298 lines
10 KiB
JavaScript
298 lines
10 KiB
JavaScript
|
/**
|
||
|
|
* @fileoverview A rule to choose between single and double quote marks
|
||
|
|
* @author Matt DuVall <http://www.mattduvall.com/>, Brandon Payton
|
||
|
|
*/
|
||
|
|
|
||
|
|
"use strict";
|
||
|
|
|
||
|
|
//------------------------------------------------------------------------------
|
||
|
|
// Requirements
|
||
|
|
//------------------------------------------------------------------------------
|
||
|
|
|
||
|
|
const astUtils = require("../ast-utils");
|
||
|
|
|
||
|
|
//------------------------------------------------------------------------------
|
||
|
|
// Constants
|
||
|
|
//------------------------------------------------------------------------------
|
||
|
|
|
||
|
|
const QUOTE_SETTINGS = {
|
||
|
|
double: {
|
||
|
|
quote: "\"",
|
||
|
|
alternateQuote: "'",
|
||
|
|
description: "doublequote"
|
||
|
|
},
|
||
|
|
single: {
|
||
|
|
quote: "'",
|
||
|
|
alternateQuote: "\"",
|
||
|
|
description: "singlequote"
|
||
|
|
},
|
||
|
|
backtick: {
|
||
|
|
quote: "`",
|
||
|
|
alternateQuote: "\"",
|
||
|
|
description: "backtick"
|
||
|
|
}
|
||
|
|
};
|
||
|
|
|
||
|
|
// An unescaped newline is a newline preceded by an even number of backslashes.
|
||
|
|
const UNESCAPED_LINEBREAK_PATTERN = new RegExp(String.raw`(^|[^\\])(\\\\)*[${Array.from(astUtils.LINEBREAKS).join("")}]`);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Switches quoting of javascript string between ' " and `
|
||
|
|
* escaping and unescaping as necessary.
|
||
|
|
* Only escaping of the minimal set of characters is changed.
|
||
|
|
* Note: escaping of newlines when switching from backtick to other quotes is not handled.
|
||
|
|
* @param {string} str - A string to convert.
|
||
|
|
* @returns {string} The string with changed quotes.
|
||
|
|
* @private
|
||
|
|
*/
|
||
|
|
QUOTE_SETTINGS.double.convert =
|
||
|
|
QUOTE_SETTINGS.single.convert =
|
||
|
|
QUOTE_SETTINGS.backtick.convert = function(str) {
|
||
|
|
const newQuote = this.quote;
|
||
|
|
const oldQuote = str[0];
|
||
|
|
|
||
|
|
if (newQuote === oldQuote) {
|
||
|
|
return str;
|
||
|
|
}
|
||
|
|
return newQuote + str.slice(1, -1).replace(/\\(\${|\r\n?|\n|.)|["'`]|\${|(\r\n?|\n)/g, (match, escaped, newline) => {
|
||
|
|
if (escaped === oldQuote || oldQuote === "`" && escaped === "${") {
|
||
|
|
return escaped; // unescape
|
||
|
|
}
|
||
|
|
if (match === newQuote || newQuote === "`" && match === "${") {
|
||
|
|
return `\\${match}`; // escape
|
||
|
|
}
|
||
|
|
if (newline && oldQuote === "`") {
|
||
|
|
return "\\n"; // escape newlines
|
||
|
|
}
|
||
|
|
return match;
|
||
|
|
}) + newQuote;
|
||
|
|
};
|
||
|
|
|
||
|
|
const AVOID_ESCAPE = "avoid-escape";
|
||
|
|
|
||
|
|
//------------------------------------------------------------------------------
|
||
|
|
// Rule Definition
|
||
|
|
//------------------------------------------------------------------------------
|
||
|
|
|
||
|
|
module.exports = {
|
||
|
|
meta: {
|
||
|
|
docs: {
|
||
|
|
description: "enforce the consistent use of either backticks, double, or single quotes",
|
||
|
|
category: "Stylistic Issues",
|
||
|
|
recommended: false,
|
||
|
|
url: "https://eslint.org/docs/rules/quotes"
|
||
|
|
},
|
||
|
|
|
||
|
|
fixable: "code",
|
||
|
|
|
||
|
|
schema: [
|
||
|
|
{
|
||
|
|
enum: ["single", "double", "backtick"]
|
||
|
|
},
|
||
|
|
{
|
||
|
|
anyOf: [
|
||
|
|
{
|
||
|
|
enum: ["avoid-escape"]
|
||
|
|
},
|
||
|
