w3c.css.properties.css1.CssMargin 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.css1;

import org.w3c.css.properties.css.CssProperty;
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/2008/REC-CSS1-20080411/#margin
 */
public class CssMargin extends org.w3c.css.properties.css.CssMargin {

    public static final CssIdent auto = CssIdent.getIdent("auto");

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


    /**
     * 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 CssMargin(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 CssMargin(ApplContext ac, CssExpression expression,
                     boolean check) throws InvalidParamException {
        if (check && expression.getCount() > 4) {
            throw new InvalidParamException("unrecognize", ac);
        }
        CssValue val;
        char op;
        ArrayList v = new ArrayList();

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

            switch (val.getType()) {
                case CssTypes.CSS_NUMBER:
                    val.getLength();
                case CssTypes.CSS_LENGTH:
                case CssTypes.CSS_PERCENTAGE:
                    v.add(val);
                    break;
                case CssTypes.CSS_IDENT:
                    if (auto.equals(val)) {
                        v.add(auto);
                        break;
                    }
                default:
                    throw new InvalidParamException("value",
                            val.toString(),
                            getPropertyName(), ac);
            }
            if (op != SPACE) {
                throw new InvalidParamException("operator",
                        ((new Character(op)).toString()), ac);

            }
            expression.next();
        }
        // now we check the number of values...
        marginBottom = new CssMarginBottom();
        marginLeft = new CssMarginLeft();
        marginTop = new CssMarginTop();
        marginRight = new CssMarginRight();

        switch (v.size()) {
            case 1:
                marginTop.value = v.get(0);
                marginRight.value = v.get(0);
                marginBottom.value = v.get(0);
                marginLeft.value = v.get(0);
                break;
            case 2:
                marginTop.value = v.get(0);
                marginRight.value = v.get(1);
                marginBottom.value = v.get(0);
                marginLeft.value = v.get(1);
                break;
            case 3:
                marginTop.value = v.get(0);
                marginRight.value = v.get(1);
                marginBottom.value = v.get(2);
                marginLeft.value = v.get(1);
                break;
            case 4:
                marginTop.value = v.get(0);
                marginRight.value = v.get(1);
                marginBottom.value = v.get(2);
                marginLeft.value = v.get(3);
                break;
            default:
                // can't happen unless we are not checking
                // the size
                throw new InvalidParamException("unrecognize", ac);
        }
        value = new CssValueList(v);
    }

    // for use by individual margin-* properties

    protected static CssValue checkValue(ApplContext ac,
                                         CssExpression expression,
                                         boolean check, CssProperty caller)
            throws InvalidParamException {
        if (check && expression.getCount() > 1) {
            throw new InvalidParamException("unrecognize", ac);
        }
        CssValue val;
        char op;

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

        switch (val.getType()) {
            case CssTypes.CSS_NUMBER:
                val.getLength();
            case CssTypes.CSS_LENGTH:
            case CssTypes.CSS_PERCENTAGE:
                expression.next();
                return val;
            case CssTypes.CSS_IDENT:
                if (auto.equals(val)) {
                    expression.next();
                    return auto;
                }
                // if not inherit, or not an ident
                // let it flow to the exception
        }
        throw new InvalidParamException("value",
                val.toString(),
                caller.getPropertyName(), ac);
    }
}