mirror of
https://github.com/walterschell/Lua.git
synced 2024-11-29 16:04:36 +00:00
424 lines
13 KiB
Lua
424 lines
13 KiB
Lua
|
-- $Id: testes/pm.lua $
|
|||
|
|
-- See Copyright Notice in file all.lua
|
|||
|
|
|
|||
|
|
print('testing pattern matching')
|
|||
|
|
|
|||
|
|
local function checkerror (msg, f, ...)
|
|||
|
|
local s, err = pcall(f, ...)
|
|||
|
|
assert(not s and string.find(err, msg))
|
|||
|
|
end
|
|||
|
|
|
|||
|
|
|
|||
|
|
local function f (s, p)
|
|||
|
|
local i,e = string.find(s, p)
|
|||
|
|
if i then return string.sub(s, i, e) end
|
|||
|
|
end
|
|||
|
|
|
|||
|
|
local a,b = string.find('', '') -- empty patterns are tricky
|
|||
|
|
assert(a == 1 and b == 0);
|
|||
|
|
a,b = string.find('alo', '')
|
|||
|
|
assert(a == 1 and b == 0)
|
|||
|
|
a,b = string.find('a\0o a\0o a\0o', 'a', 1) -- first position
|
|||
|
|
assert(a == 1 and b == 1)
|
|||
|
|
a,b = string.find('a\0o a\0o a\0o', 'a\0o', 2) -- starts in the midle
|
|||
|
|
assert(a == 5 and b == 7)
|
|||
|
|
a,b = string.find('a\0o a\0o a\0o', 'a\0o', 9) -- starts in the midle
|
|||
|
|
assert(a == 9 and b == 11)
|
|||
|
|
a,b = string.find('a\0a\0a\0a\0\0ab', '\0ab', 2); -- finds at the end
|
|||
|
|
assert(a == 9 and b == 11);
|
|||
|
|
a,b = string.find('a\0a\0a\0a\0\0ab', 'b') -- last position
|
|||
|
|
assert(a == 11 and b == 11)
|
|||
|
|
assert(not string.find('a\0a\0a\0a\0\0ab', 'b\0')) -- check ending
|
|||
|
|
assert(not string.find('', '\0'))
|
|||
|
|
assert(string.find('alo123alo', '12') == 4)
|
|||
|
|
assert(not string.find('alo123alo', '^12'))
|
|||
|
|
|
|||
|
|
assert(string.match("aaab", ".*b") == "aaab")
|
|||
|
|
assert(string.match("aaa", ".*a") == "aaa")
|
|||
|
|
assert(string.match("b", ".*b") == "b")
|
|||
|
|
|
|||
|
|
assert(string.match("aaab", ".+b") == "aaab")
|
|||
|
|
assert(string.match("aaa", ".+a") == "aaa")
|
|||
|
|
assert(not string.match("b", ".+b"))
|
|||
|
|
|
|||
|
|
assert(string.match("aaab", ".?b") == "ab")
|
|||
|
|
assert(string.match("aaa", ".?a") == "aa")
|
|||
|
|
assert(string.match("b", ".?b") == "b")
|
|||
|
|
|
|||
|
|
assert(f('aloALO', '%l*') == 'alo')
|
|||
|
|
assert(f('aLo_ALO', '%a*') == 'aLo')
|
|||
|
|
|
|||
|
|
assert(f(" \n\r*&\n\r xuxu \n\n", "%g%g%g+") == "xuxu")
|
|||
|
|
|
|||
|
|
assert(f('aaab', 'a*') == 'aaa');
|
|||
|
|
assert(f('aaa', '^.*$') == 'aaa');
|
