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'use strict';
const { expect } = require('chai');
const { visit, detachNodeFromParent } = require('./xast.js');
const getAst = () => {
const ast = {
type: 'root',
children: [
{
type: 'element',
name: 'g',
attributes: {},
children: [
{
type: 'element',
name: 'rect',
attributes: {},
children: [],
},
{
type: 'element',
name: 'circle',
attributes: {},
children: [],
},
],
},
{
type: 'element',
name: 'ellipse',
attributes: {},
children: [],
},
],
};
ast.children[0].parentNode = ast;
ast.children[0].children[0].parentNode = ast.children[0];
ast.children[0].children[1].parentNode = ast.children[0];
ast.children[1].parentNode = ast;
return ast;
};
describe('xast', () => {
it('enter into nodes', () => {
const root = getAst();
const entered = [];
visit(root, {
root: {
enter: (node) => {
entered.push(node.type);
},
},
element: {
enter: (node) => {
entered.push(`${node.type}:${node.name}`);
},
},
});
expect(entered).to.deep.equal([
'root',
'element:g',
'element:rect',
'element:circle',
'element:ellipse',
]);
});
it('exit from nodes', () => {
const root = getAst();
const exited = [];
visit(root, {
root: {
exit: (node) => {
exited.push(node.type);
},
},
element: {
exit: (node) => {
exited.push(`${node.type}:${node.name}`);
},
},
});
expect(exited).to.deep.equal([
'element:rect',
'element:circle',
'element:g',
'element:ellipse',
'root',
]);
});
it('skip entering children if node is detached', () => {
const root = getAst();
const entered = [];
visit(root, {
element: {
enter: (node) => {
entered.push(node.name);
if (node.name === 'g') {
detachNodeFromParent(node);
}
},
},
});
expect(entered).to.deep.equal(['g', 'ellipse']);
});
});