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import { push_array } from './push_array.js'; /** * @param {string} s */ function last_line_length(s) { return s.length - s.lastIndexOf('\n') - 1; } // mutate map in-place /** * @param {DecodedSourceMap} map * @param {{ line: number; column: number; }} offset * @param {number} source_index */ export function sourcemap_add_offset(map, offset, source_index) { if (map.mappings.length == 0) return; for (let line = 0; line < map.mappings.length; line++) { const segment_list = map.mappings[line]; for (let segment = 0; segment < segment_list.length; segment++) { const seg = segment_list[segment]; // shift only segments that belong to component source file if (seg[1] === source_index) { // also ensures that seg.length >= 4 // shift column if it points at the first line if (seg[2] === 0) { /** @type {any} */ (seg[3]) += offset.column; } // shift line /** @type {any} */ (seg[2]) += offset.line; } } } } /** * @template T * @param {T[]} this_table * @param {T[]} other_table * @returns {[T[], number[], boolean, boolean]} */ function merge_tables(this_table, other_table) { const new_table = this_table.slice(); const idx_map = []; other_table = other_table || []; let val_changed = false; for (const [other_idx, other_val] of other_table.entries()) { const this_idx = this_table.indexOf(other_val); if (this_idx >= 0) { idx_map[other_idx] = this_idx; } else { const new_idx = new_table.length; new_table[new_idx] = other_val; idx_map[other_idx] = new_idx; val_changed = true; } } let idx_changed = val_changed; if (val_changed) { if (idx_map.find((val, idx) => val != idx) === undefined) { // idx_map is identity map [0, 1, 2, 3, 4, ....] idx_changed = false; } } return [new_table, idx_map, val_changed, idx_changed]; } const regex_line_token = /([^\w\s]|\s+)/g; /** */ export class MappedCode { /** * @type {string} */ string = /** @type {any} */ (undefined); /** * @type {DecodedSourceMap} */ map = /** @type {any} */ (undefined); /** * @param {string} string * @param {DecodedSourceMap | null} map */ constructor(string = '', map = null) { this.string = string; if (map) { this.map = map; } else { this.map = { version: 3, mappings: [], sources: [], names: [] }; } } /** * concat in-place (mutable), return this (chainable) * will also mutate the `other` object * @param {MappedCode} other * @returns {MappedCode} */ concat(other) { // noop: if one is empty, return the other if (other.string == '') return this; if (this.string == '') { this.string = other.string; this.map = other.map; return this; } // compute last line length before mutating const column_offset = last_line_length(this.string); this.string += other.string; const m1 = this.map; const m2 = other.map; if (m2.mappings.length == 0) return this; // combine sources and names const [sources, new_source_idx, sources_changed, sources_idx_changed] = merge_tables( m1.sources, m2.sources ); const [names, new_name_idx, names_changed, names_idx_changed] = merge_tables( m1.names, m2.names ); if (sources_changed) m1.sources = sources; if (names_changed) m1.names = names; // unswitched loops are faster if (sources_idx_changed && names_idx_changed) { for (let line = 0; line < m2.mappings.length; line++) { const segment_list = m2.mappings[line]; for (let segment = 0; segment < segment_list.length; segment++) { const seg = segment_list[segment]; // @ts-ignore if (seg[1] >= 0) seg[1] = new_source_idx[seg[1]]; // @ts-ignore if (seg[4] >= 0) seg[4] = new_name_idx[seg[4]]; } } } else if (sources_idx_changed) { for (let line = 0; line < m2.mappings.length; line++) { const segment_list = m2.mappings[line]; for (let segment = 0; segment < segment_list.length; segment++) { const seg = segment_list[segment]; // @ts-ignore if (seg[1] >= 0) seg[1] = new_source_idx[seg[1]]; } } } else if (names_idx_changed) { for (let line = 0; line < m2.mappings.length; line++) { const segment_list = m2.mappings[line]; for (let segment = 0; segment < segment_list.length; segment++) { const seg = segment_list[segment]; // @ts-ignore if (seg[4] >= 0) seg[4] = new_name_idx[seg[4]]; } } } // combine the mappings // combine // 1. last line of first map // 2. first line of second map // columns of 2 must be shifted if (m2.mappings.length > 0 && column_offset > 0) { const first_line = m2.mappings[0]; for (let i = 0; i < first_line.length; i++) { first_line[i][0] += column_offset; } } // combine last line + first