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/**
* @fileoverview Rule to enforce spacing around embedded expressions of template strings
* @author Toru Nagashima
* @copyright 2016 Toru Nagashima. All rights reserved.
* See LICENSE file in root directory for full license.
*/
"use strict";
//------------------------------------------------------------------------------
// Requirements
//------------------------------------------------------------------------------
var astUtils = require("../ast-utils");
//------------------------------------------------------------------------------
// Helpers
//------------------------------------------------------------------------------
var OPEN_PAREN = /\$\{$/;
var CLOSE_PAREN = /^\}/;
//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------
module.exports = function(context) {
var sourceCode = context.getSourceCode();
var always = context.options[0] === "always";
var prefix = always ? "Expected" : "Unexpected";
/**
* Checks spacing before `}` of a given token.
* @param {Token} token - A token to check. This is a Template token.
* @returns {void}
*/
function checkSpacingBefore(token) {
var prevToken = sourceCode.getTokenBefore(token);
if (prevToken &&
CLOSE_PAREN.test(token.value) &&
astUtils.isTokenOnSameLine(prevToken, token) &&
sourceCode.isSpaceBetweenTokens(prevToken, token) !== always
) {
context.report({
loc: token.loc.start,
message: prefix + " space(s) before '}'.",
fix: function(fixer) {
if (always) {
return fixer.insertTextBefore(token, " ");
}
return fixer.removeRange([
prevToken.range[1],
token.range[0]
]);
}
});
}
}
/**
* Checks spacing after `${` of a given token.
* @param {Token} token - A token to check. This is a Template token.
* @returns {void}
*/
function checkSpacingAfter(token) {
var 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
},
message: prefix + " space(s) after '${'.",
fix: function(fixer) {
if (always) {
return fixer.insertTextAfter(token, " ");
}
return fixer.removeRange([
token.range[1],
nextToken.range[0]
]);
}
});
}
}
return {
TemplateElement: function(node) {
var token = sourceCode.getFirstToken(node);
checkSpacingBefore(token);
checkSpacingAfter(token);
}
};
};
module.exports.schema = [
{enum: ["always", "never"]}
];
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