513 lines
10 KiB
Go
513 lines
10 KiB
Go
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// Copyright 2016 The TCell Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use file except in compliance with the License.
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// You may obtain a copy of the license at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package tcell
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import (
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"sync"
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"unicode/utf8"
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"golang.org/x/text/transform"
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)
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// NewSimulationScreen returns a SimulationScreen. Note that
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// SimulationScreen is also a Screen.
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func NewSimulationScreen(charset string) SimulationScreen {
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if charset == "" {
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charset = "UTF-8"
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}
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s := &simscreen{charset: charset}
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return s
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}
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// SimulationScreen represents a screen simulation. This is intended to
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// be a superset of normal Screens, but also adds some important interfaces
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// for testing.
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type SimulationScreen interface {
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// InjectKeyBytes injects a stream of bytes corresponding to
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// the native encoding (see charset). It turns true if the entire
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// set of bytes were processed and delivered as KeyEvents, false
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// if any bytes were not fully understood. Any bytes that are not
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// fully converted are discarded.
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InjectKeyBytes(buf []byte) bool
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// InjectKey injects a key event. The rune is a UTF-8 rune, post
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// any translation.
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InjectKey(key Key, r rune, mod ModMask)
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// InjectMouse injects a mouse event.
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InjectMouse(x, y int, buttons ButtonMask, mod ModMask)
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// SetSize resizes the underlying physical screen. It also causes
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// a resize event to be injected during the next Show() or Sync().
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// A new physical contents array will be allocated (with data from
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// the old copied), so any prior value obtained with GetContents
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// won't be used anymore
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SetSize(width, height int)
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// GetContents returns screen contents as an array of
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// cells, along with the physical width & height. Note that the
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// physical contents will be used until the next time SetSize()
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// is called.
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GetContents() (cells []SimCell, width int, height int)
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// GetCursor returns the cursor details.
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GetCursor() (x int, y int, visible bool)
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Screen
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}
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// SimCell represents a simulated screen cell. The purpose of this
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// is to track on screen content.
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type SimCell struct {
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// Bytes is the actual character bytes. Normally this is
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// rune data, but it could be be data in another encoding system.
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Bytes []byte
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// Style is the style used to display the data.
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Style Style
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// Runes is the list of runes, unadulterated, in UTF-8.
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Runes []rune
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}
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type simscreen struct {
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physw int
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physh int
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fini bool
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style Style
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evch chan Event
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quit chan struct{}
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front []SimCell
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back CellBuffer
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clear bool
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cursorx int
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cursory int
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cursorvis bool
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mouse bool
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charset string
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encoder transform.Transformer
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decoder transform.Transformer
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fillchar rune
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fillstyle Style
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fallback map[rune]string
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sync.Mutex
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}
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func (s *simscreen) Init() error {
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s.evch = make(chan Event, 10)
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s.quit = make(chan struct{})
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s.fillchar = 'X'
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s.fillstyle = StyleDefault
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s.mouse = false
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s.physw = 80
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s.physh = 25
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s.cursorx = -1
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s.cursory = -1
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s.style = StyleDefault
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if enc := GetEncoding(s.charset); enc != nil {
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s.encoder = enc.NewEncoder()
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s.decoder = enc.NewDecoder()
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} else {
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return ErrNoCharset
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}
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s.front = make([]SimCell, s.physw*s.physh)
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s.back.Resize(80, 25)
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// default fallbacks
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s.fallback = make(map[rune]string)
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for k, v := range RuneFallbacks {
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s.fallback[k] = v
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}
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return nil
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}
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func (s *simscreen) Fini() {
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s.Lock()
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s.fini = true
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s.back.Resize(0, 0)
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s.Unlock()
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if s.quit != nil {
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close(s.quit)
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}
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s.physw = 0
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s.physh = 0
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s.front = nil
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}
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func (s *simscreen) SetStyle(style Style) {
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s.Lock()
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s.style = style
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s.Unlock()
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}
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func (s *simscreen) Clear() {
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s.Fill(' ', s.style)
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}
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func (s *simscreen) Fill(r rune, style Style) {
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s.Lock()
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s.back.Fill(r, style)
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s.Unlock()
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}
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func (s *simscreen) SetCell(x, y int, style Style, ch ...rune) {
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if len(ch) > 0 {
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s.SetContent(x, y, ch[0], ch[1:], style)
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} else {
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s.SetContent(x, y, ' ', nil, style)
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}
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}
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func (s *simscreen) SetContent(x, y int, mainc rune, combc []rune, st Style) {
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s.Lock()
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s.back.SetContent(x, y, mainc, combc, st)
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s.Unlock()
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}
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func (s *simscreen) GetContent(x, y int) (rune, []rune, Style, int) {
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var mainc rune
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var combc []rune
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var style Style
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var width int
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s.Lock()
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mainc, combc, style, width = s.back.GetContent(x, y)
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s.Unlock()
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return mainc, combc, style, width
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}
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func (s *simscreen) drawCell(x, y int) int {
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mainc, combc, style, width := s.back.GetContent(x, y)
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if !s.back.Dirty(x, y) {
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return width
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}
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if x >= s.physw || y >= s.physh || x < 0 || y < 0 {
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return width
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}
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simc := &s.front[(y*s.physw)+x]
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if style == StyleDefault {
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style = s.style
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}
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simc.Style = style
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simc.Runes = append([]rune{mainc}, combc...)
