mirror of
https://github.com/joelwmale/webhook-action.git
synced 2024-12-04 21:24:29 +01:00
496 lines
19 KiB
JavaScript
496 lines
19 KiB
JavaScript
|
/**
|
||
|
* @fileoverview Rule to flag statements without curly braces
|
||
|
* @author Nicholas C. Zakas
|
||
|
*/
|
||
|
"use strict";
|
||
|
|
||
|
//------------------------------------------------------------------------------
|
||
|
// Requirements
|
||
|
//------------------------------------------------------------------------------
|
||
|
|
||
|
const astUtils = require("./utils/ast-utils");
|
||
|
|
||
|
//------------------------------------------------------------------------------
|
||
|
// Rule Definition
|
||
|
//------------------------------------------------------------------------------
|
||
|
|
||
|
module.exports = {
|
||
|
meta: {
|
||
|
type: "suggestion",
|
||
|
|
||
|
docs: {
|
||
|
description: "enforce consistent brace style for all control statements",
|
||
|
category: "Best Practices",
|
||
|
recommended: false,
|
||
|
url: "https://eslint.org/docs/rules/curly"
|
||
|
},
|
||
|
|
||
|
schema: {
|
||
|
anyOf: [
|
||
|
{
|
||
|
type: "array",
|
||
|
items: [
|
||
|
{
|
||
|
enum: ["all"]
|
||
|
}
|
||
|
],
|
||
|
minItems: 0,
|
||
|
maxItems: 1
|
||
|
},
|
||
|
{
|
||
|
type: "array",
|
||
|
items: [
|
||
|
{
|
||
|
enum: ["multi", "multi-line", "multi-or-nest"]
|
||
|
},
|
||
|
{
|
||
|
enum: ["consistent"]
|
||
|
}
|
||
|
],
|
||
|
minItems: 0,
|
||
|
maxItems: 2
|
||
|
}
|
||
|
]
|
||
|
},
|
||
|
|
||
|
fixable: "code",
|
||
|
|
||
|
messages: {
|
||
|
missingCurlyAfter: "Expected { after '{{name}}'.",
|
||
|
missingCurlyAfterCondition: "Expected { after '{{name}}' condition.",
|
||
|
unexpectedCurlyAfter: "Unnecessary { after '{{name}}'.",
|
||
|
unexpectedCurlyAfterCondition: "Unnecessary { after '{{name}}' condition."
|
||
|
}
|
||
|
},
|
||
|
|
||
|
create(context) {
|
||
|
|
||
|
const multiOnly = (context.options[0] === "multi");
|
||
|
const multiLine = (context.options[0] === "multi-line");
|
||
|
const multiOrNest = (context.options[0] === "multi-or-nest");
|
||
|
const consistent = (context.options[1] === "consistent");
|
||
|
|
||
|
const sourceCode = context.getSourceCode();
|
||
|
|
||
|
//--------------------------------------------------------------------------
|
||
|
// Helpers
|
||
|
//--------------------------------------------------------------------------
|
||
|
|
||
|
/**
|
||
|
* Determines if a given node is a one-liner that's on the same line as it's preceding code.
|
||
|
* @param {ASTNode} node The node to check.
|
||
|
* @returns {boolean} True if the node is a one-liner that's on the same line as it's preceding code.
|
||
|
* @private
|
||
|
*/
|
||
|
function isCollapsedOneLiner(node) {
|
||
|
const before = sourceCode.getTokenBefore(node);
|
||
|
const last = sourceCode.getLastToken(node);
|
||
|
const lastExcludingSemicolon = astUtils.isSemicolonToken(last) ? sourceCode.getTokenBefore(last) : last;
|
||
|
|
||
|
return before.loc.start.line === lastExcludingSemicolon.loc.end.line;
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* Determines if a given node is a one-liner.
|
||
|
* @param {ASTNode} node The node to check.
|
||
|
* @returns {boolean} True if the node is a one-liner.
