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-rw-r--r--Master/texmf-dist/tex/context/base/l-package.lua319
1 files changed, 319 insertions, 0 deletions
diff --git a/Master/texmf-dist/tex/context/base/l-package.lua b/Master/texmf-dist/tex/context/base/l-package.lua
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+++ b/Master/texmf-dist/tex/context/base/l-package.lua
@@ -0,0 +1,319 @@
+if not modules then modules = { } end modules ['l-package'] = {
+ 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"
+}
+
+-- Code moved from data-lua and changed into a plug-in.
+
+-- We overload the regular loader. We do so because we operate mostly in
+-- tds and use our own loader code. Alternatively we could use a more
+-- extensive definition of package.path and package.cpath but even then
+-- we're not done. Also, we now have better tracing.
+--
+-- -- local mylib = require("libtest")
+-- -- local mysql = require("luasql.mysql")
+
+local type = type
+local gsub, format = string.gsub, string.format
+
+local P, S, Cs, lpegmatch = lpeg.P, lpeg.S, lpeg.Cs, lpeg.match
+
+local package = package
+local searchers = package.searchers or package.loaders
+
+-- dummies
+
+local filejoin = file and file.join or function(path,name) return path .. "/" .. name end
+local isreadable = file and file.is_readable or function(name) local f = io.open(name) if f then f:close() return true end end
+local addsuffix = file and file.addsuffix or function(name,suffix) return name .. "." .. suffix end
+
+-- local separator, concatinator, placeholder, pathofexecutable, ignorebefore = string.match(package.config,"(.-)\n(.-)\n(.-)\n(.-)\n(.-)\n")
+--
+-- local config = {
+-- separator = separator, -- \ or /
+-- concatinator = concatinator, -- ;
+-- placeholder = placeholder, -- ? becomes name
+-- pathofexecutable = pathofexecutable, -- ! becomes executables dir (on windows)
+-- ignorebefore = ignorebefore, -- - remove all before this when making lua_open
+-- }
+
+local function cleanpath(path) -- hm, don't we have a helper for this?
+ return path
+end
+
+local pattern = Cs((((1-S("\\/"))^0 * (S("\\/")^1/"/"))^0 * (P(".")^1/"/"+P(1))^1) * -1)
+
+local function lualibfile(name)
+ return lpegmatch(pattern,name) or name
+end
+
+local helpers = package.helpers or {
+ cleanpath = cleanpath,
+ lualibfile = lualibfile,
+ trace = false,
+ report = function(...) print(format(...)) end,
+ builtin = {
+ ["preload table"] = searchers[1], -- special case, built-in libs
+ ["path specification"] = searchers[2],
+ ["cpath specification"] = searchers[3],
+ ["all in one fallback"] = searchers[4], -- special case, combined libs
+ },
+ methods = {
+ },
+ sequence = {
+ "already loaded",
+ "preload table",
+ "lua extra list",
+ "lib extra list",
+ "path specification",
+ "cpath specification",
+ "all in one fallback",
+ "not loaded",
+ }
+}
+
+package.helpers = helpers
+
+local methods = helpers.methods
+local builtin = helpers.builtin
+
+-- extra tds/ctx paths ... a bit of overhead for efficient tracing
+
+local extraluapaths = { }
+local extralibpaths = { }
+local luapaths = nil -- delayed
+local libpaths = nil -- delayed
+local oldluapath = nil
+local oldlibpath = nil
+
+local nofextralua = -1
+local nofextralib = -1
+local nofpathlua = -1
+local nofpathlib = -1
+
+local function listpaths(what,paths)
+ local nofpaths = #paths
+ if nofpaths > 0 then
+ for i=1,nofpaths do
+ helpers.report("using %s path %i: %s",what,i,paths[i])
+ end
+ else
+ helpers.report("no %s paths defined",what)
+ end
+ return nofpaths
+end
+
+local function getextraluapaths()
+ if helpers.trace and #extraluapaths ~= nofextralua then
+ nofextralua = listpaths("extra lua",extraluapaths)
+ end
+ return extraluapaths
+end
+
+local function getextralibpaths()
+ if helpers.trace and #extralibpaths ~= nofextralib then
+ nofextralib = listpaths("extra lib",extralibpaths)
+ end
+ return extralibpaths
+end
+
+local function getluapaths()
+ local luapath = package.path or ""
+ if oldluapath ~= luapath then
+ luapaths = file.splitpath(luapath,";")
+ oldluapath = luapath
+ nofpathlua = -1
+ end
+ if helpers.trace and #luapaths ~= nofpathlua then
+ nofpathlua = listpaths("builtin lua",luapaths)
+ end
+ return luapaths
+end
+
+local function getlibpaths()
+ local libpath = package.cpath or ""
+ if oldlibpath ~= libpath then
+ libpaths = file.splitpath(libpath,";")
+ oldlibpath = libpath
+ nofpathlib = -1
+ end
+ if helpers.trace and #libpaths ~= nofpathlib then
+ nofpathlib = listpaths("builtin lib",libpaths)
+ end
+ return libpaths
+end
+
+package.luapaths = getluapaths
+package.libpaths = getlibpaths
+package.extraluapaths = getextraluapaths
+package.extralibpaths = getextralibpaths
+
+local hashes = {
+ lua = { },
+ lib = { },
+}
+
+local function registerpath(tag,what,target,...)