|||
|
|
assert(f('aaa', 'b*') == '');
|
|||
|
|
assert(f('aaa', 'ab*a') == 'aa')
|
|||
|
|
assert(f('aba', 'ab*a') == 'aba')
|
|||
|
|
assert(f('aaab', 'a+') == 'aaa')
|
|||
|
|
assert(f('aaa', '^.+$') == 'aaa')
|
|||
|
|
assert(not f('aaa', 'b+'))
|
|||
|
|
assert(not f('aaa', 'ab+a'))
|
|||
|
|
assert(f('aba', 'ab+a') == 'aba')
|
|||
|
|
assert(f('a$a', '.$') == 'a')
|
|||
|
|
assert(f('a$a', '.%$') == 'a$')
|
|||
|
|
assert(f('a$a', '.$.') == 'a$a')
|
|||
|
|
assert(not f('a$a', '$$'))
|
|||
|
|
assert(not f('a$b', 'a$'))
|
|||
|
|
assert(f('a$a', '$') == '')
|
|||
|
|
assert(f('', 'b*') == '')
|
|||
|
|
assert(not f('aaa', 'bb*'))
|
|||
|
|
assert(f('aaab', 'a-') == '')
|
|||
|
|
assert(f('aaa', '^.-$') == 'aaa')
|
|||
|
|
assert(f('aabaaabaaabaaaba', 'b.*b') == 'baaabaaabaaab')
|
|||
|
|
assert(f('aabaaabaaabaaaba', 'b.-b') == 'baaab')
|
|||
|
|
assert(f('alo xo', '.o$') == 'xo')
|
|||
|
|
assert(f(' \n isto <20> assim', '%S%S*') == 'isto')
|
|||
|
|
assert(f(' \n isto <20> assim', '%S*$') == 'assim')
|
|||
|
|
assert(f(' \n isto <20> assim', '[a-z]*$') == 'assim')
|
|||
|
|
assert(f('um caracter ? extra', '[^%sa-z]') == '?')
|
|||
|
|
assert(f('', 'a?') == '')
|
|||
|
|
assert(f('<EFBFBD>', '<EFBFBD>?') == '<EFBFBD>')
|
|||
|
|
assert(f('<EFBFBD>bl', '<EFBFBD>?b?l?') == '<EFBFBD>bl')
|
|||
|
|
assert(f(' <20>bl', '<EFBFBD>?b?l?') == '')
|
|||
|
|
assert(f('aa', '^aa?a?a') == 'aa')
|
|||
|
|
assert(f(']]]<5D>b', '[^]]') == '<EFBFBD>')
|
|||
|
|
assert(f("0alo alo", "%x*") == "0a")
|
|||
|
|
assert(f("alo alo", "%C+") == "alo alo")
|
|||
|
|
print('+')
|
|||
|
|
|
|||
|
|
|
|||
|
|
local function f1 (s, p)
|
|||
|
|
p = string.gsub(p, "%%([0-9])", function (s)
|
|||
|
|
return "%" .. (tonumber(s)+1)
|
|||
|
|
end)
|
|||
|
|
p = string.gsub(p, "^(^?)", "%1()", 1)
|
|||
|
|
p = string.gsub(p, "($?)$", "()%1", 1)
|
|||
|
|
local t = {string.match(s, p)}
|
|||
|
|
return string.sub(s, t[1], t[#t] - 1)
|
|||
|
|
end
|
|||
|
|
|
|||
|
|
assert(f1('alo alx 123 b\0o b\0o', '(..*) %1') == "b\0o b\0o")
|
|||
|
|
assert(f1('axz123= 4= 4 34', '(.+)=(.*)=%2 %1') == '3= 4= 4 3')
|
|||
|
|
assert(f1('=======', '^(=*)=%1$') == '=======')
|
|||
|
|
assert(not string.match('==========', '^([=]*)=%1$'))
|
|||
|
|
|
|||
|
|
local function range (i, j)
|
|||
|
|
if i <= j then
|
|||
|
|
return i, range(i+1, j)
|
|||
|
|
end
|
|||
