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Dynamic scripting for the JVM
package org.snapscript.tree.function;
import org.snapscript.core.Evaluation;
import org.snapscript.core.InternalStateException;
import org.snapscript.core.Scope;
import org.snapscript.core.Type;
import org.snapscript.core.Value;
import org.snapscript.core.function.Parameter;
import org.snapscript.tree.Modifier;
import org.snapscript.tree.ModifierChecker;
import org.snapscript.tree.ModifierList;
import org.snapscript.tree.NameReference;
import org.snapscript.tree.annotation.AnnotationList;
import org.snapscript.tree.constraint.Constraint;
public class ParameterDeclaration {
private AnnotationList annotations;
private ModifierChecker checker;
private NameReference reference;
private Constraint constraint;
private Parameter parameter;
private Modifier modifier;
public ParameterDeclaration(AnnotationList annotations, ModifierList modifiers, Evaluation identifier){
this(annotations, modifiers, identifier, null, null);
}
public ParameterDeclaration(AnnotationList annotations, ModifierList modifiers, Evaluation identifier, Constraint constraint){
this(annotations, modifiers, identifier, null, constraint);
}
public ParameterDeclaration(AnnotationList annotations, ModifierList modifiers, Evaluation identifier, Modifier modifier){
this(annotations, modifiers, identifier, modifier, null);
}
public ParameterDeclaration(AnnotationList annotations, ModifierList modifiers, Evaluation identifier, Modifier modifier, Constraint constraint){
this.reference = new NameReference(identifier);
this.checker = new ModifierChecker(modifiers);
this.annotations = annotations;
this.constraint = constraint;
this.modifier = modifier;
}
public Parameter get(Scope scope) throws Exception {
if(parameter == null) {
parameter = create(scope);
if(parameter != null) {
annotations.apply(scope, parameter);
}
}
return parameter;
}
private Parameter create(Scope scope) throws Exception {
String name = reference.getName(scope);
boolean constant = checker.isConstant();
if(constraint != null && name != null) {
Value value = constraint.evaluate(scope, null);
Type type = value.getValue();
if(type == null) {
throw new InternalStateException("Constraint for '" +name + "' has not been imported");
}
return new Parameter(name, type, constant, modifier != null);
}
return new Parameter(name, null, constant, modifier != null);
}
}