Add attribute checks

src/resources/filters/main.lua

@@ -196,6 +196,8 @@ import("./quarto-init/metainit.lua")
 
 -- [/import]
 
+_quarto.modules.attribcheck.enable_attribute_checks()
+
 initCrossrefIndex()
 
 initShortcodeHandlers()

src/resources/filters/modules/attribcheck.lua

@@ -0,0 +1,72 @@
+local io     = require 'io'
+local pandoc = require 'pandoc'
+local utils  = require 'pandoc.utils'
+local ptype  = utils.type
+
+local InlinesMT = debug.getmetatable(pandoc.Inlines{})
+local BlocksMT = debug.getmetatable(pandoc.Blocks{})
+
+local function warn_conversion (expected, actual)
+  -- local dbginfo = debug.getinfo(5, 'Sln')
+  -- warn(actual .. ' instead of ' .. expected .. ': ' ..
+  --      dbginfo.name .. ' in ' .. dbginfo.source .. ':' ..
+  --      dbginfo.currentline)
+  return
+end
+
+local function ensure_inlines(obj)
+  local pt = ptype(obj)
+  if pt == 'Inlines' then
+    return obj
+  elseif pt == 'List' or pt == 'table' then
+    warn_conversion('Inlines', pt)
+    return setmetatable(obj, InlinesMT)
+  else
+    warn_conversion('Inlines', pt)
+    return pandoc.Inlines(obj)
+  end
+end
+
+local function ensure_blocks(obj)
+  local pt = ptype(obj)
+  if pt == 'Blocks' then
+    return obj
+  elseif pt == 'List' or pt == 'table' then
+    warn_conversion('Blocks', pt)
+    return setmetatable(obj, BlocksMT)
+  elseif pt == 'Inlines' then
+    warn_conversion('Blocks', pt)
+    return setmetatable({pandoc.Plain(obj)}, BlocksMT)
+  else
+    warn_conversion('Blocks', pt)
+    return pandoc.Blocks(obj)
+  end
+end
+
+local InlineMT = debug.getmetatable(pandoc.Space())
+local BlockMT = debug.getmetatable(pandoc.HorizontalRule())
+local default_setter = InlineMT.setters.content
+
+local function enable_attribute_checks()
+  InlineMT.setters.content = function (obj, key, value)
+    if obj.tag == 'Note' then
+      default_setter(obj, key, ensure_blocks(value))
+    else
+      default_setter(obj, key, ensure_inlines(value))
+    end
+  end
+  BlockMT.setters.content = function (obj, key, value)
+    local tag = obj.tag
+    if tag == 'Para' or tag == 'Plain' or tag == 'Header' then
+      default_setter(obj, key, ensure_inlines(value))
+    elseif tag == 'Div' or tag == 'BlockQuote' or tag == 'Figure' then
+      default_setter(obj, key, ensure_blocks(value))
+    else
+      default_setter(obj, key, value)
+    end
+  end
+end
+
+return {
+  enable_attribute_checks = enable_attribute_checks
+}

src/resources/filters/modules/import_all.lua

@@ -3,6 +3,7 @@
 
 _quarto.modules = {
   astshortcode = require("modules/astshortcode"),
+  attribcheck = require("modules/attribcheck"),
   authors = require("modules/authors"),
   brand = require("modules/brand/brand"),
   callouts = require("modules/callouts"),