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 "Pattern" 18 19 #include <stdlib.h> 20 21 #include "JNIHelp.h" 22 #include "JniConstants.h" 23 #include "ScopedJavaUnicodeString.h" 24 #include "jni.h" 25 #include "unicode/parseerr.h" 26 #include "unicode/regex.h" 27 28 // ICU documentation: http://icu-project.org/apiref/icu4c/classRegexPattern.html 29 30 static RegexPattern* toRegexPattern(jlong addr) { 31 return reinterpret_cast<RegexPattern*>(static_cast<uintptr_t>(addr)); 32 } 33 34 static const char* regexDetailMessage(UErrorCode status) { 35 // These human-readable error messages were culled from "utypes.h", and then slightly tuned 36 // to make more sense in context. 37 // If we don't have a special-case, we'll just return the textual name of 38 // the enum value (such as U_REGEX_RULE_SYNTAX), which is better than nothing. 39 switch (status) { 40 case U_REGEX_INTERNAL_ERROR: return "An internal error was detected"; 41 case U_REGEX_RULE_SYNTAX: return "Syntax error in regexp pattern"; 42 case U_REGEX_INVALID_STATE: return "Matcher in invalid state for requested operation"; 43 case U_REGEX_BAD_ESCAPE_SEQUENCE: return "Unrecognized backslash escape sequence in pattern"; 44 case U_REGEX_PROPERTY_SYNTAX: return "Incorrect Unicode property"; 45 case U_REGEX_UNIMPLEMENTED: return "Use of unimplemented feature"; 46 case U_REGEX_MISMATCHED_PAREN: return "Incorrectly nested parentheses in regexp pattern"; 47 case U_REGEX_NUMBER_TOO_BIG: return "Decimal number is too large"; 48 case U_REGEX_BAD_INTERVAL: return "Error in {min,max} interval"; 49 case U_REGEX_MAX_LT_MIN: return "In {min,max}, max is less than min"; 50 case U_REGEX_INVALID_BACK_REF: return "Back-reference to a non-existent capture group"; 51 case U_REGEX_INVALID_FLAG: return "Invalid value for match mode flags"; 52 case U_REGEX_LOOK_BEHIND_LIMIT: return "Look-behind pattern matches must have a bounded maximum length"; 53 case U_REGEX_SET_CONTAINS_STRING: return "Regular expressions cannot have UnicodeSets containing strings"; 54 case U_REGEX_OCTAL_TOO_BIG: return "Octal character constants must be <= 0377."; 55 case U_REGEX_MISSING_CLOSE_BRACKET: return "Missing closing bracket in character class"; 56 case U_REGEX_INVALID_RANGE: return "In a character range [x-y], x is greater than y"; 57 case U_REGEX_STACK_OVERFLOW: return "Regular expression backtrack stack overflow"; 58 case U_REGEX_TIME_OUT: return "Maximum allowed match time exceeded"; 59 case U_REGEX_STOPPED_BY_CALLER: return "Matching operation aborted by user callback function"; 60 default: 61 return u_errorName(status); 62 } 63 } 64 65 static void throwPatternSyntaxException(JNIEnv* env, UErrorCode status, jstring pattern, UParseError error) { 66 static jmethodID method = env->GetMethodID(JniConstants::patternSyntaxExceptionClass, 67 "<init>", "(Ljava/lang/String;Ljava/lang/String;I)V"); 68 jstring message = env->NewStringUTF(regexDetailMessage(status)); 69 jclass exceptionClass = JniConstants::patternSyntaxExceptionClass; 70 jobject exception = env->NewObject(exceptionClass, method, message, pattern, error.offset); 71 env->Throw(reinterpret_cast<jthrowable>(exception)); 72 } 73 74 static void Pattern_closeImpl(JNIEnv*, jclass, jlong addr) { 75 delete toRegexPattern(addr); 76 } 77 78 static jlong Pattern_compileImpl(JNIEnv* env, jclass, jstring javaRegex, jint flags) { 79 flags |= UREGEX_ERROR_ON_UNKNOWN_ESCAPES; 80 81 UErrorCode status = U_ZERO_ERROR; 82 UParseError error; 83 error.offset = -1; 84 85 ScopedJavaUnicodeString regex(env, javaRegex); 86 if (!regex.valid()) { 87 return 0; 88 } 89 UnicodeString& regexString(regex.unicodeString()); 90 RegexPattern* result = RegexPattern::compile(regexString, flags, error, status); 91 if (!U_SUCCESS(status)) { 92 throwPatternSyntaxException(env, status, javaRegex, error); 93 } 94 return static_cast<jlong>(reinterpret_cast<uintptr_t>(result)); 95 } 96 97 static JNINativeMethod gMethods[] = { 98 NATIVE_METHOD(Pattern, closeImpl, "(J)V"), 99 NATIVE_METHOD(Pattern, compileImpl, "(Ljava/lang/String;I)J"), 100 }; 101 void register_java_util_regex_Pattern(JNIEnv* env) { 102 jniRegisterNativeMethods(env, "java/util/regex/Pattern", gMethods, NELEM(gMethods)); 103 } 104