|
|
end
|
|||
|
|
|
|||
|
|
local abc = string.char(range(0, 127)) .. string.char(range(128, 255));
|
|||
|
|
|
|||
|
|
assert(string.len(abc) == 256)
|
|||
|
|
|
|||
|
|
local function strset (p)
|
|||
|
|
local res = {s=''}
|
|||
|
|
string.gsub(abc, p, function (c) res.s = res.s .. c end)
|
|||
|
|
return res.s
|
|||
|
|
end;
|
|||
|
|
|
|||
|
|
assert(string.len(strset('[\200-\210]')) == 11)
|
|||
|
|
|
|||
|
|
assert(strset('[a-z]') == "abcdefghijklmnopqrstuvwxyz")
|
|||
|
|
assert(strset('[a-z%d]') == strset('[%da-uu-z]'))
|
|||
|
|
assert(strset('[a-]') == "-a")
|
|||
|
|
assert(strset('[^%W]') == strset('[%w]'))
|
|||
|
|
assert(strset('[]%%]') == '%]')
|
|||
|
|
assert(strset('[a%-z]') == '-az')
|
|||
|
|
assert(strset('[%^%[%-a%]%-b]') == '-[]^ab')
|
|||
|
|
assert(strset('%Z') == strset('[\1-\255]'))
|
|||
|
|
assert(strset('.') == strset('[\1-\255%z]'))
|
|||
|
|
print('+');
|
|||
|
|
|
|||
|
|
assert(string.match("alo xyzK", "(%w+)K") == "xyz")
|
|||
|
|
assert(string.match("254 K", "(%d*)K") == "")
|
|||
|
|
assert(string.match("alo ", "(%w*)$") == "")
|
|||
|
|
assert(not string.match("alo ", "(%w+)$"))
|
|||
|
|
assert(string.find("(<28>lo)", "%(<28>") == 1)
|
|||
|
|
local a, b, c, d, e = string.match("<EFBFBD>lo alo", "^(((.).).* (%w*))$")
|
|||
|
|
assert(a == '<EFBFBD>lo alo' and b == '<EFBFBD>l' and c == '<EFBFBD>' and d == 'alo' and e == nil)
|
|||
|
|
a, b, c, d = string.match('0123456789', '(.+(.?)())')
|
|||
|
|
assert(a == '0123456789' and b == '' and c == 11 and d == nil)
|
|||
|
|
print('+')
|
|||
|
|
|
|||
|
|
assert(string.gsub('<EFBFBD>lo <20>lo', '<EFBFBD>', 'x') == 'xlo xlo')
|
|||
|
|
assert(string.gsub('alo <20>lo ', ' +$', '') == 'alo <20>lo') -- trim
|
|||
|
|
assert(string.gsub(' alo alo ', '^%s*(.-)%s*$', '%1') == 'alo alo') -- double trim
|
|||
|
|
assert(string.gsub('alo alo \n 123\n ', '%s+', ' ') == 'alo alo 123 ')
|
|||
|
|
local t = "ab<EFBFBD> d"
|
|||
|
|
a, b = string.gsub(t, '(.)', '%1@')
|
|||
|
|
assert('@'..a == string.gsub(t, '', '@') and b == 5)
|
|||
|
|
a, b = string.gsub('ab<EFBFBD>d', '(.)', '%0@', 2)
|
|||
|
|
assert(a == 'a@b@<40>d' and b == 2)
|
|||
|
|
assert(string.gsub('alo alo', '()[al]', '%1') == '12o 56o')
|
|||
|
|
assert(string.gsub("abc=xyz", "(%w*)(%p)(%w+)", "%3%2%1-%0") ==
|
|||
|
|
"xyz=abc-abc=xyz")
|
|||
|
|
assert(string.gsub("abc", "%w", "%1%0") == "aabbcc")
