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#pragma once
/**
* @file
*
* @brief Pos and AbstractPos
*/
#include <cstdint>
#include <string>
#include "source-path.hh"
namespace nix {
/**
* A position and an origin for that position (like a source file).
*/
struct Pos
{
uint32_t line = 0;
uint32_t column = 0;
struct Stdin {
ref<std::string> source;
bool operator==(const Stdin & rhs) const
{ return *source == *rhs.source; }
bool operator!=(const Stdin & rhs) const
{ return *source != *rhs.source; }
bool operator<(const Stdin & rhs) const
{ return *source < *rhs.source; }
};
struct String {
ref<std::string> source;
bool operator==(const String & rhs) const
{ return *source == *rhs.source; }
bool operator!=(const String & rhs) const
{ return *source != *rhs.source; }
bool operator<(const String & rhs) const
{ return *source < *rhs.source; }
};
typedef std::variant<std::monostate, Stdin, String, SourcePath> Origin;
Origin origin = std::monostate();
Pos() { }
Pos(uint32_t line, uint32_t column, Origin origin)
: line(line), column(column), origin(origin) { }
Pos(Pos & other) = default;
Pos(const Pos & other) = default;
Pos(Pos && other) = default;
Pos(const Pos * other);
explicit operator bool() const { return line > 0; }
operator std::shared_ptr<Pos>() const;
/**
* Return the contents of the source file.
*/
std::optional<std::string> getSource() const;
void print(std::ostream & out, bool showOrigin) const;
std::optional<LinesOfCode> getCodeLines() const;
bool operator==(const Pos & rhs) const = default;
bool operator!=(const Pos & rhs) const = default;
bool operator<(const Pos & rhs) const;
struct LinesIterator {
using difference_type = size_t;
using value_type = std::string_view;
using reference = const std::string_view &;
using pointer = const std::string_view *;
using iterator_category = std::input_iterator_tag;
LinesIterator(): pastEnd(true) {}
explicit LinesIterator(std::string_view input): input(input), pastEnd(input.empty()) {
if (!pastEnd)
bump(true);
}
LinesIterator & operator++() {
bump(false);
return *this;
}
LinesIterator operator++(int) {
auto result = *this;
++*this;
return result;
}
reference operator*() const { return curLine; }
pointer operator->() const { return &curLine; }
bool operator!=(const LinesIterator & other) const {
return !(*this == other);
}
bool operator==(const LinesIterator & other) const {
return (pastEnd && other.pastEnd)
|| (std::forward_as_tuple(input.size(), input.data())
== std::forward_as_tuple(other.input.size(), other.input.data()));
}
private:
std::string_view input, curLine;
bool pastEnd = false;
void bump(bool atFirst);
};
};
std::ostream & operator<<(std::ostream & str, const Pos & pos);
}
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