swh:1:snp:a72e953ecd624a7df6e6196bbdd05851996c5e40
Tip revision: 3b76b25b648cc1fa6187b118c685819a4111a5d2 authored by Kristoffer Carlsson on 19 July 2022, 15:11:36 UTC
Set VERSION to 1.6.7 (#46077)
Set VERSION to 1.6.7 (#46077)
Tip revision: 3b76b25
namedtuple.jl
# This file is a part of Julia. License is MIT: https://julialang.org/license
"""
NamedTuple
`NamedTuple`s are, as their name suggests, named [`Tuple`](@ref)s. That is, they're a
tuple-like collection of values, where each entry has a unique name, represented as a
[`Symbol`](@ref). Like `Tuple`s, `NamedTuple`s are immutable; neither the names nor the values
can be modified in place after construction.
Accessing the value associated with a name in a named tuple can be done using field
access syntax, e.g. `x.a`, or using [`getindex`](@ref), e.g. `x[:a]`. A tuple of the
names can be obtained using [`keys`](@ref), and a tuple of the values can be obtained
using [`values`](@ref).
!!! note
Iteration over `NamedTuple`s produces the *values* without the names. (See example
below.) To iterate over the name-value pairs, use the [`pairs`](@ref) function.
The [`@NamedTuple`](@ref) macro can be used for conveniently declaring `NamedTuple` types.
# Examples
```jldoctest
julia> x = (a=1, b=2)
(a = 1, b = 2)
julia> x.a
1
julia> x[:a]
1
julia> keys(x)
(:a, :b)
julia> values(x)
(1, 2)
julia> collect(x)
2-element Vector{Int64}:
1
2
julia> collect(pairs(x))
2-element Vector{Pair{Symbol, Int64}}:
:a => 1
:b => 2
```
In a similar fashion as to how one can define keyword arguments programmatically,
a named tuple can be created by giving a pair `name::Symbol => value` or splatting
an iterator yielding such pairs after a semicolon inside a tuple literal:
```jldoctest
julia> (; :a => 1)
(a = 1,)
julia> keys = (:a, :b, :c); values = (1, 2, 3);
julia> (; zip(keys, values)...)
(a = 1, b = 2, c = 3)
```
As in keyword arguments, identifiers and dot expressions imply names:
```jldoctest
julia> x = 0
0
julia> t = (; x)
(x = 0,)
julia> (; t.x)
(x = 0,)
```
!!! compat "Julia 1.5"
Implicit names from identifiers and dot expressions are available as of Julia 1.5.
"""
Core.NamedTuple
if nameof(@__MODULE__) === :Base
@eval function NamedTuple{names,T}(args::Tuple) where {names, T <: Tuple}
if length(args) != length(names::Tuple)
throw(ArgumentError("Wrong number of arguments to named tuple constructor."))
end
# Note T(args) might not return something of type T; e.g.
# Tuple{Type{Float64}}((Float64,)) returns a Tuple{DataType}
$(Expr(:splatnew, :(NamedTuple{names,T}), :(T(args))))
end
function NamedTuple{names}(nt::NamedTuple) where {names}
if @generated
idx = Int[ fieldindex(nt, names[n]) for n in 1:length(names) ]
types = Tuple{(fieldtype(nt, idx[n]) for n in 1:length(idx))...}
Expr(:new, :(NamedTuple{names, $types}), Any[ :(getfield(nt, $(idx[n]))) for n in 1:length(idx) ]...)
else
types = Tuple{(fieldtype(typeof(nt), names[n]) for n in 1:length(names))...}
NamedTuple{names, types}(Tuple(getfield(nt, n) for n in 1:length(names)))
end
end
NamedTuple{names, T}(itr) where {names, T <: Tuple} = NamedTuple{names, T}(T(itr))
NamedTuple{names}(itr) where {names} = NamedTuple{names}(Tuple(itr))
NamedTuple(itr) = (; itr...)
