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test.lua
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test.lua
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#!/usr/bin/env lua
-- $Id: test.lua,v 1.109 2015/09/28 17:01:25 roberto Exp $
-- require"strict" -- just to be pedantic
local m = require"lpeg"
function normal ()
-- for general use
local a, b, c, d, e, f, g, p, t
-- compatibility with Lua 5.2
local unpack = rawget(table, "unpack") or unpack
local loadstring = rawget(_G, "loadstring") or load
local any = m.P(1)
local space = m.S" \t\n"^0
local function checkeq (x, y, p)
if p then print(x,y) end
if type(x) ~= "table" then assert(x == y)
else
for k,v in pairs(x) do checkeq(v, y[k], p) end
for k,v in pairs(y) do checkeq(v, x[k], p) end
end
end
local mt = getmetatable(m.P(1))
local allchar = {}
for i=0,255 do allchar[i + 1] = i end
allchar = string.char(unpack(allchar))
assert(#allchar == 256)
local function cs2str (c)
return m.match(m.Cs((c + m.P(1)/"")^0), allchar)
end
local function eqcharset (c1, c2)
assert(cs2str(c1) == cs2str(c2))
end
print"General tests for LPeg library"
assert(type(m.version()) == "string")
print("version " .. m.version())
assert(m.type("alo") ~= "pattern")
assert(m.type(io.input) ~= "pattern")
assert(m.type(m.P"alo") == "pattern")
-- tests for some basic optimizations
assert(m.match(m.P(false) + "a", "a") == 2)
assert(m.match(m.P(true) + "a", "a") == 1)
assert(m.match("a" + m.P(false), "b") == nil)
assert(m.match("a" + m.P(true), "b") == 1)
assert(m.match(m.P(false) * "a", "a") == nil)
assert(m.match(m.P(true) * "a", "a") == 2)
assert(m.match("a" * m.P(false), "a") == nil)
assert(m.match("a" * m.P(true), "a") == 2)
assert(m.match(#m.P(false) * "a", "a") == nil)
assert(m.match(#m.P(true) * "a", "a") == 2)
assert(m.match("a" * #m.P(false), "a") == nil)
assert(m.match("a" * #m.P(true), "a") == 2)
-- tests for locale
do
assert(m.locale(m) == m)
local t = {}
assert(m.locale(t, m) == t)
local x = m.locale()
for n,v in pairs(x) do
assert(type(n) == "string")
eqcharset(v, m[n])
end
end
assert(m.match(3, "aaaa"))
assert(m.match(4, "aaaa"))
assert(not m.match(5, "aaaa"))
assert(m.match(-3, "aa"))
assert(not m.match(-3, "aaa"))
assert(not m.match(-3, "aaaa"))
assert(not m.match(-4, "aaaa"))
assert(m.P(-5):match"aaaa")
assert(m.match("a", "alo") == 2)
assert(m.match("al", "alo") == 3)
assert(not m.match("alu", "alo"))
assert(m.match(true, "") == 1)
local digit = m.S"0123456789"
local upper = m.S"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
local lower = m.S"abcdefghijklmnopqrstuvwxyz"
local letter = m.S"" + upper + lower
local alpha = letter + digit + m.R()
eqcharset(m.S"", m.P(false))
eqcharset(upper, m.R("AZ"))
eqcharset(lower, m.R("az"))
eqcharset(upper + lower, m.R("AZ", "az"))
eqcharset(upper + lower, m.R("AZ", "cz", "aa", "bb", "90"))
eqcharset(digit, m.S"01234567" + "8" + "9")
eqcharset(upper, letter - lower)
eqcharset(m.S(""), m.R())
assert(cs2str(m.S("")) == "")
eqcharset(m.S"\0", "\0")
eqcharset(m.S"\1\0\2", m.R"\0\2")
eqcharset(m.S"\1\0\2", m.R"\1\2" + "\0")
eqcharset(m.S"\1\0\2" - "\0", m.R"\1\2")
local word = alpha^1 * (1 - alpha)^0
assert((word^0 * -1):match"alo alo")
assert(m.match(word^1 * -1, "alo alo"))
assert(m.match(word^2 * -1, "alo alo"))
assert(not m.match(word^3 * -1, "alo alo"))
assert(not m.match(word^-1 * -1, "alo alo"))
assert(m.match(word^-2 * -1, "alo alo"))
assert(m.match(word^-3 * -1, "alo alo"))
local eos = m.P(-1)
assert(m.match(digit^0 * letter * digit * eos, "1298a1"))
assert(not m.match(digit^0 * letter * eos, "1257a1"))
b = {
[1] = "(" * (((1 - m.S"()") + #m.P"(" * m.V(1))^0) * ")"
}
assert(m.match(b, "(al())()"))
assert(not m.match(b * eos, "(al())()"))
assert(m.match(b * eos, "((al())()(é))"))
assert(not m.match(b, "(al()()"))
assert(not m.match(letter^1 - "for", "foreach"))
