115 lines
3.4 KiB
Lua
115 lines
3.4 KiB
Lua
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local lpeg = require("lpeg")
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lpeg.locale(lpeg)
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local V,P,C,S,B,Cs = lpeg.V,lpeg.P,lpeg.C,lpeg.S,lpeg.B,lpeg.Cs
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--Characters to escape in the body text
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local escapes = {
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["&"] = "&",
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["<"] = "<",
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[">"] = ">",
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}
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local esctbl = {}
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for char,_ in pairs(escapes) do
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table.insert(esctbl,char)
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end
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local escapematch = string.format("([%s])",table.concat(esctbl))
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local function sanitize_item(capture)
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return escapes[capture] or capture
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end
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local function sanitize(text)
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local ret,_ = string.gsub(text,escapematch,sanitize_item)
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return ret
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end
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--Grammar
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local space = S" \t\r"^0
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local special = P{
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P"**" + P"''" + P"'''" +
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P"__" + P"==" + P"~~" +
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P"\n>" + P"\n<" + P"\n" +
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P"[code]" + P"[spoiler]"
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}
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local word = Cs((1 - special)^1) * space / sanitize
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--Generates a pattern that formats text inside matching 'seq' tags with format
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--ex wrap("^^",[[<sup>%s</sup>]])
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--will wrap text "5^^3^^" as "5<sup>3</sup>"
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local function wrap(seq,format)
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return P(seq) * Cs(((1 - P(seq)) * space)^1) * P(seq) * space / function(a)
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return string.format(format,sanitize(a))
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end
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end
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--Generates a pattern that formats text inside opening and closing "name" tags
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--with a format, BB forum style
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local function tag(name,format)
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local start_tag = P(string.format("[%s]",name))
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local end_tag = P(string.format("[/%s]",name))
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return start_tag * Cs(((1 - end_tag) * space)^1) * end_tag * space / function(a)
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return string.format(format,sanitize(a))
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end
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end
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local grammar = P{
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"chunk";
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--regular
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spoiler = wrap("**",[[<span class="spoiler">%s</span>]]),
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spoiler2 = tag("spoiler",[[<span class="spoiler2">%s</span>]]),
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italic = wrap("''",[[<i>%s</i>]]),
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bold = wrap("'''",[[<b>%s</b>]]),
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underline = wrap("__",[[<u>%s</u>]]),
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heading = wrap("==",[[<h2>%s</h2>]]),
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strike = wrap("~~",[[<s>%s</s>]]),
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code = tag("code",[[<pre><code>%s</code></pre>]]),
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greentext = P">" * (B"\n>" + B">") * Cs((V"marked" + word)^0) / function(a)
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return string.format([[<span class="greentext">>%s</span>]],a)
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end,
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pinktext = P"<" * (B"\n<" + B"<") * Cs((V"marked" + word)^0) / function(a)
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return string.format([[<span class="pinktext"><%s</span>]],a)
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end,
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marked = V"spoiler" + V"bold" + V"italic" + V"underline" + V"heading" + V"strike" + V"spoiler2" + V"code",
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plainline = (V"marked" + word)^0,
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line = Cs(V"greentext" + V"pinktext" + V"plainline" + P"") * P"\n" / function(a)
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return string.format("<p>%s",a)
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end,
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ending = C(P(1)^0) / sanitize,
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chunk = V"line"^0 * V"plainline" * V"ending"
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}
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--[=[
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local text = [[
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<pinktext on the first line
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this is **a big** test with ''italics''!
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we need to > sanitize < things that could be tags
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like really <b> badly </b>
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words can include any'single item without=penalty
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Can you use '''one tag ==within== another tag'''?
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let's see if [spoiler]spoiler tags work[/spoiler]
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things might even __go over
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multiple lines__ blah
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Let's test out those [code]
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code tag,s and see how well
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they work
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here's ome
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preformated <with injection>
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text
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[/code]
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>Or have blank lines
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one important thing is that greentext > should not start in the middle of a line
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>this next line is a green text, what if I include **markup** inside it?
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<and after '''it is''' a pinktext
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>because of some of these restrictions **bold text
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cannot go over multiple lines** in a green text
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>greentext on the last line
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<pinktext on the last line
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]]
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]=]
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return function(text)
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return table.concat({grammar:match(text .. "\n")}," ")
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end
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--for k,v in pairs({grammar:match(text)}) do
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-- print(k,":",v)
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--end
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