|
||
|
* @private
|
||
|
*/
|
||
|
function isOneLiner(node) {
|
||
|
if (node.type === "EmptyStatement") {
|
||
|
return true;
|
||
|
}
|
||
|
|
||
|
const first = sourceCode.getFirstToken(node);
|
||
|
const last = sourceCode.getLastToken(node);
|
||
|
const lastExcludingSemicolon = astUtils.isSemicolonToken(last) ? sourceCode.getTokenBefore(last) : last;
|
||
|
|
||
|
return first.loc.start.line === lastExcludingSemicolon.loc.end.line;
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* Determines if the given node is a lexical declaration (let, const, function, or class)
|
||
|
* @param {ASTNode} node The node to check
|
||
|
* @returns {boolean} True if the node is a lexical declaration
|
||
|
* @private
|
||
|
*/
|
||
|
function isLexicalDeclaration(node) {
|
||
|
if (node.type === "VariableDeclaration") {
|
||
|
return node.kind === "const" || node.kind === "let";
|
||
|
}
|
||
|
|
||
|
return node.type === "FunctionDeclaration" || node.type === "ClassDeclaration";
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* Checks if the given token is an `else` token or not.
|
||
|
* @param {Token} token The token to check.
|
||
|
* @returns {boolean} `true` if the token is an `else` token.
|
||
|
*/
|
||
|
function isElseKeywordToken(token) {
|
||
|
return token.value === "else" && token.type === "Keyword";
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* Gets the `else` keyword token of a given `IfStatement` node.
|
||
|
* @param {ASTNode} node A `IfStatement` node to get.
|
||
|
* @returns {Token} The `else` keyword token.
|
||
|
*/
|
||
|
function getElseKeyword(node) {
|
||
|
return node.alternate && sourceCode.getFirstTokenBetween(node.consequent, node.alternate, isElseKeywordToken);
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* Determines whether the given node has an `else` keyword token as the first token after.
|
||
|
* @param {ASTNode} node The node to check.
|
||
|
* @returns {boolean} `true` if the node is followed by an `else` keyword token.
|
||
|
*/
|
||
|
function isFollowedByElseKeyword(node) {
|
||
|
const nextToken = sourceCode.getTokenAfter(node);
|
||
|
|
||
|
return Boolean(nextToken) && isElseKeywordToken(nextToken);
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* Determines if a semicolon needs to be inserted after removing a set of curly brackets, in order to avoid a SyntaxError.
|
||
|
* @param {Token} closingBracket The } token
|
||
|
* @returns {boolean} `true` if a semicolon needs to be inserted after the last statement in the block.
|
||
|
*/
|
||
|
function needsSemicolon(closingBracket) {
|
||
|
const tokenBefore = sourceCode.getTokenBefore(closingBracket);
|
||
|
const tokenAfter = sourceCode.getTokenAfter(closingBracket);
|
||
|
const lastBlockNode = sourceCode.getNodeByRangeIndex(tokenBefore.range[0]);
|
||
|
|
||
|
if (astUtils.isSemicolonToken(tokenBefore)) {
|
||
|
|
||
|
// If the last statement already has a semicolon, don't add another one.
|
||
|
return false;
|
||
|
}
|
||
|
|
||
|
if (!tokenAfter) {
|
||
|
|
||
|
// If there are no statements after this block, there is no need to add a semicolon.
|
||
|
return false;
|
||
|
}
|
||
|
|
||
|
if (lastBlockNode.type === "BlockStatement" && lastBlockNode.parent.type !== "FunctionExpression" && lastBlockNode.parent.type !== "ArrowFunctionExpression") {
|
||
|
|
||
|
/*
|
||
|
* If the last node surrounded by curly brackets is a BlockStatement (other than a FunctionExpression or an ArrowFunctionExpression),
|
||
|
* don't insert a semicolon. Otherwise, the semicolon would be parsed as a separate statement, which would cause
|
||
|
* a SyntaxError if it was followed by `else`.
|
||
|
*/
|
||
|
return false;
|
||
|
}
|
||
|
|
||
|
if (tokenBefore.loc.end.line === tokenAfter.loc.start.line) {
|
||
|
|
||
|
// If the next token is on the same line, insert a semicolon.
