w3c.css.properties.css3.CssVerticalAlign Maven / Gradle / Ivy

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Backend for the W3C CSS Validation Service
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//
// Author: Yves Lafon 
//
// (c) COPYRIGHT MIT, ERCIM, Keio, Beihang 2015.
// Please first read the full copyright statement in file COPYRIGHT.html
package org.w3c.css.properties.css3;

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.CssOperator;
import org.w3c.css.values.CssTypes;
import org.w3c.css.values.CssValue;
import org.w3c.css.values.CssValueList;

import java.util.ArrayList;

/**
 * @spec http://www.w3.org/TR/2016/WD-css-inline-3-20160524/#propdef-vertical-align
 */
public class CssVerticalAlign extends org.w3c.css.properties.css.CssVerticalAlign {

    /**
     * Create a new CssVerticalAlign
     */
    public CssVerticalAlign() {
        value = initial;
    }

    /**
     * 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 CssVerticalAlign(ApplContext ac, CssExpression expression,
                            boolean check) throws InvalidParamException {

        if (check && expression.getCount() > 2) {
            throw new InvalidParamException("unrecognize", ac);
        }

        ArrayList v = new ArrayList<>(2);
        setByUser();
        char op;
        CssValue val;
        CssIdent res;
        boolean got_shift = false;
        boolean got_alignment = false;

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

            switch (val.getType()) {
                case CssTypes.CSS_NUMBER:
                    val.getCheckableValue().checkEqualsZero(ac, this);
                case CssTypes.CSS_LENGTH:
                case CssTypes.CSS_PERCENTAGE:
                    if (got_shift) {
                        throw new InvalidParamException("value", expression.getValue(),
                                getPropertyName(), ac);
                    }
                    got_shift = true;
                    v.add(val);
                    break;
                case CssTypes.CSS_IDENT:
                    CssIdent id = (CssIdent) val;
                    if (inherit.equals(id)) {
                        // inherit can only be alone
                        if (expression.getCount() > 1) {
                            throw new InvalidParamException("value", expression.getValue(),
                                    getPropertyName(), ac);
                        }
                        value = inherit;
                        break;
                    }
                    if (!got_shift) {
                        res = CssBaselineShift.getAllowedIdent(id);
                        if (res != null) {
                            v.add(res);
                            got_shift = true;
                            break;
                        }
                    }
                    if (!got_alignment) {
                        res = CssAlignmentBaseline.getAllowedIdent(id);
                        if (res != null) {
                            got_alignment = true;
                            v.add(res);
                            break;
                        }
                    }
                    // failed...
                default:
                    throw new InvalidParamException("value", val,
                            getPropertyName(), ac);
            }
            if (op != CssOperator.SPACE) {
                throw new InvalidParamException("operator",
                        ((new Character(op)).toString()), ac);
            }
            expression.next();
        }
        if (value != inherit) {
            value = (v.size() == 1) ? v.get(0) : new CssValueList(v);
        }
    }

    public CssVerticalAlign(ApplContext ac, CssExpression expression)
            throws InvalidParamException {
        this(ac, expression, false);
    }


}