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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"
}
lpeg = require("lpeg")
local P, R, S, Ct, C, Cs, Cc = lpeg.P, lpeg.R, lpeg.S, lpeg.Ct, lpeg.C, lpeg.Cs, lpeg.Cc
local match = lpeg.match
--~ l-lpeg.lua :
--~ lpeg.digit = lpeg.R('09')^1
--~ lpeg.sign = lpeg.S('+-')^1
--~ lpeg.cardinal = lpeg.P(lpeg.sign^0 * lpeg.digit^1)
--~ lpeg.integer = lpeg.P(lpeg.sign^0 * lpeg.digit^1)
--~ lpeg.float = lpeg.P(lpeg.sign^0 * lpeg.digit^0 * lpeg.P('.') * lpeg.digit^1)
--~ lpeg.number = lpeg.float + lpeg.integer
--~ lpeg.oct = lpeg.P("0") * lpeg.R('07')^1
--~ lpeg.hex = lpeg.P("0x") * (lpeg.R('09') + lpeg.R('AF'))^1
--~ lpeg.uppercase = lpeg.P("AZ")
--~ lpeg.lowercase = lpeg.P("az")
--~ lpeg.eol = lpeg.S('\r\n\f')^1 -- includes formfeed
--~ lpeg.space = lpeg.S(' ')^1
--~ lpeg.nonspace = lpeg.P(1-lpeg.space)^1
--~ lpeg.whitespace = lpeg.S(' \r\n\f\t')^1
--~ lpeg.nonwhitespace = lpeg.P(1-lpeg.whitespace)^1
local hash = { }
function lpeg.anywhere(pattern) --slightly adapted from website
return P { P(pattern) + 1 * lpeg.V(1) }
end
function lpeg.startswith(pattern) --slightly adapted
return P(pattern)
end
function lpeg.splitter(pattern, action)
return (((1-P(pattern))^1)/action+1)^0
end
-- variant:
--~ local parser = lpeg.Ct(lpeg.splitat(newline))
local crlf = P("\r\n")
local cr = P("\r")
local lf = P("\n")
local space = S(" \t\f\v") -- + string.char(0xc2, 0xa0) if we want utf (cf mail roberto)
local newline = crlf + cr + lf
local spacing = space^0 * newline
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
lpeg.linebyline = content -- better make a sublibrary
--~ 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.L(list,pp)
--~ local p = pp
--~ for l=1,#list do
--~ if p then
--~ p = p + lpeg.P(list[l])
--~ else
--~ p = lpeg.P(list[l])
--~ end
--~ end
--~ return p
--~ end
--~ from roberto's site:
--~
--~ -- decode a two-byte UTF-8 sequence
--~ local function f2 (s)
--~ local c1, c2 = string.byte(s, 1, 2)
--~ return c1 * 64 + c2 - 12416
--~ end
--~
--~ -- decode a three-byte UTF-8 sequence
--~ local function f3 (s)
--~ local c1, c2, c3 = string.byte(s, 1, 3)
--~ return (c1 * 64 + c2) * 64 + c3 - 925824
--~ end
--~
--~ -- decode a four-byte UTF-8 sequence
--~ local function f4 (s)
--~ local c1, c2, c3, c4 = string.byte(s, 1, 4)
--~ return ((c1 * 64 + c2) * 64 + c3) * 64 + c4 - 63447168
--~ end
--~
--~ local cont = lpeg.R("\128\191") -- continuation byte
--~
--~ local utf8 = lpeg.R("\0\127") / string.byte
--~ + lpeg.R("\194\223") * cont / f2
--~ + lpeg.R("\224\239") * cont * cont / f3
--~ + lpeg.R("\240\244") * cont * cont * cont / f4
--~
--~ local decode_pattern = lpeg.Ct(utf8^0) * -1
local cont = R("\128\191") -- continuation byte
lpeg.utf8 = R("\0\127") + R("\194\223") * cont + R("\224\239") * cont * cont + R("\240\244") * cont * cont * cont
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