line push_array( m1.mappings[m1.mappings.length - 1], /** @type {SourceMapSegment[]} */ (m2.mappings.shift()) ); // append other lines push_array(m1.mappings, m2.mappings); return this; } /** * @static * @param {string} string * @param {DecodedSourceMap} [map] * @returns {MappedCode} */ static from_processed(string, map) { const line_count = string.split('\n').length; if (map) { // ensure that count of source map mappings lines // is equal to count of generated code lines // (some tools may produce less) const missing_lines = line_count - map.mappings.length; for (let i = 0; i < missing_lines; i++) { map.mappings.push([]); } return new MappedCode(string, map); } if (string == '') return new MappedCode(); map = { version: 3, names: [], sources: [], mappings: [] }; // add empty SourceMapSegment[] for every line for (let i = 0; i < line_count; i++) map.mappings.push([]); return new MappedCode(string, map); } /** * @static * @param {Source} opts * @returns {MappedCode} */ static from_source({ source, file_basename, get_location }) { /** * @type {{ line: number; column: number; }} */ let offset = get_location(0); if (!offset) offset = { line: 0, column: 0 }; /** * @type {DecodedSourceMap} */ const map = { version: 3, names: [], sources: [file_basename], mappings: [] }; if (source == '') return new MappedCode(source, map); // we create a high resolution identity map here, // we know that it will eventually be merged with svelte's map, // at which stage the resolution will decrease. const line_list = source.split('\n'); for (let line = 0; line < line_list.length; line++) { map.mappings.push([]); const token_list = line_list[line].split(regex_line_token); for (let token = 0, column = 0; token < token_list.length; token++) { if (token_list[token] == '') continue; map.mappings[line].push([column, 0, offset.line + line, column]); column += token_list[token].length; } } // shift columns in first line const segment_list = map.mappings[0]; for (let segment = 0; segment < segment_list.length; segment++) { // @ts-ignore segment_list[segment][3] += offset.column; } return new MappedCode(source, map); } } // browser vs node.js const b64enc = typeof window !== 'undefined' && typeof btoa === 'function' ? /** @param {string} str */ (str) => btoa(unescape(encodeURIComponent(str))) : /** @param {string} str */ (str) => Buffer.from(str).toString('base64'); const b64dec = typeof window !== 'undefined' && typeof atob === 'function' ? atob : /** @param {any} a */ (a) => Buffer.from(a, 'base64').toString(); /** * @param {string} filename Basename of the input file * @param {Array<DecodedSourceMap | RawSourceMap>} sourcemap_list */ export function combine_sourcemaps(filename, sourcemap_list) { if (sourcemap_list.length == 0) return null; let map_idx = 1; const map = sourcemap_list.slice(0, -1).find((m) => m.sources.length !== 1) === undefined ? remapping( // use array interface // only the oldest sourcemap can have multiple sources sourcemap_list, () => null, true // skip optional field `sourcesContent` ) : remapping( // use loader interface sourcemap_list[0], // last map (sourcefile) => { // TODO the equality check assumes that the preprocessor map has the input file as a relative path in sources, // e.g. when the input file is `src/foo/bar.svelte`, then sources is expected to contain just `bar.svelte`. // Therefore filename also needs to be the basename of the path. This feels brittle, investigate how we can // harden this (without breaking other tooling that assumes this behavior). if (sourcefile === filename && sourcemap_list[map_idx]) { return sourcemap_list[map_idx++]; // idx 1, 2, ... // bundle file = branch node } else { return null; // source file = leaf node } }, true ); if (!map.file) delete map.file; // skip optional field `file` // When source maps are combined and the leading map is empty, sources is not set. // Add the filename to the empty array in this case. // Further improvements to remapping may help address this as well https://github.com/ampproject/remapping/issues/116 if (!map.sources.length) map.sources = [filename]; return map; } /** * @param {string} filename * @param {SourceMap} svelte_map * @param {string | DecodedSourceMap | RawSourceMap} preprocessor_map_input * @returns {SourceMap} */ function apply_preprocessor_sourcemap(filename, svelte_map, preprocessor_map_input) { if (!svelte_map || !preprocessor_map_input) return svelte_map; const