Warning: this is an htmlized version!
The original is here, and the conversion rules are here. |
-- -*- coding: raw-text-unix -*- -- preproc.lua - a non-intrusive generic preprocessor -- Author: Eduardo Ochs <[email protected]> -- Version: 2008sep26 -- (find-es "lua5" "preproc") loadlpeg() -- (find-angg "LUA/lua50init.lua" "loadlpeg") cmdA = {} -- one entry for each command (arg parser) cmdC = {} -- one entry for each command (body) cmdname = "" -- accumulator variable cmdargs = {} -- accumulator variable cmdsetname = function (s, p, name) if cmdA[name] then cmdname = name; return true end end cmdsetargs = function (s, p, ...) cmdargs = pack(...) return true end cmddef = function (name, ArgPat, f) cmdA[name] = ArgPat:Cmt(cmdsetargs) cmdC[name] = f end CmdName = (lpeg.R"AZ" ^1):Cmt(cmdsetname) CmdArgs = lpeg.P(function (s, p) return cmdA[cmdname]:match(s, p) end) CmdNoArgs = lpeg.P(function (s, p) error("No args for "..cmdname) end) CmdRun = lpeg.P(function (s, p) return p, cmdC[cmdname](unpack(cmdargs)) end) Cmd = lpeg.P"\\" * CmdName * (CmdArgs + CmdNoArgs) * CmdRun -- (find-angg "LUA/lua50init.lua" "lpeg_togsub") -- (find-angg "LUA/lua50init.lua" "lpeg_gsub_") CmdGsub = Cmd:togsub():Ct() preproc = function (str) return CmdGsub:gsub_(str) end -- The only "exports" from the code above -- are cmddef and preproc. -- Useful. -- (find-angg "LUA/lua50init.lua" "lpeg_balanced") Curly = lpeg.Balanced("{", nil, "}") Space = lpeg.S" \t\n" SCurly = Space^0 * Curly Curly00 = lpeg.P "" Curly0 = Space^0 Curly1 = SCurly Curly2 = SCurly * SCurly Curly3 = SCurly * SCurly * SCurly --[[ -- A demo: -- (find-es "lua5" "preproc") * (eepitch-lua51) * (eepitch-kill) * (eepitch-lua51) ee_dofile "~/LUA/preproc.lua" -- (find-angg "LUA/preproc.lua") F = function (fmt) return function (...) return format(fmt, ...) end end cmddef("ONE", Curly1, F"(one: %s)") cmddef("TWO", Curly2, F"(two: %s %s)") cmddef("THREE", Curly3, F"(three: %s %s %s)") = preproc "\\ONE{foo}{bar}_\\TWO{plic}{ploc}{woo} bleh" --> "(one: foo){bar}_(two: plic ploc){woo} bleh" = preproc "\\ONE{foo}{bar}_\\TWO{plic} no second arg" --> error: No args for TWO --]]