polymer-bundler
Version:
Process Web Components into one output file
98 lines • 3.31 kB
JavaScript
;
/**
* @license
* Copyright (c) 2018 The Polymer Project Authors. All rights reserved.
* This code may only be used under the BSD style license found at
* http://polymer.github.io/LICENSE.txt
* The complete set of authors may be found at
* http://polymer.github.io/AUTHORS.txt
* The complete set of contributors may be found at
* http://polymer.github.io/CONTRIBUTORS.txt
* Code distributed by Google as part of the polymer project is also
* subject to an additional IP rights grant found at
* http://polymer.github.io/PATENTS.txt
*/
Object.defineProperty(exports, "__esModule", { value: true });
/**
* Simple utility function used to find an item in a set with a predicate
* function. Analagous to Array.find(), without requiring converting the set
* an Array.
*/
function find(items, predicate) {
for (const item of items) {
if (predicate(item)) {
return item;
}
}
}
exports.find = find;
/**
* Converts string like `abc-xyz__omg` to `abcXyzOmg`.
*/
function camelCase(text) {
return text.replace(/([a-z0-9])[^a-z0-9]+([a-z])/gi, (m) => m[0] + m[2].toUpperCase());
}
exports.camelCase = camelCase;
/**
* Returns a set of unique/distinct values returned by calling the given
* function on each item.
*/
function uniq(items, map) {
const results = new Set();
for (const item of items) {
results.add(map(item));
}
return results;
}
exports.uniq = uniq;
/**
* Returns a map of arrays of items, with keys generated by the keygen function.
*/
function partitionMap(items, keygen) {
const map = new Map();
for (const item of items) {
const key = keygen(item);
const partition = map.get(key) || [];
if (!map.has(key)) {
map.set(key, partition);
}
partition.push(item);
}
return map;
}
exports.partitionMap = partitionMap;
/**
* Performs an in-place rewrite of a target object's properties from a given
* replacement node. This is useful because there are some transformations
* of ASTs which simply require replacing a node, but it is not always
* convenient to obtain the specific parent node property to which a node may be
* attached out of many possible configurations.
*/
function rewriteObject(target, replacement) {
// Strip all properties from target
for (const key of Object.getOwnPropertyNames(target)) {
if (!replacement.hasOwnProperty(key)) {
delete target[key];
}
}
// Transfer remaining properties from replacement
for (const key of Object.getOwnPropertyNames(replacement)) {
target[key] = replacement[key];
}
}
exports.rewriteObject = rewriteObject;
/**
* Generate a valid identifier name which is unique (i.e. does not appear
* anywhere in the source text provided). Do this by trying the provided
* `value` and then successively trying the value with an incrementing suffix
* counter until one is found that appears nowhere in the source.
*/
function generateUniqueIdentifierName(value, source) {
let counter = 0, uniqueValue = value;
while (source.includes(uniqueValue)) {
uniqueValue = `${value}$${++counter}`;
}
return uniqueValue;
}
exports.generateUniqueIdentifierName = generateUniqueIdentifierName;
//# sourceMappingURL=utils.js.map