#38163

Committed 07 Aug 2025 12:47PM UTC coverage: 69.322% (+43.6%) from 25.688%

Build # #38163

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Commit Message

Fix precompiling when there's no manifest (#59212)

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72.55

/base/strings/substring.jl

# This file is a part of Julia. License is MIT: https://julialang.org/license

"""
    SubString(s::AbstractString, i::Integer, j::Integer=lastindex(s))
    SubString(s::AbstractString, r::UnitRange{<:Integer})

Like [`getindex`](@ref), but returns a view into the parent string `s`
within range `i:j` or `r` respectively instead of making a copy.

The [`@views`](@ref) macro converts any string slices `s[i:j]` into
substrings `SubString(s, i, j)` in a block of code.

# Examples
```jldoctest
julia> SubString("abc", 1, 2)
"ab"

julia> SubString("abc", 1:2)
"ab"

julia> SubString("abc", 2)
"bc"
```
"""
struct SubString{T<:AbstractString} <: AbstractString
    string::T
    offset::Int
    ncodeunits::Int

    function SubString{T}(s::T, i::Int, j::Int) where T<:AbstractString
        i ≤ j || return new(s, 0, 0)
        @boundscheck begin
            checkbounds(s, i:j)
            @inbounds isvalid(s, i) || string_index_err(s, i)
            @inbounds isvalid(s, j) || string_index_err(s, j)
        end
        return new(s, i-1, nextind(s,j)-i)
    end
    function SubString{T}(s::T, i::Int, j::Int, ::Val{:noshift}) where T<:AbstractString
        @boundscheck if !(i == j == 0)
            si, sj = i + 1, prevind(s, j + i + 1)
            @inbounds isvalid(s, si) || string_index_err(s, si)
            @inbounds isvalid(s, sj) || string_index_err(s, sj)
        end
        new(s, i, j)
    end
end

@propagate_inbounds SubString(s::T, i::Int, j::Int) where {T<:AbstractString} = SubString{T}(s, i, j)
@propagate_inbounds SubString(s::T, i::Int, j::Int, v::Val{:noshift}) where {T<:AbstractString} = SubString{T}(s, i, j, v)
@propagate_inbounds SubString(s::AbstractString, i::Integer, j::Integer=lastindex(s)) = SubString(s, Int(i), Int(j))
@propagate_inbounds SubString(s::AbstractString, r::AbstractUnitRange{<:Integer}) = SubString(s, first(r), last(r))

@propagate_inbounds function SubString(s::SubString, i::Int, j::Int)
    @boundscheck i ≤ j && checkbounds(s, i:j)
    SubString(s.string, s.offset+i, s.offset+j)
end

SubString(s::AbstractString) = SubString(s, 1, lastindex(s)::Int)
SubString{T}(s::T) where {T<:AbstractString} = SubString{T}(s, 1, lastindex(s)::Int)

@propagate_inbounds view(s::AbstractString, r::AbstractUnitRange{<:Integer}) = SubString(s, r)
@propagate_inbounds maybeview(s::AbstractString, r::AbstractUnitRange{<:Integer}) = view(s, r)
@propagate_inbounds maybeview(s::AbstractString, args...) = getindex(s, args...)

convert(::Type{SubString{S}}, s::AbstractString) where {S<:AbstractString} =
    SubString(convert(S, s))::SubString{S}
convert(::Type{T}, s::T) where {T<:SubString} = s

# Regex match allows only Union{String, SubString{String}} so define conversion to this type
convert(::Type{Union{String, SubString{String}}}, s::String) = s
convert(::Type{Union{String, SubString{String}}}, s::SubString{String}) = s
convert(::Type{Union{String, SubString{String}}}, s::AbstractString) = convert(String, s)::String

function String(s::SubString{String})
    parent = s.string
    copy = GC.@preserve parent unsafe_string(pointer(parent, s.offset+1), s.ncodeunits)
    return copy
end

ncodeunits(s::SubString) = s.ncodeunits
codeunit(s::SubString) = codeunit(s.string)::CodeunitType
length(s::SubString) = length(s.string, s.offset+1, s.offset+s.ncodeunits)

function codeunit(s::SubString, i::Integer)
    @boundscheck checkbounds(s, i)
    @inbounds return codeunit(s.string, s.offset + i)
end

function iterate(s::SubString, i::Integer=firstindex(s))
    i == ncodeunits(s)+1 && return nothing
    @boundscheck checkbounds(s, i)
    y = iterate(s.string, s.offset + i)
    y === nothing && return nothing
    c, i = y::Tuple{AbstractChar,Int}
    return c, i - s.offset
end