assert(m.match(letter^1 - ("for" * eos), "foreach"))
assert(not m.match(letter^1 - ("for" * eos), "for"))
function basiclookfor (p)
return m.P {
[1] = p + (1 * m.V(1))
}
end
function caplookfor (p)
return basiclookfor(p:C())
end
assert(m.match(caplookfor(letter^1), " 4achou123...") == "achou")
a = {m.match(caplookfor(letter^1)^0, " two words, one more ")}
checkeq(a, {"two", "words", "one", "more"})
assert(m.match( basiclookfor((#m.P(b) * 1) * m.Cp()), " ( (a)") == 7)
a = {m.match(m.C(digit^1 * m.Cc"d") + m.C(letter^1 * m.Cc"l"), "123")}
checkeq(a, {"123", "d"})
-- bug in LPeg 0.12 (nil value does not create a 'ktable')
assert(m.match(m.Cc(nil), "") == nil)
a = {m.match(m.C(digit^1 * m.Cc"d") + m.C(letter^1 * m.Cc"l"), "abcd")}
checkeq(a, {"abcd", "l"})
a = {m.match(m.Cc(10,20,30) * 'a' * m.Cp(), 'aaa')}
checkeq(a, {10,20,30,2})
a = {m.match(m.Cp() * m.Cc(10,20,30) * 'a' * m.Cp(), 'aaa')}
checkeq(a, {1,10,20,30,2})
a = m.match(m.Ct(m.Cp() * m.Cc(10,20,30) * 'a' * m.Cp()), 'aaa')
checkeq(a, {1,10,20,30,2})
a = m.match(m.Ct(m.Cp() * m.Cc(7,8) * m.Cc(10,20,30) * 'a' * m.Cp()), 'aaa')
checkeq(a, {1,7,8,10,20,30,2})
a = {m.match(m.Cc() * m.Cc() * m.Cc(1) * m.Cc(2,3,4) * m.Cc() * 'a', 'aaa')}
checkeq(a, {1,2,3,4})
a = {m.match(m.Cp() * letter^1 * m.Cp(), "abcd")}
checkeq(a, {1, 5})
t = {m.match({[1] = m.C(m.C(1) * m.V(1) + -1)}, "abc")}
checkeq(t, {"abc", "a", "bc", "b", "c", "c", ""})
-- bug in 0.12 ('hascapture' did not check for captures inside a rule)
do
local pat = m.P{
'S';
S1 = m.C('abc') + 3,
S = #m.V('S1') -- rule has capture, but '#' must ignore it
}
assert(pat:match'abc' == 1)
end
-- test for small capture boundary
for i = 250,260 do
assert(#m.match(m.C(i), string.rep('a', i)) == i)
assert(#m.match(m.C(m.C(i)), string.rep('a', i)) == i)
end
-- tests for any*n and any*-n
for n = 1, 550, 13 do
local x_1 = string.rep('x', n - 1)
local x = x_1 .. 'a'
assert(not m.P(n):match(x_1))
assert(m.P(n):match(x) == n + 1)
assert(n < 4 or m.match(m.P(n) + "xxx", x_1) == 4)
assert(m.C(n):match(x) == x)
assert(m.C(m.C(n)):match(x) == x)
assert(m.P(-n):match(x_1) == 1)
assert(not m.P(-n):match(x))
assert(n < 13 or m.match(m.Cc(20) * ((n - 13) * m.P(10)) * 3, x) == 20)
local n3 = math.floor(n/3)
assert(m.match(n3 * m.Cp() * n3 * n3, x) == n3 + 1)
end
-- true values
assert(m.P(0):match("x") == 1)
assert(m.P(0):match("") == 1)
assert(m.C(0):match("x") == "")
assert(m.match(m.Cc(0) * m.P(10) + m.Cc(1) * "xuxu", "xuxu") == 1)
assert(m.match(m.Cc(0) * m.P(10) + m.Cc(1) * "xuxu", "xuxuxuxuxu") == 0)
assert(m.match(m.C(m.P(2)^1), "abcde") == "abcd")
p = m.Cc(0) * 1 + m.Cc(1) * 2 + m.Cc(2) * 3 + m.Cc(3) * 4
-- test for alternation optimization
assert(m.match(m.P"a"^1 + "ab" + m.P"x"^0, "ab") == 2)
assert(m.match((m.P"a"^1 + "ab" + m.P"x"^0 * 1)^0, "ab") == 3)
assert(m.match(m.P"ab" + "cd" + "" + "cy" + "ak", "98") == 1)
assert(m.match(m.P"ab" + "cd" + "ax" + "cy", "ax") == 3)
assert(m.match("a" * m.P"b"^0 * "c" + "cd" + "ax" + "cy", "ax") == 3)
assert(m.match((m.P"ab" + "cd" + "ax" + "cy")^0, "ax") == 3)
assert(m.match(m.P(1) * "x" + m.S"" * "xu" + "ay", "ay") == 3)
assert(m.match(m.P"abc" + "cde" + "aka", "aka") == 4)
assert(m.match(m.S"abc" * "x" + "cde" + "aka", "ax") == 3)
assert(m.match(m.S"abc" * "x" + "cde" + "aka", "aka") == 4)
assert(m.match(m.S"abc" * "x" + "cde" + "aka", "cde") == 4)
assert(m.match(m.S"abc" * "x" + "ide" + m.S"ab" * "ka", "aka") == 4)
assert(m.match("ab" + m.S"abc" * m.P"y"^0 * "x" + "cde" + "aka", "ax") == 3)
assert(m.match("ab" + m.S"abc" * m.P"y"^0 * "x" + "cde" + "aka", "aka") == 4)
assert(m.match("ab" + m.S"abc" * m.P"y"^0 * "x" + "cde" + "aka", "cde") == 4)
assert(m.match("ab" + m.S"abc" * m.P"y"^0 * "x" + "ide" + m.S"ab" * "ka", "aka") == 4)
assert(m.match("ab" + m.S"abc" * m.P"y"^0 * "x" + "ide" + m.S"ab" * "ka", "ax") == 3)
