410 lines
13 KiB
C++
410 lines
13 KiB
C++
#include "command_manager.hh"
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#include "assert.hh"
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#include "context.hh"
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#include "register_manager.hh"
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#include "shell_manager.hh"
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#include "utils.hh"
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#include <algorithm>
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namespace Kakoune
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{
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bool CommandManager::command_defined(const String& command_name) const
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{
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return find_command(command_name) != m_commands.end();
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}
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void CommandManager::register_command(String command_name,
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Command command,
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CommandFlags flags,
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CommandCompleter completer)
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{
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m_commands[command_name] = { std::move(command), flags, std::move(completer) };
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}
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void CommandManager::register_commands(memoryview<String> command_names,
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Command command,
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CommandFlags flags,
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CommandCompleter completer)
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{
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kak_assert(not command_names.empty());
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m_commands[command_names[0]] = { std::move(command), flags, completer };
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for (size_t i = 1; i < command_names.size(); ++i)
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m_aliases[command_names[i]] = command_names[0];
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}
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struct parse_error : runtime_error
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{
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parse_error(const String& error)
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: runtime_error{"parse error: " + error} {}
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};
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namespace
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{
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struct Token
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{
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enum class Type
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{
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Raw,
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ShellExpand,
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RegisterExpand,
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OptionExpand,
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CommandSeparator
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};
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Token() : m_type(Type::Raw) {}
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Token(Type type, ByteCount b, ByteCount e, String str = "")
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: m_type(type), m_begin(b), m_end(e), m_content(str) {}
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Type type() const { return m_type; }
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ByteCount begin() const { return m_begin; }
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ByteCount end() const { return m_end; }
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const String& content() const { return m_content; }
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private:
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Type m_type;
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ByteCount m_begin;
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ByteCount m_end;
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String m_content;
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};
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using TokenList = std::vector<Token>;
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using TokenPosList = std::vector<std::pair<ByteCount, ByteCount>>;
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bool is_command_separator(char c)
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{
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return c == ';' or c == '\n';
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}
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struct unterminated_string : parse_error
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{
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unterminated_string(const String& open, const String& close, int nest = 0)
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: parse_error{"unterminated string '" + open + "..." + close + "'" +
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(nest > 0 ? "(nesting: " + to_string(nest) + ")" : "")}
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{}
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};
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struct unknown_expand : parse_error
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{
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unknown_expand(const String& name)
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: parse_error{"unknown expand '" + name + "'"} {}
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};
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String get_until_delimiter(const String& base, ByteCount& pos, char delimiter)
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{
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const ByteCount length = base.length();
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String str;
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while (true)
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{
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char c = base[pos];
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if (c == delimiter)
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{
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if (base[pos-1] != '\\')
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return str;
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str.back() = delimiter;
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}
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else
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str += c;
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if (++pos == length)
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throw unterminated_string(String{delimiter}, String{delimiter});
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}
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}
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String get_until_delimiter(const String& base, ByteCount& pos,
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char opening_delimiter, char closing_delimiter)
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{
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kak_assert(base[pos-1] == opening_delimiter);
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const ByteCount length = base.length();
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int level = 0;
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ByteCount start = pos;
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while (pos != length)
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{
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if (base[pos] == opening_delimiter)
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++level;
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else if (base[pos] == closing_delimiter)
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{
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if (level > 0)
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--level;
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else
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break;
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}
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++pos;
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}
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return base.substr(start, pos - start);
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}
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Token::Type token_type(const String& type_name)
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{
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if (type_name == "")
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return Token::Type::Raw;
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else if (type_name == "sh")
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return Token::Type::ShellExpand;
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else if (type_name == "reg")
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return Token::Type::RegisterExpand;
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else if (type_name == "opt")
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return Token::Type::OptionExpand;
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else
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throw unknown_expand{type_name};
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}
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void skip_blanks_and_comments(const String& base, ByteCount& pos)
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{
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const ByteCount length = base.length();
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while (pos != length)
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{
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if (is_horizontal_blank(base[pos]))
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++pos;
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else if (base[pos] == '\\' and pos+1 < length and base[pos+1] == '\n')
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pos += 2;
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else if (base[pos] == '#')
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{
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while (pos != length and base[pos] != '\n')
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++pos;
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}
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else
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break;
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}
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}
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TokenList parse(const String& line)
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{
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TokenList result;
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ByteCount length = line.length();
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ByteCount pos = 0;
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while (pos < length)
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{
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skip_blanks_and_comments(line, pos);
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ByteCount token_start = pos;
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ByteCount start_pos = pos;
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if (line[pos] == '"' or line[pos] == '\'')
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{
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char delimiter = line[pos];
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token_start = ++pos;
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String token = get_until_delimiter(line, pos, delimiter);
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result.emplace_back(Token::Type::Raw, token_start, pos, std::move(token));
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}
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else if (line[pos] == '%')
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{
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ByteCount type_start = ++pos;
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while (isalpha(line[pos]))
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++pos;
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String type_name = line.substr(type_start, pos - type_start);
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if (pos == length)
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throw parse_error{"expected a string delimiter after '%" + type_name + "'"};
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Token::Type type = token_type(type_name);
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static const std::unordered_map<char, char> matching_delimiters = {
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{ '(', ')' }, { '[', ']' }, { '{', '}' }, { '<', '>' }
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};
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char opening_delimiter = line[pos];
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token_start = ++pos;
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auto delim_it = matching_delimiters.find(opening_delimiter);
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if (delim_it != matching_delimiters.end())
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{