|
{
|
||
|
|
type: "object",
|
||
|
|
properties: {
|
||
|
|
avoidEscape: {
|
||
|
|
type: "boolean"
|
||
|
|
},
|
||
|
|
allowTemplateLiterals: {
|
||
|
|
type: "boolean"
|
||
|
|
}
|
||
|
|
},
|
||
|
|
additionalProperties: false
|
||
|
|
}
|
||
|
|
]
|
||
|
|
}
|
||
|
|
]
|
||
|
|
},
|
||
|
|
|
||
|
|
create(context) {
|
||
|
|
|
||
|
|
const quoteOption = context.options[0],
|
||
|
|
settings = QUOTE_SETTINGS[quoteOption || "double"],
|
||
|
|
options = context.options[1],
|
||
|
|
allowTemplateLiterals = options && options.allowTemplateLiterals === true,
|
||
|
|
sourceCode = context.getSourceCode();
|
||
|
|
let avoidEscape = options && options.avoidEscape === true;
|
||
|
|
|
||
|
|
// deprecated
|
||
|
|
if (options === AVOID_ESCAPE) {
|
||
|
|
avoidEscape = true;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Determines if a given node is part of JSX syntax.
|
||
|
|
*
|
||
|
|
* This function returns `true` in the following cases:
|
||
|
|
*
|
||
|
|
* - `<div className="foo"></div>` ... If the literal is an attribute value, the parent of the literal is `JSXAttribute`.
|
||
|
|
* - `<div>foo</div>` ... If the literal is a text content, the parent of the literal is `JSXElement`.
|
||
|
|
*
|
||
|
|
* In particular, this function returns `false` in the following cases:
|
||
|
|
*
|
||
|
|
* - `<div className={"foo"}></div>`
|
||
|
|
* - `<div>{"foo"}</div>`
|
||
|
|
*
|
||
|
|
* In both cases, inside of the braces is handled as normal JavaScript.
|
||
|
|
* The braces are `JSXExpressionContainer` nodes.
|
||
|
|
*
|
||
|
|
* @param {ASTNode} node The Literal node to check.
|
||
|
|
* @returns {boolean} True if the node is a part of JSX, false if not.
|
||
|
|
* @private
|
||
|
|
*/
|
||
|
|
function isJSXLiteral(node) {
|
||
|
|
return node.parent.type === "JSXAttribute" || node.parent.type === "JSXElement";
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Checks whether or not a given node is a directive.
|
||
|
|
* The directive is a `ExpressionStatement` which has only a string literal.
|
||
|
|
* @param {ASTNode} node - A node to check.
|
||
|
|
* @returns {boolean} Whether or not the node is a directive.
|
||
|
|
* @private
|
||
|
|
*/
|
||
|
|
function isDirective(node) {
|
||
|
|
return (
|
||
|
|
node.type === "ExpressionStatement" &&
|
||
|
|
node.expression.type === "Literal" &&
|
||
|
|
typeof node.expression.value === "string"
|
||
|
|
);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Checks whether or not a given node is a part of directive prologues.
|
||
|
|
* See also: http://www.ecma-international.org/ecma-262/6.0/#sec-directive-prologues-and-the-use-strict-directive
|
||
|
|
* @param {ASTNode} node - A node to check.
|
||
|
|
* @returns {boolean} Whether or not the node is a part of directive prologues.
|
||
|
|
* @private
|
||
|
|
*/
|
||
|
|
function isPartOfDirectivePrologue(node) {
|
||
|
|
const block = node.parent.parent;
|
||
|
|
|
||
|
|
if (block.type !== "Program" && (block.type !== "BlockStatement" || !astUtils.isFunction(block.parent))) {
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
// Check the node is at a prologue.
|
||
|
|
for (let i = 0; i < block.body.length; ++i) {
|
||
|
|
const statement = block.body[i];
|
||
|
|
|
||
|
|
if (statement === node.parent) {
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
if (!isDirective(statement)) {
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Checks whether or not a given node is allowed as non backtick.
