kakoune/src/parameters_parser.cc
2019-05-10 23:46:16 +10:00

86 lines
2.9 KiB
C++

#include "parameters_parser.hh"
#include "flags.hh"
namespace Kakoune
{
String generate_switches_doc(const SwitchMap& switches)
{
String res;
if (switches.empty())
return res;
auto switch_len = [](auto& sw) { return sw.key.column_length() + (sw.value.takes_arg ? 5 : 0); };
auto switches_len = switches | transform(switch_len);
const ColumnCount maxlen = *std::max_element(switches_len.begin(), switches_len.end());
for (auto& sw : switches) {
res += format("-{} {}{}{}\n",
sw.key,
sw.value.takes_arg ? "<arg>" : "",
String{' ', maxlen - switch_len(sw) + 1},
sw.value.description);
}
return res;
}
ParametersParser::ParametersParser(ParameterList params, const ParameterDesc& desc)
: m_params(params)
{
const bool switches_only_at_start = desc.flags & ParameterDesc::Flags::SwitchesOnlyAtStart;
const bool ignore_unknown_switches = desc.flags & ParameterDesc::Flags::IgnoreUnknownSwitches;
bool only_pos = desc.flags & ParameterDesc::Flags::SwitchesAsPositional;
Vector<bool> switch_seen(desc.switches.size(), false);
for (size_t i = 0; i < params.size(); ++i)
{
if (not only_pos and not ignore_unknown_switches and params[i] == "--")
only_pos = true;
else if (not only_pos and not params[i].empty() and params[i][0_byte] == '-')
{
StringView switch_name = params[i].substr(1_byte);
auto it = desc.switches.find(switch_name);
if (it == desc.switches.end())
{
if (ignore_unknown_switches)
{
m_positional_indices.push_back(i);
if (switches_only_at_start)
only_pos = true;
continue;
}
throw unknown_option(params[i]);
}
auto switch_index = it - desc.switches.begin();
if (switch_seen[switch_index])
throw runtime_error{format("switch '-{}' specified more than once", it->key)};
switch_seen[switch_index] = true;
if (it->value.takes_arg and ++i == params.size())
throw missing_option_value(it->key);
m_switches[switch_name.str()] = it->value.takes_arg ? params[i] : StringView{};
}
else // positional
{
if (switches_only_at_start)
only_pos = true;
m_positional_indices.push_back(i);
}
}
size_t count = m_positional_indices.size();
if (count > desc.max_positionals or count < desc.min_positionals)
throw wrong_argument_count();
}
Optional<StringView> ParametersParser::get_switch(StringView name) const
{
auto it = m_switches.find(name);
return it == m_switches.end() ? Optional<StringView>{}
: Optional<StringView>{it->value};
}
}