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import {empty} from './util/sugar.js';
export default function contentFunction({
contentDependencies = [],
extraDependencies = [],
data,
generate,
}) {
return expectDependencies({
data,
generate,
expectedContentDependencyKeys: contentDependencies,
expectedExtraDependencyKeys: extraDependencies,
fulfilledDependencies: {},
});
}
contentFunction.identifyingSymbol = Symbol(`Is a content function?`);
export function expectDependencies({
generate,
data,
expectedContentDependencyKeys,
expectedExtraDependencyKeys,
fulfilledDependencies,
}) {
if (!generate) {
throw new Error(`Expected generate function`);
}
if (!data) {
throw new Error(`Expected data function`);
}
const fulfilledDependencyKeys = Object.keys(fulfilledDependencies);
const invalidatingDependencyKeys = Object.entries(fulfilledDependencies)
.filter(([key, value]) => value.fulfilled === false)
.map(([key]) => key);
const missingContentDependencyKeys = expectedContentDependencyKeys
.filter(key => !fulfilledDependencyKeys.includes(key));
const missingExtraDependencyKeys = expectedExtraDependencyKeys
.filter(key => !fulfilledDependencyKeys.includes(key));
let wrappedGenerate;
if (!empty(invalidatingDependencyKeys)) {
wrappedGenerate = function() {
throw new Error(`Generate invalidated because unfulfilled dependencies provided: ${invalidatingDependencyKeys.join(', ')}`);
};
wrappedGenerate.fulfilled ??= false;
}
if (empty(missingContentDependencyKeys) && empty(missingExtraDependencyKeys)) {
wrappedGenerate ??= function(data) {
return generate(data, fulfilledDependencies);
};
wrappedGenerate.fulfill = function() {
throw new Error(`All dependencies already fulfilled`);
};
wrappedGenerate.fulfilled ??= true;
}
wrappedGenerate ??= function() {
throw new Error(`Dependencies still needed: ${missingContentDependencyKeys.concat(missingExtraDependencyKeys).join(', ')}`);
};
wrappedGenerate.fulfilled ??= false;
wrappedGenerate[contentFunction.identifyingSymbol] = true;
if (empty(missingContentDependencyKeys)) {
const dataDependencies = {};
for (const key of expectedContentDependencyKeys) {
const wrappedDependency = function() {
throw new Error(`Expected call to this dependency's .data()`);
};
wrappedDependency.data = fulfilledDependencies[key].data;
dataDependencies[key] = wrappedDependency;
}
wrappedGenerate.data = function(...args) {
return data(...args, dataDependencies);
};
}
wrappedGenerate.data ??= function() {
throw new Error(`Dependencies still needed: ${missingContentDependencyKeys.join(', ')}`);
};
wrappedGenerate.fulfill ??= function(dependencies) {
return expectDependencies({
generate,
data,
expectedContentDependencyKeys,
expectedExtraDependencyKeys,
fulfilledDependencies: fulfillDependencies({
name: generate.name,
dependencies,
expectedContentDependencyKeys,
expectedExtraDependencyKeys,
fulfilledDependencies,
}),
});
};
return wrappedGenerate;
}
export function fulfillDependencies({
name,
dependencies,
expectedContentDependencyKeys,
expectedExtraDependencyKeys,
fulfilledDependencies,
}) {
const newFulfilledDependencies = {...fulfilledDependencies};
const fulfilledDependencyKeys = Object.keys(fulfilledDependencies);
const errors = [];
let bail = false;
for (let [key, value] of Object.entries(dependencies)) {
if (key.startsWith('u_')) {
key = key.slice(2);
}
if (fulfilledDependencyKeys.includes(key)) {
errors.push(new Error(`Dependency ${key} is already fulfilled`));
bail = true;
continue;
}
const isContentKey = expectedContentDependencyKeys.includes(key);
const isExtraKey = expectedExtraDependencyKeys.includes(key);
if (!isContentKey && !isExtraKey) {
errors.push(new Error(`Dependency ${key} is not expected`));
bail = true;
continue;
}
if (isContentKey && !value[contentFunction.identifyingSymbol]) {
errors.push(new Error(`Content dependency ${key} is not a content function`));
bail = true;
continue;
}
if (isExtraKey && value[contentFunction.identifyingSymbol]) {
errors.push(new Error(`Extra dependency ${key} is a content function`));
bail = true;
continue;
}
if (!bail) {
newFulfilledDependencies[key] = value;
}
}
if (!empty(errors)) {
throw new AggregateError(errors, `Errors fulfilling dependencies for ${name}`);
}
return newFulfilledDependencies;
}
|
