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unicode/utf8: remove dependence on unicode.
The dependency was there only to pull in two constants. Now we define them locally and verify equality in the test. R=golang-dev, bradfitz CC=golang-dev https://golang.org/cl/5754046
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@ -6,12 +6,15 @@
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// UTF-8. It includes functions to translate between runes and UTF-8 byte sequences.
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package utf8
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import "unicode" // only needed for a couple of constants
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// The conditions RuneError==unicode.ReplacementChar and
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// MaxRune==unicode.MaxRune are verified in the tests.
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// Defining them locally avoids this package depending on package unicode.
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// Numbers fundamental to the encoding.
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const (
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RuneError = unicode.ReplacementChar // the "error" Rune or "replacement character".
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RuneError = '\uFFFD' // the "error" Rune or "Unicode replacement character"
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RuneSelf = 0x80 // characters below Runeself are represented as themselves in a single byte.
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MaxRune = '\U0010FFFF' // Maximum valid Unicode code point.
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UTFMax = 4 // maximum number of bytes of a UTF-8 encoded Unicode character.
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)
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@ -309,7 +312,7 @@ func EncodeRune(p []byte, r rune) int {
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return 2
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}
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if uint32(r) > unicode.MaxRune {
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if uint32(r) > MaxRune {
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r = RuneError
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}
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@ -7,9 +7,20 @@ package utf8_test
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import (
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"bytes"
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"testing"
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"unicode"
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. "unicode/utf8"
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)
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// Validate the constants redefined from unicode.
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func init() {
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if MaxRune != unicode.MaxRune {
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panic("utf8.MaxRune is wrong")
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}
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if RuneError != unicode.ReplacementChar {
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panic("utf8.RuneError is wrong")
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}
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}
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type Utf8Map struct {
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r rune
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str string
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