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Diffstat (limited to 'tools/node_modules/eslint/lib/rules/no-control-regex.js')
-rw-r--r-- | tools/node_modules/eslint/lib/rules/no-control-regex.js | 127 |
1 files changed, 127 insertions, 0 deletions
diff --git a/tools/node_modules/eslint/lib/rules/no-control-regex.js b/tools/node_modules/eslint/lib/rules/no-control-regex.js new file mode 100644 index 0000000000..14981f4ab1 --- /dev/null +++ b/tools/node_modules/eslint/lib/rules/no-control-regex.js @@ -0,0 +1,127 @@ +/** + * @fileoverview Rule to forbid control charactes from regular expressions. + * @author Nicholas C. Zakas + */ + +"use strict"; + +//------------------------------------------------------------------------------ +// Rule Definition +//------------------------------------------------------------------------------ + +module.exports = { + meta: { + docs: { + description: "disallow control characters in regular expressions", + category: "Possible Errors", + recommended: true + }, + + schema: [] + }, + + create(context) { + + /** + * Get the regex expression + * @param {ASTNode} node node to evaluate + * @returns {*} Regex if found else null + * @private + */ + function getRegExp(node) { + if (node.value instanceof RegExp) { + return node.value; + } + if (typeof node.value === "string") { + + const parent = context.getAncestors().pop(); + + if ((parent.type === "NewExpression" || parent.type === "CallExpression") && + parent.callee.type === "Identifier" && parent.callee.name === "RegExp" + ) { + + // there could be an invalid regular expression string + try { + return new RegExp(node.value); + } catch (ex) { + return null; + } + } + } + + return null; + } + + + const controlChar = /[\x00-\x1f]/g; // eslint-disable-line no-control-regex + const consecutiveSlashes = /\\+/g; + const consecutiveSlashesAtEnd = /\\+$/g; + const stringControlChar = /\\x[01][0-9a-f]/ig; + const stringControlCharWithoutSlash = /x[01][0-9a-f]/ig; + + /** + * Return a list of the control characters in the given regex string + * @param {string} regexStr regex as string to check + * @returns {array} returns a list of found control characters on given string + * @private + */ + function getControlCharacters(regexStr) { + + // check control characters, if RegExp object used + const controlChars = regexStr.match(controlChar) || []; + + let stringControlChars = []; + + // check substr, if regex literal used + const subStrIndex = regexStr.search(stringControlChar); + + if (subStrIndex > -1) { + + // is it escaped, check backslash count + const possibleEscapeCharacters = regexStr.slice(0, subStrIndex).match(consecutiveSlashesAtEnd); + + const hasControlChars = possibleEscapeCharacters === null || !(possibleEscapeCharacters[0].length % 2); + + if (hasControlChars) { + stringControlChars = regexStr.slice(subStrIndex, -1) + .split(consecutiveSlashes) + .filter(Boolean) + .map(x => { + const match = x.match(stringControlCharWithoutSlash) || [x]; + + return `\\${match[0]}`; + }); + } + } + + return controlChars.map(x => { + const hexCode = `0${x.charCodeAt(0).toString(16)}`.slice(-2); + + return `\\x${hexCode}`; + }).concat(stringControlChars); + } + + return { + Literal(node) { + const regex = getRegExp(node); + + if (regex) { + const computedValue = regex.toString(); + + const controlCharacters = getControlCharacters(computedValue); + + if (controlCharacters.length > 0) { + context.report({ + node, + message: "Unexpected control character(s) in regular expression: {{controlChars}}.", + data: { + controlChars: controlCharacters.join(", ") + } + }); + } + } + } + }; + + } +}; |