function getindex(s::SubString, i::Integer)
    @boundscheck checkbounds(s, i)
    @inbounds return getindex(s.string, s.offset + i)
end

isascii(ss::SubString{String}) = isascii(codeunits(ss))

function isvalid(s::SubString, i::Integer)
    ib = true
    @boundscheck ib = checkbounds(Bool, s, i)
    @inbounds return ib && isvalid(s.string, s.offset + i)::Bool
end

thisind(s::SubString{String}, i::Int) = _thisind_str(s, i)
nextind(s::SubString{String}, i::Int) = _nextind_str(s, i)

parent(s::SubString) = s.string
parentindices(s::SubString) = (s.offset + 1 : thisind(s.string, s.offset + s.ncodeunits),)

function ==(a::Union{String, SubString{String}}, b::Union{String, SubString{String}})
    sizeof(a) == sizeof(b) && _memcmp(a, b) == 0
end

function cmp(a::SubString{String}, b::SubString{String})
    c = _memcmp(a, b)
    return c < 0 ? -1 : c > 0 ? +1 : cmp(sizeof(a), sizeof(b))
end

# don't make unnecessary copies when passing substrings to C functions
cconvert(::Type{Ptr{UInt8}}, s::SubString{String}) = s
cconvert(::Type{Ptr{Int8}}, s::SubString{String}) = s

function unsafe_convert(::Type{Ptr{R}}, s::SubString{String}) where R<:Union{Int8, UInt8}
    convert(Ptr{R}, pointer(s.string)) + s.offset
end

pointer(x::SubString{String}) = pointer(x.string) + x.offset
pointer(x::SubString{String}, i::Integer) = pointer(x.string) + x.offset + (i-1)

hash(data::SubString{String}, h::UInt) =
    GC.@preserve data hash_bytes(pointer(data), sizeof(data), UInt64(h), HASH_SECRET) % UInt

_isannotated(::SubString{T}) where {T} = _isannotated(T)

"""
    reverse(s::AbstractString)::AbstractString

Reverses a string. Technically, this function reverses the codepoints in a string and its
main utility is for reversed-order string processing, especially for reversed
regular-expression searches. See also [`reverseind`](@ref) to convert indices in `s` to
indices in `reverse(s)` and vice-versa, and `graphemes` from module `Unicode` to
operate on user-visible "characters" (graphemes) rather than codepoints.
See also [`Iterators.reverse`](@ref) for
reverse-order iteration without making a copy. Custom string types must implement the
`reverse` function themselves and should typically return a string with the same type
and encoding. If they return a string with a different encoding, they must also override
`reverseind` for that string type to satisfy `s[reverseind(s,i)] == reverse(s)[i]`.

# Examples
```jldoctest
julia> reverse("JuliaLang")
"gnaLailuJ"
```

!!! note
    The examples below may be rendered differently on different systems.
    The comments indicate how they're supposed to be rendered

Combining characters can lead to surprising results:

```jldoctest
julia> reverse("ax̂e") # hat is above x in the input, above e in the output
"êxa"

julia> using Unicode

julia> join(reverse(collect(graphemes("ax̂e")))) # reverses graphemes; hat is above x in both in- and output
"ex̂a"
```
"""
function reverse(s::Union{String,SubString{String}})::String
    # Read characters forwards from `s` and write backwards to `out`
    out = _string_n(sizeof(s))
    offs = sizeof(s) + 1
    for c in s
        offs -= ncodeunits(c)
        __unsafe_string!(out, c, offs)
    end
    return out
end

string(a::String)            = String(a)
string(a::SubString{String}) = String(a)

function Symbol(s::SubString{String})
    return ccall(:jl_symbol_n, Ref{Symbol}, (Ptr{UInt8}, Int), s, sizeof(s))
end

@inline function __unsafe_string!(out, c::Char, offs::Integer) # out is a (new) String (or StringVector)
    x = bswap(reinterpret(UInt32, c))
    n = ncodeunits(c)
    GC.@preserve out begin
        unsafe_store!(pointer(out, offs), x % UInt8)
        n == 1 && return n
        x >>= 8
        unsafe_store!(pointer(out, offs+1), x % UInt8)
        n == 2 && return n
        x >>= 8
        unsafe_store!(pointer(out, offs+2), x % UInt8)
        n == 3 && return n
        x >>= 8
        unsafe_store!(pointer(out, offs+3), x % UInt8)
    end
    return n
end

