I found a file containing xml like structure. I have no idea what it is but I need to parse it.
It looks like that:
<:openingtag>
<:openingtag2>
<:openingtag3>
text
</>
</>
</>
Does anybody has an idea how to parse it? Groovy / Java / Python are fine to implement the parser.
A naive parser using petit - but of course leaves alot to cover, since the grammatic is unknown.
#Grab("com.github.petitparser:petitparser-core:2.2.0")
import org.petitparser.tools.GrammarDefinition
import org.petitparser.tools.GrammarParser
import org.petitparser.parser.primitive.CharacterParser as CP
import org.petitparser.parser.primitive.StringParser as SP
import org.petitparser.utils.Functions as F
class FakeMLGrammerDefinition extends GrammarDefinition {
FakeMLGrammerDefinition() {
define("start",
ref("tag").trim())
define("tag",
ref("tag-start")
.seq(ref("tag").star())
.seq(ref("text").optional())
.seq(ref("tag").star())
.seq(ref("tag-end")))
define("tag-start",
SP.of('<:')
.seq(ref("keyword"))
.seq(SP.of(">"))
.trim())
define("tag-end",
SP.of("</>")
.trim())
define("text",
CP.pattern("^<").star().flatten().trim())
define("keyword",
CP.letter()
.seq(CP.pattern("^>").plus())
.star()
.flatten())
}
/** Helper for `def`, which is a keyword in groovy */
void define(s, p) { super.def(s,p) }
}
class FakeMLParserDefinition extends FakeMLGrammerDefinition {
FakeMLParserDefinition() {
action("tag", { tag, c1, t, c2, _ ->
[(tag): [children: c1+c2, text: t]]
})
action("tag-start", { it[1] })
}
}
class FakeMLParser extends GrammarParser {
FakeMLParser() {
super(new FakeMLParserDefinition())
}
}
println(new FakeMLParser().parse("""
<:openingtag>
<:openingtag2>
<:openingtag3>
text
</>
</>
</>
"""))
// Success[9:1]: {openingtag={children=[{openingtag2={children=[{openingtag3={children=[], text=text}}], text=}}], text=}}
Related
When working with gRPC, we need to generate the gRPC client and server interfaces from our .proto service definition via protocol buffer compiler (protoc) or using Gradle or Maven protoc build plugin.
Flow now: protobuf file -> java code -> gRPC client.
So, is there any way to skip this step?
How to create a generic gRPC client that can call the server directly from the protobuf file without compile into java code?
Or, is there a way to Generated Code at runtime?
Flow expect: protobuf file -> gRPC client.
I want to build a generic gRPC client system with the input are protobuf files along with description of method, package, message request ... without having to compile again for each protobuf.
Thank you very much.
Protobuf systems really need protoc to be run. However, the generated code could be skipped. Instead of passing something like --java_out and --grpc_java_out to protoc you can pass --descriptor_set_out=FILE which will parse the .proto file into a descriptor file. A descriptor file is a proto-encoded FileDescriptorSet. This is the same basic format as used with the reflection service.
Once you have a descriptor, you can load it a FileDescriptor at a time and create a DynamicMessage.
Then for the gRPC piece, you need to create a gRPC MethodDescriptor.
static MethodDescriptor from(
Descriptors.MethodDescriptor methodDesc
) {
return MethodDescriptor.<DynamicMessage, DynamicMessage>newBuilder()
// UNKNOWN is fine, but the "correct" value can be computed from
// methodDesc.toProto().getClientStreaming()/getServerStreaming()
.setType(getMethodTypeFromDesc(methodDesc))
.setFullMethodName(MethodDescriptor.generateFullMethodName(
serviceDesc.getFullName(), methodDesc.getName()))
.setRequestMarshaller(ProtoUtils.marshaller(
DynamicMessage.getDefaultInstance(methodDesc.getInputType())))
.setResponseMarshaller(ProtoUtils.marshaller(
DynamicMessage.getDefaultInstance(methodDesc.getOutputType())))
.build();
static MethodDescriptor.MethodType getMethodTypeFromDesc(
Descriptors.MethodDescriptor methodDesc
) {
if (!methodDesc.isServerStreaming()
&& !methodDesc.isClientStreaming()) {
return MethodDescriptor.MethodType.UNARY;
} else if (methodDesc.isServerStreaming()
&& !methodDesc.isClientStreaming()) {
return MethodDescriptor.MethodType.SERVER_STREAMING;
} else if (!methodDesc.isServerStreaming()) {
return MethodDescriptor.MethodType.CLIENT_STREAMING);
} else {
return MethodDescriptor.MethodType.BIDI_STREAMING);
}
}
At that point you have everything you need and can call Channel.newCall(method, CallOptions.DEFAULT) in gRPC. You're also free to use ClientCalls to use something more similar to the stub APIs.
