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add some comments

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This commit is contained in:
Ben Burdette 2020-06-04 11:53:19 -06:00
parent 721943e1d4
commit 94427ffee3
3 changed files with 42 additions and 18 deletions
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21
src/libutil/error.hh
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@ -22,6 +22,23 @@
namespace nix {
/*
This file defines two main structs/classes used in nix error handling.
ErrorInfo provides a standard payload of error information, with conversion to string
happening in the logger rather than at the call site.
BaseError is the ancestor of nix specific exceptions (and Interrupted), and contains
an ErrorInfo.
ErrorInfo structs are sent to the logger as part of an exception, or directly with the
logError or logWarning macros.
See the error-demo.cc program for usage examples.
*/
typedef enum {
lvlError = 0,
lvlWarn,
@ -32,6 +49,7 @@ typedef enum {
lvlVomit
} Verbosity;
// ErrPos indicates the location of an error in a nix file.
struct ErrPos {
int line = 0;
int column = 0;
@ -42,6 +60,7 @@ struct ErrPos {
return line != 0;
}
// convert from the Pos struct, found in libexpr.
template <class P>
ErrPos& operator=(const P &pos)
{
@ -65,8 +84,6 @@ struct NixCode {
std::optional<string> nextLineOfCode;
};
// -------------------------------------------------
// ErrorInfo.
struct ErrorInfo {
Verbosity level;
string name;