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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, gmatch, format, char, byte, rep, lower = string.sub, string.gmatch, string.format, string.char, string.byte, string.rep, string.lower
local lpegmatch, patterns = lpeg.match, lpeg.patterns
local P, S, C, Ct, Cc, Cs = lpeg.P, lpeg.S, lpeg.C, lpeg.Ct, lpeg.Cc, lpeg.Cs
-- Some functions are already defined in l-lpeg and maybe some from here will
-- move there (unless we also expose caches).
-- if not string.split then
--
-- 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$","%2")) -- interesting pattern
-- end
local unquoted = patterns.squote * C(patterns.nosquote) * patterns.squote
+ patterns.dquote * C(patterns.nodquote) * patterns.dquote
function string.unquoted(str)
return lpegmatch(unquoted,str) or str
end
-- print(string.unquoted("test"))
-- print(string.unquoted([["t\"est"]]))
-- print(string.unquoted([["t\"est"x]]))
-- print(string.unquoted("\'test\'"))
-- print(string.unquoted('"test"'))
-- print(string.unquoted('"test"'))
function string.quoted(str)
return format("%q",str) -- always double quote
end
function string.count(str,pattern) -- variant 3
local n = 0
for _ in gmatch(str,pattern) do -- not for utf
n = n + 1
end
return n
end
function string.limit(str,n,sentinel) -- not utf proof
if #str > n then
sentinel = sentinel or "..."
return sub(str,1,(n-#sentinel)) .. sentinel
else
return str
end
end
local stripper = patterns.stripper
local fullstripper = patterns.fullstripper
local collapser = patterns.collapser
local longtostring = patterns.longtostring
function string.strip(str)
return lpegmatch(stripper,str) or ""
end
function string.fullstrip(str)
return lpegmatch(fullstripper,str) or ""
end
function string.collapsespaces(str)
return lpegmatch(collapser,str) or ""
end
function string.longtostring(str)
return lpegmatch(longtostring,str) or ""
end
-- function string.is_empty(str)
-- return not find(str,"%S")
-- end
local pattern = P(" ")^0 * P(-1) -- maybe also newlines
-- patterns.onlyspaces = pattern
function string.is_empty(str)
if str == "" then
return true
else
return lpegmatch(pattern,str) and true or false
end
end
-- if not string.escapedpattern then
--
-- local patterns_escapes = {
-- ["%"] = "%%",
-- ["."] = "%.",
-- ["+"] = "%+", ["-"] = "%-", ["*"] = "%*",
-- ["["] = "%[", ["]"] = "%]",
-- ["("] = "%(", [")"] = "%)",
-- -- ["{"] = "%{", ["}"] = "%}"
-- -- ["^"] = "%^", ["$"] = "%$",
-- }
--
-- local simple_escapes = {
-- ["-"] = "%-",
-- ["."] = "%.",
-- ["?"] = ".",
-- ["*"] = ".*",
-- }
--
-- function string.escapedpattern(str,simple)
-- return (gsub(str,".",simple and simple_escapes or patterns_escapes))
-- end
--
-- function string.topattern(str,lowercase,strict)
-- if str == "" then
-- return ".*"
-- else
-- str = gsub(str,".",simple_escapes)
-- if lowercase then
-- str = lower(str)
-- end
-- if strict then
-- return "^" .. str .. "$"
-- else
-- return str
-- end
-- end
-- end
--
-- end
--- needs checking
local anything = patterns.anything
local allescapes = Cc("%") * S(".-+%?()[]*") -- also {} and ^$ ?
local someescapes = Cc("%") * S(".-+%()[]") -- also {} and ^$ ?
local matchescapes = Cc(".") * S("*?") -- wildcard and single match
local pattern_a = Cs ( ( allescapes + anything )^0 )
local pattern_b = Cs ( ( someescapes + matchescapes + anything )^0 )
local pattern_c = Cs ( Cc("^") * ( someescapes + matchescapes + anything )^0 * Cc("$") )
function string.escapedpattern(str,simple)
return lpegmatch(simple and pattern_b or pattern_a,str)
end
function string.topattern(str,lowercase,strict)
if str=="" or type(str) ~= "string" then
return ".*"
elseif strict then
str = lpegmatch(pattern_c,str)
else
str = lpegmatch(pattern_b,str)
end
if lowercase then
return lower(str)
else
return str
end
end
-- print(string.escapedpattern("abc*234",true))
-- print(string.escapedpattern("12+34*.tex",false))
-- print(string.escapedpattern("12+34*.tex",true))
-- print(string.topattern ("12+34*.tex",false,false))
-- print(string.topattern ("12+34*.tex",false,true))
function string.valid(str,default)
return (type(str) == "string" and str ~= "" and str) or default or nil
end
-- handy fallback
string.itself = function(s) return s end
-- also handy (see utf variant)
local pattern_c = Ct( C(1) ^0) -- string and not utf !
local pattern_b = Ct((C(1)/byte)^0)
function string.totable(str,bytes)
return lpegmatch(bytes and pattern_b or pattern_c,str)
end
-- handy from within tex:
local replacer = lpeg.replacer("@","%%") -- Watch the escaped % in lpeg!
function string.tformat(fmt,...)
return format(lpegmatch(replacer,fmt),...)
end
-- obsolete names:
string.quote = string.quoted
string.unquote = string.unquoted
|
