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+/**
+ * @fileoverview Rule to flag non-quoted property names in object literals.
+ * @author Mathias Bynens <http://mathiasbynens.be/>
+ */
+"use strict";
+
+//------------------------------------------------------------------------------
+// Requirements
+//------------------------------------------------------------------------------
+
+const espree = require("espree"),
+ keywords = require("../util/keywords");
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+module.exports = {
+ meta: {
+ docs: {
+ description: "require quotes around object literal property names",
+ category: "Stylistic Issues",
+ recommended: false
+ },
+
+ schema: {
+ anyOf: [
+ {
+ type: "array",
+ items: [
+ {
+ enum: ["always", "as-needed", "consistent", "consistent-as-needed"]
+ }
+ ],
+ minItems: 0,
+ maxItems: 1
+ },
+ {
+ type: "array",
+ items: [
+ {
+ enum: ["always", "as-needed", "consistent", "consistent-as-needed"]
+ },
+ {
+ type: "object",
+ properties: {
+ keywords: {
+ type: "boolean"
+ },
+ unnecessary: {
+ type: "boolean"
+ },
+ numbers: {
+ type: "boolean"
+ }
+ },
+ additionalProperties: false
+ }
+ ],
+ minItems: 0,
+ maxItems: 2
+ }
+ ]
+ },
+
+ fixable: "code"
+ },
+
+ create(context) {
+
+ const MODE = context.options[0],
+ KEYWORDS = context.options[1] && context.options[1].keywords,
+ CHECK_UNNECESSARY = !context.options[1] || context.options[1].unnecessary !== false,
+ NUMBERS = context.options[1] && context.options[1].numbers,
+
+ MESSAGE_UNNECESSARY = "Unnecessarily quoted property '{{property}}' found.",
+ MESSAGE_UNQUOTED = "Unquoted property '{{property}}' found.",
+ MESSAGE_NUMERIC = "Unquoted number literal '{{property}}' used as key.",
+ MESSAGE_RESERVED = "Unquoted reserved word '{{property}}' used as key.",
+ sourceCode = context.getSourceCode();
+
+
+ /**
+ * Checks whether a certain string constitutes an ES3 token
+ * @param {string} tokenStr - The string to be checked.
+ * @returns {boolean} `true` if it is an ES3 token.
+ */
+ function isKeyword(tokenStr) {
+ return keywords.indexOf(tokenStr) >= 0;
+ }
+
+ /**
+ * Checks if an espree-tokenized key has redundant quotes (i.e. whether quotes are unnecessary)
+ * @param {string} rawKey The raw key value from the source
+ * @param {espreeTokens} tokens The espree-tokenized node key
+ * @param {boolean} [skipNumberLiterals=false] Indicates whether number literals should be checked
+ * @returns {boolean} Whether or not a key has redundant quotes.
+ * @private
+ */
+ function areQuotesRedundant(rawKey, tokens, skipNumberLiterals) {
+ return tokens.length === 1 && tokens[0].start === 0 && tokens[0].end === rawKey.length &&
+ (["Identifier", "Keyword", "Null", "Boolean"].indexOf(tokens[0].type) >= 0 ||
+ (tokens[0].type === "Numeric" && !skipNumberLiterals && String(+tokens[0].value) === tokens[0].value));
+ }
+
+ /**
+ * Returns a string representation of a property node with quotes removed
+ * @param {ASTNode} key Key AST Node, which may or may not be quoted
+ * @returns {string} A replacement string for this property
+ */
+ function getUnquotedKey(key) {
+ return key.type === "Identifier" ? key.name : key.value;
+ }
+
+ /**
+ * Returns a string representation of a property node with quotes added
+ * @param {ASTNode} key Key AST Node, which may or may not be quoted
+ * @returns {string} A replacement string for this property
+ */
+ function getQuotedKey(key) {
+ if (key.type === "Literal" && typeof key.value === "string") {
+
+ // If the key is already a string literal, don't replace the quotes with double quotes.
+ return sourceCode.getText(key);
+ }
+
+ // Otherwise, the key is either an identifier or a number literal.
