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Add scoped functions

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This commit is contained in:
Étienne Fildadut 2021-12-10 23:22:06 +01:00
parent 3d32f35d67
commit fef498b3d7
16 changed files with 1164 additions and 58 deletions
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54
interpreter/common.lua
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@ -58,9 +58,7 @@ common = {
mt.cache = {}
-- merge modified re-assigned variables
for var, value in pairs(state.variables) do
if common.should_keep_variable(state, var) then
global.variables[var] = value
end
global.variables[var] = value
state.variables[var] = nil
end
end,
@ -81,16 +79,62 @@ common = {
return var
end
end,
--- set the value of a variable
set_variable = function(state, name, val)
state.variables[name] = val
end,
--- handle scoped function
scope = {
push = function(self, state, fn)
local scoped = getmetatable(state.variables).scoped
if not fn.scoped then error("trying to push a scope for a non-scoped function") end
-- add scope
if not scoped[fn] then
scoped[fn] = {}
end
local last_scope = scoped[fn][#scoped[fn]]
local fn_scope = {}
table.insert(scoped[fn], fn_scope)
-- add scoped variables to scope
for _, name in ipairs(fn.scoped) do
-- preserve current values in last scope
if last_scope then
last_scope[name] = state.variables[name]
end
-- set last value to nil to force to copy again from global variables in new scope
state.variables[name] = nil
local value = state.variables[name]
fn_scope[name] = value
end
end,
pop = function(self, state, fn)
local scoped = getmetatable(state.variables).scoped
if not scoped[fn] then error("trying to pop a scope without any pushed scope") end
-- remove current scope
table.remove(scoped[fn])
-- set scopped variables to previous scope
local last_scope = scoped[fn][#scoped[fn]]
if last_scope then
for _, name in ipairs(fn.scoped) do
state.variables[name] = last_scope[name]
end
else -- no previous scope
for _, name in ipairs(fn.scoped) do
state.variables[name] = nil
end
-- no need to remove this I think, there's not going to be a million different functions in a single game so we can keep the tables
-- (anselme's performance is already bad enough, let's not create tables at each function call...)
-- scoped[fn] = nil
end
end
},
--- mark a table as modified, so it will be merged on the next checkpoint if it appears somewhere in a value
mark_as_modified = function(state, v)
local modified = getmetatable(state.variables).modified_tables
table.insert(modified, v)
end,
--- returns true if a variable should be persisted on save/merge
-- will exclude: undefined variables, variables in functions defined with parentheses, internal anselme variables
--- returns true if a variable should be persisted on save
-- will exclude: undefined variables, variables in scoped functions, internal anselme variables
should_keep_variable = function(state, name)
local v = state.variables[name]
return v.type ~= "undefined argument" and v.type ~= "pending definition" and name:match("^"..identifier_pattern.."$") and not name:match("^anselme%.")