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node_modules/source-map-js/lib/base64-vlq.js
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node_modules/source-map-js/lib/base64-vlq.js
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/* -*- Mode: js; js-indent-level: 2; -*- */
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/*
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* Copyright 2011 Mozilla Foundation and contributors
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* Licensed under the New BSD license. See LICENSE or:
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* http://opensource.org/licenses/BSD-3-Clause
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*
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* Based on the Base 64 VLQ implementation in Closure Compiler:
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* https://code.google.com/p/closure-compiler/source/browse/trunk/src/com/google/debugging/sourcemap/Base64VLQ.java
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*
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* Copyright 2011 The Closure Compiler Authors. All rights reserved.
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials provided
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* with the distribution.
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* * Neither the name of Google Inc. nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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var base64 = require('./base64');
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// A single base 64 digit can contain 6 bits of data. For the base 64 variable
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// length quantities we use in the source map spec, the first bit is the sign,
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// the next four bits are the actual value, and the 6th bit is the
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// continuation bit. The continuation bit tells us whether there are more
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// digits in this value following this digit.
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//
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// Continuation
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// | Sign
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// | |
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// V V
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// 101011
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var VLQ_BASE_SHIFT = 5;
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// binary: 100000
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var VLQ_BASE = 1 << VLQ_BASE_SHIFT;
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// binary: 011111
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var VLQ_BASE_MASK = VLQ_BASE - 1;
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// binary: 100000
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var VLQ_CONTINUATION_BIT = VLQ_BASE;
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/**
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* Converts from a two-complement value to a value where the sign bit is
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* placed in the least significant bit. For example, as decimals:
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* 1 becomes 2 (10 binary), -1 becomes 3 (11 binary)
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* 2 becomes 4 (100 binary), -2 becomes 5 (101 binary)
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*/
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function toVLQSigned(aValue) {
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return aValue < 0
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? ((-aValue) << 1) + 1
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: (aValue << 1) + 0;
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}
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/**
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* Converts to a two-complement value from a value where the sign bit is
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* placed in the least significant bit. For example, as decimals:
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* 2 (10 binary) becomes 1, 3 (11 binary) becomes -1
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* 4 (100 binary) becomes 2, 5 (101 binary) becomes -2
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*/
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function fromVLQSigned(aValue) {
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var isNegative = (aValue & 1) === 1;
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var shifted = aValue >> 1;
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return isNegative
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? -shifted
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: shifted;
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}
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/**
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* Returns the base 64 VLQ encoded value.
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*/
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exports.encode = function base64VLQ_encode(aValue) {
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var encoded = "";
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var digit;
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var vlq = toVLQSigned(aValue);
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do {
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digit = vlq & VLQ_BASE_MASK;
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vlq >>>= VLQ_BASE_SHIFT;
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if (vlq > 0) {
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// There are still more digits in this value, so we must make sure the
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// continuation bit is marked.
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digit |= VLQ_CONTINUATION_BIT;
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}
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encoded += base64.encode(digit);
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} while (vlq > 0);
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return encoded;
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};
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/**
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* Decodes the next base 64 VLQ value from the given string and returns the
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* value and the rest of the string via the out parameter.
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*/
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exports.decode = function base64VLQ_decode(aStr, aIndex, aOutParam) {
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var strLen = aStr.length;
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var result = 0;
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var shift = 0;
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var continuation, digit;
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do {
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if (aIndex >= strLen) {
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throw new Error("Expected more digits in base 64 VLQ value.");
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}
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digit = base64.decode(aStr.charCodeAt(aIndex++));
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if (digit === -1) {
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throw new Error("Invalid base64 digit: " + aStr.charAt(aIndex - 1));
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}
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continuation = !!(digit & VLQ_CONTINUATION_BIT);
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digit &= VLQ_BASE_MASK;
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result = result + (digit << shift);
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shift += VLQ_BASE_SHIFT;
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} while (continuation);
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aOutParam.value = fromVLQSigned(result);
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aOutParam.rest = aIndex;
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};
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111
node_modules/source-map-js/lib/binary-search.js
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node_modules/source-map-js/lib/binary-search.js
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/* -*- Mode: js; js-indent-level: 2; -*- */
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/*
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* Copyright 2011 Mozilla Foundation and contributors
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* Licensed under the New BSD license. See LICENSE or:
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* http://opensource.org/licenses/BSD-3-Clause
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*/
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exports.GREATEST_LOWER_BOUND = 1;
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exports.LEAST_UPPER_BOUND = 2;
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/**
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* Recursive implementation of binary search.
