chore(build): add experimental Dart build that uses DDC for code analysis

.travis.yml

@@ -25,6 +25,7 @@ env:
   - MODE=js DART_CHANNEL=dev
   - MODE=dart DART_CHANNEL=stable
   - MODE=dart DART_CHANNEL=dev
+  - MODE=dart_experimental DART_CHANNEL=dev
 
 addons:
   firefox: "38.0"

gulpfile.js

@@ -243,6 +243,12 @@ gulp.task('build/analyze.dart', dartanalyzer(gulp, gulpPlugins, {
   command: DART_SDK.ANALYZER
 }));
 
+gulp.task('build/analyze.ddc.dart', dartanalyzer(gulp, gulpPlugins, {
+  dest: CONFIG.dest.dart,
+  command: DART_SDK.ANALYZER,
+  use_ddc: true
+}));
+
 // ------------
 // pubbuild
 // WARNING: this task is very slow (~15m as of July 2015)

scripts/ci/build_and_test.sh

@@ -8,6 +8,11 @@ echo ===========================================================================
 SCRIPT_DIR=$(dirname $0)
 cd $SCRIPT_DIR/../..
 
+if [ "$MODE" = "dart_experimental" ]
+then
+  ${SCRIPT_DIR}/build_$MODE.sh
+else
   ${SCRIPT_DIR}/build_$MODE.sh
   mkdir deploy; tar -czpf deploy/dist.tgz -C dist .
   ${SCRIPT_DIR}/test_$MODE.sh
+fi

scripts/ci/build_dart_experimental.sh

@@ -0,0 +1,15 @@
+#!/bin/bash
+set -e
+
+echo =============================================================================
+echo EXPERIMENTAL DART BUILD
+echo =============================================================================
+
+# go to project dir
+SCRIPT_DIR=$(dirname $0)
+source $SCRIPT_DIR/env_dart.sh
+cd $SCRIPT_DIR/../..
+
+./node_modules/.bin/gulp build/packages.dart
+./node_modules/.bin/gulp build/pubspec.dart
+./node_modules/.bin/gulp build/analyze.ddc.dart

scripts/ci/env_dart.sh

@@ -70,7 +70,9 @@ if [[ -z $ENV_SET ]]; then
   export DARTSDK
   export DART
   export PUB=${PUB:-"$DART_SDK/bin/pub"}
+  if [ -z "$PUB_CACHE" ]; then
     export PUB_CACHE=$DART_SDK/pub-cache
+  fi
   export DARTANALYZER=${DARTANALYZER:-"$DART_SDK/bin/dartanalyzer"}
   export DARTDOC=${DARTDOC:-"$DART_SDK/bin/dartdoc"}
   export DART_DOCGEN=${DART_DOCGEN:-"$DART_SDK/bin/docgen"}

tools/build/dartanalyzer.js

@@ -16,10 +16,9 @@ module.exports = function(gulp, plugins, config) {
       var packageName = pubspec.name;
 
       var libFiles = [].slice.call(glob.sync('lib/**/*.dart', {cwd: dir}));
-
       var webFiles = [].slice.call(glob.sync('web/**/*.dart', {cwd: dir}));
-
       var testFiles = [].slice.call(glob.sync('test/**/*_spec.dart', {cwd: dir}));
+
       var analyzeFile = ['library _analyzer;'];
       libFiles.concat(testFiles).concat(webFiles).forEach(function(fileName, index) {
         if (fileName !== tempFile && fileName.indexOf("/packages/") === -1) {
@@ -31,13 +30,24 @@ module.exports = function(gulp, plugins, config) {
       });
       fs.writeFileSync(path.join(dir, tempFile), analyzeFile.join('\n'));
       var defer = Q.defer();
+      if (config.use_ddc) {
+        analyze(dir, defer.makeNodeResolver(), true);
+      } else {
         analyze(dir, defer.makeNodeResolver());
+      }
       return defer.promise;
     });
 
-    function analyze(dirName, done) {
+    function analyze(dirName, done, useDdc) {
       // TODO remove --package-warnings once dartanalyzer handles transitive libraries
-      var args = ['--fatal-warnings', '--package-warnings', '--format=machine'].concat(tempFile);
+      var flags = ['--fatal-warnings', '--package-warnings', '--format=machine'];
+
+      if (useDdc) {
+        console.log('Using DDC analyzer to analyze', dirName);
+        flags.push('--strong');
+      }
+
+      var args = flags.concat(tempFile);
 
       var stream = spawn(config.command, args, {
         // inherit stdin and stderr, but filter stdout
@@ -97,7 +107,19 @@ module.exports = function(gulp, plugins, config) {
         if (report.length > 0) {
           error = 'Dartanalyzer showed ' + report.join(', ');
         }
+        if (useDdc) {
+          // TODO(yjbanov): fail the build when:
+          //  - DDC analyzer is stable enough
+          //  - We have cleaned up all DDC warnings
+          console.log(error);
+          done();
+        } else {
           done(error);
+        }
+      });
+      stream.on('error', function(e) {
+        // TODO(yjbanov): fail the build when DDC is stable enough
+        console.log('ERROR: failed to run DDC at all: ' + e);
       });
     }
   };