package railo.transformer.cfml.evaluator.impl;
import railo.commons.lang.StringUtil;
import railo.transformer.bytecode.cast.Cast;
import railo.transformer.bytecode.cast.CastString;
import railo.transformer.bytecode.expression.Expression;
import railo.transformer.bytecode.expression.var.Variable;
import railo.transformer.bytecode.expression.var.VariableString;
import railo.transformer.bytecode.literal.LitString;
import railo.transformer.bytecode.statement.tag.Attribute;
import railo.transformer.bytecode.statement.tag.Tag;
import railo.transformer.bytecode.statement.tag.TagBreak;
import railo.transformer.bytecode.util.ASMUtil;
import railo.transformer.cfml.evaluator.EvaluatorException;
import railo.transformer.cfml.evaluator.EvaluatorSupport;
import railo.transformer.library.tag.TagLibTag;
/**
* Prueft den Kontext des Tag break.
* Das Tag <code>break</code> darf nur innerhalb des Tag <code>loop, while, foreach</code> liegen.
*/
public final class Break extends EvaluatorSupport {
@Override
public void evaluate(Tag tag,TagLibTag libTag) throws EvaluatorException {
String ns=libTag.getTagLib().getNameSpaceAndSeparator();
String loopName=ns+"loop";
String whileName=ns+"while";
// label
String label=null;
Attribute attrLabel = tag.getAttribute("label");
if(attrLabel!=null){
TagBreak tb=(TagBreak) tag;
label=variableToString(tag,attrLabel,null);
if(label!=null){
tb.setLabel(label=label.trim());
tag.removeAttribute("label");
}
else if(ASMUtil.isLiteralAttribute(tag, attrLabel, ASMUtil.TYPE_STRING, false, true)) {
LitString ls=(LitString) CastString.toExprString(tag.getAttribute("label").getValue());
label = ls.getString();
if(!StringUtil.isEmpty(label,true)) {
tb.setLabel(label=label.trim());
tag.removeAttribute("label");
}
else label=null;
}
}
// no base tag found
if(!ASMUtil.hasAncestorBreakFCStatement(tag,label)) {
if(tag.isScriptBase()) {
if(StringUtil.isEmpty(label))
throw new EvaluatorException("Wrong Context, "+libTag.getName()+" must be inside a looping statement or tag");
throw new EvaluatorException("Wrong Context, "+libTag.getName()+" must be inside a looping statement or tag with the label ["+label+"]");
}
if(StringUtil.isEmpty(label))
throw new EvaluatorException("Wrong Context, tag "+libTag.getFullName()+" must be inside a "+loopName+" or "+whileName+" tag");
throw new EvaluatorException("Wrong Context, tag "+libTag.getFullName()+" must be inside a "+loopName+" or "+whileName+" tag with the label ["+label+"]");
}
}
static String variableToString(Tag tag, Attribute attrLabel, String defaultValue) {
Expression value = attrLabel.getValue();
while(value instanceof Cast) value=((Cast)value).getExpr();
if(value instanceof Variable) {
Variable var=(Variable)value;
try {
return VariableString.variableToString(var, true);
} catch (Throwable t) {}
}
return defaultValue;
}
}