liquid_feedback_frontend

annotate env/util/html_to_text.lua @ 1309:32cc544d5a5b

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Cumulative patch for upcoming frontend version 4
author bsw/jbe
date Sun Jul 15 14:07:29 2018 +0200 (2018-07-15)
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bsw/jbe@1309 1 function util.html_to_text(str)
bsw/jbe@1309 2 str = string.gsub(str, "[\0-\32]", " ")
bsw/jbe@1309 3 str = string.gsub(str, "<[Bb][Rr] */?>", "\n")
bsw/jbe@1309 4 str = string.gsub(str, "</?[Pp] *>", "\n\n")
bsw/jbe@1309 5 str = string.gsub(str, "</?[Bb] *>", "**")
bsw/jbe@1309 6 str = string.gsub(str, "</?[Ii] *>", "//")
bsw/jbe@1309 7 str = string.gsub(str, "</?[Ss][Uu][Bb] *>", "__")
bsw/jbe@1309 8 str = string.gsub(str, "</?[Ss][Uu][Pp] *>", "^^")
bsw/jbe@1309 9 str = string.gsub(str, '<[Aa] *[Hh][Rr][Ee][Ff] *= *"([^"]*)" *>', "[[%1 ")
bsw/jbe@1309 10 str = string.gsub(str, "<[Aa] *[Hh][Rr][Ee][Ff] *= *'([^']*)' *>", "[[%1 ")
bsw/jbe@1309 11 str = string.gsub(str, "<[Aa] *[Hh][Rr][Ee][Ff] *= *([^ <>\"']*) *>", "[[%1 ")
bsw/jbe@1309 12 str = string.gsub(str, "</[Aa] *>", "]]")
bsw/jbe@1309 13 str = string.gsub(str, "<[Hh]1 *>", "\n\n###### ")
bsw/jbe@1309 14 str = string.gsub(str, "<[Hh]2 *>", "\n\n##### ")
bsw/jbe@1309 15 str = string.gsub(str, "<[Hh]3 *>", "\n\n#### ")
bsw/jbe@1309 16 str = string.gsub(str, "<[Hh]4 *>", "\n\n### ")
bsw/jbe@1309 17 str = string.gsub(str, "<[Hh]5 *>", "\n\n## ")
bsw/jbe@1309 18 str = string.gsub(str, "<[Hh]6 *>", "\n\n# ")
bsw/jbe@1309 19 str = string.gsub(str, "</[Hh]1 *>", " ######\n\n")
bsw/jbe@1309 20 str = string.gsub(str, "</[Hh]2 *>", " #####\n\n")
bsw/jbe@1309 21 str = string.gsub(str, "</[Hh]3 *>", " ####\n\n")
bsw/jbe@1309 22 str = string.gsub(str, "</[Hh]4 *>", " ###\n\n")
bsw/jbe@1309 23 str = string.gsub(str, "</[Hh]5 *>", " ##\n\n")
bsw/jbe@1309 24 str = string.gsub(str, "</[Hh]6 *>", " #\n\n")
bsw/jbe@1309 25 local li_info = {}
bsw/jbe@1309 26 local pos = 1
bsw/jbe@1309 27 local counters = {}
bsw/jbe@1309 28 while true do
bsw/jbe@1309 29 local list_start, list_stop, list_tagname = string.find(str, "<(/?[OoUu]l) *>", pos)
bsw/jbe@1309 30 if list_tagname then
bsw/jbe@1309 31 list_tagname = string.lower(list_tagname)
bsw/jbe@1309 32 end
bsw/jbe@1309 33 local elem_start, elem_stop = string.find(str, "<[Ll][Ii] *>", pos)
bsw/jbe@1309 34 if list_start and not elem_start then
bsw/jbe@1309 35 pos = list_stop
bsw/jbe@1309 36 elseif elem_start and not list_start then
bsw/jbe@1309 37 pos = elem_stop
bsw/jbe@1309 38 elseif list_start and elem_start then
bsw/jbe@1309 39 if list_start < elem_start then
bsw/jbe@1309 40 pos = list_stop
bsw/jbe@1309 41 else
bsw/jbe@1309 42 pos = elem_stop
bsw/jbe@1309 43 list_tagname = nil
bsw/jbe@1309 44 end
bsw/jbe@1309 45 else
bsw/jbe@1309 46 break
bsw/jbe@1309 47 end
bsw/jbe@1309 48 if list_tagname == "ol" then
bsw/jbe@1309 49 counters[#counters+1] = 0
bsw/jbe@1309 50 elseif list_tagname == "ul" then
bsw/jbe@1309 51 counters[#counters+1] = false
bsw/jbe@1309 52 elseif list_tagname then
bsw/jbe@1309 53 counters[#counters] = nil
bsw/jbe@1309 54 else
bsw/jbe@1309 55 if counters[#counters] then
bsw/jbe@1309 56 counters[#counters] = counters[#counters] + 1
bsw/jbe@1309 57 end
bsw/jbe@1309 58 local string_parts = {}
bsw/jbe@1309 59 for idx, counter in ipairs(counters) do
bsw/jbe@1309 60 if counter then
bsw/jbe@1309 61 string_parts[idx] = tostring(counter) .. ". "
bsw/jbe@1309 62 else
bsw/jbe@1309 63 string_parts[idx] = "* "
bsw/jbe@1309 64 end
bsw/jbe@1309 65 end
bsw/jbe@1309 66 li_info[#li_info+1] = table.concat(string_parts)
bsw/jbe@1309 67 end
bsw/jbe@1309 68 end
bsw/jbe@1309 69 str = string.gsub(str, "</?[OoUu]l *>", "\n\n")
bsw/jbe@1309 70 local li_index = 0
bsw/jbe@1309 71 str = string.gsub(str, "<[Ll][Ii] *>", function()
bsw/jbe@1309 72 li_index = li_index + 1
bsw/jbe@1309 73 return li_info[li_index]
bsw/jbe@1309 74 end)
bsw/jbe@1309 75 str = string.gsub(str, "</[Ll][Ii] *>", "\n")
bsw/jbe@1309 76 str = string.gsub(str, "<[^<>]*>", "")
bsw/jbe@1309 77 str = string.gsub(str, "<", "&lt;")
bsw/jbe@1309 78 str = string.gsub(str, ">", "&gt;")
bsw/jbe@1309 79 str = string.gsub(str, " +", " ")
bsw/jbe@1309 80 str = string.gsub(str, "%f[^\0\n] ", "")
bsw/jbe@1309 81 str = string.gsub(str, " %f[\0\n]", "")
bsw/jbe@1309 82 str = string.gsub(str, "\n\n\n+", "\n\n")
bsw/jbe@1309 83 str = string.gsub(str, "^\n+", "")
bsw/jbe@1309 84 str = string.gsub(str, "\n*$", "\n")
bsw/jbe@1309 85 return str
bsw/jbe@1309 86 end

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