You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
369 lines
10 KiB
369 lines
10 KiB
const {
|
|
ATTR_FG,
|
|
ATTR_BG,
|
|
ATTR_BOLD,
|
|
ATTR_UNDERLINE,
|
|
ATTR_BLINK,
|
|
ATTR_STRIKE,
|
|
ATTR_OVERLINE,
|
|
ATTR_FAINT
|
|
} = require('./screen_attr_bits')
|
|
|
|
// constants for decoding the update blob
|
|
const SEQ_SKIP = 1
|
|
const SEQ_REPEAT = 2
|
|
const SEQ_SET_COLORS = 3
|
|
const SEQ_SET_ATTRS = 4
|
|
const SEQ_SET_FG = 5
|
|
const SEQ_SET_BG = 6
|
|
const SEQ_SET_ATTR_0 = 7
|
|
|
|
// decode a number encoded as a unicode code point
|
|
function du (str) {
|
|
if (!str) return NaN
|
|
let num = str.codePointAt(0)
|
|
if (num > 0xDFFF) num -= 0x800
|
|
return num - 1
|
|
}
|
|
|
|
/* eslint-disable no-multi-spaces */
|
|
const TOPIC_SCREEN_OPTS = 'O'
|
|
const TOPIC_CONTENT = 'S'
|
|
const TOPIC_TITLE = 'T'
|
|
const TOPIC_BUTTONS = 'B'
|
|
const TOPIC_CURSOR = 'C'
|
|
const TOPIC_INTERNAL = 'D'
|
|
const TOPIC_BELL = '!'
|
|
const TOPIC_BACKDROP = 'W'
|
|
|
|
const OPT_CURSOR_VISIBLE = (1 << 0)
|
|
const OPT_DEBUGBAR = (1 << 1)
|
|
const OPT_CURSORS_ALT_MODE = (1 << 2)
|
|
const OPT_NUMPAD_ALT_MODE = (1 << 3)
|
|
const OPT_FN_ALT_MODE = (1 << 4)
|
|
const OPT_CLICK_TRACKING = (1 << 5)
|
|
const OPT_MOVE_TRACKING = (1 << 6)
|
|
const OPT_SHOW_BUTTONS = (1 << 7)
|
|
const OPT_SHOW_CONFIG_LINKS = (1 << 8)
|
|
// const OPT_CURSOR_SHAPE = (7 << 9)
|
|
const OPT_CRLF_MODE = (1 << 12)
|
|
const OPT_BRACKETED_PASTE = (1 << 13)
|
|
const OPT_REVERSE_VIDEO = (1 << 14)
|
|
|
|
/* eslint-enable no-multi-spaces */
|
|
|
|
/**
|
|
* A parser for screen update messages
|
|
*/
|
|
module.exports = class ScreenParser {
|
|
constructor () {
|
|
// true if full content was loaded
|
|
this.contentLoaded = false
|
|
}
|
|
|
|
parseUpdate (str) {
|
|
// console.log(`update ${str}`)
|
|
|
|
// current index
|
|
let ci = 0
|
|
let strArray = Array.from ? Array.from(str) : str.split('')
|
|
|
|
let text
|
|
const topics = du(strArray[ci++])
|
|
|
|
let collectOneTerminatedString = () => {
|
|
// TODO optimize this
|
|
text = ''
|
|
while (ci < strArray.length) {
|
|
let c = strArray[ci++]
|
|
if (c !== '\x01') {
|
|
text += c
|
|
} else {
|
|
break
|
|
}
|
|
}
|
|
return text
|
|
}
|
|
|
|
const updates = []
|
|
|
|
while (ci < strArray.length) {
|
|
const topic = strArray[ci++]
|
|
|
|
if (topic === TOPIC_SCREEN_OPTS) {
|
|
const height = du(strArray[ci++])
|
|
const width = du(strArray[ci++])
|
|
const theme = du(strArray[ci++])
|
|
const defFG = (du(strArray[ci++]) & 0xFFFF) | ((du(strArray[ci++]) & 0xFFFF) << 16)
|
|
const defBG = (du(strArray[ci++]) & 0xFFFF) | ((du(strArray[ci++]) & 0xFFFF) << 16)
|
|
|
|
// process attributes
|
|
const attributes = du(strArray[ci++])
|
|
|
|
const cursorVisible = !!(attributes & OPT_CURSOR_VISIBLE)
|
|
|
|
// HACK: input alts are formatted as arguments for Input#setAlts
|
|
const inputAlts = [
|
|
!!(attributes & OPT_CURSORS_ALT_MODE),
|
|
!!(attributes & OPT_NUMPAD_ALT_MODE),
|
|
!!(attributes & OPT_FN_ALT_MODE),
|
|
!!(attributes & OPT_CRLF_MODE)
|
|
]
|
|
|
|
const trackMouseClicks = !!(attributes & OPT_CLICK_TRACKING)
