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node_modules/eslint/lib/rules/template-curly-spacing.js

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+/**
+ * @fileoverview Rule to enforce spacing around embedded expressions of template strings
+ * @author Toru Nagashima
+ */
+
+"use strict";
+
+//------------------------------------------------------------------------------
+// Requirements
+//------------------------------------------------------------------------------
+
+const astUtils = require("./utils/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);
+            }
+        };
+    }
+};