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Combine AbstractPos, PosAdapter, and Pos

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Also move `SourcePath` into `libutil`.

These changes allow `error.hh` and `error.cc` to access source path and
position information, which we can use to produce better error messages
(for example, we could consider omitting filenames when two or more
consecutive stack frames originate from the same file).
This commit is contained in:
Rebecca Turner 2023-12-18 13:14:42 -08:00
parent 6a243e5ed2
commit 4feb7d9f71
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30 changed files with 561 additions and 489 deletions
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26
src/libexpr/nixexpr.hh
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@ -8,6 +8,7 @@
#include "symbol-table.hh"
#include "error.hh"
#include "chunked-vector.hh"
#include "position.hh"
namespace nix {
@ -28,27 +29,6 @@ public:
using EvalError::EvalError;
};
/**
* Position objects.
*/
struct Pos
{
uint32_t line;
uint32_t column;
struct none_tag { };
struct Stdin { ref<std::string> source; };
struct String { ref<std::string> source; };
typedef std::variant<none_tag, Stdin, String, SourcePath> Origin;
Origin origin;
explicit operator bool() const { return line > 0; }
operator std::shared_ptr<AbstractPos>() const;
};
class PosIdx {
friend class PosTable;
@ -81,7 +61,7 @@ public:
mutable uint32_t idx = std::numeric_limits<uint32_t>::max();
// Used for searching in PosTable::[].
explicit Origin(uint32_t idx): idx(idx), origin{Pos::none_tag()} {}
explicit Origin(uint32_t idx): idx(idx), origin{std::monostate()} {}
public:
const Pos::Origin origin;
@ -132,8 +112,6 @@ public:
inline PosIdx noPos = {};
std::ostream & operator << (std::ostream & str, const Pos & pos);
struct Env;
struct Value;