AtLeastChecker.java

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// to you under the Apache License, Version 2.0 (the
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//
//   http://www.apache.org/licenses/LICENSE-2.0
//
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package org.apache.doris.nereids.trees.expressions.literal.format;

import java.util.Objects;
import java.util.function.Predicate;

/** AtLeastChecker */
public class AtLeastChecker extends FormatChecker {
    private final int minCount;
    private final int maxRead;
    private final Predicate<Character> checker;

    public AtLeastChecker(String name, int minCount, int maxRead, Predicate<Character> checker) {
        super(name);
        this.minCount = minCount;
        this.maxRead = maxRead;
        this.checker = Objects.requireNonNull(checker, "checker can not be null");
    }

    @Override
    protected boolean doCheck(StringInspect stringInspect) {
        int count = 0;
        boolean checkRead = maxRead >= 0;
        while (!stringInspect.eos() && (!checkRead || count < maxRead)) {
            if (!checker.test(stringInspect.lookAt())) {
                break;
            }
            stringInspect.step();
            count++;
        }
        return count >= minCount;
    }
}