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*
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* @param aLow Indices here and lower do not contain the needle.
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* @param aHigh Indices here and higher do not contain the needle.
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* @param aNeedle The element being searched for.
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* @param aHaystack The non-empty array being searched.
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* @param aCompare Function which takes two elements and returns -1, 0, or 1.
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* @param aBias Either 'binarySearch.GREATEST_LOWER_BOUND' or
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* 'binarySearch.LEAST_UPPER_BOUND'. Specifies whether to return the
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* closest element that is smaller than or greater than the one we are
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* searching for, respectively, if the exact element cannot be found.
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*/
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function recursiveSearch(aLow, aHigh, aNeedle, aHaystack, aCompare, aBias) {
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// This function terminates when one of the following is true:
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//
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// 1. We find the exact element we are looking for.
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//
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// 2. We did not find the exact element, but we can return the index of
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// the next-closest element.
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//
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// 3. We did not find the exact element, and there is no next-closest
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// element than the one we are searching for, so we return -1.
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var mid = Math.floor((aHigh - aLow) / 2) + aLow;
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var cmp = aCompare(aNeedle, aHaystack[mid], true);
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if (cmp === 0) {
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// Found the element we are looking for.
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return mid;
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}
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else if (cmp > 0) {
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// Our needle is greater than aHaystack[mid].
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if (aHigh - mid > 1) {
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// The element is in the upper half.
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return recursiveSearch(mid, aHigh, aNeedle, aHaystack, aCompare, aBias);
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}
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// The exact needle element was not found in this haystack. Determine if
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// we are in termination case (3) or (2) and return the appropriate thing.
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if (aBias == exports.LEAST_UPPER_BOUND) {
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return aHigh < aHaystack.length ? aHigh : -1;
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} else {
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return mid;
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}
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}
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else {
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// Our needle is less than aHaystack[mid].
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if (mid - aLow > 1) {
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// The element is in the lower half.
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return recursiveSearch(aLow, mid, aNeedle, aHaystack, aCompare, aBias);
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}
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// we are in termination case (3) or (2) and return the appropriate thing.
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if (aBias == exports.LEAST_UPPER_BOUND) {
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return mid;
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} else {
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return aLow < 0 ? -1 : aLow;
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}
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}
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}
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/**
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* This is an implementation of binary search which will always try and return
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* the index of the closest element if there is no exact hit. This is because
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* mappings between original and generated line/col pairs are single points,
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* and there is an implicit region between each of them, so a miss just means
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* that you aren't on the very start of a region.
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*
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* @param aNeedle The element you are looking for.
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* @param aHaystack The array that is being searched.
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* @param aCompare A function which takes the needle and an element in the
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* array and returns -1, 0, or 1 depending on whether the needle is less
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* than, equal to, or greater than the element, respectively.
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* @param aBias Either 'binarySearch.GREATEST_LOWER_BOUND' or
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* 'binarySearch.LEAST_UPPER_BOUND'. Specifies whether to return the
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* closest element that is smaller than or greater than the one we are
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* searching for, respectively, if the exact element cannot be found.
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* Defaults to 'binarySearch.GREATEST_LOWER_BOUND'.
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*/
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exports.search = function search(aNeedle, aHaystack, aCompare, aBias) {
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if (aHaystack.length === 0) {
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return -1;
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}
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var index = recursiveSearch(-1, aHaystack.length, aNeedle, aHaystack,
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aCompare, aBias || exports.GREATEST_LOWER_BOUND);
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if (index < 0) {
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return -1;
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}
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// We have found either the exact element, or the next-closest element than
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// the one we are searching for. However, there may be more than one such
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// element. Make sure we always return the smallest of these.
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while (index - 1 >= 0) {
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if (aCompare(aHaystack[index], aHaystack[index - 1], true) !== 0) {
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break;
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}
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--index;
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}
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return index;
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};
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