enigma-bbs/core/ansi_escape_parser.js

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/* jslint node: true */
'use strict';
const miscUtil = require('./misc_util.js');
const ansi = require('./ansi_term.js');
const Log = require('./logger.js').log;
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// deps
const events = require('events');
const util = require('util');
const _ = require('lodash');
exports.ANSIEscapeParser = ANSIEscapeParser;
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const CR = 0x0d;
const LF = 0x0a;
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function ANSIEscapeParser(options) {
var self = this;
events.EventEmitter.call(this);
this.column = 1;
this.graphicRendition = {};
this.parseState = {
re: /(?:\x1b\x5b)([?=;0-9]*?)([ABCDHJKfhlmnpsu])/g, // eslint-disable-line no-control-regex
};
options = miscUtil.valueWithDefault(options, {
mciReplaceChar: '',
termHeight: 25,
termWidth: 80,
trailingLF: 'default', // default|omit|no|yes, ...
});
this.mciReplaceChar = miscUtil.valueWithDefault(options.mciReplaceChar, '');
this.termHeight = miscUtil.valueWithDefault(options.termHeight, 25);
this.termWidth = miscUtil.valueWithDefault(options.termWidth, 80);
this.trailingLF = miscUtil.valueWithDefault(options.trailingLF, 'default');
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this.row = Math.min(options?.startRow ?? 1, this.termHeight);
self.moveCursor = function (cols, rows) {
self.column += cols;
self.row += rows;
self.column = Math.max(self.column, 1);
self.column = Math.min(self.column, self.termWidth); // can't move past term width
self.row = Math.max(self.row, 1);
self.positionUpdated();
};
self.saveCursorPosition = function () {
self.savedPosition = {
row: self.row,
column: self.column,
};
};
self.restoreCursorPosition = function () {
self.row = self.savedPosition.row;
self.column = self.savedPosition.column;
delete self.savedPosition;
self.positionUpdated();
// self.rowUpdated();
};
self.clearScreen = function () {
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self.column = 1;
self.row = 1;
self.emit('clear screen');
};
self.positionUpdated = function () {
self.emit('position update', self.row, self.column);
};
function literal(text) {
const len = text.length;
let pos = 0;
let start = 0;
let charCode;
let lastCharCode;
while (pos < len) {
charCode = text.charCodeAt(pos) & 0xff; // 8bit clean
switch (charCode) {
case CR:
self.emit('literal', text.slice(start, pos));
start = pos;
self.column = 1;
self.positionUpdated();
break;
case LF:
// Handle ANSI saved with UNIX-style LF's only
// vs the CRLF pairs
if (lastCharCode !== CR) {
self.column = 1;
}
self.emit('literal', text.slice(start, pos));
start = pos;
self.row += 1;
self.positionUpdated();
break;
default:
if (self.column === self.termWidth) {
self.emit('literal', text.slice(start, pos + 1));
start = pos + 1;
self.column = 1;
self.row += 1;
self.positionUpdated();
} else {
self.column += 1;
}
break;
}
++pos;
lastCharCode = charCode;
}
//
// Finalize this chunk
//
if (self.column > self.termWidth) {
self.column = 1;
self.row += 1;
self.positionUpdated();
}
const rem = text.slice(start);
if (rem) {
self.emit('literal', rem);
}
}
function parseMCI(buffer) {
// :TODO: move this to "constants" seciton @ top
var mciRe = /%([A-Z]{2})([0-9]{1,2})?(?:\(([0-9A-Za-z,]+)\))*/g;
var pos = 0;
var match;
var mciCode;
var args;
var id;
do {
pos = mciRe.lastIndex;
match = mciRe.exec(buffer);
if (null !== match) {
if (match.index > pos) {
literal(buffer.slice(pos, match.index));
}
mciCode = match[1];
id = match[2] || null;
if (match[3]) {
args = match[3].split(',');
} else {
args = [];
}
// if MCI codes are changing, save off the current color
var fullMciCode = mciCode + (id || '');
if (self.lastMciCode !== fullMciCode) {
self.lastMciCode = fullMciCode;
