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|
if not modules then modules = { } end modules ['util-str'] = {
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"
}
utilities = utilities or {}
utilities.strings = utilities.strings or { }
local strings = utilities.strings
local load = load
local format, gsub, rep, sub = string.format, string.gsub, string.rep, string.sub
local concat = table.concat
local P, V, C, S, R, Ct, Cs, Cp, Carg = lpeg.P, lpeg.V, lpeg.C, lpeg.S, lpeg.R, lpeg.Ct, lpeg.Cs, lpeg.Cp, lpeg.Carg
local patterns, lpegmatch = lpeg.patterns, lpeg.match
local utfchar, utfbyte = utf.char, utf.byte
local setmetatableindex = table.setmetatableindex
--
local stripper = patterns.stripzeros
local function points(n)
return (not n or n == 0) and "0pt" or lpegmatch(stripper,format("%.5fpt",n/65536))
end
local function basepoints(n)
return (not n or n == 0) and "0bp" or lpegmatch(stripper,format("%.5fbp", n*(7200/7227)/65536))
end
number.points = points
number.basepoints = basepoints
-- str = " \n \ntest \n test\ntest "
-- print("["..string.gsub(string.collapsecrlf(str),"\n","+").."]")
local rubish = patterns.spaceortab^0 * patterns.newline
local anyrubish = patterns.spaceortab + patterns.newline
local anything = patterns.anything
local stripped = (patterns.spaceortab^1 / "") * patterns.newline
local leading = rubish^0 / ""
local trailing = (anyrubish^1 * patterns.endofstring) / ""
local redundant = rubish^3 / "\n"
local pattern = Cs(leading * (trailing + redundant + stripped + anything)^0)
function strings.collapsecrlf(str)
return lpegmatch(pattern,str)
end
-- The following functions might end up in another namespace.
local repeaters = { } -- watch how we also moved the -1 in depth-1 to the creator
function strings.newrepeater(str,offset)
offset = offset or 0
local s = repeaters[str]
if not s then
s = { }
repeaters[str] = s
end
local t = s[offset]
if t then
return t
end
t = { }
setmetatableindex(t, function(t,k)
if not k then
return ""
end
local n = k + offset
local s = n > 0 and rep(str,n) or ""
t[k] = s
return s
end)
s[offset] = t
return t
end
-- local dashes = strings.newrepeater("--",-1)
-- print(dashes[2],dashes[3],dashes[1])
local extra, tab, start = 0, 0, 4, 0
local nspaces = strings.newrepeater(" ")
local pattern =
Carg(1) / function(t)
extra, tab, start = 0, t or 7, 1
end
* Cs((
Cp() * patterns.tab / function(position)
local current = (position - start + 1) + extra
local spaces = tab-(current-1) % tab
if spaces > 0 then
extra = extra + spaces - 1
return nspaces[spaces] -- rep(" ",spaces)
else
return ""
end
end
+ patterns.newline * Cp() / function(position)
extra, start = 0, position
end
+ patterns.anything
)^1)
function strings.tabtospace(str,tab)
return lpegmatch(pattern,str,1,tab or 7)
end
-- local t = {
-- "1234567123456712345671234567",
-- "\tb\tc",
-- "a\tb\tc",
-- "aa\tbb\tcc",
-- "aaa\tbbb\tccc",
-- "aaaa\tbbbb\tcccc",
-- "aaaaa\tbbbbb\tccccc",
-- "aaaaaa\tbbbbbb\tcccccc\n aaaaaa\tbbbbbb\tcccccc",
-- "one\n two\nxxx three\nxx four\nx five\nsix",
-- }
-- for k=1,#t do
-- print(strings.tabtospace(t[k]))
-- end
function strings.striplong(str) -- strips all leading spaces
str = gsub(str,"^%s*","")
str = gsub(str,"[\n\r]+ *","\n")
return str
end
-- local template = string.striplong([[
-- aaaa
-- bb
-- cccccc
-- ]])
function strings.nice(str)
str = gsub(str,"[:%-+_]+"," ") -- maybe more
return str
end
-- Work in progress. Interesting is that compared to the built-in this
-- is faster in luatex than in luajittex where we have a comparable speed.
