sexpr { mae.earth/pkg/sexpr }

Symbolic-expression parser in golang.

Install with

go get mae.earth/pkg/sexpr

root,_ := ParseString("(+ 1 2)",nil)
out,_ := OutputString(root)
fmt.Printf("%s",out)

(+ 1 2)

package main

import (
    "fmt"
    "mae.earth/pkg/sexpr"
    "mae.earth/pkg/sexpr/cell"
)

type value string

func (v value) String() string {
    return fmt.Sprintf("%s", string(v))
}

func main() {

    c := cell.New(cell.List(value("+"), value("1"), value("2")),nil)

    str,err := sexpr.OutputString(c)
    if err != nil {
        panic(err)
    }

    root,err := sexpr.ParseString(str,nil)
    if err != nil {
        panic(err)
    }

    if root.IsList() {
        list := root.List()
        fmt.Printf("%d atoms in the list\n",cell.Count(list))

        head := cell.First(list)
        fmt.Printf("operation %s\n",head.Value())
    
        rest := cell.Rest(list)

        for {
            if rest == nil {
                break
            }
            fmt.Printf("\t%s\n",rest.Value())

            rest = rest.Next()  
        }
        
    }
}

3 atoms in the list
operation +
    1
    2