From 6f6e577acff72caa2f540ccfe4844578f4b00a2e Mon Sep 17 00:00:00 2001
From: kevin <kevin.li@mapbox.com>
Date: Tue, 11 Feb 2020 19:34:58 +0800
Subject: Add expression_equality test for 'in'

---
 include/mbgl/style/expression/in.hpp        |  3 +--
 src/mbgl/style/expression/in.cpp            | 41 +++++++++++++----------------
 test/fixtures/expression_equality/in.a.json | 20 ++++++++++++++
 test/fixtures/expression_equality/in.b.json | 20 ++++++++++++++
 4 files changed, 59 insertions(+), 25 deletions(-)
 create mode 100644 test/fixtures/expression_equality/in.a.json
 create mode 100644 test/fixtures/expression_equality/in.b.json

diff --git a/include/mbgl/style/expression/in.hpp b/include/mbgl/style/expression/in.hpp
index 6bd57e2833..f3e7551914 100644
--- a/include/mbgl/style/expression/in.hpp
+++ b/include/mbgl/style/expression/in.hpp
@@ -10,8 +10,7 @@ namespace expression {
 
 class In final : public Expression {
 public:
-    In(std::unique_ptr<Expression> needle_, std::unique_ptr<Expression> haystack_)
-        : Expression(Kind::In, type::Boolean), needle(std::move(needle_)), haystack(std::move(haystack_)) {}
+    In(std::unique_ptr<Expression> needle_, std::unique_ptr<Expression> haystack_);
 
     static ParseResult parse(const mbgl::style::conversion::Convertible& value, ParsingContext& ctx);
 
diff --git a/src/mbgl/style/expression/in.cpp b/src/mbgl/style/expression/in.cpp
index 28658b4a31..e0cdc9f260 100644
--- a/src/mbgl/style/expression/in.cpp
+++ b/src/mbgl/style/expression/in.cpp
@@ -11,37 +11,43 @@ namespace expression {
 namespace {
 bool isComparableType(type::Type type) {
     return type == type::Boolean || type == type::String || type == type::Number || type == type::Null ||
-        type == type::Value;
+           type == type::Value;
 }
 
-bool isComparableRuntimeValue(type::Type type) {
+bool isComparableRuntimeType(type::Type type) {
     return type == type::Boolean || type == type::String || type == type::Number || type == type::Null;
 }
 
-bool isSearchableRuntimeValue(type::Type type) {
+bool isSearchableRuntimeType(type::Type type) {
     return type == type::String || type.is<type::Array>() || type == type::Null;
 }
+} // namespace
+
+In::In(std::unique_ptr<Expression> needle_, std::unique_ptr<Expression> haystack_)
+    : Expression(Kind::In, type::Boolean), needle(std::move(needle_)), haystack(std::move(haystack_)) {
+    assert(isComparableType(needle->getType()));
+    assert(isSearchableRuntimeType(haystack->getType()) || haystack->getType() == type::Value);
 }
 
 EvaluationResult In::evaluate(const EvaluationContext& params) const {
-    const EvaluationResult evaluatedNeedle = needle->evaluate(params);
-    if (!evaluatedNeedle) {
-        return evaluatedNeedle.error();
-    }
-
     const EvaluationResult evaluatedHaystack = haystack->evaluate(params);
     if (!evaluatedHaystack) {
         return evaluatedHaystack.error();
     }
 
+    const EvaluationResult evaluatedNeedle = needle->evaluate(params);
+    if (!evaluatedNeedle) {
+        return evaluatedNeedle.error();
+    }
+
     type::Type evaluatedNeedleType = typeOf(*evaluatedNeedle);
-    if (!isComparableRuntimeValue(evaluatedNeedleType)) {
+    if (!isComparableRuntimeType(evaluatedNeedleType)) {
         return EvaluationError{"Expected first argument to be of type boolean, string or number, but found " +
                                toString(evaluatedNeedleType) + " instead."};
     }
 
     type::Type evaluatedHaystackType = typeOf(*evaluatedHaystack);
-    if (!isSearchableRuntimeValue(evaluatedHaystackType)) {
+    if (!isSearchableRuntimeType(evaluatedHaystackType)) {
         return EvaluationError{"Expected second argument to be of type array or string, but found " +
                                toString(evaluatedHaystackType) + " instead."};
     }
@@ -65,19 +71,8 @@ EvaluationResult In::evaluate(const EvaluationContext& params) const {
         return EvaluationResult(haystackString.find(needleValue) != std::string::npos);
     } else {
         const auto haystackArray = evaluatedHaystack->get<std::vector<Value>>();
-
-        bool result = false;
-        if (evaluatedNeedleType == type::Boolean) {
-            auto needleValue = evaluatedNeedle->get<bool>();
-            result = find(haystackArray.begin(), haystackArray.end(), needleValue) != haystackArray.end();
-        } else if (evaluatedNeedleType == type::String) {
-            auto needleValue = evaluatedNeedle->get<std::string>();
-            result = find(haystackArray.begin(), haystackArray.end(), needleValue) != haystackArray.end();
-        } else if (evaluatedNeedleType == type::Number) {
-            auto needleValue = evaluatedNeedle->get<double>();
-            result = find(haystackArray.begin(), haystackArray.end(), needleValue) != haystackArray.end();
-        }
-        return EvaluationResult(result);
+        return EvaluationResult(std::find(haystackArray.begin(), haystackArray.end(), *evaluatedNeedle) !=
+                                haystackArray.end());
     }
 }
 
diff --git a/test/fixtures/expression_equality/in.a.json b/test/fixtures/expression_equality/in.a.json
new file mode 100644
index 0000000000..2632695c6f
--- /dev/null
+++ b/test/fixtures/expression_equality/in.a.json
@@ -0,0 +1,20 @@
+[
+  "number",
+  [
+    "in",
+    [
+      "number",
+      [
+        "get",
+        "i"
+      ]
+    ],
+    [
+      "array",
+      [
+        "get",
+        "arr"
+      ]
+    ]
+  ]
+]
\ No newline at end of file
diff --git a/test/fixtures/expression_equality/in.b.json b/test/fixtures/expression_equality/in.b.json
new file mode 100644
index 0000000000..a63a94fb00
--- /dev/null
+++ b/test/fixtures/expression_equality/in.b.json
@@ -0,0 +1,20 @@
+[
+  "number",
+  [
+    "in",
+    [
+      "number",
+      [
+        "get",
+        "i"
+      ]
+    ],
+    [
+      "array",
+      [
+        "get",
+        "arr_other"
+      ]
+    ]
+  ]
+]
\ No newline at end of file
-- 
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