package com.whyc.util;
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import java.io.File;
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public class HtmlUtils {
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public static void main(String[] args) throws Exception {
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String txt = IoUtils.readTxtFile(new File("/Users/roseboy/work-yiyon/易用框架/yiyon-framework/jeee-importer/src/main/resources/templates/importer-upload-form-pro.ftl"));
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long t1 = System.currentTimeMillis();
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txt = removeComments(txt);
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txt = removeBlank(txt);
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//txt = removeBr(txt);
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long t2 = System.currentTimeMillis();
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System.out.println(txt);
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//System.out.println(t2 - t1);
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}
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/**
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* 去除代码中的注释
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*
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* @param code 代码
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* @return 代码
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*/
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public static String removeBlank(String code) {
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StringBuilder result = new StringBuilder();
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int quot = 0;//单引号
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int quots = 0;//双引号
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boolean inScript = false;//进入script标签
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boolean inStyle = false;//进入style标签
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boolean inTextArea = false;//进入textaera标签
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char[] chars = code.replace("\r\n", "\n").toCharArray();
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for (int i = 0; i < chars.length; i++) {
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if (inStyle) {
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if (isElementEnd(i, chars, "</style>")) {
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inStyle = false;
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}
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if (chars[i] != ' ' && chars[i] != '\n') {
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result.append(chars[i]);
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}
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continue;
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} else if (inScript) {
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if (isElementEnd(i, chars, "</script>")) {
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inScript = false;
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}
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if (chars[i] != '\n') {
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result.append(chars[i]);
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}
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continue;
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} else if (inTextArea) {
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if (isElementEnd(i, chars, "</textarea>")) {
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inTextArea = false;
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}
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result.append(chars[i]);
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continue;
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}
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//判断是不是注释开始
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if (chars[i] == '"' && chars[i - 1] != '\\' && quot % 2 == 0) {//不是转义，不在单引号内的双引号
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quots++;
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result.append(chars[i]);
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} else if (chars[i] == '\'' && chars[i - 1] != '\\' && quots % 2 == 0) {//不是转义，不在双引号内的单引号
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quot++;
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result.append(chars[i]);
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} else if (quot % 2 == 0 && quots % 2 == 0) {//不在引号内
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// <script
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if (isElementBegin(i, chars, "<script>")) {
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i = append(i, chars, result, '>');
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inScript = true;
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}
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// <style
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else if (isElementBegin(i, chars, "<style>")) {
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i = append(i, chars, result, '>');
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inStyle = true;
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}
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// <textarea
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else if (isElementBegin(i, chars, "<textarea>")) {
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i = append(i, chars, result, '>');
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inTextArea = true;
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}
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//html标签内
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else if (chars[i] == '<') {
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i = append(i, chars, result, '>');
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} else {
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result.append(chars[i]);
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}
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} else {
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result.append(chars[i]);
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}
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}
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return result.toString();
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}
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/**
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* 去除代码中的注释
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*
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* @param code 代码
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* @return 代码
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*/
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public static String removeComments(String code) {
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StringBuilder result = new StringBuilder();
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int quot = 0;//单引号
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int quots = 0;//双引号
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boolean jumpToNextLine = false;//跳过当前行
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boolean jumpToComment1 = false;//跳到注释类型1结束 /* xxx */
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boolean jumpToComment2 = false;//跳到注释类型2结束 <!-- xxx -->
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char[] chars = code.replace("\r\n", "\n").toCharArray();
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for (int i = 0; i < chars.length; i++) {
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//跳过注释中的内容
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if (jumpToNextLine) {
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if (chars[i] == '\n') {
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jumpToNextLine = false;
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result.append(chars[i]);
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}
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continue;
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} else if (jumpToComment1) {
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if (isElementEnd(i, chars, "*/")) {
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jumpToComment1 = false;
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}
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continue;
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} else if (jumpToComment2) {
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if (isElementEnd(i, chars, "-->")) {
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jumpToComment2 = false;
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}
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continue;
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}
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//判断是不是注释开始
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if (chars[i] == '"' && chars[i - 1] != '\\' && quot % 2 == 0) {//不是转义，不在单引号内的双引号
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quots++;
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result.append(chars[i]);
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} else if (chars[i] == '\'' && chars[i - 1] != '\\' && quots % 2 == 0) {//不是转义，不在双引号内的单引号
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quot++;
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result.append(chars[i]);
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} else if (quot % 2 == 0 && quots % 2 == 0) {//不在引号内
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//双斜杠注释
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if (isElementBegin(i, chars, "// ")) {
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jumpToNextLine = true;
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}
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// /*注释*/
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else if (isElementBegin(i, chars, "/* ")) {
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jumpToComment1 = true;
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}
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// <!--注释-->
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else if (isElementBegin(i, chars, "<!-- ")) {
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jumpToComment2 = true;
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} else {
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result.append(chars[i]);
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}
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} else {
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result.append(chars[i]);
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}
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}
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return result.toString();
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}
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private static boolean isElementBegin(int index, char[] chars, String element) {
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element = element.toLowerCase();
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for (int i = 0; i < element.length() - 1; i++) {
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if (Character.toLowerCase(chars[index + i]) != element.charAt(i)) {
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return false;
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}
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}
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if (element.charAt(element.length() - 1) == ' ' || chars[index + element.length() - 1] == ' '
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|| chars[index + element.length() - 1] == element.charAt(element.length() - 1)) {
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return true;
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}
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return false;
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}
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private static boolean isElementEnd(int index, char[] chars, String element) {
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element = element.toLowerCase();
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for (int i = index; i > index - element.length(); i--) {
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if (Character.toLowerCase(chars[i]) != element.charAt(element.length() - index + i - 1)) {
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return false;
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}
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}
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return true;
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}
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private static int append(int i, char[] chars, StringBuilder result, char endChar) {
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while (chars[i] != endChar) {
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chars[i] = chars[i] == '\n' ? ' ' : chars[i];
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if (chars[i] == ' ' && chars[i - 1] == ' ') {
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i++;
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continue;
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}
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result.append(chars[i++]);
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}
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result.append(chars[i]);
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return i;
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}
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/**
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* 移除空白行和行前空格
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*
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* @param code 代码
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* @return 代码
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*/
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public static String removeBlankLine(String code) {
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StringBuilder result = new StringBuilder();
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String[] lines = code.split("\n");
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for (String line : lines) {
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line = line.trim();
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if (line.length() == 0) {
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continue;
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}
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result.append(line).append("\n");
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}
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return result.toString();
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}
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}
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