Sha256: 6f27d3b781a53abf36165a0aaaad4fdca82f8aea523abf1c977feb63998c1502
Contents?: true
Size: 1.12 KB
Versions: 10
Compression:
Stored size: 1.12 KB
Contents
export function walk(ast, { enter, leave }) {
visit(ast, null, enter, leave);
}
let shouldSkip = false;
const context = { skip: () => shouldSkip = true };
export const childKeys = {};
const toString = Object.prototype.toString;
function isArray(thing) {
return toString.call(thing) === '[object Array]';
}
function visit(node, parent, enter, leave, prop, index) {
if (!node) return;
if (enter) {
const _shouldSkip = shouldSkip;
shouldSkip = false;
enter.call(context, node, parent, prop, index);
const skipped = shouldSkip;
shouldSkip = _shouldSkip;
if (skipped) return;
}
const keys = node.type && childKeys[node.type] || (
childKeys[node.type] = Object.keys(node).filter(key => typeof node[key] === 'object')
);
for (let i = 0; i < keys.length; i += 1) {
const key = keys[i];
const value = node[key];
if (isArray(value)) {
for (let j = 0; j < value.length; j += 1) {
value[j] && value[j].type && visit(value[j], node, enter, leave, key, j);
}
}
else if (value && value.type) {
visit(value, node, enter, leave, key, null);
}
}
if (leave) {
leave(node, parent, prop, index);
}
}
Version data entries
10 entries across 10 versions & 1 rubygems