329 lines
12 KiB
TypeScript
329 lines
12 KiB
TypeScript
import "../../node_modules/svelte/register.js";
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import clearModule from "clear-module";
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import config from "config";
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import crypto from "crypto";
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import {promises as fs} from 'fs';
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import path from "path";
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import requireFromString from "require-from-string";
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import {compile, preprocess} from "svelte/compiler";
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import {CssResult} from "svelte/types/compiler/interfaces";
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import {sveltePreprocess} from "svelte-preprocess/dist/autoProcess.js";
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import {logger} from "../Logger.js";
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import FileCache from "../utils/FileCache.js";
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import ViewEngine from "./ViewEngine.js";
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const BACKEND_CODE_PREFIX = '$locals.';
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const BACKEND_CODE_PREFIX_TEMPORARY_HOLDER = '$$locals$$';
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const COMPILED_SVELTE_EXTENSION = '.precompiled';
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export default class SvelteViewEngine extends ViewEngine {
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public static getPreCompileSeparator(canonicalViewName: string): string {
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return '\n---' +
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crypto.createHash('sha1')
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.update(path.basename(path.resolve(canonicalViewName)))
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.digest('base64') +
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'---\n';
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}
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private readonly fileCache: FileCache = new FileCache();
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private readonly dependencyCache: Record<string, Set<string>> = {};
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private readonly preprocessingCache: Record<string, PreprocessingCacheEntry> = {};
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public constructor(
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targetDir: string,
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...additionalViewPaths: string[]
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) {
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super(targetDir, 'views', 'svelte', true, ...additionalViewPaths);
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}
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public async onFileChange(file: string): Promise<void> {
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delete this.preprocessingCache[this.toCanonicalName(file)];
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await super.onFileChange(file);
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}
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public async onFileRemove(file: string): Promise<void> {
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const canonicalName = this.toCanonicalName(file);
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delete this.preprocessingCache[canonicalName];
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delete this.dependencyCache[canonicalName];
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Object.values(this.dependencyCache).forEach(set => set.delete(canonicalName));
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await super.onFileRemove(file);
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}
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public async render(
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file: string,
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locals: Record<string, unknown>,
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): Promise<string> {
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const canonicalViewName = this.toCanonicalName(file);
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// View
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const actualFile = path.join(this.targetDir, canonicalViewName + COMPILED_SVELTE_EXTENSION);
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const view = await this.fileCache.get(actualFile, !config.get<boolean>('view.cache'));
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// Root template
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const templateFile = await this.resolveFileFromCanonicalNameOrFail('layouts/svelte_layout.html');
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const rawOutput = await this.fileCache.get(templateFile, !config.get<boolean>('view.cache'));
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// Pre-compiled parts
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const [
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backendCalls,
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head,
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html,
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css,
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] = view.split(SvelteViewEngine.getPreCompileSeparator(canonicalViewName));
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const localMap: Record<string, unknown> = this.compileBackendCalls(backendCalls.split('\n'), locals, false);
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const actualLocals = JSON.stringify(localMap, (key, value) => {
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return typeof value === 'function' ?
