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FHIRPath defines a "reflection" specification to allow for getting info on the type of an object, and to allow for dynamic access to fields and methods. This commit adds the reflect package to the FHIRPath library which implements part of this functionality. Additionally, to make it traversable, a `Reflect` Namespace object has been included as well.
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| /* | ||
| Package reflect implements §10.2. Reflection from the FHIRPath specification. | ||
| The types defined in this package are a subset of the types defined in the | ||
| Clinical Query Language (CQL) specification, but are limited solely to the usage | ||
| within FHIRPath. | ||
| See https://hl7.org/fhirpath/N1/#reflection for more information. | ||
| */ | ||
| package reflect | ||
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| // TypeSpecifier represents a reflection of a FHIRPath type specifier. | ||
| // | ||
| // Type specifier may name either FHIR or System-namespaced types, and may be | ||
| // either scalar or list values. In most FHIRPath applications, these will only | ||
| // ever be seen as scalar type values corresponding to the underlying resource or | ||
| // element. Lists are a byproduct that only present itself during reflection | ||
| // operations, but otherwise should never be seen in expressions. | ||
| type TypeSpecifier string | ||
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| // Info represents a reflection of a FHIRPath type. | ||
| type Info interface { | ||
| isInfo() | ||
| } | ||
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| // InfoElement represents an element from a reflection of a FHIRPath type. | ||
| type InfoElement interface { | ||
| isInfoElement() | ||
| } | ||
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| // SimpleTypeInfo is a Go implementation of §10.2.1 "Primitive Types" from | ||
| // the FHIRPath specification. | ||
| // | ||
| // See: https://hl7.org/fhirpath/N1/#primitive-types | ||
| type SimpleTypeInfo struct { | ||
| Namespace string `json:"namespace" yaml:"namespace" fhirpath:"namespace"` | ||
| Name string `json:"name" yaml:"name" fhirpath:"name"` | ||
| BaseType TypeSpecifier `json:"baseType" yaml:"baseType" fhirpath:"baseType"` | ||
| } | ||
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| func (SimpleTypeInfo) isInfo() {} | ||
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| var _ Info = (*SimpleTypeInfo)(nil) | ||
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| // ClassInfoElement is a Go implementation of §10.2.2 "Class Types" from | ||
| // the FHIRPath specification. | ||
| // | ||
| // This is a compound type that is built into larger structures in the | ||
| // [ClassInfo] type. | ||
| // | ||
| // See https://hl7.org/fhirpath/N1/#class-types | ||
| type ClassInfoElement struct { | ||
| Name string `json:"name" yaml:"name" fhirpath:"name"` | ||
| Type TypeSpecifier `json:"type" yaml:"type" fhirpath:"type"` | ||
| IsOneBased bool `json:"isOneBased" yaml:"isOneBased" fhirpath:"isOneBased"` | ||
| } | ||
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| func (ClassInfoElement) isInfoElement() {} | ||
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| // ClassInfo is a Go implementation of §10.2.2 "Class Types" from | ||
| // the FHIRPath specification. | ||
| // | ||
| // See https://hl7.org/fhirpath/N1/#class-types | ||
| type ClassInfo struct { | ||
| Namespace string `json:"namespace" yaml:"namespace" fhirpath:"namespace"` | ||
| Name string `json:"name" yaml:"name" fhirpath:"name"` | ||
| BaseType TypeSpecifier `json:"baseType" yaml:"baseType" fhirpath:"baseType"` | ||
| Element []ClassInfoElement `json:"element" yaml:"element" fhirpath:"element"` | ||
| } | ||
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| func (ClassInfo) isInfo() {} | ||
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| var _ Info = (*ClassInfo)(nil) | ||
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| // ListTypeInfo is a Go implementation of §10.2.3 "Collection Types" from | ||
| // the FHIRPath specification. | ||
| // | ||
| // See https://hl7.org/fhirpath/N1/#collection-types | ||
| type ListTypeInfo struct { | ||
| ElementType TypeSpecifier `json:"elementType" yaml:"elementType" fhirpath:"elementType"` | ||
| } | ||
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| func (ListTypeInfo) isInfo() {} | ||
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| var _ Info = (*ListTypeInfo)(nil) | ||
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| // TupleTypeInfoElement is a Go implementation of §10.2.4 "Anonymous Types" from | ||
| // the FHIRPath specification. | ||
| // | ||
| // This is a compound type that is built into larger structures in the | ||
| // [TupleTypeInfo] type. | ||
| // | ||
| // See https://hl7.org/fhirpath/N1/#anonymous-types | ||
| type TupleTypeInfoElement struct { | ||
| Name string `json:"name" yaml:"name" fhirpath:"name"` | ||
| Type TypeSpecifier `json:"type" yaml:"type" fhirpath:"type"` | ||
| IsOneBased bool `json:"isOneBased" yaml:"isOneBased" fhirpath:"isOneBased"` | ||
| } | ||
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| func (TupleTypeInfoElement) isInfoElement() {} | ||
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| var _ InfoElement = (*TupleTypeInfoElement)(nil) | ||
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| // TupleTypeInfo is a Go implementation of §10.2.4 "Anonymous Types" from | ||
| // the FHIRPath specification. | ||
| // | ||
| // See https://hl7.org/fhirpath/N1/#anonymous-types | ||
| type TupleTypeInfo struct { | ||
| Element []TupleTypeInfoElement `json:"element" yaml:"element" fhirpath:"element"` | ||
| } | ||
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| func (TupleTypeInfo) isInfo() {} | ||
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| var _ Info = (*TupleTypeInfo)(nil) |