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gnembon committed 2021-03-08 00:44:40 -04:00
1 parent 36eccbc2df
commit d48f78ff7b
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+118 -166
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src/main/java/carpet/script/exception/Throwables.java
+76 -107
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@@ -1,129 +1,98 @@
package carpet.script.exception;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import carpet.script.value.NullValue;
import carpet.script.value.StringValue;
import carpet.script.value.Value;
import java.util.Set;
/**
* This class contains default Scarpet catchable exception's ids, as well as their inheritance and
* This class contains default Scarpet catchable types, as well as their inheritance and
* methods to check whether filters are compatible with those.
*
* Exceptions here cannot be thrown as an actual {@link Throwable}, they are just part of the metadata for
* {@link ThrowStatement} and {@link ProcessedThrowStatement}
*/
public class Throwables {
protected static final Map<Value, Exception> byValue = new HashMap<>();
public static final Exception EXCEPTION = register("exception", null);
public static final Exception VALUE_EXCEPTION = register("value_exception", EXCEPTION);
public static final Exception UNKNOWN_ITEM = register("unknown_item", VALUE_EXCEPTION);
public static final Exception UNKNOWN_BLOCK = register("unknown_block", VALUE_EXCEPTION);
public static final Exception UNKNOWN_BIOME = register("unknown_biome", VALUE_EXCEPTION);
public static final Exception UNKNOWN_SOUND = register("unknown_sound", VALUE_EXCEPTION);
public static final Exception UNKNOWN_PARTICLE = register("unknown_particle", VALUE_EXCEPTION);
public static final Exception UNKNOWN_POI_TYPE = register("unknown_poi_type", VALUE_EXCEPTION);
public static final Exception UNKNOWN_DIMENSION = register("unknown_dimension", VALUE_EXCEPTION);
public static final Exception UNKNOWN_STRUCTURE = register("unknown_structure", VALUE_EXCEPTION);
public static final Exception UNKNOWN_CRITERION = register("unknown_criterion", VALUE_EXCEPTION);
public static final Exception FILE_READ_EXCEPTION = register("file_read_exception", EXCEPTION);
public static final Exception NBT_READ = register("nbt_read_exception", FILE_READ_EXCEPTION);
public static final Exception JSON_READ = register("json_read_exception", FILE_READ_EXCEPTION);
public static final Exception USER_DEFINED = register("user_defined_exception", EXCEPTION);
protected static final Exception ERROR = register("error", null);
private Throwables() {}
private final String id;
private final Throwables parent;
private static final Map<String, Throwables> byValue = new HashMap<>();
private static final Map<String, Set<Throwables>> handles = new HashMap<>();
public static final Throwables THROWN_EXCEPTION_TYPE = register("exception", null);
public static final Throwables VALUE_EXCEPTION = register("value_exception", THROWN_EXCEPTION_TYPE);
public static final Throwables UNKNOWN_ITEM = register("unknown_item", VALUE_EXCEPTION);
public static final Throwables UNKNOWN_BLOCK = register("unknown_block", VALUE_EXCEPTION);
public static final Throwables UNKNOWN_BIOME = register("unknown_biome", VALUE_EXCEPTION);
public static final Throwables UNKNOWN_SOUND = register("unknown_sound", VALUE_EXCEPTION);
public static final Throwables UNKNOWN_PARTICLE = register("unknown_particle", VALUE_EXCEPTION);
public static final Throwables UNKNOWN_POI_TYPE = register("unknown_poi_type", VALUE_EXCEPTION);
public static final Throwables UNKNOWN_DIMENSION = register("unknown_dimension", VALUE_EXCEPTION);
public static final Throwables UNKNOWN_STRUCTURE = register("unknown_structure", VALUE_EXCEPTION);
public static final Throwables UNKNOWN_CRITERION = register("unknown_criterion", VALUE_EXCEPTION);
public static final Throwables FILE_READ_EXCEPTION = register("file_read_exception", THROWN_EXCEPTION_TYPE);
public static final Throwables NBT_READ = register("nbt_read_exception", FILE_READ_EXCEPTION);
public static final Throwables JSON_READ = register("json_read_exception", FILE_READ_EXCEPTION);
public static final Throwables USER_DEFINED = register("user_defined_exception", THROWN_EXCEPTION_TYPE);
/**
* Creates an exception and registers it to be used as parent for
* user defined exceptions in Scarpet's throw function.
