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Logic specific to WebInspector is removed and linting // is made to match the Node.js style guide. // Copyright 2013 the V8 project authors. All rights reserved. // Redistribution and use in source and binary forms, with or without // modification, are permitted provided that the following conditions are // met: // // * Redistributions of source code must retain the above copyright // notice, this list of conditions and the following disclaimer. // * Redistributions in binary form must reproduce the above // copyright notice, this list of conditions and the following // disclaimer in the documentation and/or other materials provided // with the distribution. // * Neither the name of Google Inc. nor the names of its // contributors may be used to endorse or promote products derived // from this software without specific prior written permission. // // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. // This is a copy from blink dev tools, see: // http://src.chromium.org/viewvc/blink/trunk/Source/devtools/front_end/SourceMap.js // revision: 153407 /* * Copyright (C) 2012 Google Inc. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are * met: * * * Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * Redistributions in binary form must reproduce the above * copyright notice, this list of conditions and the following disclaimer * in the documentation and/or other materials provided with the * distribution. * * Neither the name of Google Inc. nor the names of its * contributors may be used to endorse or promote products derived from * this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ 'use strict'; const { ArrayIsArray, ArrayPrototypePush, ArrayPrototypeSlice, ArrayPrototypeSort, ObjectPrototypeHasOwnProperty, StringPrototypeCharAt, } = primordials; const { validateObject } = require('internal/validators'); let base64Map; const VLQ_BASE_SHIFT = 5; const VLQ_BASE_MASK = (1 << 5) - 1; const VLQ_CONTINUATION_MASK = 1 << 5; class StringCharIterator { /** * @constructor * @param {string} string */ constructor(string) { this._string = string; this._position = 0; } /** * @return {string} */ next() { return StringPrototypeCharAt(this._string, this._position++); } /** * @return {string} */ peek() { return StringPrototypeCharAt(this._string, this._position); } /** * @return {boolean} */ hasNext() { return this._position < this._string.length; } } /** * Implements Source Map V3 model. * See https://github.com/google/closure-compiler/wiki/Source-Maps * for format description. */ class SourceMap { #payload; #mappings = []; #sources = {}; #sourceContentByURL = {}; /** * @constructor * @param {SourceMapV3} payload */ constructor(payload) { if (!base64Map) { const base64Digits = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'; base64Map = {}; for (let i = 0; i < base64Digits.length; ++i) base64Map[base64Digits[i]] = i; } this.#payload = cloneSourceMapV3(payload); this.#parseMappingPayload(); } /** * @return {object} raw source map v3 payload. */ get payload() { return cloneSourceMapV3(this.#payload); } #parseMappingPayload = () => { if (this.#payload.sections) { this.#parseSections(this.#payload.sections); } else { this.#parseMap(this.#payload, 0, 0); } ArrayPrototypeSort(this.#mappings, compareSourceMapEntry); }; /** * @param {Array.<SourceMapV3.Section>} sections */ #parseSections = (sections) => { for (let i = 0; i < sections.length; ++i) { const section = sections[i]; this.#parseMap(section.map, section.offset.line, section.offset.column); } }; /** * @param {number} lineNumber in compiled resource * @param {number} columnNumber in compiled resource * @return {?Array} */ findEntry(lineNumber, columnNumber) { let first = 0; let count = this.#mappings.length; while (count > 1) { const step = count >> 1; const middle = first + step; const mapping = this.