prevent overriding foundational definitions

Dependencies

• [2] SEJ76JDA keep templates in sync
• [*] TNRO6KLZ new live app

Change contents

• edit in main.lua at line 39
  [4.1269]

  [4.1269]
  + app.freeze_all_existing_definitions()
• edit in main.lua at line 51
  [2.45]

  [4.1492]
  + end

  +

  + -- Everything that exists before we start loading the live files is frozen and

  + -- can't be edited live.

  + function app.freeze_all_existing_definitions()

  + app.Frozen_definitions = {on=true} -- special case for version 1

  + local done = {}

  + done[app.Frozen_definitions]=true

  + app.freeze_all_existing_definitions_in(_G, {}, done)

  + end

  +

  + function app.freeze_all_existing_definitions_in(tab, scopes, done)

  + -- track duplicates to avoid cycles like _G._G, _G._G._G, etc.

  + if done[tab] then return end

  + done[tab] = true

  + for name,binding in pairs(tab) do

  + local full_name = app.full_name(scopes, name)

  + --? print(full_name)

  + app.Frozen_definitions[full_name] = true

  + if type(binding) == 'table' and full_name ~= 'package' then -- var 'package' contains copies of all modules, but not the best name; rely on people to not modify package.loaded.io.open, etc.

  + table.insert(scopes, name)

  + app.freeze_all_existing_definitions_in(binding, scopes, done)

  + table.remove(scopes)

  + end

  + end

  + end

  +

  + function app.full_name(scopes, name)

  + local ns = table.concat(scopes, '.')

  + if #ns == 0 then return name end

  + return ns..'.'..name
• edit in main.lua at line 294
  [4.6748]

  [4.6748]
  + if app.Frozen_definitions[binding] then

  + app.send('ERROR definition '..binding..' is part of Freewheeling infrastructure and cannot be safely edited live.')

  + return

  + end