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// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "components/spellcheck/renderer/spellcheck_language.h"
#include <string_view>
#include <utility>
#include "base/logging.h"
#include "components/spellcheck/renderer/spellcheck_worditerator.h"
#include "components/spellcheck/renderer/spelling_engine.h"
SpellcheckLanguage::SpellcheckLanguage(
service_manager::LocalInterfaceProvider* embedder_provider)
: platform_spelling_engine_(CreateNativeSpellingEngine(embedder_provider)) {
}
SpellcheckLanguage::~SpellcheckLanguage() = default;
void SpellcheckLanguage::Init(base::File file, const std::string& language) {
DCHECK(platform_spelling_engine_);
platform_spelling_engine_->Init(std::move(file));
character_attributes_.SetDefaultLanguage(language);
text_iterator_.Reset();
contraction_iterator_.Reset();
}
bool SpellcheckLanguage::InitializeIfNeeded() {
DCHECK(platform_spelling_engine_);
return platform_spelling_engine_->InitializeIfNeeded();
}
SpellcheckLanguage::SpellcheckWordResult SpellcheckLanguage::SpellCheckWord(
std::u16string_view text,
spellcheck::mojom::SpellCheckHost& host,
size_t* skip_or_misspelling_start,
size_t* skip_or_misspelling_len,
std::vector<std::u16string>* optional_suggestions) {
DCHECK(skip_or_misspelling_start && skip_or_misspelling_len)
<< "Out vars must be given.";
// Do nothing if we need to delay initialization. (Rather than blocking,
// report the word as correctly spelled.)
if (InitializeIfNeeded())
return IS_CORRECT;
// Do nothing if spell checking is disabled.
if (!platform_spelling_engine_ || !platform_spelling_engine_->IsEnabled())
return IS_CORRECT;
*skip_or_misspelling_start = 0;
*skip_or_misspelling_len = 0;
if (text.empty()) {
return IS_CORRECT; // No input means always spelled correctly.
}
std::u16string word;
size_t word_start;
size_t word_length;
if (!text_iterator_.IsInitialized() &&
!text_iterator_.Initialize(&character_attributes_, true)) {
// We failed to initialize text_iterator_, return as spelled correctly.
VLOG(1) << "Failed to initialize SpellcheckWordIterator";
return IS_CORRECT;
}
text_iterator_.SetText(text);
DCHECK(platform_spelling_engine_);
for (SpellcheckWordIterator::WordIteratorStatus status =
text_iterator_.GetNextWord(&word, &word_start, &word_length);
status != SpellcheckWordIterator::IS_END_OF_TEXT;
status = text_iterator_.GetNextWord(&word, &word_start, &word_length)) {
// Found a character that is not able to be spellchecked so determine how
// long the sequence of uncheckable characters is and then return.
if (status == SpellcheckWordIterator::IS_SKIPPABLE) {
*skip_or_misspelling_start = word_start;
while (status == SpellcheckWordIterator::IS_SKIPPABLE) {
*skip_or_misspelling_len += word_length;
status = text_iterator_.GetNextWord(&word, &word_start, &word_length);
}
return IS_SKIPPABLE;
}
// Found a word (or a contraction) that the spellchecker can check the
// spelling of.
if (platform_spelling_engine_->CheckSpelling(word, host)) {
continue;
}
// If the given word is a concatenated word of two or more valid words
// (e.g. "hello:hello"), we should treat it as a valid word.
if (IsValidContraction(word, host)) {
continue;
}
*skip_or_misspelling_start = word_start;
*skip_or_misspelling_len = word_length;
// Get the list of suggested words.
if (optional_suggestions) {
platform_spelling_engine_->FillSuggestionList(word, host,
optional_suggestions);
}
return IS_MISSPELLED;
}
return IS_CORRECT;
}
// Returns whether or not the given string is a valid contraction.
// This function is a fall-back when the SpellcheckWordIterator class
// returns a concatenated word which is not in the selected dictionary
// (e.g. "in'n'out") but each word is valid.
bool SpellcheckLanguage::IsValidContraction(
const std::u16string& contraction,
spellcheck::mojom::SpellCheckHost& host) {
if (!contraction_iterator_.IsInitialized() &&
!contraction_iterator_.Initialize(&character_attributes_, false)) {
// We failed to initialize the word iterator, return as spelled correctly.
VLOG(1) << "Failed to initialize contraction_iterator_";
return true;
}
contraction_iterator_.SetText(contraction);
std::u16string word;
size_t word_start;
size_t word_length;
DCHECK(platform_spelling_engine_);
for (SpellcheckWordIterator::WordIteratorStatus status =
contraction_iterator_.GetNextWord(&word, &word_start, &word_length);
status != SpellcheckWordIterator::IS_END_OF_TEXT;
status = contraction_iterator_.GetNextWord(&word, &word_start,
&word_length)) {
if (status == SpellcheckWordIterator::IS_SKIPPABLE)
continue;
if (!platform_spelling_engine_->CheckSpelling(word, host)) {
return false;
}
}
return true;
}
bool SpellcheckLanguage::IsEnabled() {
DCHECK(platform_spelling_engine_);
return platform_spelling_engine_->IsEnabled();
}
bool SpellcheckLanguage::IsTextInSameScript(const std::u16string& text) const {
return character_attributes_.IsTextInSameScript(text);
}
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