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/** * @fileoverview Disallows multiple blank lines. * implementation adapted from the no-trailing-spaces rule. * @author Greg Cochard * @deprecated in ESLint v8.53.0 */ "use strict"; //------------------------------------------------------------------------------ // Rule Definition //------------------------------------------------------------------------------ /** @type {import('../shared/types').Rule} */ module.exports = { meta: { deprecated: true, replacedBy: [], type: "layout", docs: { description: "Disallow multiple empty lines", recommended: false, url: "https://eslint.org/docs/latest/rules/no-multiple-empty-lines" }, fixable: "whitespace", schema: [ { type: "object", properties: { max: { type: "integer", minimum: 0 }, maxEOF: { type: "integer", minimum: 0 }, maxBOF: { type: "integer", minimum: 0 } }, required: ["max"], additionalProperties: false } ], messages: { blankBeginningOfFile: "Too many blank lines at the beginning of file. Max of {{max}} allowed.", blankEndOfFile: "Too many blank lines at the end of file. Max of {{max}} allowed.", consecutiveBlank: "More than {{max}} blank {{pluralizedLines}} not allowed." } }, create(context) { // Use options.max or 2 as default let max = 2, maxEOF = max, maxBOF = max; if (context.options.length) { max = context.options[0].max; maxEOF = typeof context.options[0].maxEOF !== "undefined" ? context.options[0].maxEOF : max; maxBOF = typeof context.options[0].maxBOF !== "undefined" ? context.options[0].maxBOF : max; } const sourceCode = context.sourceCode; // Swallow the final newline, as some editors add it automatically and we don't want it to cause an issue const allLines = sourceCode.lines[sourceCode.lines.length - 1] === "" ? sourceCode.lines.slice(0, -1) : sourceCode.lines; const templateLiteralLines = new Set(); //-------------------------------------------------------------------------- // Public //-------------------------------------------------------------------------- return { TemplateLiteral(node) { node.quasis.forEach(literalPart => { // Empty lines have a semantic meaning if they're inside template literals. Don't count these as empty lines. for (let ignoredLine = literalPart.loc.start.line; ignoredLine < literalPart.loc.end.line; ignoredLine++) { templateLiteralLines.add(ignoredLine); } }); }, "Program:exit"(node) { return allLines // Given a list of lines, first get a list of line numbers that are non-empty. .reduce((nonEmptyLineNumbers, line, index) => { if (line.trim() || templateLiteralLines.has(index + 1)) { nonEmptyLineNumbers.push(index + 1); } return nonEmptyLineNumbers; }, []) // Add a value at the end to allow trailing empty lines to be checked. .concat(allLines.length + 1) // Given two line numbers of non-empty lines, report the lines between if the difference is too large. .reduce((lastLineNumber, lineNumber) => { let messageId, maxAllowed; if (lastLineNumber === 0) { messageId = "blankBeginningOfFile"; maxAllowed = maxBOF; } else if (lineNumber === allLines.length + 1) { messageId = "blankEndOfFile"; maxAllowed = maxEOF; } else { messageId = "consecutiveBlank"; maxAllowed = max; } if (lineNumber - lastLineNumber - 1 > maxAllowed) { context.report({ node, loc: { start: { line: lastLineNumber + maxAllowed + 1, column: 0 }, end: { line: lineNumber, column: 0 } }, messageId, data: { max: maxAllowed, pluralizedLines: maxAllowed === 1 ? "line" : "lines" }, fix(fixer) { const rangeStart = sourceCode.getIndexFromLoc({ line: lastLineNumber + 1, column: 0 }); /* * The end of the removal range is usually the start index of the next line. * However, at the end of the file there is no next line, so the end of the * range is just the length of the text. */ const lineNumberAfterRemovedLines = lineNumber - maxAllowed; const rangeEnd = lineNumberAfterRemovedLines <= allLines.length ? sourceCode.getIndexFromLoc({ line: lineNumberAfterRemovedLines, column: 0 }) : sourceCode.text.length; return fixer.removeRange([rangeStart, rangeEnd]); } }); } return lineNumber; }, 0); } }; } };