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/**
* @fileoverview Rule to enforce spacing around embedded expressions of template strings
* @author Toru Nagashima
*/
"use strict";
//------------------------------------------------------------------------------
// Requirements
//------------------------------------------------------------------------------
const astUtils = require("../util/ast-utils");
//------------------------------------------------------------------------------
// Helpers
//------------------------------------------------------------------------------
const OPEN_PAREN = /\$\{$/u;
const CLOSE_PAREN = /^\}/u;
//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------
module.exports = {
meta: {
type: "layout",
docs: {
description: "require or disallow spacing around embedded expressions of template strings",
category: "ECMAScript 6",
recommended: false,
url: "https://eslint.org/docs/rules/template-curly-spacing"
},
fixable: "whitespace",
schema: [
{ enum: ["always", "never"] }
],
messages: {
expectedBefore: "Expected space(s) before '}'.",
expectedAfter: "Expected space(s) after '${'.",
unexpectedBefore: "Unexpected space(s) before '}'.",
unexpectedAfter: "Unexpected space(s) after '${'."
}
},
create(context) {
const sourceCode = context.getSourceCode();
const always = context.options[0] === "always";
const prefix = always ? "expected" : "unexpected";
/**
* Checks spacing before `}` of a given token.
* @param {Token} token - A token to check. This is a Template token.
* @returns {void}
*/
function checkSpacingBefore(token) {
const prevToken = sourceCode.getTokenBefore(token);
if (prevToken &&
CLOSE_PAREN.test(token.value) &&
astUtils.isTokenOnSameLine(prevToken, token) &&
sourceCode.isSpaceBetweenTokens(prevToken, token) !== always
) {
context.report({
loc: token.loc.start,
messageId: `${prefix}Before`,
fix(fixer) {
if (always) {
return fixer.insertTextBefore(token, " ");
}
return fixer.removeRange([
prevToken.range[1],
token.range[0]
]);
}
});
}
}
/**
* Checks spacing after `${` of a given token.
* @param {Token} token - A token to check. This is a Template token.
* @returns {void}
*/
function checkSpacingAfter(token) {
const nextToken = sourceCode.getTokenAfter(token);
if (nextToken &&
OPEN_PAREN.test(token.value) &&
astUtils.isTokenOnSameLine(token, nextToken) &&
sourceCode.isSpaceBetweenTokens(token, nextToken) !== always
) {
context.report({
loc: {
line: token.loc.end.line,
column: token.loc.end.column - 2
},
messageId: `${prefix}After`,
fix(fixer) {
if (always) {
return fixer.insertTextAfter(token, " ");
}
return fixer.removeRange([
token.range[1],
nextToken.range[0]
]);
}
});
}
}
return {
TemplateElement(node) {
const token = sourceCode.getFirstToken(node);
checkSpacingBefore(token);
checkSpacingAfter(token);
}
};
}
};