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annotate termemu.js @ 89:6145e1ea7ace

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RLG-Web: add a new message framework. Add a message() function meant for UI messages, not debugging info.
author John "Elwin" Edwards <elwin@sdf.org>
date Tue, 10 Jul 2012 08:08:54 -0700
parents 7a50b4412fea
children a4d3ecf188b7
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1 /* termemu.js: a mostly xterm-compatible terminal emulator for a webpage */
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2 /* SELF-HOSTING 2011-09-23 */
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3
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4 // How detailed the debugging should be.
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5 var debugSuppress = 1;
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6 // Some char values.
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7 var csiPre = [63, 62, 33];
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8 var csiPost = [36, 34, 39, 32];
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9 function csiFinal(code) {
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10 /* @A-Z */
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11 if (code >= 64 && code <= 90)
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12 return true;
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13 /* `a-z{| */
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14 if (code >= 96 && code <= 124)
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15 return true;
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16 return false;
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17 }
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18 var esc7ctl = [68, 69, 72, 77, 78, 79, 80, 86, 87, 88, 90, 91, 92, 93, 94, 95];
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19 var escSingle = [55, 56, 61, 62, 70, 99, 108, 109, 110, 111, 124, 125, 126];
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20 var escDouble = [32, 35, 37, 40, 41, 42, 43, 45, 46, 47];
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21
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22 var decChars = {96: 0x2666, 97: 0x2592, 102: 0xB0, 103: 0xB1,
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23 106: 0x2518, 107: 0x2510, 108: 0x250C, 109: 0x2514,
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24 110: 0x253C, 111: 0x23BA, 112: 0x23BB, 113: 0x2500,
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25 114: 0x23BC, 115: 0x23BD, 116: 0x251C, 117: 0x2524,
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26 118: 0x2534, 119: 0x252C, 120: 0x2502, 121: 0x2264,
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27 122: 0x2265, 123: 0x03C0, 124: 0x2260, 125: 0xA3, 126: 0xB7};
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28
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29 /* Not everything that should be saved by DECSC has been implemented yet. */
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30 function Cursor(src) {
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31 if (src) {
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32 this.x = src.x;
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33 this.y = src.y;
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34 this.bold = src.bold;
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35 this.inverse = src.inverse;
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36 this.uline = src.uline;
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37 this.fg = src.fg;
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38 this.bg = src.bg;
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39 this.cset = src.cset;
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40 }
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41 else {
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42 this.x = 0;
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43 this.y = 0;
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44 this.bold = false;
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45 this.inverse = false;
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46 this.uline = false;
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47 this.fg = null;
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48 this.bg = null;
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49 this.cset = "B";
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50 }
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51 return;
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52 }
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53
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54 // An object representing the terminal emulator.
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55 var termemu = {
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56 /* Some elements of the page. */
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57 inwrap: null, // A non-table div wrapping the screen
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58 view: null, // The div holding the terminal screen
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59 screen: null, // The div representing the active screen area
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60 normbuf: null, // The normal screen buffer
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61 altbuf: null, // The alternate screen buffer
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62 histbuf: null, // The screen history buffer
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63 /* Attributes */
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64 w: 0, // Screen width
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65 h: 0, // Screen height
0
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66 fgColor: "#b2b2b2", // Default color for text
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67 bgColor: "black", // Default background color
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68 scrT: 0, // top and bottom of scrolling region
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69 scrB: 0, // init() will set this properly
0
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70 c: null, // Contains cursor position and text attributes
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71 offedge: false, // Going off the edge doesn't mean adding a new line
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72 clearAttrs: function () {
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73 /* Make sure to reset ALL attribute properties and NOTHING else. */
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74 this.c.bold = false;
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75 this.c.inverse = false;
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76 this.c.uline = false;
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77 this.c.fg = null;
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78 this.c.bg = null;
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79 },
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80 saved: null, // saved cursor
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81 normc: null, // Stores the normal screen buffer cursor when using altbuf
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82 ansicolors: ["#000000", "#b21818", "#18b218", "#b26818", "#1818b2",
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83 "#b218b2", "#18b2b2", "#b2b2b2"],
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84 brightcolors: ["#686868", "#ff5454", "#54ff54", "#ffff54", "#5454ff",
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85 "#ff54ff", "#54ffff", "#ffffff"],
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86 cssColor: function (fg) {