1/**
2 * @fileoverview Utility to translate test files to CommonJS imports.
3 *
4 * This is a somewhat hacky tool designed to do one very specific thing.
5 * All of the test files in *_test.js are written with Closure-style
6 * imports (goog.require()).  This works great for running the tests
7 * against Closure-style generated code, but we also want to run the
8 * tests against CommonJS-style generated code without having to fork
9 * the tests.
10 *
11 * Closure-style imports import each individual type by name.  This is
12 * very different than CommonJS imports which are by file.  So we put
13 * special comments in these tests like:
14 *
15 * // CommonJS-LoadFromFile: test_pb
16 * goog.require('proto.jspb.test.CloneExtension');
17 * goog.require('proto.jspb.test.Complex');
18 * goog.require('proto.jspb.test.DefaultValues');
19 *
20 * This script parses that special comment and uses it to generate proper
21 * CommonJS require() statements so that the tests can run and pass using
22 * CommonJS imports.  The script will change the above statements into:
23 *
24 *   var test_pb = require('test_pb');
25 *   googleProtobuf.exportSymbol('proto.jspb.test.CloneExtension', test_pb.CloneExtension, global);
26 *   googleProtobuf.exportSymbol('proto.jspb.test.Complex', test_pb.Complex, global);
27 *   googleProtobuf.exportSymbol('proto.jspb.test.DefaultValues', test_pb.DefaultValues, global);
28 *
29 * (The "exportSymbol" function will define the given names in the global
30 * namespace, taking care not to overwrite any previous value for
31 * "proto.jspb.test").
32 */
33
34var lineReader = require('readline').createInterface({
35  input: process.stdin,
36  output: process.stdout
37});
38
39function tryStripPrefix(str, prefix) {
40  if (str.lastIndexOf(prefix) !== 0) {
41    throw "String: " + str + " didn't start with: " + prefix;
42  }
43  return str.substr(prefix.length);
44}
45
46function camelCase(str) {
47  var ret = '';
48  var ucaseNext = false;
49  for (var i = 0; i < str.length; i++) {
50    if (str[i] == '-') {
51      ucaseNext = true;
52    } else if (ucaseNext) {
53      ret += str[i].toUpperCase();
54      ucaseNext = false;
55    } else {
56      ret += str[i];
57    }
58  }
59  return ret;
60}
61
62var module = null;
63var pkg = null;
64
65// Header: goes in every file at the top.
66console.log("var global = Function('return this')();");
67console.log("var googleProtobuf = require('google-protobuf');");
68console.log("var testdeps = require('testdeps_commonjs');");
69console.log("global.goog = testdeps.goog;");
70console.log("global.jspb = testdeps.jspb;");
71console.log("var asserts = require('closure_asserts_commonjs');");
72console.log("");
73console.log("// Bring asserts into the global namespace.");
74console.log("googleProtobuf.object.extend(global, asserts);");
75
76lineReader.on('line', function(line) {
77  var isRequire = line.match(/goog\.require\('([^']*)'\)/);
78  var isLoadFromFile = line.match(/CommonJS-LoadFromFile: (\S*) (.*)/);
79  var isSetTestOnly = line.match(/goog.setTestOnly()/);
80  if (isRequire) {
81    if (module) {  // Skip goog.require() lines before the first directive.
82      var fullSym = isRequire[1];
83      var sym = tryStripPrefix(fullSym, pkg);
84      console.log("googleProtobuf.exportSymbol('" + fullSym + "', " + module + sym + ', global);');
85    }
86  } else if (isLoadFromFile) {
87    var module_path = isLoadFromFile[1].split('/');
88    module = camelCase(module_path[module_path.length - 1]);
89    pkg = isLoadFromFile[2];
90
91    if (module != "googleProtobuf") {  // We unconditionally require this in the header.
92      console.log("var " + module + " = require('./" + isLoadFromFile[1] + "');");
93    }
94  } else if (!isSetTestOnly) {  // Remove goog.setTestOnly() lines.
95    console.log(line);
96  }
97});
98