assert(m.match(m.P(1) * "x" + "cde" + m.S"ab" * "ka", "aka") == 4)
assert(m.match(m.P(1) * "x" + "cde" + m.P(1) * "ka", "aka") == 4)
assert(m.match(m.P(1) * "x" + "cde" + m.P(1) * "ka", "cde") == 4)
assert(m.match(m.P"eb" + "cd" + m.P"e"^0 + "x", "ee") == 3)
assert(m.match(m.P"ab" + "cd" + m.P"e"^0 + "x", "abcd") == 3)
assert(m.match(m.P"ab" + "cd" + m.P"e"^0 + "x", "eeex") == 4)
assert(m.match(m.P"ab" + "cd" + m.P"e"^0 + "x", "cd") == 3)
assert(m.match(m.P"ab" + "cd" + m.P"e"^0 + "x", "x") == 1)
assert(m.match(m.P"ab" + "cd" + m.P"e"^0 + "x" + "", "zee") == 1)
assert(m.match(m.P"ab" + "cd" + m.P"e"^1 + "x", "abcd") == 3)
assert(m.match(m.P"ab" + "cd" + m.P"e"^1 + "x", "eeex") == 4)
assert(m.match(m.P"ab" + "cd" + m.P"e"^1 + "x", "cd") == 3)
assert(m.match(m.P"ab" + "cd" + m.P"e"^1 + "x", "x") == 2)
assert(m.match(m.P"ab" + "cd" + m.P"e"^1 + "x" + "", "zee") == 1)
assert(not m.match(("aa" * m.P"bc"^-1 + "aab") * "e", "aabe"))
assert(m.match("alo" * (m.P"\n" + -1), "alo") == 4)
-- bug in 0.12 (rc1)
assert(m.match((m.P"\128\187\191" + m.S"abc")^0, "\128\187\191") == 4)
assert(m.match(m.S"\0\128\255\127"^0, string.rep("\0\128\255\127", 10)) ==
4*10 + 1)
-- optimizations with optional parts
assert(m.match(("ab" * -m.P"c")^-1, "abc") == 1)
assert(m.match(("ab" * #m.P"c")^-1, "abd") == 1)
assert(m.match(("ab" * m.B"c")^-1, "ab") == 1)
assert(m.match(("ab" * m.P"cd"^0)^-1, "abcdcdc") == 7)
assert(m.match(m.P"ab"^-1 - "c", "abcd") == 3)
p = ('Aa' * ('Bb' * ('Cc' * m.P'Dd'^0)^0)^0)^-1
assert(p:match("AaBbCcDdBbCcDdDdDdBb") == 21)
-- bug in 0.12.2
-- p = { ('ab' ('c' 'ef'?)*)? }
p = m.C(('ab' * ('c' * m.P'ef'^-1)^0)^-1)
s = "abcefccefc"
assert(s == p:match(s))
pi = "3.14159 26535 89793 23846 26433 83279 50288 41971 69399 37510"
assert(m.match(m.Cs((m.P"1" / "a" + m.P"5" / "b" + m.P"9" / "c" + 1)^0), pi) ==
m.match(m.Cs((m.P(1) / {["1"] = "a", ["5"] = "b", ["9"] = "c"})^0), pi))
print"+"
-- tests for capture optimizations
assert(m.match((m.P(3) + 4 * m.Cp()) * "a", "abca") == 5)
t = {m.match(((m.P"a" + m.Cp()) * m.P"x")^0, "axxaxx")}
checkeq(t, {3, 6})
-- tests for numbered captures
p = m.C(1)
assert(m.match(m.C(m.C(p * m.C(2)) * m.C(3)) / 3, "abcdefgh") == "a")
assert(m.match(m.C(m.C(p * m.C(2)) * m.C(3)) / 1, "abcdefgh") == "abcdef")
assert(m.match(m.C(m.C(p * m.C(2)) * m.C(3)) / 4, "abcdefgh") == "bc")
assert(m.match(m.C(m.C(p * m.C(2)) * m.C(3)) / 0, "abcdefgh") == 7)
a, b, c = m.match(p * (m.C(p * m.C(2)) * m.C(3) / 4) * p, "abcdefgh")
assert(a == "a" and b == "efg" and c == "h")
-- test for table captures
t = m.match(m.Ct(letter^1), "alo")
checkeq(t, {})
t, n = m.match(m.Ct(m.C(letter)^1) * m.Cc"t", "alo")
assert(n == "t" and table.concat(t) == "alo")
t = m.match(m.Ct(m.C(m.C(letter)^1)), "alo")
assert(table.concat(t, ";") == "alo;a;l;o")
t = m.match(m.Ct(m.C(m.C(letter)^1)), "alo")
assert(table.concat(t, ";") == "alo;a;l;o")
t = m.match(m.Ct(m.Ct((m.Cp() * letter * m.Cp())^1)), "alo")
assert(table.concat(t[1], ";") == "1;2;2;3;3;4")
t = m.match(m.Ct(m.C(m.C(1) * 1 * m.C(1))), "alo")
checkeq(t, {"alo", "a", "o"})
-- tests for groups
p = m.Cg(1) -- no capture
assert(p:match('x') == 'x')
p = m.Cg(m.P(true)/function () end * 1) -- no value
assert(p:match('x') == 'x')
p = m.Cg(m.Cg(m.Cg(m.C(1))))
assert(p:match('x') == 'x')
p = m.Cg(m.Cg(m.Cg(m.C(1))^0) * m.Cg(m.Cc(1) * m.Cc(2)))
t = {p:match'abc'}
checkeq(t, {'a', 'b', 'c', 1, 2})
p = m.Ct(m.Cg(m.Cc(10), "hi") * m.C(1)^0 * m.Cg(m.Cc(20), "ho"))
t = p:match''
checkeq(t, {hi = 10, ho = 20})
t = p:match'abc'
checkeq(t, {hi = 10, ho = 20, 'a', 'b', 'c'})
-- non-string group names
p = m.Ct(m.Cg(1, print) * m.Cg(1, 23.5) * m.Cg(1, io))
t = p:match('abcdefghij')
assert(t[print] == 'a' and t[23.5] == 'b' and t[io] == 'c')
-- test for error messages
local function checkerr (msg, f, ...)
