json: Allow to buffer writings.

Signed-off-by: Jean-Christophe Beaupré <jcbrinfo@users.noreply.github.com>

diff --git a/lib/json/static.nit b/lib/json/static.nit
index 55b5a1e..29e5c22 100644 (file)
--- a/lib/json/static.nit
+++ b/lib/json/static.nit
@@ -30,18 +30,22 @@ private import json_lexer
 # Something that can be translated to JSON.
 interface Jsonable
        # Encode `self` in JSON.
+       #
+       # SEE: `append_json`
        fun to_json: String is abstract
+
+       # Append the JSON representation of `self` to the specified buffer.
+       #
+       # SEE: `to_json`
+       fun append_json(buffer: Buffer) do
+               buffer.append(to_json)
+       end
 end
 
 redef class Text
        super Jsonable
 
-       # Encode `self` in JSON.
-       #
-       #     assert "\t\"http://example.com\"\r\n\0\\".to_json ==
-       #               "\"\\t\\\"http:\\/\\/example.com\\\"\\r\\n\\u0000\\\\\""
-       redef fun to_json do
-               var buffer = new FlatBuffer
+       redef fun append_json(buffer) do
                buffer.add '\"'
                for i in [0..self.length[ do
                        var char = self[i]
@@ -72,6 +76,15 @@ redef class Text
                        end
                end
                buffer.add '\"'
+       end
+
+       # Encode `self` in JSON.
+       #
+       #     assert "\t\"http://example.com\"\r\n\0\\".to_json ==
+       #               "\"\\t\\\"http:\\/\\/example.com\\\"\\r\\n\\u0000\\\\\""
+       redef fun to_json do
+               var buffer = new FlatBuffer
+               append_json(buffer)
                return buffer.write_to_string
        end
 
@@ -176,16 +189,7 @@ interface JsonMapRead[K: String, V: nullable Jsonable]
        super MapRead[K, V]
        super Jsonable
 
-       # Encode `self` in JSON.
-       #
-       #     var obj = new JsonObject
-       #     obj["foo"] = "bar"
-       #     assert obj.to_json == "\{\"foo\":\"bar\"\}"
-       #     obj = new JsonObject
-       #     obj["baz"] = null
-       #     assert obj.to_json == "\{\"baz\":null\}"
-       redef fun to_json do
-               var buffer = new FlatBuffer
+       redef fun append_json(buffer) do
                buffer.append "\{"
                var it = iterator
                if it.is_ok then
@@ -197,6 +201,19 @@ interface JsonMapRead[K: String, V: nullable Jsonable]
                end
                it.finish
                buffer.append "\}"
+       end
+
+       # Encode `self` in JSON.
+       #
+       #     var obj = new JsonObject
+       #     obj["foo"] = "bar"
+       #     assert obj.to_json == "\{\"foo\":\"bar\"\}"
+       #     obj = new JsonObject
+       #     obj["baz"] = null
+       #     assert obj.to_json == "\{\"baz\":null\}"
+       redef fun to_json do
+               var buffer = new FlatBuffer
+               append_json(buffer)
                return buffer.write_to_string
        end
 
@@ -220,16 +237,7 @@ class JsonSequenceRead[E: nullable Jsonable]
        super Jsonable
        super SequenceRead[E]
 
-       # Encode `self` in JSON.
-       #
-       #     var arr = new JsonArray.with_items("foo", null)
-       #     assert arr.to_json == "[\"foo\",null]"
-       #     arr.pop
-       #     assert arr.to_json =="[\"foo\"]"
-       #     arr.pop
-       #     assert arr.to_json =="[]"
-       redef fun to_json do
-               var buffer = new FlatBuffer
+       redef fun append_json(buffer) do
                buffer.append "["
                var it = iterator
                if it.is_ok then
@@ -241,6 +249,19 @@ class JsonSequenceRead[E: nullable Jsonable]
                end
                it.finish
                buffer.append "]"
+       end
+
+       # Encode `self` in JSON.
+       #
+       #     var arr = new JsonArray.with_items("foo", null)
+       #     assert arr.to_json == "[\"foo\",null]"
+       #     arr.pop
+       #     assert arr.to_json =="[\"foo\"]"
+       #     arr.pop
+       #     assert arr.to_json =="[]"
+       redef fun to_json do
+               var buffer = new FlatBuffer
+               append_json(buffer)
                return buffer.write_to_string
        end