|
||
|
return true;
|
||
|
}
|
||
|
|
||
|
if (/^[([/`+-]/u.test(tokenAfter.value)) {
|
||
|
|
||
|
// If the next token starts with a character that would disrupt ASI, insert a semicolon.
|
||
|
return true;
|
||
|
}
|
||
|
|
||
|
if (tokenBefore.type === "Punctuator" && (tokenBefore.value === "++" || tokenBefore.value === "--")) {
|
||
|
|
||
|
// If the last token is ++ or --, insert a semicolon to avoid disrupting ASI.
|
||
|
return true;
|
||
|
}
|
||
|
|
||
|
// Otherwise, do not insert a semicolon.
|
||
|
return false;
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* Determines whether the code represented by the given node contains an `if` statement
|
||
|
* that would become associated with an `else` keyword directly appended to that code.
|
||
|
*
|
||
|
* Examples where it returns `true`:
|
||
|
*
|
||
|
* if (a)
|
||
|
* foo();
|
||
|
*
|
||
|
* if (a) {
|
||
|
* foo();
|
||
|
* }
|
||
|
*
|
||
|
* if (a)
|
||
|
* foo();
|
||
|
* else if (b)
|
||
|
* bar();
|
||
|
*
|
||
|
* while (a)
|
||
|
* if (b)
|
||
|
* if(c)
|
||
|
* foo();
|
||
|
* else
|
||
|
* bar();
|
||
|
*
|
||
|
* Examples where it returns `false`:
|
||
|
*
|
||
|
* if (a)
|
||
|
* foo();
|
||
|
* else
|
||
|
* bar();
|
||
|
*
|
||
|
* while (a) {
|
||
|
* if (b)
|
||
|
* if(c)
|
||
|
* foo();
|
||
|
* else
|
||
|
* bar();
|
||
|
* }
|
||
|
*
|
||
|
* while (a)
|
||
|
* if (b) {
|
||
|
* if(c)
|
||
|
* foo();
|
||
|
* }
|
||
|
* else
|
||
|
* bar();
|
||
|
* @param {ASTNode} node Node representing the code to check.
|
||
|
* @returns {boolean} `true` if an `if` statement within the code would become associated with an `else` appended to that code.
|
||
|
*/
|
||
|
function hasUnsafeIf(node) {
|
||
|
switch (node.type) {
|
||
|
case "IfStatement":
|
||
|
if (!node.alternate) {
|
||
|
return true;
|
||
|
}
|
||
|
return hasUnsafeIf(node.alternate);
|
||
|
case "ForStatement":
|
||
|
case "ForInStatement":
|
||
|
case "ForOfStatement":
|
||
|
case "LabeledStatement":
|
||
|
case "WithStatement":
|
||
|
case "WhileStatement":
|
||
|
return hasUnsafeIf(node.body);
|
||
|
default:
|
||
|
return false;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* Determines whether the existing curly braces around the single statement are necessary to preserve the semantics of the code.
|
||
|
* The braces, which make the given block body, are necessary in either of the following situations:
|
||
|
*
|
||
|
* 1. The statement is a lexical declaration.
|
||
|
* 2. Without the braces, an `if` within the statement would become associated with an `else` after the closing brace:
|
||
|
*
|
||
|
* if (a) {
|
||
|
* if (b)
|
||
|
* foo();
|
||
|
* }
|
||
|
* else
|
||
|
* bar();
|
||
|
*
|
||
|
* if (a)
|
||
|
* while (b)
|
||
|
* while (c) {
|
||
|
* while (d)
|
||
|
* if (e)
|
||
|
* while(f)
|
||
|
* foo();
|
||
|
* }
|
||
|
* else
|
||
|
* bar();
|
||
|
* @param {ASTNode} node `BlockStatement` body with exactly one statement directly inside. The statement can have its own nested statements.
|
||
|
* @returns {boolean} `true` if the braces are necessary - removing them (replacing the given `BlockStatement` body with its single statement content)
|
||
|
* would change the semantics of the code or produce a syntax error.
