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import Op, Action, FnDef from require 'core.base'
local Scope
load_ = ->
import Scope from require 'core.scope'
ancestor = (klass) ->
assert klass, "cant find the ancestor of nil"
while klass.__parent
klass = klass.__parent
klass
class Ref
new: (@original) =>
get: (...) => @original\get ...
getc: (...) => @original\get ...
destroy: =>
update: =>
class Const
types = {
sym: true
str: true
num: true
bool: true
scope: true
op: true
opdef: true
fndef: true
builtin: true
}
new: (@type, @value, @raw) =>
assert types[@type], "invalid Const type: #{@type}"
-- Value interface
get: (type) =>
assert not type or type == @type, "#{@} is not a #{type}"
@value
getc: (type) =>
assert not type or type == @type, "#{@} is not a #{type}"
@value
update: (dt) =>
switch @type
when 'op'
@value\update dt
-- AST interface
eval: (scope) =>
switch @type
when 'num', 'str'
@
when 'sym'
assert (scope\get @value), "undefined reference to symbol '#{@value}'"
else
error "cannot evaluate #{@}"
quote: => @
stringify: => @raw
clone: (prefix) => @
-- in case of doubt:
-- clone: (prefix) => Const @type, @value, @raw
-- static
__tostring: =>
value = if @type == 'opdef' or @type == 'builtin' then @value.__name else @value
"<#{@type}: #{value}>"
__eq: (other) =>
other.type == @type and other.value == @value
unescape = (str) -> str\gsub '\\([\'"\\])', '%1'
@parse: (type, sep) =>
switch type
when 'num' then (match) -> @ 'num', (tonumber match), match
when 'sym' then (match) -> @ 'sym', match, match
when 'str' then (match) -> @ 'str', (unescape match), sep .. match .. sep
@num: (num) -> Const 'num', num, tostring num
@str: (str) -> Const 'str', str, "'#{str}'"
@sym: (sym) -> Const 'sym', sym, sym
@bool: (bool) -> Const 'bool', bool, tostring bool
@empty: -> Const 'str', '', "''"
@wrap: (val, name='(unknown)') ->
typ = switch type val
when 'number' then 'num'
when 'string' then 'str'
when 'table'
if base = rawget val, '__base'
-- a class
switch ancestor val
when Op then 'opdef'
when Action then 'builtin'
else
error "#{name}: cannot wrap class '#{val.__name}'"
elseif val.__class
-- an instance
switch ancestor val.__class
when Op then 'op'
when Scope then 'scope'
when FnDef then 'fndef'
when Const
return val
else
error "#{name}: cannot wrap '#{val.__class.__name}' instance"
else
-- plain table
return Const 'scope', Scope.from_table val
else
error "#{name}: cannot wrap Lua type '#{type val}'"
Const typ, val
@wrap_ref: (val) ->
if base = rawget val, '__base'
-- a class
error "#{name}: cannot wrap_ref class '#{val.__name}'"
elseif val.__class
-- an instance
switch ancestor val.__class
when Op then Ref val
when Const then val
else
error "#{name}: cannot wrap_ref '#{val.__class.__name}' instance"
else
error "#{name}: cannot wrap_ref Lua type '#{type val}'"
:Const, :load_
|
