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6.5 KiB
JavaScript

"use strict";
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.explode = explode;
exports.isExplodedVisitor = isExplodedVisitor;
exports.merge = merge;
exports.verify = verify;
var virtualTypes = require("./path/lib/virtual-types.js");
var _t = require("@babel/types");
const {
DEPRECATED_KEYS,
DEPRECATED_ALIASES,
FLIPPED_ALIAS_KEYS,
TYPES,
__internal__deprecationWarning: deprecationWarning
} = _t;
function isVirtualType(type) {
return type in virtualTypes;
}
function isExplodedVisitor(visitor) {
return visitor == null ? void 0 : visitor._exploded;
}
function explode(visitor) {
if (isExplodedVisitor(visitor)) return visitor;
visitor._exploded = true;
for (const nodeType of Object.keys(visitor)) {
if (shouldIgnoreKey(nodeType)) continue;
const parts = nodeType.split("|");
if (parts.length === 1) continue;
const fns = visitor[nodeType];
delete visitor[nodeType];
for (const part of parts) {
visitor[part] = fns;
}
}
verify(visitor);
delete visitor.__esModule;
ensureEntranceObjects(visitor);
ensureCallbackArrays(visitor);
for (const nodeType of Object.keys(visitor)) {
if (shouldIgnoreKey(nodeType)) continue;
if (!isVirtualType(nodeType)) continue;
const fns = visitor[nodeType];
for (const type of Object.keys(fns)) {
fns[type] = wrapCheck(nodeType, fns[type]);
}
delete visitor[nodeType];
const types = virtualTypes[nodeType];
if (types !== null) {
for (const type of types) {
if (visitor[type]) {
mergePair(visitor[type], fns);
} else {
visitor[type] = fns;
}
}
} else {
mergePair(visitor, fns);
}
}
for (const nodeType of Object.keys(visitor)) {
if (shouldIgnoreKey(nodeType)) continue;
let aliases = FLIPPED_ALIAS_KEYS[nodeType];
if (nodeType in DEPRECATED_KEYS) {
const deprecatedKey = DEPRECATED_KEYS[nodeType];
deprecationWarning(nodeType, deprecatedKey, "Visitor ");
aliases = [deprecatedKey];
} else if (nodeType in DEPRECATED_ALIASES) {
const deprecatedAlias = DEPRECATED_ALIASES[nodeType];
deprecationWarning(nodeType, deprecatedAlias, "Visitor ");
aliases = FLIPPED_ALIAS_KEYS[deprecatedAlias];
}
if (!aliases) continue;
const fns = visitor[nodeType];
delete visitor[nodeType];
for (const alias of aliases) {
const existing = visitor[alias];
if (existing) {
mergePair(existing, fns);
} else {
visitor[alias] = Object.assign({}, fns);
}
}
}
for (const nodeType of Object.keys(visitor)) {
if (shouldIgnoreKey(nodeType)) continue;
ensureCallbackArrays(visitor[nodeType]);
}
return visitor;
}
function verify(visitor) {
if (visitor._verified) return;
if (typeof visitor === "function") {
throw new Error("You passed `traverse()` a function when it expected a visitor object, " + "are you sure you didn't mean `{ enter: Function }`?");
}
for (const nodeType of Object.keys(visitor)) {
if (nodeType === "enter" || nodeType === "exit") {
validateVisitorMethods(nodeType, visitor[nodeType]);
}
if (shouldIgnoreKey(nodeType)) continue;
if (TYPES.indexOf(nodeType) < 0) {
throw new Error(`You gave us a visitor for the node type ${nodeType} but it's not a valid type`);
}
const visitors = visitor[nodeType];
if (typeof visitors === "object") {
for (const visitorKey of Object.keys(visitors)) {
if (visitorKey === "enter" || visitorKey === "exit") {
validateVisitorMethods(`${nodeType}.${visitorKey}`, visitors[visitorKey]);
} else {
throw new Error("You passed `traverse()` a visitor object with the property " + `${nodeType} that has the invalid property ${visitorKey}`);
}
}
}
}
visitor._verified = true;
}
function validateVisitorMethods(path, val) {
const fns = [].concat(val);
for (const fn of fns) {
if (typeof fn !== "function") {
throw new TypeError(`Non-function found defined in ${path} with type ${typeof fn}`);
}
}
}
function merge(visitors, states = [], wrapper) {
const mergedVisitor = {};
for (let i = 0; i < visitors.length; i++) {
const visitor = explode(visitors[i]);
const state = states[i];
let topVisitor = visitor;
if (state || wrapper) {
topVisitor = wrapWithStateOrWrapper(topVisitor, state, wrapper);
}
mergePair(mergedVisitor, topVisitor);
for (const key of Object.keys(visitor)) {
if (shouldIgnoreKey(key)) continue;
let typeVisitor = visitor[key];
if (state || wrapper) {
typeVisitor = wrapWithStateOrWrapper(typeVisitor, state, wrapper);
}
const nodeVisitor = mergedVisitor[key] || (mergedVisitor[key] = {});
mergePair(nodeVisitor, typeVisitor);
}
}
;
return mergedVisitor;
}
function wrapWithStateOrWrapper(oldVisitor, state, wrapper) {
const newVisitor = {};
for (const phase of ["enter", "exit"]) {
let fns = oldVisitor[phase];
if (!Array.isArray(fns)) continue;
fns = fns.map(function (fn) {
let newFn = fn;
if (state) {
newFn = function (path) {
fn.call(state, path, state);
};
}
if (wrapper) {
newFn = wrapper(state == null ? void 0 : state.key, phase, newFn);
}
if (newFn !== fn) {
newFn.toString = () => fn.toString();
}
return newFn;
});
newVisitor[phase] = fns;
}
return newVisitor;
}
function ensureEntranceObjects(obj) {
for (const key of Object.keys(obj)) {
if (shouldIgnoreKey(key)) continue;
const fns = obj[key];
if (typeof fns === "function") {
obj[key] = {
enter: fns
};
}
}
}
function ensureCallbackArrays(obj) {
if (obj.enter && !Array.isArray(obj.enter)) obj.enter = [obj.enter];
if (obj.exit && !Array.isArray(obj.exit)) obj.exit = [obj.exit];
}
function wrapCheck(nodeType, fn) {
const newFn = function (path) {
if (path[`is${nodeType}`]()) {
return fn.apply(this, arguments);
}
};
newFn.toString = () => fn.toString();
return newFn;
}
function shouldIgnoreKey(key) {
if (key[0] === "_") return true;
if (key === "enter" || key === "exit" || key === "shouldSkip") return true;
if (key === "denylist" || key === "noScope" || key === "skipKeys") {
return true;
}
{
if (key === "blacklist") {
return true;
}
}
return false;
}
function mergePair(dest, src) {
for (const phase of ["enter", "exit"]) {
if (!src[phase]) continue;
dest[phase] = [].concat(dest[phase] || [], src[phase]);
}
}
//# sourceMappingURL=visitors.js.map