|
|||
|
|
assert(string.gsub("abc", "%w+", "%0%1") == "abcabc")
|
|||
|
|
assert(string.gsub('<EFBFBD><EFBFBD><EFBFBD>', '$', '\0<EFBFBD><EFBFBD>') == '<EFBFBD><EFBFBD><EFBFBD>\0<EFBFBD><EFBFBD>')
|
|||
|
|
assert(string.gsub('', '^', 'r') == 'r')
|
|||
|
|
assert(string.gsub('', '$', 'r') == 'r')
|
|||
|
|
print('+')
|
|||
|
|
|
|||
|
|
|
|||
|
|
do -- new (5.3.3) semantics for empty matches
|
|||
|
|
assert(string.gsub("a b cd", " *", "-") == "-a-b-c-d-")
|
|||
|
|
|
|||
|
|
local res = ""
|
|||
|
|
local sub = "a \nbc\t\td"
|
|||
|
|
local i = 1
|
|||
|
|
for p, e in string.gmatch(sub, "()%s*()") do
|
|||
|
|
res = res .. string.sub(sub, i, p - 1) .. "-"
|
|||
|
|
i = e
|
|||
|
|
end
|
|||
|
|
assert(res == "-a-b-c-d-")
|
|||
|
|
end
|
|||
|
|
|
|||
|
|
|
|||
|
|
assert(string.gsub("um (dois) tres (quatro)", "(%(%w+%))", string.upper) ==
|
|||
|
|
"um (DOIS) tres (QUATRO)")
|
|||
|
|
|
|||
|
|
do
|
|||
|
|
local function setglobal (n,v) rawset(_G, n, v) end
|
|||
|
|
string.gsub("a=roberto,roberto=a", "(%w+)=(%w%w*)", setglobal)
|
|||
|
|
assert(_G.a=="roberto" and _G.roberto=="a")
|
|||
|
|
_G.a = nil; _G.roberto = nil
|
|||
|
|
end
|
|||
|
|
|
|||
|
|
function f(a,b) return string.gsub(a,'.',b) end
|
|||
|
|
assert(string.gsub("trocar tudo em |teste|b| <20> |beleza|al|", "|([^|]*)|([^|]*)|", f) ==
|
|||
|
|
"trocar tudo em bbbbb <20> alalalalalal")
|
|||
|
|
|
|||
|
|
local function dostring (s) return load(s, "")() or "" end
|
|||
|
|
assert(string.gsub("alo $a='x'$ novamente $return a$",
|
|||
|
|
"$([^$]*)%$",
|
|||
|
|
dostring) == "alo novamente x")
|
|||
|
|
|
|||
|
|
local x = string.gsub("$x=string.gsub('alo', '.', string.upper)$ assim vai para $return x$",
|
|||
|
|
"$([^$]*)%$", dostring)
|
|||
|
|
assert(x == ' assim vai para ALO')
|
|||
|
|
_G.a, _G.x = nil
|
|||
|
|
|
|||
|
|
local t = {}
|
|||
|
|
local s = 'a alo jose joao'
|
|||
|
|
local r = string.gsub(s, '()(%w+)()', function (a,w,b)
|
|||
|
|
assert(string.len(w) == b-a);
|
|||
|
|
t[a] = b-a;
|
|||
|
|
end)
|
|||
|
|
assert(s == r and t[1] == 1 and t[3] == 3 and t[7] == 4 and t[13] == 4)
|
|||
|
|
|
|||
|
|
|
|||
|
|
local function isbalanced (s)
|
|||
|
|
return not string.find(string.gsub(s, "%b()", ""), "[()]")
|
|||
|
|
end
|
|||
|
|
|
|||
|
|
assert(isbalanced("(9 ((8))(\0) 7) \0\0 a b ()(c)() a"))
|
|||