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value.toString() :
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value;
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});
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// Replaces
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const replaceMap: Record<string, string> = {
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canonicalViewName: canonicalViewName,
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locals: actualLocals,
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head: head,
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html: html,
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css: css,
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};
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return rawOutput.replace(
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new RegExp(Object.keys(replaceMap).map(str => `%${str}%`).join('|'), 'g'),
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(substring) => replaceMap[substring.slice(1, substring.length - 1)],
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);
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}
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public async preCompile(canonicalName: string, alsoCompileDependents: boolean): Promise<void> {
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const intermediateFile = path.join(this.targetDir, canonicalName);
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logger.info(canonicalName + ' > ', 'Pre-compiling', canonicalName, '->', intermediateFile);
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const allBackendCalls: string[] = [];
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const {backendCalls, code} = await this.preprocess(canonicalName);
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allBackendCalls.push(...backendCalls);
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// Server Side Render (initial HTML and CSS, no-js)
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const ssr = await this.compileSsr(canonicalName, intermediateFile, code, allBackendCalls);
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const separator = SvelteViewEngine.getPreCompileSeparator(canonicalName);
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const finalCode = [
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[...new Set<string>(allBackendCalls).values()].join('\n'),
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ssr.head,
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ssr.html,
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ssr.css.code,
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].join(separator);
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const swafViewFile = path.join(this.targetDir, canonicalName + COMPILED_SVELTE_EXTENSION);
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await fs.mkdir(path.dirname(swafViewFile), {recursive: true});
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await fs.writeFile(swafViewFile, finalCode);
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if (alsoCompileDependents && Object.keys(this.dependencyCache).indexOf(canonicalName) >= 0) {
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logger.info(canonicalName + ' > ', 'Compiling dependents...');
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for (const dependent of [...this.dependencyCache[canonicalName]]) {
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await this.preCompile(dependent, true);
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}
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}
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}
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private resolveDependencies(source: string, canonicalViewName: string): string[] {
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const dependencies: string[] = [];
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for (const match of source.matchAll(/import .+ from ['"](.+?\.svelte)['"];/gm)) {
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dependencies.push(path.join(path.dirname(canonicalViewName), match[1]));
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}
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// Clear existing links from cache
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for (const dependency of Object.keys(this.dependencyCache)) {
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this.dependencyCache[dependency].delete(canonicalViewName);
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}
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// Add new links to cache
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for (const dependency of dependencies) {
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if (Object.keys(this.dependencyCache).indexOf(dependency) < 0) {
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this.dependencyCache[dependency] = new Set<string>();
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}
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this.dependencyCache[dependency].add(canonicalViewName);
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}
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return dependencies;
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}
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private async preprocess(canonicalName: string): Promise<PreprocessingCacheEntry> {
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// Cache
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if (Object.keys(this.preprocessingCache).indexOf(canonicalName) >= 0) {
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return this.preprocessingCache[canonicalName];
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}
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const file = await this.resolveFileFromCanonicalNameOrFail(canonicalName);
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logger.info(canonicalName + ' > ', `Preprocessing ${file}`);
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// mkdir output file dir
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const outputFile = path.join(this.targetDir, canonicalName);
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await fs.mkdir(path.dirname(outputFile), {recursive: true});
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// Read source file if code was not already provided
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const code = await this.fileCache.get(file, !config.get<boolean>('view.cache'));
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// Replace backend calls
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const replacedBackendCalls = await this.replaceBackendCalls(canonicalName, code);
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// Preprocess svelte
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logger.info(canonicalName + ' > ', 'Svelte preprocessing');
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const preprocessed = await preprocess(
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replacedBackendCalls.code,
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sveltePreprocess({
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typescript: {
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tsconfigFile: 'tsconfig.svelte.json',
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},
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}),
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{
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filename: outputFile,
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},
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);
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// Write to output file
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await fs.writeFile(outputFile, preprocessed.code);
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// Preprocess dependencies
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const backendCalls: string[] = replacedBackendCalls.backendCalls;
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for (const dependency of this.resolveDependencies(code, canonicalName)) {
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backendCalls.push(...(await this.preprocess(dependency)).backendCalls);
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}
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return this.preprocessingCache[canonicalName] = {
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backendCalls: backendCalls,
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code: preprocessed.code,
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};
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}
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private async replaceBackendCalls(canonicalName: string, code: string): Promise<PreprocessingCacheEntry> {
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logger.info(canonicalName + ' > ', 'Replacing backend calls');
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// Skip replace if there is no swaf export
