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/**
* @fileoverview Rule to flag missing semicolons.
* @author Nicholas C. Zakas
*/
"use strict";
//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------
module.exports = {
meta: {
docs: {
description: "require or disallow semicolons instead of ASI",
category: "Stylistic Issues",
recommended: false
},
fixable: "code",
schema: {
anyOf: [
{
type: "array",
items: [
{
enum: ["never"]
}
],
minItems: 0,
maxItems: 1
},
{
type: "array",
items: [
{
enum: ["always"]
},
{
type: "object",
properties: {
omitLastInOneLineBlock: {type: "boolean"}
},
additionalProperties: false
}
],
minItems: 0,
maxItems: 2
}
]
}
},
create: function(context) {
const OPT_OUT_PATTERN = /[\[\(\/\+\-]/; // One of [(/+-
const options = context.options[1];
const never = context.options[0] === "never",
exceptOneLine = options && options.omitLastInOneLineBlock === true,
sourceCode = context.getSourceCode();
//--------------------------------------------------------------------------
// Helpers
//--------------------------------------------------------------------------
/**
* Reports a semicolon error with appropriate location and message.
* @param {ASTNode} node The node with an extra or missing semicolon.
* @param {boolean} missing True if the semicolon is missing.
* @returns {void}
*/
function report(node, missing) {
const lastToken = sourceCode.getLastToken(node);
let message,
fix,
loc = lastToken.loc;
if (!missing) {
message = "Missing semicolon.";
loc = loc.end;
fix = function(fixer) {
return fixer.insertTextAfter(lastToken, ";");
};
} else {
message = "Extra semicolon.";
loc = loc.start;
fix = function(fixer) {
return fixer.remove(lastToken);
};
}
context.report({
node: node,
loc: loc,
message: message,
fix: fix
});
}
/**
* Checks whether a token is a semicolon punctuator.
* @param {Token} token The token.
* @returns {boolean} True if token is a semicolon punctuator.
*/
function isSemicolon(token) {
return (token.type === "Punctuator" && token.value === ";");
}
/**
* Check if a semicolon is unnecessary, only true if:
* - next token is on a new line and is not one of the opt-out tokens
* - next token is a valid statement divider
* @param {Token} lastToken last token of current node.
* @returns {boolean} whether the semicolon is unnecessary.
*/
function isUnnecessarySemicolon(lastToken) {
if (!isSemicolon(lastToken)) {
return false;
}
const nextToken = sourceCode.getTokenAfter(lastToken);
if (!nextToken) {
return true;
}
const lastTokenLine = lastToken.loc.end.line;
const nextTokenLine = nextToken.loc.start.line;
const isOptOutToken = OPT_OUT_PATTERN.test(nextToken.value);
const isDivider = (nextToken.value === "}" || nextToken.value === ";");
return (lastTokenLine !== nextTokenLine && !isOptOutToken) || isDivider;
}
/**
* Checks a node to see if it's in a one-liner block statement.
* @param {ASTNode} node The node to check.
* @returns {boolean} whether the node is in a one-liner block statement.
*/
function isOneLinerBlock(node) {
const nextToken = sourceCode.getTokenAfter(node);
if (!nextToken || nextToken.value !== "}") {
return false;
}
const parent = node.parent;
return parent && parent.type === "BlockStatement" &&
parent.loc.start.line === parent.loc.end.line;
}
/**
* Checks a node to see if it's followed by a semicolon.
* @param {ASTNode} node The node to check.
* @returns {void}
*/
function checkForSemicolon(node) {
const lastToken = sourceCode.getLastToken(node);
if (never) {
if (isUnnecessarySemicolon(lastToken)) {
report(node, true);
}
} else {
if (!isSemicolon(lastToken)) {
if (!exceptOneLine || !isOneLinerBlock(node)) {
report(node);
}
} else {
if (exceptOneLine && isOneLinerBlock(node)) {
report(node, true);
}
}
}
}
/**
* Checks to see if there's a semicolon after a variable declaration.
* @param {ASTNode} node The node to check.
* @returns {void}
*/
function checkForSemicolonForVariableDeclaration(node) {
const ancestors = context.getAncestors(),
parentIndex = ancestors.length - 1,
parent = ancestors[parentIndex];
if ((parent.type !== "ForStatement" || parent.init !== node) &&
(!/^For(?:In|Of)Statement/.test(parent.type) || parent.left !== node)
) {
checkForSemicolon(node);
}
}
//--------------------------------------------------------------------------
// Public API
//--------------------------------------------------------------------------
return {
VariableDeclaration: checkForSemicolonForVariableDeclaration,
ExpressionStatement: checkForSemicolon,
ReturnStatement: checkForSemicolon,
ThrowStatement: checkForSemicolon,
DoWhileStatement: checkForSemicolon,
DebuggerStatement: checkForSemicolon,
BreakStatement: checkForSemicolon,
ContinueStatement: checkForSemicolon,
ImportDeclaration: checkForSemicolon,
ExportAllDeclaration: checkForSemicolon,
ExportNamedDeclaration: function(node) {
if (!node.declaration) {
checkForSemicolon(node);
}
},
ExportDefaultDeclaration: function(node) {
if (!/(?:Class|Function)Declaration/.test(node.declaration.type)) {
checkForSemicolon(node);
}
}
};
}
};
|
