1 files changed, 86 insertions, 0 deletions
diff --git a/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/CustomType.swift b/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/CustomType.swift
new file mode 100644
index 0000000000..504cadfc1d
--- /dev/null
+++ b/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/CustomType.swift
@@ -0,0 +1,86 @@
+{%- let ffi_type_name=builtin|ffi_type|ffi_type_name %}
+{%- match config.custom_types.get(name.as_str())  %}
+{%- when None %}
+{#- No config, just forward all methods to our builtin type #}
+/**
+ * Typealias from the type name used in the UDL file to the builtin type.  This
+ * is needed because the UDL type name is used in function/method signatures.
+ */
+public typealias {{ name }} = {{ builtin|type_name }}
+public struct FfiConverterType{{ name }}: FfiConverter {
+    public static func read(from buf: inout (data: Data, offset: Data.Index)) throws -> {{ name }} {
+        return try {{ builtin|read_fn }}(from: &buf)
+    }
+
+    public static func write(_ value: {{ name }}, into buf: inout [UInt8]) {
+        return {{ builtin|write_fn }}(value, into: &buf)
+    }
+
+    public static func lift(_ value: {{ ffi_type_name }}) throws -> {{ name }} {
+        return try {{ builtin|lift_fn }}(value)
+    }
+
+    public static func lower(_ value: {{ name }}) -> {{ ffi_type_name }} {
+        return {{ builtin|lower_fn }}(value)
+    }
+}
+
+{%- when Some with (config) %}
+
+{# When the config specifies a different type name, create a typealias for it #}
+{%- match config.type_name %}
+{%- when Some with (concrete_type_name) %}
+/**
+ * Typealias from the type name used in the UDL file to the custom type.  This
+ * is needed because the UDL type name is used in function/method signatures.
+ */
+public typealias {{ name }} = {{ concrete_type_name }}
+{%- else %}
+{%- endmatch %}
+
+{%- match config.imports %}
+{%- when Some(imports) %}
+{%- for import_name in imports %}
+{{ self.add_import(import_name) }}
+{%- endfor %}
+{%- else %}
+{%- endmatch %}
+
+public struct FfiConverterType{{ name }}: FfiConverter {
+    {#- Custom type config supplied, use it to convert the builtin type #}
+
+    public static func read(from buf: inout (data: Data, offset: Data.Index)) throws -> {{ name }} {
+        let builtinValue = try {{ builtin|read_fn }}(from: &buf)
+        return {{ config.into_custom.render("builtinValue") }}
+    }
+
+    public static func write(_ value: {{ name }}, into buf: inout [UInt8]) {
+        let builtinValue = {{ config.from_custom.render("value") }}
+        return {{ builtin|write_fn }}(builtinValue, into: &buf)
+    }
+
+    public static func lift(_ value: {{ ffi_type_name }}) throws -> {{ name }} {
+        let builtinValue = try {{ builtin|lift_fn }}(value)
+        return {{ config.into_custom.render("builtinValue") }}
+    }
+
+    public static func lower(_ value: {{ name }}) -> {{ ffi_type_name }} {
+        let builtinValue = {{ config.from_custom.render("value") }}
+        return {{ builtin|lower_fn }}(builtinValue)
+    }
+}
+
+{%- endmatch %}
+
+{#
+We always write these public functions just incase the type is used as
+an external type by another crate.
+#}
+public func FfiConverterType{{ name }}_lift(_ value: {{ ffi_type_name }}) throws -> {{ name }} {
+    return try FfiConverterType{{ name }}.lift(value)
+}
+
+public func FfiConverterType{{ name }}_lower(_ value: {{ name }}) -> {{ ffi_type_name }} {
+    return FfiConverterType{{ name }}.lower(value)
+}
+