diff options
| author | littleblack111 <littleblack11111@gmail.com> | 2023-10-31 15:37:35 +0800 |
|---|---|---|
| committer | littleblack111 <littleblack11111@gmail.com> | 2023-10-31 15:37:35 +0800 |
| commit | d5f14083061f2ce6a42313188443a42e30796320 (patch) | |
| tree | cc6a9889e08b29595a76a33b9e7b4ef84866468b /node_modules/webpack/lib/util/binarySearchBounds.js | |
| parent | b1a6ea021f29f182b62f9f81024a3d8ac8621b7f (diff) | |
added make browserlist(autoprefixer) work fixed
Diffstat (limited to 'node_modules/webpack/lib/util/binarySearchBounds.js')
| -rw-r--r-- | node_modules/webpack/lib/util/binarySearchBounds.js | 135 |
1 files changed, 135 insertions, 0 deletions
diff --git a/node_modules/webpack/lib/util/binarySearchBounds.js b/node_modules/webpack/lib/util/binarySearchBounds.js new file mode 100644 index 00000000..af04daa1 --- /dev/null +++ b/node_modules/webpack/lib/util/binarySearchBounds.js @@ -0,0 +1,135 @@ +/* + MIT License http://www.opensource.org/licenses/mit-license.php + Author Mikola Lysenko @mikolalysenko +*/ + +"use strict"; + +/* cspell:disable-next-line */ +// Refactor: Peter Somogyvari @petermetz + +/** @typedef {">=" | "<=" | "<" | ">" | "-" } BinarySearchPredicate */ +/** @typedef {"GE" | "GT" | "LT" | "LE" | "EQ" } SearchPredicateSuffix */ + +/** + * Helper function for compiling binary search functions. + * + * The generated code uses a while loop to repeatedly divide the search interval + * in half until the desired element is found, or the search interval is empty. + * + * The following is an example of a generated function for calling `compileSearch("P", "c(x,y)<=0", true, ["y", "c"], false)`: + * + * ```js + * function P(a,l,h,y,c){var i=l-1;while(l<=h){var m=(l+h)>>>1,x=a[m];if(c(x,y)<=0){i=m;l=m+1}else{h=m-1}}return i}; + * ``` + * + * @param {string} funcName The name of the function to be compiled. + * @param {string} predicate The predicate / comparison operator to be used in the binary search. + * @param {boolean} reversed Whether the search should be reversed. + * @param {string[]} extraArgs Extra arguments to be passed to the function. + * @param {boolean=} earlyOut Whether the search should return as soon as a match is found. + * @returns {string} The compiled binary search function. + */ +const compileSearch = (funcName, predicate, reversed, extraArgs, earlyOut) => { + const code = [ + "function ", + funcName, + "(a,l,h,", + extraArgs.join(","), + "){", + earlyOut ? "" : "var i=", + reversed ? "l-1" : "h+1", + ";while(l<=h){var m=(l+h)>>>1,x=a[m]" + ]; + + if (earlyOut) { + if (predicate.indexOf("c") < 0) { + code.push(";if(x===y){return m}else if(x<=y){"); + } else { + code.push(";var p=c(x,y);if(p===0){return m}else if(p<=0){"); + } + } else { + code.push(";if(", predicate, "){i=m;"); + } + if (reversed) { + code.push("l=m+1}else{h=m-1}"); + } else { + code.push("h=m-1}else{l=m+1}"); + } + code.push("}"); + if (earlyOut) { + code.push("return -1};"); + } else { + code.push("return i};"); + } + return code.join(""); +}; + +/** + * This helper functions generate code for two binary search functions: + * A(): Performs a binary search on an array using the comparison operator specified. + * P(): Performs a binary search on an array using a _custom comparison function_ + * `c(x,y)` **and** comparison operator specified by `predicate`. + * + * @param {BinarySearchPredicate} predicate The predicate / comparison operator to be used in the binary search. + * @param {boolean} reversed Whether the search should be reversed. + * @param {SearchPredicateSuffix} suffix The suffix to be used in the function name. + * @param {boolean=} earlyOut Whether the search should return as soon as a match is found. + * @returns {function} The compiled binary search function. + */ +const compileBoundsSearch = (predicate, reversed, suffix, earlyOut) => { + const arg1 = compileSearch( + "A", + "x" + predicate + "y", + reversed, + ["y"], + earlyOut + ); + + const arg2 = compileSearch( + "P", + "c(x,y)" + predicate + "0", + reversed, + ["y", "c"], + earlyOut + ); + + const fnHeader = "function dispatchBinarySearch"; + + const fnBody = + "(a,y,c,l,h){\ +if(typeof(c)==='function'){\ +return P(a,(l===void 0)?0:l|0,(h===void 0)?a.length-1:h|0,y,c)\ +}else{\ +return A(a,(c===void 0)?0:c|0,(l===void 0)?a.length-1:l|0,y)\ +}}\ +return dispatchBinarySearch"; + + const fnArgList = [arg1, arg2, fnHeader, suffix, fnBody, suffix]; + const fnSource = fnArgList.join(""); + const result = new Function(fnSource); + return result(); +}; + +/** + * These functions are used to perform binary searches on arrays. + * + * @example + * ```js + * const { gt, le} = require("./binarySearchBounds"); + * const arr = [1, 2, 3, 4, 5, 6, 7, 8, 9]; + * + * // Find the index of the first element greater than 5 + * const index1 = gt(arr, 5); // index1 === 3 + * + * // Find the index of the first element less than or equal to 5 + * const index2 = le(arr, 5); // index2 === 4 + * ``` + */ +module.exports = { + ge: compileBoundsSearch(">=", false, "GE"), + gt: compileBoundsSearch(">", false, "GT"), + lt: compileBoundsSearch("<", true, "LT"), + le: compileBoundsSearch("<=", true, "LE"), + eq: compileBoundsSearch("-", true, "EQ", true) +}; |
