From 141e995806576364d185626176c1b993fc519291 Mon Sep 17 00:00:00 2001
From: John Firebaugh <john.firebaugh@gmail.com>
Date: Fri, 28 Oct 2016 16:39:50 -0700
Subject: [core] Add support for data-driven styling

---
 src/mbgl/style/function/categorical_stops.cpp | 35 ++++++++++++++++++++++
 src/mbgl/style/function/identity_stops.cpp    | 43 +++++++++++++++++++++++++++
 2 files changed, 78 insertions(+)
 create mode 100644 src/mbgl/style/function/categorical_stops.cpp
 create mode 100644 src/mbgl/style/function/identity_stops.cpp

(limited to 'src/mbgl/style/function')

diff --git a/src/mbgl/style/function/categorical_stops.cpp b/src/mbgl/style/function/categorical_stops.cpp
new file mode 100644
index 0000000000..bcdf170f17
--- /dev/null
+++ b/src/mbgl/style/function/categorical_stops.cpp
@@ -0,0 +1,35 @@
+#include <mbgl/style/function/categorical_stops.hpp>
+#include <mbgl/util/color.hpp>
+
+#include <array>
+
+namespace mbgl {
+namespace style {
+
+optional<CategoricalValue> categoricalValue(const Value& value) {
+    return value.match(
+        [] (bool t) { return optional<CategoricalValue>(t); },
+        [] (uint64_t t) { return optional<CategoricalValue>(int64_t(t)); },
+        [] (int64_t t) { return optional<CategoricalValue>(t); },
+        [] (double t) { return optional<CategoricalValue>(int64_t(t)); },
+        [] (const std::string& t) { return optional<CategoricalValue>(t); },
+        [] (const auto&) { return optional<CategoricalValue>(); }
+    );
+}
+
+template <class T>
+T CategoricalStops<T>::evaluate(const Value& value) const {
+    auto v = categoricalValue(value);
+    if (!v) {
+        return defaultValue;
+    }
+    auto it = stops.find(*v);
+    return it == stops.end() ? defaultValue : it->second;
+}
+
+template class CategoricalStops<float>;
+template class CategoricalStops<Color>;
+template class CategoricalStops<std::array<float, 2>>;
+
+} // namespace style
+} // namespace mbgl
diff --git a/src/mbgl/style/function/identity_stops.cpp b/src/mbgl/style/function/identity_stops.cpp
new file mode 100644
index 0000000000..e210b4d773
--- /dev/null
+++ b/src/mbgl/style/function/identity_stops.cpp
@@ -0,0 +1,43 @@
+#include <mbgl/style/function/identity_stops.hpp>
+#include <mbgl/util/color.hpp>
+
+#include <array>
+
+namespace mbgl {
+namespace style {
+
+template <>
+float IdentityStops<float>::evaluate(const Value& value) const {
+    return numericValue<float>(value)
+        .value_or(0.0f);
+}
+
+template <>
+Color IdentityStops<Color>::evaluate(const Value& value) const {
+    if (!value.is<std::string>()) {
+        return Color::black();
+    }
+
+    return Color::parse(value.get<std::string>())
+        .value_or(Color::black());
+}
+
+template <>
+std::array<float, 2> IdentityStops<std::array<float, 2>>::evaluate(const Value& value) const {
+    if (!value.is<std::vector<Value>>()) {
+        return {{ 0, 0 }};
+    }
+
+    const std::vector<Value>& vector = value.get<std::vector<Value>>();
+    if (vector.size() != 2 || !numericValue<float>(vector[0]) || !numericValue<float>(vector[1])) {
+        return {{ 0, 0 }};
+    }
+
+    return {{
+        *numericValue<float>(vector[0]),
+        *numericValue<float>(vector[1])
+    }};
+}
+
+} // namespace style
+} // namespace mbgl
-- 
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