+ Initial source checkin

core/client_term.js

@@ -0,0 +1,101 @@
+/* jslint node: true */
+'use strict';
+
+//	ENiGMA½
+var logger		= require('./logger.js');
+
+var iconv		= require('iconv-lite');
+var assert		= require('assert');
+
+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 {
+				logger.log.warn({ encoding : enc }, 'Unknown encoding');
+			}
+		}
+	});
+
+	Object.defineProperty(this, 'termType', {
+		get : function() {
+			return termType;
+		},
+		set : function(ttype) {
+			termType = ttype.toLowerCase();
+
+			//
+			//	ANSI terminals should be encoded to CP437
+			//
+			if('ansi' == termType) {
+				this.outputEncoding = 'cp437';
+			} else {
+				//	:TODO: See how x84 does this -- only set if local/remote are binary
+				this.outputEncoding = 'utf8';
+			}
+		}
+	});
+
+	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() {
+	return 'ansi' === this.termType;
+};
+
+ClientTerminal.prototype.write = function(s) {
+	if(this.convertLF && typeof s === 'string') {
+		s = s.replace(/\n/g, '\r\n');
+	}
+
+	this.output.write(iconv.encode(s, this.outputEncoding));
+};