oo-ascii-tree
v1.105.0
Published
object-oriented ascii tree renderer
Downloads
996,259
Readme
oo-ascii-tree
Renders ASCII trees from an object-oriented object graph.
Features:
- Multiline text
- Multiple root nodes
Roadmap:
- Customization of tree formatting and indentation size
Install
$ npm i oo-ascii-tree
Basic Example
import { AsciiTree } from '../lib';
const tree = new AsciiTree('root');
tree.add(new AsciiTree('child1'));
tree.add(new AsciiTree('child2',
new AsciiTree('grandchild1'),
new AsciiTree('grandchild2')
));
tree.add(new AsciiTree('child3'));
tree.printTree();
Prints the following tree to stdout:
root
├── child1
├─┬ child2
│ ├── grandchild1
│ └── grandchild2
└── child3
Advanced Usage
You can also subclass AsciiTree
to encapsulate some model. The following
example declares a TitleNode
which formats a title with "====" underline and a
KeyValueNode
which formats text as key: value
:
class TitleNode extends AsciiTree {
constructor(title: string, ...children: AsciiTree[]) {
super([
title.toLocaleUpperCase(),
'='.repeat(title.length)
].join('\n'), ...children);
}
}
class KeyValueNode extends AsciiTree {
constructor(key: string, value: string) {
super(`${key}: ${value}`);
}
}
const tree = new AsciiTree();
tree.add(new TitleNode('props',
new KeyValueNode('shape', 'circle'),
new KeyValueNode('color', 'red'),
new KeyValueNode('background', 'blue')
));
tree.add(new TitleNode('dimensions',
new KeyValueNode('width', '30px'),
new KeyValueNode('height', '40px')
));
Will emit the following output:
PROPS
=====
├── shape: circle
├── color: red
└── background: blue
DIMENSIONS
==========
├── width: 30px
└── height: 40px
API
The AsciiTree
class represents a tree/node/subtree. Each node in the tree
includes text
and children
and can be printed to a Writable
via
printTree(stream)
.
new AsciiTree([text[, children...]])
Creates a new node with the specified text and optionally adds child nodes to it.
If text
is not specified, the children of this node will all be considered
roots (level 0) and the root node will get level -1. This allows modeling trees
with a single root or with multiple roots.
asciiTree.add(children...)
Adds one or more children to the node.
asciiTree.printTree([writableStream])
Emits an ASCII print out of the tree to the specified Writable
stream. The
default is process.stdout
.
asciiTree.toString()
Returns a string representation of the tree.
asciiTree.text
The node's text. If the text contains multiple line separated by \n
, new lines
will be aligned to the node's indentation.
asciiTree.children
Returns a copy of the array of children of this node. Use asciiTree.add
to add
children.
asciiTree.root
Returns true
if this is the root node.
asciiTree.last
Returns true
if this is the last child of a node.
asciiTree.level
Returns the node level. Root node(s) will have a level of 0.
If the root AsciiTree
has text, it's level will be 0 and its children will get
level 1. If the root AsciiTree
does not have text, it's level will be -1 and
all it's children will get level 0.
asciiTree.empty
Returns true
if this node does not have any children.
asciiTree.ancestors
Returns all the nodes that are ancestors of this node ordered from root to the direct parent.
License
Distributed under the Apache License, Version 2.0.