end # if Base
length(t::NamedTuple) = nfields(t)
iterate(t::NamedTuple, iter=1) = iter > nfields(t) ? nothing : (getfield(t, iter), iter + 1)
rest(t::NamedTuple) = t
@inline rest(t::NamedTuple{names}, i::Int) where {names} = NamedTuple{rest(names,i)}(t)
firstindex(t::NamedTuple) = 1
lastindex(t::NamedTuple) = nfields(t)
getindex(t::NamedTuple, i::Int) = getfield(t, i)
getindex(t::NamedTuple, i::Symbol) = getfield(t, i)
indexed_iterate(t::NamedTuple, i::Int, state=1) = (getfield(t, i), i+1)
isempty(::NamedTuple{()}) = true
isempty(::NamedTuple) = false
empty(::NamedTuple) = NamedTuple()
prevind(@nospecialize(t::NamedTuple), i::Integer) = Int(i)-1
nextind(@nospecialize(t::NamedTuple), i::Integer) = Int(i)+1
convert(::Type{NamedTuple{names,T}}, nt::NamedTuple{names,T}) where {names,T<:Tuple} = nt
convert(::Type{NamedTuple{names}}, nt::NamedTuple{names}) where {names} = nt
function convert(::Type{NamedTuple{names,T}}, nt::NamedTuple{names}) where {names,T<:Tuple}
NamedTuple{names,T}(T(nt))
end
if nameof(@__MODULE__) === :Base
Tuple(nt::NamedTuple) = (nt...,)
(::Type{T})(nt::NamedTuple) where {T <: Tuple} = convert(T, Tuple(nt))
end
function show(io::IO, t::NamedTuple)
n = nfields(t)
for i = 1:n
# if field types aren't concrete, show full type
if typeof(getfield(t, i)) !== fieldtype(typeof(t), i)
show(io, typeof(t))
print(io, "(")
show(io, Tuple(t))
print(io, ")")
return
end
end
if n == 0
print(io, "NamedTuple()")
else
typeinfo = get(io, :typeinfo, Any)
print(io, "(")
for i = 1:n
print(io, fieldname(typeof(t),i), " = ")
show(IOContext(io, :typeinfo =>
t isa typeinfo <: NamedTuple ? fieldtype(typeinfo, i) : Any),
getfield(t, i))
if n == 1
print(io, ",")
elseif i < n
print(io, ", ")
end
end
print(io, ")")
end
end
eltype(::Type{T}) where T<:NamedTuple = nteltype(T)
nteltype(::Type) = Any
nteltype(::Type{NamedTuple{names,T}} where names) where {T} = eltype(T)
==(a::NamedTuple{n}, b::NamedTuple{n}) where {n} = Tuple(a) == Tuple(b)
==(a::NamedTuple, b::NamedTuple) = false
isequal(a::NamedTuple{n}, b::NamedTuple{n}) where {n} = isequal(Tuple(a), Tuple(b))
isequal(a::NamedTuple, b::NamedTuple) = false
_nt_names(::NamedTuple{names}) where {names} = names
_nt_names(::Type{T}) where {names,T<:NamedTuple{names}} = names
hash(x::NamedTuple, h::UInt) = xor(objectid(_nt_names(x)), hash(Tuple(x), h))
isless(a::NamedTuple{n}, b::NamedTuple{n}) where {n} = isless(Tuple(a), Tuple(b))
# TODO: case where one argument's names are a prefix of the other's
same_names(::NamedTuple{names}...) where {names} = true
same_names(::NamedTuple...) = false
# NOTE: this method signature makes sure we don't define map(f)
function map(f, nt::NamedTuple{names}, nts::NamedTuple...) where names
if !same_names(nt, nts...)
throw(ArgumentError("Named tuple names do not match."))
end
NamedTuple{names}(map(f, map(Tuple, (nt, nts...))...))
end
@pure function merge_names(an::Tuple{Vararg{Symbol}}, bn::Tuple{Vararg{Symbol}})
@nospecialize an bn
names = Symbol[an...]
for n in bn
if !sym_in(n, an)
push!(names, n)
end
end
(names...,)
end
@pure function merge_types(names::Tuple{Vararg{Symbol}}, a::Type{<:NamedTuple}, b::Type{<:NamedTuple})
@nospecialize names a b
bn = _nt_names(b)
return Tuple{Any[ fieldtype(sym_in(names[n], bn) ? b : a, names[n]) for n in 1:length(names) ]...}
end
"""
merge(a::NamedTuple, bs::NamedTuple...)
