From efc50fe5714e0bc42f257eaaa8680163c11a4649 Mon Sep 17 00:00:00 2001
From: Daniel Jones <daniel@jones.org.uk>
Date: Tue, 9 Jan 2024 21:13:33 +0000
Subject: [PATCH] PatchSpec: Round json output to 8 decimal places

---
 source/lib/json11/json11.cpp |  3 ++-
 tests/test_patch.py          | 15 ++++++++++++++-
 2 files changed, 16 insertions(+), 2 deletions(-)

diff --git a/source/lib/json11/json11.cpp b/source/lib/json11/json11.cpp
index 3e5af5d4..456822c2 100644
--- a/source/lib/json11/json11.cpp
+++ b/source/lib/json11/json11.cpp
@@ -62,7 +62,8 @@ static void dump(double value, string &out)
     if (std::isfinite(value))
     {
         char buf[32];
-        snprintf(buf, sizeof buf, "%.17g", value);
+        // DJJ: Modified to round doubles to 8 d.p. precision.
+        snprintf(buf, sizeof buf, "%.8g", value);
         out += buf;
     }
     else
diff --git a/tests/test_patch.py b/tests/test_patch.py
index d2b4e948..29511e7a 100644
--- a/tests/test_patch.py
+++ b/tests/test_patch.py
@@ -1,5 +1,5 @@
 from signalflow import PatchSpec, Patch, Buffer, BufferPlayer
-from signalflow import Multiply, SineOscillator, ASREnvelope, SquareOscillator, Sum, Add, AzimuthPanner
+from signalflow import Multiply, SineOscillator, ASREnvelope, SquareOscillator, Sum, Add, AzimuthPanner, StereoPanner
 from . import graph
 import numpy as np
 import json
@@ -89,3 +89,16 @@ def test_patch_property_serialisation_json(graph):
     spec_new.from_json(spec_json)
     patch = Patch(spec_new)
     assert patch.output.num_output_channels == 3
+
+def test_patch_to_json(graph):
+    class TestPatch (Patch):
+        def __init__(self):
+            super().__init__()
+            sin = SineOscillator(440) * ASREnvelope()
+            stereo = StereoPanner(sin)
+            self.set_output(stereo)
+
+    patch = TestPatch()
+    spec = patch.to_spec()
+    json = spec.to_json()
+    assert json == '{"buffer_inputs": [], "inputs": [], "name": "", "nodes": [{"id": 4, "inputs": {"attack": 0.1, "curve": 1, "release": 0.1, "sustain": 0.5}, "node": "asr-envelope"}, {"id": 2, "inputs": {"frequency": 440}, "node": "sine"}, {"id": 1, "inputs": {"input0": {"id": 2}, "input1": {"id": 4}}, "node": "multiply"}, {"id": 0, "inputs": {"input": {"id": 1}, "pan": 0}, "is_output": true, "node": "stereo-panner"}]}'
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