+ return `"${key.type === "Identifier" ? key.name : key.value}"`;
+ }
+
+ /**
+ * Ensures that a property's key is quoted only when necessary
+ * @param {ASTNode} node Property AST node
+ * @returns {void}
+ */
+ function checkUnnecessaryQuotes(node) {
+ const key = node.key;
+
+ if (node.method || node.computed || node.shorthand) {
+ return;
+ }
+
+ if (key.type === "Literal" && typeof key.value === "string") {
+ let tokens;
+
+ try {
+ tokens = espree.tokenize(key.value);
+ } catch (e) {
+ return;
+ }
+
+ if (tokens.length !== 1) {
+ return;
+ }
+
+ const isKeywordToken = isKeyword(tokens[0].value);
+
+ if (isKeywordToken && KEYWORDS) {
+ return;
+ }
+
+ if (CHECK_UNNECESSARY && areQuotesRedundant(key.value, tokens, NUMBERS)) {
+ context.report({
+ node,
+ message: MESSAGE_UNNECESSARY,
+ data: { property: key.value },
+ fix: fixer => fixer.replaceText(key, getUnquotedKey(key))
+ });
+ }
+ } else if (KEYWORDS && key.type === "Identifier" && isKeyword(key.name)) {
+ context.report({
+ node,
+ message: MESSAGE_RESERVED,
+ data: { property: key.name },
+ fix: fixer => fixer.replaceText(key, getQuotedKey(key))
+ });
+ } else if (NUMBERS && key.type === "Literal" && typeof key.value === "number") {
+ context.report({
+ node,
+ message: MESSAGE_NUMERIC,
+ data: { property: key.value },
+ fix: fixer => fixer.replaceText(key, getQuotedKey(key))
+ });
+ }
+ }
+
+ /**
+ * Ensures that a property's key is quoted
+ * @param {ASTNode} node Property AST node
+ * @returns {void}
+ */
+ function checkOmittedQuotes(node) {
+ const key = node.key;
+
+ if (!node.method && !node.computed && !node.shorthand && !(key.type === "Literal" && typeof key.value === "string")) {
+ context.report({
+ node,
+ message: MESSAGE_UNQUOTED,
+ data: { property: key.name || key.value },
+ fix: fixer => fixer.replaceText(key, getQuotedKey(key))
+ });
+ }
+ }
+
+ /**
+ * Ensures that an object's keys are consistently quoted, optionally checks for redundancy of quotes
+ * @param {ASTNode} node Property AST node
+ * @param {boolean} checkQuotesRedundancy Whether to check quotes' redundancy
+ * @returns {void}
+ */
+ function checkConsistency(node, checkQuotesRedundancy) {
+ const quotedProps = [],
+ unquotedProps = [];
+ let keywordKeyName = null,
+ necessaryQuotes = false;
+
+ node.properties.forEach(property => {
+ const key = property.key;
+
+ if (!key || property.method || property.computed || property.shorthand) {
+ return;
+ }
+
+ if (key.type === "Literal" && typeof key.value === "string") {
+
+ quotedProps.push(property);
+
+ if (checkQuotesRedundancy) {
+ let tokens;
+
+ try {
+ tokens = espree.tokenize(key.value);
+ } catch (e) {
+ necessaryQuotes = true;
+ return;
+ }
+
+ necessaryQuotes = necessaryQuotes || !areQuotesRedundant(key.value, tokens) || KEYWORDS && isKeyword(tokens[0].value);
+ }
+ } else if (KEYWORDS && checkQuotesRedundancy && key.type === "Identifier" && isKeyword(key.name)) {
+ unquotedProps.push(property);
+ necessaryQuotes = true;
+ keywordKeyName = key.name;
+ } else {
+ unquotedProps.push(property);
+ }
+ });
+
+ if (checkQuotesRedundancy && quotedProps.length && !necessaryQuotes) {
+ quotedProps.forEach(property => {
+ context.report({
+ node: property,
+ message: "Properties shouldn't be quoted as all quotes are redundant.",
+ fix: fixer => fixer.replaceText(property.key, getUnquotedKey(property.key))
+ });
+ });
+ } else if (unquotedProps.length && keywordKeyName) {
+ unquotedProps.forEach(property => {
+ context.report({
+ node: property,
+ message: "Properties should be quoted as '{{property}}' is a reserved word.",
+ data: { property: keywordKeyName },
+ fix: fixer => fixer.replaceText(property.key, getQuotedKey(property.key))
+ });
+ });
+ } else if (quotedProps.length && unquotedProps.length) {
+ unquotedProps.forEach(property => {
+ context.report({
+ node: property,
+ message: "Inconsistently quoted property '{{key}}' found.",
+ data: { key: property.key.name || property.key.value },
+ fix: fixer => fixer.replaceText(property.key, getQuotedKey(property.key))
+ });
+ });
+ }
+ }
+
+ return {
+ Property(node) {
+ if (MODE === "always" || !MODE) {
+ checkOmittedQuotes(node);
+ }
+ if (MODE === "as-needed") {
+ checkUnnecessaryQuotes(node);
+ }
+ },
+ ObjectExpression(node) {
+ if (MODE === "consistent") {
+ checkConsistency(node, false);
+ }
+ if (MODE === "consistent-as-needed") {
+ checkConsistency(node, true);
+ }
+ }
+ };
+
+ }
+};
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