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app_vue/node_modules/eslint/lib/rules/quotes.js

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+/**
+ * @fileoverview A rule to choose between single and double quote marks
+ * @author Matt DuVall <http://www.mattduvall.com/>, Brandon Payton
+ */
+
+"use strict";
+
+//------------------------------------------------------------------------------
+// Requirements
+//------------------------------------------------------------------------------
+
+const astUtils = require("./utils/ast-utils");
+
+//------------------------------------------------------------------------------
+// Constants
+//------------------------------------------------------------------------------
+
+const QUOTE_SETTINGS = {
+    double: {
+        quote: "\"",
+        alternateQuote: "'",
+        description: "doublequote"
+    },
+    single: {
+        quote: "'",
+        alternateQuote: "\"",
+        description: "singlequote"
+    },
+    backtick: {
+        quote: "`",
+        alternateQuote: "\"",
+        description: "backtick"
+    }
+};
+
+// An unescaped newline is a newline preceded by an even number of backslashes.
+const UNESCAPED_LINEBREAK_PATTERN = new RegExp(String.raw`(^|[^\\])(\\\\)*[${Array.from(astUtils.LINEBREAKS).join("")}]`, "u");
+
+/**
+ * Switches quoting of javascript string between ' " and `
+ * escaping and unescaping as necessary.
+ * Only escaping of the minimal set of characters is changed.
+ * Note: escaping of newlines when switching from backtick to other quotes is not handled.
+ * @param {string} str A string to convert.
+ * @returns {string} The string with changed quotes.
+ * @private
+ */
+QUOTE_SETTINGS.double.convert =
+QUOTE_SETTINGS.single.convert =
+QUOTE_SETTINGS.backtick.convert = function(str) {
+    const newQuote = this.quote;
+    const oldQuote = str[0];
+
+    if (newQuote === oldQuote) {
+        return str;
+    }
+    return newQuote + str.slice(1, -1).replace(/\\(\$\{|\r\n?|\n|.)|["'`]|\$\{|(\r\n?|\n)/gu, (match, escaped, newline) => {
+        if (escaped === oldQuote || oldQuote === "`" && escaped === "${") {
+            return escaped; // unescape
+        }
+        if (match === newQuote || newQuote === "`" && match === "${") {
+            return `\\${match}`; // escape
+        }
+        if (newline && oldQuote === "`") {
+            return "\\n"; // escape newlines
+        }
+        return match;
+    }) + newQuote;
+};
+
+const AVOID_ESCAPE = "avoid-escape";
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+module.exports = {
+    meta: {
+        type: "layout",
+
+        docs: {
+            description: "enforce the consistent use of either backticks, double, or single quotes",
+            category: "Stylistic Issues",
+            recommended: false,
+            url: "https://eslint.org/docs/rules/quotes"
+        },
+
+        fixable: "code",
+
+        schema: [
+            {
+                enum: ["single", "double", "backtick"]
+            },
+            {
+                anyOf: [
+                    {
+                        enum: ["avoid-escape"]
+                    },
+                    {
+                        type: "object",
+                        properties: {
+                            avoidEscape: {
+                                type: "boolean"
+                            },
+                            allowTemplateLiterals: {
+                                type: "boolean"
+                            }
+                        },
+                        additionalProperties: false
+                    }
+                ]
+            }
+        ],
+
+        messages: {
+            wrongQuotes: "Strings must use {{description}}."
+        }
+    },
+
+    create(context) {
+
+        const quoteOption = context.options[0],
+            settings = QUOTE_SETTINGS[quoteOption || "double"],
+            options = context.options[1],
+            allowTemplateLiterals = options && options.allowTemplateLiterals === true,
+            sourceCode = context.getSourceCode();
+        let avoidEscape = options && options.avoidEscape === true;
+
+        // deprecated
+        if (options === AVOID_ESCAPE) {
+            avoidEscape = true;
+        }
+
+        /**
+         * Determines if a given node is part of JSX syntax.
+         *
+         * This function returns `true` in the following cases:
+         *
+         * - `<div className="foo"></div>` ... If the literal is an attribute value, the parent of the literal is `JSXAttribute`.
+         * - `<div>foo</div>` ... If the literal is a text content, the parent of the literal is `JSXElement`.
+         * - `<>foo</>` ... If the literal is a text content, the parent of the literal is `JSXFragment`.
+         *
+         * In particular, this function returns `false` in the following cases:
+         *
+         * - `<div className={"foo"}></div>`
+         * - `<div>{"foo"}</div>`
+         *
+         * In both cases, inside of the braces is handled as normal JavaScript.
+         * The braces are `JSXExpressionContainer` nodes.
+         * @param {ASTNode} node The Literal node to check.
+         * @returns {boolean} True if the node is a part of JSX, false if not.
+         * @private
+         */
+        function isJSXLiteral(node) {
+            return node.parent.type === "JSXAttribute" || node.parent.type === "JSXElement" || node.parent.type === "JSXFragment";
+        }
+
+        /**
+         * Checks whether or not a given node is a directive.
+         * The directive is a `ExpressionStatement` which has only a string literal.
+         * @param {ASTNode} node A node to check.
