utf8 routines in go; a start.

also:
	* parse flags in testing.Main.
	* add make test in src/lib.

R=r
DELTA=323  (323 added, 0 deleted, 0 changed)
OCL=19831
CL=19850

1 files changed, 150 insertions, 0 deletions

diff --git a/src/lib/utf8_test.go b/src/lib/utf8_test.go
new file mode 100644
index 000000000..550f4ba14
--- /dev/null
+++ b/src/lib/utf8_test.go
@@ -0,0 +1,150 @@
+// 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.
+
+package utf8
+
+import (
+	"fmt";
+	"syscall";
+	"testing";
+	"utf8";
+)
+
+type Utf8Map struct {
+	rune int;
+	str string;
+}
+
+var utf8map = []Utf8Map {
+	Utf8Map{ 0x0000, "\x00" },
+	Utf8Map{ 0x0001, "\x01" },
+	Utf8Map{ 0x007e, "\x7e" },
+	Utf8Map{ 0x007f, "\x7f" },
+	Utf8Map{ 0x0080, "\xc2\x80" },
+	Utf8Map{ 0x0081, "\xc2\x81" },
+	Utf8Map{ 0x00bf, "\xc2\xbf" },
+	Utf8Map{ 0x00c0, "\xc3\x80" },
+	Utf8Map{ 0x00c1, "\xc3\x81" },
+	Utf8Map{ 0x00c8, "\xc3\x88" },
+	Utf8Map{ 0x00d0, "\xc3\x90" },
+	Utf8Map{ 0x00e0, "\xc3\xa0" },
+	Utf8Map{ 0x00f0, "\xc3\xb0" },
+	Utf8Map{ 0x00f8, "\xc3\xb8" },
+	Utf8Map{ 0x00ff, "\xc3\xbf" },
+	Utf8Map{ 0x0100, "\xc4\x80" },
+	Utf8Map{ 0x07ff, "\xdf\xbf" },
+	Utf8Map{ 0x0800, "\xe0\xa0\x80" },
+	Utf8Map{ 0x0801, "\xe0\xa0\x81" },
+	Utf8Map{ 0xfffe, "\xef\xbf\xbe" },
+	Utf8Map{ 0xffff, "\xef\xbf\xbf" },
+	Utf8Map{ 0x10000, "\xf0\x90\x80\x80" },
+	Utf8Map{ 0x10001, "\xf0\x90\x80\x81" },
+	Utf8Map{ 0x10fffe, "\xf4\x8f\xbf\xbe" },
+	Utf8Map{ 0x10ffff, "\xf4\x8f\xbf\xbf" },
+}
+
+func CEscape(s *[]byte) string {
+	t := "\"";
+	for i := 0; i < len(s); i++ {
+		switch {
+		case s[i] == '\\' || s[i] == '"':
+			t += `\`;
+			t += string(s[i]);
+		case s[i] == '\n':
+			t += `\n`;
+		case s[i] == '\t':
+			t += `\t`;
+		case ' ' <= s[i] && s[i] <= '~':
+			t += string(s[i]);
+		default:
+			t += fmt.sprintf(`\x%02x`, s[i]);
+		}
+	}
+	t += "\"";
+	return t;
+}
+
+func Bytes(s string) *[]byte {
+	b := new([]byte, len(s)+1);
+	if !syscall.StringToBytes(b, s) {
+		panic("StringToBytes failed");
+	}
+	return b[0:len(s)];
+}
+
+export func TestFullRune(t *testing.T) {
+	for i := 0; i < len(utf8map); i++ {
+		m := utf8map[i];
+		b := Bytes(m.str);
+		if !utf8.FullRune(b) {
+			t.Errorf("FullRune(%s) (rune %04x) = false, want true", CEscape(b), m.rune);
+		}
+		if b1 := b[0:len(b)-1]; utf8.FullRune(b1) {
+			t.Errorf("FullRune(%s) = true, want false", CEscape(b1));
+		}
+	}
+}
+
+func EqualBytes(a, b *[]byte) bool {
+	if len(a) != len(b) {
+		return false;
+	}
+	for i := 0; i < len(a); i++ {
+		if a[i] != b[i] {
+			return false;
+		}
+	}
+	return true;
+}
+
+export func TestEncodeRune(t *testing.T) {
+	for i := 0; i < len(utf8map); i++ {
+		m := utf8map[i];
+		b := Bytes(m.str);
+		var buf [10]byte;
+		n := utf8.EncodeRune(m.rune, &buf);
+		b1 := (&buf)[0:n];
+		if !EqualBytes(b, b1) {
+			t.Errorf("EncodeRune(0x%04x) = %s want %s", m.rune, CEscape(b1), CEscape(b));
+		}
+	}
+}
+
+export func TestDecodeRune(t *testing.T) {
+	for i := 0; i < len(utf8map); i++ {
+		m := utf8map[i];
+		b := Bytes(m.str);
+		rune, size := utf8.DecodeRune(b);
+		if rune != m.rune || size != len(b) {
+			t.Errorf("DecodeRune(%s) = 0x%04x, %d want 0x%04x, %d", CEscape(b), rune, size, m.rune, len(b));
+		}
+
+		// there's an extra byte that Bytes left behind - make sure trailing byte works
+		rune, size = utf8.DecodeRune(b[0:cap(b)]);
+		if rune != m.rune || size != len(b) {
+			t.Errorf("DecodeRune(%s) = 0x%04x, %d want 0x%04x, %d", CEscape(b), rune, size, m.rune, len(b));
+		}
+
+		// make sure missing bytes fail
+		rune, size = utf8.DecodeRune(b[0:len(b)-1]);
+		wantsize := 1;
+		if wantsize >= len(b) {
+			wantsize = 0;
+		}
+		if rune != RuneError || size != wantsize {
+			t.Errorf("DecodeRune(%s) = 0x%04x, %d want 0x%04x, %d", CEscape(b[0:len(b)-1]), rune, size, RuneError, wantsize);
+		}
+
+		// make sure bad sequences fail
+		if len(b) == 1 {
+			b[0] = 0x80;
+		} else {
+			b[len(b)-1] = 0x7F;
+		}
+		rune, size = utf8.DecodeRune(b);
+		if rune != RuneError || size != 1 {
+			t.Errorf("DecodeRune(%s) = 0x%04x, %d want 0x%04x, %d", CEscape(b), rune, size, RuneError, 1);
+		}
+	}
+}