com.njzxw.compress_maven_plugin.html.HtmlCompressor Maven / Gradle / Ivy

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package com.njzxw.compress_maven_plugin.html;

import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class HtmlCompressor {
	private static String tempPreBlock = "%%%HTMLCOMPRESS~PRE&&&";
	private static String tempTextAreaBlock = "%%%HTMLCOMPRESS~TEXTAREA&&&";
	private static String tempScriptBlock = "%%%HTMLCOMPRESS~SCRIPT&&&";
	private static String tempStyleBlock = "%%%HTMLCOMPRESS~STYLE&&&";
	private static String tempJspBlock = "%%%HTMLCOMPRESS~JSP&&&";

	private static Pattern commentPattern = Pattern.compile(
			"", Pattern.DOTALL | Pattern.CASE_INSENSITIVE
					| Pattern.MULTILINE);
	private static Pattern itsPattern = Pattern.compile(">\\s+?<",
			Pattern.DOTALL | Pattern.CASE_INSENSITIVE | Pattern.MULTILINE);
	private static Pattern prePattern = Pattern.compile("]*?>.*?

",
			Pattern.DOTALL | Pattern.CASE_INSENSITIVE | Pattern.MULTILINE);
	private static Pattern taPattern = Pattern.compile(
			"]*?>.*?", Pattern.DOTALL
					| Pattern.CASE_INSENSITIVE | Pattern.MULTILINE);
	private static Pattern jspPattern = Pattern.compile(
			"<%([^-@][\\w\\W]*?)%>", Pattern.DOTALL | Pattern.CASE_INSENSITIVE
					| Pattern.MULTILINE);
	// 
	private static Pattern scriptPattern = Pattern
			.compile(
					"(?:|",
					Pattern.DOTALL | Pattern.CASE_INSENSITIVE
							| Pattern.MULTILINE);
	private static Pattern stylePattern = Pattern.compile(
			"()]*?>(.+)", Pattern.DOTALL
					| Pattern.CASE_INSENSITIVE | Pattern.MULTILINE);

	// 单行注释，
	private static Pattern signleCommentPattern = Pattern.compile("//.*");
	// 字符串匹配
	private static Pattern stringPattern = Pattern
			.compile("(\"[^\"\\n]*?\"|'[^'\\n]*?')");
	// trim去空格和换行符
	private static Pattern trimPattern = Pattern.compile("\\n\\s*",
			Pattern.MULTILINE);
	private static Pattern trimPattern2 = Pattern.compile("\\s*\\r",
			Pattern.MULTILINE);
	// 多行注释
	private static Pattern multiCommentPattern = Pattern.compile("/\\*.*?\\*/",
			Pattern.DOTALL | Pattern.CASE_INSENSITIVE | Pattern.MULTILINE);

	private static String tempSingleCommentBlock = "%%%HTMLCOMPRESS~SINGLECOMMENT&&&"; // //占位符
	private static String tempMulitCommentBlock1 = "%%%HTMLCOMPRESS~MULITCOMMENT1&&&"; // /*占位符
	private static String tempMulitCommentBlock2 = "%%%HTMLCOMPRESS~MULITCOMMENT2&&&"; // */占位符

	public static String compress(String html) throws Exception {
		if (html == null || html.length() == 0) {
			return html;
		}

		List preBlocks = new ArrayList();
		List taBlocks = new ArrayList();
		List scriptBlocks = new ArrayList();
		List styleBlocks = new ArrayList();
		List jspBlocks = new ArrayList();

		String result = html;

		// preserve inline java code
		Matcher jspMatcher = jspPattern.matcher(result);
		while (jspMatcher.find()) {
			jspBlocks.add(jspMatcher.group(0));
		}
		result = jspMatcher.replaceAll(tempJspBlock);

		// preserve PRE tags
		Matcher preMatcher = prePattern.matcher(result);
		while (preMatcher.find()) {
			preBlocks.add(preMatcher.group(0));
		}
		result = preMatcher.replaceAll(tempPreBlock);

		// preserve TEXTAREA tags
		Matcher taMatcher = taPattern.matcher(result);
		while (taMatcher.find()) {
			taBlocks.add(taMatcher.group(0));
		}
		result = taMatcher.replaceAll(tempTextAreaBlock);

		// preserve SCRIPT tags
		Matcher scriptMatcher = scriptPattern.matcher(result);
		while (scriptMatcher.find()) {
			scriptBlocks.add(scriptMatcher.group(0));
		}
		result = scriptMatcher.replaceAll(tempScriptBlock);

		// don't process inline css
		Matcher styleMatcher = stylePattern.matcher(result);
		while (styleMatcher.find()) {
			styleBlocks.add(styleMatcher.group(0));
		}
		result = styleMatcher.replaceAll(tempStyleBlock);

		// process pure html
		result = processHtml(result);

		// process preserved blocks
		result = processPreBlocks(result, preBlocks);
		result = processTextareaBlocks(result, taBlocks);
		result = processScriptBlocks(result, scriptBlocks);
		result = processStyleBlocks(result, styleBlocks);
		result = processJspBlocks(result, jspBlocks);

		preBlocks = taBlocks = scriptBlocks = styleBlocks = jspBlocks = null;

		return result.trim();
	}

	private static String processHtml(String html) {
		String result = html;

		// remove comments
		// if(removeComments) {
		result = commentPattern.matcher(result).replaceAll("");
		// }

		// remove inter-tag spaces
		// if(removeIntertagSpaces) {
		result = itsPattern.matcher(result).replaceAll("><");
		// }

