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/**
* @fileoverview Utility to translate test files to CommonJS imports.
*
* This is a somewhat hacky tool designed to do one very specific thing.
* All of the test files in *_test.js are written with Closure-style
* imports (goog.require()). This works great for running the tests
* against Closure-style generated code, but we also want to run the
* tests against CommonJS-style generated code without having to fork
* the tests.
*
* Closure-style imports import each individual type by name. This is
* very different than CommonJS imports which are by file. So we put
* special comments in these tests like:
*
* // CommonJS-LoadFromFile: test_pb
* goog.require('proto.jspb.test.CloneExtension');
* goog.require('proto.jspb.test.Complex');
* goog.require('proto.jspb.test.DefaultValues');
*
* This script parses that special comment and uses it to generate proper
* CommonJS require() statements so that the tests can run and pass using
* CommonJS imports. The script will change the above statements into:
*
* var test_pb = require('test_pb');
* googleProtobuf.exportSymbol('proto.jspb.test.CloneExtension', test_pb.CloneExtension, global);
* googleProtobuf.exportSymbol('proto.jspb.test.Complex', test_pb.Complex, global);
* googleProtobuf.exportSymbol('proto.jspb.test.DefaultValues', test_pb.DefaultValues, global);
*
* (The "exportSymbol" function will define the given names in the global
* namespace, taking care not to overwrite any previous value for
* "proto.jspb.test").
*/
var lineReader = require('readline').createInterface({
input: process.stdin,
output: process.stdout
});
function tryStripPrefix(str, prefix) {
if (str.lastIndexOf(prefix) !== 0) {
throw "String: " + str + " didn't start with: " + prefix;
}
return str.substr(prefix.length);
}
var module = null;
var pkg = null;
lineReader.on('line', function(line) {
var isRequire = line.match(/goog\.require\('([^']*)'\)/);
var isLoadFromFile = line.match(/CommonJS-LoadFromFile: (\S*) (.*)/);
var isSetTestOnly = line.match(/goog.setTestOnly()/);
if (isRequire) {
if (module) { // Skip goog.require() lines before the first directive.
var fullSym = isRequire[1];
var sym = tryStripPrefix(fullSym, pkg);
console.log("googleProtobuf.exportSymbol('" + fullSym + "', " + module + sym + ', global);');
}
} else if (isLoadFromFile) {
if (!module) {
console.log("var googleProtobuf = require('google-protobuf');");
console.log("var asserts = require('closure_asserts_commonjs');");
console.log("var global = Function('return this')();");
console.log("");
console.log("// Bring asserts into the global namespace.");
console.log("googleProtobuf.object.extend(global, asserts);");
}
module = isLoadFromFile[1].replace("-", "_");
pkg = isLoadFromFile[2];
if (module != "googleProtobuf") { // We unconditionally require this in the header.
console.log("var " + module + " = require('" + isLoadFromFile[1] + "');");
}
} else if (!isSetTestOnly) { // Remove goog.setTestOnly() lines.
console.log(line);
}
});
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