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char closing_delimiter = delim_it->second;
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String token = get_until_delimiter(line, pos, opening_delimiter, closing_delimiter);
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if (pos == length)
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throw unterminated_string("%" + type_name + opening_delimiter,
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String{closing_delimiter}, 0);
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result.emplace_back(type, token_start, pos, std::move(token));
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}
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else
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{
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String token = get_until_delimiter(line, pos, opening_delimiter);
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result.emplace_back(type, token_start, pos, std::move(token));
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}
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}
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else
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{
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while (pos != length and
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((not is_command_separator(line[pos]) and
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not is_horizontal_blank(line[pos]))
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or (pos != 0 and line[pos-1] == '\\')))
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++pos;
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if (start_pos != pos)
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{
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auto token = line.substr(token_start, pos - token_start);
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static const Regex regex{R"(\\([ \t;\n]))"};
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result.emplace_back(Token::Type::Raw, token_start, pos,
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boost::regex_replace(token, regex, "\\1"));
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}
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}
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if (is_command_separator(line[pos]))
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result.push_back(Token{ Token::Type::CommandSeparator, pos, pos+1 });
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++pos;
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}
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if (not result.empty() and result.back().type() == Token::Type::CommandSeparator)
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result.pop_back();
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return result;
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}
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}
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struct command_not_found : runtime_error
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{
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command_not_found(const String& command)
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: runtime_error(command + " : no such command") {}
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};
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CommandManager::CommandMap::const_iterator CommandManager::find_command(const String& name) const
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{
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auto it = m_aliases.find(name);
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const String& cmd_name = it == m_aliases.end() ? name : it->second;
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return m_commands.find(cmd_name);
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}
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void CommandManager::execute_single_command(CommandParameters params,
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Context& context) const
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{
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if (params.empty())
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return;
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memoryview<String> param_view(params.begin()+1, params.end());
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auto command_it = find_command(params[0]);
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if (command_it == m_commands.end())
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throw command_not_found(params[0]);
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command_it->second.command(param_view, context);
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}
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void CommandManager::execute(const String& command_line,
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Context& context,
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memoryview<String> shell_params,
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const EnvVarMap& env_vars)
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{
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TokenList tokens = parse(command_line);
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if (tokens.empty())
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return;
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std::vector<String> params;
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for (auto it = tokens.begin(); it != tokens.end(); ++it)
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{
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if (it->type() == Token::Type::ShellExpand)
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{
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String output = ShellManager::instance().eval(it->content(),
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context, shell_params,
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env_vars);
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TokenList shell_tokens = parse(output);
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it = tokens.erase(it);
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for (auto& token : shell_tokens)
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it = ++tokens.insert(it, std::move(token));
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it -= shell_tokens.size();
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// when last token is a ShellExpand which produces no output
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if (it == tokens.end())
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break;
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}
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if (it->type() == Token::Type::RegisterExpand)
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{
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if (it->content().length() != 1)
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throw runtime_error("wrong register name: " + it->content());
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Register& reg = RegisterManager::instance()[it->content()[0]];
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params.push_back(reg.values(context)[0]);
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}
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if (it->type() == Token::Type::OptionExpand)
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{
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const Option& option = context.options()[it->content()];
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params.push_back(option.get_as_string());
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}
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if (it->type() == Token::Type::CommandSeparator)
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{
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execute_single_command(params, context);
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params.clear();
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}
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if (it->type() == Token::Type::Raw)
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params.push_back(it->content());
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}
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execute_single_command(params, context);
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}
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Completions CommandManager::complete(const Context& context, CompletionFlags flags,
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const String& command_line, ByteCount cursor_pos)
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{
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TokenList tokens = parse(command_line);
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size_t token_to_complete = tokens.size();
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for (size_t i = 0; i < tokens.size(); ++i)
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{
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if (tokens[i].begin() <= cursor_pos and tokens[i].end() >= cursor_pos)
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{
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token_to_complete = i;
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break;
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}
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}
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if (token_to_complete == 0 or tokens.empty()) // command name completion
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{
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ByteCount cmd_start = tokens.empty() ? 0 : tokens[0].begin();
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Completions result(cmd_start, cursor_pos);
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String prefix = command_line.substr(cmd_start,
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cursor_pos - cmd_start);
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for (auto& command : m_commands)
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{
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if (command.second.flags & CommandFlags::Hidden)
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continue;
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if ( prefix_match(command.first, prefix))
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result.candidates.push_back(command.first);
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}
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std::sort(result.candidates.begin(), result.candidates.end());
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return result;
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}
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kak_assert(not tokens.empty());
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if (tokens[0].type() != Token::Type::Raw)
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return Completions();
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const String& command_name = tokens[0].content();
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auto command_it = find_command(command_name);
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if (command_it == m_commands.end() or not command_it->second.completer)
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return Completions();
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ByteCount start = token_to_complete < tokens.size() ?
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tokens[token_to_complete].begin() : cursor_pos;
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Completions result(start , cursor_pos);
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ByteCount cursor_pos_in_token = cursor_pos - start;
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std::vector<String> params;
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for (auto token_it = tokens.begin()+1; token_it != tokens.end(); ++token_it)
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params.push_back(token_it->content());
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result.candidates = command_it->second.completer(context, flags, params,
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token_to_complete - 1,
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cursor_pos_in_token);
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return result;
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}
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CandidateList PerArgumentCommandCompleter::operator()(const Context& context,
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CompletionFlags flags,
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CommandParameters params,
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size_t token_to_complete,
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ByteCount pos_in_token) const
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{
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if (token_to_complete >= m_completers.size())
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return CandidateList();
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// it is possible to try to complete a new argument
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kak_assert(token_to_complete <= params.size());
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const String& argument = token_to_complete < params.size() ?
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params[token_to_complete] : String();
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return m_completers[token_to_complete](context, flags, argument, pos_in_token);
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}
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}
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