		// remove multi whitespace characters
		// if(removeMultiSpaces) {
		result = result.replaceAll("\\s{2,}", " ");
		// }

		return result;
	}

	private static String processJspBlocks(String html, List blocks) {
		String result = html;
		for (int i = 0; i < blocks.size(); i++) {
			blocks.set(i, compressJsp(blocks.get(i)));
		}
		// put preserved blocks back
		while (result.contains(tempJspBlock)) {
			result = result.replaceFirst(tempJspBlock,
					Matcher.quoteReplacement(blocks.remove(0)));
		}

		return result;
	}

	private static String processPreBlocks(String html, List blocks)
			throws Exception {
		String result = html;

		// put preserved blocks back
		while (result.contains(tempPreBlock)) {
			result = result.replaceFirst(tempPreBlock,
					Matcher.quoteReplacement(blocks.remove(0)));
		}

		return result;
	}

	private static String processTextareaBlocks(String html, List blocks)
			throws Exception {
		String result = html;

		// put preserved blocks back
		while (result.contains(tempTextAreaBlock)) {
			result = result.replaceFirst(tempTextAreaBlock,
					Matcher.quoteReplacement(blocks.remove(0)));
		}

		return result;
	}

	private static String processScriptBlocks(String html, List blocks)
			throws Exception {
		String result = html;

		// if(compressJavaScript) {
		for (int i = 0; i < blocks.size(); i++) {
			blocks.set(i, compressJavaScript(blocks.get(i)));
		}
		// }

		// put preserved blocks back
		while (result.contains(tempScriptBlock)) {
			result = result.replaceFirst(tempScriptBlock,
					Matcher.quoteReplacement(blocks.remove(0)));
		}

		return result;
	}

	private static String processStyleBlocks(String html, List blocks)
			throws Exception {
		String result = html;

		// if(compressCss) {
		for (int i = 0; i < blocks.size(); i++) {
			blocks.set(i, compressCssStyles(blocks.get(i)));
		}
		// }

		// put preserved blocks back
		while (result.contains(tempStyleBlock)) {
			result = result.replaceFirst(tempStyleBlock,
					Matcher.quoteReplacement(blocks.remove(0)));
		}

		return result;
	}

	private static String compressJsp(String source) {
		// check if block is not empty
		Matcher jspMatcher = jspPattern.matcher(source);
		if (jspMatcher.find()) {
			String result = compressJspJs(jspMatcher.group(1));
			return (new StringBuilder(source.substring(0, jspMatcher.start(1)))
					.append(result).append(source.substring(jspMatcher.end(1))))
					.toString();
		} else {
			return source;
		}
	}

	private static String compressJavaScript(String source) {
		// check if block is not empty
		Matcher scriptMatcher = scriptPattern.matcher(source);
		if (scriptMatcher.find()) {
			String result = compressJspJs(scriptMatcher.group(1));
			return (new StringBuilder(source.substring(0,
					scriptMatcher.start(1))).append(result).append(source
					.substring(scriptMatcher.end(1)))).toString();
		} else {
			return source;
		}
	}

	private static String compressCssStyles(String source) {
		// check if block is not empty
		Matcher styleMatcher = stylePattern.matcher(source);
		if (styleMatcher.find()) {
			// 去掉注释，换行
			String result = multiCommentPattern.matcher(styleMatcher.group(1))
					.replaceAll("");
			result = trimPattern.matcher(result).replaceAll("");
			result = trimPattern2.matcher(result).replaceAll("");
			return (new StringBuilder(
					source.substring(0, styleMatcher.start(1))).append(result)
					.append(source.substring(styleMatcher.end(1)))).toString();
		} else {
			return source;
		}
	}

	private static String compressJspJs(String source) {
		String result = source;
		// 因注释符合有可能出现在字符串中，所以要先把字符串中的特殊符好去掉
		Matcher stringMatcher = stringPattern.matcher(result);
		while (stringMatcher.find()) {
			String tmpStr = stringMatcher.group(0);

			if (tmpStr.indexOf("//") != -1 || tmpStr.indexOf("/*") != -1
					|| tmpStr.indexOf("*/") != -1) {
				String blockStr = tmpStr
						.replaceAll("//", tempSingleCommentBlock)
						.replaceAll("/\\*", tempMulitCommentBlock1)
						.replaceAll("\\*/", tempMulitCommentBlock2);
				result = result.replace(tmpStr, blockStr);
			}
		}
		// 去掉注释
		result = signleCommentPattern.matcher(result).replaceAll("");
		result = multiCommentPattern.matcher(result).replaceAll("");
		result = trimPattern2.matcher(result).replaceAll("");
		result = trimPattern.matcher(result).replaceAll(" ");
		// 恢复替换掉的字符串
		result = result.replaceAll(tempSingleCommentBlock, "//")
				.replaceAll(tempMulitCommentBlock1, "/*")
				.replaceAll(tempMulitCommentBlock2, "*/");

		return result;
	}

	public static void main(String[] args) {
		String spath = "C:\\Users\\eliay\\Desktop\\java\\extract.jsp";
		BufferedReader br = null;
		InputStreamReader fr = null;

		try {
			fr = new InputStreamReader(new FileInputStream(spath), "utf-8");
			br = new BufferedReader(fr);
			StringBuffer str = new StringBuffer();
			String line = "";
			while ((line = br.readLine()) != null) {
				str.append(line);
			}
			String result = HtmlCompressor.compress(str.toString());
			System.out.println(result);
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
}