1 /* 2 * Copyright (C) 2010 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 #define LOG_TAG "Matcher" 18 19 #include <stdlib.h> 20 21 #include "IcuUtilities.h" 22 #include "JNIHelp.h" 23 #include "JniConstants.h" 24 #include "JniException.h" 25 #include "ScopedPrimitiveArray.h" 26 #include "jni.h" 27 #include "unicode/parseerr.h" 28 #include "unicode/regex.h" 29 30 // ICU documentation: http://icu-project.org/apiref/icu4c/classRegexMatcher.html 31 32 static icu::RegexMatcher* toRegexMatcher(jlong address) { 33 return reinterpret_cast<icu::RegexMatcher*>(static_cast<uintptr_t>(address)); 34 } 35 36 /** 37 * We use ICU4C's RegexMatcher class, but our input is on the Java heap and potentially moving 38 * around between calls. This wrapper class ensures that our RegexMatcher is always pointing at 39 * the current location of the char[]. Earlier versions of Android simply copied the data to the 40 * native heap, but that's wasteful and hides allocations from the garbage collector. 41 */ 42 class MatcherAccessor { 43 public: 44 MatcherAccessor(JNIEnv* env, jlong address, jstring javaInput, bool reset) { 45 init(env, address); 46 47 mJavaInput = javaInput; 48 mChars = env->GetStringChars(mJavaInput, NULL); 49 if (mChars == NULL) { 50 return; 51 } 52 53 mUText = utext_openUChars(NULL, mChars, env->GetStringLength(mJavaInput), &mStatus); 54 if (mUText == NULL) { 55 return; 56 } 57 58 if (reset) { 59 mMatcher->reset(mUText); 60 } else { 61 mMatcher->refreshInputText(mUText, mStatus); 62 } 63 } 64 65 MatcherAccessor(JNIEnv* env, jlong address) { 66 init(env, address); 67 } 68 69 ~MatcherAccessor() { 70 utext_close(mUText); 71 if (mJavaInput) { 72 mEnv->ReleaseStringChars(mJavaInput, mChars); 73 } 74 maybeThrowIcuException(mEnv, "utext_close", mStatus); 75 } 76 77 icu::RegexMatcher* operator->() { 78 return mMatcher; 79 } 80 81 UErrorCode& status() { 82 return mStatus; 83 } 84 85 void updateOffsets(jintArray javaOffsets) { 86 ScopedIntArrayRW offsets(mEnv, javaOffsets); 87 if (offsets.get() == NULL) { 88 return; 89 } 90 91 for (size_t i = 0, groupCount = mMatcher->groupCount(); i <= groupCount; ++i) { 92 offsets[2*i + 0] = mMatcher->start(i, mStatus); 93 offsets[2*i + 1] = mMatcher->end(i, mStatus); 94 } 95 } 96 97 private: 98 void init(JNIEnv* env, jlong address) { 99 mEnv = env; 100 mJavaInput = NULL; 101 mMatcher = toRegexMatcher(address); 102 mChars = NULL; 103 mStatus = U_ZERO_ERROR; 104 mUText = NULL; 105 } 106 107 JNIEnv* mEnv; 108 jstring mJavaInput; 109 icu::RegexMatcher* mMatcher; 110 const jchar* mChars; 111 UErrorCode mStatus; 112 UText* mUText; 113 114 // Disallow copy and assignment. 115 MatcherAccessor(const MatcherAccessor&); 116 void operator=(const MatcherAccessor&); 117 }; 118 119 static void Matcher_closeImpl(JNIEnv*, jclass, jlong address) { 120 delete toRegexMatcher(address); 121 } 122 123 static jint Matcher_findImpl(JNIEnv* env, jclass, jlong addr, jstring javaText, jint startIndex, jintArray offsets) { 124 MatcherAccessor matcher(env, addr, javaText, false); 125 UBool result = matcher->find(startIndex, matcher.status()); 126 if (result) { 127 matcher.updateOffsets(offsets); 128 } 129 return result; 130 } 131 132 static jint Matcher_findNextImpl(JNIEnv* env, jclass, jlong addr, jstring javaText, jintArray