aaeebfaf00
option-manager.js... /babel-core/src/config/ build-external-helpers.js... /packages/babel-core/src/tools/ index.js... /packages/babel-generator/src
108 lines
2.7 KiB
JavaScript
108 lines
2.7 KiB
JavaScript
import SourceMap from "./source-map";
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import Printer, { type Format } from "./printer";
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/**
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* Babel's code generator, turns an ast into code, maintaining sourcemaps,
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* user preferences, and valid output.
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*/
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class Generator extends Printer {
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constructor(ast, opts = {}, code) {
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const format = normalizeOptions(code, opts);
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const map = opts.sourceMaps ? new SourceMap(opts, code) : null;
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super(format, map);
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this.ast = ast;
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}
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ast: Object;
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/**
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* Generate code and sourcemap from ast.
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*
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* Appends comments that weren't attached to any node to the end of the generated output.
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*/
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generate() {
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return super.generate(this.ast);
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}
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}
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/**
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* Normalize generator options, setting defaults.
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*
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* - Detects code indentation.
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* - If `opts.compact = "auto"` and the code is over 500KB, `compact` will be set to `true`.
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*/
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function normalizeOptions(code, opts): Format {
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const format = {
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auxiliaryCommentBefore: opts.auxiliaryCommentBefore,
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auxiliaryCommentAfter: opts.auxiliaryCommentAfter,
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shouldPrintComment: opts.shouldPrintComment,
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retainLines: opts.retainLines,
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retainFunctionParens: opts.retainFunctionParens,
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comments: opts.comments == null || opts.comments,
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compact: opts.compact,
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minified: opts.minified,
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concise: opts.concise,
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quotes: "double",
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jsonCompatibleStrings: opts.jsonCompatibleStrings,
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indent: {
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adjustMultilineComment: true,
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style: " ",
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base: 0,
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},
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};
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if (format.minified) {
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format.compact = true;
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format.shouldPrintComment =
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format.shouldPrintComment || (() => format.comments);
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} else {
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format.shouldPrintComment =
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format.shouldPrintComment ||
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(value =>
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format.comments ||
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(value.indexOf("@license") >= 0 || value.indexOf("@preserve") >= 0));
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}
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if (format.compact === "auto") {
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format.compact = code.length > 500_000; // 500KB
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if (format.compact) {
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console.error(
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`[BABEL] Note: The code generator has deoptimised the styling of ${opts.filename},
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it exceeds the max of 500KB.`,
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);
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}
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}
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if (format.compact) {
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format.indent.adjustMultilineComment = false;
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}
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return format;
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}
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/**
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* We originally exported the Generator class above, but to make it extra clear that it is a private API,
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* we have moved that to an internal class instance and simplified the interface to the two public methods
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* that we wish to support.
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*/
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export class CodeGenerator {
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constructor(ast, opts, code) {
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this._generator = new Generator(ast, opts, code);
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}
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generate() {
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return this._generator.generate();
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}
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}
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export default function(ast: Object, opts: Object, code: string): Object {
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const gen = new Generator(ast, opts, code);
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return gen.generate();
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}
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