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Replace some tag dispatch with if constexpr

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This commit is contained in:
Maxime Coste 2020-06-01 20:46:48 +10:00
parent 321facb594
commit 0fba373d1d
1 changed files with 21 additions and 36 deletions
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57
src/command_manager.cc
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@ -300,41 +300,10 @@ Token parse_percent_token(Reader& reader, bool throw_on_unterminated)
}
}
auto expand_option(const Option& opt, std::true_type)
{
return opt.get_as_string(Quoting::Raw);
}
auto expand_option(const Option& opt, std::false_type)
{
return opt.get_as_strings();
}
auto expand_register(StringView reg, const Context& context, std::true_type)
{
return context.main_sel_register_value(reg).str();
}
auto expand_register(StringView reg, const Context& context, std::false_type)
{
return RegisterManager::instance()[reg].get(context) | gather<Vector<String>>();
}
String expand_arobase(ConstArrayView<String> params, std::true_type)
{
return join(params, ' ', false);
}
Vector<String> expand_arobase(ConstArrayView<String> params, std::false_type)
{
return {params.begin(), params.end()};
}
template<bool single>
std::conditional_t<single, String, Vector<String>>
expand_token(const Token& token, const Context& context, const ShellContext& shell_context)
{
using IsSingle = std::integral_constant<bool, single>;
auto& content = token.content;
switch (token.type)
{
@ -355,24 +324,40 @@ expand_token(const Token& token, const Context& context, const ShellContext& she
return {str};
}
case Token::Type::RegisterExpand:
return expand_register(content, context, IsSingle{});
if constexpr (single)
return context.main_sel_register_value(content).str();
else
return RegisterManager::instance()[content].get(context) | gather<Vector<String>>();
case Token::Type::OptionExpand:
return expand_option(context.options()[content], IsSingle{});
{
auto& opt = context.options()[content];
if constexpr (single)
return opt.get_as_string(Quoting::Raw);
else
return opt.get_as_strings();
}
case Token::Type::ValExpand:
{
auto it = shell_context.env_vars.find(content);
if (it != shell_context.env_vars.end())
return {it->value};
auto val = ShellManager::instance().get_val(content, context);
if constexpr (single)
return join(ShellManager::instance().get_val(content, context), false, ' ');
return join(val, false, ' ');
else
return ShellManager::instance().get_val(content, context);
return val;
}
case Token::Type::ArgExpand:
{
auto& params = shell_context.params;
if (content == '@')
return expand_arobase(params, IsSingle{});
{
if constexpr (single)
return join(params, ' ', false);
else
return Vector<String>{params.begin(), params.end()};
}
const int arg = str_to_int(content)-1;
if (arg < 0)