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"use strict";
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.traverse2 = traverse2;
exports.mergeVisitors = mergeVisitors;
exports.REMOVE = exports.SKIP = void 0;
function t() {
const data = _interopRequireWildcard(require("@babel/types"));
t = function () {
return data;
};
return data;
}
var _explode = _interopRequireDefault(require("./explode.js"));
function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
function _getRequireWildcardCache() { if (typeof WeakMap !== "function") return null; var cache = new WeakMap(); _getRequireWildcardCache = function () { return cache; }; return cache; }
function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } if (obj === null || typeof obj !== "object" && typeof obj !== "function") { return { default: obj }; } var cache = _getRequireWildcardCache(); if (cache && cache.has(obj)) { return cache.get(obj); } var newObj = {}; var hasPropertyDescriptor = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) { var desc = hasPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : null; if (desc && (desc.get || desc.set)) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } newObj.default = obj; if (cache) { cache.set(obj, newObj); } return newObj; }
const SKIP = Symbol('traverse.SKIP');
exports.SKIP = SKIP;
const REMOVE = Symbol('traverse.REMOVE');
exports.REMOVE = REMOVE;
function traverse2(node, visitors, state) {
let revisit = [];
traverseWalk((0, _explode.default)(visitors), [], revisit, state, node);
for (let fn of revisit) {
fn();
}
}
function traverseWalk(visitors, ancestors, revisit, state, node) {
if (!node || visitors.shouldSkip && visitors.shouldSkip(node) === true) {
return;
}
let isNew = node != ancestors[ancestors.length - 1];
if (isNew) ancestors.push(node);
const {
enter,
exit
} = visitors[node.type] || {};
if (enter) {
for (let visitor of enter) {
let res = visitor(node, state, ancestors);
if (res != null) {
if (isNew) ancestors.pop();
return res;
}
}
}
for (let key of t().VISITOR_KEYS[node.type] || []) {
// $FlowFixMe
let subNode = node[key];
if (Array.isArray(subNode)) {
let revisitDiff = 0;
for (let i = 0; i < subNode.length; i++) {
let res = traverseWalk(visitors, ancestors, revisit, state, subNode[i]);
if (res === REMOVE) {
subNode.splice(i, 1);
i--;
} else if (res !== SKIP && res != null) {
if (typeof res === 'function') {
revisit.push(() => {
let index = i + revisitDiff;
let r = replaceArray(subNode, index, res());
revisitDiff += r - index;
});
} else {
i = replaceArray(subNode, i, res);
}
}
}
} else {
let res = traverseWalk(visitors, ancestors, revisit, state, subNode);
if (res === REMOVE) {
if (isNew) ancestors.pop();
return REMOVE;
} else if (res !== SKIP && res != null) {
if (typeof res === 'function') {
revisit.push(() => {
let n = res();
if (n != null) {
// $FlowFixMe
node[key] = n;
}
});
} else {
// $FlowFixMe
node[key] = res;
}
}
}
}
if (exit) {
for (let visitor of exit) {
let res = visitor(node, state, ancestors);
if (res != null) {
if (isNew) ancestors.pop();
return res;
}
}
}
if (isNew) ancestors.pop();
}
function replaceArray(subNode, i, res) {
if (res === REMOVE) {
subNode.splice(i, 1);
i--;
} else if (Array.isArray(res)) {
subNode.splice(i, 1, ...res);
if (res.length === 0) {
i--;
} else if (res.length > 1) {
i += res.length - 1;
}
} else if (res != null) {
// $FlowFixMe
subNode[i] = res;
}
return i;
}
function mergeVisitors(a, b) {
let res = {}; // $FlowFixMe
res._exploded = true;
for (let visitor of [a, b]) {
let {
shouldSkip,
...exploded
} = (0, _explode.default)(visitor);
for (let type in exploded) {
if (!res[type]) {
res[type] = {};
}
if (exploded[type].enter) {
res[type].enter = [...(res[type].enter || []), ...exploded[type].enter];
}
if (exploded[type].exit) {
res[type].exit = [...(res[type].exit || []), ...exploded[type].exit];
}
}
if (shouldSkip) {
if (res.shouldSkip) {
let prev = res.shouldSkip;
res.shouldSkip = node => prev(node) || shouldSkip(node);
} else {
res.shouldSkip = shouldSkip;
}
}
}
return res;
}