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

@testset "string normalization" begin
    # normalize_string (Unicode normalization etc.):
    @test normalize_string("\u006e\u0303", :NFC) == "\u00f1"
    @test "\u006e\u0303" == normalize_string("\u00f1", :NFD)
    @test normalize_string("\ufb00", :NFC) != "ff"
    @test normalize_string("\ufb00", :NFKC) == "ff"
    @test normalize_string("\u006e\u0303\ufb00", :NFKC) == "\u00f1"*"ff"
    @test normalize_string("\u00f1\ufb00", :NFKD) == "\u006e\u0303"*"ff"
    @test normalize_string("\u006e\u0303", compose=true) == "\u00f1"
    @test "\u006e\u0303" == normalize_string("\u00f1", decompose=true)
    @test normalize_string("\u006e\u0303\u00b5",compat=true) == "\u00f1\u03bc"
    @test normalize_string("Σσς",casefold=true) == "σσσ"
    @test normalize_string("∕⁄", lump=true) == "//"
    @test normalize_string("\ua\n\r\r\ua", newline2lf=true) == "\ua\ua\ua\ua"
    @test normalize_string("\ua\n\r\r\ua", newline2ls=true) == "\u2028\u2028\u2028\u2028"
    @test normalize_string("\ua\n\r\r\ua", newline2ps=true) == "\u2029\u2029\u2029\u2029"
    @test normalize_string("\u00f1", stripmark=true) == "n"
    @test isempty(normalize_string("\u00ad", stripignore=true))
    @test normalize_string("\t\r", stripcc=true) == "  "
    @test normalize_string("\t\r", stripcc=true, newline2ls=true) == " \u2028"
    @test normalize_string("\u0072\u0307\u0323", :NFC) == "\u1E5B\u0307" #26917
end

@testset "unicode sa#15" begin
    #Tests from Unicode SA#15, "Unicode normalization forms"
    #http://www.unicode.org/reports/tr15/

    @testset "canonical equivalence" begin
        let ==(a::Array{Char},b::Array{Char}) = normalize_string(string(a...), :NFC)==normalize_string(string(b...), :NFC)
            ==(a,b) = Base.:(==)(a,b)
            @test ['C', '̧'] == ['Ç']
            @test ['q', '̇', '̣'] == ['q', '̣', '̇']
            @test ['가'] == ['ᄀ', 'ᅡ']
            @test ['Ω'] == ['Ω']
        end
    end

    @testset "compatibility equivalence" begin
        let ==(a::Array{Char},b::Array{Char}) = normalize_string(string(a...), :NFKC)==normalize_string(string(b...), :NFKC)
            ==(a,b) = Base.:(==)(a,b)
            @test ['ℌ'] == ['ℍ'] == ['H']
            @test ['ﻨ'] == ['ﻧ'] == ['ﻦ'] == ['ﻥ']
            @test ['①'] == ['1']
            @test ['ｶ'] == ['カ']
            @test ['︷'] == ['{']
            @test ['⁹'] == ['₉']
            @test ['㌀'] == ['ア', 'パ', 'ー', 'ト']
            @test ['¼'] == ['1', '⁄', '4']
            @test ['ǆ'] == ['d', 'ž']
        end
    end

    @testset "singletons" begin
        @test normalize_string("\U212b", :NFD) == "A\U030a"
        @test normalize_string("\U212b", :NFC) == "\U00c5"
        @test normalize_string("\U2126", :NFC) == normalize_string("\U2126", :NFD) == "\U03a9"
    end

    @testset "canonical composites" begin
        @test normalize_string("\U00c5", :NFC) == "\U00c5"
        @test normalize_string("\U00c5", :NFD) == "A\U030a"
        @test normalize_string("\U00f4", :NFC) == "\U00f4"
        @test normalize_string("\U00f4", :NFD) == "o\U0302"
    end

    @testset "multiple combining marks" begin
        @test normalize_string("\U1e69", :NFD) == "s\U0323\U0307"
        @test normalize_string("\U1e69", :NFC) == "\U1e69"
        @test normalize_string("\U1e0b\U0323", :NFD) == "d\U0323\U0307"
        @test normalize_string("\U1e0b\U0323", :NFC) == "\U1e0d\U0307"
        @test normalize_string("q\U0307\U0323", :NFC) == "q\U0323\U0307"
        @test normalize_string("q\U0307\U0323", :NFD) == "q\U0323\U0307"
    end

