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#!/usr/bin/env nomsu -V3.7
#
This file contains code for defining ways to upgrade code between different versions
of Nomsu.
use "lib/os.nom"
%UPGRADES = {}
action [upgrade to %version via %upgrade_fn]:
%UPGRADES.%version = %upgrade_fn
%ACTION_UPGRADES = ({} with fallback % -> {})
action [upgrade action %stub to %version via %upgrade_fn]:
%ACTION_UPGRADES.%version.%stub = %upgrade_fn
parse [upgrade %tree to %version as %body] as (..)
upgrade to %version via ([%] -> (% with %tree -> %body))
compile [upgrade action %actions to %version as %body] to:
if (%actions is "Action" syntax tree):
%actions = \[%actions]
%lua = (Lua "")
for %action in %actions:
%replacements = {}
for %i in 1 to (size of %action):
if (%action.%i.type is "Var"):
%replacements.(%action.%i.1) = "\(\%tree as lua id)[\%i]"
%needs_mangle = (no)
local action [make tree %t]:
when:
(%t is "Var" syntax tree):
if %replacements.(%t.1):
return %replacements.(%t.1)
..else:
external %needs_mangle = (yes)
return ".."
\(%t.type){source=\(quote "\(%t.source)"), \(..)
quote "\(%t.1) \000\(=lua "string.format('%X', __MANGLE_INDEX)")"
..}
(%t is syntax tree):
%args = []
for %k = %v in %t:
if ((type of %k) == "number"):
%args::add (make tree %v)
..else:
%args::add "\%k=\(make tree %v)"
return "\(%t.type){\(%args joined with ", ")}"
else:
return (quote %t)
unless ("\%lua" == ""): %lua::append "\n"
%retval = (make tree %body)
%lua::append (..)
Lua ".."
A_upgrade_action_1_to_2_via_3(\(quote %action.stub), \(%version as lua expr), function(\(..)
\%tree as lua id
..)
\("__MANGLE_INDEX = (__MANGLE_INDEX or 0) + 1\n " if (%needs_mangle) else "")\
..return \%retval
end)
return %lua
action [..]
%tree upgraded from %start_version to %end_version
%tree upgraded to %end_version from %start_version
..:
local action [%ver as list] ((% as number) for % in %ver matching "[0-9]+")
%versions = {}
for %v = % in %UPGRADES:
%versions.%v = (yes)
for %v = % in %ACTION_UPGRADES:
%versions.%v = (yes)
%versions = ((keys in %versions) sorted by % -> (% as list))
for %ver in %versions:
if ((%ver as list) <= (%start_version as list)): do next %ver
if ((%ver as list) > (%end_version as list)): stop %ver
if %ACTION_UPGRADES.%ver:
%tree = (..)
%tree with % -> (..)
if ((% is "Action" syntax tree) and %ACTION_UPGRADES.%ver.(%.stub)):
return (call %ACTION_UPGRADES.%ver.(%.stub) with [%])
if %UPGRADES.%ver:
%tree = (call %UPGRADES.%ver with [%tree])
return %tree
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
parse [%tree upgraded from %start_version] as (..)
%tree upgraded from %start_version to (Nomsu version)
parse [%tree upgraded to %end_version] as (..)
%tree upgraded from (%tree.version or (Nomsu version)) to %end_version
parse [%tree upgraded] as (..)
%tree upgraded from (%tree.version or (Nomsu version)) to (Nomsu version)
action [use %path from version %version]:
for file %filename in %path:
if (=lua "LOADED[\%filename]"): do next %filename
%file = (read file %filename)
%tree = (parse %file from %filename)
%tree = (upgrade %tree from %version)
run tree %tree
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