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import Op, Value, Input, Error, match from require 'core.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
class ReduceOp extends Op
new: => super 'bool'
setup: (inputs) =>
{ first, rest } = match "any *any", inputs
super
first: Input.value first
rest: [Input.value v for v in *rest]
tick: =>
{ :first, :rest } = @unwrap_all!
accum = tobool first
for val in *rest
accum = @.fn accum, tobool val
@out\set accum
eq = Value.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 Op
new: => super 'bool', false
setup: (inputs) =>
{ first, rest } = match "any *any", inputs
same = all_same first\type!, [i\type! for i in *rest]
super if same
{
first: Input.value first
rest: [Input.value v for v in *rest]
}
else
{}
tick: =>
if not @inputs.first
@out\set false
return
{ :first, :rest } = @unwrap_all!
equal = true
for other in *rest
if first != other
equal = false
break
@out\set equal
not_eq = Value.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 Op
new: => super 'bool'
setup: (inputs) =>
assert #inputs > 1, Error 'argument', "need at least two values"
super [Input.value v for v in *inputs]
tick: =>
if not @inputs[1]
@out\set true
return
diff = true
for a=1, #@inputs-1
for b=a+1, #@inputs
if @inputs[a].stream == @inputs[b].stream
diff = false
break
break unless diff
@out\set diff
and_ = Value.meta
meta:
name: 'and'
summary: "Logical AND."
examples: { '(and a b [c…])' }
value: class extends ReduceOp
fn: (a, b) -> a and b
or_ = Value.meta
meta:
name: 'or'
summary: "Logical OR."
examples: { '(or a b [c…])' }
value: class extends ReduceOp
fn: (a, b) -> a or b
not_ = Value.meta
meta:
name: 'not'
summary: "Logical NOT."
examples: { '(not a)' }
value: class extends Op
new: => super 'bool'
setup: (inputs) =>
{ value } = match 'any', inputs
super value: Input.value value
tick: => @out\set not tobool @inputs.value!
bool = Value.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 Op
new: => super 'bool'
setup: (inputs) =>
{ value } = match 'any', inputs
super value: Input.value value
tick: => @out\set tobool @inputs\value!
{
:eq, '==': eq
'not-eq': not_eq, '!=': not_eq
and: and_
or: or_
not: not_
:bool
}
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