preprocessor_map = typeof preprocessor_map_input === 'string' ? JSON.parse(preprocessor_map_input) : preprocessor_map_input; const result_map = combine_sourcemaps(filename, [svelte_map, preprocessor_map]); // Svelte expects a SourceMap which includes toUrl and toString. Instead of wrapping our output in a class, // we just tack on the extra properties. Object.defineProperties(result_map, { toString: { enumerable: false, value: function toString() { return JSON.stringify(this); } }, toUrl: { enumerable: false, value: function toUrl() { return 'data:application/json;charset=utf-8;base64,' + b64enc(this.toString()); } } }); return /** @type {any} */ (result_map); } const regex_data_uri = /data:(?:application|text)\/json;(?:charset[:=]\S+?;)?base64,(\S*)/; // parse attached sourcemap in processed.code /** * @param {Processed} processed * @param {'script' | 'style'} tag_name * @returns {void} */ export function parse_attached_sourcemap(processed, tag_name) { const r_in = '[#@]\\s*sourceMappingURL\\s*=\\s*(\\S*)'; const regex = tag_name == 'script' ? new RegExp('(?://' + r_in + ')|(?:/\\*' + r_in + '\\s*\\*/)$') : new RegExp('/\\*' + r_in + '\\s*\\*/$'); /** * @param {any} message */ function log_warning(message) { // code_start: help to find preprocessor const code_start = processed.code.length < 100 ? processed.code : processed.code.slice(0, 100) + ' [...]'; // eslint-disable-next-line no-console console.warn(`warning: ${message}. processed.code = ${JSON.stringify(code_start)}`); } processed.code = processed.code.replace(regex, (_, match1, match2) => { const map_url = tag_name == 'script' ? match1 || match2 : match1; const map_data = (map_url.match(regex_data_uri) || [])[1]; if (map_data) { // sourceMappingURL is data URL if (processed.map) { log_warning( 'Not implemented. ' + 'Found sourcemap in both processed.code and processed.map. ' + 'Please update your preprocessor to return only one sourcemap.' ); // ignore attached sourcemap return ''; } processed.map = b64dec(map_data); // use attached sourcemap return ''; // remove from processed.code } // sourceMappingURL is path or URL if (!processed.map) { log_warning( `Found sourcemap path ${JSON.stringify( map_url )} in processed.code, but no sourcemap data. ` + 'Please update your preprocessor to return sourcemap data directly.' ); } // ignore sourcemap path return ''; // remove from processed.code }); } /** * @param {{ code: string, map: SourceMap}} result * @param {ValidatedCompileOptions} options * @param {string} source_name */ export function merge_with_preprocessor_map(result, options, source_name) { if (options.sourcemap) { const file_basename = get_basename(options.filename); // The preprocessor map is expected to contain `sources: [basename_of_filename]`, but our own // map may contain a different file name. Patch our map beforehand to align sources so merging // with the preprocessor map works correctly. result.map.sources = [file_basename]; result.map = apply_preprocessor_sourcemap( file_basename, result.map, /** @type {any} */ (options.sourcemap) ); // After applying the preprocessor map, we need to do the inverse and make the sources // relative to the input file again in case the output code is in a different directory. if (file_basename !== source_name) { result.map.sources = result.map.sources.map( /** @param {string} source */ (source) => get_relative_path(source_name, source) ); } } } /** * @param {string} from * @param {string} to */ function get_relative_path(from, to) { // Don't use node's utils here to ensure the compiler is usable in a browser environment const from_parts = from.split(/[/\\]/); const to_parts = to.split(/[/\\]/); from_parts.pop(); // get dirname while (from_parts[0] === to_parts[0]) { from_parts.shift(); to_parts.shift(); } if (from_parts.length) { let i = from_parts.length; while (i--) from_parts[i] = '..'; } return from_parts.concat(to_parts).join('/'); } /** * Like node's `basename`, but doesn't use it to ensure the compiler is usable in a browser environment * @param {string} filename */ export function get_basename(filename) { return /** @type {string} */ (filename.split(/[/\\]/).pop()); } /** * @param {string} filename * @param {string | undefined} output_filename * @param {string} fallback */ export function get_source_name(filename, output_filename, fallback) { return output_filename ? get_relative_path(output_filename, filename) : get_basename(filename); } |