offsets) { 133 MatcherAccessor matcher(env, addr, javaText, false); 134 if (matcher.status() != U_ZERO_ERROR) { 135 return -1; 136 } 137 UBool result = matcher->find(); 138 if (result) { 139 matcher.updateOffsets(offsets); 140 } 141 return result; 142 } 143 144 static jint Matcher_groupCountImpl(JNIEnv* env, jclass, jlong addr) { 145 MatcherAccessor matcher(env, addr); 146 return matcher->groupCount(); 147 } 148 149 static jint Matcher_hitEndImpl(JNIEnv* env, jclass, jlong addr) { 150 MatcherAccessor matcher(env, addr); 151 return matcher->hitEnd(); 152 } 153 154 static jint Matcher_lookingAtImpl(JNIEnv* env, jclass, jlong addr, jstring javaText, jintArray offsets) { 155 MatcherAccessor matcher(env, addr, javaText, false); 156 UBool result = matcher->lookingAt(matcher.status()); 157 if (result) { 158 matcher.updateOffsets(offsets); 159 } 160 return result; 161 } 162 163 static jint Matcher_matchesImpl(JNIEnv* env, jclass, jlong addr, jstring javaText, jintArray offsets) { 164 MatcherAccessor matcher(env, addr, javaText, false); 165 UBool result = matcher->matches(matcher.status()); 166 if (result) { 167 matcher.updateOffsets(offsets); 168 } 169 return result; 170 } 171 172 static jlong Matcher_openImpl(JNIEnv* env, jclass, jlong patternAddr) { 173 icu::RegexPattern* pattern = reinterpret_cast<icu::RegexPattern*>(static_cast<uintptr_t>(patternAddr)); 174 UErrorCode status = U_ZERO_ERROR; 175 icu::RegexMatcher* result = pattern->matcher(status); 176 maybeThrowIcuException(env, "RegexPattern::matcher", status); 177 return reinterpret_cast<uintptr_t>(result); 178 } 179 180 static jint Matcher_requireEndImpl(JNIEnv* env, jclass, jlong addr) { 181 MatcherAccessor matcher(env, addr); 182 return matcher->requireEnd(); 183 } 184 185 static void Matcher_setInputImpl(JNIEnv* env, jclass, jlong addr, jstring javaText, jint start, jint end) { 186 MatcherAccessor matcher(env, addr, javaText, true); 187 matcher->region(start, end, matcher.status()); 188 } 189 190 static void Matcher_useAnchoringBoundsImpl(JNIEnv* env, jclass, jlong addr, jboolean value) { 191 MatcherAccessor matcher(env, addr); 192 matcher->useAnchoringBounds(value); 193 } 194 195 static void Matcher_useTransparentBoundsImpl(JNIEnv* env, jclass, jlong addr, jboolean value) { 196 MatcherAccessor matcher(env, addr); 197 matcher->useTransparentBounds(value); 198 } 199 200 static JNINativeMethod gMethods[] = { 201 NATIVE_METHOD(Matcher, closeImpl, "(J)V"), 202 NATIVE_METHOD(Matcher, findImpl, "(JLjava/lang/String;I[I)Z"), 203 NATIVE_METHOD(Matcher, findNextImpl, "(JLjava/lang/String;[I)Z"), 204 NATIVE_METHOD(Matcher, groupCountImpl, "(J)I"), 205 NATIVE_METHOD(Matcher, hitEndImpl, "(J)Z"), 206 NATIVE_METHOD(Matcher, lookingAtImpl, "(JLjava/lang/String;[I)Z"), 207 NATIVE_METHOD(Matcher, matchesImpl, "(JLjava/lang/String;[I)Z"), 208 NATIVE_METHOD(Matcher, openImpl, "(J)J"), 209 NATIVE_METHOD(Matcher, requireEndImpl, "(J)Z"), 210 NATIVE_METHOD(Matcher, setInputImpl, "(JLjava/lang/String;II)V"), 211 NATIVE_METHOD(Matcher, useAnchoringBoundsImpl, "(JZ)V"), 212 NATIVE_METHOD(Matcher, useTransparentBoundsImpl, "(JZ)V"), 213 }; 214 void register_java_util_regex_Matcher(JNIEnv* env) { 215 jniRegisterNativeMethods(env, "java/util/regex/Matcher", gMethods, NELEM(gMethods)); 216 } 217
