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• czech-bool-expression
• 1.0.1
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• StringInputSystem.java

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package com.github.jalasoft.expression.czech.input;

import java.util.Optional;

public final class StringInputSystem implements InputSystem {

    private final String input;
    private int index;

    public StringInputSystem(String input) {
        this.input = input;
    }

    @Override
    public Optional nextSymbol() {
        if (index >= input.length()) {
            return Optional.empty();
        }

        return Optional.of(input.charAt(index++));
    }
}