@Override
public boolean render(InternalContextAdapter context, Writer writer, Node node) throws IOException, ResourceNotFoundException, ParseErrorException, MethodInvocationException {
    String value = (String) node.jjtGetChild(0).value(context);
    String character = (String) node.jjtGetChild(1).value(context);
    int len = value.length();
    StringBuilder sb = new StringBuilder(len);
    sb.append(value.charAt(0));
    for (int i = 1; i < len; i++) {
        char c = value.charAt(i);
        if (Character.isUpperCase(c)) {
            sb.append(character).append(Character.toLowerCase(c));
        } else {
            sb.append(c);
        }
    }
    writer.write(sb.toString());
    return true;
}
 

public VelocityTemplateParser(String templateString) throws ParseErrorException {
    VelocityEngine engine = new VelocityEngine();
    engine.setProperty(RuntimeConstants.RUNTIME_LOG_LOGSYSTEM_CLASS, "org.apache.velocity.runtime.log.Log4JLogChute");
    engine.setProperty("runtime.log.logsystem.log4j.logger", LOG.getName());
    engine.setProperty(Velocity.RESOURCE_LOADER, "string");
    engine.addProperty("string.resource.loader.class", StringResourceLoader.class.getName());
    engine.addProperty("string.resource.loader.repository.static", "false");
    engine.addProperty("runtime.references.strict", "true");
    engine.init();
    StringResourceRepository resourceRepository = (StringResourceRepository) engine.getApplicationAttribute(StringResourceLoader.REPOSITORY_NAME_DEFAULT);
    resourceRepository.putStringResource(TEMPLATE_NAME, templateString);
    template = engine.getTemplate(TEMPLATE_NAME);
    ASTprocess data = (ASTprocess) template.getData();
    visitor = new ParserNodeVisitor();
    data.jjtAccept(visitor, null);
}
 

public String evaluate(Map<String, Object> context, TemplatePack templatePack, Template template) throws IOException {
    StringWriter sw = new StringWriter();
    try {
        engine.evaluate(new VelocityContext(context), sw, template.getName(), template.getTemplate());
        return sw.toString();
    } catch (ParseErrorException parseException) {
        handleStopFileGeneration(parseException);
        log.error("In " + templatePack.getName() + ":" + template.getName() + " template, parse exception " + parseException.getMessage(),
                parseException.getCause());
        displayLinesInError(parseException, templatePack, template);
        throw new IllegalStateException();
    } catch (MethodInvocationException mie) {
        handleStopFileGeneration(mie);
        log.error("In " + templatePack.getName() + ":" + mie.getTemplateName() + " method [" + mie.getMethodName() + "] has not been set", mie.getCause());
        displayLinesInError(mie, templatePack, template);
        throw mie;
    } finally {
        closeQuietly(sw);
    }
}
 

public boolean render(InternalContextAdapter context, Writer writer, Node node) 
  		throws IOException, ResourceNotFoundException, ParseErrorException, MethodInvocationException {
  	
  	//render content
  	StringWriter content = new StringWriter();
node.jjtGetChild(0).render(context, content);

//compress
try {
	writer.write(htmlCompressor.compress(content.toString()));
} catch (Exception e) {
	writer.write(content.toString());
	String msg = "Failed to compress content: "+content.toString();
          log.error(msg, e);
          throw new RuntimeException(msg, e);
          
}
return true;
  	
  }
 

public boolean render(InternalContextAdapter context, Writer writer, Node node) 
  		throws IOException, ResourceNotFoundException, ParseErrorException, MethodInvocationException {
  	
  	//render content
  	StringWriter content = new StringWriter();
node.jjtGetChild(0).render(context, content);

//compress
try {
	writer.write(xmlCompressor.compress(content.toString()));
} catch (Exception e) {
	writer.write(content.toString());
	String msg = "Failed to compress content: "+content.toString();
          log.error(msg, e);
          throw new RuntimeException(msg, e);
          
}
return true;
  	
  }
 

/**
 * Returns a markdown rendering of rule documentation for the given rule information object with
 * the given rule name.
 */
public String render(String ruleName, RuleInfo ruleInfo) throws IOException {
  VelocityContext context = new VelocityContext();
  context.put("util", new MarkdownUtil());
  context.put("ruleName", ruleName);
  context.put("ruleInfo", ruleInfo);

