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package org.pkl.thirdparty.truffle.api.strings;

import org.pkl.thirdparty.truffle.api.strings.TruffleString.Encoding;

final class Stride {

    static final String STRIDE_CACHE_LIMIT = "3";
    static final int STRIDE_UNROLL = 3;

    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 fromCodeRangeAllowImprecise(int codeRange, Encoding encoding) {
        if (TStringGuards.isUTF16(encoding)) {
            return fromCodeRangeUTF16AllowImprecise(codeRange);
        } else if (TStringGuards.isUTF32(encoding)) {
            return fromCodeRangeUTF32AllowImprecise(codeRange);
        } else {
            return 0;
        }
    }

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

    static int fromCodeRangeUTF16AllowImprecise(int codeRange) {
        return TSCodeRange.toStrideUTF16AllowImprecise(codeRange);
    }

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

    static int fromCodeRangeUTF32AllowImprecise(int codeRange) {
        return TSCodeRange.toStrideUTF32AllowImprecise(codeRange);
    }

}