Some code on Java & Groovy++ (real piece of Groovy++ compiler)

gistfile1.java

// Java version
Parameter param = new Parameter(ClassHelper.OBJECT_TYPE, "$it");
VariableExpression ve = new VariableExpression(param);
ve.setSourcePosition(originalProperty);

PropertyExpression prop = new PropertyExpression(ve, originalProperty);
prop.setSourcePosition(originalProperty);

ReturnStatement retStat = new ReturnStatement(prop);
retStat.setSourcePosition(originalProperty);

ClosureExpression ce = new ClosureExpression(new Parameter[]{param}, retStat);
ce.setVariableScope(new VariableScope(compiler.compileStack.getScope()));

MethodCallExpression mce = new MethodCallExpression(exp.getObjectExpression(), "map", ce);
mce.setSourcePosition(exp);
return compiler.transform(mce);



// Groovy++ version

Parameter param = [ClassHelper.OBJECT_TYPE, "$it"]
VariableExpression ve = [param]
ve.sourcePosition = originalProperty

PropertyExpression prop = [ve, originalProperty]
prop.sourcePosition = originalProperty

def retStat = new ReturnStatement(prop)
retStat.sourcePosition = originalProperty

def ce = new ClosureExpression([param], retStat)
ce.variableScope = [compiler.compileStack.scope]

MethodCallExpression mce = [exp.objectExpression, "map", ce]
mce.sourcePosition = exp
return compiler.transform(mce)



// Groovy++ version commented

// new object creation inferred
Parameter param = [ClassHelper.OBJECT_TYPE, "$it"]
// new object creation inferred
VariableExpression ve = [param]
// property setter
ve.sourcePosition = originalProperty

// new object creation inferred
PropertyExpression prop = [ve, originalProperty]
// property setter
prop.sourcePosition = originalProperty

// variable type inferred
def retStat = new ReturnStatement(prop)
// property setter
retStat.sourcePosition = originalProperty

// variable type and 1st parameter inferred
def ce = new ClosureExpression([param], retStat)
// property setter and new object creation
ce.variableScope = [compiler.compileStack.scope]

// new object creation inferred
MethodCallExpression mce = [exp.objectExpression, "map", ce]
// property setter
mce.sourcePosition = exp
return compiler.transform(mce)