/* jslint node: true */
'use strict';
const miscUtil = require('./misc_util.js');
const ansi = require('./ansi_term.js');
const Log = require('./logger.js').log;
// deps
const events = require('events');
const util = require('util');
const _ = require('lodash');
exports.ANSIEscapeParser = ANSIEscapeParser;
const CR = 0x0d;
const LF = 0x0a;
function ANSIEscapeParser(options) {
var self = this;
events.EventEmitter.call(this);
this.column = 1;
this.row = 1;
this.scrollBack = 0;
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');
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() {
// :TODO: should be doing something with row/column?
self.emit('clear screen');
};
/*
self.rowUpdated = function() {
self.emit('row update', self.row + self.scrollBack);
};*/
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;
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 :
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;
}
//
// 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', {
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) {
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;
// ignore anything past EOF marker, if any
buffer = buffer.split(String.fromCharCode(0x1a), 1)[0];
do {
pos = re.lastIndex;
match = re.exec(buffer);
if(null !== match) {
if(match.index > pos) {
parseMCI(buffer.slice(pos, match.index));
}
opCode = match[2];
args = getArgArray(match[1].split(';'));
escape(opCode, args);
self.emit('chunk', match[0]);
}
} while(0 !== re.lastIndex);
if(pos < buffer.length) {
parseMCI(buffer.slice(pos));
}
self.emit('complete');
};
*/
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;
}
}
}
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);