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/*
* Copyright (C) 2015 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 "Minikin"
#include <cutils/log.h>
#include "minikin/WordBreaker.h"
#include <unicode/uchar.h>
#include <unicode/utf16.h>
namespace android {
const uint32_t CHAR_SOFT_HYPHEN = 0x00AD;
void WordBreaker::setLocale(const icu::Locale& locale) {
UErrorCode status = U_ZERO_ERROR;
mBreakIterator.reset(icu::BreakIterator::createLineInstance(locale, status));
// TODO: handle failure status
if (mText != nullptr) {
mBreakIterator->setText(&mUText, status);
}
mIteratorWasReset = true;
}
void WordBreaker::setText(const uint16_t* data, size_t size) {
mText = data;
mTextSize = size;
mIteratorWasReset = false;
mLast = 0;
mCurrent = 0;
mScanOffset = 0;
mSuppressHyphen = false;
UErrorCode status = U_ZERO_ERROR;
utext_openUChars(&mUText, data, size, &status);
mBreakIterator->setText(&mUText, status);
mBreakIterator->first();
}
ssize_t WordBreaker::current() const {
return mCurrent;
}
enum ScanState {
START,
SAW_AT,
SAW_COLON,
SAW_COLON_SLASH,
SAW_COLON_SLASH_SLASH,
};
ssize_t WordBreaker::next() {
mLast = mCurrent;
// scan forward from current ICU position for email address or URL
if (mLast >= mScanOffset) {
ScanState state = START;
size_t i;
for (i = mLast; i < mTextSize; i++) {
uint16_t c = mText[i];
// scan only ASCII characters, stop at space
if (!(' ' < c && c <= 0x007E)) {
break;
}
if (state == START && c == '@') {
state = SAW_AT;
} else if (state == START && c == ':') {
state = SAW_COLON;
} else if (state == SAW_COLON || state == SAW_COLON_SLASH) {
if (c == '/') {
state = static_cast<ScanState>((int)state + 1); // next state adds a slash
} else {
state = START;
}
}
}
if (state == SAW_AT || state == SAW_COLON_SLASH_SLASH) {
// no line breaks in entire email address or url
// TODO: refine this according to Chicago Manual of Style rules
while (i < mTextSize && mText[i] == ' ') {
i++;
}
mCurrent = i;
mSuppressHyphen = true;
// Setting mIteratorWasReset will cause next break to be computed following
// mCurrent, rather than following the current ICU iterator location.
mIteratorWasReset = true;
if (mBreakIterator->isBoundary(mCurrent)) {
return mCurrent;
}
} else {
mScanOffset = i;
mSuppressHyphen = false;
}
}
int32_t result;
do {
if (mIteratorWasReset) {
result = mBreakIterator->following(mCurrent);
mIteratorWasReset = false;
} else {
result = mBreakIterator->next();
}
} while (result != icu::BreakIterator::DONE && (size_t)result != mTextSize
&& mText[result - 1] == CHAR_SOFT_HYPHEN);
mCurrent = (ssize_t)result;
return mCurrent;
}
ssize_t WordBreaker::wordStart() const {
if (mSuppressHyphen) {
return mLast;
}
ssize_t result = mLast;
while (result < mCurrent) {
UChar32 c;
ssize_t ix = result;
U16_NEXT(mText, ix, mCurrent, c);
int32_t lb = u_getIntPropertyValue(c, UCHAR_LINE_BREAK);
// strip leading punctuation, defined as OP and QU line breaking classes,
// see UAX #14
if (!(lb == U_LB_OPEN_PUNCTUATION || lb == U_LB_QUOTATION)) {
break;
}
result = ix;
}
return result;
}
ssize_t WordBreaker::wordEnd() const {
if (mSuppressHyphen) {
return mLast;
}
ssize_t result = mCurrent;
while (result > mLast) {
UChar32 c;
ssize_t ix = result;
U16_PREV(mText, mLast, ix, c);
int32_t gc_mask = U_GET_GC_MASK(c);
// strip trailing space and punctuation
if ((gc_mask & (U_GC_ZS_MASK | U_GC_P_MASK)) == 0) {
break;
}
result = ix;
}
return result;
}
void WordBreaker::finish() {
mText = nullptr;
// Note: calling utext_close multiply is safe
utext_close(&mUText);
}
} // namespace android
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