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// streamtty.js - a pty client for jstty |
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// Copyright 2008 Jack Christopher Kastorff |
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(function(){ |
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|
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var repeatString = function (str, rep) { |
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var outstr = ''; |
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for (var i = 0; i < rep; i++) { |
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outstr += str; |
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} |
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return outstr; |
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}; |
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|
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var makeTable = function (width, height) { |
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var table = document.createElement("div"); |
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var arr = []; |
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for (var j = 1; j <= height; j++) { |
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var row = document.createElement("div"); |
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var arrrow = []; |
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row.style.fontFamily = '"ProFont", "Luxi Mono", "Monaco", "Courier", "Courier new", monospace'; |
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row.style.margin = '0'; |
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row.style.padding = '0'; |
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row.style.wordSpacing = '0'; |
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row.style.height = '1.2em'; |
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for (var i = 1; i <= width; i++) { |
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var charelem = document.createElement("pre"); |
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charelem.style.backgroundColor = '#000'; |
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charelem.style.color = '#FFF'; |
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charelem.style.display = 'inline'; |
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charelem.style.fontWeight = 'normal'; |
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charelem.style.textDecoration = 'none'; |
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charelem.style.letterSpacing = '0'; |
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charelem.style.margin = '0'; |
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charelem.style.padding = '0 0 0.2em 0'; |
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charelem.appendChild(document.createTextNode(" ")); |
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row.appendChild(charelem); |
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arrrow.push(charelem); |
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} |
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table.appendChild(row); |
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arr.push(arrrow); |
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} |
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return { "arr": arr, "elem": table }; |
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}; |
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|
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var setTextChunk = function (tb, r, index, stx) { |
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for (var i = 0; i < r.length; i++) { |
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tb.arr[index][i+stx].firstChild.replaceData(0, 1, r.charAt(i)); |
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} |
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}; |
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|
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var setBoldChunk = function (tb, r, index, stx) { |
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for (var i = 0; i < r.length; i++) { |
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tb.arr[index][i+stx].style.fontWeight = r.charAt(i) == 0 ? 'normal' : 'bold'; |
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} |
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}; |
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|
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var setUnderlineChunk = function (tb, r, index, stx) { |
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for (var i = 0; i < r.length; i++) { |
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tb.arr[index][i+stx].style.textDecoration = r.charAt(i) == 0 ? 'none' : 'underline'; |
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} |
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}; |
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|
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var clut = { 0: "#000", 1: "#D00", 2: "#0D0", 3: "#DD0", 4: "#00D", 5: "#D0D", 6: "#0DD", 7: "#DDD" }; |
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|
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var setFcolorChunk = function (tb, r, index, stx) { |
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for (var i = 0; i < r.length; i++) { |
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tb.arr[index][i+stx].style.color = clut[r.charAt(i)]; |
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} |
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}; |
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|
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var t = 0; |
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var setBcolorChunk = function (tb, r, index, stx) { |
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for (var i = 0; i < r.length; i++) { |
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tb.arr[index][i+stx].style.backgroundColor = clut[r.charAt(i)]; |
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} |
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}; |
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|
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var loadIFrame = function (tb, rowcaches, fr, width, height) { |
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var d = uncompressIFrameBlock(fr.d, width); |
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for (var i = 0; i < d.length; i++) { |
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setTextChunk(tb, d[i], i, 0); |
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rowcaches.d[i] = d[i]; |
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} |
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var B = uncompressIFrameBlock(fr.B, width); |
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for (var i = 0; i < B.length; i++) { |
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setBoldChunk(tb, B[i], i, 0); |
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rowcaches.B[i] = B[i]; |
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} |
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var U = uncompressIFrameBlock(fr.U, width); |
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for (var i = 0; i < U.length; i++) { |
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setUnderlineChunk(tb, U[i], i, 0); |
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rowcaches.U[i] = U[i]; |
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} |
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var f = uncompressIFrameBlock(fr.f, width); |
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for (var i = 0; i < f.length; i++) { |
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setFcolorChunk(tb, f[i], i, 0); |
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rowcaches.f[i] = f[i]; |
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} |
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var b = uncompressIFrameBlock(fr.b, width); |
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for (var i = 0; i < b.length; i++) { |
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setBcolorChunk(tb, b[i], i, 0); |
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rowcaches.b[i] = b[i]; |
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} |
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}; |
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|
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var uncompressIFrameBlock = function (d,width) { |
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var uncomp = []; |
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var last = null; |
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for (var i = 0; i < d.length; i++) { |
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var uncomprow = null; |
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if ( typeof d[i] == 'array' || typeof d[i] == 'object' ) { |
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if ( d[i][0] == "r" ) { |
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uncomprow = d[i][1]; |
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} else if ( d[i][0] == "a" ) { |
