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Copy pathterminal_key_events.cpp
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366 lines (296 loc) · 9.98 KB
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/*
* .============.
* // M A K E / \
* // C++ DEV / \
* // E A S Y / \/ \
* ++ ----------. \/\ .
* \\ \ \ /\ /
* \\ \ \ /
* \\ \ \ /
* -============'
*
* Copyright (c) 2018 Hevake and contributors, all rights reserved.
*
* This file is part of cpp-tbox (https://github.com/cpp-main/cpp-tbox)
* Use of this source code is governed by MIT license that can be found
* in the LICENSE file in the root of the source tree. All contributing
* project authors may be found in the CONTRIBUTORS.md file in the root
* of the source tree.
*/
#include "terminal.h"
#include <sstream>
#include <tbox/base/log.h>
#include <tbox/util/string.h>
#include "session_context.h"
#include "dir_node.h"
#include "func_node.h"
#include "../connection.h"
namespace tbox {
namespace terminal {
using namespace std;
namespace {
const string MOVE_LEFT_KEY("\033[D");
const string MOVE_RIGHT_KEY("\033[C");
const size_t HISTORY_MAX_SIZE(20);
const char * SPACE_CHARS = " \t";
}
void Terminal::Impl::onChar(SessionContext *s, char ch)
{
if (s->cursor_pos == s->curr_input.size())
s->curr_input.push_back(ch);
else
s->curr_input.insert(s->cursor_pos, 1, ch);
s->cursor_pos++;
if (s->options & kEnableEcho) {
s->wp_conn->send(s->token, ch);
ostringstream oss;
oss << s->curr_input.substr(s->cursor_pos)
<< string((s->curr_input.size() - s->cursor_pos), '\b');
auto refresh_str = oss.str();
if (!refresh_str.empty())
s->wp_conn->send(s->token, refresh_str);
}
}
void Terminal::Impl::onEnterKey(SessionContext *s)
{
if (s->options & kEnableEcho)
s->wp_conn->send(s->token, "\r\n");
if (execute(s)) {
s->history.push_back(s->curr_input);
if (s->history.size() > HISTORY_MAX_SIZE)
s->history.pop_front();
}
printPrompt(s);
s->curr_input.clear();
s->cursor_pos = 0;
s->history_index = 0;
}
void Terminal::Impl::onBackspaceKey(SessionContext *s)
{
if (s->cursor_pos == 0)
return;
if (s->cursor_pos == s->curr_input.size())
s->curr_input.pop_back();
else
s->curr_input.erase((s->cursor_pos - 1), 1);
s->cursor_pos--;
if (s->options & kEnableEcho) {
ostringstream oss;
oss << '\b' << s->curr_input.substr(s->cursor_pos) << ' '
<< string((s->curr_input.size() - s->cursor_pos + 1), '\b');
s->wp_conn->send(s->token, oss.str());
}
}
void Terminal::Impl::onDeleteKey(SessionContext *s)
{
if (s->cursor_pos >= s->curr_input.size())
return;
s->curr_input.erase((s->cursor_pos), 1);
if (s->options & kEnableEcho) {
ostringstream oss;
oss << s->curr_input.substr(s->cursor_pos) << ' '
<< string((s->curr_input.size() - s->cursor_pos + 1), '\b');
s->wp_conn->send(s->token, oss.str());
}
}
/**
* 仅实现对Node的补全，不实现参数的补全
*/
void Terminal::Impl::onTabKey(SessionContext *s)
{
//! 不带回显的终端不能支持补全功能
if ((s->options & kEnableEcho) == 0)
return;
//! 如果当前用户没有任何输入，则不进行补全
if (s->curr_input.empty() || s->cursor_pos == 0)
return;
//! 找出当前光标下正在输入的命令的起始位置
size_t start_pos = 0;
{
/**
* 针对单行多指令的情况："set_a 12; get_ "
* ^
* 要补全的是get_，而不是set_a
*/
//! 尝试从光标所在处往前寻找分号。如果是找到，则将start_pos修正为分号后一位
auto semicolon_pos = s->curr_input.find_last_of(';', s->cursor_pos - 1);
if (semicolon_pos != std::string::npos)
start_pos = semicolon_pos + 1;
//! 略过左边空格，找到有效字符起始位置
start_pos = s->curr_input.find_first_not_of(SPACE_CHARS, start_pos);
/**
* 如果没有找到或找到的位置在光标之后，说明无效，则退出
* 如：" set_a 12"
* ^
*/
if (start_pos == std::string::npos || start_pos >= s->cursor_pos)
return;
}
const auto cmd_str = s->curr_input.substr(start_pos, s->cursor_pos - start_pos);
if (cmd_str.empty())
return;
/**
* 检查从start_pos到s->cursor_pos之间有没有空格
* 如果有则说明当前用户输入的是参数，不是命令，不进行补全
* 如："set_value 12"
* ^
*/
{
auto space_pos = cmd_str.find_first_of(SPACE_CHARS);
if (space_pos != std::string::npos)
return;
}
//! 分离路径和节点名
size_t last_slash_pos = cmd_str.rfind('/');
string dir_path;
string prefix;
if (last_slash_pos != string::npos) {
