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