Logo Interpreter & Debugger for VSCode

Standalone VSCode extension with interpreter and debugger for the Logo programming language.

Features

• Logo Language Support: Implements the Logo interpreter directly in the extension
• Code Suggestions: Auto-completion for Logo commands and procedures
• Live Preview: Preview panel renders Logo graphics in real-time as you save your code.
• Save images: Right-click on the preview panel & select "Save as PNG".
• Debugging: Set breakpoints, step through code, inspect variables
• Syntax Highlighting: Logo language syntax highlighting
• Basic Code Formatter: Indentation and spacing for better readability
• Syntax Checking: Basic syntax error detection
• Variable Inspection: View turtle state (position, angle, pen status) and program variables

Supported Logo Commands

Turtle Movement

• FD / FORWARD - Move forward
• BK / BACK / BACKWARD - Move backward
• RT / RIGHT - Turn right
• LT / LEFT - Turn left
• PU / PENUP - Lift pen
• PD / PENDOWN - Put pen down

Drawing

• CS / CLEARSCREEN - Clear screen and reset turtle
• CLEAR - Clear the drawing without resetting turtle position
• SETPENCOLOR / SETPC - Set pen color
• HIDETURTLE / HT - Hide turtle cursor
• SHOWTURTLE / ST - Show turtle cursor
• PU / PENUP - Lift pen
• PD / PENDOWN - Put pen down

Control Structures

• REPEAT n [commands] - Repeat commands n times
• IF condition [commands] - Conditional execution
• IFELSE condition [true-commands] [false-commands] - Conditional execution with two branches
• LOAD "path.logo / LOAD :filename - Load and execute another Logo file
  • Loaded files are executed immediately
  • Procedures defined in loaded files become available to the current program
  • Relative paths are resolved from the file containing the LOAD command
  • Repeated LOAD commands re-execute the target file
• TO name :param1 :param2 ... END - Define procedures

Variables and Expressions

• :variable - Variable reference
• :var = expression / MAKE "var expression - Variable assignment
• RANDOM n - Random integer in [0, n), or 0 when n <= 0
• INT expression - Integer part of a number, truncated toward zero
• REMAINDER a b - Remainder using truncation toward zero, matching a - INT(a / b) * b
• Arithmetic operators: +, -, *, /
• Comparison operators: =, <, >
• Example: MAKE "A (RANDOM 10), PRINT INT (132 / 10), or PRINT REMAINDER 132 10

Additional Commands

• ARC - Move along an arc
• PRINT / PR - Print a value to the output

Usage

Preview

1. Open a .logo file in VSCode
2. Press Ctrl+Shift+V or click the preview icon in the editor title bar
3. The preview panel will open, displaying the Logo graphics.
4. The preview automatically updates whenever you save the file.

Run/Debug

1. Open a .logo file in VSCode
2. Place breakpoints if needed
3. Press Ctrl+F5 to run/debug the program

Examples

You can find example programs here