w3c.css.properties.css21.CssListStyle Maven / Gradle / Ivy

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Backend for the W3C CSS Validation Service
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// $Id$
// Author: Yves Lafon 
//
// (c) COPYRIGHT MIT, ERCIM and Keio University, 2012.
// Please first read the full copyright statement in file COPYRIGHT.html
package org.w3c.css.properties.css21;

import org.w3c.css.util.ApplContext;
import org.w3c.css.util.InvalidParamException;
import org.w3c.css.values.CssExpression;
import org.w3c.css.values.CssIdent;
import org.w3c.css.values.CssTypes;
import org.w3c.css.values.CssValue;
import org.w3c.css.values.CssValueList;

import java.util.ArrayList;

import static org.w3c.css.values.CssOperator.SPACE;

/**
 * @spec http://www.w3.org/TR/2011/REC-CSS2-20110607/generate.html#propdef-list-style
 */
public class CssListStyle extends org.w3c.css.properties.css.CssListStyle {

    /**
     * Create a new CssListStyle
     */
    public CssListStyle() {
    }


    /**
     * Set the value of the property

     * Does not check the number of values
     *
     * @param expression The expression for this property
     * @throws org.w3c.css.util.InvalidParamException
     *          The expression is incorrect
     */
    public CssListStyle(ApplContext ac, CssExpression expression)
            throws InvalidParamException {
        this(ac, expression, false);
    }

    /**
     * Set the value of the property
     *
     * @param expression The expression for this property
     * @param check      set it to true to check the number of values
     * @throws org.w3c.css.util.InvalidParamException
     *          The expression is incorrect
     */
    public CssListStyle(ApplContext ac, CssExpression expression,
                        boolean check) throws InvalidParamException {
        if (check && expression.getCount() > 3) {
            throw new InvalidParamException("unrecognize", ac);
        }
        setByUser();

        CssValue val;
        char op;
        CssValue imageVal = null;
        CssValue positionVal = null;
        CssValue typeVal = null;
        int nbnone = 0;

        while (!expression.end()) {
            val = expression.getValue();
            op = expression.getOperator();

            switch (val.getType()) {
                case CssTypes.CSS_URL:
                    if (imageVal != null) {
                        throw new InvalidParamException("value", val,
                                getPropertyName(), ac);
                    }
                    imageVal = val;
                    break;
                case CssTypes.CSS_IDENT:
                    if (inherit.equals(val)) {
                        if (expression.getCount() > 1) {
                            throw new InvalidParamException("unrecognize", ac);
                        }
                        value = inherit;
                        imageVal = inherit;
                        positionVal = inherit;
                        typeVal = inherit;
                        break;
                    }
                    if (none.equals(val)) {
                        nbnone++;
                        break;
                    }
                    // now we go to other values...
                    CssIdent id = (CssIdent) val;
                    if (positionVal == null) {
                        positionVal = CssListStylePosition.getAllowedIdent(id);
                        if (positionVal != null) {
                            break;
                        }
                    }
                    if (typeVal == null) {
                        typeVal = CssListStyleType.getAllowedIdent(id);
                        if (typeVal != null) {
                            break;
                        }
                    }
                    // unrecognized ident.. fail!
                default:
                    throw new InvalidParamException("value", val,
                            getPropertyName(), ac);
            }
            if (op != SPACE) {
                throw new InvalidParamException("operator",
                        ((new Character(op)).toString()), ac);
            }
            expression.next();
        }
        // some postprocessing...
        if (nbnone > 0) {
            switch (nbnone) {
                case 1:
                    // we set the value ot the non-specified by the shorthand
                    // values...
                    if (imageVal != null && typeVal != null) {
                        // TODO duplicate value error
                        throw new InvalidParamException("value", none,
                                getPropertyName(), ac);
                    }
                    if (typeVal == null) {
                        typeVal = none;
                    }
                    if (imageVal == null) {
                        imageVal = none;
                    }
                    break;
                case 2:
                    if (imageVal != null || typeVal != null) {
                        // TODO duplicate value error
                        throw new InvalidParamException("value", none,
                                getPropertyName(), ac);
                    }
                    typeVal = none;
                    imageVal = none;
                    break;
                default:
                    throw new InvalidParamException("value", none,
                            getPropertyName(), ac);
            }
        }

        // set the value
        if (value != inherit) {
            ArrayList v = new ArrayList();
            if (typeVal != null) {
                v.add(typeVal);
            }
            if (positionVal != null) {
                v.add(positionVal);
            }
            if (imageVal != null) {
                if (nbnone != 1 || typeVal != none || imageVal != none) {
                    v.add(imageVal);
                }
            }
            value = (v.size() == 1) ? v.get(0) : new CssValueList(v);
        }
        // then the shorthand values
        cssListStyleType = new CssListStyleType();
        cssListStyleType.value = typeVal;
        cssListStylePosition = new CssListStylePosition();
        cssListStylePosition.value = positionVal;
        cssListStyleImage = new CssListStyleImage();
        cssListStyleImage.value = imageVal;
    }
}