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[dotfiles/.git] / .config / coc / extensions / node_modules / coc-prettier / node_modules / eslint / lib / cli-engine / lint-result-cache.js

diff --git a/.config/coc/extensions/node_modules/coc-prettier/node_modules/eslint/lib/cli-engine/lint-result-cache.js b/.config/coc/extensions/node_modules/coc-prettier/node_modules/eslint/lib/cli-engine/lint-result-cache.js
new file mode 100644 (file)
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+++ b/.config/coc/extensions/node_modules/coc-prettier/node_modules/eslint/lib/cli-engine/lint-result-cache.js
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+/**
+ * @fileoverview Utility for caching lint results.
+ * @author Kevin Partington
+ */
+"use strict";
+
+//-----------------------------------------------------------------------------
+// Requirements
+//-----------------------------------------------------------------------------
+
+const assert = require("assert");
+const fs = require("fs");
+const fileEntryCache = require("file-entry-cache");
+const stringify = require("json-stable-stringify-without-jsonify");
+const pkg = require("../../package.json");
+const hash = require("./hash");
+
+//-----------------------------------------------------------------------------
+// Helpers
+//-----------------------------------------------------------------------------
+
+const configHashCache = new WeakMap();
+const nodeVersion = process && process.version;
+
+/**
+ * Calculates the hash of the config
+ * @param {ConfigArray} config The config.
+ * @returns {string} The hash of the config
+ */
+function hashOfConfigFor(config) {
+    if (!configHashCache.has(config)) {
+        configHashCache.set(config, hash(`${pkg.version}_${nodeVersion}_${stringify(config)}`));
+    }
+
+    return configHashCache.get(config);
+}
+
+//-----------------------------------------------------------------------------
+// Public Interface
+//-----------------------------------------------------------------------------
+
+/**
+ * Lint result cache. This wraps around the file-entry-cache module,
+ * transparently removing properties that are difficult or expensive to
+ * serialize and adding them back in on retrieval.
+ */
+class LintResultCache {
+
+    /**
+     * Creates a new LintResultCache instance.
+     * @param {string} cacheFileLocation The cache file location.
+     *   configuration lookup by file path).
+     */
+    constructor(cacheFileLocation) {
+        assert(cacheFileLocation, "Cache file location is required");
+
+        this.fileEntryCache = fileEntryCache.create(cacheFileLocation);
+    }
+
+    /**
+     * Retrieve cached lint results for a given file path, if present in the
+     * cache. If the file is present and has not been changed, rebuild any
+     * missing result information.
+     * @param {string} filePath The file for which to retrieve lint results.
+     * @param {ConfigArray} config The config of the file.
+     * @returns {Object|null} The rebuilt lint results, or null if the file is
+     *   changed or not in the filesystem.
+     */
+    getCachedLintResults(filePath, config) {
+
+        /*
+         * Cached lint results are valid if and only if:
+         * 1. The file is present in the filesystem
+         * 2. The file has not changed since the time it was previously linted
+         * 3. The ESLint configuration has not changed since the time the file
+         *    was previously linted
+         * If any of these are not true, we will not reuse the lint results.
+         */
+
+        const fileDescriptor = this.fileEntryCache.getFileDescriptor(filePath);
+        const hashOfConfig = hashOfConfigFor(config);
+        const changed = fileDescriptor.changed || fileDescriptor.meta.hashOfConfig !== hashOfConfig;
+
+        if (fileDescriptor.notFound || changed) {
+            return null;
+        }
+
+        // If source is present but null, need to reread the file from the filesystem.
+        if (fileDescriptor.meta.results && fileDescriptor.meta.results.source === null) {
+            fileDescriptor.meta.results.source = fs.readFileSync(filePath, "utf-8");
+        }
+
+        return fileDescriptor.meta.results;
+    }
+
+    /**
+     * Set the cached lint results for a given file path, after removing any
+     * information that will be both unnecessary and difficult to serialize.
+     * Avoids caching results with an "output" property (meaning fixes were
+     * applied), to prevent potentially incorrect results if fixes are not
+     * written to disk.
+     * @param {string} filePath The file for which to set lint results.
+     * @param {ConfigArray} config The config of the file.
+     * @param {Object} result The lint result to be set for the file.
+     * @returns {void}
+     */
+    setCachedLintResults(filePath, config, result) {
+        if (result && Object.prototype.hasOwnProperty.call(result, "output")) {
+            return;
+        }
+
+        const fileDescriptor = this.fileEntryCache.getFileDescriptor(filePath);
+
+        if (fileDescriptor && !fileDescriptor.notFound) {
+
+            // Serialize the result, except that we want to remove the file source if present.
+            const resultToSerialize = Object.assign({}, result);
+
+            /*
+             * Set result.source to null.
+             * In `getCachedLintResults`, if source is explicitly null, we will
+             * read the file from the filesystem to set the value again.
+             */
+            if (Object.prototype.hasOwnProperty.call(resultToSerialize, "source")) {
+                resultToSerialize.source = null;
+            }
+
+            fileDescriptor.meta.results = resultToSerialize;
+            fileDescriptor.meta.hashOfConfig = hashOfConfigFor(config);
+        }
+    }
+
+    /**
+     * Persists the in-memory cache to disk.
+     * @returns {void}
+     */
+    reconcile() {
+        this.fileEntryCache.reconcile();
+    }
+}
+
+module.exports = LintResultCache;