Svelte: refactor many symbols and safe eval backend calls arguments
Also allow dumping function contents by outputing them directly
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bd2b7e7579
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@ -12,8 +12,9 @@ import {CssResult} from "svelte/types/compiler/interfaces";
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import * as child_process from "child_process";
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import fs from "fs";
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const BACKEND_CODE_PREFIX = 'swaf.';
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const COMPILED_SVELTE_EXTENSION = '.swafview';
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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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@ -27,9 +28,9 @@ export default class SvelteViewEngine extends ViewEngine {
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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 backendCodeCache: Record<string, {
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backendReplacedCode: string,
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backendLines: string[],
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private readonly backendCallsCache: Record<string, {
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replacedBackendCall: string,
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backendCalls: string[],
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}> = {};
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private rollup?: child_process.ChildProcess;
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@ -76,47 +77,48 @@ export default class SvelteViewEngine extends ViewEngine {
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// Pre-compiled parts
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const [
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backendLines,
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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> = {};
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backendLines.split('\n').forEach(line => {
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const key = line.substring(1, line.indexOf(',') >= 0 ? line.indexOf(',') - 1 : line.length - 1);
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if (line.indexOf('[') >= 0) {
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const args = line.substring(line.indexOf('[') + 1, line.length - 1)
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backendCalls.split('\n').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 => JSON.parse(arg));
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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}', ${JSON.stringify(args)}`] = f.call(locals, ...args);
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localMap[`'${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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const props = JSON.stringify(localMap);
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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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props: props,
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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) => {
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console.log(substring);
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return replaceMap[substring.slice(1, substring.length - 1)];
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},
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(substring) => replaceMap[substring.slice(1, substring.length - 1)],
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);
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}
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@ -132,20 +134,20 @@ export default class SvelteViewEngine extends ViewEngine {
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logger.info(canonicalName + ' > ', 'Pre-compiling', file, '->', intermediateFile);
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const source = await this.fileCache.get(file, !config.get<boolean>('view.cache'));
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const allBackendLines: string[] = [];
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const allBackendCalls: string[] = [];
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for (const dependency of this.resolveDependencies(source, canonicalName)) {
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allBackendLines.push(...(await this.replaceBackendCode(dependency)).backendLines);
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allBackendCalls.push(...(await this.replaceBackendCalls(dependency)).backendCalls);
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}
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const {backendReplacedCode, backendLines} = await this.replaceBackendCode(canonicalName, source);
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allBackendLines.push(...backendLines);
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const {replacedBackendCall, backendCalls} = await this.replaceBackendCalls(canonicalName, source);
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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, backendReplacedCode);
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const ssr = await this.compileSsr(canonicalName, intermediateFile, replacedBackendCall);
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const separator = SvelteViewEngine.getPreCompileSeparator(canonicalName);
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const finalCode = [
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[...new Set<string>(allBackendLines).values()].join('\n'),
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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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@ -186,13 +188,13 @@ export default class SvelteViewEngine extends ViewEngine {
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return dependencies;
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}
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private async replaceBackendCode(canonicalViewName: string, code?: string): Promise<{
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backendReplacedCode: string,
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backendLines: string[],
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private async replaceBackendCalls(canonicalViewName: string, code?: string): Promise<{
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replacedBackendCall: string,
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backendCalls: string[],
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}> {
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// Cache
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if (Object.keys(this.backendCodeCache).indexOf(canonicalViewName) >= 0) {
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return this.backendCodeCache[canonicalViewName];
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if (Object.keys(this.backendCallsCache).indexOf(canonicalViewName) >= 0) {
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return this.backendCallsCache[canonicalViewName];
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}
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// mkdir output file dir
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@ -206,19 +208,19 @@ export default class SvelteViewEngine extends ViewEngine {
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}
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// Skip replace if there is no swaf export
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if (!code.match(/export[ \n]+let[ \n]+swaf[ \n]*=[ \n]*{[ \n]*}/)) {
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if (!code.match(/export[ \n]+let[ \n]+locals[ \n]*=[ \n]*{[ \n]*}/)) {
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const generated = {
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backendReplacedCode: code,
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backendLines: [],
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replacedBackendCall: code,
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backendCalls: [],
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};
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await afs.writeFile(outputFile, generated.backendReplacedCode);
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this.backendCodeCache[canonicalViewName] = generated;
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await afs.writeFile(outputFile, generated.replacedBackendCall);
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this.backendCallsCache[canonicalViewName] = generated;
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return generated;
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}
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let output = code;
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const backendLines = new Set<string>();
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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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@ -247,31 +249,32 @@ export default class SvelteViewEngine extends ViewEngine {
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endIndex++;
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}
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let backendLine = output.substring(startIndex, endIndex);
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if (backendLine.match(/([^()]+)\((.+?)\)/)) {
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backendLine = backendLine.replace(/([^()]+)\((.+?)\)/, "'$1', [$2]");
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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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backendLine = backendLine.replace(/([^()]+)/, "'$1'");
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backendCall = backendCall.replace(/([^()]+)/, "'$1'");
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}
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backendCalls.add(backendCall);
