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- local preproc = {}
- preproc.directives = {}
-
- function preproc.parsewords(line) -- string -- table -- Returns a table of words from the string *line*, parsing quotes and escapes.
- local rt = {""}
- local escaped, quoted = false, false
- for c in line:gmatch(".") do
- if escaped then
- rt[#rt] = rt[#rt]..c
- elseif c == '"' or c == "'" then
- quoted = not quoted
- elseif c == "\\" then
- escaped = true
- elseif c:match("%s") and not quoted and rt[#rt]:len() > 0 then
- rt[#rt+1] = ""
- else
- rt[#rt] = rt[#rt]..c
- end
- end
- return rt
- end
-
- function preproc.line(line) -- string -- -- Returns either a function - which can be called to get lines until it returns nil - or a string from processing *line* using preprocessor directives.
- if line:match("^%-%-#") then
- local directive, args = line:match("^%-%-#(%S+)%s(.+)")
- print(directive,args)
- local args = preproc.parsewords(args)
- if preproc.directives[directive] then
- return preproc.directives[directive](table.unpack(args))
- else
- error("unknown preprocessor directive: "..directive)
- end
- else
- return line
- end
- end
-
- function preproc.preproc(...) -- string -- string -- Returns the output from preprocessing the files listed in *...*.
- local tA = {...}
- local output = ""
- for _,fname in ipairs(tA) do
- local f,e = io.open(fname)
- if not f then error("unable to open file "..fname..": "..e) end
- for line in f:lines() do
- local r = preproc.line(line)
- if type(r) == "function" then
- while true do
- local rs = r()
- if not rs then break end
- output = output .. rs .. "\n"
- end
- else
- output = output .. r .. "\n"
- end
- end
- end
- return output
- end
-
- preproc.directives.include = preproc.preproc
-
- return setmetatable(preproc,{__call=function(_,...)
- local tA = {...}
- local out = table.remove(tA,#tA)
- local f,e = io.open(out,"wb")
- if not f then error("unable to open file "..out..": "..e) end
- f:write(preproc.preproc(table.unpack(tA)))
- f:close()
- end})
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