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node_modules/eslint/lib/rules/max-lines.js

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+/**
+ * @fileoverview enforce a maximum file length
+ * @author Alberto Rodríguez
+ */
+"use strict";
+
+//------------------------------------------------------------------------------
+// Requirements
+//------------------------------------------------------------------------------
+
+const lodash = require("lodash");
+const astUtils = require("./utils/ast-utils");
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+module.exports = {
+    meta: {
+        type: "suggestion",
+
+        docs: {
+            description: "enforce a maximum number of lines per file",
+            category: "Stylistic Issues",
+            recommended: false,
+            url: "https://eslint.org/docs/rules/max-lines"
+        },
+
+        schema: [
+            {
+                oneOf: [
+                    {
+                        type: "integer",
+                        minimum: 0
+                    },
+                    {
+                        type: "object",
+                        properties: {
+                            max: {
+                                type: "integer",
+                                minimum: 0
+                            },
+                            skipComments: {
+                                type: "boolean"
+                            },
+                            skipBlankLines: {
+                                type: "boolean"
+                            }
+                        },
+                        additionalProperties: false
+                    }
+                ]
+            }
+        ],
+        messages: {
+            exceed: "File has too many lines ({{actual}}). Maximum allowed is {{max}}."
+        }
+    },
+
+    create(context) {
+        const option = context.options[0];
+        let max = 300;
+
+        if (typeof option === "object" && Object.prototype.hasOwnProperty.call(option, "max")) {
+            max = option.max;
+        } else if (typeof option === "number") {
+            max = option;
+        }
+
+        const skipComments = option && option.skipComments;
+        const skipBlankLines = option && option.skipBlankLines;
+
+        const sourceCode = context.getSourceCode();
+
+        /**
+         * Returns whether or not a token is a comment node type
+         * @param {Token} token The token to check
+         * @returns {boolean} True if the token is a comment node
+         */
+        function isCommentNodeType(token) {
+            return token && (token.type === "Block" || token.type === "Line");
+        }
+
+        /**
+         * Returns the line numbers of a comment that don't have any code on the same line
+         * @param {Node} comment The comment node to check
+         * @returns {number[]} The line numbers
+         */
+        function getLinesWithoutCode(comment) {
+            let start = comment.loc.start.line;
+            let end = comment.loc.end.line;
+
+            let token;
+
+            token = comment;
+            do {
+                token = sourceCode.getTokenBefore(token, { includeComments: true });
+            } while (isCommentNodeType(token));
+
+            if (token && astUtils.isTokenOnSameLine(token, comment)) {
+                start += 1;
+            }
+
+            token = comment;
+            do {
+                token = sourceCode.getTokenAfter(token, { includeComments: true });
+            } while (isCommentNodeType(token));
+
+            if (token && astUtils.isTokenOnSameLine(comment, token)) {
+                end -= 1;
+            }
+
+            if (start <= end) {
+                return lodash.range(start, end + 1);
+            }
+            return [];
+        }
+
+        return {
+            "Program:exit"() {
+                let lines = sourceCode.lines.map((text, i) => ({ lineNumber: i + 1, text }));
+
+                if (skipBlankLines) {
+                    lines = lines.filter(l => l.text.trim() !== "");
+                }
+
+                if (skipComments) {
+                    const comments = sourceCode.getAllComments();
+
+                    const commentLines = lodash.flatten(comments.map(comment => getLinesWithoutCode(comment)));
+
+                    lines = lines.filter(l => !lodash.includes(commentLines, l.lineNumber));
+                }
+
+                if (lines.length > max) {
+                    context.report({
+                        loc: { line: 1, column: 0 },
+                        messageId: "exceed",
+                        data: {
+                            max,
+                            actual: lines.length
+                        }
+                    });
+                }
+            }
+        };
+    }
+};