Initial commit: Go 1.23 release state

test/utf.go

@@ -0,0 +1,66 @@
+// run
+
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Test UTF-8 in strings and character constants.
+
+package main
+
+import "unicode/utf8"
+
+func main() {
+	var chars [6]rune
+	chars[0] = 'a'
+	chars[1] = 'b'
+	chars[2] = 'c'
+	chars[3] = '\u65e5'
+	chars[4] = '\u672c'
+	chars[5] = '\u8a9e'
+	s := ""
+	for i := 0; i < 6; i++ {
+		s += string(chars[i])
+	}
+	var l = len(s)
+	for w, i, j := 0, 0, 0; i < l; i += w {
+		var r rune
+		r, w = utf8.DecodeRuneInString(s[i:len(s)])
+		if w == 0 {
+			panic("zero width in string")
+		}
+		if r != chars[j] {
+			panic("wrong value from string")
+		}
+		j++
+	}
+	// encoded as bytes:  'a' 'b' 'c' e6 97 a5 e6 9c ac e8 aa 9e
+	const L = 12
+	if L != l {
+		panic("wrong length constructing array")
+	}
+	a := make([]byte, L)
+	a[0] = 'a'
+	a[1] = 'b'
+	a[2] = 'c'
+	a[3] = 0xe6
+	a[4] = 0x97
+	a[5] = 0xa5
+	a[6] = 0xe6
+	a[7] = 0x9c
+	a[8] = 0xac
+	a[9] = 0xe8
+	a[10] = 0xaa
+	a[11] = 0x9e
+	for w, i, j := 0, 0, 0; i < L; i += w {
+		var r rune
+		r, w = utf8.DecodeRune(a[i:L])
+		if w == 0 {
+			panic("zero width in bytes")
+		}
+		if r != chars[j] {
+			panic("wrong value from bytes")
+		}
+		j++
+	}
+}