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import Array, Op, PureOp, Builtin, Constant, Error, const, sig, evt, T from require 'alv.base'
import Cell from require 'alv.cell'
import Tag from require 'alv.tag'
builtins = require 'alv.builtins'
unpack or= table.unpack
any = sig! / evt!
get = Constant.meta
meta:
name: 'get'
summary: "Index into an array."
examples: { '(get array i)' }
description: "Get the value at index `i` (starting at 0).
`i` has to be a constant expression."
value: class extends PureOp
pattern: any + const.num
type: (inputs) =>
{ array, i } = inputs
array\type!\get i.result!
tick: =>
{ array, i } = @unwrap_all!
@out\set array[i + 1]
set = Constant.meta
meta:
name: 'set'
summary: "Update a value in an array."
examples: { '(set array i val)' }
description: "Set the value for `i` to `val`.
`i` has to be a constant expression. This is a pure op, so at most one of
`array` and `val` may be a !-stream."
value: class extends PureOp
pattern: any + const.num + any
type: (inputs) =>
{ array, i, val } = inputs
type = array\type!
expected = type\get i.result!
if expected ~= val\type!
msg = string.format "expected value of type %s, not %s",
expected, val\type!
error Error 'argument', msg
type
tick: =>
{ array, key, val } = @unwrap_all!
array = [v for v in *array]
array[key + 1] = val
@out\set array
head = Constant.meta
meta:
name: 'head'
summary: "Get the first element from an array."
examples: { '(head array)' }
value: class extends PureOp
pattern: any*1
type: (inputs) =>
type = inputs[1]\type!
assert type.__class == Array, Error 'argument', "expected an Array"
assert type.size > 0, Error 'argument', "cannot get head of empty Array"
type.type
tick: =>
{ array } = @unwrap_all!
@out\set array[1]
tail = Constant.meta
meta:
name: 'tail'
summary: "Get everything except the first element from an array."
examples: { '(tail array)' }
value: class extends PureOp
pattern: any*1
type: (inputs) =>
type = inputs[1]\type!
assert type.__class == Array, Error 'argument', "expected an Array"
assert type.size > 0, Error 'argument', "cannot get tail of empty Array"
Array type.size - 1, type.type
tick: =>
{ array } = @unwrap_all!
@out\set [v for v in *array[2,]]
prepend = Constant.meta
meta:
name: 'prepend'
summary: "Prepend a new value at the start of an array."
examples: { '(prepend array val)' }
description: "Prepend `val` to `array` at index `0`, moving other values back.
This is a pure op, so at most one of `array` and `val` may be a !-stream."
value: class extends PureOp
pattern: any + any
type: (inputs) =>
{ array, val } = inputs
type = array\type!
if val\type! ~= type.type
msg = string.format "expected value of type %s, not %s",
type.type, val\type!
error Error 'argument', msg
Array type.size + 1, type.type
tick: =>
{ array, val } = @unwrap_all!
array = [v for v in *array]
table.insert array, 1, val
@out\set array
insert = Constant.meta
meta:
name: 'insert'
summary: "Insert a new value into an array."
examples: { '(insert array i val)' }
description: "Insert `val` into `array` at `i`, moving other values back if
necessary.
`i` has to be a constant expression. This is a pure op, so at most one of
`array` and `val` may be a !-stream."
value: class extends PureOp
pattern: any + const.num + any
type: (inputs) =>
{ array, i, val } = inputs
type = array\type!
i = i.result!
if i > type.size or i < 0
error Error 'argument', "index '#{i}' out of range!"
if val\type! ~= type.type
msg = string.format "expected value of type %s, not %s",
type.type, val\type!
error Error 'argument', msg
Array type.size + 1, type.type
tick: =>
{ array, i, val } = @unwrap_all!
array = [v for v in *array]
table.insert array, i + 1, val
@out\set array
remove = Constant.meta
meta:
name: 'remove'
summary: "Remove a value from an Array."
examples: { '(remove array i)' }
description: "Removes the value at index `i` from `array`.
`i` has to be a constant expression."
value: class extends PureOp
pattern: any + const.num
type: (inputs) =>
{ array, i } = inputs
type = array\type!
-- check index range
type\get i.result!
Array type.size - 1, type.type
tick: =>
{ array, i, val } = @unwrap_all!
array = [v for v in *array]
table.remove array, i + 1
@out\set array
size = Constant.meta
meta:
name: 'size'
summary: "Get the size of an array."
examples: { '(size array)' }
value: class extends Op
setup: (inputs) =>
super {}
assert #inputs == 1, Error 'argument', "expected exactly one argument"
type = inputs[1]\type!
assert type.__class == Array, Error 'argument', "expected an Array"
@out = Constant.num type.size
concat = Constant.meta
meta:
name: 'concat'
summary: "Concatenate Arrays."
examples: { '(concat arr1 arr2 [arr3…])' }
value: class extends PureOp
pattern: any\rep 2
type: (inputs) =>
size = 0
type = inputs[1]\type!.type
for input in *inputs
array = input\type!
if array.type ~= type
msg = string.format "Cannot concatenate different arrays %s, %s",
inputs[1]\type!, array
error Error 'argument', msg
size += array.size
Array size, type
tick: =>
arrays = @unwrap_all!
out = {}
for array in *arrays
for val in *array
table.insert out, val
@out\set out
array_constr = builtins!\get('array').result
map = Constant.meta
meta:
name: 'map'
summary: "Apply an function to each value in an array."
examples: { '(map array fn)' }
description: "
Invokes `fn` once for each element in `array` and returns an array of the results.
`fn` must take one argument and return the same type consistently."
value: class extends Builtin
eval: (scope, tail) =>
L\trace "evaling #{@}"
assert #tail == 2, "'map' takes exactly two arguments"
tail = [L\push t\eval, scope for t in *tail]
{ array, fn } = tail
fndef = fn.result
assert fn\type! == T.fndef, "fn has to be a fndef"
array_type = array\type!
assert array_type.__class == Array, Error 'argument', "expected an Array"
invocations = for i=1, array_type.size
tag_o = @tag\clone Tag.parse tostring i
tag_i = @tag\clone tag_o
Cell tag_o, {
with Constant.literal T.fndef, fndef!, 'fn'
.meta = fndef.meta
Cell tag_i, {
Constant.literal T.opdef, get!, 'get'
Constant.literal array_type, array.result!, 'array'
Constant.num i-1
}
}
tag = @tag\clone Tag.parse '-1'
inner = Cell tag, {
Constant.literal T.opdef, array_constr, 'array'
unpack invocations
}
super inner\eval scope
Constant.meta
meta:
name: 'array'
summary: "Utilities for dealing with arrays."
value:
:get, :set
:head, :tail, :prepend
:insert, :remove
:map
:size, :concat
|
