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app_vue/node_modules/eslint/lib/rules/newline-per-chained-call.js

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+/**
+ * @fileoverview Rule to ensure newline per method call when chaining calls
+ * @author Rajendra Patil
+ * @author Burak Yigit Kaya
+ */
+
+"use strict";
+
+const astUtils = require("./utils/ast-utils");
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+module.exports = {
+    meta: {
+        type: "layout",
+
+        docs: {
+            description: "require a newline after each call in a method chain",
+            category: "Stylistic Issues",
+            recommended: false,
+            url: "https://eslint.org/docs/rules/newline-per-chained-call"
+        },
+
+        fixable: "whitespace",
+
+        schema: [{
+            type: "object",
+            properties: {
+                ignoreChainWithDepth: {
+                    type: "integer",
+                    minimum: 1,
+                    maximum: 10,
+                    default: 2
+                }
+            },
+            additionalProperties: false
+        }],
+        messages: {
+            expected: "Expected line break before `{{callee}}`."
+        }
+    },
+
+    create(context) {
+
+        const options = context.options[0] || {},
+            ignoreChainWithDepth = options.ignoreChainWithDepth || 2;
+
+        const sourceCode = context.getSourceCode();
+
+        /**
+         * Get the prefix of a given MemberExpression node.
+         * If the MemberExpression node is a computed value it returns a
+         * left bracket. If not it returns a period.
+         * @param  {ASTNode} node A MemberExpression node to get
+         * @returns {string} The prefix of the node.
+         */
+        function getPrefix(node) {
+            if (node.computed) {
+                if (node.optional) {
+                    return "?.[";
+                }
+                return "[";
+            }
+            if (node.optional) {
+                return "?.";
+            }
+            return ".";
+        }
+
+        /**
+         * Gets the property text of a given MemberExpression node.
+         * If the text is multiline, this returns only the first line.
+         * @param {ASTNode} node A MemberExpression node to get.
+         * @returns {string} The property text of the node.
+         */
+        function getPropertyText(node) {
+            const prefix = getPrefix(node);
+            const lines = sourceCode.getText(node.property).split(astUtils.LINEBREAK_MATCHER);
+            const suffix = node.computed && lines.length === 1 ? "]" : "";
+
+            return prefix + lines[0] + suffix;
+        }
+
+        return {
+            "CallExpression:exit"(node) {
+                const callee = astUtils.skipChainExpression(node.callee);
+
+                if (callee.type !== "MemberExpression") {
+                    return;
+                }
+
+                let parent = astUtils.skipChainExpression(callee.object);
+                let depth = 1;
+
+                while (parent && parent.callee) {
+                    depth += 1;
+                    parent = astUtils.skipChainExpression(astUtils.skipChainExpression(parent.callee).object);
+                }
+
+                if (depth > ignoreChainWithDepth && astUtils.isTokenOnSameLine(callee.object, callee.property)) {
+                    const firstTokenAfterObject = sourceCode.getTokenAfter(callee.object, astUtils.isNotClosingParenToken);
+
+                    context.report({
+                        node: callee.property,
+                        loc: {
+                            start: firstTokenAfterObject.loc.start,
+                            end: callee.loc.end
+                        },
+                        messageId: "expected",
+                        data: {
+                            callee: getPropertyText(callee)
+                        },
+                        fix(fixer) {
+                            return fixer.insertTextBefore(firstTokenAfterObject, "\n");
+                        }
+                    });
+                }
+            }
+        };
+    }
+};