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if not modules then modules = { } end modules ['l-string'] = {
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 string = string
local sub, gsub, find, match, gmatch, format, char, byte, rep, lower = string.sub, string.gsub, string.find, string.match, string.gmatch, string.format, string.char, string.byte, string.rep, string.lower
local lpegmatch, S, C, Ct = lpeg.match, lpeg.S, lpeg.C, lpeg.Ct
-- some functions may disappear as they are not used anywhere
if not string.split then
-- this will be overloaded by a faster lpeg variant
function string.split(str,pattern)
local t = { }
if #str > 0 then
local n = 1
for s in gmatch(str..pattern,"(.-)"..pattern) do
t[n] = s
n = n + 1
end
end
return t
end
end
function string.unquoted(str)
return (gsub(str,"^([\"\'])(.*)%1$","%2"))
end
--~ function stringunquoted(str)
--~ if find(str,"^[\'\"]") then
--~ return sub(str,2,-2)
--~ else
--~ return str
--~ end
--~ end
function string.quoted(str)
return format("%q",str) -- always "
end
function string.count(str,pattern) -- variant 3
local n = 0
for _ in gmatch(str,pattern) do -- not for utf
n = n + 1
end
return n
end
function string.limit(str,n,sentinel) -- not utf proof
if #str > n then
sentinel = sentinel or "..."
return sub(str,1,(n-#sentinel)) .. sentinel
else
return str
end
end
local space = S(" \t\v\n")
local nospace = 1 - space
local stripper = space^0 * C((space^0 * nospace^1)^0) -- roberto's code
function string.strip(str)
return lpegmatch(stripper,str) or ""
end
function string.is_empty(str)
return not find(str,"%S")
end
local patterns_escapes = {
["%"] = "%%",
["."] = "%.",
["+"] = "%+", ["-"] = "%-", ["*"] = "%*",
["["] = "%[", ["]"] = "%]",
["("] = "%(", [")"] = "%)",
-- ["{"] = "%{", ["}"] = "%}"
-- ["^"] = "%^", ["$"] = "%$",
}
local simple_escapes = {
["-"] = "%-",
["."] = "%.",
["?"] = ".",
["*"] = ".*",
}
function string.escapedpattern(str,simple)
return (gsub(str,".",simple and simple_escapes or patterns_escapes))
end
function string.topattern(str,lowercase,strict)
if str == "" then
return ".*"
else
str = gsub(str,".",simple_escapes)
if lowercase then
str = lower(str)
end
if strict then
return "^" .. str .. "$"
else
return str
end
end
end
function string.valid(str,default)
return (type(str) == "string" and str ~= "" and str) or default or nil
end
-- obsolete names:
string.quote = string.quoted
string.unquote = string.unquoted
-- handy fallback
string.itself = function(s) return s end
-- also handy (see utf variant)
local pattern = Ct(C(1)^0)
function string.totable(str)
return lpegmatch(pattern,str)
end
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