* <p>Scarpet exceptions should, in general, have a top-level parent being {@link Throwables#EXCEPTION}
* @param value The value for the exception as a {@link String}. Will be converted into a {@link StringValue}
* <p>Scarpet exceptions should have a top-level parent being {@link Throwables#THROWN_EXCEPTION_TYPE}
* @param id The value for the exception as a {@link String}.
* @param parent The parent of the exception being created, or <code>null</code> if top-level
* @return The created exception
*/
public static Exception register(String value, Exception parent)
public static Throwables register(String id, Throwables parent)
{
Exception exc = new Exception(value, parent);
byValue.put(exc.getValue(), exc);
Throwables exc = new Throwables(id, parent);
byValue.put(id, exc);
Set<Throwables> itHandles = new HashSet<>();
itHandles.add(exc);
while (parent!=null)
{
handles.get(parent.id).add(exc);
parent = parent.parent;
}
handles.put(id, itHandles);
return exc;
}
/**
* The data of a {@link ThrowStatement} exception. Supports creating with inheritance and
* checking whether a filter is compatible with them.
* Creates a new exception.
* <p>Not suitable for creating exceptions that can't be caught.
* Use an {@link InternalExpressionException} for that
* @param id The exception's value as a {@link String}
*/
public static class Exception {
private final Value value;
private final Exception parent;
private final boolean isError;
/**
* Creates a new exception, with an optional parent.
* <p>To be used in Scarpet's throw command
* <p>Parent will default to {@link Throwables#USER_DEFINED} if provided
* parentValue meets Value#isNull, else it will create a new {@link Exception},
* with its parent being {@link Throwables#USER_DEFINED}.
* <p>If passed parent matches {@link Throwables#ERROR}, it will create an error
* exception, which cannot be caught.
* @param value The {@link Value} of the exception
* @param parentValue An optional {@link Value} matching the name of a parent exception.
* <br>Accepts a {@link NullValue}, but not a {@code null}
*/
public Exception(Value value, Value parentValue)
{
if (byValue.containsKey(value))
throw new InternalExpressionException("Exception value can't be the same as existing exception. Use it as parent instead");
this.value = value;
if (!parentValue.isNull())
{
Exception possibleParent = byValue.get(parentValue);
parent = possibleParent == null ? new Exception(parentValue, Value.NULL) : possibleParent;
} else
parent = USER_DEFINED;
isError = this.parent == ERROR;
}
/**
* Creates a new exception.
* <p>Not suitable for creating exceptions that can't be caught.
* Use an {@link InternalExpressionException} for that
* @param value The exception's value as a {@link String}
* @param parent The parent exception, or <code>null</code> if no parent is available
*/
protected Exception(String value, Exception parent)
{
this.value = StringValue.of(value);
this.parent = parent;
this.isError = false;
}
/**
* Checks whether the given filter matches an instance of this exception, by checking equality
* with itself and possible parents.
* @param filter The {@link Value} to check against
* @return Whether or not the given value matches this exception's hierarchy
*/
public boolean isInstance(Value filter) {
return getValue().equals(filter) || (parent != null && parent.isInstance(filter));
}
/**
* Returns the {@link Value} provided when creating this exception
* @return The {@link Value} of this exception
*/
public Value getValue() {
return value;
}
/**
* Returns whether this exception has been defined as an error.
* <p> Error exceptions cannot be caught in Scarpet
* @return Whether this exception has been defined as an error
*/
public boolean isError() {
return isError;
}
protected Throwables(String id, Throwables parent)
{
this.id = id;
this.parent = parent;
}
public static Throwables getTypeForException(String type)
{
Throwables properType = byValue.get(type);
if (properType == null) throw new InternalExpressionException("Unknown exception type: "+type);
return properType;
}
/**
* Checks whether the given filter matches an instance of this exception, by checking equality
* with itself and possible parents.
* @param filter The type to check against
* @return Whether or not the given value matches this exception's hierarchy
*/
public boolean isRelevantFor(String filter)
{
Set<Throwables> relevantSet = handles.get(filter);
if (relevantSet == null) throw new InternalExpressionException("Unknown exception type: "+filter);
return relevantSet.contains(this);
}
/**
* Returns the throwable type
* @return The type of this exception
*/
public String getId() {
return id;
}
}