From 2a27089243369855b53c488c9957810cfd794799 Mon Sep 17 00:00:00 2001
From: Marcin Kulik <marcin.kulik@llp.pl>
Date: Thu, 17 Mar 2011 23:18:49 +0100
Subject: [PATCH] Added support for alternate screen buffer (1049 h/l codes)

---
 public/javascripts/ansi-interpreter.js |  12 +-
 public/javascripts/player.js           |   2 +-
 public/javascripts/terminal.js         | 163 ++++++++++++++++---------
 3 files changed, 114 insertions(+), 63 deletions(-)

diff --git a/public/javascripts/ansi-interpreter.js b/public/javascripts/ansi-interpreter.js
index 20a3dc5..b1ce571 100644
--- a/public/javascripts/ansi-interpreter.js
+++ b/public/javascripts/ansi-interpreter.js
@@ -59,17 +59,25 @@ SP.AnsiInterpreter.prototype = {
     "\x1b\\[\\?([\x30-\x3f]+)([hlsr])": function(data, match) { // private standards
       // h = Sets DEC/xterm specific mode (http://ttssh2.sourceforge.jp/manual/en/about/ctrlseq.html#decmode)
       // l = Resets mode (http://ttssh2.sourceforge.jp/manual/en/about/ctrlseq.html#mode)
-      // 1049 + h = Save cursor position, switch to alternate screen buffer, and clear screen.
-      // 1049 + l = Clear screen, switch to normal screen buffer, and restore cursor position.
       // 1001 + s = ?
       // 1001 + r = ?
 
       if (match[1] == '1049') {
         if (match[2] == 'h') {
+          // 1049 + h = Save cursor position, switch to alternate screen buffer, and clear screen.
           this.terminal.saveCursor();
+          this.terminal.switchToAlternateBuffer();
+          this.terminal.clearScreen();
         } else if (match[2] == 'l') {
+          // 1049 + l = Clear screen, switch to normal screen buffer, and restore cursor position.
+          this.terminal.clearScreen();
+          this.terminal.switchToNormalBuffer();
           this.terminal.restoreCursor();
         }
+      } else if (match[1] == '1002') {
+        // 2002 + h / l = mouse tracking stuff
+      } else if (match[1] == '1') {
+        // 1 + h / l = cursor keys stuff
       }
     },
 
diff --git a/public/javascripts/player.js b/public/javascripts/player.js
index c0098ba..c3eabb4 100644
--- a/public/javascripts/player.js
+++ b/public/javascripts/player.js
@@ -28,7 +28,7 @@ SP.Player.prototype = {
 
     var run = function() {
       var rest = this.interpreter.feed(this.currentData);
-      this.terminal.updateDirtyLines();
+      this.terminal.renderDirtyLines();
       var n = timing[1];
 
       if (rest.length > 0)
diff --git a/public/javascripts/terminal.js b/public/javascripts/terminal.js
index f96c4bb..ac862e6 100644
--- a/public/javascripts/terminal.js
+++ b/public/javascripts/terminal.js
@@ -3,7 +3,9 @@ SP.Terminal = function(cols, lines) {
   this.lines = lines;
   this.cursorLine = 0;
   this.cursorCol = 0;
-  this.lineData = [];
+  this.normalBuffer = [];
+  this.alternateBuffer = [];
+  this.lineData = this.normalBuffer;
   this.fg = this.bg = undefined;
   this.dirtyLines = [];
   this.initialize();
@@ -13,48 +15,65 @@ SP.Terminal.prototype = {
   initialize: function() {
     var container = $(".player .term");
     this.element = container;
-    for (l = 0; l < this.lines; l++) {
-      var row = $("<span class='line'>");
-      container.append(row);
-      container.append("\n");
-      this.lineData[l] = [];
-      this.updateLine(l);
+    this.renderLine(0); // we only need 1 line
+    this.element.css({ height: this.element.height() * this.lines });
+  },
+
+  getLine: function(n) {
+    n = (typeof n != "undefined" ? n : this.cursorLine);
+
+    var line = this.lineData[n];
+
+    if (typeof line == 'undefined') {
+      line = this.lineData[n] = [];
+      this.fill(n, 0, this.cols, ' ');
     }
+
+    return line;
   },
 