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if (!code.match(/import[ \n]+\{[ \n]*locals[ \n]*\}[ \n]+from[ \n]+["'](\.\.\/)+ts\/stores\.js["']/)) {
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return {
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backendCalls: [],
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code: code,
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};
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}
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let output = code;
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const backendCalls = new Set<string>();
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let index = 0;
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while ((index = output.indexOf(BACKEND_CODE_PREFIX, index + 1)) >= 0) {
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// Escaping
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if (index > 0 && output[index - 1] === '\\') {
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const isEscapingEscaped: boolean = index > 1 && output[index - 2] === '\\';
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output = output.substring(0, index - 1 - (isEscapingEscaped ? 1 : 0)) +
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output.substring(index, output.length);
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continue;
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}
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const startIndex = index + BACKEND_CODE_PREFIX.length;
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let endIndex = startIndex;
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let struct = 0;
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while (endIndex < output.length) {
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if (['(', '[', '{'].indexOf(output[endIndex]) >= 0) struct++;
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if ([')', ']', '}'].indexOf(output[endIndex]) >= 0) {
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struct--;
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if (struct <= 0) {
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if (struct === 0) endIndex++;
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break;
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}
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}
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if ([' ', '\n', '<', '.', '\'', '"'].indexOf(output[endIndex]) >= 0 && struct === 0) break;
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endIndex++;
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}
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let backendCall = output.substring(startIndex, endIndex);
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if (backendCall.match(/([^()]+)\((.+?)\)/)) {
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backendCall = backendCall.replace(/([^()]+)\((.+?)\)/, "'$1', `[$2]`");
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} else {
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backendCall = backendCall.replace(/([^()]+)(\(\))?/, "'$1'");
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}
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backendCalls.add(backendCall);
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output = output.substring(0, index) +
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'$locals(' + backendCall.split(BACKEND_CODE_PREFIX).join(BACKEND_CODE_PREFIX_TEMPORARY_HOLDER) + ')' +
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output.substring(endIndex, output.length);
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}
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output = output.split(BACKEND_CODE_PREFIX_TEMPORARY_HOLDER).join(BACKEND_CODE_PREFIX);
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return {
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backendCalls: [...backendCalls],
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code: output,
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};
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}
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private async compileSsr(canonicalName: string, file: string, code: string, backendCalls: string[]): Promise<{
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head: string,
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css: CssResult,
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html: string,
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}> {
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// Svelte compile
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logger.info(canonicalName + ' > ', 'Compiling svelte ssr', file);
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const svelteSsr = compile(code, {
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dev: config.get<boolean>('view.dev'),
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generate: 'ssr',
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format: 'cjs',
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cssOutputFilename: file + '.css',
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});
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// Load locals into locals store
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const localsModulePath = "../../build/ts/stores.js";
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const localsModule = await import(localsModulePath);
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const locals = ViewEngine.getGlobals();
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const localMap = this.compileBackendCalls(backendCalls, locals, true);
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localsModule.locals.set((key: string, args: string) => {
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return localMap[args ?
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`'${key}', \`${args}\``
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: `'${key}'`];
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});
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// Load module and render
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const moduleId = path.resolve(file);
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clearModule.single(moduleId);
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return requireFromString(svelteSsr.js.code, moduleId).default.render();
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}
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private compileBackendCalls(
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backendCalls: string[],
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locals: Record<string, unknown>,
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isPreRender: boolean,
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): Record<string, unknown> {
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locals = {...locals, isPreRender};
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const localMap: Record<string, unknown> = {};
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backendCalls.forEach(code => {
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const key = code.substring(1, code.indexOf(',') >= 0 ? code.indexOf(',') - 1 : code.length - 1);
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if (code.indexOf('`[') >= 0) {
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const args = code.substring(code.indexOf('`[') + 2, code.length - 2)
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.split(/, *?/)
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.map(arg => {
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if (arg.startsWith("'")) return '"' + arg.substring(1, arg.length - 1) + '"';
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return arg;
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})
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.map(arg => Function(`"use strict";const $locals = arguments[0];return (${arg});`)(locals)); // Uses named parameter locals
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const f = locals[key];
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if (typeof f !== 'function') throw new Error(key + ' is not a function.');
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localMap[`'${key}', \`[${code.substring(code.indexOf('`[') + 2, code.length - 2)}]\``] = f.call(locals, ...args);
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} else {
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localMap[`'${key}'`] = locals[key];
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}
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});
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return localMap;
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}
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}
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type PreprocessingCacheEntry = {
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backendCalls: string[],
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code: string,
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};
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