external: import cpu_features library

Taken from https://github.com/google/cpu_features at revision
26133d3b620c2c27f31d571efd27371100f891e9

external/cpu_features/test/string_view_test.cc

@@ -0,0 +1,144 @@
+// Copyright 2017 Google Inc.
+//
+// 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 "internal/string_view.h"
+
+#include "gtest/gtest.h"
+
+namespace cpu_features {
+
+bool operator==(const StringView& a, const StringView& b) {
+  return CpuFeatures_StringView_IsEquals(a, b);
+}
+
+namespace {
+
+TEST(StringViewTest, Empty) {
+  EXPECT_EQ(kEmptyStringView.ptr, nullptr);
+  EXPECT_EQ(kEmptyStringView.size, 0);
+}
+
+TEST(StringViewTest, Build) {
+  const auto view = str("test");
+  EXPECT_EQ(view.ptr[0], 't');
+  EXPECT_EQ(view.size, 4);
+}
+
+TEST(StringViewTest, CpuFeatures_StringView_IndexOfChar) {
+  // Found.
+  EXPECT_EQ(CpuFeatures_StringView_IndexOfChar(str("test"), 'e'), 1);
+  // Not found.
+  EXPECT_EQ(CpuFeatures_StringView_IndexOfChar(str("test"), 'z'), -1);
+  // Empty.
+  EXPECT_EQ(CpuFeatures_StringView_IndexOfChar(kEmptyStringView, 'z'), -1);
+}
+
+TEST(StringViewTest, CpuFeatures_StringView_IndexOf) {
+  // Found.
+  EXPECT_EQ(CpuFeatures_StringView_IndexOf(str("test"), str("es")), 1);
+  // Not found.
+  EXPECT_EQ(CpuFeatures_StringView_IndexOf(str("test"), str("aa")), -1);
+  // Empty.
+  EXPECT_EQ(CpuFeatures_StringView_IndexOf(kEmptyStringView, str("aa")), -1);
+  EXPECT_EQ(CpuFeatures_StringView_IndexOf(str("aa"), kEmptyStringView), -1);
+}
+
+TEST(StringViewTest, CpuFeatures_StringView_StartsWith) {
+  EXPECT_TRUE(CpuFeatures_StringView_StartsWith(str("test"), str("te")));
+  EXPECT_FALSE(CpuFeatures_StringView_StartsWith(str("test"), str("")));
+  EXPECT_FALSE(
+      CpuFeatures_StringView_StartsWith(str("test"), kEmptyStringView));
+  EXPECT_FALSE(
+      CpuFeatures_StringView_StartsWith(kEmptyStringView, str("test")));
+}
+
+TEST(StringViewTest, CpuFeatures_StringView_IsEquals) {
+  EXPECT_TRUE(
+      CpuFeatures_StringView_IsEquals(kEmptyStringView, kEmptyStringView));
+  EXPECT_TRUE(CpuFeatures_StringView_IsEquals(kEmptyStringView, str("")));
+  EXPECT_TRUE(CpuFeatures_StringView_IsEquals(str(""), kEmptyStringView));
+  EXPECT_TRUE(CpuFeatures_StringView_IsEquals(str("a"), str("a")));
+  EXPECT_FALSE(CpuFeatures_StringView_IsEquals(str("a"), str("b")));
+  EXPECT_FALSE(CpuFeatures_StringView_IsEquals(str("a"), kEmptyStringView));
+  EXPECT_FALSE(CpuFeatures_StringView_IsEquals(kEmptyStringView, str("a")));
+}
+
+TEST(StringViewTest, CpuFeatures_StringView_PopFront) {
+  EXPECT_EQ(CpuFeatures_StringView_PopFront(str("test"), 2), str("st"));
+  EXPECT_EQ(CpuFeatures_StringView_PopFront(str("test"), 0), str("test"));
+  EXPECT_EQ(CpuFeatures_StringView_PopFront(str("test"), 4), str(""));
+  EXPECT_EQ(CpuFeatures_StringView_PopFront(str("test"), 100), str(""));
+}
+
+TEST(StringViewTest, CpuFeatures_StringView_ParsePositiveNumber) {
+  EXPECT_EQ(CpuFeatures_StringView_ParsePositiveNumber(str("42")), 42);
+  EXPECT_EQ(CpuFeatures_StringView_ParsePositiveNumber(str("0x2a")), 42);
+  EXPECT_EQ(CpuFeatures_StringView_ParsePositiveNumber(str("0x2A")), 42);
+
+  EXPECT_EQ(CpuFeatures_StringView_ParsePositiveNumber(str("-0x2A")), -1);
+  EXPECT_EQ(CpuFeatures_StringView_ParsePositiveNumber(str("abc")), -1);
+  EXPECT_EQ(CpuFeatures_StringView_ParsePositiveNumber(str("")), -1);
+}
+
+TEST(StringViewTest, CpuFeatures_StringView_CopyString) {
+  char buf[4];
+  buf[0] = 'X';
+
+  // Empty
+  CpuFeatures_StringView_CopyString(str(""), buf, sizeof(buf));
+  EXPECT_STREQ(buf, "");
+
+  // Less
+  CpuFeatures_StringView_CopyString(str("a"), buf, sizeof(buf));
+  EXPECT_STREQ(buf, "a");
+
+  // exact
+  CpuFeatures_StringView_CopyString(str("abc"), buf, sizeof(buf));
+  EXPECT_STREQ(buf, "abc");
+
+  // More
+  CpuFeatures_StringView_CopyString(str("abcd"), buf, sizeof(buf));
+  EXPECT_STREQ(buf, "abc");
+}
+
+TEST(StringViewTest, CpuFeatures_StringView_HasWord) {
+  // Find flags at beginning, middle and end.
+  EXPECT_TRUE(
+      CpuFeatures_StringView_HasWord(str("first middle last"), "first"));
+  EXPECT_TRUE(
+      CpuFeatures_StringView_HasWord(str("first middle last"), "middle"));
+  EXPECT_TRUE(CpuFeatures_StringView_HasWord(str("first middle last"), "last"));
+  // Do not match partial flags
+  EXPECT_FALSE(
+      CpuFeatures_StringView_HasWord(str("first middle last"), "irst"));
+  EXPECT_FALSE(CpuFeatures_StringView_HasWord(str("first middle last"), "mid"));
+  EXPECT_FALSE(CpuFeatures_StringView_HasWord(str("first middle last"), "las"));
+}
+
+TEST(StringViewTest, CpuFeatures_StringView_GetAttributeKeyValue) {
+  const StringView line = str(" key :   first middle last   ");
+  StringView key, value;
+  EXPECT_TRUE(CpuFeatures_StringView_GetAttributeKeyValue(line, &key, &value));
+  EXPECT_EQ(key, str("key"));
+  EXPECT_EQ(value, str("first middle last"));
+}
+
+TEST(StringViewTest, FailingGetAttributeKeyValue) {
+  const StringView line = str("key  first middle last");
+  StringView key, value;
+  EXPECT_FALSE(CpuFeatures_StringView_GetAttributeKeyValue(line, &key, &value));
+}
+
+}  // namespace
+}  // namespace cpu_features