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app_vue/node_modules/eslint/lib/rules/no-multiple-empty-lines.js

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+/**
+ * @fileoverview Disallows multiple blank lines.
+ * implementation adapted from the no-trailing-spaces rule.
+ * @author Greg Cochard
+ */
+"use strict";
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+module.exports = {
+    meta: {
+        type: "layout",
+
+        docs: {
+            description: "disallow multiple empty lines",
+            category: "Stylistic Issues",
+            recommended: false,
+            url: "https://eslint.org/docs/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.getSourceCode();
+
+        // 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);
+            }
+        };
+    }
+};