int msc_regexec_ex(RE2 &re, const char *s, unsigned int slen,
int startoffset, int *ovector, int ovecsize)
{
size_t startpos = startoffset;
const size_t endpos = slen;
// Total # of submatches in the regex pattern
int num_submatch = 1 + re.NumberOfCapturingGroups();
// Index of the last non empty submatch
int last_nonempty_submatch = num_submatch - 1;
re2::StringPiece submatches[num_submatch];
// If the string does not match the pattern
if (!re.Match(s, startpos, endpos, RE2::UNANCHORED, submatches, num_submatch)) {
return -1;
}
// Find the last non empty submatch
while (!submatches[last_nonempty_submatch].data()) {
last_nonempty_submatch--;
}
int count = min(last_nonempty_submatch + 1, ovecsize / 3);
// Extract submatch information as much as possible
for (int i = 0; i < count; i++) {
// An empty submatch
if (!submatches[i].data()) {
ovector[2 * i] = -1;
ovector[2 * i + 1] = -1;
} else {
ovector[2 * i] = submatches[i].data() - s;
ovector[2 * i + 1] = ovector[2 * i] + submatches[i].length();
}
}
// The output vector has enough space to store the information of
// all non empty submatches + empty submatches among non empty submatches
if (last_nonempty_submatch + 1 <= ovecsize / 3) {
return last_nonempty_submatch + 1;
}
// Truncate empty submatches at the tail of 'ovector'
if (!submatches[ovecsize / 3 - 1].data()) {
for (int i = ovecsize / 3 - 2; i >= 0; i--) {
if (submatches[i].data()) {
return i + 1;
}
}
}
return 0;
}
JNIEXPORT jboolean JNICALL Java_com_logentries_re2_RE2Matcher_findImpl
(JNIEnv *env, jclass cls, jobject matcher, jlong re2_pointer, jlong str_pointer, jint ngroups, jint start, jint end) {
RE2 *regex = reinterpret_cast<RE2*>(re2_pointer);
char *str = reinterpret_cast<char*>(str_pointer);
StringPiece* groups;
StringPiece stackgroups[stackSize];
StringPiece* heapgroups = NULL;
if (ngroups <= stackSize) {
groups = stackgroups;
} else {
groups = new StringPiece[ngroups];
heapgroups = groups;
}
StringPiece text(str);
const bool res = regex->Match(text, start, end, RE2::UNANCHORED, groups, ngroups);
if (res) {
jclass matcher_class = env->FindClass("com/logentries/re2/RE2Matcher");
jmethodID addID = env->GetStaticMethodID(matcher_class, "addGroup", "(Lcom/logentries/re2/RE2Matcher;II)V");
for (int i=0; i<ngroups; i++) {
if (groups[i] != NULL) {
env->CallStaticObjectMethod(
matcher_class,
addID,
matcher,
static_cast<jint>(groups[i].data() - str),
static_cast<jint>(groups[i].data() - str + groups[i].size())
);
} else {
env->CallStaticObjectMethod(matcher_class, addID,
matcher, static_cast<jint>(-1), static_cast<jint>(-1));
}
}
}
delete[] heapgroups;
return static_cast<jboolean>(res);
}
