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import PureOp, Constant, T, sig, evt from require 'alv.base'
all_same = (first, list) ->
for v in *list
if v != first
return false
first
tobool = (val) ->
switch val
when false, nil, 0
false
else
true
any = sig! / evt!
class ReduceOp extends PureOp
pattern: any\rep 2, nil
type: T.bool
tick: =>
args = @unwrap_all!
accum = tobool args[1]
for val in *args[2,]
accum = @.fn accum, tobool val
@out\set accum
eq = Constant.meta
meta:
name: 'eq'
summary: "Check for equality."
examples: { '(== a b [c]…)', '(eq a b [c]…)' }
description: "`true` if the types and values of all arguments are equal."
value: class extends ReduceOp
setup: (inputs) =>
@state or= {}
@state.same_type = all_same inputs[1]\type!, [i\type! for i in *inputs[2,]]
super inputs
tick: =>
if not @state.same_type
@out\set false
return
typ = @inputs[1]\type!
args = @unwrap_all!
equal, first = true, args[1]
for other in *args[2,]
if not typ\eq first, other
equal = false
break
@out\set equal
not_eq = Constant.meta
meta:
name: 'not-eq'
summary: "Check for inequality."
examples: { '(!= a b [c]…)', '(not-eq a b [c]…)' }
description: "`true` if types or values of any two arguments are different."
value: class extends ReduceOp
setup: (inputs) =>
@state or= {}
@state.same_type = all_same inputs[1]\type!, [i\type! for i in *inputs[2,]]
super inputs
tick: =>
if not @state.same_type
@out\set true
return
typ = @inputs[1]\type!
args = @unwrap_all!
diff, first = true, args[1]
for other in *args[2,]
if typ\eq first, other
diff = false
break
@out\set diff
and_ = Constant.meta
meta:
name: 'and'
summary: "Logical AND."
examples: { '(and a b [c…])' }
value: class extends ReduceOp
fn: (a, b) -> a and b
or_ = Constant.meta
meta:
name: 'or'
summary: "Logical OR."
examples: { '(or a b [c…])' }
value: class extends ReduceOp
fn: (a, b) -> a or b
not_ = Constant.meta
meta:
name: 'not'
summary: "Logical NOT."
examples: { '(not a)' }
value: class extends PureOp
pattern: any\rep 1, 1
type: T.bool
tick: => @out\set not tobool @inputs[1]!
bool = Constant.meta
meta:
name: 'bool'
summary: "Cast value to bool."
examples: { '(bool a)' }
description: "`false` if a is `false`, `nil` or `0`, `true` otherwise."
value: class extends PureOp
pattern: any\rep 1, 1
type: T.bool
tick: => @out\set tobool @inputs[1]!
Constant.meta
meta:
name: 'logic'
summary: "Logical operations."
value:
:eq, '==': eq
'not-eq': not_eq, '!=': not_eq
and: and_
or: or_
not: not_
:bool
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