轉換樹狀csv 為 d3js json 格式

tree 長像：

匯入用的 csv:

a,,
,b,
,,d
,,,f
,,,,g
,c,
,,d
,e,
,f,

轉換 csv 為 json tree:

let csv_string = $('#treechart-tab-csv-textarea').val();
const lines = csv_string.split(/\r?\n/);
for(let i=0; i<lines.length; i++) {
    const line = lines[i];
    if(line.length) {
        let title = "";
        let lv = -1;
        const columns = line.split(/,/);
        for(let j=0; j<columns.length; j++) {
            const column = columns[j];
            if(column.length) {
                title = column;
                lv = j;
                break;
            }
        }
        if(title.length) {
			let current_node = treechart_new_node(title);
			
			// trim not used sub folder.
			if(path_stock.length) {
				path_stock = path_stock.slice(0,lv);
			}
			
			// force to push current node to stock.
			path_stock.push(current_node);
			
			if(lv==0) {
				if(json_obj.length==0) {
                    json_obj.push(current_node);
                }
			} else {
				if(json_obj.length==1) {
					let last_node = path_stock[(lv-1)];
					last_node.children.push(current_node);
				}
			}
        }
    }
}

轉換 json 為 csv:

主程式：

let json_obj = JSON.parse(jstree_node_json);
if(json_obj.length==1) {
	jstree_node_json = json_obj[0].text + "\n";
	const travel_result = treechart_travel_json_node(json_obj[0].children, ",")
	jstree_node_json += travel_result;
}

副程式：

function treechart_travel_json_node(children, prefix) {
	let ret = "";
	if(children.length) {
		for(let i=0; i<children.length; i++) {
			const node = children[i];
			ret = ret + prefix + node.text + "\n";
			if(node.children.length) {
				ret = ret + treechart_travel_json_node(node.children, prefix + ",");
			}
		}
	}
	return ret;
}