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// now emit runes - taking care to not overrun width with a
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// wide character, and to ensure that we emit exactly one regular
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// character followed up by any residual combing characters
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simc.Bytes = nil
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if x > s.physw-width {
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simc.Runes = []rune{' '}
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simc.Bytes = []byte{' '}
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return width
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}
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lbuf := make([]byte, 12)
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ubuf := make([]byte, 12)
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nout := 0
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for _, r := range simc.Runes {
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l := utf8.EncodeRune(ubuf, r)
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nout, _, _ = s.encoder.Transform(lbuf, ubuf[:l], true)
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if nout == 0 || lbuf[0] == '\x1a' {
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// skip combining
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if subst, ok := s.fallback[r]; ok {
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simc.Bytes = append(simc.Bytes,
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[]byte(subst)...)
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} else if r >= ' ' && r <= '~' {
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simc.Bytes = append(simc.Bytes, byte(r))
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} else if simc.Bytes == nil {
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simc.Bytes = append(simc.Bytes, '?')
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}
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} else {
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simc.Bytes = append(simc.Bytes, lbuf[:nout]...)
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}
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}
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s.back.SetDirty(x, y, false)
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return width
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}
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func (s *simscreen) ShowCursor(x, y int) {
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s.Lock()
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s.cursorx, s.cursory = x, y
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s.showCursor()
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s.Unlock()
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}
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func (s *simscreen) HideCursor() {
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s.ShowCursor(-1, -1)
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}
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func (s *simscreen) showCursor() {
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x, y := s.cursorx, s.cursory
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if x < 0 || y < 0 || x >= s.physw || y >= s.physh {
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s.cursorvis = false
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} else {
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s.cursorvis = true
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}
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}
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func (s *simscreen) hideCursor() {
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// does not update cursor position
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s.cursorvis = false
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}
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func (s *simscreen) Show() {
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s.Lock()
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s.resize()
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s.draw()
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s.Unlock()
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}
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func (s *simscreen) clearScreen() {
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// We emulate a hardware clear by filling with a specific pattern
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for i := range s.front {
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s.front[i].Style = s.fillstyle
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s.front[i].Runes = []rune{s.fillchar}
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s.front[i].Bytes = []byte{byte(s.fillchar)}
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}
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s.clear = false
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}
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func (s *simscreen) draw() {
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s.hideCursor()
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if s.clear {
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s.clearScreen()
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}
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w, h := s.back.Size()
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for y := 0; y < h; y++ {
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for x := 0; x < w; x++ {
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width := s.drawCell(x, y)
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x += width - 1
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}
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}
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s.showCursor()
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}
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func (s *simscreen) EnableMouse() {
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s.mouse = true
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}
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func (s *simscreen) DisableMouse() {
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s.mouse = false
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}
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func (s *simscreen) Size() (int, int) {
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s.Lock()
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w, h := s.back.Size()
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s.Unlock()
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return w, h
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}
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func (s *simscreen) resize() {
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w, h := s.physw, s.physh
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ow, oh := s.back.Size()
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if w != ow || h != oh {
