Diago

A diagoago diagram language compiler written in MoonBit.

Overview

Diago compiles diagoago diagram source files to SVG. It implements the codiago diago language features including objects, edges, labels, shapes, and styling.

Installation

moon build

Usage

# Compile diagoago to SVG (output to stdout)
moon run cmd/main -- diagram.d2

# Compile diagoago to SVG file
moon run cmd/main -- diagram.d2 output.svg

Example

Create a file example.d2:

server: Web Server
database: Database {
  shape: cylinder
}
cache: Cache {
  shape: oval
}

server -> database: queries
server -> cache: reads
cache -> database: fallback

Compile it:

moon run cmd/main -- example.d2 example.svg

Architecture

The compiler pipeline:

diagoago Source → Lexer → Parser → AST → IR → Graph → Layout → SVG

Module	Description
lexer	Tokenizes diagoago source into tokens
parser	Parses tokens into AST
ast	Abstract syntax tree definitions
ir	Intermediate representation
graph	Graph data structures (objects, edges)
layout	Positions objects and routes edges
svg	Renders graph to SVG

Supported Features

• Objects with labels
• Nested objects (containers)
• Edges with labels and arrows (->, <-, <->, --)
• Shapes: rectangle, circle, oval, cylinder, diamond, hexagon
• Style properties: fill, stroke, stroke-width, border-radius
• Edge chains: a -> b -> c

Tests

moon test        # Run all tests
moon test -v     # Verbose output

License

MIT