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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-error.hh"
#include "mu-utils.hh"
#include <iostream>
#include <algorithm>
using namespace Mu;
using namespace Command;
void
Command::invoke(const Command::CommandMap& cmap, const Sexp& call)
{
if (!call.is_call()) {
throw Mu::Error{Error::Code::Command,
"expected call-sexpr but got %s",
call.to_sexp_string().c_str()};
}
const auto& params{call.list()};
const auto cmd_it = cmap.find(params.at(0).value());
if (cmd_it == cmap.end())
throw Mu::Error{Error::Code::Command,
"unknown command in call %s",
call.to_sexp_string().c_str()};
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 = [&]()->Sexp::Seq::const_iterator {
for (size_t i = 1; i < params.size(); i += 2)
if (params.at(i).is_symbol() && params.at(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 Mu::Error{Error::Code::Command,
"missing required parameter %s in call %s",
argname.c_str(), call.to_sexp_string().c_str()};
continue; // not required
}
// the types must match, but the 'nil' symbol is acceptable as
// "no value"
if (param_it->type() != arginfo.type && !(param_it->is_nil()))
throw Mu::Error{Error::Code::Command,
"parameter %s expects type %s, but got %s in call %s",
argname.c_str(), to_string(arginfo.type).c_str(),
to_string(param_it->type()).c_str(),
call.to_sexp_string().c_str()};
}
// 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.at(i).value() == arg.first;}))
throw Mu::Error{Error::Code::Command,
"unknown parameter %s in call %s",
params.at(i).value().c_str(), call.to_sexp_string().c_str()};
}
if (cinfo.handler)
cinfo.handler(params);
}
static Sexp::Seq::const_iterator
find_param_node (const Parameters& params, const std::string& argname)
{
if (params.empty())
throw Error(Error::Code::InvalidArgument,
"params must not be empty");
if (argname.empty() || argname.at(0) != ':')
throw Error(Error::Code::InvalidArgument,
"property key must start with ':' but got '%s')",
argname.c_str());
for (size_t i = 1; i < params.size(); i += 2) {
if (i + 1 != params.size() &&
params.at(i).is_symbol() && params.at(i).value() == argname)
return params.begin() + i + 1;
}
return params.end();
}
static Error
wrong_type (Sexp::Type expected, Sexp::Type got)
{
return Error(Error::Code::InvalidArgument,
"expected <%s> but got <%s>",
to_string(expected).c_str(),
to_string(got).c_str());
}
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() || it->is_nil())
return alt;
else if (!it->is_string())
throw wrong_type(Sexp::Type::String, it->type());
else
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() || it->is_nil())
return alt;
else if (!it->is_symbol())
throw wrong_type(Sexp::Type::Symbol, it->type());
else
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() || it->is_nil())
return alt;
else if (!it->is_number())
throw wrong_type(Sexp::Type::Number, it->type());
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->is_symbol())
throw wrong_type(Sexp::Type::Symbol, it->type());
else
return it->is_nil() ? false : true;
}
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() || it->is_nil())
return {};
else if (!it->is_list())
throw wrong_type(Sexp::Type::List, it->type());
std::vector<std::string> vec;
for (const auto& n: it->list()) {
if (!n.is_string())
throw wrong_type(Sexp::Type::String, n.type());
vec.emplace_back (n.value());
}
return vec;
}
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