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Replace persistent variable system

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Previous system linked the variable name with the saved value, meaning the variable could not be renamed or moved outside the global scope.

Instead we propose to store all persistent values in a global table, identifying each by a key. To still allow nice manipulation with identifiers, the alias syntax replace the persistent syntax for symbols - an aliases symbol will act as if a function call was used in place of the identifier when it appear.
This commit is contained in:
Étienne Fildadut 2023-12-27 21:25:14 +01:00
parent 56ed6c912b
commit e71bff9562
13 changed files with 169 additions and 58 deletions
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6
parser/expression/primary/symbol.lua
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@ -16,11 +16,11 @@ return primary {
parse = function(self, source, str)
local mod_const, mod_export, rem = source:consume(str:match("^(%:(:?)([&@]?))(.-)$"))
local constant, persistent, type_check_exp, exported
local constant, alias, type_check_exp, exported
-- get modifier
if mod_const == ":" then constant = true end
if mod_export == "&" then persistent = true
if mod_export == "&" then alias = true
elseif mod_export == "@" then exported = true end
-- name
@ -35,6 +35,6 @@ return primary {
type_check_exp = exp.arguments.positional[2]
end
return ident:to_symbol{ constant = constant, persistent = persistent, exported = exported, type_check = type_check_exp }:set_source(source), rem
return ident:to_symbol{ constant = constant, alias = alias, exported = exported, type_check = type_check_exp }:set_source(source), rem
end
}