local st, err = pcall(f, ...)
assert(not st and m.match({ m.P(msg) + 1 * m.V(1) }, err))
end
checkerr("rule '1' may be left recursive", m.match, { m.V(1) * 'a' }, "a")
checkerr("rule '1' used outside a grammar", m.match, m.V(1), "")
checkerr("rule 'hiii' used outside a grammar", m.match, m.V('hiii'), "")
checkerr("rule 'hiii' undefined in given grammar", m.match, { m.V('hiii') }, "")
checkerr("undefined in given grammar", m.match, { m.V{} }, "")
checkerr("rule 'A' is not a pattern", m.P, { m.P(1), A = {} })
checkerr("grammar has no initial rule", m.P, { [print] = {} })
-- grammar with a long call chain before left recursion
p = {'a',
a = m.V'b' * m.V'c' * m.V'd' * m.V'a',
b = m.V'c',
c = m.V'd',
d = m.V'e',
e = m.V'f',
f = m.V'g',
g = m.P''
}
checkerr("rule 'a' may be left recursive", m.match, p, "a")
-- Bug in peephole optimization of LPeg 0.12 (IJmp -> ICommit)
-- the next grammar has an original sequence IJmp -> ICommit -> IJmp L1
-- that is optimized to ICommit L1
p = m.P { (m.P {m.P'abc'} + 'ayz') * m.V'y'; y = m.P'x' }
assert(p:match('abcx') == 5 and p:match('ayzx') == 5 and not p:match'abc')
do
-- large dynamic Cc
local lim = 2^16 - 1
local c = 0
local function seq (n)
if n == 1 then c = c + 1; return m.Cc(c)
else
local m = math.floor(n / 2)
return seq(m) * seq(n - m)
end
end
p = m.Ct(seq(lim))
t = p:match('')
assert(t[lim] == lim)
checkerr("too many", function () p = p / print end)
checkerr("too many", seq, lim + 1)
end
-- tests for non-pattern as arguments to pattern functions
p = { ('a' * m.V(1))^-1 } * m.P'b' * { 'a' * m.V(2); m.V(1)^-1 }
assert(m.match(p, "aaabaac") == 7)
p = m.P'abc' * 2 * -5 * true * 'de' -- mix of numbers and strings and booleans
assert(p:match("abc01de") == 8)
assert(p:match("abc01de3456") == nil)
p = 'abc' * (2 * (-5 * (true * m.P'de')))
assert(p:match("abc01de") == 8)
assert(p:match("abc01de3456") == nil)
p = { m.V(2), m.P"abc" } *
(m.P{ "xx", xx = m.P"xx" } + { "x", x = m.P"a" * m.V"x" + "" })
assert(p:match("abcaaaxx") == 7)
assert(p:match("abcxx") == 6)
-- a large table capture
t = m.match(m.Ct(m.C('a')^0), string.rep("a", 10000))
assert(#t == 10000 and t[1] == 'a' and t[#t] == 'a')
print('+')
-- bug in 0.10 (rechecking a grammar, after tail-call optimization)
m.P{ m.P { (m.P(3) + "xuxu")^0 * m.V"xuxu", xuxu = m.P(1) } }
local V = m.V
local Space = m.S(" \n\t")^0
local Number = m.C(m.R("09")^1) * Space
local FactorOp = m.C(m.S("+-")) * Space
local TermOp = m.C(m.S("*/")) * Space
local Open = "(" * Space
local Close = ")" * Space
local function f_factor (v1, op, v2, d)
assert(d == nil)
if op == "+" then return v1 + v2
else return v1 - v2
end
end
local function f_term (v1, op, v2, d)
assert(d == nil)
if op == "*" then return v1 * v2
else return v1 / v2
end
end
G = m.P{ "Exp",
Exp = m.Cf(V"Factor" * m.Cg(FactorOp * V"Factor")^0, f_factor);
Factor = m.Cf(V"Term" * m.Cg(TermOp * V"Term")^0, f_term);
Term = Number / tonumber + Open * V"Exp" * Close;
}
G = Space * G * -1
for _, s in ipairs{" 3 + 5*9 / (1+1) ", "3+4/2", "3+3-3- 9*2+3*9/1- 8"} do
assert(m.match(G, s) == loadstring("return "..s)())
end
-- test for grammars (errors deep in calling non-terminals)
g = m.P{
[1] = m.V(2) + "a",
[2] = "a" * m.V(3) * "x",
[3] = "b" * m.V(3) + "c"
}
assert(m.match(g, "abbbcx") == 7)
assert(m.match(g, "abbbbx") == 2)
-- tests for \0
assert(m.match(m.R("\0\1")^1, "\0\1\0") == 4)
assert(m.match(m.S("\0\1ab")^1, "\0\1\0a") == 5)
assert(m.match(m.P(1)^3, "\0\1\0a") == 5)
assert(not m.match(-4, "\0\1\0a"))
assert(m.match("\0\1\0a", "\0\1\0a") == 5)
assert(m.match("\0\0\0", "\0\0\0") == 4)
assert(not m.match("\0\0\0", "\0\0"))
-- tests for predicates
assert(not m.match(-m.P("a") * 2, "alo"))
assert(m.match(- -m.P("a") * 2, "alo") == 3)
assert(m.match(#m.P("a") * 2, "alo") == 3)
assert(m.match(##m.P("a") * 2, "alo") == 3)
assert(not m.match(##m.P("c") * 2, "alo"))
assert(m.match(m.Cs((##m.P("a") * 1 + m.P(1)/".")^0), "aloal") == "a..a.")
