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

# string escaping & unescaping
cx = Any[
    0x00000000      '\0'        "\\0"
    0x00000001      '\x01'      "\\x01"
    0x00000006      '\x06'      "\\x06"
    0x00000007      '\a'        "\\a"
    0x00000008      '\b'        "\\b"
    0x00000009      '\t'        "\\t"
    0x0000000a      '\n'        "\\n"
    0x0000000b      '\v'        "\\v"
    0x0000000c      '\f'        "\\f"
    0x0000000d      '\r'        "\\r"
    0x0000000e      '\x0e'      "\\x0e"
    0x0000001a      '\x1a'      "\\x1a"
    0x0000001b      '\e'        "\\e"
    0x0000001c      '\x1c'      "\\x1c"
    0x0000001f      '\x1f'      "\\x1f"
    0x00000020      ' '         " "
    0x0000002f      '/'         "/"
    0x00000030      '0'         "0"
    0x00000039      '9'         "9"
    0x0000003a      ':'         ":"
    0x00000040      '@'         "@"
    0x00000041      'A'         "A"
    0x0000005a      'Z'         "Z"
    0x0000005b      '['         "["
    0x00000060      '`'         "`"
    0x00000061      'a'         "a"
    0x0000007a      'z'         "z"
    0x0000007b      '{'         "{"
    0x0000007e      '~'         "~"
    0x0000007f      '\x7f'      "\\x7f"
    0x000000bf      '\ubf'      "\\ubf"
    0x000000ff      '\uff'      "\\uff"
    0x00000100      '\u100'     "\\u100"
    0x000001ff      '\u1ff'     "\\u1ff"
    0x00000fff      '\ufff'     "\\ufff"
    0x00001000      '\u1000'    "\\u1000"
    0x00001fff      '\u1fff'    "\\u1fff"
    0x0000ffff      '\uffff'    "\\uffff"
    0x00010000      '\U10000'   "\\U10000"
    0x0001ffff      '\U1ffff'   "\\U1ffff"
    0x0002ffff      '\U2ffff'   "\\U2ffff"
    0x00030000      '\U30000'   "\\U30000"
    0x000dffff      '\Udffff'   "\\Udffff"
    0x000e0000      '\Ue0000'   "\\Ue0000"
    0x000effff      '\Ueffff'   "\\Ueffff"
    0x000f0000      '\Uf0000'   "\\Uf0000"
    0x000fffff      '\Ufffff'   "\\Ufffff"
    0x00100000      '\U100000'  "\\U100000"
    0x0010ffff      '\U10ffff'  "\\U10ffff"
]

for i = 1:size(cx,1)
    cp, ch, st = cx[i,:]
    @test cp == convert(UInt32, ch)
    @test string(ch) == unescape_string(st)
    if isascii(ch) || !isprint(ch)
        @test st == escape_string(string(ch))
    end
    for j = 1:size(cx,1)
        str = string(ch, cx[j,2])
        @test str == unescape_string(escape_string(str))
    end
    @test repr(ch) == "'$(isprint(ch) ? ch : st)'"
end

for i = 0:0x7f, p = ["","\0","x","xxx","\x7f","\uFF","\uFFF",
                     "\uFFFF","\U10000","\U10FFF","\U10FFFF"]
    c = Char(i)
    cp = string(c,p)
    op = string(Char(div(i,8)), oct(i%8), p)
    hp = string(Char(div(i,16)), hex(i%16), p)
    @test string(unescape_string(string("\\",oct(i,1),p))) == cp
    @test string(unescape_string(string("\\",oct(i,2),p))) == cp
    @test string(unescape_string(string("\\",oct(i,3),p))) == cp
    @test string(unescape_string(string("\\",oct(i,4),p))) == op
    @test string(unescape_string(string("\\x",hex(i,1),p))) == cp
    @test string(unescape_string(string("\\x",hex(i,2),p))) == cp
    @test string(unescape_string(string("\\x",hex(i,3),p))) == hp
end

@test "\z" == unescape_string("\z") == "z"
@test "\X" == unescape_string("\X") == "X"
@test "\AbC" == unescape_string("\AbC") == "AbC"

