[SE-0211] Add Unicode properties to Unicode.Scalar

stdlib/public/SwiftShims/UnicodeShims.h

@@ -373,6 +373,63 @@ typedef enum __swift_stdlib_UBreakIteratorType {
   __swift_stdlib_UBRK_COUNT = 5
 } __swift_stdlib_UBreakIteratorType;
 
+typedef enum __swift_stdlib_UCharCategory {
+  __swift_stdlib_U_UNASSIGNED              = 0,
+  __swift_stdlib_U_GENERAL_OTHER_TYPES     = 0,
+  __swift_stdlib_U_UPPERCASE_LETTER        = 1,
+  __swift_stdlib_U_LOWERCASE_LETTER        = 2,
+  __swift_stdlib_U_TITLECASE_LETTER        = 3,
+  __swift_stdlib_U_MODIFIER_LETTER         = 4,
+  __swift_stdlib_U_OTHER_LETTER            = 5,
+  __swift_stdlib_U_NON_SPACING_MARK        = 6,
+  __swift_stdlib_U_ENCLOSING_MARK          = 7,
+  __swift_stdlib_U_COMBINING_SPACING_MARK  = 8,
+  __swift_stdlib_U_DECIMAL_DIGIT_NUMBER    = 9,
+  __swift_stdlib_U_LETTER_NUMBER           = 10,
+  __swift_stdlib_U_OTHER_NUMBER            = 11,
+  __swift_stdlib_U_SPACE_SEPARATOR         = 12,
+  __swift_stdlib_U_LINE_SEPARATOR          = 13,
+  __swift_stdlib_U_PARAGRAPH_SEPARATOR     = 14,
+  __swift_stdlib_U_CONTROL_CHAR            = 15,
+  __swift_stdlib_U_FORMAT_CHAR             = 16,
+  __swift_stdlib_U_PRIVATE_USE_CHAR        = 17,
+  __swift_stdlib_U_SURROGATE               = 18,
+  __swift_stdlib_U_DASH_PUNCTUATION        = 19,
+  __swift_stdlib_U_START_PUNCTUATION       = 20,
+  __swift_stdlib_U_END_PUNCTUATION         = 21,
+  __swift_stdlib_U_CONNECTOR_PUNCTUATION   = 22,
+  __swift_stdlib_U_OTHER_PUNCTUATION       = 23,
+  __swift_stdlib_U_MATH_SYMBOL             = 24,
+  __swift_stdlib_U_CURRENCY_SYMBOL         = 25,
+  __swift_stdlib_U_MODIFIER_SYMBOL         = 26,
+  __swift_stdlib_U_OTHER_SYMBOL            = 27,
+  __swift_stdlib_U_INITIAL_PUNCTUATION     = 28,
+  __swift_stdlib_U_FINAL_PUNCTUATION       = 29,
+  __swift_stdlib_U_CHAR_CATEGORY_COUNT
+} __swift_stdlib_UCharCategory;
+
+typedef enum __swift_stdlib_UCharNameChoice {
+  __swift_stdlib_U_UNICODE_CHAR_NAME,
+#ifndef U_HIDE_DEPRECATED_API
+  __swift_stdlib_U_UNICODE_10_CHAR_NAME,
+#endif
+  __swift_stdlib_U_EXTENDED_CHAR_NAME = __swift_stdlib_U_UNICODE_CHAR_NAME + 2,
+  __swift_stdlib_U_CHAR_NAME_ALIAS,
+#ifndef U_HIDE_DEPRECATED_API
+  __swift_stdlib_U_CHAR_NAME_CHOICE_COUNT
+#endif
+} __swift_stdlib_UCharNameChoice;
+
+typedef enum __swift_stdlib_UNumericType {
+  __swift_stdlib_U_NT_NONE,
+  __swift_stdlib_U_NT_DECIMAL,
+  __swift_stdlib_U_NT_DIGIT,
+  __swift_stdlib_U_NT_NUMERIC,
+#ifndef U_HIDE_DEPRECATED_API
+  __swift_stdlib_U_NT_COUNT
+#endif
+} __swift_stdlib_UNumericType;
+
 typedef struct __swift_stdlib_UBreakIterator __swift_stdlib_UBreakIterator;
 typedef struct __swift_stdlib_UNormalizer2 __swift_stdlib_UNormalizer2;
 typedef __swift_int8_t __swift_stdlib_UBool;
@@ -386,6 +443,9 @@ typedef char16_t __swift_stdlib_UChar;
 typedef __swift_uint16_t __swift_stdlib_UChar;
 #endif
 #endif
+#define __SWIFT_STDLIB_U_MAX_VERSION_LENGTH 4
+typedef __swift_uint8_t
+    __swift_stdlib_UVersionInfo[__SWIFT_STDLIB_U_MAX_VERSION_LENGTH];
 
