实现基础web服务器

vendor/github.com/bytedance/sonic/internal/encoder/stream.go

@@ -0,0 +1,84 @@
+/*
+ * Copyright 2021 ByteDance Inc.
+ *
+ * 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.
+ */
+
+package encoder
+
+import (
+    `encoding/json`
+    `io`
+)
+
+// StreamEncoder uses io.Writer as input.
+type StreamEncoder struct {
+    w io.Writer
+    Encoder
+}
+
+// NewStreamEncoder adapts to encoding/json.NewDecoder API.
+//
+// NewStreamEncoder returns a new encoder that write to w.
+func NewStreamEncoder(w io.Writer) *StreamEncoder {
+    return &StreamEncoder{w: w}
+}
+
+// Encode encodes interface{} as JSON to io.Writer
+func (enc *StreamEncoder) Encode(val interface{}) (err error) {
+    out := newBytes()
+
+    /* encode into the buffer */
+    err = EncodeInto(&out, val, enc.Opts)
+    if err != nil {
+        goto free_bytes
+    }
+
+    if enc.indent != "" || enc.prefix != "" {
+        /* indent the JSON */
+        buf := newBuffer()
+        err = json.Indent(buf, out, enc.prefix, enc.indent)
+        if err != nil {
+            freeBuffer(buf)
+            goto free_bytes
+        }
+
+        // according to standard library, terminate each value with a newline...
+        buf.WriteByte('\n')
+
+        /* copy into io.Writer */
+        _, err = io.Copy(enc.w, buf)
+        if err != nil {
+            freeBuffer(buf)
+            goto free_bytes
+        }
+
+    } else {
+        /* copy into io.Writer */
+        var n int
+        for len(out) > 0 {
+            n, err = enc.w.Write(out)
+            out = out[n:]
+            if err != nil {
+                goto free_bytes
+            }
+        }
+
+        // according to standard library, terminate each value with a newline...
+        enc.w.Write([]byte{'\n'})
+    }
+
+free_bytes:
+    freeBytes(out)
+    return err
+}