-  setSGR: function(codes) {
-    if (codes.length == 0) {
-      codes = [0];
+  clearScreen: function() {
+    this.lineData.length = 0;
+    this.cursorLine = this.cursorCol = 0;
+    this.element.empty();
+  },
+
+  switchToNormalBuffer: function() {
+    this.lineData = this.normalBuffer;
+    this.updateScreen();
+  },
+
+  switchToAlternateBuffer: function() {
+    this.lineData = this.alternateBuffer;
+    this.updateScreen();
+  },
+
+  renderLine: function(n) {
+    var html = this.getLine(n);
+
+    if (n == this.cursorLine) {
+      html = html.slice(0, this.cursorCol).concat(['<span class="cursor">' + (html[this.cursorCol] || '') + "</span>"], html.slice(this.cursorCol + 1) || []);
     }
 
-    for (var i=0; i<codes.length; i++) {
-      var n = codes[i];
+    var missingLines = this.lineData.length - this.element.find('.line').length;
 
-      if (n === 0) {
-        this.fg = this.bg = undefined;
-        this.bright = false;
-      } else if (n == 1) {
-        this.bright = true;
-      } else if (n >= 30 && n <= 37) {
-        this.fg = n - 30;
-      } else if (n >= 40 && n <= 47) {
-        this.bg = n - 40;
-      }
+    for (var i = 0; i < missingLines; i++) {
+      var row = $('<span class="line">');
+      this.element.append(row);
+      this.element.append("\n");
+      this.element.scrollTop(100000);//row.offset().top);
     }
-  },
 
-  updateLine: function(n) {
-    n = (typeof n != "undefined" ? n : this.cursorLine);
-    this.dirtyLines.push(n);
+    this.element.find(".line:eq(" + n + ")").html(html.join(''));
   },
 
-  updateDirtyLines: function() {
+  renderDirtyLines: function() {
     var updated = [];
 
     for (var i=0; i<this.dirtyLines.length; i++) {
       var n = this.dirtyLines[i];
       if (updated.indexOf(n) == -1) {
-        this._updateLine(n);
+        this.renderLine(n);
         updated.push(n);
       }
     }
@@ -62,17 +81,38 @@ SP.Terminal.prototype = {
     this.dirtyLines = [];
   },
 
-  _updateLine: function(n) {
-    var html;
+  updateLine: function(n) {
+    n = (typeof n != "undefined" ? n : this.cursorLine);
+    this.dirtyLines.push(n);
+  },
 
-    if (n == this.cursorLine) {
-      var text = this.lineData[n];
-      html = text.slice(0, this.cursorCol).concat(['<span class="cursor">' + (text[this.cursorCol] || '') + "</span>"], text.slice(this.cursorCol + 1) || []);
-    } else {
-      html = this.lineData[n];
+  updateScreen: function() {
+    this.dirtyLines = [];
+
+    for (var l=0; l<this.lineData.length; l++) {
+      this.dirtyLines.push(l);
     }
+  },
 
-    this.element.find(".line:eq(" + n + ")").html(html.join(''));
+  setSGR: function(codes) {
+    if (codes.length == 0) {
+      codes = [0];
+    }
+
+    for (var i=0; i<codes.length; i++) {
+      var n = codes[i];
+
+      if (n === 0) {
+        this.fg = this.bg = undefined;
+        this.bright = false;
+      } else if (n == 1) {
+        this.bright = true;
+      } else if (n >= 30 && n <= 37) {
+        this.fg = n - 30;
+      } else if (n >= 40 && n <= 47) {
+        this.bg = n - 40;
+      }
+    }
   },
 
   setCursorPos: function(line, col) {
@@ -101,27 +141,29 @@ SP.Terminal.prototype = {
   },
 
   cursorLeft: function() {
-    if (this.cursorCol > 0)
-      this.cursorCol = this.cursorCol - 1;
-    this.updateLine();
+    if (this.cursorCol > 0) {
+      this.cursorCol -= 1;
+      this.updateLine();
+    }
   },
 
   cursorRight: function() {
-    if (this.cursorCol < this.cols)
-      this.cursorCol = this.cursorCol + 1;
-    this.updateLine();
+    if (this.cursorCol < this.cols) {
+      this.cursorCol += 1;
+      this.updateLine();
+    }
   },
 
