66 lines
1.7 KiB
JavaScript
66 lines
1.7 KiB
JavaScript
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// @ts-check
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const assert = require("assert")
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/** Mutates the input. */
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function kstateStripConditionals(kstate) {
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for (const [k, content] of Object.entries(kstate)) {
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// conditional for whether a key is even part of the kstate (doing this declaratively on json is hard, so represent it as a property instead.)
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if ("$if" in content) {
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if (content.$if) delete content.$if
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else delete kstate[k]
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}
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}
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return kstate
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}
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function kstateToState(kstate) {
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const events = []
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kstateStripConditionals(kstate)
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for (const [k, content] of Object.entries(kstate)) {
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const [type, state_key] = k.split("/")
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assert.ok(typeof type === "string")
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assert.ok(typeof state_key === "string")
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events.push({type, state_key, content})
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}
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return events
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}
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/**
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* @param {import("../types").Event.BaseStateEvent[]} events
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* @returns {any}
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*/
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function stateToKState(events) {
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const kstate = {}
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for (const event of events) {
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kstate[event.type + "/" + event.state_key] = event.content
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}
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return kstate
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}
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function diffKState(actual, target) {
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const diff = {}
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// go through each key that it should have
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for (const key of Object.keys(target)) {
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if (key in actual) {
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// diff
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try {
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assert.deepEqual(actual[key], target[key])
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} catch (e) {
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// they differ. reassign the target
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diff[key] = target[key]
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}
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} else {
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// not present, needs to be added
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diff[key] = target[key]
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}
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// keys that are missing in "actual" will not be deleted on "target" (no action)
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}
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return diff
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}
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module.exports.kstateStripConditionals = kstateStripConditionals
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module.exports.kstateToState = kstateToState
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module.exports.stateToKState = stateToKState
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module.exports.diffKState = diffKState
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