AAPT2: Fix product support

Previously the default product wasn't tried if 'default' wasn't specified on the command line.
Also adds support for multiple products.

Change-Id: I1e4872b34bb8d609b6444841a4e7e4dbb3bbb76b
diff --git a/tools/aapt2/ResourceParser.cpp b/tools/aapt2/ResourceParser.cpp
index 1e879a0..e1f9642 100644
--- a/tools/aapt2/ResourceParser.cpp
+++ b/tools/aapt2/ResourceParser.cpp
@@ -19,6 +19,7 @@
 #include "ResourceUtils.h"
 #include "ResourceValues.h"
 #include "ValueVisitor.h"
+#include "util/Comparators.h"
 #include "util/ImmutableMap.h"
 #include "util/Util.h"
 #include "xml/XmlPullParser.h"
@@ -64,26 +65,6 @@
     return mask;
 }
 
-static bool shouldStripResource(const xml::XmlPullParser* parser,
-                                const Maybe<std::u16string> productToMatch) {
-    assert(parser->getEvent() == xml::XmlPullParser::Event::kStartElement);
-
-    if (Maybe<StringPiece16> maybeProduct = xml::findNonEmptyAttribute(parser, u"product")) {
-        if (!productToMatch) {
-            if (maybeProduct.value() != u"default" && maybeProduct.value() != u"phone") {
-                // We didn't specify a product and this is not a default product, so skip.
-                return true;
-            }
-        } else {
-            if (productToMatch && maybeProduct.value() != productToMatch.value()) {
-                // We specified a product, but they don't match.
-                return true;
-            }
-        }
-    }
-    return false;
-}
-
 /**
  * A parsed resource ready to be added to the ResourceTable.
  */
@@ -97,6 +78,35 @@
     std::list<ParsedResource> childResources;
 };
 
+bool ResourceParser::shouldStripResource(const ResourceNameRef& name,
+                                         const Maybe<std::u16string>& product) const {
+    if (product) {
+        for (const std::u16string& productToMatch : mOptions.products) {
+            if (product.value() == productToMatch) {
+                // We specified a product, and it is in the list, so don't strip.
+                return false;
+            }
+        }
+    }
+
+    // Nothing matched, try 'default'. Default only matches if we didn't already use another
+    // product variant.
+    if (!product || product.value() == u"default") {
+        if (Maybe<ResourceTable::SearchResult> result = mTable->findResource(name)) {
+            const ResourceEntry* entry = result.value().entry;
+            auto iter = std::lower_bound(entry->values.begin(), entry->values.end(), mConfig,
+                                         cmp::lessThanConfig);
+            if (iter != entry->values.end() && iter->config == mConfig && !iter->value->isWeak()) {
+                // We have a value for this config already, and it is not weak,
+                // so filter out this default.
+                return true;
+            }
+        }
+        return false;
+    }
+    return true;
+}
+
 // Recursively adds resources to the ResourceTable.
 static bool addResourcesToTable(ResourceTable* table, const ConfigDescription& config,
                                 IDiagnostics* diag, ParsedResource* res) {
@@ -283,17 +293,20 @@
         parsedResource.source = mSource.withLine(parser->getLineNumber());
         parsedResource.comment = std::move(comment);
 
-        // Check if we should skip this product. We still need to parse it for correctness.
-        const bool stripResource = shouldStripResource(parser, mOptions.product);
+        // Extract the product name if it exists.
+        Maybe<std::u16string> product;
+        if (Maybe<StringPiece16> maybeProduct = xml::findNonEmptyAttribute(parser, u"product")) {
+            product = maybeProduct.value().toString();
+        }
 
+        // Parse the resource regardless of product.
         if (!parseResource(parser, &parsedResource)) {
             error = true;
             continue;
         }
 
-        // We successfully parsed the resource.
-
-        if (stripResource) {
+        // We successfully parsed the resource. Check if we should include it or strip it.
+        if (shouldStripResource(parsedResource.name, product)) {
             // Record that we stripped out this resource name.
             // We will check that at least one variant of this resource was included.
             strippedResources.insert(parsedResource.name);
diff --git a/tools/aapt2/ResourceParser.h b/tools/aapt2/ResourceParser.h
index 29b1bc1..9ad749e 100644
--- a/tools/aapt2/ResourceParser.h
+++ b/tools/aapt2/ResourceParser.h
@@ -34,11 +34,11 @@
 
 struct ResourceParserOptions {
     /**
-     * Optional product name by which to filter resources.
+     * Optional product names by which to filter resources.
      * This is like a preprocessor definition in that we strip out resources
      * that don't match before we compile them.
      */
-    Maybe<std::u16string> product;
+    std::vector<std::u16string> products;
 
     /**
      * Whether the default setting for this parser is to allow translation.
@@ -101,6 +101,9 @@
     bool parseArrayImpl(xml::XmlPullParser* parser, ParsedResource* outResource, uint32_t typeMask);
     bool parsePlural(xml::XmlPullParser* parser, ParsedResource* outResource);
 
+    bool shouldStripResource(const ResourceNameRef& name,
+                             const Maybe<std::u16string>& product) const;
+
     IDiagnostics* mDiag;
     ResourceTable* mTable;
     Source mSource;
diff --git a/tools/aapt2/ResourceParser_test.cpp b/tools/aapt2/ResourceParser_test.cpp
index ab44a06..8d10ba1 100644
--- a/tools/aapt2/ResourceParser_test.cpp
+++ b/tools/aapt2/ResourceParser_test.cpp
@@ -48,11 +48,11 @@
     }
 
