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qwen/nodejs/node_modules/eslint/lib/rules/linebreak-style.js

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+/**
+ * @fileoverview Rule to enforce a single linebreak style.
+ * @author Erik Mueller
+ * @deprecated in ESLint v8.53.0
+ */
+
+"use strict";
+
+//------------------------------------------------------------------------------
+// Requirements
+//------------------------------------------------------------------------------
+
+const astUtils = require("./utils/ast-utils");
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+/** @type {import('../shared/types').Rule} */
+module.exports = {
+    meta: {
+        deprecated: true,
+        replacedBy: [],
+        type: "layout",
+
+        docs: {
+            description: "Enforce consistent linebreak style",
+            recommended: false,
+            url: "https://eslint.org/docs/latest/rules/linebreak-style"
+        },
+
+        fixable: "whitespace",
+
+        schema: [
+            {
+                enum: ["unix", "windows"]
+            }
+        ],
+        messages: {
+            expectedLF: "Expected linebreaks to be 'LF' but found 'CRLF'.",
+            expectedCRLF: "Expected linebreaks to be 'CRLF' but found 'LF'."
+        }
+    },
+
+    create(context) {
+        const sourceCode = context.sourceCode;
+
+        //--------------------------------------------------------------------------
+        // Helpers
+        //--------------------------------------------------------------------------
+
+        /**
+         * Builds a fix function that replaces text at the specified range in the source text.
+         * @param {int[]} range The range to replace
+         * @param {string} text The text to insert.
+         * @returns {Function} Fixer function
+         * @private
+         */
+        function createFix(range, text) {
+            return function(fixer) {
+                return fixer.replaceTextRange(range, text);
+            };
+        }
+
+        //--------------------------------------------------------------------------
+        // Public
+        //--------------------------------------------------------------------------
+
+        return {
+            Program: function checkForLinebreakStyle(node) {
+                const linebreakStyle = context.options[0] || "unix",
+                    expectedLF = linebreakStyle === "unix",
+                    expectedLFChars = expectedLF ? "\n" : "\r\n",
+                    source = sourceCode.getText(),
+                    pattern = astUtils.createGlobalLinebreakMatcher();
+                let match;
+
+                let i = 0;
+
+                while ((match = pattern.exec(source)) !== null) {
+                    i++;
+                    if (match[0] === expectedLFChars) {
+                        continue;
+                    }
+
+                    const index = match.index;
+                    const range = [index, index + match[0].length];
+
+                    context.report({
+                        node,
+                        loc: {
+                            start: {
+                                line: i,
+                                column: sourceCode.lines[i - 1].length
+                            },
+                            end: {
+                                line: i + 1,
+                                column: 0
+                            }
+                        },
+                        messageId: expectedLF ? "expectedLF" : "expectedCRLF",
+                        fix: createFix(range, expectedLFChars)
+                    });
+                }
+            }
+        };
+    }
+};