Name Recipes/Metrics/MeasuringJava/MeasuringMethods

Examples

rascal>import lang::java::m3::Core;
ok
rascal>import lang::java::jdt::m3::Core;
ok
rascal>import lang::java::jdt::m3::AST;
ok

First extract our overview model

rascal>myModel = createM3FromEclipseProject(|project://example-project|);
M3: m3(|project://example-project|)[
  @annotations={
    <|java+method:///Apple/edible()|,|java+interface:///java/lang/Override|>,
    <|java+method:///Fruit/edible()|,|java+interface:///java/lang/Override|>
  },
  @typeDependency={
    <|java+method:///HelloWorld/main(java.lang.String%5B%5D)|,|java+class:///java/io/PrintStream|>,
    <|java+method:///Apple/edible()|,|java+primitiveType:///boolean|>,
    <|java+method:///Apple/edible()|,|java+interface:///java/lang/Override|>,
    <|java+method:///Fruit/edible()|,|java+primitiveType:///boolean|>,
    <|java+method:///Fruit/edible()|,|java+interface:///java/lang/Override|>,
    <|java+parameter:///HelloWorld/main(java.lang.String%5B%5D)/args|,|java+array:///java/lang/String%5B%5D|>,
    <|java+method:///HelloWorld/main(java.lang.String%5B%5D)|,|java+class:///java/lang/System|>,
    <|java+class:///Apple|,|java+class:///Fruit|>,
    <|java+method:///IFruit/edible()|,|java+primitiveType:///boolean|>,
    <|java+method:///HelloWorld/main(java.lang.String%5B%5D)|,|java+primitiveType:///void|>,
    <|java+parameter:///HelloWorld/main(java.lang.String%5B%5D)/args|,|java+class:///java/lang/String|>,
    <|java+class:///Fruit|,|java+interface:///IFruit|>
  },
  @methodOverrides={
    <|java+method:///Apple/edible()|,|java+method:///IFruit/edible()|>,
    <|java+method:///Fruit/edible()|,|java+method:///IFruit/edible()|>,
    <|java+method:///Apple/edible()|,|java+method:///Fruit/edible()|>
  },
  @names={
    <"IFruit",|java+interface:///IFruit|>,
    <"HelloWorld",|java+class:///HelloWorld|>,
    <"args",|java+parameter:///HelloWorld/main(java.lang.String%5B%5D)/args|>,
    <"edible",|java+method:///Fruit/edible()|>,
    <"out",|java+field:///java/lang/System/out|>,
    <"edible",|java+method:///Apple/edible()|>,
    <"main",|java+method:///HelloWorld/main(java.lang.String%5B%5D)|>,
    <"String",|java+class:///java/lang/String|>,
    <"edible",|java+method:///IFruit/edible()|>,
    <"println",|java+method:///java/io/PrintStream/println(java.lang.String)|>,
    <"Override",|java+interface:///java/lang/Override|>,
    <"System",|java+class:///java/lang/System|>,
    <"Apple",|java+class:///Apple|>,
    <"Fruit",|java+class:///Fruit|>
  },
  @implements={<|java+class:///Fruit|,|java+interface:///IFruit|>},
  @methodInvocation={<|java+method:///HelloWorld/main(java.lang.String%5B%5D)|,|java+method:///java/io/PrintStream/println(java.lang.String)|>},
  @containment={
    <|java+compilationUnit:///src/IFruit.java|,|java+interface:///IFruit|>,
    <|java+method:///HelloWorld/main(java.lang.String%5B%5D)|,|java+parameter:///HelloWorld/main(java.lang.String%5B%5D)/args|>,
    <|java+class:///Fruit|,|java+method:///Fruit/edible()|>,
    <|java+class:///HelloWorld|,|java+method:///HelloWorld/main(java.lang.String%5B%5D)|>,
    <|java+compilationUnit:///src/Fruit.java|,|java+class:///Fruit|>,
    <|java+compilationUnit:///src/HelloWorld.java|,|java+class:///HelloWorld|>,
    <|java+class:///Apple|,|java+method:///Apple/edible()|>,
    <|java+interface:///IFruit|,|java+method:///IFruit/edible()|>,
    <|java+compilationUnit:///src/Apple.java|,|java+class:///Apple|>
  },
  @documentation={},
  @modifiers={
    <|java+interface:///IFruit|,public()>,
    <|java+method:///HelloWorld/main(java.lang.String%5B%5D)|,static()>,
    <|java+class:///Fruit|,abstract()>,
    <|java+method:///Apple/edible()|,public()>,
    <|java+method:///Fruit/edible()|,public()>,
    <|java+class:///Apple|,public()>,
