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https://github.com/ToruNiina/toml11.git
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6f950c9ec8
`location::line_num()` function used to be implemented by using `std::count`, so each time the parser encounters a type mismatch, `std::count` was called with almost whole file. It decelerates the parsing process too much, so I decided to add `line_number_` member variable to `location` and add `advance/retrace/reset` to `location` in order to modify the position that is pointed.
371 lines
12 KiB
C++
371 lines
12 KiB
C++
// Copyright Toru Niina 2017.
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// Distributed under the MIT License.
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#ifndef TOML11_REGION_HPP
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#define TOML11_REGION_HPP
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#include "exception.hpp"
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#include <memory>
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#include <vector>
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#include <algorithm>
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#include <initializer_list>
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#include <iterator>
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#include <iomanip>
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namespace toml
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{
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namespace detail
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{
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// helper function to avoid std::string(0, 'c') or std::string(iter, iter)
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template<typename Iterator>
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std::string make_string(Iterator first, Iterator last)
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{
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if(first == last) {return "";}
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return std::string(first, last);
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}
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inline std::string make_string(std::size_t len, char c)
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{
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if(len == 0) {return "";}
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return std::string(len, c);
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}
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// region_base is a base class of location and region that are defined below.
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// it will be used to generate better error messages.
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struct region_base
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{
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region_base() = default;
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virtual ~region_base() = default;
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region_base(const region_base&) = default;
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region_base(region_base&& ) = default;
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region_base& operator=(const region_base&) = default;
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region_base& operator=(region_base&& ) = default;
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virtual bool is_ok() const noexcept {return false;}
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virtual std::string str() const {return std::string("unknown region");}
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virtual std::string name() const {return std::string("unknown file");}
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virtual std::string line() const {return std::string("unknown line");}
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virtual std::string line_num() const {return std::string("?");}
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// length of the region
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virtual std::size_t size() const noexcept {return 0;}
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// number of characters in the line before the region
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virtual std::size_t before() const noexcept {return 0;}
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// number of characters in the line after the region
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virtual std::size_t after() const noexcept {return 0;}
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};
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// location represents a position in a container, which contains a file content.
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// it can be considered as a region that contains only one character.
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//
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// it contains pointer to the file content and iterator that points the current
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// location.
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template<typename Container>
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struct location final : public region_base
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{
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using const_iterator = typename Container::const_iterator;
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using source_ptr = std::shared_ptr<const Container>;
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static_assert(std::is_same<char, typename Container::value_type>::value,"");
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static_assert(std::is_same<std::random_access_iterator_tag,
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typename std::iterator_traits<const_iterator>::iterator_category>::value,
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"container should be randomly accessible");
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location(std::string name, Container cont)
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: source_(std::make_shared<Container>(std::move(cont))), line_number_(0),
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source_name_(std::move(name)), iter_(source_->cbegin())
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{}
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location(const location&) = default;
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location(location&&) = default;
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location& operator=(const location&) = default;
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location& operator=(location&&) = default;
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~location() = default;
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bool is_ok() const noexcept override {return static_cast<bool>(source_);}
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// this const prohibits codes like `++(loc.iter())`.
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const const_iterator iter() const noexcept {return iter_;}
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const_iterator begin() const noexcept {return source_->cbegin();}
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const_iterator end() const noexcept {return source_->cend();}
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// XXX At first, `location::line_num()` is implemented using `std::count` to
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// count a number of '\n'. But with a long toml file (typically, 10k lines),
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// it becomes intolerably slow because each time it generates error messages,
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// it counts '\n' from thousands of characters. To workaround it, I decided
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// to introduce `location::line_number_` member variable and synchronize it
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// to the location changes the point to look. So an overload of `iter()`
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// which returns mutable reference is removed and `advance()`, `retrace()`
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// and `reset()` is added.
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void advance(std::size_t n = 1) noexcept
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{
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this->line_number_ += std::count(this->iter_, this->iter_ + n, '\n');
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this->iter_ += n;
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return;
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}
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void retrace(std::size_t n = 1) noexcept
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{
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this->line_number_ -= std::count(this->iter_ - n, this->iter_, '\n');
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this->iter_ -= n;
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return;
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}
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void reset(const_iterator rollback) noexcept
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{
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// since c++11, std::distance works in both ways and returns a negative
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// value if `first` is ahead from `last`.
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if(0 <= std::distance(rollback, this->iter_)) // rollback < iter
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{
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this->line_number_ -= std::count(rollback, this->iter_, '\n');
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}
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else // iter < rollback [[unlikely]]
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{
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this->line_number_ += std::count(this->iter_, rollback, '\n');
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}
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this->iter_ = rollback;
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return;
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}
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std::string str() const override {return make_string(1, *this->iter());}
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std::string name() const override {return source_name_;}
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std::string line_num() const override
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{
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return std::to_string(this->line_number_);
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}
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std::string line() const override
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{
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return make_string(this->line_begin(), this->line_end());
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}
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const_iterator line_begin() const noexcept
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{
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using reverse_iterator = std::reverse_iterator<const_iterator>;
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return std::find(reverse_iterator(this->iter()),
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reverse_iterator(this->begin()), '\n').base();
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}
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const_iterator line_end() const noexcept
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{
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return std::find(this->iter(), this->end(), '\n');
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}
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// location is always points a character. so the size is 1.
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std::size_t size() const noexcept override
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{
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return 1u;
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}
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std::size_t before() const noexcept override
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{
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return std::distance(this->line_begin(), this->iter());
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}
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std::size_t after() const noexcept override
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{
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return std::distance(this->iter(), this->line_end());
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}
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source_ptr const& source() const& noexcept {return source_;}
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source_ptr&& source() && noexcept {return std::move(source_);}
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private:
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source_ptr source_;
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std::size_t line_number_;
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std::string source_name_;
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const_iterator iter_;
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};
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// region represents a range in a container, which contains a file content.