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uncomprow = repeatString(d[i][1], width); |
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} else { |
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throw new Error ("bad iframe data: subarray is not valid"); |
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} |
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} else if ( typeof d[i] == 'string' && d[i] == 'd' ) { |
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uncomprow = last; |
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} else { |
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throw new Error ("bad iframe data: unknown " + (typeof d[i]) + " in array"); |
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} |
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uncomp.push(uncomprow); |
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last = uncomprow; |
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} |
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return uncomp; |
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}; |
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|
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var loadPFrame = function (table, rowcaches, fr, width, height) { |
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if ( fr.d ) { |
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diffPushGeneric(table, annotatedPFrameBlock(fr.d, width), rowcaches.d, setTextChunk); |
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} |
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if ( fr.B ) { |
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diffPushGeneric(table, annotatedPFrameBlock(fr.B, width), rowcaches.B, setBoldChunk); |
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} |
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if ( fr.U ) { |
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diffPushGeneric(table, annotatedPFrameBlock(fr.U, width), rowcaches.U, setUnderlineChunk); |
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} |
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if ( fr.f ) { |
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diffPushGeneric(table, annotatedPFrameBlock(fr.f, width), rowcaches.f, setFcolorChunk); |
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} |
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if ( fr.b ) { |
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diffPushGeneric(table, annotatedPFrameBlock(fr.b, width), rowcaches.b, setBcolorChunk); |
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} |
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}; |
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|
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var diffPushGeneric = function (table, d, rowcache, set) { |
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// convert everything to line operations |
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for (var i = 0; i < d.length; i++) { |
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var e = d[i]; |
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if ( e[0] == "cp" ) { |
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set(table, rowcache[e[1]], e[2], 0); |
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rowcache[e[2]] = rowcache[e[1]]; |
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} else if ( e[0] == 'char' ) { |
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var r = e[1]; |
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var v = rowcache[r]; |
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var da = v.slice(0, e[2]) + e[3] + v.slice(e[2]+1); |
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set(table, e[3], e[1], e[2]); |
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rowcache[r] = da; |
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} else if ( e[0] == 'chunk' ) { |
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var r = e[1]; |
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var v = rowcache[r]; |
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var da = v.slice(0, e[2]) + e[4] + v.slice(e[3]+1); |
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set(table, e[4], e[1], e[2]); |
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rowcache[r] = da; |
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} else if ( e[0] == 'line' ) { |
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set(table, e[2], e[1], 0); |
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rowcache[e[1]] = e[2]; |
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} else { |
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throw new Error ("unknown p-frame item type " + e[0] + ", len " + e.length); |
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} |
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} |
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}; |
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|
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var annotatedPFrameBlock = function (frame, width) { |
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var ann = []; |
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for (var i = 0; i < frame.length; i++) { |
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var e = frame[i]; |
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if ( e[0] == 'cp' ) { |
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ann.push(e); |
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} else if ( e.length == 2 ) { |
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// raw line |
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if ( typeof e[1] == 'string' ) { |
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ann.push(['line', e[0], e[1]]); |
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} else if ( e[1][0] == "a" ) { |
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ann.push(['line', e[0], repeatString(e[1][1], width)]); |
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} else { |
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throw new Error ("p-frame corrupted: invalid 2-len"); |
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} |
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} else if ( e.length == 3 ) { |
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// char |
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ann.push(['char', e[0], e[1], e[2]]); |
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} else if ( e.length == 4 ) { |
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// chunk |
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if ( typeof e[3] == 'string' ) { |
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ann.push(['chunk', e[0], e[1], e[2], e[3]]); |
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} else if ( e[3][0] == 'a' ) { |
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ann.push(['chunk', e[0], e[1], e[2], repeatString(e[3][1], e[2]-e[1]+1)]); |
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} else { |
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throw new Error ("p-frame corrupted: invalid 4-len"); |
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} |
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} else { |
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throw new Error ("p-frame corrupted: no such thing as a " + e.length + "-len"); |
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} |
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} |
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return ann; |
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}; |
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|
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var handleCursor = function (table, bgcache, curpos, dx, dy) { |
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if ( typeof dx == 'number' || typeof dy == 'number' ) { |
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// make sure the old cursor position has been overwritten |
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setBcolorChunk(table, bgcache[curpos[1]-1].charAt(curpos[0]-1), curpos[1]-1, curpos[0]-1); |
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if ( typeof dx == 'number' ) { |
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curpos[0] = dx; |
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} |
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if ( typeof dy == 'number' ) { |
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curpos[1] = dy; |
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} |
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} |
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|
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// draw the cursor |
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table.arr[curpos[1]-1][curpos[0]-1].style.backgroundColor = '#FFF'; |
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}; |
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|
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var makeCache = function (ch, wid, hei) { |
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var c = []; |
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for (var y = 0; y < hei; y++) { |