    <|java+method:///HelloWorld/main(java.lang.String%5B%5D)|,public()>,
    <|java+class:///HelloWorld|,public()>,
    <|java+method:///Fruit/edible()|,abstract()>,
    <|java+class:///Fruit|,public()>
  },
  @fieldAccess={<|java+method:///HelloWorld/main(java.lang.String%5B%5D)|,|java+field:///java/lang/System/out|>},
  @messages=[],
  @uses={
    <|project://example-project/src/Apple.java|(28,5,<2,27>,<2,32>),|java+class:///Fruit|>,
    <|project://example-project/src/HelloWorld.java|(71,6,<4,2>,<4,8>),|java+class:///java/lang/System|>,
    <|project://example-project/src/HelloWorld.java|(82,7,<4,13>,<4,20>),|java+method:///java/io/PrintStream/println(java.lang.String)|>,
    <|project://example-project/src/Fruit.java|(51,8,<3,2>,<3,10>),|java+interface:///java/lang/Override|>,
    <|project://example-project/src/Apple.java|(39,8,<4,2>,<4,10>),|java+interface:///java/lang/Override|>,
    <|project://example-project/src/HelloWorld.java|(78,3,<4,9>,<4,12>),|java+field:///java/lang/System/out|>,
    <|project://example-project/src/Fruit.java|(40,6,<2,39>,<2,45>),|java+interface:///IFruit|>,
    <|project://example-project/src/HelloWorld.java|(52,6,<3,25>,<3,31>),|java+class:///java/lang/String|>
  },
  @types={
    <|java+class:///HelloWorld|,class(
      |java+class:///HelloWorld|,
      [])>,
    <|java+class:///Fruit|,class(
      |java+class:///Fruit|,
      [])>,
    <|java+class:///Apple|,class(
      |java+class:///Apple|,
      [])>,
    <|java+method:///IFruit/edible()|,method(
      |java+method:///IFruit/edible()|,
      [],
      boolean(),
      [])>,
    <|java+parameter:///HelloWorld/main(java.lang.String%5B%5D)/args|,array(
      class(
        |java+class:///java/lang/String|,
        []),
      1)>,
    <|java+method:///HelloWorld/main(java.lang.String%5B%5D)|,method(
      |java+method:///HelloWorld/main(java.lang.String%5B%5D)|,
      [],
      void(),
      [array(
          class(
            |java+class:///java/lang/String|,
            []),
          1)])>,
    <|java+method:///Apple/edible()|,method(
      |java+method:///Apple/edible()|,
      [],
      boolean(),
      [])>,
    <|java+method:///Fruit/edible()|,method(
      |java+method:///Fruit/edible()|,
      [],
      boolean(),
      [])>,
    <|java+interface:///IFruit|,interface(
      |java+interface:///IFruit|,
      [])>
  },
  @extends={<|java+class:///Apple|,|java+class:///Fruit|>},
  @declarations={
    <|java+method:///HelloWorld/main(java.lang.String%5B%5D)|,|project://example-project/src/HelloWorld.java|(28,82,<3,1>,<6,2>)>,
    <|java+compilationUnit:///src/IFruit.java|,|project://example-project/src/IFruit.java|(0,48,<1,0>,<4,2>)>,
    <|java+method:///Apple/edible()|,|project://example-project/src/Apple.java|(38,54,<4,1>,<7,2>)>,
    <|java+parameter:///HelloWorld/main(java.lang.String%5B%5D)/args|,|project://example-project/src/HelloWorld.java|(52,13,<3,25>,<3,38>)>,
    <|java+compilationUnit:///src/HelloWorld.java|,|project://example-project/src/HelloWorld.java|(0,113,<1,0>,<7,2>)>,
    <|java+class:///HelloWorld|,|project://example-project/src/HelloWorld.java|(1,111,<2,0>,<7,1>)>,
    <|java+compilationUnit:///src/Apple.java|,|project://example-project/src/Apple.java|(0,96,<1,0>,<9,2>)>,
    <|java+class:///Apple|,|project://example-project/src/Apple.java|(1,94,<2,0>,<9,1>)>,
    <|java+class:///Fruit|,|project://example-project/src/Fruit.java|(1,95,<2,0>,<5,1>)>,
    <|java+interface:///IFruit|,|project://example-project/src/IFruit.java|(1,46,<2,0>,<4,1>)>,
    <|java+compilationUnit:///src/Fruit.java|,|project://example-project/src/Fruit.java|(0,97,<1,0>,<5,2>)>,
    <|java+method:///IFruit/edible()|,|project://example-project/src/IFruit.java|(28,17,<3,1>,<3,18>)>,
    <|java+method:///Fruit/edible()|,|project://example-project/src/Fruit.java|(50,44,<3,1>,<4,34>)>
  }
]

