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improve quality of error message

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ToruNiina
2018-12-09 13:05:09 +09:00
parent 2b3a4d49a5
commit 84676eab0b
1 changed files with 17 additions and 6 deletions
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23
toml/region.hpp
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@@ -3,6 +3,7 @@
#include "exception.hpp"
#include <memory>
#include <algorithm>
#include <initializer_list>
#include <iterator>
#include <iostream>
@@ -78,8 +79,8 @@ struct region_base
virtual bool is_ok() const noexcept {return false;}
virtual std::string str() const {return std::string("");}
virtual std::string name() const {return std::string("");}
virtual std::string line() const {return std::string("");}
virtual std::string name() const {return std::string("unknown location");}
virtual std::string line() const {return std::string("unknown line");}
virtual std::string line_num() const {return std::string("?");}
virtual std::size_t before() const noexcept {return 0;}
@@ -187,7 +188,6 @@ struct region final : public region_base
inline std::string format_underline(const std::string& message,
const region_base& reg, const std::string& comment_for_underline)
{
const auto line = reg.line();
const auto line_number = reg.line_num();
@@ -213,7 +213,8 @@ inline std::string format_underline(const std::string& message,
template<typename Container>
std::string
format_underline(const std::string& message, const location<Container>& loc,
const std::string& comment_for_underline)
const std::string& comment_for_underline,
std::initializer_list<std::string> helps = {})
{
using const_iterator = typename location<Container>::const_iterator;
using reverse_iterator = std::reverse_iterator<const_iterator>;
@@ -238,10 +239,20 @@ format_underline(const std::string& message, const location<Container>& loc,
retval += " | ";
retval += make_string(std::distance(line_begin, loc.iter()),' ');
retval += '^';
retval += make_string(std::distance(loc.iter(), line_end), '~');
retval += make_string(std::distance(loc.iter(), line_end), '-');
retval += ' ';
retval += comment_for_underline;
if(helps.size() != 0)
{
retval += '\n';
retval += make_string(line_number.size() + 1, ' ');
retval += " | ";
for(const auto help : helps)
{
retval += "\nHint: ";
retval += help;
}
}
return retval;
}