|
||
|
|
* @param {ASTNode} node - A node to check.
|
||
|
|
* @returns {boolean} Whether or not the node is allowed as non backtick.
|
||
|
|
* @private
|
||
|
|
*/
|
||
|
|
function isAllowedAsNonBacktick(node) {
|
||
|
|
const parent = node.parent;
|
||
|
|
|
||
|
|
switch (parent.type) {
|
||
|
|
|
||
|
|
// Directive Prologues.
|
||
|
|
case "ExpressionStatement":
|
||
|
|
return isPartOfDirectivePrologue(node);
|
||
|
|
|
||
|
|
// LiteralPropertyName.
|
||
|
|
case "Property":
|
||
|
|
case "MethodDefinition":
|
||
|
|
return parent.key === node && !parent.computed;
|
||
|
|
|
||
|
|
// ModuleSpecifier.
|
||
|
|
case "ImportDeclaration":
|
||
|
|
case "ExportNamedDeclaration":
|
||
|
|
case "ExportAllDeclaration":
|
||
|
|
return parent.source === node;
|
||
|
|
|
||
|
|
// Others don't allow.
|
||
|
|
default:
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
return {
|
||
|
|
|
||
|
|
Literal(node) {
|
||
|
|
const val = node.value,
|
||
|
|
rawVal = node.raw;
|
||
|
|
|
||
|
|
if (settings && typeof val === "string") {
|
||
|
|
let isValid = (quoteOption === "backtick" && isAllowedAsNonBacktick(node)) ||
|
||
|
|
isJSXLiteral(node) ||
|
||
|
|
astUtils.isSurroundedBy(rawVal, settings.quote);
|
||
|
|
|
||
|
|
if (!isValid && avoidEscape) {
|
||
|
|
isValid = astUtils.isSurroundedBy(rawVal, settings.alternateQuote) && rawVal.indexOf(settings.quote) >= 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (!isValid) {
|
||
|
|
context.report({
|
||
|
|
node,
|
||
|
|
message: "Strings must use {{description}}.",
|
||
|
|
data: {
|
||
|
|
description: settings.description
|
||
|
|
},
|
||
|
|
fix(fixer) {
|
||
|
|
return fixer.replaceText(node, settings.convert(node.raw));
|
||
|
|
}
|
||
|
|
});
|
||
|
|
}
|
||
|
|
}
|
||
|
|
},
|
||
|
|
|
||
|
|
TemplateLiteral(node) {
|
||
|
|
|
||
|
|
// If backticks are expected or it's a tagged template, then this shouldn't throw an errors
|
||
|
|
if (
|
||
|
|
allowTemplateLiterals ||
|
||
|
|
quoteOption === "backtick" ||
|
||
|
|
node.parent.type === "TaggedTemplateExpression" && node === node.parent.quasi
|
||
|
|
) {
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
// A warning should be produced if the template literal only has one TemplateElement, and has no unescaped newlines.
|
||
|
|
const shouldWarn = node.quasis.length === 1 && !UNESCAPED_LINEBREAK_PATTERN.test(node.quasis[0].value.raw);
|
||
|
|
|
||
|
|
if (shouldWarn) {
|
||
|
|
context.report({
|
||
|
|
node,
|
||
|
|
message: "Strings must use {{description}}.",
|
||
|
|
data: {
|
||
|
|
description: settings.description
|
||
|
|
},
|
||
|
|
fix(fixer) {
|
||
|
|
if (isPartOfDirectivePrologue(node)) {
|
||
|
|
|
||
|
|
/*
|
||
|
|
* TemplateLiterals in a directive prologue aren't actually directives, but if they're
|
||
|
|
* in the directive prologue, then fixing them might turn them into directives and change
|
||
|
|
* the behavior of the code.
|
||
|
|
*/
|
||
|
|
return null;
|
||
|
|
}
|
||
|
|
return fixer.replaceText(node, settings.convert(sourceCode.getText(node)));
|
||
|
|
}
|
||
|
|
});
|
||
|
|
}
|
||
|
|
}
|
||
|
|
};
|
||
|
|
|
||
|
|
}
|
||
|
|
};
|