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//
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// it contains pointer to the file content and iterator that points the first
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// and last location.
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template<typename Container>
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struct region final : public region_base
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{
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using const_iterator = typename Container::const_iterator;
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using source_ptr = std::shared_ptr<const Container>;
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static_assert(std::is_same<char, typename Container::value_type>::value,"");
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static_assert(std::is_same<std::random_access_iterator_tag,
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typename std::iterator_traits<const_iterator>::iterator_category>::value,
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"container should be randomly accessible");
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// delete default constructor. source_ never be null.
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region() = delete;
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region(const location<Container>& loc)
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: source_(loc.source()), source_name_(loc.name()),
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first_(loc.iter()), last_(loc.iter())
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{}
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region(location<Container>&& loc)
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: source_(loc.source()), source_name_(loc.name()),
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first_(loc.iter()), last_(loc.iter())
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{}
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region(const location<Container>& loc, const_iterator f, const_iterator l)
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: source_(loc.source()), source_name_(loc.name()), first_(f), last_(l)
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{}
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region(location<Container>&& loc, const_iterator f, const_iterator l)
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: source_(loc.source()), source_name_(loc.name()), first_(f), last_(l)
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{}
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region(const region&) = default;
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region(region&&) = default;
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region& operator=(const region&) = default;
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region& operator=(region&&) = default;
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~region() = default;
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region& operator+=(const region& other)
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{
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if(this->begin() != other.begin() || this->end() != other.end() ||
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this->last_ != other.first_)
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{
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throw internal_error("invalid region concatenation");
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}
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this->last_ = other.last_;
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return *this;
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}
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bool is_ok() const noexcept override {return static_cast<bool>(source_);}
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std::string str() const override {return make_string(first_, last_);}
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std::string line() const override
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{
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if(this->contain_newline())
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{
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return make_string(this->line_begin(),
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std::find(this->line_begin(), this->last(), '\n'));
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}
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return make_string(this->line_begin(), this->line_end());
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}
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std::string line_num() const override
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{
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return std::to_string(1 + std::count(this->begin(), this->first(), '\n'));
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}
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std::size_t size() const noexcept override
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{
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return std::distance(first_, last_);
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}
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std::size_t before() const noexcept override
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{
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return std::distance(this->line_begin(), this->first());
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}
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std::size_t after() const noexcept override
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{
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return std::distance(this->last(), this->line_end());
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}
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bool contain_newline() const noexcept
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{
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return std::find(this->first(), this->last(), '\n') != this->last();
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}
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const_iterator line_begin() const noexcept
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{
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using reverse_iterator = std::reverse_iterator<const_iterator>;
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return std::find(reverse_iterator(this->first()),
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reverse_iterator(this->begin()), '\n').base();
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}
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const_iterator line_end() const noexcept
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{
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return std::find(this->last(), this->end(), '\n');
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}
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const_iterator begin() const noexcept {return source_->cbegin();}
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const_iterator end() const noexcept {return source_->cend();}
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const_iterator first() const noexcept {return first_;}
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const_iterator last() const noexcept {return last_;}
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source_ptr const& source() const& noexcept {return source_;}
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source_ptr&& source() && noexcept {return std::move(source_);}
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std::string name() const override {return source_name_;}
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private:
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source_ptr source_;
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std::string source_name_;
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const_iterator first_, last_;
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};
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// to show a better error message.
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inline std::string format_underline(const std::string& message,
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std::vector<std::pair<region_base const*, std::string>> reg_com,
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std::vector<std::string> helps = {})
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{
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assert(!reg_com.empty());
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#ifdef _WIN32
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const auto newline = "\r\n";
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#else
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const char newline = '\n';
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#endif
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const auto line_num_width = std::max_element(reg_com.begin(), reg_com.end(),
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[](std::pair<region_base const*, std::string> const& lhs,
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std::pair<region_base const*, std::string> const& rhs)
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{
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return lhs.first->line_num().size() < rhs.first->line_num().size();
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}
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)->first->line_num().size();
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std::ostringstream retval;
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retval << message << newline;
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for(std::size_t i=0; i<reg_com.size(); ++i)
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{
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if(i!=0 && reg_com.at(i-1).first->name() == reg_com.at(i).first->name())
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{
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retval << newline << " ..." << newline;
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}
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else
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{
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if(i != 0) {retval << newline;}
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retval << " --> " << reg_com.at(i).first->name() << newline;
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}
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const region_base* const reg = reg_com.at(i).first;
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const std::string& comment = reg_com.at(i).second;
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retval << ' ' << std::setw(line_num_width) << reg->line_num();
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retval << " | " << reg->line() << newline;
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retval << make_string(line_num_width + 1, ' ');
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retval << " | " << make_string(reg->before(), ' ');
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if(reg->size() == 1)
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{
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// invalid
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// ^------
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retval << '^';
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retval << make_string(reg->after(), '-');
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}
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else
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{
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// invalid
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// ~~~~~~~
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retval << make_string(reg->size(), '~');
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}
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retval << ' ';
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retval << comment;
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}
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if(helps.size() != 0)
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{
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retval << newline;
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retval << make_string(line_num_width + 1, ' ');
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retval << " | ";
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for(const auto help : helps)
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{
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retval << newline;
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retval << "Hint: ";
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retval << help;
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}
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}
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return retval.str();
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}
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} // detail
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} // toml
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#endif// TOML11_REGION_H
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