     ::testing::AssertionResult testParse(const StringPiece& str,
-                                         Maybe<std::u16string> product = {}) {
+                                         std::initializer_list<std::u16string> products = {}) {
         std::stringstream input(kXmlPreamble);
         input << "<resources>\n" << str << "\n</resources>" << std::endl;
         ResourceParserOptions parserOptions;
-        parserOptions.product = product;
+        parserOptions.products = products;
         ResourceParser parser(mContext->getDiagnostics(), &mTable, Source{ "test" }, {},
                               parserOptions);
         xml::XmlPullParser xmlParser(input);
@@ -514,11 +514,15 @@
 }
 
 TEST_F(ResourceParserTest, FilterProductsThatDontMatch) {
-    std::string input = "<string name=\"foo\" product=\"phone\">hi</string>\n"
-                        "<string name=\"foo\" product=\"no-sdcard\">ho</string>\n"
-                        "<string name=\"bar\" product=\"\">wee</string>\n"
-                        "<string name=\"baz\">woo</string>\n";
-    ASSERT_TRUE(testParse(input, std::u16string(u"no-sdcard")));
+    std::string input = R"EOF(
+        <string name="foo" product="phone">hi</string>
+        <string name="foo" product="no-sdcard">ho</string>
+        <string name="bar" product="">wee</string>
+        <string name="baz">woo</string>
+        <string name="bit" product="phablet">hoot</string>
+        <string name="bot" product="default">yes</string>
+    )EOF";
+    ASSERT_TRUE(testParse(input, { std::u16string(u"no-sdcard"), std::u16string(u"phablet") }));
 
     String* fooStr = test::getValue<String>(&mTable, u"@string/foo");
     ASSERT_NE(nullptr, fooStr);
@@ -526,11 +530,25 @@
 
     EXPECT_NE(nullptr, test::getValue<String>(&mTable, u"@string/bar"));
     EXPECT_NE(nullptr, test::getValue<String>(&mTable, u"@string/baz"));
+    EXPECT_NE(nullptr, test::getValue<String>(&mTable, u"@string/bit"));
+    EXPECT_NE(nullptr, test::getValue<String>(&mTable, u"@string/bot"));
+}
+
+TEST_F(ResourceParserTest, FilterProductsThatBothMatchInOrder) {
+    std::string input = R"EOF(
+        <string name="foo" product="phone">phone</string>
+        <string name="foo" product="default">default</string>
+    )EOF";
+    ASSERT_TRUE(testParse(input, { std::u16string(u"phone") }));
+
+    String* foo = test::getValue<String>(&mTable, u"@string/foo");
+    ASSERT_NE(nullptr, foo);
+    EXPECT_EQ(std::u16string(u"phone"), *foo->value);
 }
 
 TEST_F(ResourceParserTest, FailWhenProductFilterStripsOutAllVersionsOfResource) {
     std::string input = "<string name=\"foo\" product=\"tablet\">hello</string>\n";
-    ASSERT_FALSE(testParse(input, std::u16string(u"phone")));
+    ASSERT_FALSE(testParse(input, { std::u16string(u"phone") }));
 }
 
 TEST_F(ResourceParserTest, AutoIncrementIdsInPublicGroup) {
diff --git a/tools/aapt2/compile/Compile.cpp b/tools/aapt2/compile/Compile.cpp
index 967e236..b3b0f65 100644
--- a/tools/aapt2/compile/Compile.cpp
+++ b/tools/aapt2/compile/Compile.cpp
@@ -105,7 +105,7 @@
 struct CompileOptions {
     std::string outputPath;
     Maybe<std::string> resDir;
-    Maybe<std::u16string> product;
+    std::vector<std::u16string> products;
     bool pseudolocalize = false;
     bool verbose = false;
 };
@@ -191,7 +191,7 @@
         xml::XmlPullParser xmlParser(fin);
 
         ResourceParserOptions parserOptions;
-        parserOptions.product = options.product;
+        parserOptions.products = options.products;
 
         // If the filename includes donottranslate, then the default translatable is false.
         parserOptions.translatable = pathData.name.find(u"donottranslate") == std::string::npos;
@@ -430,10 +430,11 @@
 int compile(const std::vector<StringPiece>& args) {
     CompileOptions options;
 
-    Maybe<std::string> product;
+    Maybe<std::string> productList;
     Flags flags = Flags()
             .requiredFlag("-o", "Output path", &options.outputPath)
-            .optionalFlag("--product", "Product type to compile", &product)
+            .optionalFlag("--product", "Comma separated list of product types to compile",
+                          &productList)
             .optionalFlag("--dir", "Directory to scan for resources", &options.resDir)
             .optionalSwitch("--pseudo-localize", "Generate resources for pseudo-locales "
                             "(en-XA and ar-XB)", &options.pseudolocalize)
@@ -442,8 +443,10 @@
         return 1;
     }
 
-    if (product) {
-        options.product = util::utf8ToUtf16(product.value());
+    if (productList) {
+        for (StringPiece part : util::tokenize<char>(productList.value(), ',')) {
+            options.products.push_back(util::utf8ToUtf16(part));
+        }
     }
 
     CompileContext context;