local n = 0
-- we are somewhat sloppy in parsing prefixes as it's not that critical
--
-- this does not work out ok:
--
-- function fnc(...) -- 1,2,3
-- print(...,...,...) -- 1,1,1,2,3
-- end
local prefix_any = C((S("+- .") + R("09"))^0)
local prefix_tab = C((1-R("az","AZ","09","%%"))^0)
-- we've split all cases as then we can optimize them (let's omit the fuzzy u)
local format_s = function(f)
n = n + 1
if f and f ~= "" then
return format("format('%%%ss',(select(%s,...)))",f,n)
else
return format("(select(%s,...))",n)
end
end
local format_q = function()
n = n + 1
return format("format('%%q',(select(%s,...)))",n) -- maybe an own lpeg
end
local format_i = function(f)
n = n + 1
if f and f ~= "" then
return format("format('%%%si',(select(%s,...)))",f,n)
else
return format("(select(%s,...))",n)
end
end
local format_d = format_i
local format_f = function(f)
n = n + 1
return format("format('%%%sf',(select(%s,...)))",f,n)
end
local format_g = function(f)
n = n + 1
return format("format('%%%sg',(select(%s,...)))",f,n)
end
local format_G = function(f)
n = n + 1
return format("format('%%%sG',(select(%s,...)))",f,n)
end
local format_e = function(f)
n = n + 1
return format("format('%%%se',(select(%s,...)))",f,n)
end
local format_E = function(f)
n = n + 1
return format("format('%%%sE',(select(%s,...)))",f,n)
end
local format_x = function(f)
n = n + 1
return format("format('%%%sx',(select(%s,...)))",f,n)
end
local format_X = function(f)
n = n + 1
return format("format('%%%sX',(select(%s,...)))",f,n)
end
local format_o = function(f)
n = n + 1
return format("format('%%%so',(select(%s,...)))",f,n)
end
local format_c = function()
n = n + 1
return format("utfchar((select(%s,...)))",n)
end
local format_r = function(f)
n = n + 1
return format("format('%%%s.0f',(select(%s,...)))",f,n)
end
local format_v = function(f)
n = n + 1
if f == "-" then
f = sub(f,2)
return format("format('%%%sx',utfbyte((select(%s,...))))",f == "" and "05" or f,n)
else
return format("format('0x%%%sx',utfbyte((select(%s,...))))",f == "" and "05" or f,n)
end
end
local format_V = function(f)
n = n + 1
if f == "-" then
f = sub(f,2)
return format("format('%%%sX',utfbyte((select(%s,...))))",f == "" and "05" or f,n)
else
return format("format('0x%%%sX',utfbyte((select(%s,...))))",f == "" and "05" or f,n)
end
end
local format_u = function(f)
n = n + 1
if f == "-" then
f = sub(f,2)
return format("format('%%%sx',utfbyte((select(%s,...))))",f == "" and "05" or f,n)
else
return format("format('u+%%%sx',utfbyte((select(%s,...))))",f == "" and "05" or f,n)
end
end
local format_U = function(f)
n = n + 1
if f == "-" then
f = sub(f,2)
return format("format('%%%sX',utfbyte((select(%s,...))))",f == "" and "05" or f,n)
else
return format("format('U+%%%sX',utfbyte((select(%s,...))))",f == "" and "05" or f,n)
end
end
local format_p = function()
n = n + 1
return format("points((select(%s,...)))",n)
end
local format_b = function()
n = n + 1
return format("basepoints((select(%s,...)))",n)
end
local format_t = function(f)
n = n + 1
if f and f ~= "" then
return format("concat((select(%s,...)),%q)",n,f)
else
return format("concat((select(%s,...)))",n)
end
end
local format_l = function()
n = n + 1
return format("(select(%s,...) and 'true' or 'false')",n)
end
local format_a = function(s)
return format("%q",s)
end
local builder = Ct { "start",
start = (P("%") * (
V("s") + V("q")
+ V("i") + V("d")
+ V("f") + V("g") + V("G") + V("e") + V("E")
