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238 lines
8.1 KiB
238 lines
8.1 KiB
/**
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* @fileoverview `IgnorePattern` class.
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*
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* `IgnorePattern` class has the set of glob patterns and the base path.
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*
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* It provides two static methods.
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*
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* - `IgnorePattern.createDefaultIgnore(cwd)`
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* Create the default predicate function.
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* - `IgnorePattern.createIgnore(ignorePatterns)`
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* Create the predicate function from multiple `IgnorePattern` objects.
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*
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* It provides two properties and a method.
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*
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* - `patterns`
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* The glob patterns that ignore to lint.
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* - `basePath`
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* The base path of the glob patterns. If absolute paths existed in the
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* glob patterns, those are handled as relative paths to the base path.
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* - `getPatternsRelativeTo(basePath)`
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* Get `patterns` as modified for a given base path. It modifies the
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* absolute paths in the patterns as prepending the difference of two base
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* paths.
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*
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* `ConfigArrayFactory` creates `IgnorePattern` objects when it processes
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* `ignorePatterns` properties.
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*
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* @author Toru Nagashima <https://github.com/mysticatea>
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*/
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//------------------------------------------------------------------------------
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// Requirements
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//------------------------------------------------------------------------------
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import assert from "assert";
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import path from "path";
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import ignore from "ignore";
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import debugOrig from "debug";
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const debug = debugOrig("eslintrc:ignore-pattern");
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/** @typedef {ReturnType<import("ignore").default>} Ignore */
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//------------------------------------------------------------------------------
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// Helpers
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//------------------------------------------------------------------------------
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/**
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* Get the path to the common ancestor directory of given paths.
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* @param {string[]} sourcePaths The paths to calculate the common ancestor.
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* @returns {string} The path to the common ancestor directory.
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*/
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function getCommonAncestorPath(sourcePaths) {
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let result = sourcePaths[0];
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for (let i = 1; i < sourcePaths.length; ++i) {
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const a = result;
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const b = sourcePaths[i];
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// Set the shorter one (it's the common ancestor if one includes the other).
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result = a.length < b.length ? a : b;
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// Set the common ancestor.
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for (let j = 0, lastSepPos = 0; j < a.length && j < b.length; ++j) {
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if (a[j] !== b[j]) {
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result = a.slice(0, lastSepPos);
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break;
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}
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if (a[j] === path.sep) {
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lastSepPos = j;
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}
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}
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}
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let resolvedResult = result || path.sep;
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// if Windows common ancestor is root of drive must have trailing slash to be absolute.
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if (resolvedResult && resolvedResult.endsWith(":") && process.platform === "win32") {
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resolvedResult += path.sep;
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}
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return resolvedResult;
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}
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/**
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* Make relative path.
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* @param {string} from The source path to get relative path.
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* @param {string} to The destination path to get relative path.
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* @returns {string} The relative path.
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*/
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function relative(from, to) {
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const relPath = path.relative(from, to);
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if (path.sep === "/") {
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return relPath;
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}
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return relPath.split(path.sep).join("/");
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}
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/**
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* Get the trailing slash if existed.
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* @param {string} filePath The path to check.
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* @returns {string} The trailing slash if existed.
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*/
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function dirSuffix(filePath) {
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const isDir = (
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filePath.endsWith(path.sep) ||
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(process.platform === "win32" && filePath.endsWith("/"))
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);
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return isDir ? "/" : "";
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}
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const DefaultPatterns = Object.freeze(["/**/node_modules/*"]);
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const DotPatterns = Object.freeze([".*", "!.eslintrc.*", "!../"]);
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//------------------------------------------------------------------------------
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// Public
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//------------------------------------------------------------------------------
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class IgnorePattern {
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/**
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* The default patterns.
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* @type {string[]}
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*/
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static get DefaultPatterns() {
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return DefaultPatterns;
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}
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/**
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* Create the default predicate function.
