feat: implicit convert BooleanT to NumberT

Also adds implicit conversion configuration option to Type constructor,
  and institutes a numbers-only bundle, and supports argument matching
  with implicit conversions.

  Still need to test that a behavior that invokes implicit conversion ends up
  with the conversion operation as a dependency (and so regenerates itself if
  the conversion changes).

src/__test__/numbers.spec.js

@@ -0,0 +1,9 @@
+import assert from 'assert'
+import math from '../numbers.js'
+
+describe('the numbers-only bundle', () => {
+   it('works like regular on number-only functions', () => {
+      assert.strictEqual(math.quotient(5, 3), 1)
+      assert.strictEqual(math.square(-3), 9)
+   })
+})

src/boolean/__test__/BooleanT.spec.js

@@ -0,0 +1,24 @@
+import assert from 'assert'
+import {BooleanT} from '../BooleanT.js'
+import math from '#nanomath'
+
+describe('BooleanT Type', () => {
+   it('correctly recognizes booleans', () => {
+      assert(BooleanT.test(true))
+      assert(BooleanT.test(false))
+      assert(!BooleanT.test(null))
+      assert(!BooleanT.test(1))
+   })
+   it('autoconverts to number type', () => {
+      assert.strictEqual(math.abs(false), 0)
+      assert.strictEqual(math.absquare(true), 1)
+      assert.strictEqual(math.add(true, true), 2)
+      assert.strictEqual(math.divide(false, true), 0)
+      assert.strictEqual(math.cbrt(true), 1)
+      assert.strictEqual(math.invert(true), 1)
+      assert.strictEqual(math.multiply(false, false), 0)
+      assert.strictEqual(math.negate(false), -0)
+      assert.strictEqual(math.subtract(false, true), -1)
+      assert.strictEqual(math.quotient(true, true), 1)
+   })
+})

src/boolean/all.js

@@ -0,0 +1 @@
+export * as typeDefinition from './BooleanT.js'

src/core/Type.js

@@ -5,8 +5,7 @@ export const types = () => typeObject
 export class Type {
    constructor(f, options = {}) {
       this.test = f
-      this.from = options.from ?? []
-      this.from.push(this)
+      this.from = new Map(options.from ?? [])
    }
    toString() {
       return this.name || `[Type ${this.test}]`

src/core/TypeDispatcher.js

@@ -7,17 +7,6 @@ import {
    alwaysMatches, matched, needsCollection, Any, Multiple
 } from './TypePatterns.js'
 
-// helper that organizes a list into the same chunks as a pattern is
-// NOTE NOTE: need to update to handle conversions!
-const collectLike = (list, pattern, state = {pos: 0}) => {
-   const result = []
-   for (const elt of pattern) {
-      if (Array.isArray(elt)) result.push(collectLike(list, elt, state))
-      else result.push(list[state.pos++])
-   }
-   return result
-}
-
 export class TypeDispatcher {
    constructor(...specs) {
       this._implementations = {} // maps key to list of [pattern, result] pairs
@@ -150,6 +139,26 @@ export class TypeDispatcher {
       for (const pair of this.resolve._genDepsOf) depSet.add(pair)
    }
 
+   // produces and returns a function that takes a list of arguments and
+   // transforms them per the given template, to massage them into the form
+   // expected by a behavior associated with the TypePattern that produced
+   // the template.
+   _generateCollectFunction(template, state = {pos: 0}) {
+      const extractors = []
+      for (const elt of template) {
+         if (Array.isArray(elt)) {
+            extractors.push(this._generateCollectFunction(elt, state))
+         } else {
+            const from = state.pos++
+            if ('actual' in elt) { // incorporate conversion
+               const convert = elt.matched.from.get(elt.actual)(this)
+               extractors.push(args => convert(args[from]))
+            } else extractors.push(args => args[from])
+         }
+      }
+      return args => extractors.map(f => f(args))
+   }
+
    resolve(key, types) {
       if (!(key in this)) {
          throw new ReferenceError(`no method or value for key '${key}'`)
@@ -200,6 +209,8 @@ export class TypeDispatcher {
          theBehavior = item(
             DependencyRecorder(this, [], this), matched(template))
       } catch {
+         // Oops, didn't work as a factory, so guess we were wrong.
+         // Just make it the direct value for this key on these types:
          behave.set(types, item)
          return item
       } finally {
@@ -210,12 +221,15 @@ export class TypeDispatcher {
           && needsCollection(template)
       ) {
          // have to wrap the behavior to collect the actual arguments
-         // in the way corresponding to the template
-         const wrappedBehavior = (...args) => {
-            const collectedArgs = collectLike(args, template)
-            return theBehavior(...collectedArgs)
+         // in the way corresponding to the template. That may generate
+         // more dependencies:
+         this.resolve._genDepsOf.push([key, types])
+         try {
+            const collectFunction = this._generateCollectFunction(template)
+            theBehavior = (...args) => theBehavior(...collectFunction(args))
+         } finally {
+            this.resolve._genDepsOf.pop()
          }
-         theBehavior = wrappedBehavior
       }
       behave.set(types, theBehavior)
       return theBehavior

