upgrade to Filament 1.21.0

ios/include/filamat/IncludeCallback.h

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+/*
+ * Copyright (C) 2019 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef TNT_FILAMAT_INCLUDER_H
+#define TNT_FILAMAT_INCLUDER_H
+
+#include <utils/CString.h>
+
+#include <functional>
+
+namespace filamat {
+
+struct IncludeResult {
+    // The include name of the root file, as if it were being included.
+    // I.e., 'foobar.h' in the case of #include "foobar.h"
+    const utils::CString includeName;
+
+    // The following fields should be filled out by the IncludeCallback when processing an include,
+    // or when calling resolveIncludes for the root file.
+
+    // The full contents of the include file. This may contain additional, recursive include
+    // directives.
+    utils::CString text;
+
+    // The line number for the first line of text (first line is 0).
+    size_t lineNumberOffset = 0;
+
+    // The name of the include file. This gets passed as "includerName" for any includes inside of
+    // source. This field isn't used by the include system; it's up to the callback to give meaning
+    // to this value and interpret it accordingly.  In the case of DirIncluder, this is an empty
+    // string to represent the root include file, and a canonical path for subsequent included
+    // files.
+    utils::CString name;
+};
+
+/**
+ * A callback invoked by the include system when an #include "file.h" directive is found.
+ *
+ * For example, if a file main.h includes file.h on line 10, then IncludeCallback would be called
+ * with the following:
+ *     includeCallback("main.h", {.includeName = "file.h" })
+ * It's then up to the IncludeCallback to fill out the .text, .name, and (optionally)
+ * lineNumberOffset fields.
+ *
+ * @param includedBy is the value that was given to IncludeResult.name for this source file, or
+ *        the empty string for the root source file.
+ * @param result is the IncludeResult that the callback should fill out.
+ * @return true, if the include was resolved successfully, false otherwise.
+ *
+ * For an example of implementing this callback, see tools/matc/src/matc/DirIncluder.h.
+ */
+using IncludeCallback = std::function<bool(
+        const utils::CString& includedBy,
+        IncludeResult& result)>;
+
+} // namespace filamat
+
+#endif