@assume_effects :nothrow @inline function __unsafe_string!(out, s::String, offs::Integer)
    n = sizeof(s)
    GC.@preserve s out unsafe_copyto!(pointer(out, offs), pointer(s), n)
    return n
end

@inline function __unsafe_string!(out, s::SubString{String}, offs::Integer)
    n = sizeof(s)
    GC.@preserve s out unsafe_copyto!(pointer(out, offs), pointer(s), n)
    return n
end

@assume_effects :nothrow @inline function __unsafe_string!(out, s::Symbol, offs::Integer)
    n = sizeof(s)
    GC.@preserve s out unsafe_copyto!(pointer(out, offs), unsafe_convert(Ptr{UInt8},s), n)
    return n
end

# nothrow needed here because for v in a can't prove the indexing is inbounds.
@assume_effects :foldable :nothrow string(a::Union{Char, String, Symbol}...) = _string(a...)

string(a::Union{Char, String, SubString{String}, Symbol}...) = _string(a...)

function _string(a::Union{Char, String, SubString{String}, Symbol}...)
    n = 0
    for v in a
        # 4 types is too many for automatic Union-splitting, so we split manually
        # and allow one specializable call site per concrete type
        if v isa Char
            n += ncodeunits(v)
        elseif v isa String
            n += sizeof(v)
        elseif v isa SubString{String}
            n += sizeof(v)
        else
            n += sizeof(v::Symbol)
        end
    end
    out = _string_n(n)
    offs = 1
    for v in a
        if v isa Char
            offs += __unsafe_string!(out, v, offs)
        elseif v isa String || v isa SubString{String}
            offs += __unsafe_string!(out, v, offs)
        else
            offs += __unsafe_string!(out, v::Symbol, offs)
        end
    end
    return out
end

# don't assume effects for general integers since we cannot know their implementation
# not nothrow because r<0 throws
@assume_effects :foldable repeat(s::String, r::BitInteger) = @invoke repeat(s::String, r::Integer)

function repeat(s::Union{String, SubString{String}}, r::Integer)
    r < 0 && throw(ArgumentError("can't repeat a string $r times"))
    r = UInt(r)::UInt
    r == 0 && return ""
    r == 1 && return String(s)
    n = sizeof(s)
    out = _string_n(n*r)
    if n == 1 # common case: repeating a single-byte string
        @inbounds b = codeunit(s, 1)
        memset(unsafe_convert(Ptr{UInt8}, out), b, r)
    else
        for i = 0:r-1
            GC.@preserve s out unsafe_copyto!(pointer(out, i*n+1), pointer(s), n)
        end
    end
    return out
end

function filter(f, s::Union{String, SubString{String}})
    out = StringVector(sizeof(s))
    offset = 1
    for c in s
        if f(c)
            offset += __unsafe_string!(out, c, offset)
        end
    end
    resize!(out, offset-1)
    sizehint!(out, offset-1)
    return String(out)
end

getindex(s::AbstractString, r::AbstractUnitRange{<:Integer}) = SubString(s, r)

