cz.vutbr.web.csskit.fn.StepsImpl Maven / Gradle / Ivy

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jStyleParser is a CSS parser written in Java. It has its own application interface that is designed to allow an efficient CSS processing in Java and mapping the values to the Java data types. It parses CSS 2.1 style sheets into structures that can be efficiently assigned to DOM elements. It is intended be the primary CSS parser for the CSSBox library. While handling errors, it is user agent conforming according to the CSS specification.

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/*
 */
package cz.vutbr.web.csskit.fn;

import cz.vutbr.web.css.Term;
import cz.vutbr.web.css.TermFunction;
import cz.vutbr.web.css.TermIdent;
import cz.vutbr.web.css.TermInteger;
import cz.vutbr.web.css.TermList;
import cz.vutbr.web.csskit.TermFunctionImpl;
import java.util.List;

/**
 *
 * @author Petr Mikulík
 */
public class StepsImpl extends TermFunctionImpl implements TermFunction.Steps {

    private int _numberOfSteps;
    private Direction _direciton;
    
    public StepsImpl() {
        setValid(false);
    }

    @Override
    public TermList setValue(List> value) {
        super.setValue(value);
        List>> args = getSeparatedArgs(DEFAULT_ARG_SEP);
        if (args != null) {
            if (args.size() == 1) {
                if (setNumberOfSteps(args.get(0))) {
                    _direciton = Direction.END;
                    setValid(true);
                }
            } else if (args.size() == 2) {
                if (setNumberOfSteps(args.get(0)) && setDirection(args.get(1))) {
                    setValid(true);
                }
            }
        }
        return this;
    }

    @Override
    public int getNumberOfSteps() {
        return _numberOfSteps;
    }

    @Override
    public Direction getDirection() {
        return _direciton;
    }

    private boolean setNumberOfSteps(List> argTerms) {
        if (argTerms.size() == 1) {
            Term t = argTerms.get(0);
            if (t instanceof TermInteger) {
                int value = ((TermInteger) t).getIntValue();
                if (value > 0) {
                    _numberOfSteps = value;
                    return true;
                }
            }
        }
        return false;
    }

    private boolean setDirection(List> argTerms) {
        if (argTerms.size() == 1) {
            Term t = argTerms.get(0);
            if (t instanceof TermIdent) {
                String value = ((TermIdent) t).getValue();
                for (Direction d : Direction.values()) {
                    if (d.toString().equals(value)) {
                        _direciton = d;
                        return true;
                    }
                }
            }
        }
        return false;
    }

}