63 lines
1.9 KiB
Lua
63 lines
1.9 KiB
Lua
local babycode = {}
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local _escape_html = function(text)
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return text:gsub("[&<>\"']", {
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["&"] = "&",
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["<"] = "<",
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[">"] = ">",
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['"'] = """,
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["'"] = "'"
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})
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end
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---renders babycode to html
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---@param s string input babycode
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---@param escape_html fun(s: string): string function that escapes html
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function babycode.to_html(s, escape_html)
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if not s or s == "" then return "" end
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-- extract code blocks first and store them as placeholders
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-- don't want to process bbcode embedded into a code block
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local code_blocks = {}
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local code_count = 0
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local text = s:gsub("%[code%](.-)%[/code%]", function(code)
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code_count = code_count + 1
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code_blocks[code_count] = code
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return "\1CODE:"..code_count.."\1"
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end)
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-- replace `[url=https://example.com]Example[/url] tags
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text = text:gsub("%[url=([^%]]+)%](.-)%[/url%]", function(url, label)
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return '<a href="'..escape_html(url)..'">'..escape_html(label)..'</a>'
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end)
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-- replace `[url]https://example.com[/url] tags
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text = text:gsub("%[url%]([^%]]+)%[/url%]", function(url)
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return '<a href="'..escape_html(url)..'">'..escape_html(url)..'</a>'
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end)
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-- bold, italics, strikethrough
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text = text:gsub("%[b%](.-)%[/b%]", "<strong>%1</strong>")
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text = text:gsub("%[i%](.-)%[/i%]", "<em>%1</em>")
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text = text:gsub("%[s%](.-)%[/s%]", "<del>%1</del>")
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-- replace loose links
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text = text:gsub("(https?://[%w-_%.%?%.:/%+=&~%@#%%]+[%w-/])", function(url)
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if not text:find('<a[^>]*>'..url..'</a>') then
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return '<a href="'..escape_html(url)..'">'..escape_html(url)..'</a>'
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end
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return url
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end)
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-- replace code block placeholders back with their original contents
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text = text:gsub("\1CODE:(%d+)\1", function(n)
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return "<pre><code>"..code_blocks[tonumber(n)].."</code></pre>"
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end)
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-- finally, normalize newlines replace them with <br>
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text = text:gsub("\r?\n\r?\n+", "<br>"):gsub("\r?\n", "<br>")
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return text
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end
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return babycode
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