|
|
assert(not isbalanced("(9 ((8) 7) a b (\0 c) a"))
|
|||
|
|
assert(string.gsub("alo 'oi' alo", "%b''", '"') == 'alo " alo')
|
|||
|
|
|
|||
|
|
|
|||
|
|
local t = {"apple", "orange", "lime"; n=0}
|
|||
|
|
assert(string.gsub("x and x and x", "x", function () t.n=t.n+1; return t[t.n] end)
|
|||
|
|
== "apple and orange and lime")
|
|||
|
|
|
|||
|
|
t = {n=0}
|
|||
|
|
string.gsub("first second word", "%w%w*", function (w) t.n=t.n+1; t[t.n] = w end)
|
|||
|
|
assert(t[1] == "first" and t[2] == "second" and t[3] == "word" and t.n == 3)
|
|||
|
|
|
|||
|
|
t = {n=0}
|
|||
|
|
assert(string.gsub("first second word", "%w+",
|
|||
|
|
function (w) t.n=t.n+1; t[t.n] = w end, 2) == "first second word")
|
|||
|
|
assert(t[1] == "first" and t[2] == "second" and t[3] == undef)
|
|||
|
|
|
|||
|
|
checkerror("invalid replacement value %(a table%)",
|
|||
|
|
string.gsub, "alo", ".", {a = {}})
|
|||
|
|
checkerror("invalid capture index %%2", string.gsub, "alo", ".", "%2")
|
|||
|
|
checkerror("invalid capture index %%0", string.gsub, "alo", "(%0)", "a")
|
|||
|
|
checkerror("invalid capture index %%1", string.gsub, "alo", "(%1)", "a")
|
|||
|
|
checkerror("invalid use of '%%'", string.gsub, "alo", ".", "%x")
|
|||
|
|
|
|||
|
|
|
|||
|
|
if not _soft then
|
|||
|
|
print("big strings")
|
|||
|
|
local a = string.rep('a', 300000)
|
|||
|
|
assert(string.find(a, '^a*.?$'))
|
|||
|
|
assert(not string.find(a, '^a*.?b$'))
|
|||
|
|
assert(string.find(a, '^a-.?$'))
|
|||
|
|
|
|||
|
|
-- bug in 5.1.2
|
|||
|
|
a = string.rep('a', 10000) .. string.rep('b', 10000)
|
|||
|
|
assert(not pcall(string.gsub, a, 'b'))
|
|||
|
|
end
|
|||
|
|
|
|||
|
|
-- recursive nest of gsubs
|
|||
|
|
local function rev (s)
|
|||
|
|
return string.gsub(s, "(.)(.+)", function (c,s1) return rev(s1)..c end)
|
|||
|
|
end
|
|||
|
|
|
|||
|
|
local x = "abcdef"
|
|||
|
|
assert(rev(rev(x)) == x)
|
|||
|
|
|
|||
|
|
|
|||
|
|
-- gsub with tables
|
|||
|
|
assert(string.gsub("alo alo", ".", {}) == "alo alo")
|
|||
|
|
assert(string.gsub("alo alo", "(.)", {a="AA", l=""}) == "AAo AAo")
|
|||
|
|
assert(string.gsub("alo alo", "(.).", {a="AA", l="K"}) == "AAo AAo")
|
|||
|
|
assert(string.gsub("alo alo", "((.)(.?))", {al="AA", o=false}) == "AAo AAo")
|
|||
|
|
|
|||
|
|
assert(string.gsub("alo alo", "().", {'x','yy','zzz'}) == "xyyzzz alo")
|
|||
|
|
|
|||