self.graphicRenditionForErase = _.clone(self.graphicRendition);
}
self.emit('mci', {
position: [self.row, self.column],
mci: mciCode,
id: id ? parseInt(id, 10) : null,
args: args,
SGR: ansi.getSGRFromGraphicRendition(self.graphicRendition, true),
});
if (self.mciReplaceChar.length > 0) {
const sgrCtrl = ansi.getSGRFromGraphicRendition(
self.graphicRenditionForErase
);
self.emit(
'control',
sgrCtrl,
'm',
sgrCtrl.slice(2).split(/[;m]/).slice(0, 3)
);
literal(new Array(match[0].length + 1).join(self.mciReplaceChar));
} else {
literal(match[0]);
}
}
} while (0 !== mciRe.lastIndex);
if (pos < buffer.length) {
literal(buffer.slice(pos));
}
}
self.reset = function (input) {
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self.column = 1;
self.row = Math.min(options?.startRow ?? 1, self.termHeight);
self.parseState = {
// ignore anything past EOF marker, if any
buffer: input.split(String.fromCharCode(0x1a), 1)[0],
re: /(?:\x1b\x5b)([?=;0-9]*?)([ABCDHJKfhlmnpsu])/g, // eslint-disable-line no-control-regex
stop: false,
};
};
self.stop = function () {
self.parseState.stop = true;
};
self.parse = function (input) {
if (input) {
self.reset(input);
}
// :TODO: ensure this conforms to ANSI-BBS / CTerm / bansi.txt for movement/etc.
var pos;
var match;
var opCode;
var args;
var re = self.parseState.re;
var buffer = self.parseState.buffer;
self.parseState.stop = false;
do {
if (self.parseState.stop) {
return;
}
pos = re.lastIndex;
match = re.exec(buffer);
if (null !== match) {
if (match.index > pos) {
parseMCI(buffer.slice(pos, match.index));
}
opCode = match[2];
args = match[1].split(';').map(v => parseInt(v, 10)); // convert to array of ints
escape(opCode, args);
//self.emit('chunk', match[0]);
self.emit('control', match[0], opCode, args);
}
} while (0 !== re.lastIndex);
if (pos < buffer.length) {
var lastBit = buffer.slice(pos);
// :TODO: check for various ending LF's, not just DOS \r\n
if ('\r\n' === lastBit.slice(-2).toString()) {
switch (self.trailingLF) {
case 'default':
//
// Default is to *not* omit the trailing LF
// if we're going to end on termHeight
//
if (this.termHeight === self.row) {
lastBit = lastBit.slice(0, -2);
}
break;
case 'omit':
case 'no':
case false:
lastBit = lastBit.slice(0, -2);
break;
}
}
parseMCI(lastBit);
}
self.emit('complete');
};
/*
self.parse = function(buffer, savedRe) {
// :TODO: ensure this conforms to ANSI-BBS / CTerm / bansi.txt for movement/etc.
// :TODO: move this to "constants" section @ top
var re = /(?:\x1b\x5b)([\?=;0-9]*?)([ABCDHJKfhlmnpsu])/g;
var pos = 0;
var match;
var opCode;
var args;
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// ignore anything past EOF marker, if any
buffer = buffer.split(String.fromCharCode(0x1a), 1)[0];
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do {
pos = re.lastIndex;
match = re.exec(buffer);
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if(null !== match) {
if(match.index > pos) {
parseMCI(buffer.slice(pos, match.index));
}
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opCode = match[2];
args = getArgArray(match[1].split(';'));
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escape(opCode, args);
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self.emit('chunk', match[0]);
}
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} while(0 !== re.lastIndex);
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if(pos < buffer.length) {
parseMCI(buffer.slice(pos));
}
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self.emit('complete');
};
*/
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function escape(opCode, args) {
let arg;
switch (opCode) {
// cursor up
case 'A':
//arg = args[0] || 1;
arg = isNaN(args[0]) ? 1 : args[0];
self.moveCursor(0, -arg);
break;
// cursor down
case 'B':
//arg = args[0] || 1;
