OutModifier.ceylon
import ceylon.ast.core {
Node,
OutModifier
}
import com.redhat.ceylon.compiler.typechecker.tree {
JNode=Node,
Tree {
JTypeVariance=TypeVariance
}
}
import com.redhat.ceylon.compiler.typechecker.parser {
CeylonLexer {
outType=\iOUT
}
}
"Converts a RedHat AST [[TypeVariance|JTypeVariance]]
with token type [[`OUT`|outType]]
to a `ceylon.ast` [[OutModifier]]."
shared OutModifier outModifierToCeylon(JTypeVariance outModifier, Anything(JNode,Node) update = noop) {
"Must be an ‘in’ modifier"
assert (outModifier.mainToken.type == outType);
value result = OutModifier();
update(outModifier, result);
return result;
}
"Compiles the given [[code]] for an Out Modifier
into an [[OutModifier]] using the Ceylon compiler
(more specifically, the rule for a `variance`)."
shared OutModifier? compileOutModifier(String code, Anything(JNode,Node) update = noop) {
if (exists jVariance = createParser(code).variance(),
jVariance.mainToken.type == outType) {
return outModifierToCeylon(jVariance, update);
} else {
return null;
}
}