com.gargoylesoftware.htmlunit.javascript.host.css.ComputedFont Maven / Gradle / Ivy

Show more of this group Show more artifacts with this name
Show all versions of xlt Show documentation

XLT (Xceptance LoadTest) is an extensive load and performance test tool developed and maintained by Xceptance.

There is a newer version: 8.1.0

/*
 * Copyright (c) 2002-2021 Gargoyle Software Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.gargoylesoftware.htmlunit.javascript.host.css;

import static com.gargoylesoftware.htmlunit.javascript.host.css.CSSStyleDeclaration.isLength;

/**
 * A helper class for handling font attributes of {@link ComputedCSSStyleDeclaration}.
 *
 * @author Ahmed Ashour
 * @author Ronald Brill
 */
final class ComputedFont {

    static final int FONT_SIZE_INDEX = 3;
    static final int LINE_HEIGHT_INDEX = 4;
    static final int FONT_FAMILY_INDEX = 5;

    static String[] getDetails(final String font, final boolean handleSpaceAfterSlash) {
        String fontName = font;
        while (fontName.contains("  ")) {
            fontName = fontName.replace("  ", " ");
        }
        if (!handleSpaceAfterSlash && fontName.contains("/ ")) {
            return null;
        }
        final String[] tokens = fontName.split(" ");
        if (tokens.length > 1) {
            final String[] fontSizeDetails = getFontSizeDetails(tokens[tokens.length - 2]);
            if (fontSizeDetails == null) {
                return null;
            }
            final String[] details = new String[6];
            details[FONT_SIZE_INDEX] = fontSizeDetails[0];
            details[LINE_HEIGHT_INDEX] = fontSizeDetails[1];
            details[FONT_FAMILY_INDEX] = tokens[tokens.length - 1];
            return details;
        }
        return null;
    }

    /**
     * @return an array of {@code fontSize} and {@code lineHeight}, or {@code null} if invalid
     */
    private static String[] getFontSizeDetails(final String fontSize) {
        final int slash = fontSize.indexOf('/');
        final String actualFontSize = slash == -1 ? fontSize : fontSize.substring(0, slash);
        String actualLineHeight = slash == -1 ? "" : fontSize.substring(slash + 1);
        if (!isLength(actualFontSize)) {
            return null;
        }
        if (actualLineHeight.isEmpty()) {
            actualLineHeight = null;
        }
        else if (!isValidLineHeight(actualLineHeight)) {
            return null;
        }
        return new String[] {actualFontSize, actualLineHeight};
    }

    private static boolean isValidLineHeight(final String lineHeight) {
        return isLength(lineHeight) || "normal".equals(lineHeight);
    }

    private ComputedFont() {
    }

}