assert(m.match(m.Cs((#((#m.P"a")/"") * 1 + m.P(1)/".")^0), "aloal") == "a..a.")
assert(m.match(m.Cs((- -m.P("a") * 1 + m.P(1)/".")^0), "aloal") == "a..a.")
assert(m.match(m.Cs((-((-m.P"a")/"") * 1 + m.P(1)/".")^0), "aloal") == "a..a.")
p = -m.P'a' * m.Cc(1) + -m.P'b' * m.Cc(2) + -m.P'c' * m.Cc(3)
assert(p:match('a') == 2 and p:match('') == 1 and p:match('b') == 1)
p = -m.P'a' * m.Cc(10) + #m.P'a' * m.Cc(20)
assert(p:match('a') == 20 and p:match('') == 10 and p:match('b') == 10)
-- look-behind predicate
assert(not m.match(m.B'a', 'a'))
assert(m.match(1 * m.B'a', 'a') == 2)
assert(not m.match(m.B(1), 'a'))
assert(m.match(1 * m.B(1), 'a') == 2)
assert(m.match(-m.B(1), 'a') == 1)
assert(m.match(m.B(250), string.rep('a', 250)) == nil)
assert(m.match(250 * m.B(250), string.rep('a', 250)) == 251)
-- look-behind with an open call
checkerr("pattern may not have fixed length", m.B, m.V'S1')
checkerr("too long to look behind", m.B, 260)
B = #letter * -m.B(letter) + -letter * m.B(letter)
x = m.Ct({ (B * m.Cp())^-1 * (1 * m.V(1) + m.P(true)) })
checkeq(m.match(x, 'ar cal c'), {1,3,4,7,9,10})
checkeq(m.match(x, ' ar cal '), {2,4,5,8})
checkeq(m.match(x, ' '), {})
checkeq(m.match(x, 'aloalo'), {1,7})
assert(m.match(B, "a") == 1)
assert(m.match(1 * B, "a") == 2)
assert(not m.B(1 - letter):match(""))
assert((-m.B(letter)):match("") == 1)
assert((4 * m.B(letter, 4)):match("aaaaaaaa") == 5)
assert(not (4 * m.B(#letter * 5)):match("aaaaaaaa"))
assert((4 * -m.B(#letter * 5)):match("aaaaaaaa") == 5)
-- look-behind with grammars
assert(m.match('a' * m.B{'x', x = m.P(3)}, 'aaa') == nil)
assert(m.match('aa' * m.B{'x', x = m.P('aaa')}, 'aaaa') == nil)
assert(m.match('aaa' * m.B{'x', x = m.P('aaa')}, 'aaaaa') == 4)
-- bug in 0.9
assert(m.match(('a' * #m.P'b'), "ab") == 2)
assert(not m.match(('a' * #m.P'b'), "a"))
assert(not m.match(#m.S'567', ""))
assert(m.match(#m.S'567' * 1, "6") == 2)
-- tests for Tail Calls
p = m.P{ 'a' * m.V(1) + '' }
assert(p:match(string.rep('a', 1000)) == 1001)
-- create a grammar for a simple DFA for even number of 0s and 1s
--
-- ->1 <---0---> 2
-- ^ ^
-- | |
-- 1 1
-- | |
-- V V
-- 3 <---0---> 4
--
-- this grammar should keep no backtracking information
p = m.P{
[1] = '0' * m.V(2) + '1' * m.V(3) + -1,
[2] = '0' * m.V(1) + '1' * m.V(4),
[3] = '0' * m.V(4) + '1' * m.V(1),
[4] = '0' * m.V(3) + '1' * m.V(2),
}
assert(p:match(string.rep("00", 10000)))
assert(p:match(string.rep("01", 10000)))
assert(p:match(string.rep("011", 10000)))
assert(not p:match(string.rep("011", 10000) .. "1"))
assert(not p:match(string.rep("011", 10001)))
-- this grammar does need backtracking info.
local lim = 10000
p = m.P{ '0' * m.V(1) + '0' }
if not lpeg_optimize then
checkerr("stack overflow", m.match, p, string.rep("0", lim))
m.setmaxstack(2*lim)
checkerr("stack overflow", m.match, p, string.rep("0", lim))
m.setmaxstack(2*lim + 4)
assert(m.match(p, string.rep("0", lim)) == lim + 1)
else
print "Skipping overflow tests"
end
-- this repetition should not need stack space (only the call does)
p = m.P{ ('a' * m.V(1))^0 * 'b' + 'c' }
m.setmaxstack(200)
assert(p:match(string.rep('a', 180) .. 'c' .. string.rep('b', 180)) == 362)
m.setmaxstack(100) -- restore low limit
-- tests for optional start position
assert(m.match("a", "abc", 1))
assert(m.match("b", "abc", 2))
assert(m.match("c", "abc", 3))
assert(not m.match(1, "abc", 4))
assert(m.match("a", "abc", -3))
assert(m.match("b", "abc", -2))
assert(m.match("c", "abc", -1))
assert(m.match("abc", "abc", -4)) -- truncate to position 1
assert(m.match("", "abc", 10)) -- empty string is everywhere!
