Implement readString (denoland/deno_std#607)

Original: https://github.com/denoland/deno_std/commit/20b6408e105f5dd1dbcd0a252d1956b3de1024ca

1 files changed, 5 insertions, 2 deletions

diff --git a/io/bufio.ts b/io/bufio.ts
index 9a7bf1dc1..c158e5051 100644
--- a/io/bufio.ts
+++ b/io/bufio.ts
@@ -211,8 +211,11 @@ export class BufReader implements Reader {
    * delim.
    * For simple uses, a Scanner may be more convenient.
    */
-  async readString(_delim: string): Promise<string | Deno.EOF> {
-    throw new Error("Not implemented");
+  async readString(delim: string): Promise<string | Deno.EOF> {
+    if (delim.length !== 1)
+      throw new Error("Delimiter should be a single character");
+    const buffer = await this.readSlice(delim.charCodeAt(0));
+    return new TextDecoder().decode(buffer || undefined);
   }
 
   /** `readLine()` is a low-level line-reading primitive. Most callers should