So dynamic calls are definitely possible, and is used for things like grpcurl. But it also is not easy and so is generally only done when necessary.
I did it in Java, and the step is:
Call reflection service to get FileDescriptorProto list by method name
Get FileDescriptor of method from FileDescriptorProto list by package name, service name
Get MethodDescriptor from ServiceDescriptor which get from the FileDescriptor
Generate a MethodDescriptor<DynamicMessage, DynamicMessage> by MethodDescriptor
Build request DynamicMessage from content like JSON or others
Call method
Parse response content to JSON from DynamicMessage response
You can reference the full sample in project helloworlde/grpc-java-sample#reflection
And proto is:
syntax = "proto3";
package io.github.helloworlde.grpc;
option go_package = "api;grpc_gateway";
option java_package = "io.github.helloworlde.grpc";
option java_multiple_files = true;
option java_outer_classname = "HelloWorldGrpc";
service HelloService{
rpc SayHello(HelloMessage) returns (HelloResponse){
}
}
message HelloMessage {
string message = 2;
}
message HelloResponse {
string message = 1;
}
Start server for this proto by yourself, and the full code in Java just like:
import com.google.protobuf.ByteString;
import com.google.protobuf.DescriptorProtos;
import com.google.protobuf.Descriptors;
import com.google.protobuf.DynamicMessage;
import com.google.protobuf.InvalidProtocolBufferException;
import com.google.protobuf.TypeRegistry;
import com.google.protobuf.util.JsonFormat;
import io.grpc.CallOptions;
import io.grpc.ManagedChannel;
import io.grpc.ManagedChannelBuilder;
import io.grpc.MethodDescriptor;
import io.grpc.protobuf.ProtoUtils;
import io.grpc.reflection.v1alpha.ServerReflectionGrpc;
import io.grpc.reflection.v1alpha.ServerReflectionRequest;
import io.grpc.reflection.v1alpha.ServerReflectionResponse;
import io.grpc.stub.ClientCalls;
import io.grpc.stub.StreamObserver;
import lombok.SneakyThrows;
import lombok.extern.slf4j.Slf4j;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.concurrent.TimeUnit;
import java.util.stream.Collectors;
#Slf4j
public class ReflectionCall {
public static void main(String[] args) throws InterruptedException {
// 反射方法的格式只支持 package.service.method 或者 package.service
String methodSymbol = "io.github.helloworlde.grpc.HelloService.SayHello";
String requestContent = "{\"message\": \"Reflection\"}";
// 构建 Channel
ManagedChannel channel = ManagedChannelBuilder.forAddress("127.0.0.1", 9090)
.usePlaintext()
.build();
// 使用 Channel 构建 BlockingStub
ServerReflectionGrpc.ServerReflectionStub reflectionStub = ServerReflectionGrpc.newStub(channel);
// 响应观察器
StreamObserver<ServerReflectionResponse> streamObserver = new StreamObserver<ServerReflectionResponse>() {
#Override
public void onNext(ServerReflectionResponse response) {
try {
// 只需要关注文件描述类型的响应
if (response.getMessageResponseCase() == ServerReflectionResponse.MessageResponseCase.FILE_DESCRIPTOR_RESPONSE) {
List<ByteString> fileDescriptorProtoList = response.getFileDescriptorResponse().getFileDescriptorProtoList();
handleResponse(fileDescriptorProtoList, channel, methodSymbol, requestContent);
} else {
log.warn("未知响应类型: " + response.getMessageResponseCase());
}
} catch (Exception e) {
log.error("处理响应失败: {}", e.getMessage(), e);
}
}
#Override
public void onError(Throwable t) {
}
#Override
public void onCompleted() {
log.info("Complete");
}
};
// 请求观察器
StreamObserver<ServerReflectionRequest> requestStreamObserver = reflectionStub.serverReflectionInfo(streamObserver);
// 构建并发送获取方法文件描述请求
ServerReflectionRequest getFileContainingSymbolRequest = ServerReflectionRequest.newBuilder()
.setFileContainingSymbol(methodSymbol)
.build();
requestStreamObserver.onNext(getFileContainingSymbolRequest);
channel.awaitTermination(10, TimeUnit.SECONDS);
}
/**
* 处理响应
*/
private static void handleResponse(List<ByteString> fileDescriptorProtoList,
ManagedChannel channel,
