co

𝐖𝐡𝐚𝐭 𝐢𝐬 𝕘𝕠-𝕔𝕠

𝙏𝙝𝙚 𝙊𝙡𝙙 𝙉𝙚𝙬 𝙏𝙝𝙞𝙣𝙜

golang co-routine is a source to source compiler which rewrites trival yield statements to monadic style code.

Inspired by wind-js.

Quick Start

Create source files ending with _co.go / _co_test.go.

Build tag //go:build co required.

Then go generate -tags co ./... (or run by IDE whatever).

And it is a good idea to switch custom build tag to co when working in goland or vscode, so IDE will be happy to index and check your code.

//go:build co

//go:generate go install github.com/goghcrow/go-co/cmd/cogen
//go:generate cogen

package main

import (
	. "github.com/goghcrow/go-co"
)

func Fibonacci() Iter[int] {
  a, b := 1, 1
  for {
    Yield(b)
    a, b = b, a+b
  }
}

func main() {
	for n := range Fibonacci() {
		if n > 1000 {
			println(n)
			break
		}
	}
}

Example

• Simple
• Tree
• Linq
• MicroThread
• Lexer
• Sched1
• Sched2

API

go get github.com/goghcrow/go-co@latest

package main

import (
    "github.com/goghcrow/go-co/rewriter"
    "github.com/goghcrow/go-loader"
)

func main() {
    rewriter.Compile(
        "./src",
        "./out",
        loader.WithLoadTest(),
    )
}

Control Flow Support

Rewrite control flow to monadic func invoking.

• IfStmt
• SwitchStmt
  • Fallthrough
• TypeSwitchStmt
• ForStmt
• RangeStmt
  • string
  • slice
  • map
  • array
  • integer
  • channel
  • range func
• BlockStmt
• Break / Continue
  • Non-Label
  • Label
• Goto
• SelectStmt
• DeferStmt