|
|
const trackMouseMovement = !!(attributes & OPT_MOVE_TRACKING)
|
|
|
|
// 0 - Block blink 2 - Block steady (1 is unused)
|
|
// 3 - Underline blink 4 - Underline steady
|
|
// 5 - I-bar blink 6 - I-bar steady
|
|
let cursorShape = (attributes >> 9) & 0x07
|
|
// if it's not zero, decrement such that the two most significant bits
|
|
// are the type and the least significant bit is the blink state
|
|
if (cursorShape > 0) cursorShape--
|
|
let cursorStyle = cursorShape >> 1
|
|
const cursorBlinking = !(cursorShape & 1)
|
|
if (cursorStyle === 0) cursorStyle = 'block'
|
|
else if (cursorStyle === 1) cursorStyle = 'line'
|
|
else cursorStyle = 'bar'
|
|
|
|
const showButtons = !!(attributes & OPT_SHOW_BUTTONS)
|
|
const showConfigLinks = !!(attributes & OPT_SHOW_CONFIG_LINKS)
|
|
|
|
const bracketedPaste = !!(attributes & OPT_BRACKETED_PASTE)
|
|
const reverseVideo = !!(attributes & OPT_REVERSE_VIDEO)
|
|
|
|
const debugEnabled = !!(attributes & OPT_DEBUGBAR)
|
|
|
|
updates.push({
|
|
topic: 'screen-opts',
|
|
width,
|
|
height,
|
|
theme,
|
|
defFG,
|
|
defBG,
|
|
cursorVisible,
|
|
cursorBlinking,
|
|
cursorStyle,
|
|
inputAlts,
|
|
trackMouseClicks,
|
|
trackMouseMovement,
|
|
showButtons,
|
|
showConfigLinks,
|
|
bracketedPaste,
|
|
reverseVideo,
|
|
debugEnabled
|
|
})
|
|
} else if (topic === TOPIC_CURSOR) {
|
|
// cursor position
|
|
const y = du(strArray[ci++])
|
|
const x = du(strArray[ci++])
|
|
const hanging = !!du(strArray[ci++])
|
|
|
|
updates.push({
|
|
topic: 'cursor',
|
|
x,
|
|
y,
|
|
hanging
|
|
})
|
|
} else if (topic === TOPIC_TITLE) {
|
|
updates.push({ topic: 'title', title: collectOneTerminatedString() })
|
|
} else if (topic === TOPIC_BUTTONS) {
|
|
const count = du(strArray[ci++])
|
|
|
|
let labels = []
|
|
for (let j = 0; j < count; j++) {
|
|
text = collectOneTerminatedString()
|
|
labels.push(text)
|
|
}
|
|
|
|
updates.push({
|
|
topic: 'button-labels',
|
|
labels
|
|
})
|
|
} else if (topic === TOPIC_BACKDROP) {
|
|
updates.push({ topic: 'backdrop', image: collectOneTerminatedString() })
|
|
} else if (topic === TOPIC_BELL) {
|
|
updates.push({ topic: 'bell' })
|
|
} else if (topic === TOPIC_INTERNAL) {
|
|
// debug info
|
|
|
|
const flags = du(strArray[ci++])
|
|
const cursorAttrs = du(strArray[ci++])
|
|
const regionStart = du(strArray[ci++])
|
|
const regionEnd = du(strArray[ci++])
|
|
const charsetGx = du(strArray[ci++])
|
|
const charsetG0 = strArray[ci++]
|
|
const charsetG1 = strArray[ci++]
|
|
const freeHeap = du(strArray[ci++])
|
|
const clientCount = du(strArray[ci++])
|
|
|
|
updates.push({
|
|
topic: 'internal',
|
|
flags,
|
|
cursorAttrs,
|
|
regionStart,
|
|
regionEnd,
|
|
charsetGx,
|
|
charsetG0,
|
|
charsetG1,
|
|
freeHeap,
|
|
clientCount
|
|
})
|
|
} else if (topic === TOPIC_CONTENT) {
|
|
// set screen content
|
|
const frameY = du(strArray[ci++])
|
|
const frameX = du(strArray[ci++])
|
|
const frameHeight = du(strArray[ci++])
|
|
const frameWidth = du(strArray[ci++])
|
|
|
|
// content
|
|
let fg = 7
|
|
let bg = 0
|
|
let attrs = 0
|
|
let cell = 0 // cell index
|
|
let lastChar = ' '
|
|
