DigitChecker.java

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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;

/** DigitChecker */
public class DigitChecker extends FormatChecker {
    private final int minCount;
    private final int maxRead;

    public DigitChecker(String name, int minCount, int maxRead) {
        super(name);
        this.minCount = minCount;
        this.maxRead = maxRead;
    }

    @Override
    protected boolean doCheck(StringInspect stringInspect) {
        int numberCount = 0;
        boolean checkRead = maxRead >= 0;
        while (!stringInspect.eos() && (!checkRead || numberCount < maxRead)) {
            char c = stringInspect.lookAt();
            if (!('0' <= c && c <= '9')) {
                break;
            }
            stringInspect.step();
            numberCount++;
        }
        return numberCount >= minCount;
    }
}