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Mini Shell
Mini Shell
/**
* @fileoverview A rule to ensure blank lines within blocks.
* @author Mathias Schreck <https://github.com/lo1tuma>
*/
"use strict";
//------------------------------------------------------------------------------
// Requirements
//------------------------------------------------------------------------------
const astUtils = require("./utils/ast-utils");
//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------
/** @type {import('../shared/types').Rule} */
module.exports = {
meta: {
type: "layout",
docs: {
description: "require or disallow padding within blocks",
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"
}
},
additionalProperties: false
}
],
messages: {
alwaysPadBlock: "Block must be padded by blank lines.",
neverPadBlock: "Block must not be padded by blank lines."
}
},
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 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]);
}
if (node.type === "StaticBlock") {
return sourceCode.getFirstToken(node, { skip: 1 }); // skip the `static` token
}
// `BlockStatement` or `ClassBody`
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 preceded by a blank line.
* @param {Token} token The token to check
* @returns {boolean} Whether or not the token is preceded 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.
* @throws {Error} (Unreachable)
* @returns {boolean} True if the node should be padded, false otherwise.
*/
function requirePaddingFor(node) {
switch (node.type) {
case "BlockStatement":
case "StaticBlock":
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: {
start: tokenBeforeFirst.loc.start,
end: firstBlockToken.loc.start
},
fix(fixer) {
return fixer.insertTextAfter(tokenBeforeFirst, "\n");
},
messageId: "alwaysPadBlock"
});
}
if (!blockHasBottomPadding) {
context.report({
node,
loc: {
end: tokenAfterLast.loc.start,
start: lastBlockToken.loc.end
},
fix(fixer) {
return fixer.insertTextBefore(tokenAfterLast, "\n");
},
messageId: "alwaysPadBlock"
});
}
} else {
if (blockHasTopPadding) {
context.report({
node,
loc: {
start: tokenBeforeFirst.loc.start,
end: firstBlockToken.loc.start
},
fix(fixer) {
return fixer.replaceTextRange([tokenBeforeFirst.range[1], firstBlockToken.range[0] - firstBlockToken.loc.start.column], "\n");
},
messageId: "neverPadBlock"
});
}
if (blockHasBottomPadding) {
context.report({
node,
loc: {
end: tokenAfterLast.loc.start,
start: lastBlockToken.loc.end
},
messageId: "neverPadBlock",
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);
};
rule.StaticBlock = rule.BlockStatement;
}
if (Object.prototype.hasOwnProperty.call(options, "classes")) {
rule.ClassBody = function(node) {
if (node.body.length === 0) {
return;
}
checkPadding(node);
};
}
return rule;
}
};
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