55 lines
1.5 KiB
JavaScript
55 lines
1.5 KiB
JavaScript
|
"use strict";
|
||
|
|
|
||
|
|
Object.defineProperty(exports, "__esModule", {
|
||
|
|
value: true
|
||
|
|
});
|
||
|
|
exports.findExpandedKeys = findExpandedKeys;
|
||
|
|
exports.getExpandRange = getExpandRange;
|
||
|
|
function findExpandedKeys() {
|
||
|
|
var prev = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : [];
|
||
|
|
var next = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : [];
|
||
|
|
var prevLen = prev.length;
|
||
|
|
var nextLen = next.length;
|
||
|
|
if (Math.abs(prevLen - nextLen) !== 1) {
|
||
|
|
return {
|
||
|
|
add: false,
|
||
|
|
key: null
|
||
|
|
};
|
||
|
|
}
|
||
|
|
function find(shorter, longer) {
|
||
|
|
var cache = new Map();
|
||
|
|
shorter.forEach(function (key) {
|
||
|
|
cache.set(key, true);
|
||
|
|
});
|
||
|
|
var keys = longer.filter(function (key) {
|
||
|
|
return !cache.has(key);
|
||
|
|
});
|
||
|
|
return keys.length === 1 ? keys[0] : null;
|
||
|
|
}
|
||
|
|
if (prevLen < nextLen) {
|
||
|
|
return {
|
||
|
|
add: true,
|
||
|
|
key: find(prev, next)
|
||
|
|
};
|
||
|
|
}
|
||
|
|
return {
|
||
|
|
add: false,
|
||
|
|
key: find(next, prev)
|
||
|
|
};
|
||
|
|
}
|
||
|
|
function getExpandRange(shorter, longer, key) {
|
||
|
|
var shorterStartIndex = shorter.findIndex(function (data) {
|
||
|
|
return data.key === key;
|
||
|
|
});
|
||
|
|
var shorterEndNode = shorter[shorterStartIndex + 1];
|
||
|
|
var longerStartIndex = longer.findIndex(function (data) {
|
||
|
|
return data.key === key;
|
||
|
|
});
|
||
|
|
if (shorterEndNode) {
|
||
|
|
var longerEndIndex = longer.findIndex(function (data) {
|
||
|
|
return data.key === shorterEndNode.key;
|
||
|
|
});
|
||
|
|
return longer.slice(longerStartIndex + 1, longerEndIndex);
|
||
|
|
}
|
||
|
|
return longer.slice(longerStartIndex + 1);
|
||
|
|
}
|