| // Copyright 2026 The Go Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style |
| // license that can be found in the LICENSE file. |
| |
| // Package writestring defines an Analyzer that detects |
| // inefficient string concatenation in uses of WriteString. |
| // |
| // # Analyzer writestring |
| // |
| // writestring: detect inefficient string concatenation in uses of WriteString |
| // |
| // The writestring analyzer offers to replace a call to WriteString(x + y) by |
| // two calls WriteString(x); WriteString(y). This is more efficient because it |
| // avoids the additional memory allocation produced by string concatenation; |
| // instead we just write each string into the buffer directly. |
| // |
| // It explicitly looks for calls to certain well-known writers such as |
| // bytes.Buffer, strings.Builder and bufio.Writer. The analyzer will not suggest |
| // a fix for calls to, say, (*os.File).WriteString, because for certain kinds of |
| // file such as a UDP socket, it could split a single message into two. |
| // Similarly it does not offer fixes when the type of the writer is unknown (as |
| // in calls to io.WriteString). |
| // |
| // For example: |
| // |
| // func f(a string, b string) string { |
| // var s strings.Builder |
| // s.WriteString(a+b) |
| // return s.String() |
| // } |
| // |
| // would become: |
| // |
| // func f(a string, b string) string { |
| // var s strings.Builder |
| // s.WriteString(a) |
| // s.WriteString(b) |
| // return s.String() |
| // } |
| package writestring |
