javaparser
Java 1.8 Parser and Abstract Syntax Tree for Java –
JavaParser by javaparser
I am using Javaparser to parse Java source code.
Is there a way to implement a Visitor that can visit the abstract Node class?
I want to visit every Node and print its line number, but I don't want to implement a visit() method for every Node type (AssignExpr, BinaryExpr, IfStmt, etc...) because there are so many types.
Source: (StackOverflow)
I need to display the list of methods along with signature for a java class using javaparser.
I know how to display the list of methods with out signature but not along with signature.
Can any one provide some examples to get methods along with signature.
Source: (StackOverflow)
I am working in building halstead Metrics in java and I am using javaparser library and I am confusing about how I can find all java reserved words in the java imported file which will be parsing to find the operator (n1) ?
Source: (StackOverflow)
I have a class like below.
public class Login {
private Keyword browser;
private String page;
}
Keyword is a class in different package. I want to get the fully qualified name of the class Keyword while parsing the Login class using javaparser.
Source: (StackOverflow)
I want to get typed AST from JavaParser or another parser of Java code. It means I would be able to get the type for a specific variable or parameters+returning type of a method. I googled a lot about this feature of JavaParser, but didn't find anything, I assume this is because JavaParser makes untyped AST. So, advise me how I can get this. But please don't say to parse all the code and make my own set of types, I tried and this is very hard, I think this is harder than making my own AST parser.
Source: (StackOverflow)
Using JavaParser I can get a list of my methods and fields using:
//List of all methods
System.out.println("Methods: " + this.toString());
List<TypeDeclaration> types = n.getTypes();
for (TypeDeclaration type : types)
{
List<BodyDeclaration> members = type.getMembers();
for (BodyDeclaration member : members)
{
if (member instanceof MethodDeclaration)
{
MethodDeclaration method = (MethodDeclaration) member;
System.out.println("Methods: " + method.getName());
}
}
}
//List all field variables.
System.out.println("Field Variables: " + this.toString());
List<TypeDeclaration> f_vars = n.getTypes();
for (TypeDeclaration type : f_vars)
{
List<BodyDeclaration> members = type.getMembers();
for (BodyDeclaration member : members)
{
if (member instanceof FieldDeclaration)
{
FieldDeclaration myType = (FieldDeclaration) member;
List <VariableDeclarator> myFields = myType.getVariables();
System.out.println("Fields: " + myType.getType() + ":" + myFields.toString());
}
}
}
But I can't figure out how to get a list of my variables. I simply want a list of all variables from a java source, regardless of scope.
Source: (StackOverflow)
In my code I open my file.java and parse him with JavaParser.
FileInputStream in = new FileInputStream(".../file.java");
CompilationUnit cu;
try {
// parse the file
cu = JavaParser.parse(in);
} finally {
in.close();
}
........
file.java:
public class File{
public void ownMethod(){...}
public static void main(String[] args){
ownMethod(5); //Note the extra parameter
}
}
In file.java there is an error: The method main calls the method ownMethod with one parameter, but ownMethod expects 0 parameters. JavaParser doesn't detect this error and parses file.java with this error. How can I know (in my code) whether file.java has no errors? Is it posible without using a java compiler?
Source: (StackOverflow)
I'm trying to code rfc metric (Response for a Class), it counts the Method declarations + Method Calls.
Method declarations works fine, but I got a problem at counting method calls using JavaParser API.
