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Document ExprLambda fields

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We got confused what formals did and had to briefly figure it out. We
should just have docs, so these are some.

Change-Id: If3e794a401e69d022785cbfa0b0c2e2284f41f58
This commit is contained in:
Jade Lovelace 2024-03-29 18:26:40 -07:00
parent 6646b80396
commit 817322fbfb
1 changed files with 10 additions and 0 deletions
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10
src/libexpr/nixexpr.hh
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@ -243,6 +243,7 @@ struct Formal
Expr * def; Expr * def;
}; };
/** Attribute set destructuring in arguments of a lambda, if present */
struct Formals struct Formals
{ {
typedef std::vector<Formal> Formals_; typedef std::vector<Formal> Formals_;
@ -270,9 +271,18 @@ struct Formals
struct ExprLambda : Expr struct ExprLambda : Expr
{ {
/** Where the lambda is defined in Nix code. May be falsey if the
* position is not known. */
PosIdx pos; PosIdx pos;
/** Name of the lambda. This is set if the lambda is defined in a
* let-expression or an attribute set, such that there is a name.
* Lambdas may have a falsey symbol as the name if they are anonymous */
Symbol name; Symbol name;
/** The argument name of this particular lambda. Is a falsey symbol if there
* is no such argument. */
Symbol arg; Symbol arg;
/** Formals are present when the lambda destructures an attr set as
* argument, with or without ellipsis */
Formals * formals; Formals * formals;
Expr * body; Expr * body;
ExprLambda(PosIdx pos, Symbol arg, Formals * formals, Expr * body) ExprLambda(PosIdx pos, Symbol arg, Formals * formals, Expr * body)