|
||
|
*/
|
||
|
function areBracesNecessary(node) {
|
||
|
const statement = node.body[0];
|
||
|
|
||
|
return isLexicalDeclaration(statement) ||
|
||
|
hasUnsafeIf(statement) && isFollowedByElseKeyword(node);
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* Prepares to check the body of a node to see if it's a block statement.
|
||
|
* @param {ASTNode} node The node to report if there's a problem.
|
||
|
* @param {ASTNode} body The body node to check for blocks.
|
||
|
* @param {string} name The name to report if there's a problem.
|
||
|
* @param {{ condition: boolean }} opts Options to pass to the report functions
|
||
|
* @returns {Object} a prepared check object, with "actual", "expected", "check" properties.
|
||
|
* "actual" will be `true` or `false` whether the body is already a block statement.
|
||
|
* "expected" will be `true` or `false` if the body should be a block statement or not, or
|
||
|
* `null` if it doesn't matter, depending on the rule options. It can be modified to change
|
||
|
* the final behavior of "check".
|
||
|
* "check" will be a function reporting appropriate problems depending on the other
|
||
|
* properties.
|
||
|
*/
|
||
|
function prepareCheck(node, body, name, opts) {
|
||
|
const hasBlock = (body.type === "BlockStatement");
|
||
|
let expected = null;
|
||
|
|
||
|
if (hasBlock && (body.body.length !== 1 || areBracesNecessary(body))) {
|
||
|
expected = true;
|
||
|
} else if (multiOnly) {
|
||
|
expected = false;
|
||
|
} else if (multiLine) {
|
||
|
if (!isCollapsedOneLiner(body)) {
|
||
|
expected = true;
|
||
|
}
|
||
|
|
||
|
// otherwise, the body is allowed to have braces or not to have braces
|
||
|
|
||
|
} else if (multiOrNest) {
|
||
|
if (hasBlock) {
|
||
|
const statement = body.body[0];
|
||
|
const leadingCommentsInBlock = sourceCode.getCommentsBefore(statement);
|
||
|
|
||
|
expected = !isOneLiner(statement) || leadingCommentsInBlock.length > 0;
|
||
|
} else {
|
||
|
expected = !isOneLiner(body);
|
||
|
}
|
||
|
} else {
|
||
|
|
||
|
// default "all"
|
||
|
expected = true;
|
||
|
}
|
||
|
|
||
|
return {
|
||
|
actual: hasBlock,
|
||
|
expected,
|
||
|
check() {
|
||
|
if (this.expected !== null && this.expected !== this.actual) {
|
||
|
if (this.expected) {
|
||
|
context.report({
|
||
|
node,
|
||
|
loc: (name !== "else" ? node : getElseKeyword(node)).loc.start,
|
||
|
messageId: opts && opts.condition ? "missingCurlyAfterCondition" : "missingCurlyAfter",
|
||
|
data: {
|
||
|
name
|
||
|
},
|
||
|
fix: fixer => fixer.replaceText(body, `{${sourceCode.getText(body)}}`)
|
||
|
});
|
||
|
} else {
|
||
|
context.report({
|
||
|
node,
|
||
|
loc: (name !== "else" ? node : getElseKeyword(node)).loc.start,
|
||
|
messageId: opts && opts.condition ? "unexpectedCurlyAfterCondition" : "unexpectedCurlyAfter",
|
||
|
data: {
|
||
|
name
|
||
|
},
|
||
|
fix(fixer) {
|
||
|
|
||
|
/*
|
||
|
* `do while` expressions sometimes need a space to be inserted after `do`.
|
||
|
* e.g. `do{foo()} while (bar)` should be corrected to `do foo() while (bar)`
|
||
|
*/
|
||
|
const needsPrecedingSpace = node.type === "DoWhileStatement" &&
|
||
|
sourceCode.getTokenBefore(body).range[1] === body.range[0] &&
|
||
|
!astUtils.canTokensBeAdjacent("do", sourceCode.getFirstToken(body, { skip: 1 }));
|
||
|
|
||
|
const openingBracket = sourceCode.getFirstToken(body);
|
||
|
const closingBracket = sourceCode.getLastToken(body);
|
||
|
const lastTokenInBlock = sourceCode.getTokenBefore(closingBracket);
|
||
|
|
||
|
if (needsSemicolon(closingBracket)) {
|
||
|
|
||
|
/*
|
||
|
* If removing braces would cause a SyntaxError due to multiple statements on the same line (or
|
||
|
* change the semantics of the code due to ASI), don't perform a fix.
