icybear/fabric-carpet
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Allow some exceptions to be handled

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altrisi committed 2021-02-19 19:54:41 +01:00
1 parent 7029c6b9b9
commit a155494d11
20 files changed
+283 -78
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src/main/java/carpet/script/language/ControlFlow.java
+32 -4
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@@ -5,7 +5,9 @@ import carpet.script.Expression;
import carpet.script.LazyValue;
import carpet.script.exception.ExitStatement;
import carpet.script.exception.InternalExpressionException;
import carpet.script.exception.ProcessedThrowStatement;
import carpet.script.exception.ThrowStatement;
import carpet.script.value.StringValue;
import carpet.script.value.Value;
public class ControlFlow {
@@ -42,7 +44,20 @@ public class ControlFlow {
expression.addFunction("exit", (lv) -> { throw new ExitStatement(lv.size()==0?Value.NULL:lv.get(0)); });
expression.addFunction("throw", (lv)-> {throw new ThrowStatement(lv.size()==0?Value.NULL:lv.get(0)); });
expression.addLazyFunction("throw", -1, (c, t, lv)->
{
switch (lv.size())
{
case 0:
throw new ThrowStatement("No further information", Value.NULL);
case 1:
throw new ThrowStatement(lv.get(0).evalValue(c));
case 2:
throw new ThrowStatement(lv.get(1).evalValue(c).getString(), lv.get(0).evalValue(c));
default:
throw new InternalExpressionException("throw() can't accept more than 2 parameters");
}
});
expression.addLazyFunction("try", -1, (c, t, lv) ->
{
@@ -53,14 +68,27 @@ public class ControlFlow {
Value retval = lv.get(0).evalValue(c, t);
return (c_, t_) -> retval;
}
catch (ThrowStatement ret)
catch (ProcessedThrowStatement ret)
{
if (lv.size() == 1)
return (c_, t_) -> Value.NULL;
LazyValue __ = c.getVariable("_");
c.setVariable("_", (__c, __t) -> ret.retval.reboundedTo("_"));
Value val = lv.get(1).evalValue(c, t);
c.setVariable("_", (__c, __t) -> ret.exceptionName.reboundedTo("_"));
LazyValue __msg = c.getVariable("_msg");
c.setVariable("_msg", (__c, __t) -> StringValue.of(ret.message).reboundedTo("_msg"));
Value val;
if (lv.size() == 3)
{
if (!ret.exceptionName.equals(lv.get(1).evalValue(c)))
throw ret;
val = lv.get(2).evalValue(c, t);
}
else
{
val = lv.get(1).evalValue(c, t);
}
c.setVariable("_",__);
c.setVariable("_msg", __msg);
return (c_, t_) -> val;
}
});