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    • guru.nidi.graphviz.engine.Format Maven / Gradle / Ivy

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    /*
 * Copyright © 2015 Stefan Niederhauser ([email protected])
 *
 * 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
 *
 *     http://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 guru.nidi.graphviz.engine;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public enum Format {
    PNG("svg", "png", true, true) {
        @Override
        String preProcess(String src) {
            return encodeXml(super.preProcess(src));
        }

        @Override
        EngineResult postProcess(Graphviz graphviz, EngineResult result) {
            return result.mapString(s -> postProcessSvg(graphviz, s, true));
        }
    },

    SVG("svg", "svg", false, true) {
        @Override
        String preProcess(String src) {
            return encodeXml(super.preProcess(src));
        }

        @Override
        EngineResult postProcess(Graphviz graphviz, EngineResult result) {
            return result.mapString(s -> postProcessSvg(graphviz, s, true));
        }
    },

    SVG_STANDALONE("svg", "svg", false, true) {
        @Override
        String preProcess(String src) {
            return encodeXml(super.preProcess(src));
        }

        @Override
        EngineResult postProcess(Graphviz graphviz, EngineResult result) {
            return result.mapString(s -> postProcessSvg(graphviz, s, false));
        }
    },
    DOT("dot", "dot", false, false),
    XDOT("xdot", "xdot", false, false),
    PLAIN("plain", "txt", false, false),
    PLAIN_EXT("plain-ext", "txt", false, false),
    PS("ps", "ps", false, false),
    PS2("ps2", "ps", false, false),
    JSON("json", "json", false, false),
    JSON0("json0", "json", false, false);

    private static final Logger LOG = LoggerFactory.getLogger(Format.class);
    private static final Pattern FONT_PATTERN = Pattern.compile("font-size=\"(.*?)\"");
    private static final Pattern SVG_PATTERN = Pattern.compile(
            "\\d+)(?p[tx])\" height=\"(?\\d+)p[tx]\""
                    + "(?.*?>\\R[0-9.]+) (?[0-9.]+)\\)",
            Pattern.DOTALL);

    final String vizName;
    public final String fileExtension;
    final boolean image;
    final boolean svg;

    Format(String vizName, String fileExtension, boolean image, boolean svg) {
        this.vizName = vizName;
        this.fileExtension = fileExtension;
        this.image = image;
        this.svg = svg;
    }

    String preProcess(String src) {
        return replaceSubSpaces(src);
    }

    EngineResult postProcess(Graphviz graphviz, EngineResult result) {
        return result;
    }

    private static String replaceSubSpaces(String src) {
        final char[] chars = src.toCharArray();
        for (int i = 0; i < chars.length; i++) {
            if (chars[i] < ' ' && chars[i] != '\t' && chars[i] != '\r' && chars[i] != '\n') {
                chars[i] = ' ';
            }
        }
        return new String(chars);
    }

    private static String encodeXml(String src) {
        return src.replace("&", "&");
    }

    private static String postProcessSvg(Graphviz graphviz, String result, boolean prefix) {
        final String unprefixed = prefix ? withoutPrefix(result) : result;
        final String pixelSized = pointsToPixels(unprefixed, graphviz.dpi(),
                graphviz.width, graphviz.height, graphviz.scale);
        return graphviz.fontAdjust == 1 ? pixelSized : fontAdjusted(pixelSized, graphviz.fontAdjust);
    }

    private static String withoutPrefix(String svg) {
        final int pos = svg.indexOf(" 0 && height > 0) {
            w = width;
            h = height;
        } else if (width > 0) {
            h *= width / w;
            w = width;
        } else if (height > 0) {
            w *= height / h;
            h = height;
        }
        return "width=\"" + Math.round(w * scale) + "px\" height=\"" + Math.round(h * scale) + "px\"";
    }

    private static String svgScale(Matcher m, double dpi) {
        final double pixelScale = m.group("unit").equals("px") ? 1 : Math.round(10000 * dpi / 72) / 10000d;
        final double scaleX = Double.parseDouble(m.group("scaleX")) / pixelScale;
        final double scaleY = Double.parseDouble(m.group("scaleY")) / pixelScale;
        return "transform=\"scale(" + scaleX + " " + scaleY + ")";
    }

    private static String fontAdjusted(String svg, double fontAdjust) {
        final Matcher m = FONT_PATTERN.matcher(svg);
        final StringBuffer s = new StringBuffer();
        while (m.find()) {
            String rep;
            try {
                rep = "font-size=\"" + Double.parseDouble(m.group(1)) * fontAdjust + "\"";
            } catch (NumberFormatException e) {
                rep = m.group();
            }
            m.appendReplacement(s, rep);
        }
        m.appendTail(s);
        return s.toString();
    }
}




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