enigma-bbs/core/client_term.js

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/* jslint node: true */
'use strict';
// ENiGMA½
var Log = require('./logger.js').log;
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var iconv = require('iconv-lite');
var assert = require('assert');
var _ = require('lodash');
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iconv.extendNodeEncodings();
exports.ClientTerminal = ClientTerminal;
function ClientTerminal(output) {
this.output = output;
var self = this;
var outputEncoding = 'cp437';
assert(iconv.encodingExists(outputEncoding));
// convert line feeds such as \n -> \r\n
this.convertLF = true;
//
// Some terminal we handle specially
// They can also be found in this.env{}
//
var termType = 'unknown';
var termHeight = 0;
var termWidth = 0;
// Raw values set by e.g. telnet NAWS, ENVIRONMENT, etc.
this.env = {};
Object.defineProperty(this, 'outputEncoding', {
get : function() {
return outputEncoding;
},
set : function(enc) {
if(iconv.encodingExists(enc)) {
outputEncoding = enc;
} else {
Log.warn({ encoding : enc }, 'Unknown encoding');
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}
}
});
Object.defineProperty(this, 'termType', {
get : function() {
return termType;
},
set : function(ttype) {
termType = ttype.toLowerCase();
//
// ANSI terminals should be encoded to CP437
//
// Some terminal types provided by Mercyful Fate / Enthral:
// ANSI-BBS
// PC-ANSI
// QANSI
// SCOANSI
// VT100
// XTERM
// LINUX
// QNX
// SCREEN
//
if(this.isANSI()) {
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this.outputEncoding = 'cp437';
} else {
// :TODO: See how x84 does this -- only set if local/remote are binary
this.outputEncoding = 'utf8';
}
Log.debug( { encoding : this.outputEncoding }, 'Set output encoding due to terminal type change');
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}
});
Object.defineProperty(this, 'termWidth', {
get : function() {
return termWidth;
},
set : function(width) {
if(width > 0) {
termWidth = width;
}
}
});
Object.defineProperty(this, 'termHeight', {
get : function() {
return termHeight;
},
set : function(height) {
if(height > 0) {
termHeight = height;
}
}
});
}
ClientTerminal.prototype.isANSI = function() {
// :TODO: Others??
return [ 'ansi', 'pc-ansi', 'qansi', 'scoansi' ].indexOf(this.termType) > -1;
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};
ClientTerminal.prototype.write = function(s, convertLineFeeds) {
convertLineFeeds = _.isUndefined(convertLineFeeds) ? this.convertLF : convertLineFeeds;
if(convertLineFeeds && _.isString(s)) {
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s = s.replace(/\n/g, '\r\n');
}
this.output.write(iconv.encode(s, this.outputEncoding));
};