  StringWriter stringWriter = new StringWriter();
  Reader reader = readerFromPath(ruleTemplateFilename);
  try {
    velocityEngine.evaluate(context, stringWriter, ruleTemplateFilename, reader);
  } catch (ResourceNotFoundException | ParseErrorException | MethodInvocationException e) {
    throw new IOException(e);
  }
  return stringWriter.toString();
}
 

/**
 * Returns a markdown rendering of provider documentation for the given provider information
 * object with the given name.
 */
public String render(String providerName, ProviderInfo providerInfo) throws IOException {
  VelocityContext context = new VelocityContext();
  context.put("util", new MarkdownUtil());
  context.put("providerName", providerName);
  context.put("providerInfo", providerInfo);

  StringWriter stringWriter = new StringWriter();
  Reader reader = readerFromPath(providerTemplateFilename);
  try {
    velocityEngine.evaluate(context, stringWriter, providerTemplateFilename, reader);
  } catch (ResourceNotFoundException | ParseErrorException | MethodInvocationException e) {
    throw new IOException(e);
  }
  return stringWriter.toString();
}
 

/**
 * Returns a markdown rendering of aspect documentation for the given aspect information object
 * with the given aspect name.
 */
public String render(String aspectName, AspectInfo aspectInfo) throws IOException {
  VelocityContext context = new VelocityContext();
  context.put("util", new MarkdownUtil());
  context.put("aspectName", aspectName);
  context.put("aspectInfo", aspectInfo);

  StringWriter stringWriter = new StringWriter();
  Reader reader = readerFromPath(aspectTemplateFilename);
  try {
    velocityEngine.evaluate(context, stringWriter, aspectTemplateFilename, reader);
  } catch (ResourceNotFoundException | ParseErrorException | MethodInvocationException e) {
    throw new IOException(e);
  }
  return stringWriter.toString();
}
 

/**
 * Renders the template and writes the output to the given file.
 *
 * Strips all trailing whitespace before writing to file.
 */
public void write(File outputFile) throws IOException {
  StringWriter stringWriter = new StringWriter();
  try {
    engine.mergeTemplate(template, "UTF-8", context, stringWriter);
  } catch (ResourceNotFoundException|ParseErrorException|MethodInvocationException e) {
    throw new IOException(e);
  }
  stringWriter.close();

  String[] lines = stringWriter.toString().split(System.getProperty("line.separator"));
  try (Writer fileWriter = Files.newBufferedWriter(outputFile.toPath(), UTF_8)) {
    for (String line : lines) {
      // Strip trailing whitespace then append newline before writing to file.
      fileWriter.write(line.replaceFirst("\\s+$", "") + "\n");
    }
  }
}
 

/**
 * Test method for {@link org.apache.velocity.tools.view.jsp.jspimpl.JspUtils#executeTag(org.apache.velocity.context.InternalContextAdapter, org.apache.velocity.runtime.parser.node.Node, javax.servlet.jsp.PageContext, javax.servlet.jsp.tagext.Tag)}.
 * @throws JspException If something goes wrong.
 * @throws IOException If something goes wrong.
 * @throws ParseErrorException If something goes wrong.
 * @throws ResourceNotFoundException If something goes wrong.
 * @throws MethodInvocationException If something goes wrong.
 */
@Test
public void testExecuteTag() throws JspException, MethodInvocationException, ResourceNotFoundException, ParseErrorException, IOException
{
    InternalContextAdapter context = createMock(InternalContextAdapter.class);
    Node node = createMock(Node.class);
    PageContext pageContext = createMock(PageContext.class);
    BodyTag tag = createMock(BodyTag.class);
    ASTBlock block = createMock(ASTBlock.class);
    JspWriter writer = createMock(JspWriter.class);

    expect(tag.doStartTag()).andReturn(BodyTag.EVAL_BODY_BUFFERED);
    tag.setBodyContent(isA(VelocityBodyContent.class));
    tag.doInitBody();
    expect(node.jjtGetChild(1)).andReturn(block);
    expect(tag.doAfterBody()).andReturn(BodyTag.SKIP_BODY);
    expect(tag.doEndTag()).andReturn(BodyTag.EVAL_PAGE);
    expect(pageContext.getOut()).andReturn(writer);
    expect(block.render(eq(context), isA(StringWriter.class))).andReturn(true);

    replay(context, node, pageContext, block, tag, writer);
    JspUtils.executeTag(context, node, pageContext, tag);
    verify(context, node, pageContext, block, tag, writer);
}
 

