101 lines
3.1 KiB
JavaScript
101 lines
3.1 KiB
JavaScript
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import remapping from '@ampproject/remapping';
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import MagicString, { SourceMap } from 'magic-string';
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class MagicStringStack {
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constructor(content, _options) {
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this._options = _options;
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this._current = new MagicString(content, this._options);
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this._stack.unshift(this._current);
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const proxy = new Proxy(new MagicString(""), {
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get: (_, p, receiver) => {
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if (Reflect.has(this, p))
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return Reflect.get(this, p, receiver);
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const parent = Reflect.get(this._current, p, receiver);
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if (typeof parent === "function") {
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return (...args) => {
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const result = parent.apply(this._current, args);
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if (result === this._current)
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return proxy;
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return result;
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};
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}
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return parent;
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},
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set: (_, p, value) => {
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if (Reflect.has(this, p))
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return Reflect.set(this, p, value, this);
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return Reflect.set(this._current, p, value);
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}
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});
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return proxy;
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}
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/**
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* The stack of MagicString instances.
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* Lastest instance is pushed to the front of the array.
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*/
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_stack = [];
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/**
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* Prepresents the current MagicString instance.
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* It should be in the this._stack[0]
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*/
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_current;
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/**
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* Commit current changes and reset the `.original` property and the indices.
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*
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* When running `generateMap`, the sourcemaps will be generated and merged into a single sourcemap.
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*/
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commit() {
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const newOne = new MagicString(this._current.toString(), this._options);
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newOne.offset = this._current.offset;
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this._current = newOne;
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this._stack.unshift(newOne);
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return this;
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}
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/**
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* Rollback to the previous commit.
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*/
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rollback() {
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if (this._stack.length <= 1)
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throw new Error("Cannot rollback on the first commit");
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this._stack.shift();
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this._current = this._stack[0];
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return this;
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}
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get original() {
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return this._current.original;
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}
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toString() {
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return this._current.toString();
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}
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clone() {
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const s = new MagicStringStack(this._current.toString(), this._options);
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s._stack = this._stack.map((s2) => s2.clone());
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s._current = s._stack[0];
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return s;
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}
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/**
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* Generates a version 3 sourcemap.
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*/
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generateMap(options) {
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return new SourceMap(this.generateDecodedMap(options));
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}
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/**
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* Generates a sourcemap object with raw mappings in array form, rather than encoded as a string.
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* Useful if you need to manipulate the sourcemap further, but most of the time you will use `generateMap` instead.
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*/
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generateDecodedMap(options) {
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if (this._stack.length === 1)
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return this._current.generateDecodedMap(options);
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const SOURCE_PLACEHOLDER = "__magic_string_placeholder__.js";
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const maps = this._stack.map((s) => s.generateDecodedMap({ source: SOURCE_PLACEHOLDER, ...options }));
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const merged = remapping(maps, () => null, { decodedMappings: true });
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merged.sources = merged.sources.map((source) => source === SOURCE_PLACEHOLDER ? "" : source);
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delete merged.version;
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return {
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...merged
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};
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}
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}
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export { MagicStringStack as default };
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