dir_path = cmd_str.substr(0, last_slash_pos);
prefix = cmd_str.substr(last_slash_pos + 1);
} else {
dir_path = ".";
prefix = cmd_str;
}
//! 查找路径对应的节点
NodeToken dir_token = findNode(dir_path, s);
if (dir_token.isNull())
return;
//! 获取所有匹配的子节点对象
Node* base_node = nodes_.at(dir_token);
if (base_node == nullptr)
return;
vector<string> matched_node_name_vec;
if (auto dir_node = dynamic_cast<DirNode*>(base_node)) {
//! 先获取目录下的所有结点
vector<NodeInfo> children_info_vec;
dir_node->children(children_info_vec);
//! 遍历所有子结点，找出匹配得上的，加入到matched_node_name_vec中
for (const auto& child_info : children_info_vec) {
auto node_name = child_info.name;
if (util::string::IsStartWith(node_name, prefix)) {
Node* child_node = nodes_.at(child_info.token);
if (child_node && child_node->type() == NodeType::kDir)
node_name.push_back('/');
matched_node_name_vec.push_back(node_name);
}
}
if (!prefix.empty()) {
//! 检查是否与内建命令匹配，如何有，也加入到matched_node_name_vec中
for (const auto & buildin_cmd : buildin_cmd_map_) {
auto &cmd_name = buildin_cmd.first;
if (util::string::IsStartWith(cmd_name, prefix))
matched_node_name_vec.push_back(cmd_name);
}
}
}
//! 如果没有找到匹配项，直接结束
if (matched_node_name_vec.empty())
return;
//! 如果只有一个匹配，直接补全
if (matched_node_name_vec.size() == 1) {
const auto &match_node_name = matched_node_name_vec.back();
auto completion = match_node_name.substr(prefix.length()); //! 需要补全的字串
//! 如果不需要补全，则结束
if (completion.empty())
return;
s->curr_input.insert(s->cursor_pos, completion);
s->cursor_pos += completion.length();
s->wp_conn->send(s->token, completion);
ostringstream oss;
oss << s->curr_input.substr(s->cursor_pos)
<< string((s->curr_input.size() - s->cursor_pos), '\b');
auto refresh_str = oss.str();
if (!refresh_str.empty())
s->wp_conn->send(s->token, refresh_str);
} else {
{
//! 多个匹配，显示所有可能
ostringstream oss;
oss << "\r\n";
for (const auto& match : matched_node_name_vec)
oss << match << " ";
oss << "\r\n";
s->wp_conn->send(s->token, oss.str());
}
printPrompt(s);
{
//! 找出最大共同字串，补全内容
auto common_prefix = util::string::ExtractCommonPrefix(matched_node_name_vec);
auto completion = common_prefix.substr(prefix.length()); //! 需要补全的字串
s->curr_input.insert(s->cursor_pos, completion);
s->cursor_pos += completion.length();
ostringstream oss;
oss << s->curr_input
<< string((s->curr_input.size() - s->cursor_pos), '\b');
auto refresh_str = oss.str();
if (!refresh_str.empty())
s->wp_conn->send(s->token, refresh_str);
}
}
}
namespace {
void CleanupInput(SessionContext *s)
{
while (s->cursor_pos < s->curr_input.size()) {
s->wp_conn->send(s->token, MOVE_RIGHT_KEY);
s->cursor_pos++;
}
while (s->cursor_pos--)
s->wp_conn->send(s->token, "\b \b");
}
}
void Terminal::Impl::onMoveUpKey(SessionContext *s)
{
if (s->history_index == s->history.size())
return;
CleanupInput(s);
s->history_index++;
s->curr_input = s->history[s->history.size() - s->history_index];
s->cursor_pos = s->curr_input.size();
s->wp_conn->send(s->token, s->curr_input);
}
void Terminal::Impl::onMoveDownKey(SessionContext *s)
{
if (s->history_index == 0)
return;
CleanupInput(s);
s->history_index--;
if (s->history_index > 0) {
s->curr_input = s->history[s->history.size() - s->history_index];
s->cursor_pos = s->curr_input.size();
} else {
s->curr_input.clear();
s->cursor_pos = 0;
}
s->wp_conn->send(s->token, s->curr_input);
}
void Terminal::Impl::onMoveLeftKey(SessionContext *s)
{
if (s->cursor_pos == 0)
return;
s->cursor_pos--;
s->wp_conn->send(s->token, MOVE_LEFT_KEY);
}
void Terminal::Impl::onMoveRightKey(SessionContext *s)
{
if (s->cursor_pos >= s->curr_input.size())
return;
s->cursor_pos++;
s->wp_conn->send(s->token, MOVE_RIGHT_KEY);
}
void Terminal::Impl::onHomeKey(SessionContext *s)
{
while (s->cursor_pos != 0) {
s->wp_conn->send(s->token, MOVE_LEFT_KEY);
s->cursor_pos--;
}
}
void Terminal::Impl::onEndKey(SessionContext *s)
{
while (s->cursor_pos < s->curr_input.size()) {
s->wp_conn->send(s->token, MOVE_RIGHT_KEY);
s->cursor_pos++;
}
}
}
}
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