[core, ios, macos, android] Add data-driven-styling support for `text-font`

1 files changed, 75 insertions, 0 deletions

diff --git a/test/style/style_parser.test.cpp b/test/style/style_parser.test.cpp
index 5fa81b47e9..7f7c06f4c5 100644
--- a/test/style/style_parser.test.cpp
+++ b/test/style/style_parser.test.cpp
@@ -102,3 +102,78 @@ TEST(StyleParser, FontStacks) {
     ASSERT_EQ(FontStack({"a", "b"}), result[1]);
     ASSERT_EQ(FontStack({"a", "b", "c"}), result[2]);
 }
+
+TEST(StyleParser, FontStacksCaseExpression) {
+    style::Parser parser;
+    parser.parse(R"({
+        "version": 8,
+        "layers": [{
+            "id": "symbol",
+            "type": "symbol",
+            "source": "vector",
+            "layout": {
+                "text-font": ["case", ["==", "a", ["string", ["get", "text-font"]]], ["literal", ["Arial"]], ["literal", ["Helvetica"]]]
+            }
+        }]
+    })");
+    auto result = parser.fontStacks();
+    ASSERT_EQ(2u, result.size());
+    ASSERT_EQ(FontStack({"Arial"}), result[0]);
+    ASSERT_EQ(FontStack({"Helvetica"}), result[1]);
+}
+
+TEST(StyleParser, FontStacksMatchExpression) {
+    style::Parser parser;
+    parser.parse(R"({
+        "version": 8,
+        "layers": [{
+            "id": "symbol",
+            "type": "symbol",
+            "source": "vector",
+            "layout": {
+                "text-font": ["match", ["get", "text-font"], "a", ["literal", ["Arial"]], ["literal", ["Helvetica"]]]
+            }
+        }]
+    })");
+    auto result = parser.fontStacks();
+    ASSERT_EQ(2u, result.size());
+    ASSERT_EQ(FontStack({"Arial"}), result[0]);
+    ASSERT_EQ(FontStack({"Helvetica"}), result[1]);
+}
+
+TEST(StyleParser, FontStacksStepExpression) {
+    style::Parser parser;
+    parser.parse(R"({
+        "version": 8,
+        "layers": [{
+            "id": "symbol",
+            "type": "symbol",
+            "source": "vector",
+            "layout": {
+                "text-font": ["array", "string", ["step", ["get", "text-font"], ["literal", ["Arial"]], 0, ["literal", ["Helvetica"]]]]
+            }
+        }]
+    })");
+    auto result = parser.fontStacks();
+    ASSERT_EQ(2u, result.size());
+    ASSERT_EQ(FontStack({"Arial"}), result[0]);
+    ASSERT_EQ(FontStack({"Helvetica"}), result[1]);
+}
+
+TEST(StyleParser, FontStacksGetExpression) {
+    // Invalid style, but not currently validated.
+    style::Parser parser;
+    parser.parse(R"({
+        "version": 8,
+        "layers": [{
+            "id": "symbol",
+            "type": "symbol",
+            "source": "vector",
+            "layout": {
+                "text-font": ["array", "string", ["get", "text-font"]]
+            }
+        }]
+    })");
+    auto result = parser.fontStacks();
+    ASSERT_EQ(0u, result.size());
+}