Here is my code:
public class MethodPrinter {
public static void main(String[] args) throws Exception {
// creates an input stream for the file to be parsed
FileInputStream in = new FileInputStream("D://test.java");
CompilationUnit cu;
try {
// parse the file
cu = JavaParser.parse(in);
} finally {
in.close();
}
// visit and print the methods names
MethodVisitor MV =new MethodVisitor();
cu.accept(new VoidVisitorAdapter<Void>(){
@Override
public void visit(final MethodCallExpr n, final Void arg){
System.out.println("method call :"+n);
super.visit(n, arg);
}
}, null);
}
}
test.java
package test;
import java.util.*;
public class ClassA
{
private int test;
private ClassB classB = new ClassB();
public void doSomething(int t){
System.out.println ( toString());
int i= doSomethingBasedOnClassBBV(classB.toString());
}
protected void doSomethingBasedOnClassB(){
System.out.println (classB.toString());
}
}
public class ClassB
{
private ClassA classA = new ClassA();
public void doSomethingBasedOneClassA(){
System.out.println (classA.toString());
}
private String toString(){
return "classB";
}
private String toString(){
return "classB";
}
public void doSomethingBasedOneClassA(){
System.out.println (classA.toString());
}
protected void doSomethingBasedOnClassB(){
System.out.println (classB.toString());
}
}
the result of that code:
*method call :System.out.println(toString())
method call :toString()
method call :doSomethingBasedOnClassBBV(classB.toString())
method call :classB.toString()
method call :System.out.println(classB.toString())
method call :classB.toString()
method call :System.out.println(classA.toString())
method call :classA.toString()
method call :System.out.println(classA.toString())
method call :classA.toString()
method call :System.out.println(classB.toString())
method call :classB.toString()*
indeed, that code inspects method calls, but in my case I don't want it to count libraries method calls like System.out.println(toString()), I want it to count only toString().
If you got a better code, or another API to use... any help is welcomed, thank you in advance.
Source: (StackOverflow)
I'm using javaparser-1.0.8 and I'm trying to generate the following generic method.
public <T extends SomeInterface> T get(int param) {
return (T) doSomeMagic(param);
}
I have the following code that is supposed to build the method:
public static void main(String[] args) throws Exception {
// creates an input stream for the file to be parsed
File mainActivity = new File("<path>/Main.java");
FileInputStream in = new FileInputStream(mainActivity);
CompilationUnit cu;
try {
// parse the file
cu = JavaParser.parse(in);
addMethod(cu);
} finally {
in.close();
}
// prints the resulting compilation unit to default system output
System.out.println(cu.toString());
}
private static void addMethod(CompilationUnit cu) {
WildcardType wildcardType = new japa.parser.ast.type.WildcardType(ASTHelper.createReferenceType("SomeInterface", 0));
MethodDeclaration method = new MethodDeclaration(ModifierSet.PUBLIC, wildcardType, "get");
method.setModifiers(ModifierSet.addModifier(method.getModifiers(), ModifierSet.PUBLIC));
Parameter param = ASTHelper.createParameter(ASTHelper.INT_TYPE, "id");
ASTHelper.addParameter(method, param);
BlockStmt block = new BlockStmt();
method.setBody(block);
ASTHelper.addMember(cu.getTypes().get(0), method);
}
output:
public ? extends SomeInterface get(int id) {
}
Source: (StackOverflow)
I'm using the MethodDeclaration for a java parser that reads in source code but I'm having some problems. I can't see any methods which give me the class that this belongs to. Does a method exist for this or do I need to look in the java parser to try and create a way that will attach each MethodDeclaration to it's ClassOrInterfaceDeclaration .
I either need a way of detecting if a MethodDeclaration belongs to a class or I need a way of getting all of the methods in a ClassOrInterfaceDeclaration.
edit to make this more clear:
MethodDeclaration m = oldMethodDeclaration ; //where oldMethodDeclaration is already defined method declaration
I need a way to find the class that "m" belongs to. In the following example it will return "ClassName"
ie
public class ClassName{
public void oldMethodDeclaration (){
}
}
Alternatively if I have
ClassOrInterfaceDeclaration ClassName;
is it possible for me to find a list of method names attached to it?
Source: (StackOverflow)
Here is my token table:
TOKEN :
{
< A : "A" >
| < B : "B" >
| < C : "C" >
}
I have this code that contains 2 choice conflicts.
void Start() : {} {
< A> [ Bs() ] "-" < A>
}
void Bs() : {} {
( "-" < B> )+
}
In order to remove the choice conflicts warning, I need to add 2 LOOKAHEAD statements like so...
void Start() : {} {
< A> [ LOOKAHEAD(2) Bs() ] "-" < A>
}
void Bs() : {} {
( LOOKAHEAD(1) "-" < B> )+
}
I understand why the first LOOKAHEAD(2) is needed but I have no idea why the second LOOKAHEAD(1) is needed. Can someone please explain?
