sile-typesetter / sile / 11135083927

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/packages/inputfilter/init.lua
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local base = require("packages.base")
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local package = pl.class(base)




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package._name = "inputfilter"




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function package:transformContent (content, transformFunction, extraArgs)




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   local newContent = {}




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   for k, v in SU.sortedpairs(content) do




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      if type(k) == "number" then




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         if type(v) == "string" then




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            local transformed = transformFunction(v, content, extraArgs)




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            if type(transformed) == "table" then




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               for i = 1, #transformed do




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                  newContent[#newContent + 1] = transformed[i]




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               end










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            else










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               newContent[#newContent + 1] = transformed




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            end










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         else










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            newContent[#newContent + 1] = self:transformContent(v, transformFunction, extraArgs)




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         end










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      else











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         newContent[k] = v




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      end










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   end











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   return newContent




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end










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function package.createCommand (_, pos, col, lno, command, options, content)




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   local position = { lno = lno, col = col, pos = pos }




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   return SU.ast.createCommand(command, options, content, position)




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end










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function package:_init ()




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   base._init(self)




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   self:deprecatedExport("createCommand", self.createCommand)




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   self:deprecatedExport("transformContent", self.transformContent)




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end










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package.documentation = [[










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\begin{document}










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The \autodoc:package{inputfilter} package provides ways for class authors to transform the input of a SILE document after it is parsed but before it is processed.










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It does this by allowing you to rewrite the abstract syntax tree representing the document.










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Loading \autodoc:package{inputfilter} into your class with \code{class:loadPackage("inputfilter")} provides you with two new Lua functions: \code{transformContent} and \code{createCommand}.










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\code{transformContent} takes a content tree and applies a transformation function to the text within it.










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See \url{https://sile-typesetter.org/examples/inputfilter.sil} for a simple example, and \url{https://sile-typesetter.org/examples/chordmode.sil} for a more complete one.










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\end{document}











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]]




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return package




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