Construct a new named tuple by merging two or more existing ones, in a left-associative
manner. Merging proceeds left-to-right, between pairs of named tuples, and so the order of fields
present in both the leftmost and rightmost named tuples take the same position as they are found in the
leftmost named tuple. However, values are taken from matching fields in the rightmost named tuple that
contains that field. Fields present in only the rightmost named tuple of a pair are appended at the end.
A fallback is implemented for when only a single named tuple is supplied,
with signature `merge(a::NamedTuple)`.
!!! compat "Julia 1.1"
Merging 3 or more `NamedTuple` requires at least Julia 1.1.
# Examples
```jldoctest
julia> merge((a=1, b=2, c=3), (b=4, d=5))
(a = 1, b = 4, c = 3, d = 5)
```
```jldoctest
julia> merge((a=1, b=2), (b=3, c=(d=1,)), (c=(d=2,),))
(a = 1, b = 3, c = (d = 2,))
```
"""
function merge(a::NamedTuple{an}, b::NamedTuple{bn}) where {an, bn}
if @generated
names = merge_names(an, bn)
types = merge_types(names, a, b)
vals = Any[ :(getfield($(sym_in(names[n], bn) ? :b : :a), $(QuoteNode(names[n])))) for n in 1:length(names) ]
:( NamedTuple{$names,$types}(($(vals...),)) )
else
names = merge_names(an, bn)
types = merge_types(names, typeof(a), typeof(b))
NamedTuple{names,types}(map(n->getfield(sym_in(n, bn) ? b : a, n), names))
end
end
merge(a::NamedTuple, b::NamedTuple{()}) = a
merge(a::NamedTuple{()}, b::NamedTuple{()}) = a
merge(a::NamedTuple{()}, b::NamedTuple) = b
merge(a::NamedTuple, b::Iterators.Pairs{<:Any,<:Any,<:Any,<:NamedTuple}) = merge(a, b.data)
merge(a::NamedTuple, b::Iterators.Zip{<:Tuple{Any,Any}}) = merge(a, NamedTuple{Tuple(b.is[1])}(b.is[2]))
merge(a::NamedTuple, b::NamedTuple, cs::NamedTuple...) = merge(merge(a, b), cs...)
merge(a::NamedTuple) = a
"""
merge(a::NamedTuple, iterable)
Interpret an iterable of key-value pairs as a named tuple, and perform a merge.
```jldoctest
julia> merge((a=1, b=2, c=3), [:b=>4, :d=>5])
(a = 1, b = 4, c = 3, d = 5)
```
"""
function merge(a::NamedTuple, itr)
names = Symbol[]
vals = Any[]
inds = IdDict{Symbol,Int}()
for (k::Symbol, v) in itr
oldind = get(inds, k, 0)
if oldind > 0
vals[oldind] = v
else
push!(names, k)
push!(vals, v)
inds[k] = length(names)
end
end
merge(a, NamedTuple{(names...,)}((vals...,)))
end
keys(nt::NamedTuple{names}) where {names} = names
values(nt::NamedTuple) = Tuple(nt)
haskey(nt::NamedTuple, key::Union{Integer, Symbol}) = isdefined(nt, key)
get(nt::NamedTuple, key::Union{Integer, Symbol}, default) = haskey(nt, key) ? getfield(nt, key) : default
get(f::Callable, nt::NamedTuple, key::Union{Integer, Symbol}) = haskey(nt, key) ? getfield(nt, key) : f()
tail(t::NamedTuple{names}) where names = NamedTuple{tail(names)}(t)
front(t::NamedTuple{names}) where names = NamedTuple{front(names)}(t)
@pure function diff_names(an::Tuple{Vararg{Symbol}}, bn::Tuple{Vararg{Symbol}})
@nospecialize an bn
names = Symbol[]
for n in an
if !sym_in(n, bn)
push!(names, n)
end
end
(names...,)
end
"""
structdiff(a::NamedTuple{an}, b::Union{NamedTuple{bn},Type{NamedTuple{bn}}}) where {an,bn}
Construct a copy of named tuple `a`, except with fields that exist in `b` removed.