arg = isNaN(args[0]) ? 1 : args[0];
self.moveCursor(0, arg);
break;
// cursor forward/right
case 'C':
//arg = args[0] || 1;
arg = isNaN(args[0]) ? 1 : args[0];
self.moveCursor(arg, 0);
break;
// cursor back/left
case 'D':
//arg = args[0] || 1;
arg = isNaN(args[0]) ? 1 : args[0];
self.moveCursor(-arg, 0);
break;
case 'f': // horiz & vertical
case 'H': // cursor position
//self.row = args[0] || 1;
//self.column = args[1] || 1;
self.row = isNaN(args[0]) ? 1 : args[0];
self.column = isNaN(args[1]) ? 1 : args[1];
//self.rowUpdated();
self.positionUpdated();
break;
// save position
case 's':
self.saveCursorPosition();
break;
// restore position
case 'u':
self.restoreCursorPosition();
break;
// set graphic rendition
case 'm':
self.graphicRendition.reset = false;
for (let i = 0, len = args.length; i < len; ++i) {
arg = args[i];
if (ANSIEscapeParser.foregroundColors[arg]) {
self.graphicRendition.fg = arg;
} else if (ANSIEscapeParser.backgroundColors[arg]) {
self.graphicRendition.bg = arg;
} else if (ANSIEscapeParser.styles[arg]) {
switch (arg) {
case 0:
// clear out everything
delete self.graphicRendition.intensity;
delete self.graphicRendition.underline;
delete self.graphicRendition.blink;
delete self.graphicRendition.negative;
delete self.graphicRendition.invisible;
delete self.graphicRendition.fg;
delete self.graphicRendition.bg;
self.graphicRendition.reset = true;
//self.graphicRendition.fg = 39;
//self.graphicRendition.bg = 49;
break;
case 1:
case 2:
case 22:
self.graphicRendition.intensity = arg;
break;
case 4:
case 24:
self.graphicRendition.underline = arg;
break;
case 5:
case 6:
case 25:
self.graphicRendition.blink = arg;
break;
case 7:
case 27:
self.graphicRendition.negative = arg;
break;
case 8:
case 28:
self.graphicRendition.invisible = arg;
break;
default:
Log.trace(
{ attribute: arg },
'Unknown attribute while parsing ANSI'
);
break;
}
}
}
self.emit('sgr update', self.graphicRendition);
break; // m
// :TODO: s, u, K
// erase display/screen
case 'J':
// :TODO: Handle other 'J' types!
if (2 === args[0]) {
self.clearScreen();
}
break;
}
}
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}
util.inherits(ANSIEscapeParser, events.EventEmitter);
ANSIEscapeParser.foregroundColors = {
30: 'black',
31: 'red',
32: 'green',
33: 'yellow',
34: 'blue',
35: 'magenta',
36: 'cyan',
37: 'white',
39: 'default', // same as white for most implementations
90: 'grey',
};
Object.freeze(ANSIEscapeParser.foregroundColors);
ANSIEscapeParser.backgroundColors = {
40: 'black',
41: 'red',
42: 'green',
43: 'yellow',
44: 'blue',
45: 'magenta',
46: 'cyan',
47: 'white',
49: 'default', // same as black for most implementations
};
Object.freeze(ANSIEscapeParser.backgroundColors);
// :TODO: ensure these names all align with that of ansi_term.js
//
// See the following specs:
// * http://www.ansi-bbs.org/ansi-bbs-core-server.html
// * http://www.vt100.net/docs/vt510-rm/SGR
// * https://github.com/protomouse/synchronet/blob/master/src/conio/cterm.txt
//
// Note that these are intentionally not in order such that they
// can be grouped by concept here in code.
//
ANSIEscapeParser.styles = {
0: 'default', // Everything disabled
1: 'intensityBright', // aka bold
2: 'intensityDim',
22: 'intensityNormal',
4: 'underlineOn', // Not supported by most BBS-like terminals
24: 'underlineOff', // Not supported by most BBS-like terminals
5: 'blinkSlow', // blinkSlow & blinkFast are generally treated the same
6: 'blinkFast', // blinkSlow & blinkFast are generally treated the same
25: 'blinkOff',
7: 'negativeImageOn', // Generally not supported or treated as "reverse FG & BG"
27: 'negativeImageOff', // Generally not supported or treated as "reverse FG & BG"
8: 'invisibleOn', // FG set to BG
28: 'invisibleOff', // Not supported by most BBS-like terminals
};
Object.freeze(ANSIEscapeParser.styles);