[WIP][DO NOT LAND] Componentize spellcheck

chrome/renderer/spellchecker/spellcheck_language.cc

-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "chrome/renderer/spellchecker/spellcheck_language.h"
-
-#include <utility>
-
-#include "base/logging.h"
-#include "chrome/renderer/spellchecker/spellcheck_worditerator.h"
-#include "chrome/renderer/spellchecker/spelling_engine.h"
-
-
-SpellcheckLanguage::SpellcheckLanguage()
-    : platform_spelling_engine_(CreateNativeSpellingEngine()) {
-}
-
-SpellcheckLanguage::~SpellcheckLanguage() {
-}
-
-void SpellcheckLanguage::Init(base::File file, const std::string& language) {
-  DCHECK(platform_spelling_engine_.get());
-  platform_spelling_engine_->Init(std::move(file));
-
-  character_attributes_.SetDefaultLanguage(language);
-  text_iterator_.Reset();
-  contraction_iterator_.Reset();
-}
-
-bool SpellcheckLanguage::InitializeIfNeeded() {
-  DCHECK(platform_spelling_engine_.get());
-  return platform_spelling_engine_->InitializeIfNeeded();
-}
-
-SpellcheckLanguage::SpellcheckWordResult SpellcheckLanguage::SpellCheckWord(
-    const base::char16* text_begin,
-    int position_in_text,
-    int text_length,
-    int tag,
-    int* skip_or_misspelling_start,
-    int* skip_or_misspelling_len,
-    std::vector<base::string16>* optional_suggestions) {
-  int remaining_text_len = text_length - position_in_text;
-  DCHECK(remaining_text_len >= 0);
-  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_.get() ||
-      !platform_spelling_engine_->IsEnabled())
-    return IS_CORRECT;
-
-  *skip_or_misspelling_start = 0;
-  *skip_or_misspelling_len = 0;
-  if (remaining_text_len == 0)
-    return IS_CORRECT;  // No input means always spelled correctly.
-
-  base::string16 word;
-  int word_start;
-  int 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_begin + position_in_text, remaining_text_len);
-  DCHECK(platform_spelling_engine_.get());
-  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 = position_in_text + 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, tag))
-      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, tag))
-      continue;
-
-    *skip_or_misspelling_start = position_in_text + word_start;
-    *skip_or_misspelling_len = word_length;
-
-    // Get the list of suggested words.
-    if (optional_suggestions) {
-      platform_spelling_engine_->FillSuggestionList(word,
-                                                    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 base::string16& contraction,
-                                            int tag) {
-  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.c_str(), contraction.length());
-
-  base::string16 word;
-  int word_start;
-  int word_length;
-
-  DCHECK(platform_spelling_engine_.get());
-  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, tag))
-      return false;
-  }
-  return true;
-}
-
-bool SpellcheckLanguage::IsEnabled() {
-  DCHECK(platform_spelling_engine_.get());
-  return platform_spelling_engine_->IsEnabled();
-}