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node_modules/stylelint/lib/rules/string-quotes/README.md

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+# string-quotes
+
+Specify single or double quotes around strings.
+
+<!-- prettier-ignore -->
+```css
+a[id="foo"] { content: "x"; }
+/**  ↑   ↑             ↑ ↑
+ * These quotes and these quotes */
+```
+
+Quotes within comments are ignored.
+
+<!-- prettier-ignore -->
+```css
+/* "This is fine" */
+/* 'And this is also fine' */
+```
+
+Single quotes in a charset @-rule are ignored as using single quotes in this context is incorrect according the [CSS specification](https://www.w3.org/TR/CSS2/syndata.html#x57).
+
+<!-- prettier-ignore -->
+```css
+@charset "utf-8"
+/* fine regardless of configuration */
+```
+
+The [`fix` option](../../../docs/user-guide/usage/options.md#fix) can automatically fix most of the problems reported by this rule.
+
+## Options
+
+`string`: `"single"|"double"`
+
+### `"single"`
+
+Strings _must always_ be wrapped with single quotes.
+
+The following patterns are considered violations:
+
+<!-- prettier-ignore -->
+```css
+a { content: "x"; }
+```
+
+<!-- prettier-ignore -->
+```css
+a[id="foo"] {}
+```
+
+The following patterns are _not_ considered violations:
+
+<!-- prettier-ignore -->
+```css
+a { content: 'x'; }
+```
+
+<!-- prettier-ignore -->
+```css
+a[id='foo'] {}
+```
+
+<!-- prettier-ignore -->
+```css
+a { content: "x'y'z"; }
+```
+
+### `"double"`
+
+Strings _must always_ be wrapped with double quotes.
+
+The following patterns are considered violations:
+
+<!-- prettier-ignore -->
+```css
+a { content: 'x'; }
+```
+
+<!-- prettier-ignore -->
+```css
+a[id='foo'] {}
+```
+
+The following patterns are _not_ considered violations:
+
+<!-- prettier-ignore -->
+```css
+a { content: "x"; }
+```
+
+<!-- prettier-ignore -->
+```css
+a[id="foo"] {}
+```
+
+<!-- prettier-ignore -->
+```css
+a { content: 'x"y"z'; }
+```
+
+## Optional secondary options
+
+### `avoidEscape`: `true|false`, defaults to `true`
+
+Allows strings to use single-quotes or double-quotes so long as the string contains a quote that would have to be escaped otherwise.
+
+For example, with `"single", { "avoidEscape" : false }`.
+
+The following patterns are considered violations:
+
+<!-- prettier-ignore -->
+```css
+a { content: "x'y'z"; }
+```
+
+<!-- prettier-ignore -->
+```css
+a[id="foo'bar'baz"] {}
+```
+
+The following patterns are _not_ considered violations:
+
+<!-- prettier-ignore -->
+```css
+a { content: 'x'; }
+```
+
+<!-- prettier-ignore -->
+```css
+a[id='foo'] {}
+```