String methodFullName,
String requestContent) {
try {
// 解析方法和服务名称
String fullServiceName = extraPrefix(methodFullName);
String methodName = extraSuffix(methodFullName);
String packageName = extraPrefix(fullServiceName);
String serviceName = extraSuffix(fullServiceName);
// 根据响应解析 FileDescriptor
Descriptors.FileDescriptor fileDescriptor = getFileDescriptor(fileDescriptorProtoList, packageName, serviceName);
// 查找服务描述
Descriptors.ServiceDescriptor serviceDescriptor = fileDescriptor.getFile().findServiceByName(serviceName);
// 查找方法描述
Descriptors.MethodDescriptor methodDescriptor = serviceDescriptor.findMethodByName(methodName);
// 发起请求
executeCall(channel, fileDescriptor, methodDescriptor, requestContent);
} catch (Exception e) {
log.error(e.getMessage(), e);
}
}
/**
* 解析并查找方法对应的文件描述
*/
private static Descriptors.FileDescriptor getFileDescriptor(List<ByteString> fileDescriptorProtoList,
String packageName,
String serviceName) throws Exception {
Map<String, DescriptorProtos.FileDescriptorProto> fileDescriptorProtoMap =
fileDescriptorProtoList.stream()
.map(bs -> {
try {
return DescriptorProtos.FileDescriptorProto.parseFrom(bs);
} catch (InvalidProtocolBufferException e) {
e.printStackTrace();
}
return null;
})
.filter(Objects::nonNull)
.collect(Collectors.toMap(DescriptorProtos.FileDescriptorProto::getName, f -> f));
if (fileDescriptorProtoMap.isEmpty()) {
log.error("服务不存在");
throw new IllegalArgumentException("方法的文件描述不存在");
}
// 查找服务对应的 Proto 描述
DescriptorProtos.FileDescriptorProto fileDescriptorProto = findServiceFileDescriptorProto(packageName, serviceName, fileDescriptorProtoMap);
// 获取这个 Proto 的依赖
Descriptors.FileDescriptor[] dependencies = getDependencies(fileDescriptorProto, fileDescriptorProtoMap);
// 生成 Proto 的 FileDescriptor
return Descriptors.FileDescriptor.buildFrom(fileDescriptorProto, dependencies);
}
/**
* 根据包名和服务名查找相应的文件描述
*/
private static DescriptorProtos.FileDescriptorProto findServiceFileDescriptorProto(String packageName,
String serviceName,
Map<String, DescriptorProtos.FileDescriptorProto> fileDescriptorProtoMap) {
for (DescriptorProtos.FileDescriptorProto proto : fileDescriptorProtoMap.values()) {
if (proto.getPackage().equals(packageName)) {
boolean exist = proto.getServiceList()
.stream()
.anyMatch(s -> serviceName.equals(s.getName()));
if (exist) {
return proto;
}
}
}
throw new IllegalArgumentException("服务不存在");
}
/**
* 获取前缀
*/
private static String extraPrefix(String content) {
int index = content.lastIndexOf(".");
return content.substring(0, index);
}
/**
* 获取后缀
*/
private static String extraSuffix(String content) {
int index = content.lastIndexOf(".");
return content.substring(index + 1);
}
/**
* 获取依赖类型
*/
private static Descriptors.FileDescriptor[] getDependencies(DescriptorProtos.FileDescriptorProto proto,
Map<String, DescriptorProtos.FileDescriptorProto> finalDescriptorProtoMap) {
return proto.getDependencyList()
.stream()
.map(finalDescriptorProtoMap::get)
.map(f -> toFileDescriptor(f, getDependencies(f, finalDescriptorProtoMap)))
.toArray(Descriptors.FileDescriptor[]::new);
}
/**
* 将 FileDescriptorProto 转为 FileDescriptor
*/
#SneakyThrows
private static Descriptors.FileDescriptor toFileDescriptor(DescriptorProtos.FileDescriptorProto fileDescriptorProto,
Descriptors.FileDescriptor[] dependencies) {
return Descriptors.FileDescriptor.buildFrom(fileDescriptorProto, dependencies);
}
/**
* 执行方法调用
*/
private static void executeCall(ManagedChannel channel,
Descriptors.FileDescriptor fileDescriptor,
Descriptors.MethodDescriptor originMethodDescriptor,
String requestContent) throws Exception {
// 重新生成 MethodDescriptor
MethodDescriptor<DynamicMessage, DynamicMessage> methodDescriptor = generateMethodDescriptor(originMethodDescriptor);
CallOptions callOptions = CallOptions.DEFAULT;
TypeRegistry registry = TypeRegistry.newBuilder()
.add(fileDescriptor.getMessageTypes())
.build();
// 将请求内容由 JSON 字符串转为相应的类型
