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'use strict';
/* Expose. */
module.exports = visit;
var is = require('unist-util-is');
/* Visit. */
function visit(tree, test, visitor, reverse) {
if (typeof test === 'function' && typeof visitor !== 'function') {
reverse = visitor;
visitor = test;
test = null;
}
one(tree);
/* Visit a single node. */
function one(node, index, parent) {
var result;
index = index || (parent ? 0 : null);
if (!test || node.type === test || is(test, node, index, parent || null)) {
result = visitor(node, index, parent || null);
}
if (node.children && result !== false) {
return all(node.children, node);
}
return result;
}
/* Visit children in `parent`. */
function all(children, parent) {
var step = reverse ? -1 : 1;
var max = children.length;
var min = -1;
var index = (reverse ? max : min) + step;
var child;
while (index > min && index < max) {
child = children[index];
if (child && one(child, index, parent) === false) {
return false;
}
index += step;
}
return true;
}
}
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