Source Viewer : WEB-INF/classes/org/apache/click/examples/page/SourceViewer.java
package org.apache.click.examples.page;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;
import org.apache.click.Page;
import org.apache.click.util.ClickUtils;
import org.apache.click.util.HtmlStringBuffer;
import org.apache.commons.lang.StringUtils;
/**
* Provides a Java source code, HTML and XML examples rendering page.
*/
public class SourceViewer extends BorderPage {
private static final long serialVersionUID = 1L;
private static final String[] JAVA_KEYWORDS = { "package", "import",
"class", "public", "protected", "private", "extends", "implements",
"return", "if", "while", "for", "do", "else", "try", "new", "void",
"catch", "throws", "throw", "static", "final", "break", "continue",
"super", "finally", "true", "false", "true;", "false;", "null",
"boolean", "int", "char", "long", "float", "double", "short",
"super", "this," };
private static final String[] JAVASCRIPT_KEYWORDS = { "break", "continue",
"do", "else", "for", "if", "return", "while", "auto", "case",
"char", "const", "default", "double", "enum", "extern", "float",
"goto", "int", "long", "register", "short", "signed", "sizeof",
"static", "struct", "switch", "typedef", "union", "unsigned",
"void", "volatile", "catch", "class", "delete", "false", "import",
"new", "operator", "private", "protected", "public", "this",
"throw", "true", "try", "debugger", "eval", "export", "function",
"get", "null", "set", "undefined", "var", "with", "Infinity",
"NaN" };
private static final String[] HTML_KEYWORDS = { "html", "head", "style",
"script", "title", "link", "body", "h1", "h2", "h3", "h4", "h5",
"h6", "p", "hr", "br", "span", "table", "tr", "th", "td", "a", "b",
"i", "u", "ul", "ol", "li", "form", "div", "input", "fieldset",
"pre", "tt", "ajax-response", "response", "%@", "%@taglib",
"jsp:include", "c:forEach", "c:choose", "c:when", "c:otherwise",
"fmt:formatNumber", "fmt:formatDate", "center" };
private static final String[] XML_KEYWORDS = { "click-app", "pages",
"page", "excludes", "headers", "header", "format", "mode", "type",
"filter-name", "filter-class", "filter-mapping", "filter",
"web-app", "display-name", "description", "servlet-mapping",
"servlet-name", "servlet-class", "init-param", "param-name",
"param-value", "servlet", "load-on-startup", "security-constraint",
"web-resource-collection", "auth-constraint", "role-name",
"login-config", "auth-method", "realm-name", "security-role",
"url-pattern", "welcome-file-list", "welcome-file", "Context",
"ResourceLink", "menu", "?xml", "controls", "control",
"listener-class", "listener", "beans", "bean", "context-param",
"context:component-scan", "property", "constructor-arg",
"list", "value", "ref", "beans:beans", "beans:bean", "http",
"intercept-url", "form-login", "logout", "beans:property",
"beans:list", "beans:ref", "authentication-provider"};
private static final String[] VELOCITY_KEYWORDS = { "#if", "#if(",
"#elseif", "#elseif(", "#else", "#else(", "#end", "#set", "#set(",
"#include", "#include(", "#parse", "#parse(", "#stop", "#macro",
"#macro(", "#foreach", "#foreach(", "##", "#*", "*#", "#" };
private boolean isJava = false;
private boolean isJavaScript = false;
private boolean javaMultilineComment = false;
private boolean isXml = false;
private boolean isHtml = false;
/**
* @see Page#onGet()
*/
@Override
public void onGet() {
HttpServletRequest request = getContext().getRequest();
String filename = request.getParameter("filename");
if (filename != null) {
loadFilename(filename);
getModel().put("title", "Source Viewer : " + filename);
} else {
addModel("error", "filename not defined");
}
}
private void loadFilename(String filename) {
ServletContext context = getContext().getServletContext();
// Orion server requires '/' prefix to find resources