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backendLines.add(backendLine);
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output = output.substring(0, index) +
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'swaf(' + backendLine + ')' +
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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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const generated = {
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backendReplacedCode: output,
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backendLines: [...backendLines],
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replacedBackendCall: output,
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backendCalls: [...backendCalls],
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};
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await afs.writeFile(outputFile, generated.backendReplacedCode);
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this.backendCodeCache[canonicalViewName] = generated;
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await afs.writeFile(outputFile, generated.replacedBackendCall);
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this.backendCallsCache[canonicalViewName] = generated;
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return generated;
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}
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public async afterPreCompile(watch: boolean): Promise<void> {
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await this.bundle(watch, ...Object.keys(this.backendCodeCache));
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await this.bundle(watch, ...Object.keys(this.backendCallsCache));
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}
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@ -280,12 +283,12 @@ export default class SvelteViewEngine extends ViewEngine {
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}
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public async onFileChange(file: string): Promise<void> {
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delete this.backendCodeCache[this.toCanonicalName(file)];
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delete this.backendCallsCache[this.toCanonicalName(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.backendCodeCache[canonicalName];
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delete this.backendCallsCache[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 this.stopRollup();
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@ -322,14 +325,16 @@ export default class SvelteViewEngine extends ViewEngine {
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const globals = ViewEngine.getGlobals();
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delete require.cache[path.resolve(file)];
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return requireFromString(svelteSsr.js.code, file).default.render({
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swaf: (key: string, args?: unknown[]) => {
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if (!args) return globals[key];
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const localsFunction = (key: string, rawArgs?: string) => {
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if (!rawArgs) return globals[key];
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const args = Function(`"use strict";const locals = Object.assign(arguments[0], arguments[1]);return (${rawArgs});`)(localsFunction, globals) as string[];
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const f = globals[key];
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if (typeof f !== 'function') throw new Error(key + ' is not a function.');
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return f.call(globals, ...args);
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},
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};
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return requireFromString(svelteSsr.js.code, file).default.render({
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locals: localsFunction,
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});
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}
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@ -2,13 +2,14 @@
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import HomeDep from "./home_dep.svelte";
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import Layout from "./layout.svelte";
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export let swaf = {};
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export let locals = {};
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let count = 5;
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function handleClick() {
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count++;
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}
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let depTest;
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</script>
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@ -34,24 +35,24 @@
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<button on:click={handleClick}>More hellos!!</button>
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<p>Direct access: {swaf.direct}</p>
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<p>Direct access: {locals.direct}</p>
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{#if swaf.route('auth') === '/'}
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{#if locals.route('auth') === '/'}
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We're home!
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{:else}
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We're somewhere else... {swaf.route('auth')}
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We're somewhere else... {locals.route('auth')}
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{/if}
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<p>The route to auth is {swaf.route('auth')}</p>
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<p>The route to auth is {locals.route('auth')}</p>
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<p>\swaf.notcode</p>
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<p>\locals.notcode</p>
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<p>{`{\\swaf.escaped}`}</p>
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<p>{`{\\locals.escaped}`}</p>
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<div class="style-test">
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<p>Blue!</p>
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</div>
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<HomeDep swaf={swaf} bind:depTest={depTest}/>
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<HomeDep locals={locals} bind:depTest={depTest}/>
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<p>Dependency test: {depTest}</p>
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@ -1,6 +1,8 @@
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<script lang="ts">
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export let depTest = 'Success';
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export let swaf = {};
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export let locals = {};
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let locallyDefinedVar = 'correct value';
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</script>
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<style>
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@ -11,7 +13,13 @@
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<p>Simple dep test</p>
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<p>\locals.</p>
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<p>\locals.</p>
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<p>Nested swaf call: {swaf.direct}</p>
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<p>Nested swaf call: {swaf.route('auth')}</p>
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<p>Nested swaf call: {swaf.route('home')}</p>
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<p>locals: {locals}</p>
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<p>\locals.route: {locals.route} <br> {locals.dump(typeof locals.route)}</p>
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<p>\locals.dump: {locals.dump('bonjour')}</p>
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<p>\locals.dump: {locals.dump(locals.app)}</p>
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<p>\locals.dump: {locals.dump(NaN)}</p>
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<p>\locals.route: {locals.route('auth')}</p>
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<p>\locals.route: {locals.route('home')}</p>
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@ -7,17 +7,16 @@
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<script type="module" defer>
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import View from '/js/%canonicalViewName%.js';
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const props = %props%;
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const locals = %locals%;
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new View({
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hydrate: true,
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target: document.body,
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props: {
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swaf: (key, args) => {
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const line = args ?
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`'${key}', ${JSON.stringify(args)}`
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: `'${key}'`;
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return props[line];
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locals: (key, args) => {
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return locals[args ?
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`'${key}', \`${args}\``
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: `'${key}'`];
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},
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},
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});
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