assert(m.match("", "", 10))
assert(not m.match(1, "", 1))
assert(not m.match(1, "", -1))
assert(not m.match(1, "", 0))
print("+")
-- tests for argument captures
checkerr("invalid argument", m.Carg, 0)
checkerr("invalid argument", m.Carg, -1)
checkerr("invalid argument", m.Carg, 2^18)
checkerr("absent extra argument #1", m.match, m.Carg(1), 'a', 1)
assert(m.match(m.Carg(1), 'a', 1, print) == print)
x = {m.match(m.Carg(1) * m.Carg(2), '', 1, 10, 20)}
checkeq(x, {10, 20})
assert(m.match(m.Cmt(m.Cg(m.Carg(3), "a") *
m.Cmt(m.Cb("a"), function (s,i,x)
assert(s == "a" and i == 1);
return i, x+1
end) *
m.Carg(2), function (s,i,a,b,c)
assert(s == "a" and i == 1 and c == nil);
return i, 2*a + 3*b
end) * "a",
"a", 1, false, 100, 1000) == 2*1001 + 3*100)
-- tests for Lua functions
t = {}
s = ""
p = m.P(function (s1, i) assert(s == s1); t[#t + 1] = i; return nil end) * false
s = "hi, this is a test"
assert(m.match(((p - m.P(-1)) + 2)^0, s) == string.len(s) + 1)
assert(#t == string.len(s)/2 and t[1] == 1 and t[2] == 3)
assert(not m.match(p, s))
p = mt.__add(function (s, i) return i end, function (s, i) return nil end)
assert(m.match(p, "alo"))
p = mt.__mul(function (s, i) return i end, function (s, i) return nil end)
assert(not m.match(p, "alo"))
t = {}
p = function (s1, i) assert(s == s1); t[#t + 1] = i; return i end
s = "hi, this is a test"
assert(m.match((m.P(1) * p)^0, s) == string.len(s) + 1)
assert(#t == string.len(s) and t[1] == 2 and t[2] == 3)
t = {}
p = m.P(function (s1, i) assert(s == s1); t[#t + 1] = i;
return i <= s1:len() and i end) * 1
s = "hi, this is a test"
assert(m.match(p^0, s) == string.len(s) + 1)
assert(#t == string.len(s) + 1 and t[1] == 1 and t[2] == 2)
p = function (s1, i) return m.match(m.P"a"^1, s1, i) end
assert(m.match(p, "aaaa") == 5)
assert(m.match(p, "abaa") == 2)
assert(not m.match(p, "baaa"))
checkerr("invalid position", m.match, function () return 2^20 end, s)
checkerr("invalid position", m.match, function () return 0 end, s)
checkerr("invalid position", m.match, function (s, i) return i - 1 end, s)
checkerr("invalid position", m.match,
m.P(1)^0 * function (_, i) return i - 1 end, s)
assert(m.match(m.P(1)^0 * function (_, i) return i end * -1, s))
checkerr("invalid position", m.match,
m.P(1)^0 * function (_, i) return i + 1 end, s)
assert(m.match(m.P(function (s, i) return s:len() + 1 end) * -1, s))
checkerr("invalid position", m.match, m.P(function (s, i) return s:len() + 2 end) * -1, s)
assert(not m.match(m.P(function (s, i) return s:len() end) * -1, s))
assert(m.match(m.P(1)^0 * function (_, i) return true end, s) ==
string.len(s) + 1)
for i = 1, string.len(s) + 1 do
assert(m.match(function (_, _) return i end, s) == i)
end
p = (m.P(function (s, i) return i%2 == 0 and i end) * 1
+ m.P(function (s, i) return i%2 ~= 0 and i + 2 <= s:len() and i end) * 3)^0
* -1
assert(p:match(string.rep('a', 14000)))
-- tests for Function Replacements
f = function (a, ...) if a ~= "x" then return {a, ...} end end
t = m.match(m.C(1)^0/f, "abc")
checkeq(t, {"a", "b", "c"})
t = m.match(m.C(1)^0/f/f, "abc")
checkeq(t, {{"a", "b", "c"}})
t = m.match(m.P(1)^0/f/f, "abc") -- no capture
checkeq(t, {{"abc"}})
t = m.match((m.P(1)^0/f * m.Cp())/f, "abc")
checkeq(t, {{"abc"}, 4})
t = m.match((m.C(1)^0/f * m.Cp())/f, "abc")
checkeq(t, {{"a", "b", "c"}, 4})
t = m.match((m.C(1)^0/f * m.Cp())/f, "xbc")
checkeq(t, {4})
t = m.match(m.C(m.C(1)^0)/f, "abc")
checkeq(t, {"abc", "a", "b", "c"})
g = function (...) return 1, ... end
t = {m.match(m.C(1)^0/g/g, "abc")}
checkeq(t, {1, 1, "a", "b", "c"})
t = {m.match(m.Cc(nil,nil,4) * m.Cc(nil,3) * m.Cc(nil, nil) / g / g, "")}
t1 = {1,1,nil,nil,4,nil,3,nil,nil}
for i=1,10 do assert(t[i] == t1[i]) end
-- bug in 0.12.2: ktable with only nil could be eliminated when joining
-- with a pattern without ktable
assert((m.P"aaa" * m.Cc(nil)):match"aaa" == nil)
t = {m.match((m.C(1) / function (x) return x, x.."x" end)^0, "abc")}
checkeq(t, {"a", "ax", "b", "bx", "c", "cx"})
t = m.match(m.Ct((m.C(1) / function (x,y) return y, x end * m.Cc(1))^0), "abc")
checkeq(t, {nil, "a", 1, nil, "b", 1, nil, "c", 1})
-- tests for Query Replacements
assert(m.match(m.C(m.C(1)^0)/{abc = 10}, "abc") == 10)
assert(m.match(m.C(1)^0/{a = 10}, "abc") == 10)
assert(m.match(m.S("ba")^0/{ab = 40}, "abc") == 40)
t = m.match(m.Ct((m.S("ba")/{a = 40})^0), "abc")
checkeq(t, {40})
assert(m.match(m.Cs((m.C(1)/{a=".", d=".."})^0), "abcdde") == ".bc....e")
assert(m.match(m.Cs((m.C(1)/{f="."})^0), "abcdde") == "abcdde")
assert(m.match(m.Cs((m.C(1)/{d="."})^0), "abcdde") == "abc..e")
assert(m.match(m.Cs((m.C(1)/{e="."})^0), "abcdde") == "abcdd.")