String resourceFilename =
(filename.charAt(0) != '/') ? "/" + filename : filename;
InputStream in = null;
try {
in = context.getResourceAsStream(resourceFilename);
if (in == null && filename.endsWith(".htm")) {
resourceFilename =
resourceFilename.substring(0, resourceFilename.length() - 4)
+ ".jsp";
in = context.getResourceAsStream(resourceFilename);
}
if (in != null) {
loadResource(in, filename);
} else {
addModel("error", "File " + resourceFilename + " not found");
}
} catch (IOException e) {
addModel("error", "Could not read " + resourceFilename);
} finally {
ClickUtils.close(in);
}
}
private void loadResource(InputStream inputStream, String name)
throws IOException {
isJava = name.endsWith(".java");
isJavaScript = name.endsWith(".js");
isXml = name.endsWith(".xml");
isHtml = name.endsWith(".htm");
if (!isHtml) {
isHtml = name.endsWith(".html");
}
if (!isHtml) {
isHtml = name.endsWith(".vm");
}
if (!isHtml) {
isHtml = name.endsWith(".jsp");
}
BufferedReader reader =
new BufferedReader(new InputStreamReader(inputStream));
HtmlStringBuffer buffer = new HtmlStringBuffer();
// Filter out the license from displaying
skipLicense(reader, buffer);
String line = reader.readLine();
while (line != null) {
buffer.append(getEncodedLine(line));
buffer.append("\n");
line = reader.readLine();
}
addModel("source", buffer.toString());
addModel("name", name);
}
private void skipLicense(BufferedReader reader, HtmlStringBuffer buffer)
throws IOException {
// Mark reader so we can undo the read in case no license is found
reader.mark(500);
String line = reader.readLine();
if (line == null) {
return;
}
line = line.trim();
// Check for license start tokens
if (line.startsWith("/*") || line.startsWith("<!--")) {
line = reader.readLine();
while (line != null) {
line = line.trim();
// Check for license end tokens
if (line.startsWith("*/") || line.startsWith("-->")) {
// Move the reader past the end of license token
line = reader.readLine();
break;
}
line = reader.readLine();
}
} else {
// undo the read
reader.reset();
line = null;
}
// Gobble whitespace
while (line != null) {
if (!"".equals(line.trim())) {
// If the line is not empty, write it to buffer and break loop
buffer.append(getEncodedLine(line));
buffer.append("\n");
break;
}
line = reader.readLine();
}
}
private String getEncodedLine(String line) {
if (isJava) {
line = ClickUtils.escapeHtml(line);
// Check if line is part of multiline comment
if (isMultilineComment(line)) {
line = renderComment(line);
} else {
// Check if line contains singleline comment
String comment = "";
if (hasComment(line)) {
comment = getComment(line);
comment = renderComment(comment);
line = removeComment(line);
}
if (StringUtils.isNotBlank(line)) {
for (int i = 0; i < JAVA_KEYWORDS.length; i++) {
String keyword = JAVA_KEYWORDS[i];
line = renderJavaKeywords(line, keyword);
}
}
line = line + comment;
}
} else if (isJavaScript) {
line = ClickUtils.escapeHtml(line);
// Check if line is part of multiline comment
if (isMultilineComment(line)) {
line = renderComment(line);
} else {
// Check if line contains singleline comment
String comment = "";
if (hasComment(line)) {
comment = getComment(line);
comment = renderComment(comment);
line = removeComment(line);
}
if (StringUtils.isNotBlank(line)) {
for (int i = 0; i < JAVASCRIPT_KEYWORDS.length; i++) {
String keyword = JAVASCRIPT_KEYWORDS[i];
// Reuse renderJavaKeywords method
line = renderJavaKeywords(line, keyword);
}
}
line = line + comment;
}
} else if (isHtml) {
line = ClickUtils.escapeHtml(line);
for (int i = 0; i < HTML_KEYWORDS.length; i++) {
String keyword = HTML_KEYWORDS[i];
line = renderHtmlKeywords(line, keyword);
}
for (int i = 0; i < VELOCITY_KEYWORDS.length; i++) {
String keyword = VELOCITY_KEYWORDS[i];
line = renderVelocityKeywords(line, keyword);
}
String renderedDollar = "<font color=\"red\">$</font>";
