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Merge pull request #16 from evilsoft/pred-crock
Add Pred crock
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,61 @@ | ||
| /** @license ISC License (c) copyright 2016 original and current authors */ | ||
| /** @author Ian Hofmann-Hicks (evil) */ | ||
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| const isFunction = require('../internal/isFunction') | ||
| const isType = require('../internal/isType') | ||
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| const _inspect = require('../funcs/inspect') | ||
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| const constant = require('../combinators/constant') | ||
| const composeB = require('../combinators/composeB') | ||
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| const _type = | ||
| constant('Pred') | ||
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| const _empty = | ||
| () => Pred(constant(true)) | ||
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| function Pred(runWith) { | ||
| if(!isFunction(runWith)) { | ||
| throw new TypeError('Pred: Predicate function required') | ||
| } | ||
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| const type = | ||
| _type | ||
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| const inspect = | ||
| constant(`Pred${_inspect(runWith)}`) | ||
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| const empty = | ||
| _empty | ||
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| const value = | ||
| constant(runWith) | ||
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| function concat(m) { | ||
| if(!(m && isType(type(), m))) { | ||
| throw new TypeError('Pred.concat: Pred required') | ||
| } | ||
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| return Pred(x => runWith(x) && m.runWith(x)) | ||
| } | ||
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| function contramap(fn) { | ||
| if(!isFunction(fn)) { | ||
| throw new TypeError('Pred.contramap: Function required') | ||
| } | ||
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| return Pred(composeB(runWith, fn)) | ||
| } | ||
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| return { | ||
| runWith, inspect, type, | ||
| value, empty, concat, | ||
| contramap | ||
| } | ||
| } | ||
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| Pred.empty = _empty | ||
| Pred.type = _type | ||
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| module.exports = Pred |
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