+ local pathlist = { ... }
+ local cleanpath = helpers.cleanpath
+ local trace = helpers.trace
+ local report = helpers.report
+ local hash = hashes[what]
+ --
+ local function add(path)
+ local path = cleanpath(path)
+ if not hash[path] then
+ target[#target+1] = path
+ hash[path] = true
+ if trace then
+ report("registered %s path %s: %s",tag,#target,path)
+ end
+ else
+ if trace then
+ report("duplicate %s path: %s",tag,path)
+ end
+ end
+ end
+ --
+ for p=1,#pathlist do
+ local path = pathlist[p]
+ if type(path) == "table" then
+ for i=1,#path do
+ add(path[i])
+ end
+ else
+ add(path)
+ end
+ end
+ return paths
+end
+
+helpers.registerpath = registerpath
+
+function package.extraluapath(...)
+ registerpath("extra lua","lua",extraluapaths,...)
+end
+
+function package.extralibpath(...)
+ registerpath("extra lib","lib",extralibpaths,...)
+end
+
+-- lib loader (used elsewhere)
+
+local function loadedaslib(resolved,rawname) -- todo: strip all before first -
+ local base = gsub(rawname,"%.","_")
+ -- so, we can do a require("foo/bar") and initialize bar
+ -- local base = gsub(file.basename(rawname),"%.","_")
+ local init = "luaopen_" .. gsub(base,"%.","_")
+ if helpers.trace then
+ helpers.report("calling loadlib with '%s' with init '%s'",resolved,init)
+ end
+ return package.loadlib(resolved,init)
+end
+
+helpers.loadedaslib = loadedaslib
+
+-- wrapped and new loaders
+
+local function loadedbypath(name,rawname,paths,islib,what)
+ local trace = helpers.trace
+ for p=1,#paths do
+ local path = paths[p]
+ local resolved = filejoin(path,name)
+ if trace then
+ helpers.report("%s path, identifying '%s' on '%s'",what,name,path)
+ end
+ if isreadable(resolved) then
+ if trace then
+ helpers.report("%s path, '%s' found on '%s'",what,name,resolved)
+ end
+ if islib then
+ return loadedaslib(resolved,rawname)
+ else
+ return loadfile(resolved)
+ end
+ end
+ end
+end
+
+helpers.loadedbypath = loadedbypath
+
+methods["already loaded"] = function(name)
+ return package.loaded[name]
+end
+
+methods["preload table"] = function(name)
+ return builtin["preload table"](name)
+end
+
+methods["lua extra list"] = function(name)
+ return loadedbypath(addsuffix(lualibfile(name),"lua" ),name,getextraluapaths(),false,"lua")
+end
+
+methods["lib extra list"] = function(name)
+ return loadedbypath(addsuffix(lualibfile(name),os.libsuffix),name,getextralibpaths(),true, "lib")
+end
+
+methods["path specification"] = function(name)
+ getluapaths() -- triggers list building and tracing
+ return builtin["path specification"](name)
+end
+
+methods["cpath specification"] = function(name)
+ getlibpaths() -- triggers list building and tracing
+ return builtin["cpath specification"](name)
+end
+
+methods["all in one fallback"] = function(name)
+ return builtin["all in one fallback"](name)
+end
+
+methods["not loaded"] = function(name)
+ if helpers.trace then
+ helpers.report("unable to locate '%s'",name or "?")
+ end
+ return nil
+end
+
+local level = 0
+
+function helpers.loaded(name)
+ local sequence = helpers.sequence
+ level = level + 1
+ for i=1,#sequence do
+ local method = sequence[i]
+ if helpers.trace then
+ helpers.report("%s, level '%s', method '%s', name '%s'","locating",level,method,name)
+ end
+ local result, rest = methods[method](name)
+ if type(result) == "function" then
+ if helpers.trace then
+ helpers.report("%s, level '%s', method '%s', name '%s'","found",level,method,name)
+ end
+ level = level - 1
+ return result, rest
+ end
+ end
+ -- safeguard, we never come here
+ level = level - 1
+ return nil
+end
+
+function helpers.unload(name)
+ if helpers.trace then
+ if package.loaded[name] then
+ helpers.report("unloading, name '%s', %s",name,"done")
+ else
+ helpers.report("unloading, name '%s', %s",name,"not loaded")
+ end
+ end
+ package.loaded[name] = nil
+end
+
+-- overloading require does not work out well so we need to push it in
+-- front ..
+
+table.insert(searchers,1,helpers.loaded)