line = StringUtils.replace(line, "$", renderedDollar);
} else if (isXml) {
line = ClickUtils.escapeHtml(line);
for (int i = 0; i < XML_KEYWORDS.length; i++) {
String keyword = XML_KEYWORDS[i];
line = renderXmlKeywords(line, keyword);
}
} else {
line = ClickUtils.escapeHtml(line);
}
return line;
}
private String renderJavaKeywords(String line, String token) {
String markupToken = renderJavaToken(token);
line = StringUtils.replace
(line, " " + token + " ", " " + markupToken + " ");
if (line.startsWith(token)) {
line = markupToken + line.substring(token.length());
}
if (line.endsWith(token)) {
line = line.substring(0, line.length() - token.length())
+ markupToken;
}
return line;
}
private boolean hasComment(String line) {
return line.indexOf("//") != -1;
}
private String removeComment(String line) {
int lineCommentStart = line.indexOf("//");
if (lineCommentStart != -1) {
line = line.substring(0, lineCommentStart);
}
return line;
}
private String getComment(String line) {
int lineCommentStart = line.indexOf("//");
if (lineCommentStart != -1) {
return line.substring(lineCommentStart);
}
return "";
}
private boolean isMultilineComment(String line) {
boolean isComment = false;
line = line.trim();
if (line.startsWith("/*")) {
isComment = true;
javaMultilineComment = true;
}
if (line.endsWith("*/")) {
isComment = true;
javaMultilineComment = false;
}
if (javaMultilineComment && line.startsWith("*")) {
isComment = true;
}
return isComment;
}
private String renderVelocityKeywords(String line, String token) {
String markupToken = renderVelocityToken(token);
line = StringUtils.replace
(line, " " + token + " ", " " + markupToken + " ");
if (line.startsWith(token)) {
line = markupToken + line.substring(token.length());
}
if (line.endsWith(token)) {
line = line.substring(0, line.length() - token.length())
+ markupToken;
}
return line;
}
private String renderHtmlKeywords(String line, String token) {
String markupToken = "<" + token + ">";
String renderedToken = "<" + renderHtmlToken(token) + ">";
line = StringUtils.replace(line, markupToken, renderedToken);
markupToken = "<" + token + "/>";
renderedToken = "<" + renderHtmlToken(token) + "/>";
line = StringUtils.replace(line, markupToken, renderedToken);
markupToken = "</" + token + ">";
renderedToken = "</" + renderHtmlToken(token) + ">";
line = StringUtils.replace(line, markupToken, renderedToken);
markupToken = "<" + token + " ";
renderedToken = "<" + renderHtmlToken(token) + " ";
line = StringUtils.replace(line, markupToken, renderedToken);
return line;
}
private String renderXmlKeywords(String line, String token) {
String markupToken = "<" + token + ">";
String renderedToken = "<" + renderXmlToken(token) + ">";
line = StringUtils.replace(line, markupToken, renderedToken);
markupToken = "<" + token + "/>";
renderedToken = "<" + renderXmlToken(token) + "/>";
line = StringUtils.replace(line, markupToken, renderedToken);
markupToken = "</" + token + ">";
renderedToken = "</" + renderXmlToken(token) + ">";
line = StringUtils.replace(line, markupToken, renderedToken);
markupToken = "<" + token + " ";
renderedToken = "<" + renderXmlToken(token) + " ";
line = StringUtils.replace(line, markupToken, renderedToken);
return line;
}
private String renderHtmlToken(String token) {
return "<font color=\"#00029F\">" + token + "</font>";
}
private String renderXmlToken(String token) {
return "<font color=\"#00029F\">" + token + "</font>";
}
private String renderVelocityToken(String token) {
return "<font color=\"red\">" + token + "</font>";
}
private String renderJavaToken(String token) {
return "<font color=\"#7f0055\"><b>" + token + "</b></font>";
}
private String renderComment(String comment) {
return "<font color=\"#3F7F5F\">" + comment + "</font>";
}
}
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