autocompletion.cpp

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/*
 * This file is part of OpenTTD.
 * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
 * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
 */
 
#include "stdafx.h"
 
#include "autocompletion.h"
 
#include "console_internal.h"
#include "town.h"
#include "network/network_base.h"
 
#include "safeguards.h"
 
bool AutoCompletion::AutoComplete()
{
  // We are pressing TAB for the first time after reset.
  if (this->suggestions.empty()) {
    this->InitSuggestions(this->textbuf->buf);
    if (this->suggestions.empty()) {
      return false;
    }
    this->ApplySuggestion(prefix, suggestions[0]);
    return true;
  }
 
  // We are pressing TAB again on the same text.
  if (this->current_suggestion_index + 1 < this->suggestions.size()) {
    this->ApplySuggestion(prefix, this->suggestions[++this->current_suggestion_index]);
  } else {
    // We are out of options, restore original text.
    this->textbuf->Assign(initial_buf);
    this->Reset();
  }
  return true;
}
 
void AutoCompletion::Reset()
{
  this->prefix = "";
  this->query = "";
  this->initial_buf.clear();
  this->suggestions.clear();
  this->current_suggestion_index = 0;
}
 
void AutoCompletion::InitSuggestions(std::string_view text)
{
  this->initial_buf = text;
  size_t space_pos = this->initial_buf.find_last_of(' ');
  this->query = this->initial_buf;
  if (space_pos == std::string::npos) {
    this->prefix = "";
  } else {
    this->prefix = this->query.substr(0, space_pos + 1);
    this->query.remove_prefix(space_pos + 1);
  }
 
  this->suggestions = this->GetSuggestions(prefix, query);
  this->current_suggestion_index = 0;
}