From 8635dab4c38fcd67962819224093d0be95f5ed43 Mon Sep 17 00:00:00 2001
From: Chris Loer <chris.loer@gmail.com>
Date: Thu, 8 Feb 2018 15:23:29 -0800
Subject: [core] Implement Expression::serialize() Issue #10714 - Each
 expression stores its operator as a string, and default serialization is
 [operator, serialize(child1), ...] - Custom implementations of `serialize`
 for Expression types that don't follow the pattern - expression::Value ->
 mbgl::Value converter - node_expression bindings to expose `serialize`

---
 src/mbgl/style/expression/step.cpp | 12 ++++++++++++
 1 file changed, 12 insertions(+)

(limited to 'src/mbgl/style/expression/step.cpp')

diff --git a/src/mbgl/style/expression/step.cpp b/src/mbgl/style/expression/step.cpp
index 34537d48ae..ddaf9417cb 100644
--- a/src/mbgl/style/expression/step.cpp
+++ b/src/mbgl/style/expression/step.cpp
@@ -168,6 +168,18 @@ ParseResult Step::parse(const mbgl::style::conversion::Convertible& value, Parsi
     return ParseResult(std::make_unique<Step>(*outputType, std::move(*input), std::move(stops)));
 }
 
+mbgl::Value Step::serialize() const {
+    std::vector<mbgl::Value> serialized;
+    serialized.emplace_back(getOperator());
+    serialized.emplace_back(input->serialize());
+    for (auto& entry : stops) {
+        if (entry.first > -std::numeric_limits<double>::infinity()) {
+            serialized.emplace_back(entry.first);
+        }
+        serialized.emplace_back(entry.second->serialize());
+    }
+    return serialized;
+}
 
 } // namespace expression
 } // namespace style
-- 
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