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if not modules then modules = { } end modules ['data-exp'] = {
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 format, gsub, find, gmatch, lower = string.format, string.gsub, string.find, string.gmatch, string.lower
local concat, sort = table.concat, table.sort
local lpegmatch, lpegpatterns = lpeg.match, lpeg.patterns
local lpegCt, lpegCs, lpegP, lpegC, lpegS = lpeg.Ct, lpeg.Cs, lpeg.P, lpeg.C, lpeg.S
local type, next = type, next
local ostype = os.type
local collapsepath = file.collapsepath
local trace_locating = false trackers.register("resolvers.locating", function(v) trace_locating = v end)
local trace_expansions = false trackers.register("resolvers.expansions", function(v) trace_expansions = v end)
local report_resolvers = logs.new("resolvers")
local resolvers = resolvers
-- As this bit of code is somewhat special it gets its own module. After
-- all, when working on the main resolver code, I don't want to scroll
-- past this every time.
-- {a,b,c,d}
-- a,b,c/{p,q,r},d
-- a,b,c/{p,q,r}/d/{x,y,z}//
-- a,b,c/{p,q/{x,y,z},r},d/{p,q,r}
-- a,b,c/{p,q/{x,y,z},r},d/{p,q,r}
-- a{b,c}{d,e}f
-- {a,b,c,d}
-- {a,b,c/{p,q,r},d}
-- {a,b,c/{p,q,r}/d/{x,y,z}//}
-- {a,b,c/{p,q/{x,y,z}},d/{p,q,r}}
-- {a,b,c/{p,q/{x,y,z},w}v,d/{p,q,r}}
-- {$SELFAUTODIR,$SELFAUTOPARENT}{,{/share,}/texmf{-local,.local,}/web2c}
-- this one is better and faster, but it took me a while to realize
-- that this kind of replacement is cleaner than messy parsing and
-- fuzzy concatenating we can probably gain a bit with selectively
-- applying lpeg, but experiments with lpeg parsing this proved not to
-- work that well; the parsing is ok, but dealing with the resulting
-- table is a pain because we need to work inside-out recursively
local dummy_path_expr = "^!*unset/*$"
local function do_first(a,b)
local t, n = { }, 0
for s in gmatch(b,"[^,]+") do
n = n + 1
t[n] = a .. s
end
return "{" .. concat(t,",") .. "}"
end
local function do_second(a,b)
local t, n = { }, 0
for s in gmatch(a,"[^,]+") do
n = n + 1
t[n] = s .. b
end
return "{" .. concat(t,",") .. "}"
end
local function do_both(a,b)
local t, n = { }, 0
for sa in gmatch(a,"[^,]+") do
for sb in gmatch(b,"[^,]+") do
n = n + 1
t[n] = sa .. sb
end
end
return "{" .. concat(t,",") .. "}"
end
local function do_three(a,b,c)
return a .. b.. c
end
local stripper_1 = lpeg.stripper("{}@")
local replacer_1 = lpeg.replacer {
{ ",}", ",@}" },
{ "{,", "{@," },
}
local function splitpathexpr(str, newlist, validate)
-- no need for further optimization as it is only called a
-- few times, we can use lpeg for the sub
if trace_expansions then
report_resolvers("expanding variable '%s'",str)
end
local t, ok, done = newlist or { }, false, false
local n = #t
str = lpegmatch(replacer_1,str)
while true do
done = false
while true do
str, ok = gsub(str,"([^{},]+){([^{}]+)}",do_first)
if ok > 0 then done = true else break end
end
while true do
str, ok = gsub(str,"{([^{}]+)}([^{},]+)",do_second)
if ok > 0 then done = true else break end
end
while true do
str, ok = gsub(str,"{([^{}]+)}{([^{}]+)}",do_both)
if ok > 0 then done = true else break end
end
str, ok = gsub(str,"({[^{}]*){([^{}]+)}([^{}]*})",do_three)
if ok > 0 then done = true end
if not done then break end
end
str = lpegmatch(stripper_1,str)
if validate then
for s in gmatch(str,"[^,]+") do
s = validate(s)
if s then
n = n + 1
t[n] = s
end
end
else
for s in gmatch(str,"[^,]+") do
n = n + 1
t[n] = s
end
end
if trace_expansions then
for k=1,#t do
report_resolvers("% 4i: %s",k,t[k])
end
end
return t
end
local function validate(s)
local isrecursive = find(s,"//$")
s = collapsepath(s)
if isrecursive then
s = s .. "//"
end
return s ~= "" and not find(s,dummy_path_expr) and s
end
resolvers.validatedpath = validate -- keeps the trailing //
function resolvers.expandedpathfromlist(pathlist) -- maybe not a list, just a path
-- a previous version fed back into pathlist
local newlist, ok = { }, false
for k=1,#pathlist do
if find(pathlist[k],"[{}]") then
ok = true
break
end
end
if ok then
for k=1,#pathlist do
splitpathexpr(pathlist[k],newlist,validate)
end
else
local n = 0
for k=1,#pathlist do
for p in gmatch(pathlist[k],"([^,]+)") do
p = validate(p)
if p ~= "" then
n = n + 1
newlist[n] = p
end
end
end
end
return newlist
end
-- We also put some cleanup code here.
