77 lines
2.5 KiB
JavaScript
77 lines
2.5 KiB
JavaScript
(() => {
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const I = new PreservesSchema.SchemaInterpreter();
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globalThis.Schema = { __interpreter: I };
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let schemaReady;
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globalThis.SchemaReady = new Promise(res => schemaReady = res);
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async function translateScripts() {
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const schemaScripts =
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Array.from(document.getElementsByTagName('script'))
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.filter(s => (s.type === 'text/preserves+schema' ||
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s.type === 'schema'));
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for (const script of schemaScripts) {
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function complain(message, detail) {
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const e = new Error(message);
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e.script = script;
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e.detail = detail;
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console.error(e);
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}
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let sourceCodeBlob;
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const sourceUrl = script.src || script.getAttribute('data-src') || false;
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if (sourceUrl) {
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const res = await fetch(sourceUrl);
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if (res.ok) {
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sourceCodeBlob = new Uint8Array(await res.arrayBuffer());
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} else {
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complain(`Failed to retrieve schema from ${sourceUrl}`, { res });
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continue;
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}
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} else {
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sourceCodeBlob = new TextEncoder().encode(script.innerHTML);
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}
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const schemaName = () => {
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const n = script.getAttribute('name');
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if (n === null) complain(`<script type="schema"> must have name attribute`);
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return n;
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};
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if (sourceCodeBlob[0] >= 128) {
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// Binary Preserves blob
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const value = Preserves.decode(sourceCodeBlob);
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const bundle = PreservesSchema.Meta.toBundle(value);
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if (bundle !== void 0) {
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const prefixStr = script.getAttribute('prefix');
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const bundlePrefix = (prefixStr ? prefixStr.split('.') : []).map(Symbol.for);
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bundle.modules.forEach((schema, path) => {
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const modulePath = [... bundlePrefix, ... path];
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I.env.set(modulePath, schema);
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});
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} else {
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const schema = PreservesSchema.Meta.toSchema(value);
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if (schema !== void 0) {
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const modulePath = schemaName().split('.').map(Symbol.for);
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I.env.set(modulePath, schema);
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}
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}
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} else {
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// Presumably text
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const sourceCode = new TextDecoder('utf-8', { fatal: true }).decode(sourceCodeBlob);
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const name = schemaName();
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const schema = PreservesSchema.readSchema(sourceCode, { name });
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const modulePath = name.split('.').map(Symbol.for);
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I.env.set(modulePath, schema);
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}
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}
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I.moduleTree(Schema);
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schemaReady();
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}
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window.addEventListener('DOMContentLoaded', translateScripts);
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})();
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