angular2
Version:
Angular 2 - a web framework for modern web apps
74 lines (73 loc) • 2.96 kB
JavaScript
import { BaseException } from 'angular2/src/facade/exceptions';
import { isPresent, isBlank, RegExpWrapper, Math } from 'angular2/src/facade/lang';
// asset:<package-name>/<realm>/<path-to-module>
var _ASSET_URL_RE = /asset:([^\/]+)\/([^\/]+)\/(.+)/g;
var _PATH_SEP = '/';
var _PATH_SEP_RE = /\//g;
export var ImportEnv;
(function (ImportEnv) {
ImportEnv[ImportEnv["Dart"] = 0] = "Dart";
ImportEnv[ImportEnv["JS"] = 1] = "JS";
})(ImportEnv || (ImportEnv = {}));
/**
* Returns the module path to use for an import.
*/
export function getImportModulePath(moduleUrlStr, importedUrlStr, importEnv) {
var absolutePathPrefix = importEnv === ImportEnv.Dart ? `package:` : '';
var moduleUrl = _AssetUrl.parse(moduleUrlStr, false);
var importedUrl = _AssetUrl.parse(importedUrlStr, true);
if (isBlank(importedUrl)) {
return importedUrlStr;
}
// Try to create a relative path first
if (moduleUrl.firstLevelDir == importedUrl.firstLevelDir &&
moduleUrl.packageName == importedUrl.packageName) {
return getRelativePath(moduleUrl.modulePath, importedUrl.modulePath, importEnv);
}
else if (importedUrl.firstLevelDir == 'lib') {
return `${absolutePathPrefix}${importedUrl.packageName}/${importedUrl.modulePath}`;
}
throw new BaseException(`Can't import url ${importedUrlStr} from ${moduleUrlStr}`);
}
class _AssetUrl {
constructor(packageName, firstLevelDir, modulePath) {
this.packageName = packageName;
this.firstLevelDir = firstLevelDir;
this.modulePath = modulePath;
}
static parse(url, allowNonMatching) {
var match = RegExpWrapper.firstMatch(_ASSET_URL_RE, url);
if (isPresent(match)) {
return new _AssetUrl(match[1], match[2], match[3]);
}
if (allowNonMatching) {
return null;
}
throw new BaseException(`Url ${url} is not a valid asset: url`);
}
}
export function getRelativePath(modulePath, importedPath, importEnv) {
var moduleParts = modulePath.split(_PATH_SEP_RE);
var importedParts = importedPath.split(_PATH_SEP_RE);
var longestPrefix = getLongestPathSegmentPrefix(moduleParts, importedParts);
var resultParts = [];
var goParentCount = moduleParts.length - 1 - longestPrefix;
for (var i = 0; i < goParentCount; i++) {
resultParts.push('..');
}
if (goParentCount <= 0 && importEnv === ImportEnv.JS) {
resultParts.push('.');
}
for (var i = longestPrefix; i < importedParts.length; i++) {
resultParts.push(importedParts[i]);
}
return resultParts.join(_PATH_SEP);
}
export function getLongestPathSegmentPrefix(arr1, arr2) {
var prefixSize = 0;
var minLen = Math.min(arr1.length, arr2.length);
while (prefixSize < minLen && arr1[prefixSize] == arr2[prefixSize]) {
prefixSize++;
}
return prefixSize;
}