+         * @returns {boolean} Whether or not the node is a directive.
+         * @private
+         */
+        function isDirective(node) {
+            return (
+                node.type === "ExpressionStatement" &&
+                node.expression.type === "Literal" &&
+                typeof node.expression.value === "string"
+            );
+        }
+
+        /**
+         * Checks whether or not a given node is a part of directive prologues.
+         * See also: http://www.ecma-international.org/ecma-262/6.0/#sec-directive-prologues-and-the-use-strict-directive
+         * @param {ASTNode} node A node to check.
+         * @returns {boolean} Whether or not the node is a part of directive prologues.
+         * @private
+         */
+        function isPartOfDirectivePrologue(node) {
+            const block = node.parent.parent;
+
+            if (block.type !== "Program" && (block.type !== "BlockStatement" || !astUtils.isFunction(block.parent))) {
+                return false;
+            }
+
+            // Check the node is at a prologue.
+            for (let i = 0; i < block.body.length; ++i) {
+                const statement = block.body[i];
+
+                if (statement === node.parent) {
+                    return true;
+                }
+                if (!isDirective(statement)) {
+                    break;
+                }
+            }
+
+            return false;
+        }
+
+        /**
+         * Checks whether or not a given node is allowed as non backtick.
+         * @param {ASTNode} node A node to check.
+         * @returns {boolean} Whether or not the node is allowed as non backtick.
+         * @private
+         */
+        function isAllowedAsNonBacktick(node) {
+            const parent = node.parent;
+
+            switch (parent.type) {
+
+                // Directive Prologues.
+                case "ExpressionStatement":
+                    return isPartOfDirectivePrologue(node);
+
+                // LiteralPropertyName.
+                case "Property":
+                case "MethodDefinition":
+                    return parent.key === node && !parent.computed;
+
+                // ModuleSpecifier.
+                case "ImportDeclaration":
+                case "ExportNamedDeclaration":
+                case "ExportAllDeclaration":
+                    return parent.source === node;
+
+                // Others don't allow.
+                default:
+                    return false;
+            }
+        }
+
+        /**
+         * Checks whether or not a given TemplateLiteral node is actually using any of the special features provided by template literal strings.
+         * @param {ASTNode} node A TemplateLiteral node to check.
+         * @returns {boolean} Whether or not the TemplateLiteral node is using any of the special features provided by template literal strings.
+         * @private
+         */
+        function isUsingFeatureOfTemplateLiteral(node) {
+            const hasTag = node.parent.type === "TaggedTemplateExpression" && node === node.parent.quasi;
+
+            if (hasTag) {
+                return true;
+            }
+
+            const hasStringInterpolation = node.expressions.length > 0;
+
+            if (hasStringInterpolation) {
+                return true;
+            }
+
+            const isMultilineString = node.quasis.length >= 1 && UNESCAPED_LINEBREAK_PATTERN.test(node.quasis[0].value.raw);
+
+            if (isMultilineString) {
+                return true;
+            }
+
+            return false;
+        }
+
+        return {
+
+            Literal(node) {
+                const val = node.value,
+                    rawVal = node.raw;
+
+                if (settings && typeof val === "string") {
+                    let isValid = (quoteOption === "backtick" && isAllowedAsNonBacktick(node)) ||
+                        isJSXLiteral(node) ||
+                        astUtils.isSurroundedBy(rawVal, settings.quote);
+
+                    if (!isValid && avoidEscape) {
+                        isValid = astUtils.isSurroundedBy(rawVal, settings.alternateQuote) && rawVal.indexOf(settings.quote) >= 0;
+                    }
+
+                    if (!isValid) {
+                        context.report({
+                            node,
+                            messageId: "wrongQuotes",
+                            data: {
+                                description: settings.description
+                            },
+                            fix(fixer) {
+                                if (quoteOption === "backtick" && astUtils.hasOctalOrNonOctalDecimalEscapeSequence(rawVal)) {
+
+                                    /*
+                                     * An octal or non-octal decimal escape sequence in a template literal would
+                                     * produce syntax error, even in non-strict mode.
+                                     */
+                                    return null;
+                                }
+
+                                return fixer.replaceText(node, settings.convert(node.raw));
+                            }
+                        });
+                    }
+                }
+            },
+
+            TemplateLiteral(node) {
+
+                // Don't throw an error if backticks are expected or a template literal feature is in use.
+                if (
+                    allowTemplateLiterals ||
+                    quoteOption === "backtick" ||
+                    isUsingFeatureOfTemplateLiteral(node)
+                ) {
+                    return;
+                }
+
+                context.report({
+                    node,
+                    messageId: "wrongQuotes",
+                    data: {
+                        description: settings.description
+                    },
+                    fix(fixer) {
+                        if (isPartOfDirectivePrologue(node)) {
+
+                            /*
+                             * TemplateLiterals in a directive prologue aren't actually directives, but if they're
+                             * in the directive prologue, then fixing them might turn them into directives and change
+                             * the behavior of the code.
+                             */
+                            return null;
+                        }
+                        return fixer.replaceText(node, settings.convert(sourceCode.getText(node)));
+                    }
+                });
+            }
+        };
+
+    }
+};