1	# This file is a part of Julia. License is MIT: https://julialang.org/license
2
3	"""
4	SubString(s::AbstractString, i::Integer, j::Integer=lastindex(s))
5	SubString(s::AbstractString, r::UnitRange{<:Integer})
6
7	Like [`getindex`](@ref), but returns a view into the parent string `s`
8	within range `i:j` or `r` respectively instead of making a copy.
9
10	The [`@views`](@ref) macro converts any string slices `s[i:j]` into
11	substrings `SubString(s, i, j)` in a block of code.
12
13	# Examples
14	```jldoctest
15	julia> SubString("abc", 1, 2)
16	"ab"
17
18	julia> SubString("abc", 1:2)
19	"ab"
20
21	julia> SubString("abc", 2)
22	"bc"
23	```
24	"""
25	struct SubString{T<:AbstractString} <: AbstractString
26	string::T
27	offset::Int
28	ncodeunits::Int
29
30	function SubString{T}(s::T, i::Int, j::Int) where T<:AbstractString	341✔
31	i ≤ j \|\| return new(s, 0, 0)	412✔
32	@boundscheck begin	282✔
33	checkbounds(s, i:j)	282✔
34	@inbounds isvalid(s, i) \|\| string_index_err(s, i)	282✔
35	@inbounds isvalid(s, j) \|\| string_index_err(s, j)	282✔
36	end
37	return new(s, i-1, nextind(s,j)-i)	282✔
38	end
39	function SubString{T}(s::T, i::Int, j::Int, ::Val{:noshift}) where T<:AbstractString	7✔
40	@boundscheck if !(i == j == 0)	7✔
41	si, sj = i + 1, prevind(s, j + i + 1)	7✔
42	@inbounds isvalid(s, si) \|\| string_index_err(s, si)	7✔
43	@inbounds isvalid(s, sj) \|\| string_index_err(s, sj)	7✔
44	end
45	new(s, i, j)	7✔
46	end
47	end
48
49	@propagate_inbounds SubString(s::T, i::Int, j::Int) where {T<:AbstractString} = SubString{T}(s, i, j)	241,304✔
50	@propagate_inbounds SubString(s::T, i::Int, j::Int, v::Val{:noshift}) where {T<:AbstractString} = SubString{T}(s, i, j, v)	1,412✔
51	@propagate_inbounds SubString(s::AbstractString, i::Integer, j::Integer=lastindex(s)) = SubString(s, Int(i), Int(j))	25,144✔
52	@propagate_inbounds SubString(s::AbstractString, r::AbstractUnitRange{<:Integer}) = SubString(s, first(r), last(r))	197,030✔
53
54	@propagate_inbounds function SubString(s::SubString, i::Int, j::Int)	82✔
55	@boundscheck i ≤ j && checkbounds(s, i:j)	10,293✔
56	SubString(s.string, s.offset+i, s.offset+j)	10,281✔
57	end
58
59	SubString(s::AbstractString) = SubString(s, 1, lastindex(s)::Int)	6,203✔
60	SubString{T}(s::T) where {T<:AbstractString} = SubString{T}(s, 1, lastindex(s)::Int)	226✔
61
62	@propagate_inbounds view(s::AbstractString, r::AbstractUnitRange{<:Integer}) = SubString(s, r)	74,257✔
63	@propagate_inbounds maybeview(s::AbstractString, r::AbstractUnitRange{<:Integer}) = view(s, r)	73,469✔
64	@propagate_inbounds maybeview(s::AbstractString, args...) = getindex(s, args...)	6✔
65
66	convert(::Type{SubString{S}}, s::AbstractString) where {S<:AbstractString} =	61✔
67	SubString(convert(S, s))::SubString{S}
68	convert(::Type{T}, s::T) where {T<:SubString} = s	2✔
69
70	# Regex match allows only Union{String, SubString{String}} so define conversion to this type
71	convert(::Type{Union{String, SubString{String}}}, s::String) = s	×
72	convert(::Type{Union{String, SubString{String}}}, s::SubString{String}) = s	×
73	convert(::Type{Union{String, SubString{String}}}, s::AbstractString) = convert(String, s)::String	×
74
75	function String(s::SubString{String})
76	parent = s.string	996,995✔
77	copy = GC.@preserve parent unsafe_string(pointer(parent, s.offset+1), s.ncodeunits)	996,995✔
78	return copy	991,877✔
79	end
80
81	ncodeunits(s::SubString) = s.ncodeunits	21,113,558✔
82	codeunit(s::SubString) = codeunit(s.string)::CodeunitType	×
83	length(s::SubString) = length(s.string, s.offset+1, s.offset+s.ncodeunits)	×
84
85	function codeunit(s::SubString, i::Integer)
86	@boundscheck checkbounds(s, i)	73,115✔
87	@inbounds return codeunit(s.string, s.offset + i)	73,115✔
88	end
89
90	function iterate(s::SubString, i::Integer=firstindex(s))	313✔
91	i == ncodeunits(s)+1 && return nothing	1,213,492✔
92	@boundscheck checkbounds(s, i)	448,491✔
93	y = iterate(s.string, s.offset + i)	895,754✔
