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