1 files changed, 125 insertions, 0 deletions
diff --git a/tools/aapt2/text/Unicode.cpp b/tools/aapt2/text/Unicode.cpp
new file mode 100644
index 000000000000..75eeb46c7f5e
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+++ b/tools/aapt2/text/Unicode.cpp
@@ -0,0 +1,125 @@
+/*
+ * Copyright (C) 2017 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 "text/Unicode.h"
+
+#include <algorithm>
+#include <array>
+
+#include "text/Utf8Iterator.h"
+
+using ::android::StringPiece;
+
+namespace aapt {
+namespace text {
+
+namespace {
+
+struct CharacterProperties {
+  enum : uint32_t {
+    kXidStart = 1 << 0,
+    kXidContinue = 1 << 1,
+  };
+
+  char32_t first_char;
+  char32_t last_char;
+  uint32_t properties;
+};
+
+// Incude the generated data table.
+#include "text/Unicode_data.cpp"
+
+bool CompareCharacterProperties(const CharacterProperties& a, char32_t codepoint) {
+  return a.last_char < codepoint;
+}
+
+uint32_t FindCharacterProperties(char32_t codepoint) {
+  const auto iter_end = sCharacterProperties.end();
+  const auto iter = std::lower_bound(sCharacterProperties.begin(), iter_end, codepoint,
+                                     CompareCharacterProperties);
+  if (iter != iter_end && codepoint >= iter->first_char) {
+    return iter->properties;
+  }
+  return 0u;
+}
+
+}  // namespace
+
+bool IsXidStart(char32_t codepoint) {
+  return FindCharacterProperties(codepoint) & CharacterProperties::kXidStart;
+}
+
+bool IsXidContinue(char32_t codepoint) {
+  return FindCharacterProperties(codepoint) & CharacterProperties::kXidContinue;
+}
+
+// Hardcode the White_Space characters since they are few and the external/icu project doesn't
+// list them as data files to parse.
+// Sourced from http://www.unicode.org/Public/UCD/latest/ucd/PropList.txt
+bool IsWhitespace(char32_t codepoint) {
+  return (codepoint >= 0x0009 && codepoint <= 0x000d) || (codepoint == 0x0020) ||
+         (codepoint == 0x0085) || (codepoint == 0x00a0) || (codepoint == 0x1680) ||
+         (codepoint >= 0x2000 && codepoint <= 0x200a) || (codepoint == 0x2028) ||
+         (codepoint == 0x2029) || (codepoint == 0x202f) || (codepoint == 0x205f) ||
+         (codepoint == 0x3000);
+}
+
+bool IsJavaIdentifier(const StringPiece& str) {
+  Utf8Iterator iter(str);
+
+  // Check the first character.
+  if (!iter.HasNext()) {
+    return false;
+  }
+
+  if (!IsXidStart(iter.Next())) {
+    return false;
+  }
+
+  while (iter.HasNext()) {
+    const char32_t codepoint = iter.Next();
+    if (!IsXidContinue(codepoint) && codepoint != U'$') {
+      return false;
+    }
+  }
+  return true;
+}
+
+bool IsValidResourceEntryName(const StringPiece& str) {
+  Utf8Iterator iter(str);
+
+  // Check the first character.
+  if (!iter.HasNext()) {
+    return false;
+  }
+
+  // Resources are allowed to start with '_'
+  const char32_t first_codepoint = iter.Next();
+  if (!IsXidStart(first_codepoint) && first_codepoint != U'_') {
+    return false;
+  }
+
+  while (iter.HasNext()) {
+    const char32_t codepoint = iter.Next();
+    if (!IsXidContinue(codepoint) && codepoint != U'.' && codepoint != U'-') {
+      return false;
+    }
+  }
+  return true;
+}
+
+}  // namespace text
+}  // namespace aapt