JsonFormat.Parser parser = JsonFormat.parser().usingTypeRegistry(registry);
DynamicMessage.Builder messageBuilder = DynamicMessage.newBuilder(originMethodDescriptor.getInputType());
parser.merge(requestContent, messageBuilder);
DynamicMessage requestMessage = messageBuilder.build();
// 调用，调用方式可以通过 originMethodDescriptor.isClientStreaming() 和 originMethodDescriptor.isServerStreaming() 推断
DynamicMessage response = ClientCalls.blockingUnaryCall(channel, methodDescriptor, callOptions, requestMessage);
// 将响应解析为 JSON 字符串
JsonFormat.Printer printer = JsonFormat.printer()
.usingTypeRegistry(registry)
.includingDefaultValueFields();
String responseContent = printer.print(response);
log.info("响应: {}", responseContent);
}
/**
* 重新生成方法描述
*/
private static MethodDescriptor<DynamicMessage, DynamicMessage> generateMethodDescriptor(Descriptors.MethodDescriptor originMethodDescriptor) {
// 生成方法全名
String fullMethodName = MethodDescriptor.generateFullMethodName(originMethodDescriptor.getService().getFullName(), originMethodDescriptor.getName());
// 请求和响应类型
MethodDescriptor.Marshaller<DynamicMessage> inputTypeMarshaller = ProtoUtils.marshaller(DynamicMessage.newBuilder(originMethodDescriptor.getInputType())
.buildPartial());
MethodDescriptor.Marshaller<DynamicMessage> outputTypeMarshaller = ProtoUtils.marshaller(DynamicMessage.newBuilder(originMethodDescriptor.getOutputType())
.buildPartial());
// 生成方法描述, originMethodDescriptor 的 fullMethodName 不正确
return MethodDescriptor.<DynamicMessage, DynamicMessage>newBuilder()
.setFullMethodName(fullMethodName)
.setRequestMarshaller(inputTypeMarshaller)
.setResponseMarshaller(outputTypeMarshaller)
// 使用 UNKNOWN，自动修改
.setType(MethodDescriptor.MethodType.UNKNOWN)
.build();
}
}
There isn't much to prevent this technically. The two big hurdles are:
having a runtime-callable parser for reading the .proto, and
having a general purpose gRPC client available that takes things like the service method name as literals
Both are possible, but neither is trivial.
For 1, the crude way would be to shell/invoke protoc using the descriptor-set option to generate a schema binary, then deserialize that as a FileDescriptorSet (from descriptor.proto); this model gives you access to how protoc sees the file. Some platforms also have native parsers (essentially reimplementing protoc as a library in that platform), for example protobuf-net.Reflection does this in .NET-land
For 2, here's an implementation of that in C#. The approach should be fairly portable to Java, even if the details vary. You can look at a generated implementation to see how it works in any particular language.
(Sorry that the specific examples are C#/.NET, but that's where I live; the approaches should be portable, even if the specific code: not directly)
technically both are possible.
The codegen is simply generating a handful of classes; mainly protobuf messages, grpc method descriptors and stubs. You can implement it or check in the generated code to bypass the codegen. i am not sure what is the benefit of doing this tbh. Also, it will be very annoying if the proto is changed.
It is also possible to do it dynamically using byte codegen as long as you check-in some interfaces/abstract classes to represent those generated stub/method descriptors and protobuf messages. you have to make sure those non dynamic code is in sync with the proto definition though (most likely runtime check/exception).
I see every day that some app has a function that when you are on a page and you are filling, for example, a form and when you tried and click somewhere else for example in nav menu or even leave the page and you have unsafe change they ask the user if he wants to leave the page, I would really appreciate if someone can provide me an example of how can this be implemented in Angular, I am not sure if this is a front or backend job in backend I am working with java. Thanks a lot, each idea count :D.