/**
 *  Merges a template and puts the rendered stream into the writer
 *
 *  @param templateName name of template to be used in merge
 *  @param encoding encoding used in template
 *  @param context  filled context to be used in merge
 *  @param  writer  writer to write template into
 *
 *  @return true if successful, false otherwise.  Errors
 *           logged to velocity log
 *
 * @throws ParseErrorException The template could not be parsed.
 * @throws MethodInvocationException A method on a context object could not be invoked.
 * @throws ResourceNotFoundException A referenced resource could not be loaded.
 *
 * @since Velocity v1.1
 */
public static boolean mergeTemplate( String templateName, String encoding,
                                  Context context, Writer writer )
    throws ResourceNotFoundException, ParseErrorException, MethodInvocationException
{
    Template template = RuntimeSingleton.getTemplate(templateName, encoding);

    if ( template == null )
    {
        String msg = "Velocity.mergeTemplate() was unable to load template '"
                       + templateName + "'";
        getLog().error(msg);
        throw new ResourceNotFoundException(msg);
    }
    else
    {
        template.merge(context, writer);
        return true;
    }
}
 

/**
 *  merges a template and puts the rendered stream into the writer
 *
 *  @param templateName name of template to be used in merge
 *  @param encoding encoding used in template
 *  @param context  filled context to be used in merge
 *  @param  writer  writer to write template into
 *
 *  @return true if successful, false otherwise.  Errors
 *           logged to velocity log
 * @throws ResourceNotFoundException
 * @throws ParseErrorException
 * @throws MethodInvocationException
 *  @since Velocity v1.1
 */
public boolean mergeTemplate( String templateName, String encoding,
                                  Context context, Writer writer )
    throws ResourceNotFoundException, ParseErrorException, MethodInvocationException
{
    Template template = ri.getTemplate(templateName, encoding);

    if ( template == null )
    {
        String msg = "VelocityEngine.mergeTemplate() was unable to load template '"
                       + templateName + "'";
        getLog().error(msg);
        throw new ResourceNotFoundException(msg);
    }
    else
    {
        template.merge(context, writer);
        return true;
     }
}
 

/**
 * @see org.apache.velocity.runtime.parser.node.SimpleNode#render(org.apache.velocity.context.InternalContextAdapter, java.io.Writer)
 */
public boolean render( InternalContextAdapter context, Writer writer)
    throws IOException, MethodInvocationException,
    	ResourceNotFoundException, ParseErrorException
{
    SpaceGobbling spaceGobbling = rsvc.getSpaceGobbling();

    if (spaceGobbling == SpaceGobbling.NONE)
    {
        writer.write(prefix);
    }

    int i, k = jjtGetNumChildren();

    for (i = 0; i < k; i++)
        jjtGetChild(i).render(context, writer);

    if (morePostfix.length() > 0 || spaceGobbling.compareTo(SpaceGobbling.LINES) < 0)
    {
        writer.write(postfix);
    }

    writer.write(morePostfix);

    return true;
}
 

private void mergeTemplate(String name, String encoding, Map<String, Object> model, StringWriter writer) 
		throws ResourceNotFoundException, ParseErrorException, Exception {
	
    VelocityContext velocityContext = new VelocityContext(model);
    velocityContext.put("dateSymbol", new DateTool());
    velocityContext.put("numberSymbol", new NumberTool());
    velocityContext.put("mathSymbol", new MathTool());

    Template template = engine().getTemplate(name, encoding);
    template.merge(velocityContext, writer);
}
 

@Override
public boolean render(InternalContextAdapter context, Writer writer, Node node)
		throws IOException, ResourceNotFoundException, ParseErrorException,
		MethodInvocationException {
	List placeList=(List) context.get("placeList");
	if(placeList==null){
		return true;
	}
	Object value=node.jjtGetChild(0).value(context);
	placeList.add(value);
	writer.write("?");
	return true;
}
 

@Override
public boolean render(InternalContextAdapter context, Writer writer, Node node) throws IOException, ResourceNotFoundException, ParseErrorException, MethodInvocationException {
    String clazz = (String) node.jjtGetChild(0).value(context);
    if (context.containsKey(clazz)) {
        String packagePath = context.get(clazz).toString();
        packagePath = new StringBuilder("").append(packagePath).toString();
        writer.write(packagePath);
        return true;
    }
    return false;
}
 

