1 files changed, 34 insertions, 0 deletions
diff --git a/gfx/skia/skia/src/sksl/SkSLPosition.cpp b/gfx/skia/skia/src/sksl/SkSLPosition.cpp
new file mode 100644
index 0000000000..494accaf7b
--- /dev/null
+++ b/gfx/skia/skia/src/sksl/SkSLPosition.cpp
@@ -0,0 +1,34 @@
+/*
+ * Copyright 2022 Google LLC.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "include/sksl/SkSLPosition.h"
+
+#include <algorithm>
+
+namespace SkSL {
+
+int Position::line(std::string_view source) const {
+    SkASSERT(this->valid());
+    if (fStartOffset == -1) {
+        return -1;
+    }
+    if (!source.data()) {
+        return -1;
+    }
+    // we allow the offset to equal the length, because that's where TK_END_OF_FILE is reported
+    SkASSERT(fStartOffset <= (int)source.length());
+    int offset = std::min(fStartOffset, (int)source.length());
+    int line = 1;
+    for (int i = 0; i < offset; i++) {
+        if (source[i] == '\n') {
+            ++line;
+        }
+    }
+    return line;
+}
+
+} // namespace SkSL