:

• Reduce cognitive load for beginners
• Reinforce good programming habits early
• Provide a consistent transition to Python and other languages
• Align with structured design practices used in real-world development

🏫 About I2P-Hub

I2P-Hub is a collection of teaching and learning resources created by programming instructors to support student success in introductory courses.

Our goal is to make early programming concepts:

• Clear
• Consistent
• Practical

🔒 Data and Telemetry

This extension does not collect or transmit any data.

You can review the source code or build your own VSIX file from the GitHub repository, if desired.

📜 License

MIT License © 2026 I2P-Hub

Acknowledgements

• Martin Ring – TextMate grammar schema
• hanzhi713's ibcs-pseudocode – inspiration
• ChatGPT – regex refinement support