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c.push( repeatString(ch, wid) ); |
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} |
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return c; |
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}; |
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|
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var newSendBuffer = function (h) { |
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if ( ! h.activeRequest && h.sendBuffer.length > 0 ) { |
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if ( h.timer ) clearTimeout(h.timer); |
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request(h, "user input", { keys: h.sendBuffer } ); |
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h.sendBuffer = ''; |
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} |
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}; |
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|
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var request = function (h, cmd, args) { |
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if ( h.activeRequest ) return; |
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var url = '/api?'; |
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args['type'] = cmd; |
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if ( h.id ) args['id'] = h.id; |
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var urlargs = []; |
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for (var k in args) { |
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urlargs.push( encodeURIComponent(k) + '=' + encodeURIComponent(args[k]) ); |
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} |
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url += urlargs.join("&"); |
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|
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h.activeRequest = true; |
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var req = new XMLHttpRequest(); |
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req.open("GET", url, true); |
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req.onreadystatechange = function () { |
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if ( req.readyState == 4 && req.status == 200 ) { |
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var data = eval('(' + req.responseText + ')'); |
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if ( typeof data == "undefined" ) { |
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alert("err: undefined"); |
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h.activeRequest = false; |
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req = null; |
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return; |
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} |
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if ( data.ok ) { |
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if ( data.id ) h.id = data.id; |
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if ( data.pframe ) { |
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loadPFrame(h.table, h.rowcaches, data.pframe, h.width, h.height); |
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if ( data.pframe.x && data.pframe.y ) { |
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handleCursor(h.table, h.rowcaches.b, h.curpos, data.pframe.x, data.pframe.y); |
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} |
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} |
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if ( data.iframe ) { |
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loadIFrame(h.table, h.rowcaches, data.iframe, h.width, h.height); |
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handleCursor(h.table, h.rowcaches.b, h.curpos, data.iframe.x, data.iframe.y); |
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} |
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h.timer = setTimeout( function () { request(h, "pframe", { }); }, h.timerlen.current ); |
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h.timerlen.current *= h.timerlen.step; |
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if ( h.timerlen.current > h.timerlen.max ) { |
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h.timerlen.current = h.timerlen.max; |
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} |
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h.activeRequest = false; |
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newSendBuffer(h); |
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} else { |
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h.activeRequest = false; |
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alert("err: " + data.error); |
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} |
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req = null; |
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return; |
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} else if ( req.readyState == 4 && req.status != 200 ) { |
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alert("err: response code " + req.status); |
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h.activeRequest = false; |
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req = null; |
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return; |
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} |
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}; |
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req.send(null); |
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}; |
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|
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var keyPressHandler = function (h, e) { |
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var str = String.fromCharCode(e.charCode); |
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h.sendBuffer += str; |
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h.timerlen.current = h.timerlen.min; |
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e.stopPropagation(); |
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e.preventDefault(); |
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newSendBuffer(h); |
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return false; |
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}; |
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|
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startStreamTTY = function (elem) { |
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while ( elem.firstChild ) { |
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elem.removeChild( elem.firstChild ); |
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} |
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|
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var width = 80; |
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var height = 24; |
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|
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var table = makeTable(width, height); |
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elem.appendChild(table.elem); |
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|
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var holder = { |
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'width': width, |
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'height': height, |
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'table': table, |
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'rowcaches': { |
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'd': makeCache(" ", width, height), |
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'f': makeCache("7", width, height), |
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'b': makeCache("0", width, height), |
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'B': makeCache("0", width, height), |
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'U': makeCache("0", width, height) |
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}, |
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'curpos': [1,1], |
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'sendBuffer': '', |
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'timerlen': { |
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'max': 15000, |
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'current': 100, |
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'min': 100, |
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'step': 1.05 |
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}, |
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'activeRequest': false, |
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}; |
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|
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document.body.addEventListener( "keypress", function (e) { return keyPressHandler(holder, e); }, true ); |
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|
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request(holder, "create session", {}); |
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}; |
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|
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}()); |
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