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
* @copyright 2014 Greg Cochard. All rights reserved.
*/
"use strict";
//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------
module.exports = function(context) {
// Use options.max or 2 as default
var max = 2,
maxEOF;
// store lines that appear empty but really aren't
var notEmpty = [];
if (context.options.length) {
max = context.options[0].max;
maxEOF = context.options[0].maxEOF;
}
//--------------------------------------------------------------------------
// Public
//--------------------------------------------------------------------------
return {
"TemplateLiteral": function(node) {
var start = node.loc.start.line;
var end = node.loc.end.line;
while (start <= end) {
notEmpty.push(start);
start++;
}
},
"Program:exit": function checkBlankLines(node) {
var lines = context.getSourceLines(),
currentLocation = -1,
lastLocation,
blankCounter = 0,
location,
trimmedLines = lines.map(function(str) {
return str.trim();
}),
firstOfEndingBlankLines;
// add the notEmpty lines in there with a placeholder
notEmpty.forEach(function(x, i) {
trimmedLines[i] = x;
});
if (typeof maxEOF === "undefined") {
// swallow the final newline, as some editors add it
// automatically and we don't want it to cause an issue
if (trimmedLines[trimmedLines.length - 1] === "") {
trimmedLines = trimmedLines.slice(0, -1);
}
firstOfEndingBlankLines = trimmedLines.length;
} else {
// save the number of the first of the last blank lines
firstOfEndingBlankLines = trimmedLines.length;
while (trimmedLines[firstOfEndingBlankLines - 1] === ""
&& firstOfEndingBlankLines > 0) {
firstOfEndingBlankLines--;
}
}
// Aggregate and count blank lines
lastLocation = currentLocation;
currentLocation = trimmedLines.indexOf("", currentLocation + 1);
while (currentLocation !== -1) {
lastLocation = currentLocation;
currentLocation = trimmedLines.indexOf("", currentLocation + 1);
if (lastLocation === currentLocation - 1) {
blankCounter++;
} else {
location = {
line: lastLocation + 1,
column: 1
};
if (lastLocation < firstOfEndingBlankLines) {
// within the file, not at the end
if (blankCounter >= max) {
context.report(node, location,
"More than " + max + " blank " + (max === 1 ? "line" : "lines") + " not allowed.");
}
} else {
// inside the last blank lines
if (blankCounter >= maxEOF) {
context.report(node, location,
"Too many blank lines at the end of file. Max of " + maxEOF + " allowed.");
}
}
// Finally, reset the blank counter
blankCounter = 0;
}
}
}
};
};
module.exports.schema = [
{
"type": "object",
"properties": {
"max": {
"type": "integer"
},
"maxEOF": {
"type": "integer"
}
},
"required": ["max"],
"additionalProperties": false
}
];