|
||
|
*/
|
||
|
return null;
|
||
|
}
|
||
|
|
||
|
const resultingBodyText = sourceCode.getText().slice(openingBracket.range[1], lastTokenInBlock.range[0]) +
|
||
|
sourceCode.getText(lastTokenInBlock) +
|
||
|
sourceCode.getText().slice(lastTokenInBlock.range[1], closingBracket.range[0]);
|
||
|
|
||
|
return fixer.replaceText(body, (needsPrecedingSpace ? " " : "") + resultingBodyText);
|
||
|
}
|
||
|
});
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
};
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* Prepares to check the bodies of a "if", "else if" and "else" chain.
|
||
|
* @param {ASTNode} node The first IfStatement node of the chain.
|
||
|
* @returns {Object[]} prepared checks for each body of the chain. See `prepareCheck` for more
|
||
|
* information.
|
||
|
*/
|
||
|
function prepareIfChecks(node) {
|
||
|
const preparedChecks = [];
|
||
|
|
||
|
for (let currentNode = node; currentNode; currentNode = currentNode.alternate) {
|
||
|
preparedChecks.push(prepareCheck(currentNode, currentNode.consequent, "if", { condition: true }));
|
||
|
if (currentNode.alternate && currentNode.alternate.type !== "IfStatement") {
|
||
|
preparedChecks.push(prepareCheck(currentNode, currentNode.alternate, "else"));
|
||
|
break;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
if (consistent) {
|
||
|
|
||
|
/*
|
||
|
* If any node should have or already have braces, make sure they
|
||
|
* all have braces.
|
||
|
* If all nodes shouldn't have braces, make sure they don't.
|
||
|
*/
|
||
|
const expected = preparedChecks.some(preparedCheck => {
|
||
|
if (preparedCheck.expected !== null) {
|
||
|
return preparedCheck.expected;
|
||
|
}
|
||
|
return preparedCheck.actual;
|
||
|
});
|
||
|
|
||
|
preparedChecks.forEach(preparedCheck => {
|
||
|
preparedCheck.expected = expected;
|
||
|
});
|
||
|
}
|
||
|
|
||
|
return preparedChecks;
|
||
|
}
|
||
|
|
||
|
//--------------------------------------------------------------------------
|
||
|
// Public
|
||
|
//--------------------------------------------------------------------------
|
||
|
|
||
|
return {
|
||
|
IfStatement(node) {
|
||
|
const parent = node.parent;
|
||
|
const isElseIf = parent.type === "IfStatement" && parent.alternate === node;
|
||
|
|
||
|
if (!isElseIf) {
|
||
|
|
||
|
// This is a top `if`, check the whole `if-else-if` chain
|
||
|
prepareIfChecks(node).forEach(preparedCheck => {
|
||
|
preparedCheck.check();
|
||
|
});
|
||
|
}
|
||
|
|
||
|
// Skip `else if`, it's already checked (when the top `if` was visited)
|
||
|
},
|
||
|
|
||
|
WhileStatement(node) {
|
||
|
prepareCheck(node, node.body, "while", { condition: true }).check();
|
||
|
},
|
||
|
|
||
|
DoWhileStatement(node) {
|
||
|
prepareCheck(node, node.body, "do").check();
|
||
|
},
|
||
|
|
||
|
ForStatement(node) {
|
||
|
prepareCheck(node, node.body, "for", { condition: true }).check();
|
||
|
},
|
||
|
|
||
|
ForInStatement(node) {
|
||
|
prepareCheck(node, node.body, "for-in").check();
|
||
|
},
|
||
|
|
||
|
ForOfStatement(node) {
|
||
|
prepareCheck(node, node.body, "for-of").check();
|
||
|
}
|
||
|
};
|
||
|
}
|
||
|
};
|