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/*
* Copyright (C) 2010 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.
*/
#define LOG_TAG "Pattern"
#include <stdlib.h>
#include "JNIHelp.h"
#include "JniConstants.h"
#include "ScopedJavaUnicodeString.h"
#include "jni.h"
#include "unicode/parseerr.h"
#include "unicode/regex.h"
// ICU documentation: http://icu-project.org/apiref/icu4c/classRegexPattern.html
static RegexPattern* toRegexPattern(jlong addr) {
return reinterpret_cast<RegexPattern*>(static_cast<uintptr_t>(addr));
}
static const char* regexDetailMessage(UErrorCode status) {
// These human-readable error messages were culled from "utypes.h", and then slightly tuned
// to make more sense in context.
// If we don't have a special-case, we'll just return the textual name of
// the enum value (such as U_REGEX_RULE_SYNTAX), which is better than nothing.
switch (status) {
case U_REGEX_INTERNAL_ERROR: return "An internal error was detected";
case U_REGEX_RULE_SYNTAX: return "Syntax error in regexp pattern";
case U_REGEX_INVALID_STATE: return "Matcher in invalid state for requested operation";
case U_REGEX_BAD_ESCAPE_SEQUENCE: return "Unrecognized backslash escape sequence in pattern";
case U_REGEX_PROPERTY_SYNTAX: return "Incorrect Unicode property";
case U_REGEX_UNIMPLEMENTED: return "Use of unimplemented feature";
case U_REGEX_MISMATCHED_PAREN: return "Incorrectly nested parentheses in regexp pattern";
case U_REGEX_NUMBER_TOO_BIG: return "Decimal number is too large";
case U_REGEX_BAD_INTERVAL: return "Error in {min,max} interval";
case U_REGEX_MAX_LT_MIN: return "In {min,max}, max is less than min";
case U_REGEX_INVALID_BACK_REF: return "Back-reference to a non-existent capture group";
case U_REGEX_INVALID_FLAG: return "Invalid value for match mode flags";
case U_REGEX_LOOK_BEHIND_LIMIT: return "Look-behind pattern matches must have a bounded maximum length";
case U_REGEX_SET_CONTAINS_STRING: return "Regular expressions cannot have UnicodeSets containing strings";
case U_REGEX_OCTAL_TOO_BIG: return "Octal character constants must be <= 0377.";
case U_REGEX_MISSING_CLOSE_BRACKET: return "Missing closing bracket in character class";
case U_REGEX_INVALID_RANGE: return "In a character range [x-y], x is greater than y";
case U_REGEX_STACK_OVERFLOW: return "Regular expression backtrack stack overflow";
case U_REGEX_TIME_OUT: return "Maximum allowed match time exceeded";
case U_REGEX_STOPPED_BY_CALLER: return "Matching operation aborted by user callback function";
default:
return u_errorName(status);
}
}
static void throwPatternSyntaxException(JNIEnv* env, UErrorCode status, jstring pattern, UParseError error) {
static jmethodID method = env->GetMethodID(JniConstants::patternSyntaxExceptionClass,
"<init>", "(Ljava/lang/String;Ljava/lang/String;I)V");
jstring message = env->NewStringUTF(regexDetailMessage(status));
jclass exceptionClass = JniConstants::patternSyntaxExceptionClass;
jobject exception = env->NewObject(exceptionClass, method, message, pattern, error.offset);
env->Throw(reinterpret_cast<jthrowable>(exception));
}
static void Pattern_closeImpl(JNIEnv*, jclass, jlong addr) {
delete toRegexPattern(addr);
}
static jlong Pattern_compileImpl(JNIEnv* env, jclass, jstring javaRegex, jint flags) {
flags |= UREGEX_ERROR_ON_UNKNOWN_ESCAPES;
UErrorCode status = U_ZERO_ERROR;
UParseError error;
error.offset = -1;
ScopedJavaUnicodeString regex(env, javaRegex);
if (!regex.valid()) {
return 0;
}
UnicodeString& regexString(regex.unicodeString());
RegexPattern* result = RegexPattern::compile(regexString, flags, error, status);
if (!U_SUCCESS(status)) {
throwPatternSyntaxException(env, status, javaRegex, error);
}
return static_cast<jlong>(reinterpret_cast<uintptr_t>(result));
}
static JNINativeMethod gMethods[] = {
NATIVE_METHOD(Pattern, closeImpl, "(J)V"),
NATIVE_METHOD(Pattern, compileImpl, "(Ljava/lang/String;I)J"),
};
void register_java_util_regex_Pattern(JNIEnv* env) {
jniRegisterNativeMethods(env, "java/util/regex/Pattern", gMethods, NELEM(gMethods));
}
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