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Generate complete static case fold orbits #206

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Generate complete static case fold orbits #206

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453ec04
Updated Unicode tables to Unicode 10
sjamesr Aug 29, 2023
31dd153
Generate complete static case fold orbits
ittaigolde May 30, 2026
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4 changes: 2 additions & 2 deletions build.gradle
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Original file line number Diff line number Diff line change
Expand Up @@ -30,8 +30,8 @@ wrapper {
gradleVersion '5.2'
}

sourceCompatibility = 1.6
targetCompatibility = 1.6
sourceCompatibility = 1.8
targetCompatibility = 1.8

repositories {
mavenCentral()
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21 changes: 8 additions & 13 deletions java/com/google/re2j/Unicode.java
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Expand Up @@ -28,7 +28,7 @@ class Unicode {
// Minimum and maximum runes involved in folding.
// Checked during test.
static final int MIN_FOLD = 0x0041;
static final int MAX_FOLD = 0x1044f;
static final int MAX_FOLD = 0x1E943;

// is32 uses binary search to test whether rune is in the specified
// slice of 32-bit ranges.
Expand Down Expand Up @@ -107,19 +107,14 @@ static boolean isPrint(int r) {
// Derived from Go's unicode.SimpleFold.
//
static int simpleFold(int r) {
// Consult caseOrbit table for special cases.
if (r < UnicodeTables.CASE_ORBIT.length && UnicodeTables.CASE_ORBIT[r] != 0) {
return UnicodeTables.CASE_ORBIT[r];
}

// No folding specified. This is a one- or two-element
// equivalence class containing rune and toLower(rune)
// and toUpper(rune) if they are different from rune.
int l = Characters.toLowerCase(r);
if (l != r) {
return l;
// Consult caseOrbit table.
if (r < UnicodeTables.CASE_ORBIT.length << 8) {
int[] page = UnicodeTables.CASE_ORBIT[r >> 8];
if (page != null && page[r & 0xff] != 0) {
return page[r & 0xff];
}
}
return Characters.toUpperCase(r);
return r;
}

// equalsIgnoreCase performs case-insensitive equality comparison
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