First commit of split-select tool

This tool emits a set of rules as JSON for when a Split APK
should match a target device.

Change-Id: I8bfbdfbdb51efcfc645889dd03e1961f16e39645

tools/split-select/SplitDescription.cpp

@@ -0,0 +1,175 @@
+/*
+ * Copyright (C) 2014 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "SplitDescription.h"
+
+#include "aapt/AaptConfig.h"
+#include "aapt/AaptUtil.h"
+
+#include <utils/String8.h>
+#include <utils/Vector.h>
+
+using namespace android;
+
+namespace split {
+
+SplitDescription::SplitDescription()
+: abi(abi::Variant::none) {
+}
+
+int SplitDescription::compare(const SplitDescription& rhs) const {
+    int cmp;
+    cmp = (int)abi - (int)rhs.abi;
+    if (cmp != 0) return cmp;
+    return config.compareLogical(rhs.config);
+}
+
+bool SplitDescription::isBetterThan(const SplitDescription& o, const SplitDescription& target) const {
+    if (abi != abi::Variant::none || o.abi != abi::Variant::none) {
+        abi::Family family = abi::getFamily(abi);
+        abi::Family oFamily = abi::getFamily(o.abi);
+        if (family != oFamily) {
+            return family != abi::Family::none;
+        }
+
+        if (int(target.abi) - int(abi) < int(target.abi) - int(o.abi)) {
+            return true;
+        }
+    }
+    return config.isBetterThan(o.config, &target.config);
+}
+
+bool SplitDescription::match(const SplitDescription& o) const {
+    if (abi != abi::Variant::none) {
+        abi::Family family = abi::getFamily(abi);
+        abi::Family oFamily = abi::getFamily(o.abi);
+        if (family != oFamily) {
+            return false;
+        }
+
+        if (int(abi) > int(o.abi)) {
+            return false;
+        }
+    }
+    return config.match(o.config);
+}
+
+String8 SplitDescription::toString() const {
+    String8 extension;
+    if (abi != abi::Variant::none) {
+        if (extension.isEmpty()) {
+            extension.append(":");
+        } else {
+            extension.append("-");
+        }
+        extension.append(abi::toString(abi));
+    }
+    String8 str(config.toString());
+    str.append(extension);
+    return str;
+}
+
+ssize_t parseAbi(const Vector<String8>& parts, const ssize_t index,
+        SplitDescription* outSplit) {
+    const ssize_t N = parts.size();
+    abi::Variant abi = abi::Variant::none;
+    ssize_t endIndex = index;
+    if (parts[endIndex] == "arm64") {
+        endIndex++;
+        if (endIndex < N) {
+            if (parts[endIndex] == "v8a") {
+                endIndex++;
+                abi = abi::Variant::arm64_v8a;
+            }
+        }
+    } else if (parts[endIndex] == "armeabi") {
+        endIndex++;
+        abi = abi::Variant::armeabi;
+        if (endIndex < N) {
+            if (parts[endIndex] == "v7a") {
+                endIndex++;
+                abi = abi::Variant::armeabi_v7a;
+            }
+        }
+    } else if (parts[endIndex] == "x86") {
+        endIndex++;
+        abi = abi::Variant::x86;
+    } else if (parts[endIndex] == "x86_64") {
+        endIndex++;
+        abi = abi::Variant::x86_64;
+    } else if (parts[endIndex] == "mips") {
+        endIndex++;
+        abi = abi::Variant::mips;
+    } else if (parts[endIndex] == "mips64") {
+        endIndex++;
+        abi = abi::Variant::mips64;
+    }
+
+    if (abi == abi::Variant::none && endIndex != index) {
+        return -1;
+    }
+
+    if (outSplit != NULL) {
+        outSplit->abi = abi;
+    }
+    return endIndex;
+}
+
+bool SplitDescription::parse(const String8& str, SplitDescription* outSplit) {
+    ssize_t index = str.find(":");
+
+    String8 configStr;
+    String8 extensionStr;
+    if (index >= 0) {
+        configStr.setTo(str.string(), index);
+        extensionStr.setTo(str.string() + index + 1);
+    } else {
+        configStr.setTo(str);
+    }
+
+    SplitDescription split;
+    if (!AaptConfig::parse(configStr, &split.config)) {
+        return false;
+    }
+
+    Vector<String8> parts = AaptUtil::splitAndLowerCase(extensionStr, '-');
+    const ssize_t N = parts.size();
+    index = 0;
+
+    if (extensionStr.length() == 0) {
+        goto success;
+    }
+
+    index = parseAbi(parts, index, &split);
+    if (index < 0) {
+        return false;
+    } else {
+        if (index == N) {
+            goto success;
+        }
+    }
+
+    // Unrecognized
+    return false;
+
+success:
+    if (outSplit != NULL) {
+        *outSplit = split;
+    }
+    return true;
+}
+
+} // namespace split