 SWIFT_RUNTIME_STDLIB_INTERFACE
 void __swift_stdlib_ubrk_close(__swift_stdlib_UBreakIterator *bi);
@@ -437,10 +497,43 @@ SWIFT_RUNTIME_STDLIB_INTERFACE
 __swift_stdlib_UBool
     __swift_stdlib_u_hasBinaryProperty(__swift_stdlib_UChar32,
                                        __swift_stdlib_UProperty);
+
 SWIFT_RUNTIME_STDLIB_INTERFACE
-__swift_stdlib_UBool
-    __swift_stdlib_u_isdefined(__swift_stdlib_UChar32);
+void __swift_stdlib_u_charAge(
+    __swift_stdlib_UChar32, __swift_stdlib_UVersionInfo _Nonnull);
+
+SWIFT_RUNTIME_STDLIB_INTERFACE
+__swift_int32_t
+    __swift_stdlib_u_getIntPropertyValue(__swift_stdlib_UChar32,
+                                         __swift_stdlib_UProperty);
+
+SWIFT_RUNTIME_STDLIB_INTERFACE
+__swift_int32_t __swift_stdlib_u_charName(
+    __swift_stdlib_UChar32 code, __swift_stdlib_UCharNameChoice nameChoice,
+    char *_Nullable buffer, __swift_int32_t bufferLength,
+    __swift_stdlib_UErrorCode *pErrorCode);
+
+SWIFT_RUNTIME_STDLIB_INTERFACE
+__swift_int32_t __swift_stdlib_u_strToLower(
+    __swift_stdlib_UChar *dest, __swift_int32_t destCapacity,
+    const __swift_stdlib_UChar *src, __swift_int32_t srcLength,
+    const char *locale, __swift_stdlib_UErrorCode *pErrorCode);
 
+SWIFT_RUNTIME_STDLIB_INTERFACE
+__swift_int32_t __swift_stdlib_u_strToTitle(
+    __swift_stdlib_UChar *dest, __swift_int32_t destCapacity,
+    const __swift_stdlib_UChar *src, __swift_int32_t srcLength,
+    __swift_stdlib_UBreakIterator *_Nullable titleIter, const char *locale,
+    __swift_stdlib_UErrorCode *pErrorCode);
+
+SWIFT_RUNTIME_STDLIB_INTERFACE
+__swift_int32_t __swift_stdlib_u_strToUpper(
+    __swift_stdlib_UChar *dest, __swift_int32_t destCapacity,
+    const __swift_stdlib_UChar *src, __swift_int32_t srcLength,
+    const char *locale, __swift_stdlib_UErrorCode *pErrorCode);
+
+SWIFT_RUNTIME_STDLIB_INTERFACE
+double __swift_stdlib_u_getNumericValue(__swift_stdlib_UChar32 c);
 
 
 #ifdef __cplusplus

stdlib/public/core/CMakeLists.txt

@@ -150,6 +150,7 @@ set(SWIFTLIB_ESSENTIAL
   UnavailableStringAPIs.swift.gyb
   UnicodeEncoding.swift
   UnicodeParser.swift
+  UnicodeScalarProperties.swift
   Unmanaged.swift
   UnmanagedOpaqueString.swift
   UnmanagedString.swift

stdlib/public/core/GroupInfo.json

@@ -39,6 +39,7 @@
     "UnicodeEncoding.swift",
     "UnicodeParser.swift",
     "UnicodeScalar.swift",
+    "UnicodeScalarProperties.swift",
     "UnavailableStringAPIs.swift",
     "UnmanagedOpaqueString.swift",
     "UnmanagedString.swift",

stdlib/public/core/String.swift

@@ -742,6 +742,18 @@ extension String {
   ) -> String {
     return String._fromUTF8(input, repair: repair)!
   }
+
+  @inlinable
+  @usableFromInline
+  static func _fromWellFormedUTF16CodeUnits<C : RandomAccessCollection>(
+    _ input: C, repair: Bool = false
+  ) -> String where C.Element == UTF16.CodeUnit {
+    if let smol = _SmallUTF8String(input) {
+      return String(_StringGuts(smol))
+    }
+    return String._fromCodeUnits(
+      input, encoding: UTF16.self, repairIllFormedSequences: repair)!
+  }
 }
 
 extension String : _ExpressibleByBuiltinUnicodeScalarLiteral {

stdlib/public/core/StringComparison.swift

@@ -835,10 +835,10 @@ private struct _UnicodeScalarExceptions {
       guard let scalar = UnicodeScalar(rawValue) else { continue }
 
       // Fast path: skip unassigned code points
-      guard scalar._isDefined else { continue }
+      guard scalar.properties.generalCategory != .unassigned else { continue }
 
       // Fast path: skip unless QC_FCD=no
-      if _fastPath(!scalar._hasFullCompExclusion) {
+      if _fastPath(!scalar.properties.isFullCompositionExclusion) {
         continue
       }
 

stdlib/public/core/StringNormalization.swift

@@ -88,23 +88,6 @@ extension UnicodeScalar {
     return 0 != __swift_stdlib_unorm2_hasBoundaryBefore(
       _Normalization._nfcNormalizer, value)
   }
-
-  // Whether the supported version of Unicode has assigned a code point to this
-  // value.
-  internal var _isDefined: Bool {
-    return __swift_stdlib_u_isdefined(Int32(self.value)) != 0
-  }
-
-  // A property tracked in ICU regarding the scalar's potential non-normality;
-  // this is equivalent to whether quickCheck=NO. A subset of such scalars may
-  // expand under NFC normalization, and a subset of those may expand into
-  // multiple segments.
-  internal var _hasFullCompExclusion: Bool {
-    _sanityCheck(Int32(exactly: self.value) != nil, "top bit shouldn't be set")
-    let value = Int32(bitPattern: self.value)
-    let prop = __swift_stdlib_UCHAR_FULL_COMPOSITION_EXCLUSION
-    return __swift_stdlib_u_hasBinaryProperty(value, prop) != 0
-  }
 }
 
 extension _Normalization {