let frameLength = frameWidth * frameHeight
|
|
|
|
const MASK_LINE_ATTR = ATTR_UNDERLINE | ATTR_OVERLINE | ATTR_STRIKE
|
|
const MASK_BLINK = ATTR_BLINK
|
|
|
|
const cells = []
|
|
|
|
let pushCell = () => {
|
|
let hasFG = attrs & ATTR_FG
|
|
let hasBG = attrs & ATTR_BG
|
|
let cellFG = fg
|
|
let cellBG = bg
|
|
let cellAttrs = attrs
|
|
|
|
// use 0,0 if no fg/bg. this is to match back-end implementation
|
|
// and allow leaving out fg/bg setting for cells with none
|
|
if (!hasFG) cellFG = 0
|
|
if (!hasBG) cellBG = 0
|
|
|
|
// Remove blink attribute if it wouldn't have any effect
|
|
if ((cellAttrs & MASK_BLINK) &&
|
|
((lastChar === ' ' && ((cellAttrs & MASK_LINE_ATTR) === 0)) || // no line styles
|
|
(fg === bg && hasFG && hasBG) // invisible text
|
|
)
|
|
) {
|
|
cellAttrs ^= MASK_BLINK
|
|
}
|
|
|
|
// 8 dark system colors turn bright when bold
|
|
if ((cellAttrs & ATTR_BOLD) && !(cellAttrs & ATTR_FAINT) && hasFG && cellFG < 8) {
|
|
cellFG += 8
|
|
}
|
|
|
|
cells.push([lastChar, cellFG, cellBG, cellAttrs])
|
|
}
|
|
|
|
while (ci < strArray.length && cell < frameLength) {
|
|
let character = strArray[ci++]
|
|
let charCode = character.codePointAt(0)
|
|
|
|
let data, count
|
|
switch (charCode) {
|
|
case SEQ_REPEAT:
|
|
count = du(strArray[ci++])
|
|
for (let j = 0; j < count; j++) {
|
|
pushCell()
|
|
if (++cell > frameLength) break
|
|
}
|
|
break
|
|
|
|
case SEQ_SKIP:
|
|
cell += du(strArray[ci++])
|
|
break
|
|
|
|
case SEQ_SET_COLORS:
|
|
data = du(strArray[ci++])
|
|
fg = data & 0xFF
|
|
bg = (data >> 8) & 0xFF
|
|
break
|
|
|
|
case SEQ_SET_ATTRS:
|
|
data = du(strArray[ci++])
|
|
attrs = data & 0xFFFF
|
|
break
|
|
|
|
case SEQ_SET_ATTR_0:
|
|
attrs = 0
|
|
break
|
|
|
|
case SEQ_SET_FG:
|
|
data = du(strArray[ci++])
|
|
if (data & 0x10000) {
|
|
data &= 0xFFF
|
|
data |= (du(strArray[ci++]) & 0xFFF) << 12
|
|
data += 256
|
|
}
|
|
fg = data
|
|
break
|
|
|
|
case SEQ_SET_BG:
|
|
data = du(strArray[ci++])
|
|
if (data & 0x10000) {
|
|
data &= 0xFFF
|
|
data |= (du(strArray[ci++]) & 0xFFF) << 12
|
|
data += 256
|
|
}
|
|
bg = data
|
|
break
|
|
|
|
default:
|
|
if (charCode < 32) character = '\ufffd'
|
|
lastChar = character
|
|
pushCell()
|
|
cell++
|
|
}
|
|
}
|
|
|
|
updates.push({
|
|
topic: 'content',
|
|
frameX,
|
|
frameY,
|
|
frameWidth,
|
|
frameHeight,
|
|
cells
|
|
})
|
|
}
|
|
|
|
if (topics & 0x3B && !this.contentLoaded) {
|
|
updates.push({ topic: 'full-load-complete' })
|
|
this.contentLoaded = true
|
|
}
|
|
}
|
|
|
|
return updates
|
|
}
|
|
|
|
/**
|
|
* Parses a message from the server
|
|
* @param {string} message - the message
|
|
*/
|
|
parse (message) {
|
|
const content = message.substr(1)
|
|
const updates = []
|
|
|
|
// This is a good place for debugging the message
|
|
// console.log(message)
|
|
|
|
switch (message[0]) {
|
|
case 'U':
|
|
updates.push(...this.parseUpdate(content))
|
|
break
|
|
|
|
case 'G':
|
|
return [{
|
|
topic: 'notification',
|
|
content
|
|
}]
|
|
|
|
default:
|
|
console.warn(`Bad data message type; ignoring.\n${JSON.stringify(message)}`)
|
|
}
|
|
|
|
return updates
|
|
}
|
|
}
|
|
|