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/*
** Copyright (C) 2020 Dirk-Jan C. Binnema <djcb@djcbsoftware.nl>
**
** This program 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; either version 3, or (at your option) any
** later version.
**
** This program 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 this program; if not, write to the Free Software Foundation,
** Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
**
*/
#include "mu-command-parser.hh"
#include "mu-utils.hh"
#include <iostream>
#include <algorithm>
using namespace Mu;
using namespace Command;
using namespace Sexp;
static Mu::Error
command_error(const std::string& msg)
{
return Mu::Error(Error::Code::Command, msg);
}
void
Command::invoke(const Command::CommandMap& cmap, const Node& call)
{
if (call.type != Type::List || call.children.empty() ||
call.children[0].type != Type::Symbol)
throw command_error("call must be a list starting with a symbol");
const auto& params{call.children};
const auto cmd_it = cmap.find(params[0].value);
if (cmd_it == cmap.end())
throw command_error("unknown command '" + params[0].value + "'");
const auto& cinfo{cmd_it->second};
// all required parameters must be present
for (auto&& arg: cinfo.args) {
const auto& argname{arg.first};
const auto& arginfo{arg.second};
// calls used keyword-parameters, e.g.
// (my-function :bar 1 :cuux "fnorb")
// so, we're looking for the odd-numbered parameters.
const auto param_it = [&]() {
for (size_t i = 1; i < params.size(); i += 2)
if (params[i].type == Type::Symbol &&
params[i].value == ':' + argname)
return params.begin() + i + 1;
return params.end();
}();
// it's an error when a required parameter is missing.
if (param_it == params.end()) {
if (arginfo.required)
throw command_error("missing required parameter '" + argname + "'");
continue; // not required
}
// the types must match, but the 'nil' symbol is acceptable as
// "no value"
if (param_it->type != arginfo.type &&
!(param_it->type == Type::Symbol && param_it->value == "nil"))
throw command_error("parameter '" + argname + "' expects type " +
to_string(arginfo.type) +
" but got " + to_string(param_it->type));
}
// all passed parameters must be known
for (size_t i = 1; i < params.size(); i += 2) {
if (std::none_of(cinfo.args.begin(), cinfo.args.end(),
[&](auto&& arg) {return params[i].value == ":" + arg.first;}))
throw command_error("unknown parameter '" + params[i].value + "'");
}
if (cinfo.handler)
cinfo.handler(params);
}
static Parameters::const_iterator
find_param_node (const Parameters& params, const std::string& argname)
{
for (size_t i = 1; i < params.size(); i += 2) {
if (i + 1 != params.size() &&
params[i].type == Type::Symbol &&
params[i].value == ':' + argname)
return params.begin() + i + 1;
}
return params.end();
}
constexpr auto Nil = "nil";
static bool
is_nil(const Node& node)
{
return node.type == Type::Symbol && node.value == Nil;
}
const std::string&
Command::get_string_or (const Parameters& params, const std::string& argname,
const std::string& alt)
{
const auto it = find_param_node (params, argname);
if (it == params.end() || is_nil(*it))
return alt;
else if (it->type != Type::String)
throw Error(Error::Code::InvalidArgument, "expected <string> but got %s (value: '%s')",
to_string(it->type).c_str(),
it->value.c_str());
return it->value;
}
const std::string&
Command::get_symbol_or (const Parameters& params, const std::string& argname,
const std::string& alt)
{
const auto it = find_param_node (params, argname);
if (it == params.end() || is_nil(*it))
return alt;
else if (it->type != Type::Symbol)
throw Error(Error::Code::InvalidArgument, "expected <symbol> but got %s (value: '%s')",
to_string(it->type).c_str(),
it->value.c_str());
return it->value;
}
int
Command::get_int_or (const Parameters& params, const std::string& argname,
int alt)
{
const auto it = find_param_node (params, argname);
if (it == params.end() || is_nil(*it))
return alt;
else if (it->type != Type::Integer)
throw Error(Error::Code::InvalidArgument, "expected <integer> but got %s",
to_string(it->type).c_str());
else
return ::atoi(it->value.c_str());
}
bool
Command::get_bool_or (const Parameters& params, const std::string& argname,
bool alt)
{
const auto it = find_param_node (params, argname);
if (it == params.end())
return alt;
else if (it->type != Type::Symbol)
throw Error(Error::Code::InvalidArgument, "expected <symbol> but got %s",
to_string(it->type).c_str());
else
return it->value != Nil;
}
std::vector<std::string>
Command::get_string_vec (const Parameters& params, const std::string& argname)
{
const auto it = find_param_node (params, argname);
if (it == params.end() || is_nil(*it))
return {};
else if (it->type != Type::List)
throw Error(Error::Code::InvalidArgument, "expected <list> but got %s",
to_string(it->type).c_str());
std::vector<std::string> vec;
for (const auto& n: it->children) {
if (n.type != Type::String)
throw Error(Error::Code::InvalidArgument,
"expected string element but got %s",
to_string(n.type).c_str());
vec.emplace_back (n.value);
}
return vec;
}
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