    @testset "compatibility composites" begin
        @test normalize_string("\Ufb01", :NFD) == normalize_string("\Ufb01", :NFC) == "\Ufb01"
        @test normalize_string("\Ufb01", :NFKD) == normalize_string("\Ufb01", :NFKC) == "fi"
        @test normalize_string("2\U2075", :NFD) == normalize_string("2\U2075", :NFC) == "2\U2075"
        @test normalize_string("2\U2075", :NFKD) == normalize_string("2\U2075", :NFKC) == "25"
        @test normalize_string("\U1e9b\U0323", :NFD) == "\U017f\U0323\U0307"
        @test normalize_string("\U1e9b\U0323", :NFC) == "\U1e9b\U0323"
        @test normalize_string("\U1e9b\U0323", :NFKD) == "s\U0323\U0307"
        @test normalize_string("\U1e9b\U0323", :NFKC) == "\U1e69"
    end
end

@testset "#5939 uft8proc character predicates" begin
    alower=['a', 'd', 'j', 'y', 'z']
    ulower=['α', 'β', 'γ', 'δ', 'ф', 'я']
    for c in vcat(alower,ulower)
        @test islower(c) == true
        @test isupper(c) == false
        @test isdigit(c) == false
        @test isnumber(c) == false
    end

    aupper=['A', 'D', 'J', 'Y', 'Z']
    uupper= ['Δ', 'Γ', 'Π', 'Ψ', 'ǅ', 'Ж', 'Д']

    for c in vcat(aupper,uupper)
        @test islower(c) == false
        @test isupper(c) == true
        @test isdigit(c) == false
        @test isnumber(c) == false
    end

    nocase=['א','ﺵ']
    alphas=vcat(alower,ulower,aupper,uupper,nocase)

    for c in alphas
        @test isalpha(c) == true
        @test isnumber(c) == false
    end

    anumber=['0', '1', '5', '9']
    unumber=['٣', '٥', '٨', '¹', 'ⅳ' ]

    for c in anumber
        @test isdigit(c) == true
        @test isnumber(c) == true
    end
    for c in unumber
        @test isdigit(c) == false
        @test isnumber(c) == true
    end

    alnums=vcat(alphas,anumber,unumber)
    for c in alnums
        @test isalnum(c) == true
        @test ispunct(c) == false
    end

    asymbol = ['(',')', '~', '$' ]
    usymbol = ['∪', '∩', '⊂', '⊃', '√', '€', '¥', '↰', '△', '§']

    apunct =['.',',',';',':','&']
    upunct =['‡', '؟', '჻' ]

    for c in vcat(apunct,upunct)
        @test ispunct(c) == true
        @test isalnum(c) == false
    end

    for c in vcat(alnums,asymbol,usymbol,apunct,upunct)
        @test isprint(c) == true
        @test isgraph(c) == true
        @test isspace(c) == false
        @test iscntrl(c) == false
    end

    NBSP = Char(0x0000A0)
    ENSPACE = Char(0x002002)
    EMSPACE = Char(0x002003)
    THINSPACE = Char(0x002009)
    ZWSPACE = Char(0x002060)

    uspace = [ENSPACE, EMSPACE, THINSPACE]
    aspace = [' ']
    acntrl_space = ['\t', '\n', '\v', '\f', '\r']
    for c in vcat(aspace,uspace)
        @test isspace(c) == true
        @test isprint(c) == true
        @test isgraph(c) == false
    end

    for c in vcat(acntrl_space)
        @test isspace(c) == true
        @test isprint(c) == false
        @test isgraph(c) == false
    end

    @test isspace(ZWSPACE) == false # zero-width space

    acontrol = [ Char(0x001c), Char(0x001d), Char(0x001e), Char(0x001f)]
    latincontrol = [ Char(0x0080), Char(0x0085) ]
    ucontrol = [ Char(0x200E), Char(0x202E) ]

    for c in vcat(acontrol, acntrl_space, latincontrol)
        @test iscntrl(c) == true
        @test isalnum(c) == false
        @test isprint(c) == false
        @test isgraph(c) == false
    end

    for c in ucontrol  #non-latin1 controls
        if c!=Char(0x0085)
            @test iscntrl(c) == false
            @test isspace(c) == false
            @test isalnum(c) == false
            @test isprint(c) == false
            @test isgraph(c) == false
        end
    end

    @test  all(isspace,"  \t   \n   \r  ")
    @test !all(isgraph,"  \t   \n   \r  ")
    @test !all(isprint,"  \t   \n   \r  ")
    @test !all(isalpha,"  \t   \n   \r  ")
    @test !all(isnumber,"  \t   \n   \r  ")
    @test !all(ispunct,"  \t   \n   \r  ")