`b` can be a named tuple, or a type of the form `NamedTuple{field_names}`.
"""
function structdiff(a::NamedTuple{an}, b::Union{NamedTuple{bn}, Type{NamedTuple{bn}}}) where {an, bn}
if @generated
names = diff_names(an, bn)
idx = Int[ fieldindex(a, names[n]) for n in 1:length(names) ]
types = Tuple{Any[ fieldtype(a, idx[n]) for n in 1:length(idx) ]...}
vals = Any[ :(getfield(a, $(idx[n]))) for n in 1:length(idx) ]
:( NamedTuple{$names,$types}(($(vals...),)) )
else
names = diff_names(an, bn)
types = Tuple{Any[ fieldtype(typeof(a), names[n]) for n in 1:length(names) ]...}
NamedTuple{names,types}(map(n->getfield(a, n), names))
end
end
structdiff(a::NamedTuple{an}, b::Union{NamedTuple{an}, Type{NamedTuple{an}}}) where {an} = (;)
"""
setindex(nt::NamedTuple, val, key::Symbol)
Constructs a new `NamedTuple` with the key `key` set to `val`.
If `key` is already in the keys of `nt`, `val` replaces the old value.
```jldoctest
julia> nt = (a = 3,)
(a = 3,)
julia> Base.setindex(nt, 33, :b)
(a = 3, b = 33)
julia> Base.setindex(nt, 4, :a)
(a = 4,)
julia> Base.setindex(nt, "a", :a)
(a = "a",)
```
"""
function setindex(nt::NamedTuple, v, idx::Symbol)
merge(nt, (; idx => v))
end
"""
@NamedTuple{key1::Type1, key2::Type2, ...}
@NamedTuple begin key1::Type1; key2::Type2; ...; end
This macro gives a more convenient syntax for declaring `NamedTuple` types. It returns a `NamedTuple`
type with the given keys and types, equivalent to `NamedTuple{(:key1, :key2, ...), Tuple{Type1,Type2,...}}`.
If the `::Type` declaration is omitted, it is taken to be `Any`. The `begin ... end` form allows the
declarations to be split across multiple lines (similar to a `struct` declaration), but is otherwise
equivalent.
For example, the tuple `(a=3.1, b="hello")` has a type `NamedTuple{(:a, :b),Tuple{Float64,String}}`, which
can also be declared via `@NamedTuple` as:
```jldoctest
julia> @NamedTuple{a::Float64, b::String}
NamedTuple{(:a, :b), Tuple{Float64, String}}
julia> @NamedTuple begin
a::Float64
b::String
end
NamedTuple{(:a, :b), Tuple{Float64, String}}
```
!!! compat "Julia 1.5"
This macro is available as of Julia 1.5.
"""
macro NamedTuple(ex)
Meta.isexpr(ex, :braces) || Meta.isexpr(ex, :block) ||
throw(ArgumentError("@NamedTuple expects {...} or begin...end"))
decls = filter(e -> !(e isa LineNumberNode), ex.args)
all(e -> e isa Symbol || Meta.isexpr(e, :(::)), decls) ||
throw(ArgumentError("@NamedTuple must contain a sequence of name or name::type expressions"))
vars = [QuoteNode(e isa Symbol ? e : e.args[1]) for e in decls]
types = [esc(e isa Symbol ? :Any : e.args[2]) for e in decls]
return :(NamedTuple{($(vars...),), Tuple{$(types...)}})
end