You can use canDeactivate guard for every component,
First you have to add this service file "deactivate-guard.service.ts":
import { Injectable } from '#angular/core';
import { CanDeactivate } from '#angular/router';
import { Observable } from 'rxjs/Observable';
export interface CanComponentDeactivate {
canDeactivate: () => Observable<boolean> | Promise<boolean> | boolean;
}
#Injectable()
export class DeactivateGuardService implements CanDeactivate<CanComponentDeactivate>{
canDeactivate(component: CanComponentDeactivate) {
return component.canDeactivate ? component.canDeactivate() : true;
}
}
then you have to provide in the app module:
providers: [
DeactivateGuardService
]
now in the component you want to protect, add the function:
export class ExampleComponent {
loading: boolean = false;
#ViewChild('exampleForm') exampleForm: NgForm;
canDeactivate(): Observable<boolean> | boolean {
if (this.loading|| this.exampleForm.dirty) {
return this.confirmBox('Discard Unsaved Changes?');
}
return true;
}
confirmBox(message?: string): Observable<boolean> {
const confirmation = window.confirm(message || 'Are you sure?');
return of(confirmation);
};
}
Add the directive to the component in the routing module:
#NgModule({
imports: [
RouterModule.forRoot([
{
path: 'example',
canDeactivate: [DeactivateGuardService],
component: ExampleComponent
}
])
]
You can use the canDeactivate guard to check a page leave and display the warning message you wish to display something like this
import { Injectable } from '#angular/core';
import { CanDeactivate } from '#angular/router';
import { Observable } from 'rxjs/Observable';
export interface CanComponentDeactivate {
canDeactivate: () => Observable<boolean> | Promise<boolean> | boolean;
}
#Injectable()
export class CanDeactivateGuard implements CanDeactivate<CanComponentDeactivate>{
canDeactivate(component: CanComponentDeactivate) {
return component.canDeactivate ? component.canDeactivate() : true;
}
}
include set the can activate guard to the route like this
{ path: 'sample-path', component: SampleComponent, canDeactivate: [CanDeactivateGuard] },
and the canDeactivate method to the component
canDeactivate() {
if (this.formIsIncomplete > 0) {
let result: boolean = window.confirm("You have unsaved Changes");
return result;
}
return true;
}
it may helpful for you to make alert
https://stackblitz.com/edit/angular-confirmation-dialog
The Graph component is getting data (verified in console) but for some reason the page is still blank. I am not quit sure I understand how the map function works. This is the last piece I need to figure out to render this graph but for whatever reason I can't seem to get any graphics on the screen. The state of nodes in the console is:
{data: {action: [{action: "Changed", timestamp: 1499348050,…},…]}}
data:{action: [{action: "Changed", timestamp: 1499348050,…},…]}
action:[{action: "User Assist Changed", timestamp: 1499348050,…},…]
Graph Component:
import React, {Component} from 'react';
import * as d3 from "d3";
import {graphql} from 'react-apollo';
import getObjectsQuery from './Queries';
class Graph extends React.Component {
constructor(props) {
super(props);
this.state = { startTime:this.props.startTime,
endTime:this.props.endTime,
nodes:this.props.getObjectsQuery
}
//console.log('graph data:', this.props.data)
}
componentDidMount() {
console.log('nodes:', this.props.data)
this.force = d3.forceSimulation(this.props.data)
.force("charge",
d3.forceManyBody()
.strength(this.props.forceStrength)
)
.force("x", d3.forceX(this.props.width / 2))
.force("y", d3.forceY(this.props.height / 2));
this.force.on('tick', () => this.setState({nodes: this.props.data}));
console.log('setState:', this.props.data);
}
componentWillUnmount() {
this.force.stop();
}
render() {
// console.log('graph datas:', this.props.data)
return (
<svg width={this.props.width} height={this.props.height}>
{Object.keys(this.props.data).map((action, index) =>(
<circle r={action.action} cx={action.second} cy={action.obj} fill="red" key={index}/>
))}
</svg>
);
}//render
}//Component
export default graphql(getObjectsQuery,
{ options: (ownProps) => {
console.log(ownProps.startTime);
return ({ second: { startTime: ownProps.startTime,
endTime: ownProps.endTime
} })
} } )(Graph);
Graph.defaultProps = {
width: 300,
height: 300,
forceStrength: -10
};
If this.props.data.action is an array then it can be used directly in map:
{this.props.data.action.map((action,
but this.props.data.action (and even this.props.data?) can be undefined on start, first render
use some conditions in render to prevent errors, f.e.
