line-comment-position.js
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/**
* @fileoverview Rule to enforce the position of line comments
* @author Alberto Rodríguez
*/
"use strict";
const astUtils = require("./utils/ast-utils");
//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------
module.exports = {
meta: {
type: "layout",
docs: {
description: "enforce position of line comments",
category: "Stylistic Issues",
recommended: false,
url: "https://eslint.org/docs/rules/line-comment-position"
},
schema: [
{
oneOf: [
{
enum: ["above", "beside"]
},
{
type: "object",
properties: {
position: {
enum: ["above", "beside"]
},
ignorePattern: {
type: "string"
},
applyDefaultPatterns: {
type: "boolean"
},
applyDefaultIgnorePatterns: {
type: "boolean"
}
},
additionalProperties: false
}
]
}
],
messages: {
above: "Expected comment to be above code.",
beside: "Expected comment to be beside code."
}
},
create(context) {
const options = context.options[0];
let above,
ignorePattern,
applyDefaultIgnorePatterns = true;
if (!options || typeof options === "string") {
above = !options || options === "above";
} else {
above = !options.position || options.position === "above";
ignorePattern = options.ignorePattern;
if (Object.prototype.hasOwnProperty.call(options, "applyDefaultIgnorePatterns")) {
applyDefaultIgnorePatterns = options.applyDefaultIgnorePatterns;
} else {
applyDefaultIgnorePatterns = options.applyDefaultPatterns !== false;
}
}
const defaultIgnoreRegExp = astUtils.COMMENTS_IGNORE_PATTERN;
const fallThroughRegExp = /^\s*falls?\s?through/u;
const customIgnoreRegExp = new RegExp(ignorePattern, "u");
const sourceCode = context.getSourceCode();
//--------------------------------------------------------------------------
// Public
//--------------------------------------------------------------------------
return {
Program() {
const comments = sourceCode.getAllComments();
comments.filter(token => token.type === "Line").forEach(node => {
if (applyDefaultIgnorePatterns && (defaultIgnoreRegExp.test(node.value) || fallThroughRegExp.test(node.value))) {
return;
}
if (ignorePattern && customIgnoreRegExp.test(node.value)) {
return;
}
const previous = sourceCode.getTokenBefore(node, { includeComments: true });
const isOnSameLine = previous && previous.loc.end.line === node.loc.start.line;
if (above) {
if (isOnSameLine) {
context.report({
node,
messageId: "above"
});
}
} else {
if (!isOnSameLine) {
context.report({
node,
messageId: "beside"
});
}
}
});
}
};
}
};