+ V("x") + V("X") + V("o")
--
+ V("c")
--
+ V("r")
+ V("v") + V("V") + V("u") + V("U")
+ V("p") + V("b")
+ V("t")
+ V("l")
)
+ V("a")
)^0,
--
["s"] = (prefix_any * P("s")) / format_s, -- %s => regular %s (string)
["q"] = (prefix_any * P("q")) / format_q, -- %q => regular %q (quoted string)
["i"] = (prefix_any * P("i")) / format_i, -- %i => regular %i (integer)
["d"] = (prefix_any * P("d")) / format_d, -- %d => regular %d (integer)
["f"] = (prefix_any * P("f")) / format_f, -- %f => regular %f (float)
["g"] = (prefix_any * P("g")) / format_g, -- %g => regular %g (float)
["G"] = (prefix_any * P("G")) / format_G, -- %G => regular %G (float)
["e"] = (prefix_any * P("e")) / format_e, -- %e => regular %e (float)
["E"] = (prefix_any * P("E")) / format_E, -- %E => regular %E (float)
["x"] = (prefix_any * P("x")) / format_x, -- %x => regular %x (hexadecimal)
["X"] = (prefix_any * P("X")) / format_X, -- %X => regular %X (HEXADECIMAL)
["o"] = (prefix_any * P("o")) / format_o, -- %o => regular %o (octal)
--
["c"] = (prefix_any * P("c")) / format_c, -- %c => utf character (extension to regular)
--
["r"] = (prefix_any * P("r")) / format_r, -- %r => round
["v"] = (prefix_any * P("v")) / format_v, -- %v => 0x0a1b2 (when - no 0x)
["V"] = (prefix_any * P("V")) / format_V, -- %V => 0x0A1B2 (when - no 0x)
["u"] = (prefix_any * P("u")) / format_u, -- %u => u+0a1b2 (when - no u+)
["U"] = (prefix_any * P("U")) / format_U, -- %U => U+0A1B2 (when - no U+)
["p"] = (prefix_any * P("p")) / format_p, -- %p => 12.345pt / maybe: P (and more units)
["b"] = (prefix_any * P("b")) / format_b, -- %b => 12.342bp / maybe: B (and more units)
["t"] = (prefix_tab * P("t")) / format_t, -- %t => concat
["l"] = (prefix_tab * P("l")) / format_l, -- %l => boolean
--
["a"] = Cs(((1-P("%"))^1 + P("%%")/"%%")^1) / format_a, -- %a => text (including %%)
}
-- we can be clever and only alias what is needed
local template = [[
local format = string.format
local concat = table.concat
local points = number.points
local basepoints = number.basepoints
local utfchar = utf.char
local utfbyte = utf.byte
return function(...)
return %s
end
]]
local function make(t,str)
n = 0
local p = lpegmatch(builder,str)
-- inspect(p)
local c = format(template,concat(p,".."))
-- inspect(c)
formatter = load(c)()
t[str] = formatter
return formatter
end
local formatters = string.formatters or { }
string.formatters = formatters
setmetatableindex(formatters,make)
function string.makeformatter(str)
return formatters[str]
end
function string.formatter(str,...)
return formatters[str](...)
end
-- local p1 = "%s test %f done %p and %c and %V or %+t or %%"
-- local p2 = "%s test %f done %s and %s and 0x%05X or %s or %%"
--
-- local t = { 1,2,3,4 }
-- local r = ""
--
-- local format, formatter, formatters = string.format, string.formatter, string.formatters
-- local utfchar, utfbyte, concat, points = utf.char, utf.byte, table.concat, number.points
--
-- local c = os.clock()
-- local f = formatters[p1]
-- for i=1,500000 do
-- -- r = formatters[p1]("hans",123.45,123.45,123,"a",t)
-- r = formatter(p1,"hans",123.45,123.45,123,"a",t)
-- -- r = f("hans",123.45,123.45,123,"a",t)
-- end
-- print(os.clock()-c,r)
--
-- local c = os.clock()
-- for i=1,500000 do
-- r = format(p2,"hans",123.45,points(123.45),utfchar(123),utfbyte("a"),concat(t,"+"))
-- end
-- print(os.clock()-c,r)
-- local f = format
-- function string.format(fmt,...)
-- print(fmt,...)
-- return f(fmt,...)
-- end
|