| // Copyright (C) 2026 The Android Open Source Project |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| // Regex helpers for flamegraph filters. Frame names routinely contain regex |
| // metacharacters (`byte[]`, `operator()`, `MyClass$Nested`), so filters match |
| // literally by default and opt into regex with `/…/`. |
| |
| // Escapes all regex metacharacters so the result matches |str| literally |
| // when embedded in a regular expression. |
| export function escapeRegex(str: string): string { |
| return str.replace(/[.*+?^${}()|[\]\\]/g, '\\$&'); |
| } |
| |
| // Interprets a user-typed filter as a REGEXP pattern. |
| // |
| // Bare text matches literally: every metacharacter is escaped, so a pasted |
| // symbol like `MyClass$Nested` or `byte[]` matches as-is. Wrapping the text in |
| // `/…/` opts into a raw regex, e.g. `/alloc.*/`. |
| export function userFilterToRegex(filter: string): string { |
| if (filter.length >= 2 && filter.startsWith('/') && filter.endsWith('/')) { |
| return filter.slice(1, -1); |
| } |
| return escapeRegex(filter); |
| } |