|
|
t = {}; setmetatable(t, {__index = function (t,s) return string.upper(s) end})
|
|||
|
|
assert(string.gsub("a alo b hi", "%w%w+", t) == "a ALO b HI")
|
|||
|
|
|
|||
|
|
|
|||
|
|
-- tests for gmatch
|
|||
|
|
local a = 0
|
|||
|
|
for i in string.gmatch('abcde', '()') do assert(i == a+1); a=i end
|
|||
|
|
assert(a==6)
|
|||
|
|
|
|||
|
|
t = {n=0}
|
|||
|
|
for w in string.gmatch("first second word", "%w+") do
|
|||
|
|
t.n=t.n+1; t[t.n] = w
|
|||
|
|
end
|
|||
|
|
assert(t[1] == "first" and t[2] == "second" and t[3] == "word")
|
|||
|
|
|
|||
|
|
t = {3, 6, 9}
|
|||
|
|
for i in string.gmatch ("xuxx uu ppar r", "()(.)%2") do
|
|||
|
|
assert(i == table.remove(t, 1))
|
|||
|
|
end
|
|||
|
|
assert(#t == 0)
|
|||
|
|
|
|||
|
|
t = {}
|
|||
|
|
for i,j in string.gmatch("13 14 10 = 11, 15= 16, 22=23", "(%d+)%s*=%s*(%d+)") do
|
|||
|
|
t[tonumber(i)] = tonumber(j)
|
|||
|
|
end
|
|||
|
|
a = 0
|
|||
|
|
for k,v in pairs(t) do assert(k+1 == v+0); a=a+1 end
|
|||
|
|
assert(a == 3)
|
|||
|
|
|
|||
|
|
|
|||
|
|
do -- init parameter in gmatch
|
|||
|
|
local s = 0
|
|||
|
|
for k in string.gmatch("10 20 30", "%d+", 3) do
|
|||
|
|
s = s + tonumber(k)
|
|||
|
|
end
|
|||
|
|
assert(s == 50)
|
|||
|
|
|
|||
|
|
s = 0
|
|||
|
|
for k in string.gmatch("11 21 31", "%d+", -4) do
|
|||
|
|
s = s + tonumber(k)
|
|||
|
|
end
|
|||
|
|
assert(s == 32)
|
|||
|
|
|
|||
|
|
-- there is an empty string at the end of the subject
|
|||
|
|
s = 0
|
|||
|
|
for k in string.gmatch("11 21 31", "%w*", 9) do
|
|||
|
|
s = s + 1
|
|||
|
|
end
|
|||
|
|
assert(s == 1)
|
|||
|
|
|
|||
|
|
-- there are no empty strings after the end of the subject
|
|||
|
|
s = 0
|
|||
|
|
for k in string.gmatch("11 21 31", "%w*", 10) do
|
|||
|
|
s = s + 1
|
|||
|
|
end
|
|||
|
|
assert(s == 0)
|
|||
|
|
end
|
|||
|
|
|
|||
|
|
|
|||
|
|
-- tests for `%f' (`frontiers')
|
|||
|
|
|
|||
|
|
assert(string.gsub("aaa aa a aaa a", "%f[%w]a", "x") == "xaa xa x xaa x")
|
|||
|
|
assert(string.gsub("[[]] [][] [[[[", "%f[[].", "x") == "x[]] x]x] x[[[")
|
|||
|
|
assert(string.gsub("01abc45de3", "%f[%d]", ".") == ".01abc.45de.3")
|
|||
|
|
assert(string.gsub("01abc45 de3x", "%f[%D]%w", ".") == "01.bc45 de3.")
|
|||
|
|
assert(string.gsub("function", "%f[\1-\255]%w", ".") == ".unction")
|
|||
|
|
assert(string.gsub("function", "%f[^\1-\255]", ".") == "function.")
