nv-cli-ifelse/chain.js

cli,to write many if else

const {add_repr} = require("nv-facutil-basic");

const Branch = require("./branch");
const Forest  = require("nv-data-tree-csp-forest");

function _repr(that) {
   let sedfs = that.$sedfs_.slice(1);
   sedfs.pop();
   let ary = sedfs.map(
       r=>{
           if(r[1]==='open') {
               let s = (r[0].open_str_)
               if(r[0].in_path) {
                   s = s.replace("<","[");
                   s = s.replace(">","]");
               } else {}
               return(s)
           } else {
               return(r[0].close_str_)
           }
       }
   )
   let s = "\n" + ary.join("\n\n")
   s = s.replace(/[\n]{2,}/g,"\n\n")
   return(s)
}

add_repr(Branch,_repr);


////

function build(args,size=10000,always_with_else=false) {
    if(args[0]==='else') {args.unshift('if')}
    let forest = new Forest(size)
    let rt = forest.node(Branch);
    let p = rt;
    for(let each of args) {
        if(each === 'if') {
            let oldp = p;
            p = p.$append_child();                      //ifnd
            p.in_path = true;
            if(always_with_else) {
                 oldp.$append_child();
            }                                          //elnd
        } else if(each === 'else') {
            p.$append_child();                 //ifnd
            p = p.$append_child();             //elnd
            p.in_path = true;
        } else {
            //do nothing
        }
    }
    return(rt)
}


module.exports = build;