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128 lines
2.6 KiB
128 lines
2.6 KiB
/**
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* Copyright (c) Meta Platforms, Inc. and affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*
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* @flow
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* @format
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*/
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'use strict';
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import type {IndexMap, IndexMapSection, MixedSourceMap} from './source-map';
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const EMPTY_MAP = {
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version: 3,
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sources: [],
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names: [],
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mappings: 'A',
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};
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/**
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* Builds a source-mapped bundle by concatenating strings and their
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* corresponding source maps (if any).
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*
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* Usage:
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*
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* const builder = new BundleBuilder('bundle.js');
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* builder
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* .append('foo\n', fooMap)
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* .append('bar\n')
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* // ...
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* const code = builder.getCode();
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* const map = builder.getMap();
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*/
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class BundleBuilder {
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_file: string;
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_sections: Array<IndexMapSection>;
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_line: number;
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_column: number;
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_code: string;
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_afterMappedContent: boolean;
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constructor(file: string) {
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this._file = file;
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this._sections = [];
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this._line = 0;
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this._column = 0;
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this._code = '';
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this._afterMappedContent = false;
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}
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_pushMapSection(map: MixedSourceMap) {
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this._sections.push({
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map,
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offset: {column: this._column, line: this._line},
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});
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}
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_endMappedContent() {
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if (this._afterMappedContent) {
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this._pushMapSection(EMPTY_MAP);
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this._afterMappedContent = false;
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}
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}
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append(code: string, map: ?MixedSourceMap): this {
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if (!code.length) {
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return this;
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}
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const {lineBreaks, lastLineColumns} = measureString(code);
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if (map) {
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this._pushMapSection(map);
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this._afterMappedContent = true;
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} else {
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this._endMappedContent();
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}
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this._afterMappedContent = !!map;
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this._line = this._line + lineBreaks;
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if (lineBreaks > 0) {
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this._column = lastLineColumns;
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} else {
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this._column = this._column + lastLineColumns;
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}
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this._code = this._code + code;
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return this;
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}
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getMap(): MixedSourceMap {
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this._endMappedContent();
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return createIndexMap(this._file, this._sections);
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}
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getCode(): string {
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return this._code;
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}
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}
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const reLineBreak = /\r\n|\r|\n/g;
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function measureString(str: string): {
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lineBreaks: number,
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lastLineColumns: number,
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} {
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let lineBreaks = 0;
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let match;
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let lastLineStart = 0;
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while ((match = reLineBreak.exec(str))) {
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++lineBreaks;
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lastLineStart = match.index + match[0].length;
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}
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const lastLineColumns = str.length - lastLineStart;
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return {lineBreaks, lastLineColumns};
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}
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function createIndexMap(
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file: string,
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sections: Array<IndexMapSection>,
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): IndexMap {
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return {
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version: 3,
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file,
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sections,
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};
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}
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module.exports = {BundleBuilder, createIndexMap};
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