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import do_setup from require 'spec.test_setup'
import Cell, RootCell from require 'alv.cell'
import Constant, Scope, Tag, SimpleRegistry, globals from require 'alv'
setup do_setup
hello_world = Cell.parse Tag.parse('2'), {
'', (Constant.sym 'hello'), ' ', (Constant.str 'world'), ''
}
two_plus_two = Cell.parse Tag.parse('3'), {
'', (Constant.sym '+'), ' ', (Constant.num 2), ' ', (Constant.num 2), ''
}
describe 'Cell', ->
describe 'when cloned', ->
parent = Tag.blank '1'
with hello_world\clone parent
it 'keeps children', ->
assert.is.equal Cell, .__class
assert.is.equal (Constant.sym 'hello'), \head!
assert.is.same { Constant.str 'world' }, \tail!
it 'clones the tag', ->
assert.is.equal hello_world.tag, .tag.original
assert.is.equal parent, .tag.parent
describe 'when evaluated', ->
it 'errors when empty', ->
cell = Cell.parse {''}
assert.has.error -> cell\eval globals
it 'evaluates its head', ->
head = Constant.sym 'trace'
cell = Cell.parse { '', head, ' ', (Constant.sym 'true'), '' }
s = spy.on head, 'eval'
cell\eval globals
assert.spy(s).was_called_with (match.is_ref head), (match.is_ref globals)
describe 'RootCell', ->
test 'tag is always [0]', ->
cell = Cell.parse_root {}
assert.is.equal '[0]', cell.tag\stringify!
test 'head is always "do"', ->
cell = Cell.parse_root {}
assert.is.equal (Constant.sym 'do'), cell\head!
cell = RootCell nil, { hello_world, two_plus_two }
assert.is.equal (Constant.sym 'do'), cell\head!
test 'tail is all children', ->
cell = Cell.parse_root {}
assert.is.same {}, cell\tail!
cell = RootCell nil, { hello_world, two_plus_two }
assert.is.same { hello_world, two_plus_two },
cell\tail!
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