   cursorUp: function() {
-    if (this.cursorLine > 0)
-      this.cursorLine = this.cursorLine - 1;
-    this.updateLine(this.cursorLine);
-    this.updateLine(this.cursorLine+1);
+    if (this.cursorLine > 0) {
+      this.cursorLine -= 1;
+      this.updateLine(this.cursorLine);
+      this.updateLine(this.cursorLine+1);
+    }
   },
 
   cursorDown: function() {
-    if (this.cursorLine < this.lines)
-      this.cursorLine = this.cursorLine + 1;
+    this.cursorLine += 1;
     this.updateLine(this.cursorLine);
     this.updateLine(this.cursorLine-1);
   },
@@ -141,8 +183,8 @@ SP.Terminal.prototype = {
 
   bs: function() {
     if (this.cursorCol > 0) {
-      this.lineData[this.cursorLine][this.cursorCol - 1] = ' ';
-      this.cursorCol = this.cursorCol - 1;
+      this.getLine()[this.cursorCol - 1] = ' ';
+      this.cursorCol -= 1;
       this.updateLine();
     }
   },
@@ -157,7 +199,7 @@ SP.Terminal.prototype = {
       }
 
       this.fill(this.cursorLine, this.cursorCol, 1, text[i]);
-      this.cursorCol = this.cursorCol + 1;
+      this.cursorCol += 1;
     }
 
     this.updateLine();
@@ -165,8 +207,8 @@ SP.Terminal.prototype = {
 
   eraseData: function(n) {
     if (n == 0) {
-      this.eraseLine(n);
-      for (var l=this.cursorLine+1; l<this.lines; l++) {
+      this.eraseLine(0);
+      for (var l=this.cursorLine+1; l<this.lineData.length; l++) {
         this.lineData[l] = [];
         this.updateLine(l);
       }
@@ -177,7 +219,7 @@ SP.Terminal.prototype = {
       }
       this.eraseLine(n);
     } else if (n == 2) {
-      for (var l=0; l<this.lines; l++) {
+      for (var l=0; l<this.lineData.length; l++) {
         this.lineData[l] = [];
         this.updateLine(l);
       }
@@ -189,21 +231,21 @@ SP.Terminal.prototype = {
       this.fill(this.cursorLine, this.cursorCol, this.cols - this.cursorCol, ' ');
       // this.lineData[this.cursorLine] = this.lineData[this.cursorLine].slice(0, this.cursorCol);
       // this.lineData[this.cursorLine] = this.lineData[this.cursorLine].slice(0, this.cursorCol) + " ".times(this.cols - this.cursorCol);
-      this.updateLine(this.cursorLine);
+      this.updateLine();
     } else if (n == 1) {
       this.fill(this.cursorLine, 0, this.cursorCol, ' ');
       // this.lineData[this.cursorLine] = " ".times(this.cursorCol).split('').concat(this.lineData[this.cursorLine].slice(this.cursorCol));
       // this.lineData[this.cursorLine] = " ".times(this.cursorCol) + this.lineData[this.cursorLine].slice(this.cursorCol);
-      this.updateLine(this.cursorLine);
+      this.updateLine();
     } else if (n == 2) {
       this.fill(this.cursorLine, 0, this.cols, ' ');
       // this.lineData[this.cursorLine] = [] // " ".times(this.cols);
-      this.updateLine(this.cursorLine);
+      this.updateLine();
     }
   },
 
   reserveCharacters: function(n) {
-    var line = this.lineData[this.cursorLine];
+    var line = this.getLine();
     this.lineData[this.cursorLine] = line.slice(0, this.cursorCol).concat(" ".times(n).split(''), line.slice(this.cursorCol, this.cols - n));
     this.updateLine();
   },
@@ -231,10 +273,11 @@ SP.Terminal.prototype = {
 
     var char = prefix + char + postfix;
 
+    var lineArr = this.getLine(line);
+
     for (var i=0; i<n; i++) {
-      this.lineData[line][col+i] = char;
+      lineArr[col+i] = char;
     }
-    // this.lineData[line] = this.lineData[line].slice(0, col).concat(char, this.lineData[line].slice(col + 1));
   },
 
   blinkCursor: function() {