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node_modules/eslint-plugin-react/lib/rules/jsx-equals-spacing.js

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+/**
+ * @fileoverview Disallow or enforce spaces around equal signs in JSX attributes.
+ * @author ryym
+ */
+
+'use strict';
+
+const docsUrl = require('../util/docsUrl');
+
+// ------------------------------------------------------------------------------
+// Rule Definition
+// ------------------------------------------------------------------------------
+
+module.exports = {
+  meta: {
+    docs: {
+      description: 'Disallow or enforce spaces around equal signs in JSX attributes',
+      category: 'Stylistic Issues',
+      recommended: false,
+      url: docsUrl('jsx-equals-spacing')
+    },
+    fixable: 'code',
+
+    schema: [{
+      enum: ['always', 'never']
+    }]
+  },
+
+  create(context) {
+    const config = context.options[0];
+
+    /**
+     * Determines a given attribute node has an equal sign.
+     * @param {ASTNode} attrNode - The attribute node.
+     * @returns {boolean} Whether or not the attriute node has an equal sign.
+     */
+    function hasEqual(attrNode) {
+      return attrNode.type !== 'JSXSpreadAttribute' && attrNode.value !== null;
+    }
+
+    // --------------------------------------------------------------------------
+    // Public
+    // --------------------------------------------------------------------------
+
+    return {
+      JSXOpeningElement(node) {
+        node.attributes.forEach((attrNode) => {
+          if (!hasEqual(attrNode)) {
+            return;
+          }
+
+          const sourceCode = context.getSourceCode();
+          const equalToken = sourceCode.getTokenAfter(attrNode.name);
+          const spacedBefore = sourceCode.isSpaceBetweenTokens(attrNode.name, equalToken);
+          const spacedAfter = sourceCode.isSpaceBetweenTokens(equalToken, attrNode.value);
+
+          switch (config) {
+            default:
+            case 'never':
+              if (spacedBefore) {
+                context.report({
+                  node: attrNode,
+                  loc: equalToken.loc.start,
+                  message: 'There should be no space before \'=\'',
+                  fix(fixer) {
+                    return fixer.removeRange([attrNode.name.range[1], equalToken.range[0]]);
+                  }
+                });
+              }
+              if (spacedAfter) {
+                context.report({
+                  node: attrNode,
+                  loc: equalToken.loc.start,
+                  message: 'There should be no space after \'=\'',
+                  fix(fixer) {
+                    return fixer.removeRange([equalToken.range[1], attrNode.value.range[0]]);
+                  }
+                });
+              }
+              break;
+            case 'always':
+              if (!spacedBefore) {
+                context.report({
+                  node: attrNode,
+                  loc: equalToken.loc.start,
+                  message: 'A space is required before \'=\'',
+                  fix(fixer) {
+                    return fixer.insertTextBefore(equalToken, ' ');
+                  }
+                });
+              }
+              if (!spacedAfter) {
+                context.report({
+                  node: attrNode,
+                  loc: equalToken.loc.start,
+                  message: 'A space is required after \'=\'',
+                  fix(fixer) {
+                    return fixer.insertTextAfter(equalToken, ' ');
+                  }
+                });
+              }
+              break;
+          }
+        });
+      }
+    };
+  }
+};