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

Go to download
Show more of this group Show more artifacts with this name
Show all versions of cssvalidator Show documentation
Backend for the W3C CSS Validation Service
There is a newer version: 1.0.8
//
// Author: Yves Lafon 
//
// (c) COPYRIGHT MIT, ERCIM, Keio, Beihang, 2016.
// Please first read the full copyright statement in file COPYRIGHT.html
package org.w3c.css.properties.css3;

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 https://www.w3.org/TR/2016/CR-css-flexbox-1-20160526/#propdef-align-content
 * @spec https://www.w3.org/TR/2018/WD-css-align-3-20180423/#propdef-align-content
 */
public class CssAlignContent extends org.w3c.css.properties.css.CssAlignContent {

    public static final CssIdent baseline, normal;
    public static final CssIdent[] baseline_qualifier, content_distribution,
            overflow_position, content_position;

    static {
        baseline = CssIdent.getIdent("baseline");
        normal = CssIdent.getIdent("normal");

        String[] _baseline_qualifier_values = {"first", "last"};
        baseline_qualifier = new CssIdent[_baseline_qualifier_values.length];
        int i = 0;
        for (String s : _baseline_qualifier_values) {
            baseline_qualifier[i++] = CssIdent.getIdent(s);
        }
        i = 0;
        String[] _content_distribution_values = {"space-between", "space-around",
                "space-evenly", "stretch"};
        content_distribution = new CssIdent[_content_distribution_values.length];
        for (String s : _content_distribution_values) {
            content_distribution[i++] = CssIdent.getIdent(s);
        }
        i = 0;
        String[] _overflow_position_values = {"unsafe", "safe"};
        overflow_position = new CssIdent[_overflow_position_values.length];
        for (String s : _overflow_position_values) {
            overflow_position[i++] = CssIdent.getIdent(s);
        }
        i = 0;
        String[] _content_position_values = {"center", "start", "end",
                "flex-start", "flex-end"};
        content_position = new CssIdent[_content_position_values.length];
        for (String s : _content_position_values) {
            content_position[i++] = CssIdent.getIdent(s);
        }
    }

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

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

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

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


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

    /**
     * Creates a new CssAlignContent
     *
     * @param expression The expression for this property
     * @throws org.w3c.css.util.InvalidParamException
     *          Expressions are incorrect
     */
    public CssAlignContent(ApplContext ac, CssExpression expression, boolean check)
            throws InvalidParamException {
        if (check && expression.getCount() > 2) {
            throw new InvalidParamException("unrecognize", ac);
        }
        setByUser();

        value = parseAlignContent(ac, expression, this);
        if (!expression.end()) {
            throw new InvalidParamException("unrecognize", ac);
        }
    }

    public static CssValue parseAlignContent(ApplContext ac, CssExpression expression,
                                             CssProperty caller)
            throws InvalidParamException {
        CssValue val, value;
        ArrayList values = new ArrayList<>();
        char op;

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

        if (val.getType() == CssTypes.CSS_IDENT) {
            CssIdent ident = (CssIdent) val;
            if (inherit.equals(ident)) {
                if (expression.getCount() > 1) {
                    throw new InvalidParamException("value", val.toString(),
                            caller.getPropertyName(), ac);
                }
                expression.next();
                return inherit;
            }
            if (normal.equals(ident)) {
                expression.next();
                return normal;
            }
            value = getContentDistribution(ident);
            if (value != null) {
                expression.next();
                return value;
            }
            // now try the two-values position, starting first with only one.
            if (baseline.equals(ident)) {
                expression.next();
                return baseline;
            }
            value = getContentPosition(ident);
            if (value != null) {
                expression.next();
                return value;
            }
            // ok, at that point we need two values.
            value = getBaselineQualifier(ident);
            if (value != null) {
                values.add(value);
                if (op != SPACE) {
                    throw new InvalidParamException("operator",
                            ((new Character(op)).toString()), ac);
                }
                expression.next();
                if (expression.end()) {
                    throw new InvalidParamException("unrecognize", ac);
                }
                val = expression.getValue();
                if (val.getType() != CssTypes.CSS_IDENT || !baseline.equals(val)) {
                    throw new InvalidParamException("value", val.toString(),
                            caller.getPropertyName(), ac);
                }
                values.add(baseline);
                expression.next();
                return new CssValueList(values);
            }
            value = getOverflowPosition(ident);
            if (value != null) {
                values.add(value);
                if (op != SPACE) {
                    throw new InvalidParamException("operator",
                            ((new Character(op)).toString()), ac);
                }
                expression.next();
                if (expression.end()) {
                    throw new InvalidParamException("unrecognize", ac);
                }
                val = expression.getValue();
                if (val.getType() != CssTypes.CSS_IDENT) {
                    throw new InvalidParamException("value", val.toString(),
                            caller.getPropertyName(), ac);
                }
                value = getContentPosition((CssIdent) val);
                if (value == null) {
                    throw new InvalidParamException("value", val.toString(),
                            caller.getPropertyName(), ac);
                }
                values.add(value);
                expression.next();
                return new CssValueList(values);
            }

        }
        throw new InvalidParamException("value",
                val.toString(),
                caller.getPropertyName(), ac);
    }

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

}