Now let's focus on the methods

rascal>myMethods = methods(myModel);
set[loc]: {
  |java+method:///Apple/edible()|,
  |java+method:///Fruit/edible()|,
  |java+method:///IFruit/edible()|,
  |java+method:///HelloWorld/main(java.lang.String%5B%5D)|
}

What is the source code for a method?

rascal>import IO;
ok
rascal>methodSrc = readFile(|java+method:///HelloWorld/main(java.lang.String%5B%5D)|);
str: "public static void main(String[] args) {\n\t\tSystem.out.println(\"Hello World!\");\n\n\t}"

let's print it:

rascal>println(methodSrc)
public static void main(String[] args) {
		System.out.println("Hello World!");

	}
ok

how many words in this method?

rascal>(0 | it + 1 | /\W+/ := methodSrc)
int: 11

let's get its AST

rascal>methodAST = getMethodASTEclipse(|java+method:///HelloWorld/main(java.lang.String%5B%5D)|, model=myModel);
Declaration: method(
  void(),
  "main",
  [parameter(
      arrayType(simpleType(simpleName("String")[
            @src=|project://example-project/src/HelloWorld.java|(52,6,<3,25>,<3,31>),
            @decl=|java+class:///java/lang/String|,
            @typ=class(
              |java+class:///java/lang/String|,
              [])
          ])),
      "args",
      0)[
      @src=|project://example-project/src/HelloWorld.java|(52,13,<3,25>,<3,38>),
      @decl=|java+parameter:///HelloWorld/main(java.lang.String%5B%5D)/args|,
      @typ=array(
        class(
          |java+class:///java/lang/String|,
          []),
        1)
    ]],
  [],
  block([expressionStatement(methodCall(
          false,
          qualifiedName(
            simpleName("System")[
              @src=|project://example-project/src/HelloWorld.java|(71,6,<4,2>,<4,8>),
              @decl=|java+class:///java/lang/System|,
              @typ=class(
                |java+class:///java/lang/System|,
                [])
            ],
            simpleName("out")[
              @src=|project://example-project/src/HelloWorld.java|(78,3,<4,9>,<4,12>),
              @decl=|java+field:///java/lang/System/out|,
              @typ=class(
                |java+class:///java/io/PrintStream|,
                [])
            ])[
            @src=|project://example-project/src/HelloWorld.java|(71,10,<4,2>,<4,12>),
            @decl=|java+field:///java/lang/System/out|,
            @typ=class(
              |java+class:///java/io/PrintStream|,
              [])
          ],
          "println",
          [stringLiteral("\"Hello World!\"")[
              @src=|project://example-project/src/HelloWorld.java|(90,14,<4,21>,<4,35>),
              @typ=class(
                |java+class:///java/lang/String|,
                [])
            ]])[
          @src=|project://example-project/src/HelloWorld.java|(71,34,<4,2>,<4,36>),
          @decl=|java+method:///java/io/PrintStream/println(java.lang.String)|,
          @typ=void()
        ])[
        @src=|project://example-project/src/HelloWorld.java|(71,35,<4,2>,<4,37>)
      ]])[
    @src=|project://example-project/src/HelloWorld.java|(67,43,<3,40>,<6,2>)
  ])[
  @modifiers=[
    public(),
    static()
  ],
  @src=|project://example-project/src/HelloWorld.java|(28,82,<3,1>,<6,2>),
  @decl=|java+method:///HelloWorld/main(java.lang.String%5B%5D)|,
  @typ=method(
    |java+method:///HelloWorld/main(java.lang.String%5B%5D)|,
    [],
    void(),
    [array(
        class(
          |java+class:///java/lang/String|,
          []),
        1)])
]

Now we count the number of expressions:

rascal>(0 | it + 1 | /Expression _ := methodAST)
int: 6

or give us the locations of all expressions:

rascal>[m@src | /Expression m := methodAST]
list[loc]: [
  |project://example-project/src/HelloWorld.java|(52,6,<3,25>,<3,31>),
  |project://example-project/src/HelloWorld.java|(71,6,<4,2>,<4,8>),
  |project://example-project/src/HelloWorld.java|(78,3,<4,9>,<4,12>),
  |project://example-project/src/HelloWorld.java|(71,10,<4,2>,<4,12>),
  |project://example-project/src/HelloWorld.java|(90,14,<4,21>,<4,35>),
  |project://example-project/src/HelloWorld.java|(71,34,<4,2>,<4,36>)
]

the size should be the same, right?

rascal>import List;
ok
rascal>size([m@src | /Expression m := methodAST]) == (0 | it + 1 | /Expression _ := methodAST)
bool: true

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