assert(m.match(m.Cs((m.C(1)/{e=".", f="+"})^0), "eefef") == "..+.+")
assert(m.match(m.Cs((m.C(1))^0), "abcdde") == "abcdde")
assert(m.match(m.Cs(m.C(m.C(1)^0)), "abcdde") == "abcdde")
assert(m.match(1 * m.Cs(m.P(1)^0), "abcdde") == "bcdde")
assert(m.match(m.Cs((m.C('0')/'x' + 1)^0), "abcdde") == "abcdde")
assert(m.match(m.Cs((m.C('0')/'x' + 1)^0), "0ab0b0") == "xabxbx")
assert(m.match(m.Cs((m.C('0')/'x' + m.P(1)/{b=3})^0), "b0a0b") == "3xax3")
assert(m.match(m.P(1)/'%0%0'/{aa = -3} * 'x', 'ax') == -3)
assert(m.match(m.C(1)/'%0%1'/{aa = 'z'}/{z = -3} * 'x', 'ax') == -3)
assert(m.match(m.Cs(m.Cc(0) * (m.P(1)/"")), "4321") == "0")
assert(m.match(m.Cs((m.P(1) / "%0")^0), "abcd") == "abcd")
assert(m.match(m.Cs((m.P(1) / "%0.%0")^0), "abcd") == "a.ab.bc.cd.d")
assert(m.match(m.Cs((m.P("a") / "%0.%0" + 1)^0), "abcad") == "a.abca.ad")
assert(m.match(m.C("a") / "%1%%%0", "a") == "a%a")
assert(m.match(m.Cs((m.P(1) / ".xx")^0), "abcd") == ".xx.xx.xx.xx")
assert(m.match(m.Cp() * m.P(3) * m.Cp()/"%2%1%1 - %0 ", "abcde") ==
"411 - abc ")
assert(m.match(m.P(1)/"%0", "abc") == "a")
checkerr("invalid capture index", m.match, m.P(1)/"%1", "abc")
checkerr("invalid capture index", m.match, m.P(1)/"%9", "abc")
p = m.C(1)
p = p * p; p = p * p; p = p * p * m.C(1) / "%9 - %1"
assert(p:match("1234567890") == "9 - 1")
assert(m.match(m.Cc(print), "") == print)
-- too many captures (just ignore extra ones)
p = m.C(1)^0 / "%2-%9-%0-%9"
assert(p:match"01234567890123456789" == "1-8-01234567890123456789-8")
s = string.rep("12345678901234567890", 20)
assert(m.match(m.C(1)^0 / "%9-%1-%0-%3", s) == "9-1-" .. s .. "-3")
-- string captures with non-string subcaptures
p = m.Cc('alo') * m.C(1) / "%1 - %2 - %1"
assert(p:match'x' == 'alo - x - alo')
checkerr("invalid capture value (a boolean)", m.match, m.Cc(true) / "%1", "a")
-- long strings for string capture
l = 10000
s = string.rep('a', l) .. string.rep('b', l) .. string.rep('c', l)
p = (m.C(m.P'a'^1) * m.C(m.P'b'^1) * m.C(m.P'c'^1)) / '%3%2%1'
assert(p:match(s) == string.rep('c', l) ..
string.rep('b', l) ..
