Editline kitaplığı (ve GNU readline) yalnızca terminal yetenekleriyle çalışır. Bu kütüphaneleri oyun içi konsolunuzla kullanmak için önce bir terminal öykünücüsü (TTY) uygulamanız gerekir .
Bunun yerine (bir oyun için bunu yapmak çılgınca olacağından), imleç hareketlerini uygulamanızı ve kendinizi düzenlemenizi tavsiye ederim. Bir keresinde, bunu tam olarak bu amaç için kendi oyun konsolumda işlemek için bir C ++ sınıfı yazdım. Sınıf uygun şekilde EditLine olarak adlandırılır. Sınıf temel imleç hareketlerini, ileri / geri karakter / sözcük / satır silmeleri ve geçmişi işler. Hiçbir şey fantezi, ama yararlı bulabilirsiniz. Belgeler seyrek veya yok, umarım anlayabilirsiniz. Maalesef otomatik tamamlama yok. Bunu bu sınıfı kullanarak bir üst katmana uyguladım.
editline.h
#include <string>
#include <vector>
class EditLine {
public:
EditLine();
EditLine(const EditLine&);
~EditLine();
// assignment operator
EditLine& operator=(const EditLine&);
// comparison operators
bool operator==(const EditLine&) const;
bool operator!=(const EditLine&) const;
// edit commands
void accept_line();
void reject_line();
void insert_char(int);
void delete_char();
void backward_delete_char();
void delete_word();
void backward_delete_word();
void delete_line();
// motion commands
void beginning_of_line();
void end_of_line();
void forward_char();
void backward_char();
void forward_word();
void backward_word();
// history commands
void next_history();
void previous_history();
// accessors
int history_pos() const;
inline size_t history_size() const;
inline bool empty() const;
inline const std::string& line() const;
inline size_t length() const;
inline const std::string::size_type& cursor_pos() const;
// mutators
void set_line(const std::string& s);
void set_cursor_pos(std::string::size_type);
void reset_line();
private:
std::string line_;
std::string::size_type cursor_pos_;
std::vector< std::string > history_;
std::vector< std::string >::iterator last_iter_;
};
inline size_t EditLine::history_size() const { return history_.size(); }
inline const std::string& EditLine::line() const { return line_; }
inline const std::string::size_type& EditLine::cursor_pos() const { return cursor_pos_; }
inline bool EditLine::empty() const { return line_.empty(); }
inline size_t EditLine::length() const { return line_.length(); }
editline.cpp
#include "editline.h"
#include "string_utils.h"
#include <string>
namespace {
const std::string word_delims = " !@#$%^&*()+-={}[]:\"|;'\\<>?,./";
} // namespace
EditLine::EditLine()
: line_(std::string()),
cursor_pos_(0),
last_iter_(history_.end())
{
}
EditLine::EditLine(const EditLine& rhs)
{
*this = rhs;
}
EditLine::~EditLine()
{
}
EditLine& EditLine::operator=(const EditLine& rhs)
{
line_ = rhs.line_;
cursor_pos_ = rhs.cursor_pos_;
history_ = rhs.history_;
if (rhs.last_iter_ == rhs.history_.end())
last_iter_ = history_.end();
else {
last_iter_ = history_.begin();
std::advance(last_iter_, rhs.last_iter_ - rhs.history_.begin());
}
return *this;
}
void EditLine::set_line(const std::string& s)
{
line_ = s;
cursor_pos_ = line_.size();
}
void EditLine::set_cursor_pos(std::string::size_type pos)
{
if (pos > line_.size())
pos = line_.size();
cursor_pos_ = pos;
}
void EditLine::reset_line()
{
line_.clear();
cursor_pos_ = 0;
}
bool EditLine::operator==(const EditLine& rhs) const
{
return (line_ == rhs.line_ &&
cursor_pos_ == rhs.cursor_pos_ &&
history_ == rhs.history_ &&
history_pos() == rhs.history_pos());
}
bool EditLine::operator!=(const EditLine& rhs) const
{
return !operator==(rhs);
}
void EditLine::accept_line()
{
if (!line_.empty())
history_.push_back(line_);
line_.clear();
cursor_pos_ = 0;
last_iter_ = history_.end();
}
void EditLine::reject_line()
{
line_.clear();
cursor_pos_ = 0;
last_iter_ = history_.end();
}
void EditLine::insert_char(int c)
{
line_.insert(cursor_pos_, 1, c);
cursor_pos_++;
}
void EditLine::delete_char()
{
line_.erase(cursor_pos_, 1);
}
void EditLine::backward_delete_char()
{
if (cursor_pos_ > 0) {
line_.erase(cursor_pos_ - 1, 1);
cursor_pos_--;
}
}
void EditLine::delete_word()
{
std::string::size_type pos;
// check if cursor points on a word delim
if (word_delims.find(line_[cursor_pos_]) != std::string::npos) {
// cursor points on a word delim - remove everything from here to
// right up to first delim after this word.
