282 lines
10 KiB
JavaScript
282 lines
10 KiB
JavaScript
/**
|
|
* @fileoverview A rule to ensure blank lines within blocks.
|
|
* @author Mathias Schreck <https://github.com/lo1tuma>
|
|
*/
|
|
|
|
"use strict";
|
|
|
|
//------------------------------------------------------------------------------
|
|
// Requirements
|
|
//------------------------------------------------------------------------------
|
|
|
|
const astUtils = require("../util/ast-utils");
|
|
|
|
//------------------------------------------------------------------------------
|
|
// Rule Definition
|
|
//------------------------------------------------------------------------------
|
|
|
|
module.exports = {
|
|
meta: {
|
|
type: "layout",
|
|
|
|
docs: {
|
|
description: "require or disallow padding within blocks",
|
|
category: "Stylistic Issues",
|
|
recommended: false,
|
|
url: "https://eslint.org/docs/rules/padded-blocks"
|
|
},
|
|
|
|
fixable: "whitespace",
|
|
|
|
schema: [
|
|
{
|
|
oneOf: [
|
|
{
|
|
enum: ["always", "never"]
|
|
},
|
|
{
|
|
type: "object",
|
|
properties: {
|
|
blocks: {
|
|
enum: ["always", "never"]
|
|
},
|
|
switches: {
|
|
enum: ["always", "never"]
|
|
},
|
|
classes: {
|
|
enum: ["always", "never"]
|
|
}
|
|
},
|
|
additionalProperties: false,
|
|
minProperties: 1
|
|
}
|
|
]
|
|
},
|
|
{
|
|
type: "object",
|
|
properties: {
|
|
allowSingleLineBlocks: {
|
|
type: "boolean"
|
|
}
|
|
}
|
|
}
|
|
]
|
|
},
|
|
|
|
create(context) {
|
|
const options = {};
|
|
const typeOptions = context.options[0] || "always";
|
|
const exceptOptions = context.options[1] || {};
|
|
|
|
if (typeof typeOptions === "string") {
|
|
const shouldHavePadding = typeOptions === "always";
|
|
|
|
options.blocks = shouldHavePadding;
|
|
options.switches = shouldHavePadding;
|
|
options.classes = shouldHavePadding;
|
|
} else {
|
|
if (Object.prototype.hasOwnProperty.call(typeOptions, "blocks")) {
|
|
options.blocks = typeOptions.blocks === "always";
|
|
}
|
|
if (Object.prototype.hasOwnProperty.call(typeOptions, "switches")) {
|
|
options.switches = typeOptions.switches === "always";
|
|
}
|
|
if (Object.prototype.hasOwnProperty.call(typeOptions, "classes")) {
|
|
options.classes = typeOptions.classes === "always";
|
|
}
|
|
}
|
|
|
|
if (Object.prototype.hasOwnProperty.call(exceptOptions, "allowSingleLineBlocks")) {
|
|
options.allowSingleLineBlocks = exceptOptions.allowSingleLineBlocks === true;
|
|
}
|
|
|
|
const ALWAYS_MESSAGE = "Block must be padded by blank lines.",
|
|
NEVER_MESSAGE = "Block must not be padded by blank lines.";
|
|
|
|
const sourceCode = context.getSourceCode();
|
|
|
|
/**
|
|
* Gets the open brace token from a given node.
|
|
* @param {ASTNode} node - A BlockStatement or SwitchStatement node from which to get the open brace.
|
|
* @returns {Token} The token of the open brace.
|
|
*/
|
|
function getOpenBrace(node) {
|
|
if (node.type === "SwitchStatement") {
|
|
return sourceCode.getTokenBefore(node.cases[0]);
|
|
}
|
|
return sourceCode.getFirstToken(node);
|
|
}
|
|
|
|
/**
|
|
* Checks if the given parameter is a comment node
|
|
* @param {ASTNode|Token} node An AST node or token
|
|
* @returns {boolean} True if node is a comment
|
|
*/
|
|
function isComment(node) {
|
|
return node.type === "Line" || node.type === "Block";
|
|
}
|
|
|
|
/**
|
|
* Checks if there is padding between two tokens
|
|
* @param {Token} first The first token
|
|
* @param {Token} second The second token
|
|
* @returns {boolean} True if there is at least a line between the tokens
|
|
*/
|
|
function isPaddingBetweenTokens(first, second) {
|
|
return second.loc.start.line - first.loc.end.line >= 2;
|
|
}
|
|
|
|
|
|
/**
|
|
* Checks if the given token has a blank line after it.
|
|
* @param {Token} token The token to check.
|
|
* @returns {boolean} Whether or not the token is followed by a blank line.
|
|
*/
|
|
function getFirstBlockToken(token) {
|
|
let prev,
|
|
first = token;
|
|
|
|
do {
|
|
prev = first;
|
|
first = sourceCode.getTokenAfter(first, { includeComments: true });
|
|
} while (isComment(first) && first.loc.start.line === prev.loc.end.line);
|
|
|
|
return first;
|
|
}
|
|
|
|
/**
|
|
* Checks if the given token is preceeded by a blank line.
