81 lines
2.2 KiB
Lua
81 lines
2.2 KiB
Lua
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local label_map = {} -- label has to be unique!
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-- helper functions for debugging
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local function show(s)
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io.stderr:write("[Debug] " .. s .. "\n")
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end
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local function collect_labels(blk)
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if blk.identifier and blk.identifier ~= "" then
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label_map[blk.identifier] = blk:clone()
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end
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return nil
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end
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local function dfs(blk, stack) -- depth first search on a top level blk
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-- check for identifier and build label_map
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if blk.identifier and blk.identifier ~= "" then
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label_map[blk.identifier] = blk:clone()
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table.insert(stack, blk.identifier)
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end
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-- recurse into child blocks
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-- type matters. see https://hackage-content.haskell.org/package/pandoc-types-1.23.1/docs/Text-Pandoc-Definition.html#t:Block
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-- fortunately, we only need to recurse on divs.
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if blk.t == 'Div' then
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for _, inner in ipairs(blk.content) do
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dfs(inner, stack)
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end
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end
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-- pop
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if blk.identifier and blk.identifier ~= "" then
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table.remove(stack) -- pop
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end
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end
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local function words(s)
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local res = {}
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for part in s:gmatch("[^,]+") do -- split by commas
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local trimmed = part:match("^%s*(.-)%s*$") -- remove leading/trailing spaces
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if trimmed ~= "" then
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table.insert(res, trimmed)
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end
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end
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return res
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end
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local function replace(e)
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local include = e.attributes["include"]
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if include then
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local blocks = {}
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-- Replace the Div contents
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for _, l in ipairs(words(include)) do
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if label_map[l] then
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table.insert(blocks, label_map[l]:clone())
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show("insert [" .. label_map[l].identifier .. ']\n')
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else
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io.stderr:write("Cannot find AST node with label " .. l .. "\n")
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end
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end
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return pandoc.Div(blocks, e.attr)
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end
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return e -- no change
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end
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return {
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-- traverse = 'topdown',
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Pandoc = function(doc)
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-- collect labels
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for _, blk in ipairs(doc.blocks) do
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dfs(blk,{})
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end
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-- replace
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for i, blk in ipairs(doc.blocks) do
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doc.blocks[i] = replace(blk)
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end
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return doc
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end
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}
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