    @test !all(isspace,"ΣβΣβ")
    @test  all(isalpha,"ΣβΣβ")
    @test  all(isgraph,"ΣβΣβ")
    @test  all(isprint,"ΣβΣβ")
    @test !all(isupper,"ΣβΣβ")
    @test !all(islower,"ΣβΣβ")
    @test !all(isnumber,"ΣβΣβ")
    @test !all(iscntrl,"ΣβΣβ")
    @test !all(ispunct,"ΣβΣβ")

    @test  all(isnumber,"23435")
    @test  all(isdigit,"23435")
    @test  all(isalnum,"23435")
    @test !all(isalpha,"23435")
    @test  all(iscntrl,string(Char(0x0080)))
    @test  all(ispunct, "‡؟჻")

    @test  isxdigit('0')
    @test  isxdigit('a')
    @test !isxdigit('x')
    @test !isxdigit('g')
end

@testset "utf8proc" begin
    # check utf8proc handling of CN category constants
    let c_ll = 'β', c_cn = '\u038B'
        @test Base.UTF8proc.category_code(c_ll) == Base.UTF8proc.UTF8PROC_CATEGORY_LL
        # check codepoint with category code CN
        @test Base.UTF8proc.category_code(c_cn) == Base.UTF8proc.UTF8PROC_CATEGORY_CN
    end
end

@testset "graphemes" begin
    let grphtest = (("b\u0300lahβlahb\u0302láh", ["b\u0300","l","a","h",
                                                  "β","l","a","h",
                                                  "b\u0302","l","á","h"]),
                    ("", String[]),
                    ("x\u0302", ["x\u0302"]),
                    ("\U1d4c1\u0302", ["\U1d4c1\u0302"]),
                    ("\U1d4c1\u0302\U1d4c1\u0300", ["\U1d4c1\u0302",
                                                    "\U1d4c1\u0300"]),
                    ("x",["x"]),
                    ("abc",["a","b","c"]))
        for T in (String,GenericString)
            for nf in (:NFC, :NFD)
                for (s, g) in grphtest
                    s_ = T(normalize_string(s, nf))
                    g_ = map(s -> normalize_string(s, nf), g)
                    # #9261
                    if length(s_) > 0
                        @test typeof(first(graphemes(s_))) == SubString{typeof(s_)}
                    end
                    grph = collect(graphemes(s_))
                    @test eltype(grph) == SubString{typeof(s_)}
                    @test grph == g_
                    @test length(graphemes(s_)) == length(grph)
                end
                S = [T(normalize_string(s)) for (s,g) in grphtest]
                G = map(graphemes, S)
                @test map(graphemes, sort!(S)) == sort!(G)
            end
        end
    end
end

@testset "#3721, #6939 up-to-date character widths" begin
    @test charwidth('\U1f355') == 2
    @test strwidth("\U1f355") == 2
    @test strwidth(GenericString("\U1f355")) == 2
    @test strwidth("\U1f355\u0302") == 2
    @test strwidth(GenericString("\U1f355\u0302")) == 2
end

@testset "#10958 handling of embedded NUL chars" begin
    @test length("\0w") == length("\0α") == 2
    @test strwidth("\0w") == strwidth("\0α") == 1
    @test normalize_string("\0W", casefold=true) == "\0w"
end

@testset "ut8proc_map with GenericString" begin
    @test normalize_string(GenericString("\u006e\u0303"), :NFC) == "\u00f1"
end

@testset "normalize_string keywords" begin
    @test_throws ArgumentError normalize_string("\u006e\u0303", compose=false, compat=true)
    @test_throws ArgumentError normalize_string("\u006e\u0303", compose=false, stripmark=true)
end

@testset "fastplus" begin
    @test lowercase('A') == 'a'
    @test uppercase('a') == 'A'

    @test is_assigned_char('A')
end

@testset "isspace" begin
    @test isspace(' ')
    @test isspace('\t')
    @test isspace('\r')
    @test isspace('\u85')
    @test isspace('\ua0')
    @test !isspace('\ufffd')
    @test !isspace('\U10ffff')
end

@testset "grapheme iterators" begin
    let str = ascii("This is a test")
        g = graphemes(str)
        h = hash(str)
        @test hash(g) == h
        @test convert(GenericString, g) == str
        @test repr(g) == "length-14 GraphemeIterator{String} for \"$str\""
    end
end

@testset "#22693: substring graphemes" begin
    g = graphemes(SubString("123α56789", 1, 6))
    @test eltype(g) == SubString{String}
    @test collect(g) == ["1","2","3","α","5"]
end