94	y === nothing && return nothing	448,487✔
95	c, i = y::Tuple{AbstractChar,Int}	448,152✔
96	return c, i - s.offset	448,487✔
97	end
98
99	function getindex(s::SubString, i::Integer)	318✔
100	@boundscheck checkbounds(s, i)	73,860✔
101	@inbounds return getindex(s.string, s.offset + i)	146,414✔
102	end
103
104	isascii(ss::SubString{String}) = isascii(codeunits(ss))	×
105
106	function isvalid(s::SubString, i::Integer)	78,485✔
107	ib = true	1,164✔
108	@boundscheck ib = checkbounds(Bool, s, i)	13,360,954✔
109	@inbounds return ib && isvalid(s.string, s.offset + i)::Bool	26,643,236✔
110	end
111
112	thisind(s::SubString{String}, i::Int) = _thisind_str(s, i)	120,654✔
113	nextind(s::SubString{String}, i::Int) = _nextind_str(s, i)	9,033✔
114
115	parent(s::SubString) = s.string	1✔
116	parentindices(s::SubString) = (s.offset + 1 : thisind(s.string, s.offset + s.ncodeunits),)	1✔
117
118	function ==(a::Union{String, SubString{String}}, b::Union{String, SubString{String}})
119	sizeof(a) == sizeof(b) && _memcmp(a, b) == 0	2,122,350✔
120	end
121
122	function cmp(a::SubString{String}, b::SubString{String})	×
123	c = _memcmp(a, b)	×
124	return c < 0 ? -1 : c > 0 ? +1 : cmp(sizeof(a), sizeof(b))	×
125	end
126
127	# don't make unnecessary copies when passing substrings to C functions
128	cconvert(::Type{Ptr{UInt8}}, s::SubString{String}) = s	×
129	cconvert(::Type{Ptr{Int8}}, s::SubString{String}) = s	×
130
131	function unsafe_convert(::Type{Ptr{R}}, s::SubString{String}) where R<:Union{Int8, UInt8}
132	convert(Ptr{R}, pointer(s.string)) + s.offset	1,093,306✔
133	end
134
135	pointer(x::SubString{String}) = pointer(x.string) + x.offset	561,853✔
136	pointer(x::SubString{String}, i::Integer) = pointer(x.string) + x.offset + (i-1)	×
137
138	hash(data::SubString{String}, h::UInt) =	488,168✔
139	GC.@preserve data hash_bytes(pointer(data), sizeof(data), UInt64(h), HASH_SECRET) % UInt
140
141	_isannotated(::SubString{T}) where {T} = _isannotated(T)	×
142
143	"""
144	reverse(s::AbstractString)::AbstractString
145
146	Reverses a string. Technically, this function reverses the codepoints in a string and its
147	main utility is for reversed-order string processing, especially for reversed
148	regular-expression searches. See also [`reverseind`](@ref) to convert indices in `s` to
149	indices in `reverse(s)` and vice-versa, and `graphemes` from module `Unicode` to
150	operate on user-visible "characters" (graphemes) rather than codepoints.
151	See also [`Iterators.reverse`](@ref) for
152	reverse-order iteration without making a copy. Custom string types must implement the
153	`reverse` function themselves and should typically return a string with the same type
154	and encoding. If they return a string with a different encoding, they must also override
155	`reverseind` for that string type to satisfy `s[reverseind(s,i)] == reverse(s)[i]`.
156
157	# Examples
158	```jldoctest
159	julia> reverse("JuliaLang")
160	"gnaLailuJ"
161	```
162
163	!!! note
164	The examples below may be rendered differently on different systems.
165	The comments indicate how they're supposed to be rendered
166
167	Combining characters can lead to surprising results:
168
169	```jldoctest
170	julia> reverse("ax̂e") # hat is above x in the input, above e in the output
171	"êxa"
172
173	julia> using Unicode
174
175	julia> join(reverse(collect(graphemes("ax̂e")))) # reverses graphemes; hat is above x in both in- and output
176	"ex̂a"
177	```
178	"""
179	function reverse(s::Union{String,SubString{String}})::String	×
180	# Read characters forwards from `s` and write backwards to `out`
181	out = _string_n(sizeof(s))	×
182	offs = sizeof(s) + 1	×
183	for c in s	×
184	offs -= ncodeunits(c)	×
185	__unsafe_string!(out, c, offs)	×
186	end	×
187	return out	×
188	end
189
UNCOV 190	string(a::String) = String(a)	×
191	string(a::SubString{String}) = String(a)	2,741✔
192
193	function Symbol(s::SubString{String})
