pocomath/test/custom.mjs

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import assert from 'assert'
import math from '../src/pocomath.mjs'
import PocomathInstance from '../src/core/PocomathInstance.mjs'
import * as numbers from '../src/number/all.mjs'
import * as numberAdd from '../src/number/add.mjs'
import {add as genericAdd} from '../src/generic/arithmetic.mjs'
import * as complex from '../src/complex/all.mjs'
import * as complexAdd from '../src/complex/add.mjs'
import * as complexNegate from '../src/complex/negate.mjs'
import * as complexComplex from '../src/complex/complex.mjs'
import * as bigintAdd from '../src/bigint/add.mjs'
import * as concreteSubtract from '../src/generic/subtract.concrete.mjs'
import * as genericSubtract from '../src/generic/subtract.mjs'
import extendToComplex from '../src/complex/extendToComplex.mjs'
const bw = new PocomathInstance('backwards')
describe('A custom instance', () => {
it("works when partially assembled", () => {
bw.install(complex)
// Not much we can call without any number types:
const i3 = {re: 0, im: 3}
assert.deepStrictEqual(bw.complex(0, 3), i3)
assert.deepStrictEqual(bw.chain(0).complex(3).value, i3)
// Don't have a way to negate things, for example:
assert.throws(() => bw.negate(2), TypeError)
})
it("can be assembled in any order", () => {
bw.install(numbers)
bw.installType('string', {test: s => typeof s === 'string'})
assert.strictEqual(bw.subtract(16, bw.add(3,4,2)), 7)
assert.strictEqual(bw.negate('8'), -8)
assert.deepStrictEqual(bw.add(bw.complex(1,3), 1), {re: 2, im: 3})
assert.deepStrictEqual(
bw.subtract(16, bw.add(3, bw.complex(0,4), 2)),
math.complex(11, -4)) // note both instances coexist
assert.deepStrictEqual(bw.negate(math.complex(3, '8')).im, -8)
})
it("can be assembled piecemeal", () => {
const pm = new PocomathInstance('piecemeal')
pm.install(numbers)
assert.strictEqual(pm.subtract(5, 10), -5)
assert.strictEqual(pm.floor(3.7), 3)
assert.throws(() => pm.floor(10n), TypeError)
assert.strictEqual(pm.chain(5).add(7).value, 12)
pm.install(complexAdd)
pm.install(complexNegate)
pm.install(complexComplex)
// Should be enough to allow complex subtraction, as subtract is generic:
assert.deepStrictEqual(
pm.subtract(pm.complex(5, 0), pm.complex(10, 1)),
math.complex(-5, -1))
// And now floor has been activated for Complex as well, since the type
// is present
assert.deepStrictEqual(
pm.floor(math.complex(1.9, 0)),
math.complex(1))
// And the chain functions refresh themselves:
assert.deepStrictEqual(
pm.chain(5).add(pm.chain(0).complex(7).value).value, math.complex(5,7))
})
it("can defer definition of (even used) types", () => {
const dt = new PocomathInstance('Deferred Types')
dt.install(numberAdd)
dt.install({times: {
'number,number': () => (m,n) => m*n,
'Complex,Complex': ({complex}) => (w,z) => {
return complex(w.re*z.re - w.im*z.im, w.re*z.im + w.im*z.re)
}
}})
// complex type not present but should still be able to add numbers:
assert.strictEqual(dt.times(3,5), 15)
dt.install(complexComplex)
// times should now rebundle to allow complex:
assert.deepStrictEqual(
dt.times(dt.complex(2,3), dt.complex(2,-3)), dt.complex(13))
})
it("can selectively import in cute ways", async function () {
const cherry = new PocomathInstance('cherry')
cherry.install(numberAdd)
await extendToComplex(cherry)
cherry.install({add: genericAdd})
/* Now we have an instance that supports addition for number and complex
and little else:
*/
assert.strictEqual(cherry.add(3, 4, 2), 9)
assert.deepStrictEqual(
cherry.add(cherry.complex(3, 3), 4, cherry.complex(2, 2)),
math.complex(9,5))
assert.strictEqual('subtract' in cherry, false)
assert.strictEqual('negate' in cherry, false)
})
it("can use bundles that are closed under dependency", () => {
const ok = new PocomathInstance('concrete')
ok.install(concreteSubtract)
assert.strictEqual(ok.subtract(7, 5), 2)
})
it("can load generics and then import their dependences", async function () {
const chase = new PocomathInstance('Chase Dependencies')
chase.install(genericSubtract)
chase.install(complexComplex) // for convenience to build complex numbers
await chase.importDependencies(['bigint', 'complex'])
/* Now we have an instance that supports subtraction for Gaussian
integers.
*/
assert.deepStrictEqual(
chase.subtract(chase.complex(3n, 2n), chase.complex(2n, 5n)),
math.complex(1n, -3n))
})
it("instantiates templates correctly", () => {
const inst = new PocomathInstance('InstantiateTemplates')
inst.install(numberAdd)
inst.install({typeMerge: {'T,T': ({T}) => (t,u) => 'Merge to ' + T }})
assert.strictEqual(inst.typeMerge(7,6.28), 'Merge to number')
assert.strictEqual(inst.typeMerge(7,6), 'Merge to NumInt')
assert.strictEqual(inst.typeMerge(7.35,6), 'Merge to number')
inst.install(complexAdd)
inst.install(complexComplex)
inst.install(bigintAdd)
assert.strictEqual(
inst.typeMerge(6n, inst.complex(3n, 2n)),
'Merge to GaussianInteger')
assert.strictEqual(
inst.typeMerge(3, inst.complex(4.5,2.1)),
'Merge to Complex')
// The following is the current behavior, since 3 converts to 3+0i
// and 3n converts to 3n+0ni, both of which are technically Complex.
// This will remain the case even with templated Complex, because
// both Complex<bigint> and Complex<NumInt> will refine Complex (for the
// sake of catching new specializations). Not sure whether that will be
// OK or a problem that will have to be dealt with.
assert.strictEqual(inst.typeMerge(3, 3n), 'Merge to Complex')
// But types that truly cannot be merged should throw a TypeError
// Should add a variation of this with a more usual type once there is
// one not interconvertible with others...
inst.install(genericSubtract)
assert.throws(() => inst.typeMerge(3, undefined), TypeError)
})
})