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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
#include "mozEnglishWordUtils.h"
#include "nsComponentManagerUtils.h"
#include "nsReadableUtils.h"
#include "nsUnicharUtils.h"
#include "nsUnicodeProperties.h"
#include "nsCRT.h"
#include "mozilla/Likely.h"
NS_IMPL_CYCLE_COLLECTION(mozEnglishWordUtils, mURLDetector)
mozEnglishWordUtils::mozEnglishWordUtils() {
mURLDetector = do_CreateInstance(MOZ_TXTTOHTMLCONV_CONTRACTID);
}
mozEnglishWordUtils::~mozEnglishWordUtils() {}
// This needs vast improvement
// static
bool mozEnglishWordUtils::ucIsAlpha(char16_t aChar) {
// XXX we have to fix callers to handle the full Unicode range
return nsUGenCategory::kLetter == mozilla::unicode::GetGenCategory(aChar);
}
bool mozEnglishWordUtils::FindNextWord(const nsAString& aWord, uint32_t offset,
int32_t* begin, int32_t* end) {
if (offset >= aWord.Length()) {
*begin = -1;
*end = -1;
return false;
}
const char16_t* word = aWord.BeginReading();
uint32_t length = aWord.Length();
const char16_t* p = word + offset;
const char16_t* endbuf = word + length;
const char16_t* startWord = p;
// XXX These loops should be modified to handle non-BMP characters.
// if previous character is a word character, need to advance out of the
// word
if (offset > 0 && ucIsAlpha(*(p - 1))) {
while (p < endbuf && ucIsAlpha(*p)) {
p++;
}
}
while ((p < endbuf) && (!ucIsAlpha(*p))) {
p++;
}
startWord = p;
while ((p < endbuf) && ((ucIsAlpha(*p)) || (*p == '\''))) {
p++;
}
// we could be trying to break down a url, we don't want to break a url into
// parts, instead we want to find out if it really is a url and if so, skip
// it, advancing startWord to a point after the url.
// before we spend more time looking to see if the word is a url, look for a
// url identifer and make sure that identifer isn't the last character in
// the word fragment.
if ((p < endbuf - 1) && (*p == ':' || *p == '@' || *p == '.')) {
// ok, we have a possible url...do more research to find out if we really
// have one and determine the length of the url so we can skip over it.
if (mURLDetector) {
int32_t startPos = -1;
int32_t endPos = -1;
mURLDetector->FindURLInPlaintext(startWord, endbuf - startWord,
p - startWord, &startPos, &endPos);
// ok, if we got a url, adjust the array bounds, skip the current url
// text and find the next word again
if (startPos != -1 && endPos != -1) {
startWord = p + endPos + 1; // skip over the url
// now recursively call FindNextWord to search for the next word now
// that we have skipped the url
return FindNextWord(aWord, startWord - word, begin, end);
}
}
}
while ((p > startWord) && (*(p - 1) == '\'')) { // trim trailing apostrophes
p--;
}
if (startWord == endbuf) {
*begin = -1;
*end = -1;
return false;
}
*begin = startWord - word;
*end = p - word;
return true;
}