@testable import PureXML
import Testing
@Suite("XSD Particle Valid (Restriction)")
struct XSDParticleRestrictionTests {
private let xsNamespace = "xmlns:xs=\"http://www.w3.org/2001/XMLSchema\""
private func schema(base: String, restriction: String) -> String {
"""
\(base)
\(restriction)
"""
}
private func compiles(base: String, restriction: String) -> Bool {
(try? PureXML.Schema.Document(schema(base: base, restriction: restriction))) != nil
}
private func restrictionError(base: String, restriction: String) -> String? {
do {
_ = try PureXML.Schema.Document(schema(base: base, restriction: restriction))
return nil
} catch let error as PureXML.Schema.SchemaError {
return String(describing: error)
} catch {
return String(describing: error)
}
}
@Test("Valid restrictions compile: drop an optional, narrow a choice, keep order")
func test_validRestrictions() {
// Dropping an optional element.
#expect(compiles(
base: "",
restriction: "",
))
// Narrowing a choice to one branch.
#expect(compiles(
base: "",
restriction: "",
))
// Narrowing an occurrence range.
#expect(compiles(
base: "",
restriction: "",
))
}
@Test("A restriction widening the occurrence range is rejected")
func test_wideningOccurrenceRejected() {
let error = restrictionError(
base: "",
restriction: "",
)
#expect(error?.contains("not a valid restriction") == true, "\(String(describing: error))")
}
@Test("A restriction introducing a new element name is rejected")
func test_newNameRejected() {
let error = restrictionError(
base: "",
restriction: "",
)
#expect(error?.contains("not a valid restriction") == true)
}
@Test("A restriction reordering a sequence is rejected")
func test_reorderRejected() {
let error = restrictionError(
base: "",
restriction: "",
)
#expect(error?.contains("not a valid restriction") == true)
}
@Test("Restricting to empty requires an emptiable base")
func test_emptyRestriction() {
// Emptiable base: fine.
#expect(compiles(
base: "",
restriction: "",
))
// Required base content: rejected.
let error = restrictionError(
base: "",
restriction: "",
)
#expect(error?.contains("cannot be EMPTY") == true, "\(String(describing: error))")
}
@Test("An element restricts a wildcard only when its namespace is admitted")
func test_wildcardRestriction() {
// ##any admits the unqualified element.
#expect(compiles(
base: "",
restriction: "",
))
// ##other refuses an unqualified element.
let error = restrictionError(
base: "",
restriction: "",
)
#expect(error?.contains("not a valid restriction") == true)
}
@Test("Conformance: the restriction corpus passes through the harness")
func test_conformanceCases() {
let valid = compiles(
base: "",
restriction: "",
)
let invalid = compiles(
base: "",
restriction: "",
)
let cases = [
PureXML.Validation.ConformanceCase(name: "faithful-restriction-accepted", actual: valid ? "valid" : "invalid", expected: "valid"),
PureXML.Validation.ConformanceCase(name: "additive-restriction-rejected", actual: invalid ? "valid" : "invalid", expected: "invalid"),
]
let failures = PureXML.Validation.Conformance.failures(in: cases)
#expect(failures.isEmpty, "\(failures.map(\.reason))")
}
@Test("NameAndTypeOK: a same-name element must keep a type that derives from the base's")
func test_elementTypeDerivation() {
// Renaming the element's type to an incompatible one (string -> int) is not a
// valid restriction: int does not derive from string.
#expect(!compiles(
base: "",
restriction: "",
))
// Narrowing to a derived type (integer -> int) is valid.
#expect(compiles(
base: "",
restriction: "",
))
// Keeping the same type is valid.
#expect(compiles(
base: "",
restriction: "",
))
}
@Test("NameAndTypeOK: widening a concrete-typed element to the ur-type is rejected")
func test_elementUrTypeWidening() {
// Restricting a string element to anyType/anySimpleType is widening, invalid.
#expect(!compiles(
base: "",
restriction: "",
))
#expect(!compiles(
base: "",
restriction: "",
))
// The reverse (base is the ur-type, restriction narrows it) is valid.
#expect(compiles(
base: "",
restriction: "",
))
// A user type whose local name is "anyType" (not the XSD ur-type) must not be
// mistaken for it: this is a valid same-type restriction.
#expect((try? PureXML.Schema.Document("""
""")) != nil)
}
@Test("NameAndTypeOK over named user and union types")
func test_elementUserTypeDerivation() {
func doc(_ elementC1: String, base baseC1: String, types: String) -> PureXML.Schema.Document? {
try? PureXML.Schema.Document("""
\(types)
""")
}
let userTypes = """
"""
// bar restricts foo: a valid narrowing of a user type.
#expect(doc("bar", base: "foo", types: userTypes) != nil)
// foo restricting bar widens (foo is bar's base): invalid.
#expect(doc("foo", base: "bar", types: userTypes) == nil)
// two unrelated user types: invalid.
#expect(doc("other", base: "foo", types: userTypes) == nil)
// a union member (xs:string) validly restricts the union-typed base element.
#expect(doc("xs:string", base: "u", types: userTypes) != nil)
}
}