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text_char.go
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text_char.go
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// Copyright 2021 The CDK Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use file except in compliance with the License.
// You may obtain a copy of the license at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package memphis
import (
"fmt"
"sync"
"unicode"
"unicode/utf8"
)
type TextChar interface {
Set(r rune)
SetByte(b []byte)
Width() int
Value() rune
String() string
IsSpace() bool
}
type CTextChar struct {
value rune
width int
sync.RWMutex
}
func NewTextChar(b []byte) *CTextChar {
t := &CTextChar{}
t.SetByte(b)
return t
}
func (c *CTextChar) Set(r rune) {
c.SetByte([]byte(string(r)))
}
func (c *CTextChar) SetByte(b []byte) {
c.value, c.width = utf8.DecodeRune(b)
}
func (c *CTextChar) Width() int {
return c.width
}
func (c *CTextChar) Value() rune {
return c.value
}
func (c *CTextChar) String() string {
if c.value == 0 {
return " "
}
return fmt.Sprintf("%c", c.value)
}
func (c *CTextChar) IsSpace() bool {
v := c.Value()
return v == 0 || unicode.IsSpace(v)
}