@Override
public boolean render(InternalContextAdapter context, Writer writer, Node node) throws IOException, ResourceNotFoundException, ParseErrorException, MethodInvocationException {
    String value = (String) node.jjtGetChild(0).value(context);
    if (StringUtils.isBlank(value)) {
        writer.write(value);
        return true;
    }
    String result = value.replaceFirst(value.substring(0, 1), value.substring(0, 1).toLowerCase());
    writer.write(result);
    return true;
}
 

@Override
public boolean render(InternalContextAdapter context, Writer writer, Node node) throws IOException, ResourceNotFoundException, ParseErrorException, MethodInvocationException {
    String clazz = (String) node.jjtGetChild(0).value(context);
    if (context.containsKey(clazz)) {
        String packagePath = context.get(clazz).toString();
        packagePath = new StringBuilder("import ").append(packagePath).append(";\n").toString();
        writer.write(packagePath);
        return true;
    }
    return false;
}
 

@Override
public boolean render(InternalContextAdapter context, Writer writer, Node node) throws IOException, ResourceNotFoundException, ParseErrorException, MethodInvocationException {
    String prefix = (String) node.jjtGetChild(0).value(context);
    String str = (String) node.jjtGetChild(1).value(context);
    String suffix = (String) node.jjtGetChild(2).value(context);
    writer.write(String.valueOf(prefix + str + suffix));
    return true;
}
 

@Override
public boolean render(InternalContextAdapter context, Writer writer, Node node) throws IOException, ResourceNotFoundException, ParseErrorException, MethodInvocationException {
    String value = (String) node.jjtGetChild(0).value(context);
    String result = value.replaceFirst(value.substring(0, 1), value.substring(0, 1).toUpperCase());
    writer.write(result);
    return true;
}
 

@Override
public boolean render(InternalContextAdapter context, Writer writer, Node node)
		throws IOException, ResourceNotFoundException, ParseErrorException,
		MethodInvocationException {
	List placeList=(List) context.get("placeList");
	if(placeList==null){
		return true;
	}
	Object value=node.jjtGetChild(0).value(context);
	placeList.add(value);
	writer.write("?");
	return true;
}
 

@Test(expected = ParseErrorException.class)
public void testParseInvalidVelocityTemplate() {
    String templateString = "This alert ($category) was generated because $reason and $REASON from $source at $created_time #if() #fi";
    VelocityTemplateParser parser = new VelocityTemplateParser(templateString);
    Assert.assertEquals(5, parser.getReferenceNames().size());
    Assert.assertArrayEquals(new String[]{"category", "reason", "REASON", "source", "created_time"}, parser.getReferenceNames().toArray());
}
 

public boolean render(InternalContextAdapter context, Writer writer, Node node) 
  		throws IOException, ResourceNotFoundException, ParseErrorException, MethodInvocationException {
  	
  	//render content
  	StringWriter content = new StringWriter();
node.jjtGetChild(0).render(context, content);

//compress
if(enabled) {
	try {
		
		YuiCssCompressor compressor = new YuiCssCompressor();
		compressor.setLineBreak(yuiCssLineBreak);
		String result = compressor.compress(content.toString());
		
		writer.write(result);
	} catch (Exception e) {
		writer.write(content.toString());
		String msg = "Failed to compress content: "+content.toString();
           log.error(msg, e);
           throw new RuntimeException(msg, e);
           
	}
} else {
	writer.write(content.toString());
}

return true;
  	
  }
 

@Override
public final boolean render(InternalContextAdapter ica, Writer writer, Node node) throws IOException,
        ResourceNotFoundException, ParseErrorException, MethodInvocationException {
    Params p = getParams(ica, node);
    if (p == null) {
        return false;
    } else {
        return render(p, writer);
    }
}
 

protected Params getParams(final InternalContextAdapter context, final Node node) throws IOException,
        ResourceNotFoundException, ParseErrorException, MethodInvocationException {
    final Params params = new Params();
    final int nodes = node.jjtGetNumChildren();
    for (int i = 0; i < nodes; i++) {
        Node child = node.jjtGetChild(i);
        if (child != null) {
            if (!(child instanceof ASTBlock)) {
                if (i == 0) {
                    params.setPrefix(String.valueOf(child.value(context)));
                } else if (i == 1) {
                    params.setPrefixOverrides(String.valueOf(child.value(context)).toUpperCase(Locale.ENGLISH));
                } else if (i == 2) {
                    params.setSuffix(String.valueOf(child.value(context)));
                } else if (i == 3) {
                    params.setSuffixOverrides(String.valueOf(child.value(context)).toUpperCase(Locale.ENGLISH));
                } else {
                    break;
                }
            } else {
                StringWriter blockContent = new StringWriter();
                child.render(context, blockContent);
                if ("".equals(blockContent.toString().trim())) {
                    return null;
                }
                params.setBody(blockContent.toString().trim());
                break;
            }
        }
    }
    return params;
}
 

