Adam Lesinski | 66ea840 | 2017-06-28 11:44:11 -0700 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright (C) 2017 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | #include "text/Unicode.h" |
| 18 | |
| 19 | #include <algorithm> |
| 20 | #include <array> |
| 21 | |
| 22 | #include "text/Utf8Iterator.h" |
| 23 | |
| 24 | using ::android::StringPiece; |
| 25 | |
| 26 | namespace aapt { |
| 27 | namespace text { |
| 28 | |
| 29 | namespace { |
| 30 | |
| 31 | struct CharacterProperties { |
| 32 | enum : uint32_t { |
| 33 | kXidStart = 1 << 0, |
| 34 | kXidContinue = 1 << 1, |
| 35 | }; |
| 36 | |
| 37 | char32_t first_char; |
| 38 | char32_t last_char; |
| 39 | uint32_t properties; |
| 40 | }; |
| 41 | |
| 42 | // Incude the generated data table. |
| 43 | #include "text/Unicode_data.cpp" |
| 44 | |
| 45 | bool CompareCharacterProperties(const CharacterProperties& a, char32_t codepoint) { |
| 46 | return a.last_char < codepoint; |
| 47 | } |
| 48 | |
| 49 | uint32_t FindCharacterProperties(char32_t codepoint) { |
| 50 | const auto iter_end = sCharacterProperties.end(); |
| 51 | const auto iter = std::lower_bound(sCharacterProperties.begin(), iter_end, codepoint, |
| 52 | CompareCharacterProperties); |
| 53 | if (iter != iter_end && codepoint >= iter->first_char) { |
| 54 | return iter->properties; |
| 55 | } |
| 56 | return 0u; |
| 57 | } |
| 58 | |
| 59 | } // namespace |
| 60 | |
| 61 | bool IsXidStart(char32_t codepoint) { |
| 62 | return FindCharacterProperties(codepoint) & CharacterProperties::kXidStart; |
| 63 | } |
| 64 | |
| 65 | bool IsXidContinue(char32_t codepoint) { |
| 66 | return FindCharacterProperties(codepoint) & CharacterProperties::kXidContinue; |
| 67 | } |
| 68 | |
| 69 | bool IsJavaIdentifier(const StringPiece& str) { |
| 70 | Utf8Iterator iter(str); |
| 71 | |
| 72 | // Check the first character. |
| 73 | if (!iter.HasNext()) { |
| 74 | return false; |
| 75 | } |
| 76 | |
| 77 | if (!IsXidStart(iter.Next())) { |
| 78 | return false; |
| 79 | } |
| 80 | |
| 81 | while (iter.HasNext()) { |
| 82 | const char32_t codepoint = iter.Next(); |
| 83 | if (!IsXidContinue(codepoint) && codepoint != U'$') { |
| 84 | return false; |
| 85 | } |
| 86 | } |
| 87 | return true; |
| 88 | } |
| 89 | |
| 90 | bool IsValidResourceEntryName(const StringPiece& str) { |
| 91 | Utf8Iterator iter(str); |
| 92 | |
| 93 | // Check the first character. |
| 94 | if (!iter.HasNext()) { |
| 95 | return false; |
| 96 | } |
| 97 | |
| 98 | // Resources are allowed to start with '_' |
| 99 | const char32_t first_codepoint = iter.Next(); |
| 100 | if (!IsXidStart(first_codepoint) && first_codepoint != U'_') { |
| 101 | return false; |
| 102 | } |
| 103 | |
| 104 | while (iter.HasNext()) { |
| 105 | const char32_t codepoint = iter.Next(); |
| 106 | if (!IsXidContinue(codepoint) && codepoint != U'.' && codepoint != U'-') { |
| 107 | return false; |
| 108 | } |
| 109 | } |
| 110 | return true; |
| 111 | } |
| 112 | |
| 113 | } // namespace text |
| 114 | } // namespace aapt |