// ENUM_VAL_INITIALIZER -> INTEGER_LITERAL | ENUM_VALUE_REF
// ENUM_VALUE_REF -> IDENTIFIER {{that resolves to a declared enum value}}
func (p *Parser) parseEnumValueInitializer(mojoEnum *mojom.MojomEnum) mojom.ValueRef {
if !p.OK() {
return nil
}
p.pushChildNode("enumValueInitializer")
defer p.popNode()
// We need to manufacture an instance of Type to act as the "assigneeType"
// for the new ValueSpec we are creating. This is because unlike
// other types of value assignment, an enum value initializer is not
// preceded by a type reference for the assignee. Rather the type of
// the assignee is implicit in the scope.
enumType := mojom.NewResolvedUserTypeRef(mojoEnum.FullyQualifiedName(), mojoEnum)
valueToken := p.peekNextToken("Parsing an enum value initializer type.")
valueRef := p.parseValue(enumType)
if valueRef == nil {
return nil
}
if !valueRef.MarkUsedAsEnumValueInitializer() {
message := fmt.Sprintf("Illegal value: %s at %s. An enum value may "+
"only be initialized by an integer or another enum value.", valueToken,
valueToken.LongLocationString())
p.err = &ParseError{ParserErrorCodeUnexpectedToken, message}
return nil
}
return valueRef
}