@test "\0" == unescape_string("\\0")
@test "\1" == unescape_string("\\1")
@test "\7" == unescape_string("\\7")
@test "\0x" == unescape_string("\\0x")
@test "\1x" == unescape_string("\\1x")
@test "\7x" == unescape_string("\\7x")
@test "\00" == unescape_string("\\00")
@test "\01" == unescape_string("\\01")
@test "\07" == unescape_string("\\07")
@test "\70" == unescape_string("\\70")
@test "\71" == unescape_string("\\71")
@test "\77" == unescape_string("\\77")
@test "\00x" == unescape_string("\\00x")
@test "\01x" == unescape_string("\\01x")
@test "\07x" == unescape_string("\\07x")
@test "\70x" == unescape_string("\\70x")
@test "\71x" == unescape_string("\\71x")
@test "\77x" == unescape_string("\\77x")
@test "\000" == unescape_string("\\000")
@test "\001" == unescape_string("\\001")
@test "\007" == unescape_string("\\007")
@test "\070" == unescape_string("\\070")
@test "\071" == unescape_string("\\071")
@test "\077" == unescape_string("\\077")
@test "\170" == unescape_string("\\170")
@test "\171" == unescape_string("\\171")
@test "\177" == unescape_string("\\177")
@test "\0001" == unescape_string("\\0001")
@test "\0011" == unescape_string("\\0011")
@test "\0071" == unescape_string("\\0071")
@test "\0701" == unescape_string("\\0701")
@test "\0711" == unescape_string("\\0711")
@test "\0771" == unescape_string("\\0771")
@test "\1701" == unescape_string("\\1701")
@test "\1711" == unescape_string("\\1711")
@test "\1771" == unescape_string("\\1771")

@test "\x0" == unescape_string("\\x0")
@test "\x1" == unescape_string("\\x1")
@test "\xf" == unescape_string("\\xf")
@test "\xF" == unescape_string("\\xF")
@test "\x0x" == unescape_string("\\x0x")
@test "\x1x" == unescape_string("\\x1x")
@test "\xfx" == unescape_string("\\xfx")
@test "\xFx" == unescape_string("\\xFx")
@test "\x00" == unescape_string("\\x00")
@test "\x01" == unescape_string("\\x01")
@test "\x0f" == unescape_string("\\x0f")
@test "\x0F" == unescape_string("\\x0F")

# Tests of join()
@test join([]) == ""
@test join(["a"],"?") == "a"
@test join("HELLO",'-') == "H-E-L-L-O"
@test join(1:5, ", ", " and ") == "1, 2, 3, 4 and 5"
@test join(["apples", "bananas", "pineapples"], ", ", " and ") == "apples, bananas and pineapples"

# issue #9178 `join` calls `done()` twice on the iterables
type i9178
    nnext::Int64
    ndone::Int64
end
Base.start(jt::i9178) = (jt.nnext=0 ; jt.ndone=0 ; 0)
Base.done(jt::i9178, n) = (jt.ndone += 1 ; n > 3)
Base.next(jt::i9178, n) = (jt.nnext += 1 ; ("$(jt.nnext),$(jt.ndone)", n+1))
@test join(i9178(0,0), ";") == "1,1;2,2;3,3;4,4"

# quotes + interpolation (issue #455)
@test "$("string")" == "string"
arr = ["a","b","c"]
@test "[$(join(arr, " - "))]" == "[a - b - c]"

# join with empty input
myio = IOBuffer()
join(myio, "", "", 1)
@test isempty(takebuf_array(myio))

# unescape_chars
@test Base.unescape_chars("\\t","t") == "t"
@test_throws ArgumentError unescape_string(IOBuffer(), string('\\',"xZ"))
@test_throws ArgumentError unescape_string(IOBuffer(), string('\\',"777"))

# 11659
# The indentation code was not correctly counting tab stops
@test Base.indentation("      \t") == (8, true)
@test Base.indentation("  \tfoob") == (8, false)
@test Base.indentation(" \t \t")   == (16, true)

@test Base.unindent("\tfoo",0) == "\tfoo"
@test Base.unindent("\tfoo",4) == "    foo"
@test Base.unindent("    \tfoo",4) == "    foo"
@test Base.unindent("\t\n    \tfoo",4) == "    \n    foo"
@test Base.unindent("\tfoo\tbar",4) == "    foo     bar"
@test Base.unindent("\n\tfoo",4) == "\n    foo"
@test Base.unindent("\n    \tfoo",4) == "\n    foo"
@test Base.unindent("\n\t\n    \tfoo",4) == "\n    \n    foo"
@test Base.unindent("\n\tfoo\tbar",4) == "\n    foo     bar"