{!this.props.data.loading && this.props.data.action.map((action,
Check if loading is present ... structure of props passed into component can be mapped differently by fn defined in config props property in graphql() (f.e. in case of conflict props names). Search for examples.
I have an audio file which it is in the .vox format and i want to convert that into the .mp3 format through java script i already got the code for the conversion but that code is in class file means that was in back end code,but i don't want that one through java script i want to convert the file.please help me.
Naudio dll download (free) using NAudio using NAudio.Wave
string convertedFileName = string.Format("{0}{1}", System.IO.Path.GetTempPath(), System.IO.Path.GetFileName(path).Replace(".vox", ".mp3"));
using (FileStream fileStream = new FileStream(path, FileMode.Open, FileAccess.Read))
{
using (var reader = new RawSourceWaveStream(fileStream, Mp3WaveFormat.CreateALawFormat(8000, 1)))
{
using (WaveStream convertedStream = WaveFormatConversionStream.CreatePcmStream(reader))
{
WaveFileWriter.CreateWaveFile(convertedFileName, convertedStream);
}
}
}
return File(convertedFileName, System.Net.Mime.MediaTypeNames.Application.Octet, System.IO.Path.GetFileName(convertedFileName));
If you have your code already in Java Language and your classes defined, you could use http://jdk6.java.net/plugin2/liveconnect/ LiveConnect, as this post point out:
calling java methods in javascript code
as the post points out, this is an example:
Java code:
public class MethodInvocation extends Applet {
public void noArgMethod() { ... }
public void someMethod(String arg) { ... }
public void someMethod(int arg) { ... }
public int methodReturningInt() { return 5; }
public String methodReturningString() { return "Hello"; }
public OtherClass methodReturningObject() { return new OtherClass(); }
}
public class OtherClass {
public void anotherMethod();
}
Web page and JavaScript code:
<applet id="app"
archive="examples.jar"
code="MethodInvocation" ...>
</applet>
<script language="javascript">
app.noArgMethod();
app.someMethod("Hello");
app.someMethod(5);
var five = app.methodReturningInt();
var hello = app.methodReturningString();
app.methodReturningObject().anotherMethod();
</script>
Hope it helps :)
Naudio dll download (free)
using NAudio;
using NAudio.Wave;
string convertedFileName = string.Format("{0}{1}", System.IO.Path.GetTempPath(), System.IO.Path.GetFileName(path).Replace(".vox", ".mp3"));
using (FileStream fileStream = new FileStream(path, FileMode.Open, FileAccess.Read))
{
using (var reader = new RawSourceWaveStream(fileStream, Mp3WaveFormat.CreateALawFormat(8000, 1)))
{
using (WaveStream convertedStream = WaveFormatConversionStream.CreatePcmStream(reader))
{
WaveFileWriter.CreateWaveFile(convertedFileName, convertedStream);
}
}
}
return File(convertedFileName, System.Net.Mime.MediaTypeNames.Application.Octet, System.IO.Path.GetFileName(convertedFileName));
I am using String template file to generate java files. For that i am using ANTLR. Code for One of the string template file is shown below:
package framework;
public abstract class Listener$GUIdriver.name$ {
$GUIdriver.commands:{ command |
public abstract void onNew$command.name;format="capital"$Command
($command.allParameter:{ param | $param.type.name$ newValue};separator=" , "$);
}; separator="\n"$
$GUIdriver.allDataAccess:{ dataAccess |
public abstract void onNew$dataAccess.dataAccessName;format="capital"$Request(String request);
}; separator="\n"$
}
But it doesnot produce effect of format="capital".How to incorporate such changes?Should i need to include any package or file?I am new to String Template & ANTLR.
The format string you want to use is "cap"
format="cap"
You'll need to register the StringRenderer first, however :-)
stGroup.registerRenderer(String.class, new StringRenderer());
More detail
Here's an example group file, testGroup.stg:
group testGroup;
test(text) ::= <<
<text; format="cap">
>>
and here's an example of using it:
import org.stringtemplate.v4.*;
public class Test {
public static void main(String[] args) {
STGroup stGroup = new STGroupFile("testGroup.stg");
ST st = stGroup.getInstanceOf("test");
stGroup.registerRenderer(String.class, new StringRenderer());
st.add("text", "helloWorld"); // note lower case 'h'
System.out.println(st.render());
}
}
This renders:
HelloWorld
method(item) ::= <<
<item.name; format="cap">Value
>>