string.rep('a', l))
print"+"
-- accumulator capture
function f (x) return x + 1 end
assert(m.match(m.Cf(m.Cc(0) * m.C(1)^0, f), "alo alo") == 7)
t = {m.match(m.Cf(m.Cc(1,2,3), error), "")}
checkeq(t, {1})
p = m.Cf(m.Ct(true) * m.Cg(m.C(m.R"az"^1) * "=" * m.C(m.R"az"^1) * ";")^0,
rawset)
t = p:match("a=b;c=du;xux=yuy;")
checkeq(t, {a="b", c="du", xux="yuy"})
-- errors in accumulator capture
-- no initial capture
checkerr("no initial value", m.match, m.Cf(m.P(5), print), 'aaaaaa')
-- no initial capture (very long match forces fold to be a pair open-close)
checkerr("no initial value", m.match, m.Cf(m.P(500), print),
string.rep('a', 600))
-- nested capture produces no initial value
checkerr("no initial value", m.match, m.Cf(m.P(1) / {}, print), "alo")
-- tests for loop checker
local function isnullable (p)
checkerr("may accept empty string", function (p) return p^0 end, m.P(p))
end
isnullable(m.P("x")^-4)
assert(m.match(((m.P(0) + 1) * m.S"al")^0, "alo") == 3)
assert(m.match((("x" + #m.P(1))^-4 * m.S"al")^0, "alo") == 3)
isnullable("")
isnullable(m.P("x")^0)
isnullable(m.P("x")^-1)
isnullable(m.P("x") + 1 + 2 + m.P("a")^-1)
isnullable(-m.P("ab"))
isnullable(- -m.P("ab"))
isnullable(# #(m.P("ab") + "xy"))
isnullable(- #m.P("ab")^0)
isnullable(# -m.P("ab")^1)
isnullable(#m.V(3))
isnullable(m.V(3) + m.V(1) + m.P('a')^-1)
isnullable({[1] = m.V(2) * m.V(3), [2] = m.V(3), [3] = m.P(0)})
assert(m.match(m.P{[1] = m.V(2) * m.V(3), [2] = m.V(3), [3] = m.P(1)}^0, "abc")
== 3)
assert(m.match(m.P""^-3, "a") == 1)
local function find (p, s)
return m.match(basiclookfor(p), s)
end
local function badgrammar (g, expected)
local stat, msg = pcall(m.P, g)
assert(not stat)
if expected then assert(find(expected, msg)) end
end
badgrammar({[1] = m.V(1)}, "rule '1'")
badgrammar({[1] = m.V(2)}, "rule '2'") -- invalid non-terminal
badgrammar({[1] = m.V"x"}, "rule 'x'") -- invalid non-terminal
badgrammar({[1] = m.V{}}, "rule '(a table)'") -- invalid non-terminal
badgrammar({[1] = #m.P("a") * m.V(1)}, "rule '1'") -- left-recursive
badgrammar({[1] = -m.P("a") * m.V(1)}, "rule '1'") -- left-recursive
badgrammar({[1] = -1 * m.V(1)}, "rule '1'") -- left-recursive
badgrammar({[1] = -1 + m.V(1)}, "rule '1'") -- left-recursive
badgrammar({[1] = 1 * m.V(2), [2] = m.V(2)}, "rule '2'") -- left-recursive
badgrammar({[1] = 1 * m.V(2)^0, [2] = m.P(0)}, "rule '1'") -- inf. loop
badgrammar({ m.V(2), m.V(3)^0, m.P"" }, "rule '2'") -- inf. loop
badgrammar({ m.V(2) * m.V(3)^0, m.V(3)^0, m.P"" }, "rule '1'") -- inf. loop
badgrammar({"x", x = #(m.V(1) * 'a') }, "rule '1'") -- inf. loop
badgrammar({ -(m.V(1) * 'a') }, "rule '1'") -- inf. loop
badgrammar({"x", x = m.P'a'^-1 * m.V"x"}, "rule 'x'") -- left recursive
badgrammar({"x", x = m.P'a' * m.V"y"^1, y = #m.P(1)}, "rule 'x'")
assert(m.match({'a' * -m.V(1)}, "aaa") == 2)
assert(m.match({'a' * -m.V(1)}, "aaaa") == nil)
-- good x bad grammars
m.P{ ('a' * m.V(1))^-1 }
m.P{ -('a' * m.V(1)) }
m.P{ ('abc' * m.V(1))^-1 }
m.P{ -('abc' * m.V(1)) }
badgrammar{ #m.P('abc') * m.V(1) }
badgrammar{ -('a' + m.V(1)) }
m.P{ #('a' * m.V(1)) }
badgrammar{ #('a' + m.V(1)) }
m.P{ m.B{ m.P'abc' } * 'a' * m.V(1) }
badgrammar{ m.B{ m.P'abc' } * m.V(1) }
badgrammar{ ('a' + m.P'bcd')^-1 * m.V(1) }
-- simple tests for maximum sizes:
local p = m.P"a"
for i=1,14 do p = p * p end
p = {}
for i=1,100 do p[i] = m.P"a" end
p = m.P(p)
-- strange values for rule labels
p = m.P{ "print",
print = m.V(print),
[print] = m.V(_G),
[_G] = m.P"a",
}
assert(p:match("a"))
-- initial rule
g = {}
for i = 1, 10 do g["i"..i] = "a" * m.V("i"..i+1) end
g.i11 = m.P""
for i = 1, 10 do
g[1] = "i"..i
local p = m.P(g)
assert(p:match("aaaaaaaaaaa") == 11 - i + 1)
end
print"+"
-- tests for back references
checkerr("back reference 'x' not found", m.match, m.Cb('x'), '')
checkerr("back reference 'b' not found", m.match, m.Cg(1, 'a') * m.Cb('b'), 'a')
p = m.Cg(m.C(1) * m.C(1), "k") * m.Ct(m.Cb("k"))
t = p:match("ab")
checkeq(t, {"a", "b"})
p = m.P(true)
for i = 1, 10 do p = p * m.Cg(1, i) end
for i = 1, 10 do
local p = p * m.Cb(i)
assert(p:match('abcdefghij') == string.sub('abcdefghij', i, i))
end
t = {}
function foo (p) t[#t + 1] = p; return p .. "x" end
p = m.Cg(m.C(2) / foo, "x") * m.Cb"x" *
m.Cg(m.Cb('x') / foo, "x") * m.Cb"x" *
m.Cg(m.Cb('x') / foo, "x") * m.Cb"x" *
m.Cg(m.Cb('x') / foo, "x") * m.Cb"x"
x = {p:match'ab'}
checkeq(x, {'abx', 'abxx', 'abxxx', 'abxxxx'})
checkeq(t, {'ab',
'ab', 'abx',
'ab', 'abx', 'abxx',
'ab', 'abx', 'abxx', 'abxxx'})
-- tests for match-time captures
p = m.P'a' * (function (s, i) return (s:sub(i, i) == 'b') and i + 1 end)
+ 'acd'
assert(p:match('abc') == 3)
assert(p:match('acd') == 4)
local function id (s, i, ...)
return true, ...
end