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Diffstat (limited to 'tex/context/base/mkiv/data-fil.lua')
| -rw-r--r-- | tex/context/base/mkiv/data-fil.lua | 113 |
1 files changed, 113 insertions, 0 deletions
diff --git a/tex/context/base/mkiv/data-fil.lua b/tex/context/base/mkiv/data-fil.lua new file mode 100644 index 000000000..b699fc9e3 --- /dev/null +++ b/tex/context/base/mkiv/data-fil.lua @@ -0,0 +1,113 @@ +if not modules then modules = { } end modules ['data-fil'] = { + 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 trace_locating = false trackers.register("resolvers.locating", function(v) trace_locating = v end) + +local report_files = logs.reporter("resolvers","files") + +local resolvers = resolvers +local resolveprefix = resolvers.resolve + +local finders, openers, loaders, savers = resolvers.finders, resolvers.openers, resolvers.loaders, resolvers.savers +local locators, hashers, generators, concatinators = resolvers.locators, resolvers.hashers, resolvers.generators, resolvers.concatinators + +local checkgarbage = utilities.garbagecollector and utilities.garbagecollector.check + +function locators.file(specification) + local filename = specification.filename + local realname = resolveprefix(filename) -- no shortcut + if realname and realname ~= '' and lfs.isdir(realname) then + if trace_locating then + report_files("file locator %a found as %a",filename,realname) + end + resolvers.appendhash('file',filename,true) -- cache + elseif trace_locating then + report_files("file locator %a not found",filename) + end +end + +function hashers.file(specification) + local pathname = specification.filename + local content = caches.loadcontent(pathname,'files') + resolvers.registerfilehash(pathname,content,content==nil) +end + +function generators.file(specification) + local pathname = specification.filename + local content = resolvers.scanfiles(pathname,false,true) -- scan once + resolvers.registerfilehash(pathname,content,true) +end + +concatinators.file = file.join + +function finders.file(specification,filetype) + local filename = specification.filename + local foundname = resolvers.findfile(filename,filetype) + if foundname and foundname ~= "" then + if trace_locating then + report_files("file finder: %a found",filename) + end + return foundname + else + if trace_locating then + report_files("file finder: %a not found",filename) + end + return finders.notfound() + end +end + +-- The default textopener will be overloaded later on. + +function openers.helpers.textopener(tag,filename,f) + return { + reader = function() return f:read () end, + close = function() logs.show_close(filename) return f:close() end, + } +end + +function openers.file(specification,filetype) + local filename = specification.filename + if filename and filename ~= "" then + local f = io.open(filename,"r") + if f then + if trace_locating then + report_files("file opener: %a opened",filename) + end + return openers.helpers.textopener("file",filename,f) + end + end + if trace_locating then + report_files("file opener: %a not found",filename) + end + return openers.notfound() +end + +function loaders.file(specification,filetype) + local filename = specification.filename + if filename and filename ~= "" then + local f = io.open(filename,"rb") + if f then + logs.show_load(filename) + if trace_locating then + report_files("file loader: %a loaded",filename) + end + local s = f:read("*a") -- io.readall(f) is faster but we never have large files here + if checkgarbage then + checkgarbage(#s) + end + f:close() + if s then + return true, s, #s + end + end + end + if trace_locating then + report_files("file loader: %a not found",filename) + end + return loaders.notfound() +end |