194	return ccall(:jl_symbol_n, Ref{Symbol}, (Ptr{UInt8}, Int), s, sizeof(s))	174✔
195	end
196
197	@inline function __unsafe_string!(out, c::Char, offs::Integer) # out is a (new) String (or StringVector)
198	x = bswap(reinterpret(UInt32, c))	82,613✔
199	n = ncodeunits(c)	82,613✔
200	GC.@preserve out begin	82,613✔
201	unsafe_store!(pointer(out, offs), x % UInt8)	82,613✔
202	n == 1 && return n	82,613✔
203	x >>= 8	76✔
204	unsafe_store!(pointer(out, offs+1), x % UInt8)	76✔
205	n == 2 && return n	76✔
206	x >>= 8	57✔
207	unsafe_store!(pointer(out, offs+2), x % UInt8)	57✔
208	n == 3 && return n	57✔
209	x >>= 8	17✔
210	unsafe_store!(pointer(out, offs+3), x % UInt8)	17✔
211	end
212	return n	17✔
213	end
214
UNCOV 215	@assume_effects :nothrow @inline function __unsafe_string!(out, s::String, offs::Integer)	×
UNCOV 216	n = sizeof(s)	×
UNCOV 217	GC.@preserve s out unsafe_copyto!(pointer(out, offs), pointer(s), n)	×
UNCOV 218	return n	×
219	end
220
UNCOV 221	@inline function __unsafe_string!(out, s::SubString{String}, offs::Integer)	×
UNCOV 222	n = sizeof(s)	×
UNCOV 223	GC.@preserve s out unsafe_copyto!(pointer(out, offs), pointer(s), n)	×
UNCOV 224	return n	×
225	end
226
UNCOV 227	@assume_effects :nothrow @inline function __unsafe_string!(out, s::Symbol, offs::Integer)	×
UNCOV 228	n = sizeof(s)	×
UNCOV 229	GC.@preserve s out unsafe_copyto!(pointer(out, offs), unsafe_convert(Ptr{UInt8},s), n)	×
UNCOV 230	return n	×
231	end
232
233	# nothrow needed here because for v in a can't prove the indexing is inbounds.
234	@assume_effects :foldable :nothrow string(a::Union{Char, String, Symbol}...) = _string(a...)	2,654,761✔
235
236	string(a::Union{Char, String, SubString{String}, Symbol}...) = _string(a...)	914,484✔
237
238	function _string(a::Union{Char, String, SubString{String}, Symbol}...)
239	n = 0	125✔
240	for v in a	125✔
241	# 4 types is too many for automatic Union-splitting, so we split manually
242	# and allow one specializable call site per concrete type
243	if v isa Char	125✔
244	n += ncodeunits(v)	125✔
UNCOV 245	elseif v isa String	×
UNCOV 246	n += sizeof(v)	×
UNCOV 247	elseif v isa SubString{String}	×
UNCOV 248	n += sizeof(v)	×
249	else
UNCOV 250	n += sizeof(v::Symbol)	×
251	end
252	end	125✔
253	out = _string_n(n)	125✔
254	offs = 1	125✔
255	for v in a	125✔
256	if v isa Char	125✔
257	offs += __unsafe_string!(out, v, offs)	125✔
UNCOV 258	elseif v isa String \|\| v isa SubString{String}	×
UNCOV 259	offs += __unsafe_string!(out, v, offs)	×
260	else
UNCOV 261	offs += __unsafe_string!(out, v::Symbol, offs)	×
262	end
263	end	125✔
264	return out	125✔
265	end
266
267	# don't assume effects for general integers since we cannot know their implementation
268	# not nothrow because r<0 throws
269	@assume_effects :foldable repeat(s::String, r::BitInteger) = @invoke repeat(s::String, r::Integer)	2,009,767✔
270
271	function repeat(s::Union{String, SubString{String}}, r::Integer)	45✔
272	r < 0 && throw(ArgumentError("can't repeat a string $r times"))	155✔
273	r = UInt(r)::UInt	156✔
274	r == 0 && return ""	155✔
275	r == 1 && return String(s)	127✔
276	n = sizeof(s)	20✔
277	out = _string_n(n*r)	20✔
278	if n == 1 # common case: repeating a single-byte string	20✔
279	@inbounds b = codeunit(s, 1)	10✔
280	memset(unsafe_convert(Ptr{UInt8}, out), b, r)	10✔
281	else
282	for i = 0:r-1	10✔
283	GC.@preserve s out unsafe_copyto!(pointer(out, i*n+1), pointer(s), n)	329✔
284	end	628✔
285	end
286	return out	20✔
287	end
288
289	function filter(f, s::Union{String, SubString{String}})	3✔
290	out = StringVector(sizeof(s))	3✔
291	offset = 1	3✔
292	for c in s	6✔
293	if f(c)	131✔
294	offset += __unsafe_string!(out, c, offset)	75✔
295	end
296	end	170✔
297	resize!(out, offset-1)	3✔
298	sizehint!(out, offset-1)	3✔
299	return String(out)	3✔
300	end
301
302	getindex(s::AbstractString, r::AbstractUnitRange{<:Integer}) = SubString(s, r)	260✔

JuliaLang / julia / #38163

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