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Truffle is a multi-language framework for executing dynamic languages that achieves high performance when combined with Graal.

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/*
 * Copyright (c) 2021, 2021, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * The Universal Permissive License (UPL), Version 1.0
 *
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 * person obtaining a copy of this software, associated documentation and/or
 * data (collectively the "Software"), free of charge and under any and all
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 * unmodified Software as contributed to or provided by such licensor, or (ii)
 * the Larger Works (as defined below), to deal in both
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 * (a) the Software, and
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 * (b) any piece of software and/or hardware listed in the lrgrwrks.txt file if
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 * is contributed by such licensors),
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package com.oracle.truffle.api.strings;

import com.oracle.truffle.api.strings.TruffleString.Encoding;

final class Stride {

    static boolean isStride(int stride) {
        return 0 <= stride && stride <= 2;
    }

    static int fromCodeRange(int codeRange, Encoding encoding) {
        if (TStringGuards.isUTF16(encoding)) {
            return fromCodeRangeUTF16(codeRange);
        } else if (TStringGuards.isUTF32(encoding)) {
            return fromCodeRangeUTF32(codeRange);
        } else {
            return 0;
        }
    }

    static int fromCodeRangeUTF16(int codeRange) {
        return TSCodeRange.toStrideUTF16(codeRange);
    }

    static int fromCodeRangeUTF32(int codeRange) {
        return TSCodeRange.toStrideUTF32(codeRange);
    }
}