--~ local cleanup -- used recursively
--~ local homedir
--~ cleanup = lpeg.replacer {
--~ {
--~ "!",
--~ ""
--~ },
--~ {
--~ "\\",
--~ "/"
--~ },
--~ {
--~ "~" ,
--~ function()
--~ return lpegmatch(cleanup,environment.homedir)
--~ end
--~ },
--~ }
--~ function resolvers.cleanpath(str)
--~ return str and lpegmatch(cleanup,str)
--~ end
local cleanup = lpeg.replacer {
{ "!" , "" },
{ "\\" , "/" },
}
local homedir
function resolvers.cleanpath(str)
if not homedir then
homedir = lpegmatch(cleanup,environment.homedir or "")
if homedir == string.char(127) or homedir == "" or not lfs.isdir(homedir) then
if trace_expansions then
report_resolvers("no home dir set, ignoring dependent paths")
end
function resolvers.cleanpath(str)
if find(str,"~") then
return "" -- special case
else
return str and lpegmatch(cleanup,str)
end
end
else
cleanup = lpeg.replacer {
{ "!" , "" },
{ "\\" , "/" },
{ "~" , homedir },
}
function resolvers.cleanpath(str)
return str and lpegmatch(cleanup,str)
end
end
end
return resolvers.cleanpath(str)
end
-- This one strips quotes and funny tokens.
--~ local stripper = lpegCs(
--~ lpegpatterns.unspacer * lpegpatterns.unsingle
--~ + lpegpatterns.undouble * lpegpatterns.unspacer
--~ )
local expandhome = lpegP("~") / "$HOME" -- environment.homedir
local dodouble = lpegP('"')/"" * (expandhome + (1 - lpegP('"')))^0 * lpegP('"')/""
local dosingle = lpegP("'")/"" * (expandhome + (1 - lpegP("'")))^0 * lpegP("'")/""
local dostring = (expandhome + 1 )^0
local stripper = lpegCs(
lpegpatterns.unspacer * (dosingle + dodouble + dostring) * lpegpatterns.unspacer
)
function resolvers.checkedvariable(str) -- assumes str is a string
return lpegmatch(stripper,str) or str
end
-- The path splitter:
-- A config (optionally) has the paths split in tables. Internally
-- we join them and split them after the expansion has taken place. This
-- is more convenient.
local cache = { }
local splitter = lpegCt(lpeg.splitat(lpegS(ostype == "windows" and ";" or ":;"))) -- maybe add ,
local function splitconfigurationpath(str) -- beware, this can be either a path or a { specification }
if str then
local found = cache[str]
if not found then
if str == "" then
found = { }
else
str = gsub(str,"\\","/")
local split = lpegmatch(splitter,str)
found = { }
local noffound = 0
for i=1,#split do
local s = split[i]
if not find(s,"^{*unset}*") then
noffound = noffound + 1
found[noffound] = s
end
end
if trace_expansions then
report_resolvers("splitting path specification '%s'",str)
for k=1,noffound do
report_resolvers("% 4i: %s",k,found[k])
end
end
cache[str] = found
end
end
return found
end
end
resolvers.splitconfigurationpath = splitconfigurationpath
function resolvers.splitpath(str)
if type(str) == 'table' then
return str
else
return splitconfigurationpath(str)
end
end
function resolvers.joinpath(str)
if type(str) == 'table' then
return file.joinpath(str)
else
return str
end
end
-- The next function scans directories and returns a hash where the
-- entries are either strings or tables.
-- starting with . or .. etc or funny char
--~ local l_forbidden = lpegS("~`!#$%^&*()={}[]:;\"\'||\\/<>,?\n\r\t")
--~ local l_confusing = lpegP(" ")
--~ local l_character = lpegpatterns.utf8
--~ local l_dangerous = lpegP(".")
--~ local l_normal = (l_character - l_forbidden - l_confusing - l_dangerous) * (l_character - l_forbidden - l_confusing^2)^0 * lpegP(-1)
--~ ----- l_normal = l_normal * lpegCc(true) + lpegCc(false)
--~ local function test(str)
--~ print(str,lpegmatch(l_normal,str))
--~ end
--~ test("ヒラギノ明朝 Pro W3")
--~ test("..ヒラギノ明朝 Pro W3")
--~ test(":ヒラギノ明朝 Pro W3;")
--~ test("ヒラギノ明朝 /Pro W3;")
--~ test("ヒラギノ明朝 Pro W3")
local weird = lpegP(".")^1 + lpeg.anywhere(lpegS("~`!#$%^&*()={}[]:;\"\'||<>,?\n\r\t"))
function resolvers.scanfiles(specification)
if trace_locating then
report_resolvers("scanning path '%s'",specification)
end
local attributes, directory = lfs.attributes, lfs.dir
local files = { __path__ = specification }
local n, m, r = 0, 0, 0
local function scan(spec,path)
local full = (path == "" and spec) or (spec .. path .. '/')
local dirs = { }
for name in directory(full) do
if not lpegmatch(weird,name) then
local mode = attributes(full..name,'mode')
if mode == 'file' then
n = n + 1
local f = files[name]
if f then
if type(f) == 'string' then
files[name] = { f, path }
else
f[#f+1] = path
end
else -- probably unique anyway
files[name] = path
local lower = lower(name)
if name ~= lower then
files["remap:"..lower] = name
r = r + 1
end
end
elseif mode == 'directory' then
m = m + 1
if path ~= "" then
dirs[#dirs+1] = path..'/'..name
else
dirs[#dirs+1] = name
end
end
end
end
if #dirs > 0 then
sort(dirs)
for i=1,#dirs do
scan(spec,dirs[i])
end
end
end
scan(specification .. '/',"")
files.__files__, files.__directories__, files.__remappings__ = n, m, r
if trace_locating then
report_resolvers("%s files found on %s directories with %s uppercase remappings",n,m,r)
end
return files
end
--~ print(table.serialize(resolvers.scanfiles("t:/sources")))
|