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* @param {string} cwd The current working directory.
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* @returns {((filePath:string, dot:boolean) => boolean) & {basePath:string; patterns:string[]}}
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* The preficate function.
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* The first argument is an absolute path that is checked.
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* The second argument is the flag to not ignore dotfiles.
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* If the predicate function returned `true`, it means the path should be ignored.
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*/
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static createDefaultIgnore(cwd) {
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return this.createIgnore([new IgnorePattern(DefaultPatterns, cwd)]);
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}
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/**
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* Create the predicate function from multiple `IgnorePattern` objects.
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* @param {IgnorePattern[]} ignorePatterns The list of ignore patterns.
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* @returns {((filePath:string, dot?:boolean) => boolean) & {basePath:string; patterns:string[]}}
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* The preficate function.
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* The first argument is an absolute path that is checked.
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* The second argument is the flag to not ignore dotfiles.
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* If the predicate function returned `true`, it means the path should be ignored.
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*/
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static createIgnore(ignorePatterns) {
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debug("Create with: %o", ignorePatterns);
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const basePath = getCommonAncestorPath(ignorePatterns.map(p => p.basePath));
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const patterns = [].concat(
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...ignorePatterns.map(p => p.getPatternsRelativeTo(basePath))
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);
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const ig = ignore({ allowRelativePaths: true }).add([...DotPatterns, ...patterns]);
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const dotIg = ignore({ allowRelativePaths: true }).add(patterns);
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debug(" processed: %o", { basePath, patterns });
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return Object.assign(
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(filePath, dot = false) => {
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assert(path.isAbsolute(filePath), "'filePath' should be an absolute path.");
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const relPathRaw = relative(basePath, filePath);
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const relPath = relPathRaw && (relPathRaw + dirSuffix(filePath));
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const adoptedIg = dot ? dotIg : ig;
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const result = relPath !== "" && adoptedIg.ignores(relPath);
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debug("Check", { filePath, dot, relativePath: relPath, result });
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return result;
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},
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{ basePath, patterns }
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);
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}
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/**
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* Initialize a new `IgnorePattern` instance.
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* @param {string[]} patterns The glob patterns that ignore to lint.
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* @param {string} basePath The base path of `patterns`.
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*/
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constructor(patterns, basePath) {
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assert(path.isAbsolute(basePath), "'basePath' should be an absolute path.");
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/**
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* The glob patterns that ignore to lint.
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* @type {string[]}
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*/
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this.patterns = patterns;
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/**
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* The base path of `patterns`.
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* @type {string}
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*/
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this.basePath = basePath;
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/**
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* If `true` then patterns which don't start with `/` will match the paths to the outside of `basePath`. Defaults to `false`.
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*
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* It's set `true` for `.eslintignore`, `package.json`, and `--ignore-path` for backward compatibility.
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* It's `false` as-is for `ignorePatterns` property in config files.
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* @type {boolean}
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*/
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this.loose = false;
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}
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/**
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* Get `patterns` as modified for a given base path. It modifies the
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* absolute paths in the patterns as prepending the difference of two base
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* paths.
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* @param {string} newBasePath The base path.
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* @returns {string[]} Modifired patterns.
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*/
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getPatternsRelativeTo(newBasePath) {
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assert(path.isAbsolute(newBasePath), "'newBasePath' should be an absolute path.");
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const { basePath, loose, patterns } = this;
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if (newBasePath === basePath) {
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return patterns;
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}
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const prefix = `/${relative(newBasePath, basePath)}`;
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return patterns.map(pattern => {
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const negative = pattern.startsWith("!");
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const head = negative ? "!" : "";
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const body = negative ? pattern.slice(1) : pattern;
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if (body.startsWith("/") || body.startsWith("../")) {
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return `${head}${prefix}${body}`;
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}
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return loose ? pattern : `${head}${prefix}/**/${body}`;
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});
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}
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}
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export { IgnorePattern };
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