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app_vue/node_modules/eslint/lib/rules/no-misleading-character-class.js

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+/**
+ * @author Toru Nagashima <https://github.com/mysticatea>
+ */
+"use strict";
+
+const { CALL, CONSTRUCT, ReferenceTracker, getStringIfConstant } = require("eslint-utils");
+const { RegExpParser, visitRegExpAST } = require("regexpp");
+const { isCombiningCharacter, isEmojiModifier, isRegionalIndicatorSymbol, isSurrogatePair } = require("./utils/unicode");
+
+//------------------------------------------------------------------------------
+// Helpers
+//------------------------------------------------------------------------------
+
+/**
+ * Iterate character sequences of a given nodes.
+ *
+ * CharacterClassRange syntax can steal a part of character sequence,
+ * so this function reverts CharacterClassRange syntax and restore the sequence.
+ * @param {regexpp.AST.CharacterClassElement[]} nodes The node list to iterate character sequences.
+ * @returns {IterableIterator<number[]>} The list of character sequences.
+ */
+function *iterateCharacterSequence(nodes) {
+    let seq = [];
+
+    for (const node of nodes) {
+        switch (node.type) {
+            case "Character":
+                seq.push(node.value);
+                break;
+
+            case "CharacterClassRange":
+                seq.push(node.min.value);
+                yield seq;
+                seq = [node.max.value];
+                break;
+
+            case "CharacterSet":
+                if (seq.length > 0) {
+                    yield seq;
+                    seq = [];
+                }
+                break;
+
+            // no default
+        }
+    }
+
+    if (seq.length > 0) {
+        yield seq;
+    }
+}
+
+const hasCharacterSequence = {
+    surrogatePairWithoutUFlag(chars) {
+        return chars.some((c, i) => i !== 0 && isSurrogatePair(chars[i - 1], c));
+    },
+
+    combiningClass(chars) {
+        return chars.some((c, i) => (
+            i !== 0 &&
+            isCombiningCharacter(c) &&
+            !isCombiningCharacter(chars[i - 1])
+        ));
+    },
+
+    emojiModifier(chars) {
+        return chars.some((c, i) => (
+            i !== 0 &&
+            isEmojiModifier(c) &&
+            !isEmojiModifier(chars[i - 1])
+        ));
+    },
+
+    regionalIndicatorSymbol(chars) {
+        return chars.some((c, i) => (
+            i !== 0 &&
+            isRegionalIndicatorSymbol(c) &&
+            isRegionalIndicatorSymbol(chars[i - 1])
+        ));
+    },
+
+    zwj(chars) {
+        const lastIndex = chars.length - 1;
+
+        return chars.some((c, i) => (
+            i !== 0 &&
+            i !== lastIndex &&
+            c === 0x200d &&
+            chars[i - 1] !== 0x200d &&
+            chars[i + 1] !== 0x200d
+        ));
+    }
+};
+
+const kinds = Object.keys(hasCharacterSequence);
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+module.exports = {
+    meta: {
+        type: "problem",
+
+        docs: {
+            description: "disallow characters which are made with multiple code points in character class syntax",
+            category: "Possible Errors",
+            recommended: true,
+            url: "https://eslint.org/docs/rules/no-misleading-character-class"
+        },
+
+        schema: [],
+
+        messages: {
+            surrogatePairWithoutUFlag: "Unexpected surrogate pair in character class. Use 'u' flag.",
+            combiningClass: "Unexpected combined character in character class.",
+            emojiModifier: "Unexpected modified Emoji in character class.",
+            regionalIndicatorSymbol: "Unexpected national flag in character class.",
+            zwj: "Unexpected joined character sequence in character class."
+        }
+    },
+    create(context) {
+        const parser = new RegExpParser();
+
+        /**
+         * Verify a given regular expression.
+         * @param {Node} node The node to report.
+         * @param {string} pattern The regular expression pattern to verify.
+         * @param {string} flags The flags of the regular expression.
+         * @returns {void}
+         */
+        function verify(node, pattern, flags) {
+            const has = {
+                surrogatePairWithoutUFlag: false,
+                combiningClass: false,
+                variationSelector: false,
+                emojiModifier: false,
+                regionalIndicatorSymbol: false,
+                zwj: false
+            };
+            let patternNode;
+
+            try {
+                patternNode = parser.parsePattern(
+                    pattern,
+                    0,
+                    pattern.length,
+                    flags.includes("u")
+                );
+            } catch {
+
+                // Ignore regular expressions with syntax errors
+                return;
+            }
+
+            visitRegExpAST(patternNode, {
+                onCharacterClassEnter(ccNode) {
+                    for (const chars of iterateCharacterSequence(ccNode.elements)) {
+                        for (const kind of kinds) {
+                            has[kind] = has[kind] || hasCharacterSequence[kind](chars);
+                        }
+                    }
+                }
+            });
+
+            for (const kind of kinds) {
+                if (has[kind]) {
+                    context.report({ node, messageId: kind });
+                }
+            }
+        }
+
+        return {
+            "Literal[regex]"(node) {
+                verify(node, node.regex.pattern, node.regex.flags);
+            },
+            "Program"() {
+                const scope = context.getScope();
+                const tracker = new ReferenceTracker(scope);
+
+                /*
+                 * Iterate calls of RegExp.
+                 * E.g., `new RegExp()`, `RegExp()`, `new window.RegExp()`,
+                 *       `const {RegExp: a} = window; new a()`, etc...
+                 */
+                for (const { node } of tracker.iterateGlobalReferences({
+                    RegExp: { [CALL]: true, [CONSTRUCT]: true }
+                })) {
+                    const [patternNode, flagsNode] = node.arguments;
+                    const pattern = getStringIfConstant(patternNode, scope);
+                    const flags = getStringIfConstant(flagsNode, scope);
+
+                    if (typeof pattern === "string") {
+                        verify(node, pattern, flags || "");
+                    }
+                }
+            }
+        };
+    }
+};