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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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28
ast/Symbol.lua
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@ -11,8 +11,8 @@ Symbol = ast.abstract.Node {
constant = nil, -- bool
type_check = nil, -- exp
alias = nil, -- bool
exported = nil, -- bool
persistent = nil, -- bool, imply exported
confined_to_branch = nil, -- bool
@ -20,23 +20,29 @@ Symbol = ast.abstract.Node {
modifiers = modifiers or {}
self.string = str
self.constant = modifiers.constant
self.persistent = modifiers.persistent
self.type_check = modifiers.type_check
self.alias = modifiers.alias
self.confined_to_branch = modifiers.confined_to_branch
self.exported = modifiers.exported or modifiers.persistent
self.exported = modifiers.exported
if self.type_check then
self.format_priority = operator_priority["_::_"]
end
end,
_eval = function(self, state)
return Symbol:new(self.string, {
constant = self.constant,
persistent = self.persistent,
type_check = self.type_check and self.type_check:eval(state),
confined_to_branch = self.confined_to_branch,
exported = self.exported
})
return self:with {
type_check = self.type_check and self.type_check:eval(state)
}
end,
with = function(self, modifiers)
modifiers = modifiers or {}
for _, k in ipairs{"constant", "type_check", "alias", "exported", "confined_to_branch"} do
if modifiers[k] == nil then
modifiers[k] = self[k]
end
end
return Symbol:new(self.string, modifiers)
end,
_hash = function(self)
@ -48,7 +54,7 @@ Symbol = ast.abstract.Node {
if self.constant then
s = s .. ":"
end
if self.persistent then
if self.alias then
s = s .. "&"
end
if self.exported then