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s.back.Resize(w, h)
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ev := NewEventResize(w, h)
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s.PostEvent(ev)
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}
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}
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func (s *simscreen) Colors() int {
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return 256
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}
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func (s *simscreen) PollEvent() Event {
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select {
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case <-s.quit:
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return nil
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case ev := <-s.evch:
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return ev
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}
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}
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func (s *simscreen) PostEventWait(ev Event) {
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s.evch <- ev
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}
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func (s *simscreen) PostEvent(ev Event) error {
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select {
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case s.evch <- ev:
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return nil
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default:
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return ErrEventQFull
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}
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}
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func (s *simscreen) InjectMouse(x, y int, buttons ButtonMask, mod ModMask) {
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ev := NewEventMouse(x, y, buttons, mod)
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s.PostEvent(ev)
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}
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func (s *simscreen) InjectKey(key Key, r rune, mod ModMask) {
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ev := NewEventKey(key, r, mod)
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s.PostEvent(ev)
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}
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func (s *simscreen) InjectKeyBytes(b []byte) bool {
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failed := false
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outer:
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for len(b) > 0 {
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if b[0] >= ' ' && b[0] <= 0x7F {
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// printable ASCII easy to deal with -- no encodings
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ev := NewEventKey(KeyRune, rune(b[0]), ModNone)
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s.PostEvent(ev)
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b = b[1:]
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continue
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}
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if b[0] < 0x80 {
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mod := ModNone
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// No encodings start with low numbered values
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if Key(b[0]) >= KeyCtrlA && Key(b[0]) <= KeyCtrlZ {
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mod = ModCtrl
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}
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ev := NewEventKey(Key(b[0]), 0, mod)
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s.PostEvent(ev)
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continue
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}
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utfb := make([]byte, len(b)*4) // worst case
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for l := 1; l < len(b); l++ {
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s.decoder.Reset()
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nout, nin, _ := s.decoder.Transform(utfb, b[:l], true)
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||
|
|
if nout != 0 {
|
||
|
|
r, _ := utf8.DecodeRune(utfb[:nout])
|
||
|
|
if r != utf8.RuneError {
|
||
|
|
ev := NewEventKey(KeyRune, r, ModNone)
|
||
|
|
s.PostEvent(ev)
|
||
|
|
}
|
||
|
|
b = b[nin:]
|
||
|
|
continue outer
|
||
|
|
}
|
||
|
|
}
|
||
|
|
failed = true
|
||
|
|
b = b[1:]
|
||
|
|
continue
|
||
|
|
}
|
||
|
|
|
||
|
|
return !failed
|
||
|
|
}
|
||
|
|
|
||
|
|
func (s *simscreen) Sync() {
|
||
|
|
s.Lock()
|
||
|
|
s.clear = true
|
||
|
|
s.resize()
|
||
|
|
s.back.Invalidate()
|
||
|
|
s.draw()
|
||
|
|
s.Unlock()
|
||
|
|
}
|
||
|
|
|
||
|
|
func (s *simscreen) CharacterSet() string {
|
||
|
|
return s.charset
|
||
|
|
}
|
||
|
|
|
||
|
|
func (s *simscreen) SetSize(w, h int) {
|
||
|
|
s.Lock()
|
||
|
|
newc := make([]SimCell, w*h)
|
||
|
|
for row := 0; row < h && row < s.physh; row++ {
|
||
|
|
for col := 0; col < w && col < s.physw; col++ {
|
||
|
|
newc[(row*w)+col] = s.front[(row*s.physw)+col]
|
||
|
|
}
|
||
|
|
}
|
||
|
|
s.cursorx, s.cursory = -1, -1
|
||
|
|
s.physw, s.physh = w, h
|
||
|
|
s.front = newc
|
||
|
|
s.back.Resize(w, h)
|
||
|
|
s.Unlock()
|
||
|
|
}
|
||
|
|
|
||
|
|
func (s *simscreen) GetContents() ([]SimCell, int, int) {
|
||
|
|
s.Lock()
|
||
|
|
cells, w, h := s.front, s.physw, s.physh
|
||
|
|
s.Unlock()
|
||
|
|
return cells, w, h
|
||
|
|
}
|
||
|
|
|
||
|
|
func (s *simscreen) GetCursor() (int, int, bool) {
|
||
|
|
s.Lock()
|
||
|
|
x, y, vis := s.cursorx, s.cursory, s.cursorvis
|
||
|
|
s.Unlock()
|
||
|
|
return x, y, vis
|
||
|
|
}
|
||
|
|
|
||
|
|
func (s *simscreen) RegisterRuneFallback(r rune, subst string) {
|
||
|
|
s.Lock()
|
||
|
|
s.fallback[r] = subst
|
||
|
|
s.Unlock()
|
||
|
|
}
|
||
|
|
|
||
|
|
func (s *simscreen) UnregisterRuneFallback(r rune) {
|
||
|
|
s.Lock()
|
||
|
|
delete(s.fallback, r)
|
||
|
|
s.Unlock()
|
||
|
|
}
|
||
|
|
|
||
|
|
func (s *simscreen) CanDisplay(r rune, checkFallbacks bool) bool {
|
||
|
|
|
||
|
|
if enc := s.encoder; enc != nil {
|
||
|
|
nb := make([]byte, 6)
|
||
|
|
ob := make([]byte, 6)
|
||
|
|
num := utf8.EncodeRune(ob, r)
|
||
|
|
|
||
|
|
enc.Reset()
|
||
|
|
dst, _, err := enc.Transform(nb, ob[:num], true)
|
||
|
|
if dst != 0 && err == nil && nb[0] != '\x1A' {
|
||
|
|
return true
|
||
|
|
}
|
||
|
|
}
|
||
|
|
if !checkFallbacks {
|
||
|
|
return false
|
||
|
|
}
|
||
|
|
if _, ok := s.fallback[r]; ok {
|
||
|
|
return true
|
||
|
|
}
|
||
|
|
return false
|
||
|
|
}
|
||
|
|
|
||
|
|
func (s *simscreen) HasMouse() bool {
|
||
|
|
return false
|
||
|
|
}
|
||
|
|
|
||
|
|
func (s *simscreen) Resize(int, int, int, int) {}
|
||
|
|
|
||
|
|
func (s *simscreen) HasKey(Key) bool {
|
||
|
|
return true
|
||
|
|
}
|
||
|
|
|
||
|
|
func (s *simscreen) Beep() error {
|
||
|
|
return nil
|
||
|
|
}
|