|
|
* @param {Token} token The token to check
|
|
* @returns {boolean} Whether or not the token is preceeded by a blank line
|
|
*/
|
|
function getLastBlockToken(token) {
|
|
let last = token,
|
|
next;
|
|
|
|
do {
|
|
next = last;
|
|
last = sourceCode.getTokenBefore(last, { includeComments: true });
|
|
} while (isComment(last) && last.loc.end.line === next.loc.start.line);
|
|
|
|
return last;
|
|
}
|
|
|
|
/**
|
|
* Checks if a node should be padded, according to the rule config.
|
|
* @param {ASTNode} node The AST node to check.
|
|
* @returns {boolean} True if the node should be padded, false otherwise.
|
|
*/
|
|
function requirePaddingFor(node) {
|
|
switch (node.type) {
|
|
case "BlockStatement":
|
|
return options.blocks;
|
|
case "SwitchStatement":
|
|
return options.switches;
|
|
case "ClassBody":
|
|
return options.classes;
|
|
|
|
/* istanbul ignore next */
|
|
default:
|
|
throw new Error("unreachable");
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Checks the given BlockStatement node to be padded if the block is not empty.
|
|
* @param {ASTNode} node The AST node of a BlockStatement.
|
|
* @returns {void} undefined.
|
|
*/
|
|
function checkPadding(node) {
|
|
const openBrace = getOpenBrace(node),
|
|
firstBlockToken = getFirstBlockToken(openBrace),
|
|
tokenBeforeFirst = sourceCode.getTokenBefore(firstBlockToken, { includeComments: true }),
|
|
closeBrace = sourceCode.getLastToken(node),
|
|
lastBlockToken = getLastBlockToken(closeBrace),
|
|
tokenAfterLast = sourceCode.getTokenAfter(lastBlockToken, { includeComments: true }),
|
|
blockHasTopPadding = isPaddingBetweenTokens(tokenBeforeFirst, firstBlockToken),
|
|
blockHasBottomPadding = isPaddingBetweenTokens(lastBlockToken, tokenAfterLast);
|
|
|
|
if (options.allowSingleLineBlocks && astUtils.isTokenOnSameLine(tokenBeforeFirst, tokenAfterLast)) {
|
|
return;
|
|
}
|
|
|
|
if (requirePaddingFor(node)) {
|
|
if (!blockHasTopPadding) {
|
|
context.report({
|
|
node,
|
|
loc: { line: tokenBeforeFirst.loc.start.line, column: tokenBeforeFirst.loc.start.column },
|
|
fix(fixer) {
|
|
return fixer.insertTextAfter(tokenBeforeFirst, "\n");
|
|
},
|
|
message: ALWAYS_MESSAGE
|
|
});
|
|
}
|
|
if (!blockHasBottomPadding) {
|
|
context.report({
|
|
node,
|
|
loc: { line: tokenAfterLast.loc.end.line, column: tokenAfterLast.loc.end.column - 1 },
|
|
fix(fixer) {
|
|
return fixer.insertTextBefore(tokenAfterLast, "\n");
|
|
},
|
|
message: ALWAYS_MESSAGE
|
|
});
|
|
}
|
|
} else {
|
|
if (blockHasTopPadding) {
|
|
|
|
context.report({
|
|
node,
|
|
loc: { line: tokenBeforeFirst.loc.start.line, column: tokenBeforeFirst.loc.start.column },
|
|
fix(fixer) {
|
|
return fixer.replaceTextRange([tokenBeforeFirst.range[1], firstBlockToken.range[0] - firstBlockToken.loc.start.column], "\n");
|
|
},
|
|
message: NEVER_MESSAGE
|
|
});
|
|
}
|
|
|
|
if (blockHasBottomPadding) {
|
|
|
|
context.report({
|
|
node,
|
|
loc: { line: tokenAfterLast.loc.end.line, column: tokenAfterLast.loc.end.column - 1 },
|
|
message: NEVER_MESSAGE,
|
|
fix(fixer) {
|
|
return fixer.replaceTextRange([lastBlockToken.range[1], tokenAfterLast.range[0] - tokenAfterLast.loc.start.column], "\n");
|
|
}
|
|
});
|
|
}
|
|
}
|
|
}
|
|
|
|
const rule = {};
|
|
|
|
if (Object.prototype.hasOwnProperty.call(options, "switches")) {
|
|
rule.SwitchStatement = function(node) {
|
|
if (node.cases.length === 0) {
|
|
return;
|
|
}
|
|
checkPadding(node);
|
|
};
|
|
}
|
|
|
|
if (Object.prototype.hasOwnProperty.call(options, "blocks")) {
|
|
rule.BlockStatement = function(node) {
|
|
if (node.body.length === 0) {
|
|
return;
|
|
}
|
|
checkPadding(node);
|
|
};
|
|
}
|
|
|
|
if (Object.prototype.hasOwnProperty.call(options, "classes")) {
|
|
rule.ClassBody = function(node) {
|
|
if (node.body.length === 0) {
|
|
return;
|
|
}
|
|
checkPadding(node);
|
|
};
|
|
}
|
|
|
|
return rule;
|
|
}
|
|
};
|