|
|||
|
|
|
|||
|
|
assert(string.find("a", "%f[a]") == 1)
|
|||
|
|
assert(string.find("a", "%f[^%z]") == 1)
|
|||
|
|
assert(string.find("a", "%f[^%l]") == 2)
|
|||
|
|
assert(string.find("aba", "%f[a%z]") == 3)
|
|||
|
|
assert(string.find("aba", "%f[%z]") == 4)
|
|||
|
|
assert(not string.find("aba", "%f[%l%z]"))
|
|||
|
|
assert(not string.find("aba", "%f[^%l%z]"))
|
|||
|
|
|
|||
|
|
local i, e = string.find(" alo aalo allo", "%f[%S].-%f[%s].-%f[%S]")
|
|||
|
|
assert(i == 2 and e == 5)
|
|||
|
|
local k = string.match(" alo aalo allo", "%f[%S](.-%f[%s].-%f[%S])")
|
|||
|
|
assert(k == 'alo ')
|
|||
|
|
|
|||
|
|
local a = {1, 5, 9, 14, 17,}
|
|||
|
|
for k in string.gmatch("alo alo th02 is 1hat", "()%f[%w%d]") do
|
|||
|
|
assert(table.remove(a, 1) == k)
|
|||
|
|
end
|
|||
|
|
assert(#a == 0)
|
|||
|
|
|
|||
|
|
|
|||
|
|
-- malformed patterns
|
|||
|
|
local function malform (p, m)
|
|||
|
|
m = m or "malformed"
|
|||
|
|
local r, msg = pcall(string.find, "a", p)
|
|||
|
|
assert(not r and string.find(msg, m))
|
|||
|
|
end
|
|||
|
|
|
|||
|
|
malform("(.", "unfinished capture")
|
|||
|
|
malform(".)", "invalid pattern capture")
|
|||
|
|
malform("[a")
|
|||
|
|
malform("[]")
|
|||
|
|
malform("[^]")
|
|||
|
|
malform("[a%]")
|
|||
|
|
malform("[a%")
|
|||
|
|
malform("%b")
|
|||
|
|
malform("%ba")
|
|||
|
|
malform("%")
|
|||
|
|
malform("%f", "missing")
|
|||
|
|
|
|||
|
|
-- \0 in patterns
|
|||
|
|
assert(string.match("ab\0\1\2c", "[\0-\2]+") == "\0\1\2")
|
|||
|
|
assert(string.match("ab\0\1\2c", "[\0-\0]+") == "\0")
|
|||
|
|
assert(string.find("b$a", "$\0?") == 2)
|
|||
|
|
assert(string.find("abc\0efg", "%\0") == 4)
|
|||
|
|
assert(string.match("abc\0efg\0\1e\1g", "%b\0\1") == "\0efg\0\1e\1")
|
|||
|
|
assert(string.match("abc\0\0\0", "%\0+") == "\0\0\0")
|
|||
|
|
assert(string.match("abc\0\0\0", "%\0%\0?") == "\0\0")
|
|||
|
|
|
|||
|
|
-- magic char after \0
|
|||
|
|
assert(string.find("abc\0\0","\0.") == 4)
|
|||
|
|
assert(string.find("abcx\0\0abc\0abc","x\0\0abc\0a.") == 4)
|
|||
|
|
|
|||
|
|
|
|||
|
|
do -- test reuse of original string in gsub
|
|||
|
|
local s = string.rep("a", 100)
|
|||
|
|
local r = string.gsub(s, "b", "c") -- no match
|
|||
|
|
assert(string.format("%p", s) == string.format("%p", r))
|
|||
|
|
|
|||
|
|
r = string.gsub(s, ".", {x = "y"}) -- no substitutions
|
|||
|
|
assert(string.format("%p", s) == string.format("%p", r))
|
|||
|
|
|
|||
|
|
local count = 0
|
|||
|
|
r = string.gsub(s, ".", function (x)
|
|||
|
|
assert(x == "a")
|
|||
|
|
count = count + 1
|
|||
|
|
return nil -- no substitution
|
|||
|
|
end)
|
|||
|
|
r = string.gsub(r, ".", {b = 'x'}) -- "a" is not a key; no subst.
|
|||
|
|
assert(count == 100)
|
|||
|
|
assert(string.format("%p", s) == string.format("%p", r))
|
|||
|
|
|
|||
|
|
count = 0
|
|||
|
|
r = string.gsub(s, ".", function (x)
|
|||
|
|
assert(x == "a")
|
|||
|
|
count = count + 1
|
|||
|
|
return x -- substitution...
|
|||
|
|
end)
|
|||
|
|
assert(count == 100)
|
|||
|
|
-- no reuse in this case
|
|||
|
|
assert(r == s and string.format("%p", s) ~= string.format("%p", r))
|
|||
|
|
end
|
|||
|
|
|
|||
|
|
print('OK')
|
|||
|
|
|