Similarly for this example...
void Start() :{} {
one()
|
two()
|
three()
|
four()
}
void one() : {} {
[ <B> ] ( <A> )* <C>
}
void two() : {} {
<B> <A> < A> <B>
}
void three() : {} {
<B> <B> <A> [ <B> ] <A>
}
void four() : {} {
<A> [ <B><C> ] two()
}
In order to remove the choice conflicts, I need to add LOOKAHEADS like so...
void Start() :{} {
LOOKAHEAD(1) one()
|
LOOKAHEAD(1) two()
|
three()
|
four()
}
void one() : {} {
[ <B> ] ( <A> )* <C>
}
void two() : {} {
<B> <A> < A> <B>
}
void three() : {} {
<B> <B> <A> [ <B> ] <A>
}
void four() : {} {
<A> [ LOOKAHEAD(1) <B><C> ] two()
}
I have no idea why these LOOKAHEADS remove the warnings. Any help understanding would be appreciated.
Source: (StackOverflow)
JavaParser is a java source code parsing tool. I read the documents but found it only able to parse source of a full java class, like:
public class X {
public void show(String id) {
Question q = Quesiton.findById(id);
aaa.BBB.render(q);
}
}
But I want to parse only part of it, e.g. the method declaration:
public void show(String id) {
Question q = Quesiton.findById(id);
aaa.BBB.render(q);
}
How to do it or is it possible? If not, is there any other tool can do this?
Update
Actually I want to parse any valid expression in java, so I can do this easily with JavaParser:
CompilationUnit unit = JavaParser.parse(codeInputStream);
addField(unit, parseField("public String name")); // not possible now
Source: (StackOverflow)
I have some JSON with the following structure:
{
"items":[
{
"product":{
"product_id":"some",
"price_id":"some",
"price":"some",
"title_fa":"some",
"title_en":"Huawei Ascend Y300",
"img":"some",
"has_discount_from_price":"0",
"discount_from_price":null,
"type_discount_from_price":null,
"has_discount_from_product":"0",
"discount_from_product":null,
"type_discount_from_product":null,
"has_discount_from_category":"0",
"discount_from_category":null,
"type_discount_from_category":null,
"has_discount_from_brand":"0",
"discount_from_brand":null,
"type_discount_from_brand":null,
"weight":null,
"features":[
{
"feature_value":"#000000",
"feature_id":"some",
"feature_title":"some"
},
{
"feature_value":"some",
"feature_id":"1652",
"feature_title":"some"
}
]
},
"number":1,
"feature_id":"56491,56493",
"price_inf":{
"has_discount":0,
"discount_type":0,
"final_price":"400000",
"value_discount":0
},
"cart_id":13
}
]
}
I'm trying to access the elements "product_id" and "price_id" with the following Java code:
try{
JSONArray feedArray=response.getJSONArray("items");
for (int i=0;i<feedArray.length();i++){
JSONObject feedObj=feedArray.getJSONObject(i);
JSONObject pro=feedObj.getJSONObject("product");
Product product = new Product();
product.setPrice(pro.getDouble("price_id"));
product.setTitle_fa(pro.getString("price_id"));}}
but i see product not found error.what is wrong in my parser?
Source: (StackOverflow)
The wider context is that I am writing a tool which tries to rough-estimate the consultancy potential of a java developer with respect to various java libraries/technologies across projects in an organization.
The version history of a file gives me the developer who wrote/modified each line of code. If I can map java source code constructs to particular import statements(wherever relevent) I can give come up with a scoring system to assign points to developers for each usage of a java library api.
Source: (StackOverflow)
I want to get only the class level variable declarations. How can i get the declarations using javaparser?
public class Login {
private Keyword browser;
private String pageTitle = "Login";
}
Using javaparser have to get the details of variable "browser" like the type of browser is "KeyWord"
Source: (StackOverflow)