kakoune/src/command_manager.cc

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