in src/main/java/org/apache/sling/scripting/sightly/impl/plugin/RepeatPlugin.java [49:196]
public PluginInvoke invoke(
final Expression expression, final PluginCallInfo callInfo, final CompilerContext compilerContext) {
return new DefaultPluginInvoke() {
private String listVariable = compilerContext.generateVariable("collectionVar");
private String collectionSizeVar = compilerContext.generateVariable("size");
private String collectionNotEmpty = compilerContext.generateVariable("notEmpty");
private String beginVariable = compilerContext.generateVariable(BEGIN);
private String stepVariable = compilerContext.generateVariable(STEP);
private String endVariable = compilerContext.generateVariable(END);
private String validStartStepEnd = compilerContext.generateVariable("validStartStepEnd");
private boolean beginAtIndexZero = false;
private boolean stepOne = false;
@Override
public void beforeElement(PushStream stream, String tagName) {
stream.write(new VariableBinding.Start(listVariable, expression.getRoot()));
stream.write(new VariableBinding.Start(
collectionSizeVar, new UnaryOperation(UnaryOperator.LENGTH, new Identifier(listVariable))));
stream.write(new VariableBinding.Start(
collectionNotEmpty,
new BinaryOperation(
BinaryOperator.GT, new Identifier(collectionSizeVar), NumericConstant.ZERO)));
stream.write(new Conditional.Start(collectionNotEmpty, true));
Map<String, ExpressionNode> options = expression.getOptions();
if (options.containsKey(BEGIN)) {
stream.write(new VariableBinding.Start(
beginVariable, expression.getOptions().get(BEGIN)));
} else {
beginAtIndexZero = true;
stream.write(new VariableBinding.Start(beginVariable, NumericConstant.ZERO));
}
if (options.containsKey(STEP)) {
stream.write(new VariableBinding.Start(
stepVariable, expression.getOptions().get(STEP)));
} else {
stepOne = true;
stream.write(new VariableBinding.Start(stepVariable, NumericConstant.ONE));
}
if (options.containsKey(END)) {
stream.write(new VariableBinding.Start(
endVariable, expression.getOptions().get(END)));
} else {
stream.write(new VariableBinding.Start(endVariable, new Identifier(collectionSizeVar)));
}
stream.write(new VariableBinding.Start(
validStartStepEnd,
new BinaryOperation(
BinaryOperator.AND,
new BinaryOperation(
BinaryOperator.AND,
new BinaryOperation(
BinaryOperator.LT,
new Identifier(beginVariable),
new Identifier(collectionSizeVar)),
new BinaryOperation(
BinaryOperator.AND,
new BinaryOperation(
BinaryOperator.GEQ,
new Identifier(beginVariable),
NumericConstant.ZERO),
new BinaryOperation(
BinaryOperator.GT,
new Identifier(stepVariable),
NumericConstant.ZERO))),
new BinaryOperation(
BinaryOperator.GT, new Identifier(endVariable), NumericConstant.ZERO))));
stream.write(new Conditional.Start(validStartStepEnd, true));
String itemVariable = decodeItemVariable();
String loopStatusVar = Syntax.itemLoopStatusVariable(itemVariable);
String indexVariable = compilerContext.generateVariable("index");
stream.write(new Loop.Start(listVariable, itemVariable, indexVariable));
stream.write(
new VariableBinding.Start(loopStatusVar, buildStatusObj(indexVariable, collectionSizeVar)));
String stepConditionVariable = compilerContext.generateVariable("stepCondition");
stream.write(new VariableBinding.Start(
stepConditionVariable,
beginAtIndexZero && stepOne
? new NumericConstant(0)
: new BinaryOperation(
BinaryOperator.REM,
new BinaryOperation(
BinaryOperator.SUB,
new Identifier(indexVariable),
new Identifier(beginVariable)),
new Identifier(stepVariable))));
String loopTraversalVariable = compilerContext.generateVariable("traversal");
stream.write(new VariableBinding.Start(
loopTraversalVariable,
new BinaryOperation(
BinaryOperator.AND,
new BinaryOperation(
BinaryOperator.AND,
new BinaryOperation(
BinaryOperator.GEQ,
new Identifier(indexVariable),
new Identifier(beginVariable)),
new BinaryOperation(
BinaryOperator.LEQ,
new Identifier(indexVariable),
new Identifier(endVariable))),
new BinaryOperation(
BinaryOperator.EQ,
new Identifier(stepConditionVariable),
NumericConstant.ZERO))));
stream.write(new Conditional.Start(loopTraversalVariable, true));
}
@Override
public void afterTagClose(PushStream stream, boolean isSelfClosing) {
stream.write(NEW_LINE);
}
@Override
public void afterElement(PushStream stream) {
stream.write(Conditional.END);
stream.write(VariableBinding.END);
stream.write(VariableBinding.END);
stream.write(VariableBinding.END);
stream.write(Loop.END);
stream.write(Conditional.END);
stream.write(VariableBinding.END);
stream.write(VariableBinding.END);
stream.write(VariableBinding.END);
stream.write(VariableBinding.END);
stream.write(Conditional.END);
stream.write(VariableBinding.END);
stream.write(VariableBinding.END);
stream.write(VariableBinding.END);
}
private String decodeItemVariable() {
String[] args = callInfo.getArguments();
if (args.length > 0) {
return args[0];
}
return Syntax.DEFAULT_LIST_ITEM_VAR_NAME;
}
private ExpressionNode parityCheck(ExpressionNode numericExpression, NumericConstant expected) {
return new BinaryOperation(
BinaryOperator.EQ,
new BinaryOperation(BinaryOperator.REM, numericExpression, NumericConstant.TWO),
expected);
}
};
}