diff options
Diffstat (limited to 'src/data/composite/control-flow')
11 files changed, 367 insertions, 0 deletions
diff --git a/src/data/composite/control-flow/exitWithoutDependency.js b/src/data/composite/control-flow/exitWithoutDependency.js new file mode 100644 index 0000000..c660a7e --- /dev/null +++ b/src/data/composite/control-flow/exitWithoutDependency.js @@ -0,0 +1,35 @@ +// Early exits if a dependency isn't available. +// See withResultOfAvailabilityCheck for {mode} options. + +import {input, templateCompositeFrom} from '#composite'; + +import inputAvailabilityCheckMode from './inputAvailabilityCheckMode.js'; +import withResultOfAvailabilityCheck from './withResultOfAvailabilityCheck.js'; + +export default templateCompositeFrom({ + annotation: `exitWithoutDependency`, + + inputs: { + dependency: input({acceptsNull: true}), + mode: inputAvailabilityCheckMode(), + value: input({defaultValue: null}), + }, + + steps: () => [ + withResultOfAvailabilityCheck({ + from: input('dependency'), + mode: input('mode'), + }), + + { + dependencies: ['#availability', input('value')], + compute: (continuation, { + ['#availability']: availability, + [input('value')]: value, + }) => + (availability + ? continuation() + : continuation.exit(value)), + }, + ], +}); diff --git a/src/data/composite/control-flow/exitWithoutUpdateValue.js b/src/data/composite/control-flow/exitWithoutUpdateValue.js new file mode 100644 index 0000000..244b323 --- /dev/null +++ b/src/data/composite/control-flow/exitWithoutUpdateValue.js @@ -0,0 +1,24 @@ +// Early exits if this property's update value isn't available. +// See withResultOfAvailabilityCheck for {mode} options. + +import {input, templateCompositeFrom} from '#composite'; + +import exitWithoutDependency from './exitWithoutDependency.js'; +import inputAvailabilityCheckMode from './inputAvailabilityCheckMode.js'; + +export default templateCompositeFrom({ + annotation: `exitWithoutUpdateValue`, + + inputs: { + mode: inputAvailabilityCheckMode(), + value: input({defaultValue: null}), + }, + + steps: () => [ + exitWithoutDependency({ + dependency: input.updateValue(), + mode: input('mode'), + value: input('value'), + }), + ], +}); diff --git a/src/data/composite/control-flow/exposeConstant.js b/src/data/composite/control-flow/exposeConstant.js new file mode 100644 index 0000000..e76699c --- /dev/null +++ b/src/data/composite/control-flow/exposeConstant.js @@ -0,0 +1,26 @@ +// Exposes a constant value exactly as it is; like exposeDependency, this +// is typically the base of a composition serving as a particular property +// descriptor. It generally follows steps which will conditionally early +// exit with some other value, with the exposeConstant base serving as the +// fallback default value. + +import {input, templateCompositeFrom} from '#composite'; + +export default templateCompositeFrom({ + annotation: `exposeConstant`, + + compose: false, + + inputs: { + value: input.staticValue({acceptsNull: true}), + }, + + steps: () => [ + { + dependencies: [input('value')], + compute: ({ + [input('value')]: value, + }) => value, + }, + ], +}); diff --git a/src/data/composite/control-flow/exposeDependency.js b/src/data/composite/control-flow/exposeDependency.js new file mode 100644 index 0000000..3aa3d03 --- /dev/null +++ b/src/data/composite/control-flow/exposeDependency.js @@ -0,0 +1,28 @@ +// Exposes a dependency exactly as it is; this is typically the base of a +// composition which was created to serve as one property's descriptor. +// +// Please note that this *doesn't* verify that the dependency exists, so +// if you provide the wrong name or it hasn't been set by a previous +// compositional step, the property will be exposed as undefined instead +// of null. + +import {input, templateCompositeFrom} from '#composite'; + +export default templateCompositeFrom({ + annotation: `exposeDependency`, + + compose: false, + + inputs: { + dependency: input.staticDependency({acceptsNull: true}), + }, + + steps: () => [ + { + dependencies: [input('dependency')], + compute: ({ + [input('dependency')]: dependency + }) => dependency, + }, + ], +}); diff --git a/src/data/composite/control-flow/exposeDependencyOrContinue.js b/src/data/composite/control-flow/exposeDependencyOrContinue.js new file mode 100644 index 0000000..0f7f223 --- /dev/null +++ b/src/data/composite/control-flow/exposeDependencyOrContinue.js @@ -0,0 +1,34 @@ +// Exposes a dependency as it is, or continues if it's unavailable. +// See