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reqyire.js
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reqyire.js
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const DEFAULT_CACHE_SIZE = 265;
const PROXY_SUPPORT = (typeof Proxy != "undefined");
var path = require("path");
var fs = require("fs");
var stackTrace = require("stack-trace");
var exec = require("child_process").execSync;
PROXY_SUPPORT && require("harmony-reflect");
var moduleSearch;
var pathRegex = /^(\/|\.\/|\.\.\/)/;
function reqyire(moduleName){
if(pathRegex.test(moduleName)){
return fileSearch(moduleName);
}else{
try{
return require(moduleName);
}catch(e){
if(!moduleSearch){
var localModules = Object.keys(JSON.parse(executeCommand("npm ls -json")).dependencies || {});
var globalModules = Object.keys(JSON.parse(executeCommand("npm ls -g -json")).dependencies || {});
var builtinModules = require("builtin-modules");
var modules = localModules.concat(globalModules).concat(builtinModules);
moduleSearch = cachedSearch(modules);
}
return require(moduleSearch(moduleName));
}
}
}
function wrap(obj){
if(PROXY_SUPPORT){
return fuzzy(obj);
}else{
return obj;
}
}
if(PROXY_SUPPORT){
reqyire.wrap = fuzzy;
}
module.exports = wrap(reqyire);
function fileSearch(moduleName){
var callerName = stackTrace.get()[3].getFileName();
var callerFolder = path.dirname(callerName);
var resolvedName = path.resolve(callerFolder, moduleName);
try{
return require(resolvedName);
}catch(e){
var pathFragments = resolvedName.split(path.sep);
var i = pathFragments.length - 1;
var partialPath;
while(i > 0){
partialPath = pathFragments.slice(0, i).join(path.sep);
if(access(partialPath)){
break;
}else{
i--;
}
}
pathFragments = pathFragments.slice(i);
var fragment, names, correct;
while(pathFragments.length){
fragment = pathFragments.shift();
if(pathFragments.length){
names = getFolderNames(partialPath);
}else{
names = getFileNames(partialPath);
}
correct = fuzzySearch(names, fragment);
partialPath = path.join(partialPath, correct);
}
return require(partialPath);
}
}
function access(path){
try{
fs.accessSync(path);
return true;
}catch(e){
return false;
}
}
function getFileNames(dir){
return fs.readdirSync(dir).filter(function(name){
return fs.statSync(path.join(dir, name)).isFile();
});
}
function getFolderNames(dir){
return fs.readdirSync(dir).filter(function(name){
return fs.statSync(path.join(dir, name)).isDirectory();
});
}
function executeCommand(command){
var result;
try{
result = exec(command, {stdio: ["pipe", "pipe", "ignore"]}) + "";
}catch(e){
result = e.stdout + "";
}
return result;
}
function fuzzy(obj){
if(typeof obj != "object" && typeof obj != "function"){
return obj;
}
return new Proxy(obj, {
get: function(obj, key){
if(key in obj){
return obj[key];
}
var keys = [];
var p = obj;
do{
keys = keys.concat(Object.getOwnPropertyNames(p));
}while (p = Object.getPrototypeOf(p));
return fuzzy(obj[fuzzySearch(keys, key)]);
},
apply: function(obj, thisArg, argsList){
return fuzzy(obj.apply(thisArg, argsList));
}
})
}
//Свой велосипед для мемоизации. Так захотелось.
function Cache(size){
var keys = [], values = [];
this.add = function(key, value){
var i = keys.indexOf(key);
if(i > -1){
keys = keys.concat(keys.splice(i, 1));
values.splice(i, 1);
values.push(value);
}else{
keys.push(key);
values.push(value);
if(keys.length > size){
keys.shift();
values.shift();
}
}
}
this.get = function(key){
var i = keys.indexOf(key);
if(i > -1){
keys = keys.concat(keys.splice(i, 1));
values = values.concat(values.splice(i, 1));
return values[values.length];
}else{
return null;
}
}
}
function cachedFunction(fn, size){
var cache = new Cache(size);
return function(key){
var value = cache.get(key);
if(!value){
value = fn(key);
cache.add(key, value)
}
return value;
}
}
//Слегка модифицированный алгоритм Вагнера-Фишера
function cachedSearch(arr){
return cachedFunction(fuzzySearch.bind(null, arr), DEFAULT_CACHE_SIZE);
}
function fuzzySearch(arr, key){
var current, best = 0, bestResult = "";
for(var i = 0; i < arr.length; i++){
current = distanceLessThan(arr[i], key, best);
if(current > -1){
best = current;
bestResult = arr[i];
}
}
return bestResult;
}
function distanceLessThan(str1, str2, n){
var distances = [];
var distancesNext = [];
var i, j, flag = true;
for(j = 0; j <= str1.length; j++){
distances[j] = j;
}
for(i = 1; i <= str2.length; i++){
flag = false;
distancesNext[0] = i;
flag = flag || (distancesNext[0] < n);
for(j = 1; j <= str1.length; j++){
distancesNext[j] = Math.min(
distances[j] + 1,
distancesNext[j - 1] + 1,
distances[j - 1] + ((str2[i - 1] == str1[j - 1]) ? 0 : 1)
);
flag = flag || (distancesNext[j] < n);
}
if(flag || !n){
distances = distancesNext;
distancesNext = [];
}else{
return -1;
}
}
return distances[str1.length];
}