#mappings[middle]; if (lineNumber < mapping[0] || (lineNumber === mapping[0] && columnNumber < mapping[1])) { count = step; } else { first = middle; count -= step; } } const entry = this.#mappings[first]; if (!first && entry && (lineNumber < entry[0] || (lineNumber === entry[0] && columnNumber < entry[1]))) { return {}; } else if (!entry) { return {}; } return { generatedLine: entry[0], generatedColumn: entry[1], originalSource: entry[2], originalLine: entry[3], originalColumn: entry[4], name: entry[5], }; } /** * @override */ #parseMap(map, lineNumber, columnNumber) { let sourceIndex = 0; let sourceLineNumber = 0; let sourceColumnNumber = 0; let nameIndex = 0; const sources = []; const originalToCanonicalURLMap = {}; for (let i = 0; i < map.sources.length; ++i) { const url = map.sources[i]; originalToCanonicalURLMap[url] = url; ArrayPrototypePush(sources, url); this.#sources[url] = true; if (map.sourcesContent && map.sourcesContent[i]) this.#sourceContentByURL[url] = map.sourcesContent[i]; } const stringCharIterator = new StringCharIterator(map.mappings); let sourceURL = sources[sourceIndex]; while (true) { if (stringCharIterator.peek() === ',') stringCharIterator.next(); else { while (stringCharIterator.peek() === ';') { lineNumber += 1; columnNumber = 0; stringCharIterator.next(); } if (!stringCharIterator.hasNext()) break; } columnNumber += decodeVLQ(stringCharIterator); if (isSeparator(stringCharIterator.peek())) { ArrayPrototypePush(this.#mappings, [lineNumber, columnNumber]); continue; } const sourceIndexDelta = decodeVLQ(stringCharIterator); if (sourceIndexDelta) { sourceIndex += sourceIndexDelta; sourceURL = sources[sourceIndex]; } sourceLineNumber += decodeVLQ(stringCharIterator); sourceColumnNumber += decodeVLQ(stringCharIterator); let name; if (!isSeparator(stringCharIterator.peek())) { nameIndex += decodeVLQ(stringCharIterator); name = map.names?.[nameIndex]; } ArrayPrototypePush( this.#mappings, [lineNumber, columnNumber, sourceURL, sourceLineNumber, sourceColumnNumber, name] ); } } } /** * @param {string} char * @return {boolean} */ function isSeparator(char) { return char === ',' || char === ';'; } /** * @param {SourceMap.StringCharIterator} stringCharIterator * @return {number} */ function decodeVLQ(stringCharIterator) { // Read unsigned value. let result = 0; let shift = 0; let digit; do { digit = base64Map[stringCharIterator.next()]; result += (digit & VLQ_BASE_MASK) << shift; shift += VLQ_BASE_SHIFT; } while (digit & VLQ_CONTINUATION_MASK); // Fix the sign. const negative = result & 1; // Use unsigned right shift, so that the 32nd bit is properly shifted to the // 31st, and the 32nd becomes unset. result >>>= 1; if (!negative) { return result; } // We need to OR here to ensure the 32nd bit (the sign bit in an Int32) is // always set for negative numbers. If `result` were 1, (meaning `negate` is // true and all other bits were zeros), `result` would now be 0. But -0 // doesn't flip the 32nd bit as intended. All other numbers will successfully // set the 32nd bit without issue, so doing this is a noop for them. return -result | (1 << 31); } /** * @param {SourceMapV3} payload * @return {SourceMapV3} */ function cloneSourceMapV3(payload) { validateObject(payload, 'payload'); payload = { ...payload }; for (const key in payload) { if (ObjectPrototypeHasOwnProperty(payload, key) && ArrayIsArray(payload[key])) { payload[key] = ArrayPrototypeSlice(payload[key]); } } return payload; } /** * @param {Array} entry1 source map entry [lineNumber, columnNumber, sourceURL, * sourceLineNumber, sourceColumnNumber] * @param {Array} entry2 source map entry. * @return {number} */ function compareSourceMapEntry(entry1, entry2) { const { 0: lineNumber1, 1: columnNumber1 } = entry1; const { 0: lineNumber2, 1: columnNumber2 } = entry2; if (lineNumber1 !== lineNumber2) { return lineNumber1 - lineNumber2; } return columnNumber1 - columnNumber2; } module.exports = { SourceMap }; |