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Étienne Reuh Fildadut
e71bff9562
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.
40 lines
1.2 KiB
Lua
40 lines
1.2 KiB
Lua
local primary = require("parser.expression.primary.primary")
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local type_check = require("parser.expression.secondary.infix.type_check")
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local identifier = require("parser.expression.primary.identifier")
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local ast = require("ast")
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local Nil = ast.Nil
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return primary {
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match = function(self, str)
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if str:match("^%::?[&@]?") then
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return identifier:match(str:match("^%::?[&@]?(.-)$"))
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end
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return false
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end,
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parse = function(self, source, str)
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local mod_const, mod_export, rem = source:consume(str:match("^(%:(:?)([&@]?))(.-)$"))
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local constant, alias, type_check_exp, exported
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-- get modifier
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if mod_const == ":" then constant = true end
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if mod_export == "&" then alias = true
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elseif mod_export == "@" then exported = true end
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-- name
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local ident
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ident, rem = identifier:parse(source, rem)
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-- type check
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local nil_val = Nil:new()
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if type_check:match(rem, 0, nil_val) then
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local exp
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exp, rem = type_check:parse(source, rem, nil, 0, nil_val)
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type_check_exp = exp.arguments.positional[2]
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end
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return ident:to_symbol{ constant = constant, alias = alias, exported = exported, type_check = type_check_exp }:set_source(source), rem
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end
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}
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