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import { walk } from 'estree-walker';
import type { Ast, TemplateNode } from '../../parser/interfaces';
import { NodeVisitor, Optimizer, VisitorFn } from '../../@types/optimizer';
// Optimizers
import optimizeStyles from './styles.js';
import optimizeDoctype from './doctype.js';
interface VisitorCollection {
enter: Map<string, VisitorFn[]>;
leave: Map<string, VisitorFn[]>;
}
function addVisitor(visitor: NodeVisitor, collection: VisitorCollection, nodeName: string, event: 'enter' | 'leave') {
if (typeof visitor[event] !== 'function') return;
if (!collection[event]) collection[event] = new Map<string, VisitorFn[]>();
const visitors = collection[event].get(nodeName) || [];
visitors.push(visitor[event] as any);
collection[event].set(nodeName, visitors);
}
function collectVisitors(optimizer: Optimizer, htmlVisitors: VisitorCollection, cssVisitors: VisitorCollection, finalizers: Array<() => Promise<void>>) {
if (optimizer.visitors) {
if (optimizer.visitors.html) {
for (const [nodeName, visitor] of Object.entries(optimizer.visitors.html)) {
addVisitor(visitor, htmlVisitors, nodeName, 'enter');
addVisitor(visitor, htmlVisitors, nodeName, 'leave');
}
}
if (optimizer.visitors.css) {
for (const [nodeName, visitor] of Object.entries(optimizer.visitors.css)) {
addVisitor(visitor, cssVisitors, nodeName, 'enter');
addVisitor(visitor, cssVisitors, nodeName, 'leave');
}
}
}
finalizers.push(optimizer.finalize);
}
function createVisitorCollection() {
return {
enter: new Map<string, VisitorFn[]>(),
leave: new Map<string, VisitorFn[]>(),
};
}
function walkAstWithVisitors(tmpl: TemplateNode, collection: VisitorCollection) {
walk(tmpl, {
enter(node, parent, key, index) {
if (collection.enter.has(node.type)) {
const fns = collection.enter.get(node.type)!;
for (let fn of fns) {
fn(node, parent, key, index);
}
}
},
leave(node, parent, key, index) {
if (collection.leave.has(node.type)) {
const fns = collection.leave.get(node.type)!;
for (let fn of fns) {
fn(node, parent, key, index);
}
}
},
});
}
interface OptimizeOptions {
filename: string;
fileID: string;
}
export async function optimize(ast: Ast, opts: OptimizeOptions) {
const htmlVisitors = createVisitorCollection();
const cssVisitors = createVisitorCollection();
const finalizers: Array<() => Promise<void>> = [];
const optimizers = [optimizeStyles(opts), optimizeDoctype(opts)];
for (const optimizer of optimizers) {
collectVisitors(optimizer, htmlVisitors, cssVisitors, finalizers);
}
walkAstWithVisitors(ast.css, cssVisitors);
walkAstWithVisitors(ast.html, htmlVisitors);
// Run all of the finalizer functions in parallel because why not.
await Promise.all(finalizers.map((fn) => fn()));
}
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