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55 lines
1.7 KiB
Lua
55 lines
1.7 KiB
Lua
require "util"
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local lpeg = require "lpeg"
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lpeg.locale(lpeg)
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local S,C,Ct,Cc,Cg,Cf,P,V = lpeg.S, lpeg.C, lpeg.Ct, lpeg.Cc, lpeg.Cg, lpeg.Cf, lpeg.P, lpeg.V
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local parserLogger = print
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local sp = S" \t" ^0 + -1
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local wh = S" \t\r\n" ^0 + -1
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local nl = S"\r\n" ^1 + -1
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local id = (lpeg.alpha + '_') * (lpeg.alnum + '_')^0
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local addr = C(id) * ('.' * C(id))^-1
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local todo = sp * 'TODO:' * sp * (1-nl)^0 / parserLogger * wh -- TODO log location
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local commOL = sp * '//' * sp * (1-nl)^0 * wh
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local commML = sp * '/*' * wh * (P(1)-'*/')^0 * '*/' * wh
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local comm = commOL + commML + todo
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local glue = P'<>'/'glue' *wh
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local divertSym = '->' *wh
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local divertEndSym = C('END') *wh
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local divertEnd = divertSym * divertEndSym
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local divertJump = Ct(divertSym/'divert' * addr * wh)
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local divert = divertEnd + divertJump
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local knotHead = P('=')^2/'knot' * wh * C(id) * wh * P('=')^0 * wh
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local stitchHead = P('=')^1/'stitch' * wh * C(id) * wh * P('=')^0 * wh
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local optionDiv = '[' * C((P(1) - ']')^0) * ']'
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local ink = P({
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"lines",
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knott = Ct(knotHead * (V'line'-knotHead)^0 * wh),
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stitch = Ct(stitchHead * (V'line'-stitchHead)^0 * wh),
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stmt = glue + divert + V'knott' + V'stitch' + optionDiv + comm,
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text = C((1-nl-V'stmt')^1) *wh,
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textE = C((1-nl-V'stmt')^0) *wh,
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optionAnsWithDiv = V'textE' * optionDiv * V'textE' * wh,
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optionAnsWithoutDiv = V'textE' * Cc ''* Cc ''* wh, -- huh?
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optionHead = P'*'/'option' * sp * (V'optionAnsWithDiv' + V'optionAnsWithoutDiv'),
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option = Ct(V'optionHead' * (V'line'-V'optionHead'-V'knott'-V'stitch')^0 * wh), --TODO which can by toplevel only?
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choice = Ct(Cc'choice' * V'option'^1),
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para = Ct(Cc'para' * V'text'),
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line = V'stmt' + V'choice' + V'para',
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lines = Ct(V'line'^0)
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})
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return ink;
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