-- $Id: pm.lua,v 1.48 2016/11/07 13:11:28 roberto Exp $
-- 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


function f(s, p)
  local i,e = string.find(s, p)
  if i then return string.sub(s, i, e) end
end

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(string.find('a\0a\0a\0a\0\0ab', 'b\0') == nil)   -- check ending
assert(string.find('', '\0') == nil)
assert(string.find('alo123alo', '12') == 4)
assert(string.find('alo123alo', '^12') == nil)

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(f('aaa', 'b+') == nil)
assert(f('aaa', 'ab+a') == nil)
assert(f('aba', 'ab+a') == 'aba')
assert(f('a$a', '.$') == 'a')
assert(f('a$a', '.%$') == 'a$')
assert(f('a$a', '.$.') == 'a$a')
assert(f('a$a', '$$') == nil)
assert(f('a$b', 'a$') == nil)
assert(f('a$a', '$') == '')
assert(f('', 'b*') == '')
assert(f('aaa', 'bb*') == nil)
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 � assim', '%S%S*') == 'isto')
assert(f(' \n isto � assim', '%S*$') == 'assim')
-- assert(f(' \n isto � assim', '[a-z]*$') == 'assim')
-- assert(f('um caracter ? extra', '[^%sa-z]') == '?')
assert(f('', 'a?') == '')
-- assert(f('�', '�?') == '�')
-- assert(f('�bl', '�?b?l?') == '�bl')
assert(f('  �bl', '�?b?l?') == '')
assert(f('aa', '^aa?a?a') == 'aa')
-- assert(f(']]]�b', '[^]]') == '�')
assert(f("0alo alo", "%x*") == "0a")
assert(f("alo alo", "%C+") == "alo alo")
print('+')


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$') == '=======')
-- assert(string.match('==========', '^([=]*)=%1$') == nil)

-- local function range (i, j)
--   if i <= j then
--     return i, range(i+1, j)
--   end
-- end

-- local abc = string.char(range(0, 255));

-- assert(string.len(abc) == 256)

-- 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*)$") == "")
-- assert(string.match("alo ", "(%w+)$") == nil)
-- assert(string.find("(�lo)", "%(�") == 1)
-- local a, b, c, d, e = string.match("�lo alo", "^(((.).).* (%w*))$")
-- assert(a == '�lo alo' and b == '�l' and c == '�' 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('�lo �lo', '�', 'x') == 'xlo xlo')
-- assert(string.gsub('alo �lo  ', ' +$', '') == 'alo �lo')  -- trim
-- assert(string.gsub('  alo alo  ', '^%s*(.-)%s*$', '%1') == 'alo alo')  -- double trim
-- assert(string.gsub('alo  alo  \n 123\n ', '%s+', ' ') == 'alo alo 123 ')
-- t = "ab� d"
-- a, b = string.gsub(t, '(.)', '%1@')
-- assert('@'..a == string.gsub(t, '', '@') and b == 5)
-- a, b = string.gsub('ab�d', '(.)', '%0@', 2)
-- assert(a == 'a@b@�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('���', '$', '\0��') == '���\0��')
-- assert(string.gsub('', '^', 'r') == 'r')
-- assert(string.gsub('', '$', '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")
-- end

-- function f(a,b) return string.gsub(a,'.',b) end
-- assert(string.gsub("trocar tudo em |teste|b| � |beleza|al|", "|([^|]*)|([^|]*)|", f) ==
--             "trocar tudo em bbbbb � alalalalalal")

-- local function dostring (s) return load(s, "")() or "" end
-- assert(string.gsub("alo $a='x'$ novamente $return a$",
--                    "$([^$]*)%$",
--                    dostring) == "alo  novamente x")

-- x = string.gsub("$x=string.gsub('alo', '.', string.upper)$ assim vai para $return x$",
--          "$([^$]*)%$", dostring)
-- assert(x == ' assim vai para ALO')

-- t = {}
-- s = 'a alo jose  joao'
-- 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)


-- function isbalanced (s)
--   return string.find(string.gsub(s, "%b()", ""), "[()]") == nil
-- 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] == nil)

-- 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")

-- -- bug since 2.5 (C-stack overflow)
-- do
--   local function f (size)
--     local s = string.rep("a", size)
--     local p = string.rep(".?", size)
--     return pcall(string.match, s, p)
--   end
--   local r, m = f(80)
--   assert(r and #m == 80)
--   r, m = f(200000)
--   assert(not r and string.find(m, "too complex"))
-- end

-- 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
-- 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)


-- -- 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)

print('OK')