/**
 * Returns a markdown header string that should appear at the top of Stardoc's output, providing a
 * summary for the input Starlark module.
 */
public String renderMarkdownHeader(ModuleInfo moduleInfo) throws IOException {
  VelocityContext context = new VelocityContext();
  context.put("util", new MarkdownUtil());
  context.put("moduleDocstring", moduleInfo.getModuleDocstring());

  StringWriter stringWriter = new StringWriter();
  Reader reader = readerFromPath(headerTemplateFilename);
  try {
    velocityEngine.evaluate(context, stringWriter, headerTemplateFilename, reader);
  } catch (ResourceNotFoundException | ParseErrorException | MethodInvocationException e) {
    throw new IOException(e);
  }
  return stringWriter.toString();
}
 

private Set<String> prepareVelocityTemplate(String template)
		throws PIPException {
	VelocityContext vctx = new VelocityContext();
	EventCartridge vec = new EventCartridge();
	VelocityParameterReader reader = new VelocityParameterReader();
	vec.addEventHandler(reader);
	vec.attachToContext(vctx);

	try {
		Velocity.evaluate(vctx, new StringWriter(),
				"LdapResolver", template);
	}
	catch (ParseErrorException pex) {
		throw new PIPException(
				"Velocity template preparation failed",pex);
	}
	catch (MethodInvocationException mix) {
		throw new PIPException(
				"Velocity template preparation failed",mix);
	}
	catch (ResourceNotFoundException rnfx) {
		throw new PIPException(
				"Velocity template preparation failed",rnfx);
	}
	if (this.logger.isTraceEnabled()) {
		this.logger.trace("(" + id + ") " + template + " with parameters " + reader.parameters);
	}

	return reader.parameters;
}
 

private String evaluateVelocityTemplate(String template,
		final Map<String,PIPRequest> templateParameters,
		final PIPEngine pipEngine,
		final PIPFinder pipFinder) 
				throws PIPException {
	StringWriter out = new StringWriter();
	VelocityContext vctx = new VelocityContext();
	EventCartridge vec = new EventCartridge();
	VelocityParameterWriter writer = new VelocityParameterWriter(
			pipEngine, pipFinder, templateParameters);
	vec.addEventHandler(writer);
	vec.attachToContext(vctx);

	try {
		Velocity.evaluate(vctx, out,
				"LdapResolver", template);
	}
	catch (ParseErrorException pex) {
		throw new PIPException(
				"Velocity template evaluation failed",pex);
	}
	catch (MethodInvocationException mix) {
		throw new PIPException(
				"Velocity template evaluation failed",mix);
	}
	catch (ResourceNotFoundException rnfx) {
		throw new PIPException(
				"Velocity template evaluation failed",rnfx);
	}

	this.logger.warn("(" + id + ") " + " template yields " + out.toString());

	return out.toString();
}
 

/**
 * 获取并解析模版
 * @param templateFile
 * @return template
 * @throws Exception
 */
private static Template buildTemplate(String templateFile) {
	Template template = null;
	try {
		template = Velocity.getTemplate(templateFile);
	} catch (ResourceNotFoundException rnfe) {
		logger.error("buildTemplate error : cannot find template " + templateFile);
	} catch (ParseErrorException pee) {
		logger.error("buildTemplate error in template " + templateFile + ":" + pee);
	} catch (Exception e) {
		logger.error("buildTemplate error in template " + templateFile + ":" + e);
	}
	return template;
}
 

static boolean evaluate(@Nullable Project project, Context context, Writer writer, String templateContent)
        throws ParseErrorException, MethodInvocationException, ResourceNotFoundException {
  try {
    ourTemplateManager.set(project == null ? FileTemplateManager.getDefaultInstance() : FileTemplateManager.getInstance(project));
    return Velocity.evaluate(context, writer, "", templateContent);
  }
  finally {
    ourTemplateManager.set(null);
  }
}