pos = line_.find_first_not_of(word_delims, cursor_pos_+1);
if (pos != std::string::npos)
pos = line_.find_first_of(word_delims, pos+1);
} else {
// cursor is in the middle of a word - remove everything up to first
// delim.
pos = line_.find_first_of(word_delims, cursor_pos_+1);
}
if (pos != std::string::npos)
// removes everything right of cursor up to 'pos'
line_.replace(cursor_pos_, pos - cursor_pos_, "");
else
// removes everthing right of cursor
line_.erase(cursor_pos_);
}
void EditLine::backward_delete_word()
{
std::string::size_type pos;
if (cursor_pos_ == 0) return;
// check if char left of cursor is a word delim
if (word_delims.find(line_[cursor_pos_-1]) != std::string::npos) {
// left of cursor is a word delim - remove everything from left of
// cursor up to next word delim before current word.
pos = rfind_first_not_of(line_, word_delims, cursor_pos_-1);
if (pos != std::string::npos)
pos = rfind_first_of(line_, word_delims, pos);
} else {
// left of cursor is not a word delim - remove everything left of
// cursor up to next word delim.
pos = rfind_first_of(line_, word_delims, cursor_pos_-1);
}
if (pos != std::string::npos) {
// removes from right of pos and up to cursor
line_.erase(pos + 1, cursor_pos_ - pos - 1);
cursor_pos_ = pos + 1;
} else {
// removes everything from beginning up to cursor
line_.erase(0, cursor_pos_);
cursor_pos_ = 0;
}
}
void EditLine::delete_line()
{
line_.erase(cursor_pos_);
cursor_pos_ = line_.size();
}
void EditLine::beginning_of_line()
{
cursor_pos_ = 0;
}
void EditLine::end_of_line()
{
cursor_pos_ = line_.size();
}
void EditLine::forward_char()
{
if (cursor_pos_ < line_.size())
cursor_pos_++;
}
void EditLine::backward_char()
{
if (cursor_pos_ > 0)
cursor_pos_--;
}
void EditLine::forward_word()
{
std::string::size_type pos;
pos = line_.find_first_of(word_delims, cursor_pos_);
if (pos != std::string::npos)
cursor_pos_ = pos + 1;
else
cursor_pos_ = line_.size();
}
void EditLine::backward_word()
{
if (cursor_pos_ <= 1) {
cursor_pos_ = 0;
return;
}
std::string::size_type pos, cursor_pos;
cursor_pos = cursor_pos_;
if (cursor_pos >= 2)
cursor_pos -= 2;
bool found = false;
for (int i = (int) cursor_pos; i >= 0; --i) {
if (word_delims.find(line_[i]) != std::string::npos) {
pos = (std::string::size_type) i;
found = true;
break;
}
}
if (found)
cursor_pos_ = pos + 1;
else
cursor_pos_ = 0;
}
void EditLine::next_history()
{
if (!history_.empty()) {
if (last_iter_ == history_.end() || ++last_iter_ == history_.end())
last_iter_ = history_.begin();
line_ = *last_iter_;
cursor_pos_ = line_.size();
}
}
void EditLine::previous_history()
{
if (!history_.empty()) {
if (last_iter_ != history_.begin())
--last_iter_;
else
last_iter_ = --history_.end();
line_ = *last_iter_;
cursor_pos_ = line_.size();
}
}
int EditLine::history_pos() const
{
if (last_iter_ == history_.end())
return -1;
return last_iter_ - history_.begin();
}
string_utils.h
std::string::size_type rfind_first_not_of(const std::string& s,
const std::string& delims,
std::string::size_type pos);
std::string::size_type rfind_first_of(const std::string& s,
const std::string& delims,
std::string::size_type pos);
string_utils.cpp
std::string::size_type rfind_first_not_of(const std::string& s,
const std::string& delims, std::string::size_type pos)
{
std::string::size_type p = pos;
while (delims.find(s[p]) != std::string::npos) {
if (p == 0) // not found
return std::string::npos;
--p;
}
return p;
}
std::string::size_type rfind_first_of(const std::string& s,
const std::string& delims, std::string::size_type pos)
{
std::string::size_type p = pos;
while (delims.find(s[p]) == std::string::npos) {
if (p == 0) // not found
return std::string::npos;
--p;
}
return p;
}