#!/usr/bin/env nomsu -V4.8.10
#
    This file defines upgrades from Nomsu <2.4 to Nomsu 2.4

use "compatibility/compatibility.nom"

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

upgrade %tree to "2.4" as:
    unless (%tree is "Action" syntax tree): return
    if %tree.stub is:
        "when":
            %conditions = []
            %new_lines = []
            %body = (..)
                (%tree.2 upgraded) if (%tree.2 is "Block" syntax tree) else [%tree.2 upgraded]
            for %line in %body:
                when:
                    (not (%line is "Action" syntax tree)):
                        %new_lines::add %line
                    (%line.stub is "*"):
                        if ((size of %line) == 2):
                            %conditions::add %line.2
                        ..else:
                            %new_lines::add %line
                    (%line.stub == "* else"):
                        %new_lines::add (\(else %block) with vars {block:%line.3})
                    else:
                        %conditions::add %line.2
                        %action = %line.3
                        unless (%action is "Block" syntax tree):
                            %action = (=lua "Block(\%action.source, \%action)")
                        %conditions::add %action
                        %new_lines::add (=lua "Action(\%conditions[1].source, unpack(\%conditions))")
                        %conditions = []
            
            return (..)
                \(when %body) with vars {body:=lua "Block(\%tree[2].source, unpack(\%new_lines))"}
        
        "when 1 is ?" "when 1 = ?":
            %values = []
            %new_lines = []
            %body = (..)
                (%tree.5 upgraded) if (%tree.5 is "Block" syntax tree) else [%tree.5 upgraded]
            for %line in %body:
                when:
                    (not (%line is "Action" syntax tree)):
                        %new_lines::add %line
                    (%line.stub is "*"):
                        if ((size of %line) == 2):
                            %values::add %line.2
                        ..else:
                            %new_lines::add %line
                    (%line.stub == "* else"):
                        %new_lines::add (\(else %block) with vars {block:%line.3})
                    else:
                        %values::add %line.2
                        %action = %line.3
                        unless (%action is "Block" syntax tree):
                            %action = \(: %action)
                        %values::add %action
                        %new_lines::add (=lua "Action(\%values[1].source, unpack(\%values))")
                        %values = []
            
            return (..)
                \(if %var is %body) with vars {..}
                    var:%tree.2 upgraded, body:=lua "Block(\%tree[5].source, unpack(\%new_lines))"