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if not modules then modules = { } end modules ['l-lpeg'] = {
version = 1.001,
comment = "companion to luat-lib.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
local lpeg = require("lpeg")
lpeg.patterns = lpeg.patterns or { } -- so that we can share
local patterns = lpeg.patterns
local P, R, S, Ct, C, Cs, Cc, V = lpeg.P, lpeg.R, lpeg.S, lpeg.Ct, lpeg.C, lpeg.Cs, lpeg.Cc, lpeg.V
local match = lpeg.match
local digit, sign = R('09'), S('+-')
local cr, lf, crlf = P("\r"), P("\n"), P("\r\n")
local utf8byte = R("\128\191")
patterns.utf8byte = utf8byte
patterns.utf8one = R("\000\127")
patterns.utf8two = R("\194\223") * utf8byte
patterns.utf8three = R("\224\239") * utf8byte * utf8byte
patterns.utf8four = R("\240\244") * utf8byte * utf8byte * utf8byte
patterns.digit = digit
patterns.sign = sign
patterns.cardinal = sign^0 * digit^1
patterns.integer = sign^0 * digit^1
patterns.float = sign^0 * digit^0 * P('.') * digit^1
patterns.number = patterns.float + patterns.integer
patterns.oct = P("0") * R("07")^1
patterns.octal = patterns.oct
patterns.HEX = P("0x") * R("09","AF")^1
patterns.hex = P("0x") * R("09","af")^1
patterns.hexadecimal = P("0x") * R("09","AF","af")^1
patterns.lowercase = R("az")
patterns.uppercase = R("AZ")
patterns.letter = patterns.lowercase + patterns.uppercase
patterns.space = S(" ")
patterns.eol = S("\n\r")
patterns.spacer = S(" \t\f\v") -- + string.char(0xc2, 0xa0) if we want utf (cf mail roberto)
patterns.newline = crlf + cr + lf
patterns.nonspace = 1 - patterns.space
patterns.nonspacer = 1 - patterns.spacer
patterns.whitespace = patterns.eol + patterns.spacer
patterns.nonwhitespace = 1 - patterns.whitespace
patterns.utf8 = patterns.utf8one + patterns.utf8two + patterns.utf8three + patterns.utf8four
patterns.utfbom = P('\000\000\254\255') + P('\255\254\000\000') + P('\255\254') + P('\254\255') + P('\239\187\191')
function lpeg.anywhere(pattern) --slightly adapted from website
return P { P(pattern) + 1 * V(1) } -- why so complex?
end
function lpeg.splitter(pattern, action)
return (((1-P(pattern))^1)/action+1)^0
end
local spacing = patterns.spacer^0 * patterns.newline -- sort of strip
local empty = spacing * Cc("")
local nonempty = Cs((1-spacing)^1) * spacing^-1
local content = (empty + nonempty)^1
local capture = Ct(content^0)
function string:splitlines()
return match(capture,self)
end
patterns.textline = content
--~ local p = lpeg.splitat("->",false) print(match(p,"oeps->what->more")) -- oeps what more
--~ local p = lpeg.splitat("->",true) print(match(p,"oeps->what->more")) -- oeps what->more
--~ local p = lpeg.splitat("->",false) print(match(p,"oeps")) -- oeps
--~ local p = lpeg.splitat("->",true) print(match(p,"oeps")) -- oeps
local splitters_s, splitters_m = { }, { }
local function splitat(separator,single)
local splitter = (single and splitters_s[separator]) or splitters_m[separator]
if not splitter then
separator = P(separator)
if single then
local other, any = C((1 - separator)^0), P(1)
splitter = other * (separator * C(any^0) + "") -- ?
splitters_s[separator] = splitter
else
local other = C((1 - separator)^0)
splitter = other * (separator * other)^0
splitters_m[separator] = splitter
end
end
return splitter
end
lpeg.splitat = splitat
local cache = { }
function string:split(separator)
local c = cache[separator]
if not c then
c = Ct(splitat(separator))
cache[separator] = c
end
return match(c,self)
end
local cache = { }
function string:checkedsplit(separator)
local c = cache[separator]
if not c then
separator = P(separator)
local other = C((1 - separator)^0)
c = Ct(separator^0 * other * (separator^1 * other)^0)
cache[separator] = c
end
return match(c,self)
end
--~ function lpeg.append(list,pp)
--~ local p = pp
--~ for l=1,#list do
--~ if p then
--~ p = p + P(list[l])
--~ else
--~ p = P(list[l])
--~ end
--~ end
--~ return p
--~ end
--~ from roberto's site:
local f1 = string.byte
local function f2(s) local c1, c2 = f1(s,1,2) return c1 * 64 + c2 - 12416 end
local function f3(s) local c1, c2, c3 = f1(s,1,3) return (c1 * 64 + c2) * 64 + c3 - 925824 end
local function f4(s) local c1, c2, c3, c4 = f1(s,1,4) return ((c1 * 64 + c2) * 64 + c3) * 64 + c4 - 63447168 end
patterns.utf8byte = patterns.utf8one/f1 + patterns.utf8two/f2 + patterns.utf8three/f3 + patterns.utf8four/f4
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