node_modules/stylelint/lib/rules/string-quotes/index.js

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+// @ts-nocheck
+
+'use strict';
+
+const _ = require('lodash');
+const atRuleParamIndex = require('../../utils/atRuleParamIndex');
+const declarationValueIndex = require('../../utils/declarationValueIndex');
+const isStandardSyntaxRule = require('../../utils/isStandardSyntaxRule');
+const parseSelector = require('../../utils/parseSelector');
+const report = require('../../utils/report');
+const ruleMessages = require('../../utils/ruleMessages');
+const validateOptions = require('../../utils/validateOptions');
+const valueParser = require('postcss-value-parser');
+
+const ruleName = 'string-quotes';
+
+const messages = ruleMessages(ruleName, {
+	expected: (q) => `Expected ${q} quotes`,
+});
+
+const singleQuote = `'`;
+const doubleQuote = `"`;
+
+function rule(expectation, secondary, context) {
+	const correctQuote = expectation === 'single' ? singleQuote : doubleQuote;
+	const erroneousQuote = expectation === 'single' ? doubleQuote : singleQuote;
+
+	return (root, result) => {
+		const validOptions = validateOptions(
+			result,
+			ruleName,
+			{
+				actual: expectation,
+				possible: ['single', 'double'],
+			},
+			{
+				actual: secondary,
+				possible: {
+					avoidEscape: _.isBoolean,
+				},
+				optional: true,
+			},
+		);
+
+		if (!validOptions) {
+			return;
+		}
+
+		const avoidEscape = _.get(secondary, 'avoidEscape', true);
+
+		root.walk((node) => {
+			switch (node.type) {
+				case 'atrule':
+					checkDeclOrAtRule(node, node.params, atRuleParamIndex);
+					break;
+				case 'decl':
+					checkDeclOrAtRule(node, node.value, declarationValueIndex);
+					break;
+				case 'rule':
+					checkRule(node);
+					break;
+			}
+		});
+
+		function checkRule(ruleNode) {
+			if (!isStandardSyntaxRule(ruleNode)) {
+				return;
+			}
+
+			if (!ruleNode.selector.includes('[') || !ruleNode.selector.includes('=')) {
+				return;
+			}
+
+			const fixPositions = [];
+
+			parseSelector(ruleNode.selector, result, ruleNode, (selectorTree) => {
+				let selectorFixed = false;
+
+				selectorTree.walkAttributes((attributeNode) => {
+					if (!attributeNode.quoted) {
+						return;
+					}
+
+					if (attributeNode.quoteMark === correctQuote) {
+						if (avoidEscape) {
+							const needsCorrectEscape = attributeNode.value.includes(correctQuote);
+							const needsOtherEscape = attributeNode.value.includes(erroneousQuote);
+
+							if (needsOtherEscape) {
+								return;
+							}
+
+							if (needsCorrectEscape) {
+								if (context.fix) {
+									selectorFixed = true;
+									attributeNode.quoteMark = erroneousQuote;
+								} else {
+									report({
+										message: messages.expected(expectation === 'single' ? 'double' : expectation),
+										node: ruleNode,
+										index: attributeNode.sourceIndex + attributeNode.offsetOf('value'),
+										result,
+										ruleName,
+									});
+								}
+							}
+						}
+					}
+
+					if (attributeNode.quoteMark === erroneousQuote) {
+						if (avoidEscape) {
+							const needsCorrectEscape = attributeNode.value.includes(correctQuote);
+							const needsOtherEscape = attributeNode.value.includes(erroneousQuote);
+
+							if (needsOtherEscape) {
+								if (context.fix) {
+									selectorFixed = true;
+									attributeNode.quoteMark = correctQuote;
+								} else {
+									report({
+										message: messages.expected(expectation),
+										node: ruleNode,
+										index: attributeNode.sourceIndex + attributeNode.offsetOf('value'),
+										result,
+										ruleName,
+									});
+								}
+
+								return;
+							}
+
+							if (needsCorrectEscape) {
+								return;
+							}
+						}
+
+						if (context.fix) {
+							selectorFixed = true;
+							attributeNode.quoteMark = correctQuote;
+						} else {
+							report({
+								message: messages.expected(expectation),
+								node: ruleNode,
+								index: attributeNode.sourceIndex + attributeNode.offsetOf('value'),
+								result,
+								ruleName,
+							});
+						}
+					}
+				});
+
+				if (selectorFixed) {
+					ruleNode.selector = selectorTree.toString();
+				}
+			});
+
+			fixPositions.forEach((fixIndex) => {
+				ruleNode.selector = replaceQuote(ruleNode.selector, fixIndex, correctQuote);
+			});
+		}
+
+		function checkDeclOrAtRule(node, value, getIndex) {
+			const fixPositions = [];
+
+			// Get out quickly if there are no erroneous quotes
+			if (!value.includes(erroneousQuote)) {
+				return;
+			}
+
+			if (node.type === 'atrule' && node.name === 'charset') {
+				// allow @charset rules to have double quotes, in spite of the configuration
+				// TODO: @charset should always use double-quotes, see https://github.com/stylelint/stylelint/issues/2788
+				return;
+			}
+
+			valueParser(value).walk((valueNode) => {
+				if (valueNode.type === 'string' && valueNode.quote === erroneousQuote) {
+					const needsEscape = valueNode.value.includes(correctQuote);
+
+					if (avoidEscape && needsEscape) {
+						// don't consider this an error
+						return;
+					}
+
+					const openIndex = valueNode.sourceIndex;
+
+					// we currently don't fix escapes
+					if (context.fix && !needsEscape) {
+						const closeIndex = openIndex + valueNode.value.length + erroneousQuote.length;
+
+						fixPositions.push(openIndex, closeIndex);
+					} else {
+						report({
+							message: messages.expected(expectation),
+							node,
+							index: getIndex(node) + openIndex,
+							result,
+							ruleName,
+						});
+					}
+				}
+			});
+
+			fixPositions.forEach((fixIndex) => {
+				if (node.type === 'atrule') {
+					node.params = replaceQuote(node.params, fixIndex, correctQuote);
+				} else {
+					node.value = replaceQuote(node.value, fixIndex, correctQuote);
+				}
+			});
+		}
+	};
+}
+
+function replaceQuote(string, index, replace) {
+	return string.substring(0, index) + replace + string.substring(index + replace.length);
+}
+
+rule.ruleName = ruleName;
+rule.messages = messages;
+module.exports = rule;