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index.js
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index.js
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import path from "path";
import { createHash } from "crypto";
import { types as t } from "@marko/babel-types";
import { getLoc, getTemplateId } from "@marko/babel-utils";
import { visitors } from "@babel/traverse";
import { buildLookup } from "../taglib";
import { parseMarko } from "./parser";
import { visitor as migrate } from "./plugins/migrate";
import { visitor as transform } from "./plugins/transform";
import markoModules from "../../modules";
import { MarkoFile } from "./file";
const SOURCE_FILES = new WeakMap();
export default (api, markoOpts) => {
api.assertVersion(7);
let translator = markoOpts.translator;
if (typeof translator === "string") {
try {
translator = markoModules.require(translator);
} catch (err) {
try {
translator = markoModules.require(`@marko/translator-${translator}`);
} catch {
try {
translator = markoModules.require(`marko-translator-${translator}`);
} catch {
throw err;
}
}
}
}
markoOpts.translator = translator;
markoOpts.output = markoOpts.output || "html";
if (markoOpts.optimize === undefined) {
api.cache.using(shouldOptimize);
markoOpts.optimize = shouldOptimize();
}
if (!translator || !translator.translate) {
throw new Error(
"@marko/compiler: translator must provide a translate visitor object"
);
}
return {
name: "marko",
parserOverride(code, jsParseOptions) {
const file = getMarkoFile(code, jsParseOptions, markoOpts);
const finalAst = t.cloneDeep(file.ast);
SOURCE_FILES.set(finalAst, file);
return finalAst;
},
pre(file) {
const { ast, metadata } = file;
const sourceFile = SOURCE_FILES.get(ast);
metadata.marko = shallowClone(sourceFile.metadata.marko);
if (markoOpts._translate !== false) {
const { buildCodeFrameError } = file;
const { buildError } = file.hub;
file.buildCodeFrameError = MarkoFile.prototype.buildCodeFrameError;
file.hub.buildError = file.buildCodeFrameError.bind(file);
file.markoOpts = markoOpts;
file.___taglibLookup = sourceFile.___taglibLookup;
file.___getMarkoFile = getMarkoFile;
traverseAll(file, translator.translate);
file.buildCodeFrameError = buildCodeFrameError;
file.hub.buildError = buildError;
file.markoOpts = file.___taglibLookup = file.___getMarkoFile = undefined;
}
metadata.marko.watchFiles = metadata.marko.watchFiles.filter(unique);
}
};
};
export function getMarkoFile(code, jsParseOptions, markoOpts) {
const { translator } = markoOpts;
let compileCache = markoOpts.cache.get(translator);
if (!compileCache) {
markoOpts.cache.set(translator, (compileCache = new Map()));
}
const filename = jsParseOptions.sourceFileName;
const id = getTemplateId(markoOpts.optimize, filename);
const contentHash = createHash("MD5")
.update(code)
.digest("hex");
const cacheKey = createHash("MD5")
.update(id)
.update(markoOpts.migrate ? "\0migrate" : "")
.digest("hex");
let cached = compileCache.get(cacheKey);
if (cached) {
if (cached.contentHash !== contentHash) {
// File content changed, invalidate the cache.
cached = undefined;
} else {
for (const watchFile of cached.file.metadata.marko.watchFiles) {
let mtime = Infinity;
try {
mtime = markoOpts.fileSystem.statSync(watchFile).mtime;
// eslint-disable-next-line no-empty
} catch {}
if (mtime > cached.time) {
// Some dependency changed, invalidate the cache.
cached = undefined;
break;
}
}
}
}
if (cached) {
return cached.file;
}
const taglibLookup = buildLookup(path.dirname(filename), translator);
const file = new MarkoFile(jsParseOptions, {
code,
ast: {
type: "File",
program: {
type: "Program",
sourceType: "module",
body: [],
directives: []
}
}
});
const meta = (file.metadata.marko = {
id,
macros: {},
deps: [],
tags: [],
watchFiles: []
});
const rootMigrators = [migrate];
const rootTransformers = [transform];
file.markoOpts = markoOpts;
file.___taglibLookup = taglibLookup;
file.___getMarkoFile = getMarkoFile;
file.ast.start = file.ast.program.start = 0;
file.ast.end = file.ast.program.end = code.length - 1;
file.ast.loc = file.ast.program.loc = {
start: { line: 0, column: 0 },
end: getLoc(file, file.ast.end)
};
parseMarko(file);
file.path.scope.crawl(); // Initialize bindings.
for (const id in taglibLookup.taglibsById) {
const { migratorPath } = taglibLookup.taglibsById[id];
if (migratorPath) {
const mod = markoModules.require(migratorPath);
meta.watchFiles.push(migratorPath);
rootMigrators.push(mod.default || mod);
}
}
for (const { path: transformerPath } of taglibLookup.merged.transformers) {
const mod = markoModules.require(transformerPath);
meta.watchFiles.push(transformerPath);
rootTransformers.push(mod.default || mod);
}
traverseAll(file, rootMigrators);
traverseAll(file, rootTransformers);
for (const taglibId in taglibLookup.taglibsById) {
const { filePath } = taglibLookup.taglibsById[taglibId];
if (
filePath[filePath.length - 5] === "." &&
filePath.endsWith("marko.json")
) {
meta.watchFiles.push(filePath);
}
}
if (translator.analyze) {
traverseAll(file, translator.analyze);
}
compileCache.set(cacheKey, {
time: Date.now(),
file,
contentHash
});
return file;
}
function shallowClone(data) {
const clone = {};
for (const key in data) {
const v = data[key];
if (v !== undefined) {
if (v === null || typeof v !== "object") {
clone[key] = v;
} else {
const Ctor = v.constructor;
switch (Ctor) {
case Array:
clone[key] = [...v];
break;
case Object:
case null:
clone[key] = { ...v };
break;
case Map:
case Set:
case Date:
case RegExp:
clone[key] = new Ctor(v);
break;
default:
throw new Error(`Unsupported metadata type of ${Ctor.name}`);
}
}
}
}
return clone;
}
function mergeVisitors(all) {
if (Array.isArray(all)) {
if (all.length === 1) {
all = all[0];
} else {
return visitors.merge(all);
}
}
return visitors.explode(all);
}
function traverseAll(file, visitors) {
const program = file.path;
const { Program, ...mergedVisitors } = mergeVisitors(visitors);
// Traverse only walks into children by default
// This manually traverses into the Program node as well.
if (!(Program && Program.enter && program._call(Program.enter))) {
program.traverse(mergedVisitors);
if (Program && Program.exit) {
program._call(Program.exit);
}
}
}
function unique(item, i, list) {
return list.indexOf(item) === i;
}
function shouldOptimize() {
return (
(process.env.MARKO_DEBUG &&
process.env.MARKO_DEBUG !== "false" &&
process.env.MARKO_DEBUG !== "0") ||
(process.env.NODE_ENV && process.env.NODE_ENV !== "development")
);
}