stable 2010-05-24 13:10

1 files changed, 152 insertions, 0 deletions

diff --git a/tex/context/base/data-lua.lua b/tex/context/base/data-lua.lua
new file mode 100644
index 000000000..988133fbe
--- /dev/null
+++ b/tex/context/base/data-lua.lua
@@ -0,0 +1,152 @@
+if not modules then modules = { } end modules ['data-lua'] = {
+    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"
+}
+
+-- some loading stuff ... we might move this one to slot 2 depending
+-- on the developments (the loaders must not trigger kpse); we could
+-- of course use a more extensive lib path spec
+
+local trace_locating = false  trackers.register("resolvers.locating", function(v) trace_locating = v end)
+
+local gsub, insert = string.gsub, table.insert
+local unpack = unpack or table.unpack
+
+local  libformats = { 'luatexlibs', 'tex', 'texmfscripts', 'othertextfiles' } -- 'luainputs'
+local clibformats = { 'lib' }
+
+local _path_, libpaths, _cpath_, clibpaths
+
+function package.libpaths()
+    if not _path_ or package.path ~= _path_ then
+        _path_ = package.path
+        libpaths = file.split_path(_path_,";")
+    end
+    return libpaths
+end
+
+function package.clibpaths()
+    if not _cpath_ or package.cpath ~= _cpath_ then
+        _cpath_ = package.cpath
+        clibpaths = file.split_path(_cpath_,";")
+    end
+    return clibpaths
+end
+
+local function thepath(...)
+    local t = { ... } t[#t+1] = "?.lua"
+    local path = file.join(unpack(t))
+    if trace_locating then
+        logs.report("fileio","! appending '%s' to 'package.path'",path)
+    end
+    return path
+end
+
+local p_libpaths, a_libpaths = { }, { }
+
+function package.append_libpath(...)
+    insert(a_libpath,thepath(...))
+end
+
+function package.prepend_libpath(...)
+    insert(p_libpaths,1,thepath(...))
+end
+
+-- beware, we need to return a loadfile result !
+
+local function loaded(libpaths,name,simple)
+    for i=1,#libpaths do -- package.path, might become option
+        local libpath = libpaths[i]
+        local resolved = gsub(libpath,"%?",simple)
+        if trace_locating then -- more detail
+            logs.report("fileio","! checking for '%s' on 'package.path': '%s' => '%s'",simple,libpath,resolved)
+        end
+        if resolvers.isreadable.file(resolved) then
+            if trace_locating then
+                logs.report("fileio","! lib '%s' located via 'package.path': '%s'",name,resolved)
+            end
+            return loadfile(resolved)
+        end
+    end
+end
+
+
+package.loaders[2] = function(name) -- was [#package.loaders+1]
+    if trace_locating then -- mode detail
+        logs.report("fileio","! locating '%s'",name)
+    end
+    for i=1,#libformats do
+        local format = libformats[i]
+        local resolved = resolvers.find_file(name,format) or ""
+        if trace_locating then -- mode detail
+            logs.report("fileio","! checking for '%s' using 'libformat path': '%s'",name,format)
+        end
+        if resolved ~= "" then
+            if trace_locating then
+                logs.report("fileio","! lib '%s' located via environment: '%s'",name,resolved)
+            end
+            return loadfile(resolved)
+        end
+    end
+    -- libpaths
+    local libpaths, clibpaths = package.libpaths(), package.clibpaths()
+    local simple = gsub(name,"%.lua$","")
+    local simple = gsub(simple,"%.","/")
+    local resolved = loaded(p_libpaths,name,simple) or loaded(libpaths,name,simple) or loaded(a_libpaths,name,simple)
+    if resolved then
+        return resolved
+    end
+    --
+    local libname = file.addsuffix(simple,os.libsuffix)
+    for i=1,#clibformats do
+        -- better have a dedicated loop
+        local format = clibformats[i]
+        local paths = resolvers.expanded_path_list_from_var(format)
+        for p=1,#paths do
+            local path = paths[p]
+            local resolved = file.join(path,libname)
+            if trace_locating then -- mode detail
+                logs.report("fileio","! checking for '%s' using 'clibformat path': '%s'",libname,path)
+            end
+            if resolvers.isreadable.file(resolved) then
+                if trace_locating then
+                    logs.report("fileio","! lib '%s' located via 'clibformat': '%s'",libname,resolved)
+                end
+                return package.loadlib(resolved,name)
+            end
+        end
+    end
+    for i=1,#clibpaths do -- package.path, might become option
+        local libpath = clibpaths[i]
+        local resolved = gsub(libpath,"?",simple)
+        if trace_locating then -- more detail
+            logs.report("fileio","! checking for '%s' on 'package.cpath': '%s'",simple,libpath)
+        end
+        if resolvers.isreadable.file(resolved) then
+            if trace_locating then
+                logs.report("fileio","! lib '%s' located via 'package.cpath': '%s'",name,resolved)
+            end
+            return package.loadlib(resolved,name)
+        end
+    end
+    -- just in case the distribution is messed up
+    if trace_loading then -- more detail
+        logs.report("fileio","! checking for '%s' using 'luatexlibs': '%s'",name)
+    end
+    local resolved = resolvers.find_file(file.basename(name),'luatexlibs') or ""
+    if resolved ~= "" then
+        if trace_locating then
+            logs.report("fileio","! lib '%s' located by basename via environment: '%s'",name,resolved)
+        end
+        return loadfile(resolved)
+    end
+    if trace_locating then
+        logs.report("fileio",'? unable to locate lib: %s',name)
+    end
+--  return "unable to locate " .. name
+end
+
+resolvers.loadlualib = require