MeasureSubscript.ceylon
import ceylon.ast.core {
MeasureSubscript,
AddingExpression
}
import com.redhat.ceylon.compiler.typechecker.tree {
Tree {
JElementRange=ElementRange
}
}
"Converts a RedHat AST [[ElementRange|JElementRange]] to a `ceylon.ast` [[MeasureSubscript]]."
shared MeasureSubscript measureSubscriptToCeylon(JElementRange measureSubscript) {
assert (exists jFrom = measureSubscript.lowerBound,
exists jLength = measureSubscript.length,
!measureSubscript.upperBound exists);
"Check precedence"
assert (is AddingExpression from = expressionToCeylon(jFrom),
is AddingExpression length = expressionToCeylon(jLength));
return MeasureSubscript(from, length);
}
"Compiles the given [[code]] for a Measure Subscript
into a [[MeasureSubscript]] using the Ceylon compiler
(more specifically, the rule for an `indexOrIndexRange`)."
shared MeasureSubscript? compileMeasureSubscript(String code) {
if (is JElementRange jElementOrRange = createParser("[``code``]").indexOrIndexRange().elementOrRange,
jElementOrRange.lowerBound exists,
jElementOrRange.length exists,
!jElementOrRange.upperBound exists) {
return measureSubscriptToCeylon(jElementOrRange);
} else {
return null;
}
}