mfi.staticresources.ProcessResources.java Source code

Introduction

Here is the source code for mfi.staticresources.ProcessResources.java

Source

package mfi.staticresources;

import org.apache.commons.codec.binary.Base64;
import org.apache.commons.lang3.StringUtils;
import org.codehaus.plexus.util.FileUtils;

public class ProcessResources {

    public String processCSS(String content) {

        content = base64svg(content);
        content = minifyCSS(content);

        return content;
    }

    public String processJS(String content) {

        content = minifyJS(content);

        return content;
    }

    private String minifyCSS(String content) {

        content = deleteBetween(content, "/*", "*/", "license-attribution");

        content = replace(content, "\t", "");
        content = replace(content, "\r", "");
        content = replace(content, "\n\n", "\n");
        content = trimAround(content, "\n");
        content = trimAround(content, "{");
        content = trimAround(content, ":");
        content = replace(content, ",\n", ",");
        content = trimAround(content, ",");
        content = replace(content, "{\n", "{");
        content = replace(content, ";\n", ";");
        content = replace(content, "\n}", "}");
        content = replace(content, ";}", "}");
        // hacks
        content = StringUtils.replace(content, "@charset \"UTF-8\";", "@charset \"UTF-8\";\n");

        return content;
    }

    private String minifyJS(String content) {

        content = deleteBetween(content, "// ", "\n", null);
        content = deleteBetween(content, "/*", " */", null);

        content = replace(content, "\t", "");
        content = replace(content, "\r", "");
        content = replace(content, "\n\n", "\n");
        content = trimAround(content, "\n");
        content = replace(content, "{\n", "{");
        content = replace(content, "\n}", "}");
        content = replace(content, ";\n", ";");
        content = replace(content, "(\n", "(");
        content = replace(content, "\n(", "(");
        content = replace(content, ")\n", ")");
        content = replace(content, "\n)", ")");
        content = replace(content, ",\n", ",");
        content = replace(content, "\n.", ".");
        content = trimAround(content, "=");
        content = trimAround(content, ">");
        content = trimAround(content, "<");
        content = trimAround(content, "+");
        content = trimAround(content, "-");
        content = trimAround(content, "}");
        content = trimAround(content, "{");
        content = trimAround(content, "(");
        content = trimAround(content, ")");
        content = trimAround(content, ",");
        content = trimAround(content, "+");
        content = trimAround(content, "||");
        content = trimAround(content, "&&");

        return content;
    }

    private String trimAround(String content, String search) {

        content = replace(content, " " + search, search);
        content = replace(content, search + " ", search);

        return content;
    }

    private String replace(String content, String search, String replacement) {

        String compare;
        do {
            compare = content;
            content = StringUtils.replace(content, search, replacement);
        } while (!compare.equals(content));

        return content;
    }

    private String base64svg(String content) {

        content = replace(content, "image/svg+xml;charset=utf8,", "image/svg+xml;charset=utf8;base64,");
        try {
            boolean again = true;
            while (again) {
                String svg = StringUtils.substringBetween(content, "<svg", "</svg>");
                if (StringUtils.isBlank(svg)) {
                    again = false;
                } else {
                    svg = "<svg" + svg + "</svg>";
                    byte[] svgBytes = svg.getBytes("UTF-8");
                    String substringase64 = new String(Base64.encodeBase64(svgBytes), "UTF-8");
                    content = StringUtils.replace(content, svg, substringase64);
                }
            }
        } catch (Exception e) {
            throw new RuntimeException(e);
        }

        return content;
    }

    private String deleteBetween(String content, String start, String end, String exclusionContent) {

        try {
            String[] subs = StringUtils.substringsBetween(content, start, end);
            if (subs == null || subs.length == 0) {
                // noop
            } else {
                for (String sub : subs) {
                    if (StringUtils.isNotBlank(exclusionContent)
                            && StringUtils.containsIgnoreCase(sub, exclusionContent)) {
                        // noop
                    } else {
                        sub = start + sub + end;
                        content = StringUtils.replace(content, sub, "");
                    }
                }
            }
        } catch (Exception e) {
            throw new RuntimeException(e);
        }

        return content;
    }

    public static void main(String[] args) throws Exception {
        String string = FileUtils
                .fileRead("/Users/mfi/Documents/Programmierung/git/FileJuggler/FileJuggler/WebContent/style.css");
        string = (new ProcessResources()).processCSS(string);
        System.out.println(string);
    }

}