lua和walk_block中的pandoc过滤器

如果wrapper是您的过滤器表，则应执行您想要的操作:function Pandoc (doc) local div = pandoc.Div(doc.blocks) local blocks = pandoc.walk_block(div, wrapper).content return pandoc.Pandoc(blocks, doc.meta)end另一种解决方案是保存和还原元数据，如下所示:local meta = {}return { { Meta = function(m) meta = m; return {} end }, wrapper, { Meta = function(_) return meta; end },}这可能更有效，因为仅对元数据和Code/CodeBlock元素进行序列化/反序列化可能比对整个文档进行序列化更快.I'm trying to apply a LUA filter that would only alter the body of a document, leaving the Metadata untouched. And it's harder than I thought.The filter should prepend and append text to inline elements as well as block elements. If it works for the inline element, here Code, it fails for the block element CodeBlock.function Pandoc(doc) blocks = {} for k,block in pairs(doc.blocks) do table.insert(blocks, pandoc.walk_block(block, { -- Doesn't work!? CodeBlock = function(el) return { pandoc.Para({pandoc.Str("Before")}), el, pandoc.Para({pandoc.Str("After")})} end, -- Works! Code = function(el) return {pandoc.Str("Before"), el, pandoc.Str("After")} end, })) end return pandoc.Pandoc(blocks, doc.meta)endWhat am I missing? Cheers, 解决方案 The issue here is that walk_block and walk_inline process the content of an element, not the element itself.If wrapper is your filter table, this should do what you want:function Pandoc (doc) local div = pandoc.Div(doc.blocks) local blocks = pandoc.walk_block(div, wrapper).content return pandoc.Pandoc(blocks, doc.meta)endAn alternative solution would be to save and restore the metadata, like so:local meta = {}return { { Meta = function(m) meta = m; return {} end }, wrapper, { Meta = function(_) return meta; end },}This is probably more efficient, as serializing/deserializing only metadata and Code/CodeBlock elements is likely faster than doing the same for the full document. 这篇关于lua和walk_block中的pandoc过滤器的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！