angular-docs-cn/karma-dart-evalcache.js

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// This module provides a customFileHandler for karma
// that serves files with urls like /packages_<timestamp>/...
// with maximum cache.
// We are using these urls when we spawn isolates
// so that the isolates don't reload files every time.
var common = require('karma/lib/middleware/common');
var fs = require('fs');
var DART_EVAL_PATH_RE = /.*\/packages_\d+\/(.*)$/;
module.exports = createFactory;
function createFactory(proxyPaths) {
return {
'framework:dart-evalcache': ['factory', dartEvalCacheFactory]
};
function dartEvalCacheFactory(emitter, logger, customFileHandlers) {
var filesPromise = new common.PromiseContainer();
emitter.on('file_list_modified', function(files) {
filesPromise.set(files);
});
var serveFile = common.createServeFile(fs);
var log = logger.create('dart-evalcache');
customFileHandlers.push({
urlRegex: DART_EVAL_PATH_RE,
handler: handler
});
// See source_files handler
function handler(request, response, fa, fb, basePath) {
return filesPromise.then(function(files) {
try {
var requestedFilePath = mapUrlToFile(request.url, proxyPaths, basePath, log);
// TODO(vojta): change served to be a map rather then an array
var file = findByPath(files.served, requestedFilePath);
if (file) {
serveFile(file.contentPath || file.path, response, function() {
common.setHeavyCacheHeaders(response);
}, file.content);
} else {
response.writeHead(404);
response.end('Not found');
}
} catch (e) {
log.error(e.stack);
response.writeHead(500);
response.end('Error', e.stack);
}
});
}
};
}
function mapUrlToFile(url, proxyPaths, basePath, log) {
var originalUrl = url;
url = url.indexOf('?') > -1 ? url.substring(0, url.indexOf('?')) : url;
var match = DART_EVAL_PATH_RE.exec(url);
var packagePath = match[1];
var result = null;
var lastProxyFromLength = 0;
Object.keys(proxyPaths).forEach(function(proxyFrom) {
if (startsWith(packagePath, proxyFrom) && proxyFrom.length > lastProxyFromLength) {
lastProxyFromLength = proxyFrom.length;
result = proxyPaths[proxyFrom] + packagePath.substring(proxyFrom.length);
}
});
return basePath + '/' + result;
}
function startsWith(string, subString) {
return string.length >= subString.length && string.slice(0, subString.length) === subString;
}
function findByPath(files, path) {
for (var i = 0; i < files.length; i++) {
if (files[i].path === path) {
return files[i];
}
}
return null;
}