src/core/TypePatterns.js

@@ -17,15 +17,12 @@ class MatchTypePattern extends TypePattern {
    }
    match(typeSequence, options={}) {
       const position = options.position ?? 0
-      const allowed = options.convert ? this.type.from : [this.type]
-      if (position < typeSequence.length
-          && allowed.includes(typeSequence[position])
-      ) {
-         let templateItem = typeSequence[position]
-         if (templateItem !== this.type) {
-            templateItem = {actual: templateItem, matched: this.type}
+      const actual = typeSequence[position]
+      if (position < typeSequence.length) {
+         if (actual === this.type) return [position + 1, actual]
+         if (options.convert && this.type.from.has(actual)) {
+            return [position + 1, {actual, matched: this.type}]
          }
-         return [position + 1, typeSequence[position]]
       }
       return [-1, Undefined]
    }

src/core/__test__/TypeDispatcher.spec.js

@@ -1,7 +1,7 @@
 import assert from 'assert'
 import {TypeDispatcher} from '../TypeDispatcher.js'
-import {numbers} from '../../numbers.js'
-import {generics} from '../../generics.js'
+import * as numbers from '#number/all.js'
+import * as generics from '#generic/all.js'
 import {onType} from "#core/helpers.js"
 import {Any} from "#core/TypePatterns.js"
 import {Returns} from "#core/Type.js"

src/generics.js

@@ -1 +0,0 @@
-export * as generics from './generic/all.js'

src/nanomath.js

@@ -1,7 +1,8 @@
-import {generics} from './generics.js'
-import {numbers} from './numbers.js'
+import * as booleans from './boolean/all.js'
+import * as generics from './generic/all.js'
+import * as numbers from './number/all.js'
 import {TypeDispatcher} from '#core/TypeDispatcher.js'
 
-const math = new TypeDispatcher(generics, numbers)
+const math = new TypeDispatcher(booleans, generics, numbers)
 
 export default math

src/number/NumberT.js

@@ -2,5 +2,5 @@ import {Type} from '#core/Type.js'
 import {BooleanT} from '#boolean/BooleanT.js'
 
 export const NumberT = new Type(n => typeof n === 'number', {
-    from: [BooleanT]
+    from: [[BooleanT, math => math.number.resolve([BooleanT])]],
 })

src/number/__test__/NumberT.spec.js

@@ -1,5 +1,7 @@
 import assert from 'assert'
 import {NumberT} from '../NumberT.js'
+import {BooleanT} from '#boolean/BooleanT.js'
+import math from '#nanomath'
 
 describe('NumberT Type', () => {
    it('correctly recognizes numbers', () => {
@@ -8,4 +10,10 @@ describe('NumberT Type', () => {
       assert(NumberT.test(Infinity))
       assert(!NumberT.test("3"))
    })
+
+   it('can convert from BooleanT to NumberT', () => {
+      const cnvBtoN = NumberT.from.get(BooleanT)(math)
+      assert.strictEqual(cnvBtoN(true), 1)
+      assert.strictEqual(cnvBtoN(false), 0)
+   })
 })

src/number/__test__/type.spec.js

@@ -4,5 +4,7 @@ import math from '#nanomath'
 describe('number type operations', () => {
    it('converts to number', () => {
       assert.strictEqual(math.number(2.637), 2.637)
+      assert.strictEqual(math.number(true), 1)
+      assert.strictEqual(math.number(false), 0)
    })
 })

src/numbers.js

@@ -1 +1,7 @@
-export * as numbers from './number/all.js'
+import * as numbers from './number/all.js'
+import * as generics from './generic/all.js'
+import {TypeDispatcher} from '#core/TypeDispatcher.js'
+
+const math = new TypeDispatcher(numbers, generics)
+
+export default math

src/package.json

@@ -3,6 +3,7 @@
         "#nanomath": "./nanomath.js",
         "#boolean/*.js": "./boolean/*.js",
         "#core/*.js": "./core/*.js",
+        "#generic/*.js": "./generic/*.js",
         "#number/*.js": "./number/*.js"
     },
     "type" : "module"