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

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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.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/2013/WD-css-text-decor-3-20130103/#text-underline-position
 */
public class CssTextUnderlinePosition extends org.w3c.css.properties.css.CssTextUnderlinePosition {

    public static final CssIdent auto, alphabetic, below;
    public static final CssIdent[] horizontalValues;

    static {
        String[] _horizontalValues = {"left", "right"};
        horizontalValues = new CssIdent[_horizontalValues.length];
        int i = 0;
        for (String s : _horizontalValues) {
            horizontalValues[i++] = CssIdent.getIdent(s);
        }
        alphabetic = CssIdent.getIdent("alphabetic");
        below = CssIdent.getIdent("under");
        auto = CssIdent.getIdent("auto");
    }

    public static CssIdent getHorizontalValue(CssIdent ident) {
        for (CssIdent id : horizontalValues) {
            if (id.equals(ident)) {
                return id;
            }
        }
        return null;
    }

    public static final CssIdent getAllowedValue(CssIdent ident) {
        if (auto.equals(ident)) {
            return auto;
        }
        if (alphabetic.equals(ident)) {
            return alphabetic;
        }
        if (below.equals(ident)) {
            return below;
        }
        return getHorizontalValue(ident);
    }

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

    /**
     * Creates a new CssTextUnderlinePosition
     *
     * @param expression The expression for this property
     * @throws org.w3c.css.util.InvalidParamException
     *          Expressions are incorrect
     */
    public CssTextUnderlinePosition(ApplContext ac, CssExpression expression, boolean check)
            throws InvalidParamException {
        if (check && expression.getCount() > 4) {
            throw new InvalidParamException("unrecognize", ac);
        }
        setByUser();

        CssValue val;
        char op;

        CssIdent horValue = null;
        CssIdent verValue = null;

        val = expression.getValue();
        op = expression.getOperator();

        if (val.getType() != CssTypes.CSS_IDENT) {
            throw new InvalidParamException("value",
                    val.toString(),
                    getPropertyName(), ac);
        }

        CssIdent ident = (CssIdent) val;
        if (inherit.equals(ident)) {
            value = inherit;
            if (check && expression.getCount() != 1) {
                throw new InvalidParamException("value",
                        val.toString(),
                        getPropertyName(), ac);
            }
        } else if (auto.equals(ident)) {
            value = auto;
            if (check && expression.getCount() != 1) {
                throw new InvalidParamException("value",
                        val.toString(),
                        getPropertyName(), ac);
            }
        } else if (alphabetic.equals(ident)) {
            value = alphabetic;
            if (check && expression.getCount() != 1) {
                throw new InvalidParamException("value",
                        val.toString(),
                        getPropertyName(), ac);
            }
        } else {
            int nbgot = 0;
            do {
                boolean match = false;
                if (verValue == null && below.equals(ident)) {
                    verValue = below;
                    match = true;
                } else if (horValue == null) {
                    horValue = getHorizontalValue(ident);
                    match = (horValue != null);
                }
                if (!match) {
                    throw new InvalidParamException("value",
                            val.toString(),
                            getPropertyName(), ac);
                }
                nbgot++;
                if (expression.getRemainingCount() == 1 || (!check && nbgot == 2)) {
                    // if we have both, exit
                    // (needed only if check == false...
                    break;
                }
                if (op != CssOperator.SPACE) {
                    throw new InvalidParamException("operator",
                            ((new Character(op)).toString()), ac);
                }
                expression.next();
                val = expression.getValue();
                op = expression.getOperator();
                if (val.getType() != CssTypes.CSS_IDENT) {
                    throw new InvalidParamException("value",
                            val.toString(),
                            getPropertyName(), ac);
                }
                ident = (CssIdent) val;
            } while (!expression.end());
            // now construct the value
            ArrayList v = new ArrayList(nbgot);
            if (horValue != null) {
                v.add(horValue);
            }
            if (verValue != null) {
                v.add(verValue);
            }
            value = (nbgot > 1) ? new CssValueList(v) : v.get(0);
        }
        expression.next();

    }

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