withResultOfAvailabilityCheck for {mode} options. + +import {input, templateCompositeFrom} from '#composite'; + +import inputAvailabilityCheckMode from './inputAvailabilityCheckMode.js'; +import withResultOfAvailabilityCheck from './withResultOfAvailabilityCheck.js'; + +export default templateCompositeFrom({ + annotation: `exposeDependencyOrContinue`, + + inputs: { + dependency: input({acceptsNull: true}), + mode: inputAvailabilityCheckMode(), + }, + + steps: () => [ + withResultOfAvailabilityCheck({ + from: input('dependency'), + mode: input('mode'), + }), + + { + dependencies: ['#availability', input('dependency')], + compute: (continuation, { + ['#availability']: availability, + [input('dependency')]: dependency, + }) => + (availability + ? continuation.exit(dependency) + : continuation()), + }, + ], +}); diff --git a/src/data/composite/control-flow/exposeUpdateValueOrContinue.js b/src/data/composite/control-flow/exposeUpdateValueOrContinue.js new file mode 100644 index 0000000..1f94b33 --- /dev/null +++ b/src/data/composite/control-flow/exposeUpdateValueOrContinue.js @@ -0,0 +1,40 @@ +// Exposes the update value of an {update: true} property as it is, +// or continues if it's unavailable. +// +// See withResultOfAvailabilityCheck for {mode} options. +// +// Provide {validate} here to conveniently set a custom validation check +// for this property's update value. +// + +import {input, templateCompositeFrom} from '#composite'; + +import exposeDependencyOrContinue from './exposeDependencyOrContinue.js'; +import inputAvailabilityCheckMode from './inputAvailabilityCheckMode.js'; + +export default templateCompositeFrom({ + annotation: `exposeUpdateValueOrContinue`, + + inputs: { + mode: inputAvailabilityCheckMode(), + + validate: input({ + type: 'function', + defaultValue: null, + }), + }, + + update: ({ + [input.staticValue('validate')]: validate, + }) => + (validate + ? {validate} + : {}), + + steps: () => [ + exposeDependencyOrContinue({ + dependency: input.updateValue(), + mode: input('mode'), + }), + ], +}); diff --git a/src/data/composite/control-flow/index.js b/src/data/composite/control-flow/index.js new file mode 100644 index 0000000..7fad88b --- /dev/null +++ b/src/data/composite/control-flow/index.js @@ -0,0 +1,14 @@ +// #composite/control-flow +// +// No entries depend on any other entries, except siblings in this directory. +// + +export {default as exitWithoutDependency} from './exitWithoutDependency.js'; +export {default as exitWithoutUpdateValue} from './exitWithoutUpdateValue.js'; +export {default as exposeConstant} from './exposeConstant.js'; +export {default as exposeDependency} from './exposeDependency.js'; +export {default as exposeDependencyOrContinue} from './exposeDependencyOrContinue.js'; +export {default as exposeUpdateValueOrContinue} from './exposeUpdateValueOrContinue.js'; +export {default as raiseOutputWithoutDependency} from './raiseOutputWithoutDependency.js'; +export {default as raiseOutputWithoutUpdateValue} from './raiseOutputWithoutUpdateValue.js'; +export {default as withResultOfAvailabilityCheck} from './withResultOfAvailabilityCheck.js'; diff --git a/src/data/composite/control-flow/inputAvailabilityCheckMode.js b/src/data/composite/control-flow/inputAvailabilityCheckMode.js new file mode 100644 index 0000000..8008fde --- /dev/null +++ b/src/data/composite/control-flow/inputAvailabilityCheckMode.js @@ -0,0 +1,9 @@ +import {input} from '#composite'; +import {is} from '#validators'; + +export default function inputAvailabilityCheckMode() { + return input({ + validate: is('null', 'empty', 'falsy', 'index'), + defaultValue: 'null', + }); +} diff --git a/src/data/composite/control-flow/raiseOutputWithoutDependency.js b/src/data/composite/control-flow/raiseOutputWithoutDependency.js new file mode 100644 index 0000000..3d04f8a --- /dev/null +++ b/src/data/composite/control-flow/raiseOutputWithoutDependency.js @@ -0,0 +1,39 @@ +// Raises if a dependency isn't available. +// See withResultOfAvailabilityCheck for {mode} options. + +import {input, templateCompositeFrom} from '#composite'; + +import inputAvailabilityCheckMode from './inputAvailabilityCheckMode.js'; +import withResultOfAvailabilityCheck from './withResultOfAvailabilityCheck.js'; + +export default templateCompositeFrom({ + annotation: `raiseOutputWithoutDependency`, + + inputs: { + dependency: input({acceptsNull: true}), + mode: inputAvailabilityCheckMode(), + output: input.staticValue({defaultValue: {}}), + }, + + outputs: ({ + [input.staticValue('output')]: output, + }) => Object.keys(output ?? {}), + + steps: () => [ + withResultOfAvailabilityCheck({ + from: input('dependency'), + mode: input('mode'), + }), + + { + dependencies: ['#availability', input('output')], + compute: (continuation, { + ['#availability']: availability, + [input('output')]: output, + }) => + (availability + ? continuation() + : continuation.raiseOutputAbove(output)), + }, + ], +}); diff --git a/src/data/composite/control-flow/raiseOutputWithoutUpdateValue.js b/src/data/composite/control-flow/raiseOutputWithoutUpdateValue.js new file mode 100644 index 0000000..ffa83a9 --- /dev/null +++ b/src/data/composite/control-flow/raiseOutputWithoutUpdateValue.js @@ -0,0 +1,47 @@ +// Raises if this property's update value isn't available. +// See withResultOfAvailabilityCheck for {mode} options! + +import {input, templateCompositeFrom} from '#composite'; + +import inputAvailabilityCheckMode from './inputAvailabilityCheckMode.js'; +import withResultOfAvailabilityCheck from './withResultOfAvailabilityCheck.js'; + +export default templateCompositeFrom({ + annotation: `raiseOutputWithoutUpdateValue`, + + inputs: { + mode: inputAvailabilityCheckMode(), + output: input.staticValue({defaultValue: {}}), + }, + + outputs: ({ + [input.staticValue('output')]: output, + }) => Object.keys(output ?? {}), + + steps: () => [ + withResultOfAvailabilityCheck({ + from: input.updateValue(), + mode: input('mode'), + }), + + // TODO: A bit of a kludge, below. Other "do something with the update + // value" type functions can get by pretty much just passing that value + // as an input (input.updateValue()) into the corresponding "do something + // with a dependency/arbitrary value" function. But we can't do that here, + // because the special behavior, raiseOutputAbove(), only works to raise + // output above the composition it's *directly* nested in. Other languages + // have a throw/catch system that might serve as inspiration for something + // better here. + + { + dependencies: ['#availability', input('output')], + compute: (continuation, { + ['#availability']: availability, + [input('output')]: output, + }) => + (availability + ? continuation() + : continuation.raiseOutputAbove(output)), + }, + ], +}); diff --git a/src/data/composite/control-flow/withResultOfAvailabilityCheck.js b/src/data/composite/control-flow/withResultOfAvailabilityCheck.js new file mode 100644 index 0000000..a694201 --- /dev/null +++ b/src/data/composite/control-flow/withResultOfAvailabilityCheck.js @@ -0,0 +1,71 @@ +// Checks the availability of a dependency and provides the result to later +// steps under '#availability' (by default). This is mainly intended for use +// by the more specific utilities, which you should consider using instead. +// +// Customize {mode} to select one of these modes, or default to 'null': +// +// * 'null': Check that the value isn't null (and not undefined either). +// * 'empty': Check that the value is neither null, undefined, nor an empty +// array. +// * 'falsy': Check that the value isn't false when treated as a boolean +// (nor an empty array). Keep in mind this will also be false +// for values like zero and the empty string! +// * 'index': Check that the value is a number, and is at least zero. +// +// See also: +// - exitWithoutDependency +// - exitWithoutUpdateValue +// - exposeDependencyOrContinue +// - exposeUpdateValueOrContinue +// - raiseOutputWithoutDependency +// - raiseOutputWithoutUpdateValue +// + +import {input, templateCompositeFrom} from '#composite'; +import {empty} from '#sugar'; + +import inputAvailabilityCheckMode from './inputAvailabilityCheckMode.js'; + +export default templateCompositeFrom({ + annotation: `withResultOfAvailabilityCheck`, + + inputs: { + from: input({acceptsNull: true}), + mode: inputAvailabilityCheckMode(), + }, + + outputs: ['#availability'], + + steps: () => [ + { + dependencies: [input('from'), input('mode')], + + compute: (continuation, { + [input('from')]: value, + [input('mode')]: mode, + }) => { + let availability; + + switch (mode) { + case 'null': + availability = value !== undefined && value !== null; + break; + + case 'empty': + availability = value !== undefined && !empty(value); + break; + + case 'falsy': + availability = !!value && (!Array.isArray(value) || !empty(value)); + break; + + case 'index': + availability = typeof value === 'number' && value >= 0; + break; + } + + return continuation({'#availability': availability}); + }, + }, + ], +}); |