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workspace.js
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workspace.js
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// This code was adapted from Takashi Yamamiya's Javascript Workspace,
// which you can visit at http://metatoys.org/propella/js/workspace.js
// ---------------------------------------------------------------------------------------------------------------------------
// INSTRUCTIONS: a client page must (1) include something along these lines:
/*
<body onLoad="$('workspaceForm').onkeydown=onShortCutKey">
...
<form id=workspaceForm>
<b>Source</b><br>
<textarea cols=132 rows=24 name=source>...</textarea><br>
<input type=button value="print it (ctrl+p)" onClick="printIt()">
<input type=button value="do it (ctrl+d)" onClick="doIt()">
<br><br>
<b>Translation</b>
<br>
<div id=translation>
<textarea cols=132 rows=4 name=translation>
</textArea>
</div>
<b>Transcript</b>
<br>
<div id=transcript>
<textarea cols=132 rows=4 name=transcript></textArea>
</div>
</form>
...
</body>
*/
// and (2) define its own translateCode function
function translateCode(s) {
//throw { errorPos: 0 }
return s
}
// ---------------------------------------------------------------------------------------------------------------------------
/* event handler for short cut key */
function onShortCutKey(evt) {
evt = evt ? evt : window.event;
if (!evt)
return undefined;
if (!(evt.altKey || evt.ctrlKey || evt.metaKey))
return true;
var charCode = evt.charCode ? evt.charCode : evt.keyCode
try {
var handledIt = true
switch (charCode) {
case 68: doIt(); break
case 80: printIt(); break
case 83: saveIt(); break
default: handledIt = false; return true
}
}
finally {
if (handledIt) {
if (evt.preventDefault) {
evt.preventDefault()
evt.stopPropagation()
}
else {
evt.returnValue = false
evt.cancelBubble = true
}
}
}
return false
}
function printIt() {
var result = evalSelection()
if (!result)
return
var editor = result.source.editor,
end = result.source.end,
head = editor.value.substring(0, end),
tail = editor.value.substring(end),
oldScrollTop = editor.scrollTop
editor.value = head + result.result + tail;
editor.scrollTop = oldScrollTop
setCaretSelection(editor, end, head.length + result.result.length)
}
function doIt() {
var result = evalSelection()
if (result)
result.source.editor.focus()
}
function saveIt() { }
/* Get selection of textarea */
function getCaretSelection(field) {
field.focus();
var result = { start: 0, end: 0 };
// IE support based on http://groups.drupal.org/node/1210
if(typeof $('workspaceForm').source.selectionEnd == "undefined") {
var range = document.selection.createRange(),
rangeCopy = range.duplicate()
rangeCopy.moveToElementText(field)
rangeCopy.setEndPoint( 'EndToEnd', range )
result.start = rangeCopy.text.length - range.text.length
result.end = result.start + range.text.length
}
else {
result.start = field.selectionStart
result.end = field.selectionEnd
}
return result
}
/* Set selection of textarea */
function setCaretSelection(field, start, end) {
field.focus()
// IE
if(typeof $('workspaceForm').source.selectionEnd == "undefined") {
var range = field.createTextRange()
range.expand("textedit")
var dStart = start - (field.value.substring(0, start).split("\n").length - 1),
dEnd = end - field.value.length + field.value.substring(end + 1).split("\n").length - 1
range.moveStart("character", dStart)
range.moveEnd("character", dEnd)
range.select()
}
else {
field.selectionStart = start
field.selectionEnd = end
}
}
/* Get expression from textarea */
function getSource() {
var editor = $('workspaceForm').source,
selection = getCaretSelection(editor),
start = selection.start,
end = selection.end,
text = editor.value.substring(start, end)
if (start == end) {
var alltext = editor.value, index = 0
if (start > 0 && alltext.charAt(start) == "\n")
start--
while (start > 0 && alltext.charAt(start) != "\n")
start--
if (alltext.charAt(start) == "\n")
start++
while (end < alltext.length && alltext.charAt(end) != "\r" && alltext.charAt(end) != "\n")
end++
text = alltext.substring(start, end);
setCaretSelection(editor, start, end);
}
return {
editor: editor,
start: start,
end: end,
text: text
}
}
function evalSelection() {
var source = getSource()
try { $('workspaceForm').translation.value = translateCode(source.text) }
catch (e) {
if (e.errorPos != undefined) {
var errorPos = source.start + e.errorPos
errorMsg = " Parse error ->",
oldScrollTop = $('workspaceForm').source.scrollTop
$('workspaceForm').source.value = $('workspaceForm').source.value.substring(0, errorPos) + errorMsg +
$('workspaceForm').source.value.substring(errorPos, $('workspaceForm').source.value.length)
$('workspaceForm').source.scrollTop = oldScrollTop
setCaretSelection($('workspaceForm').source, errorPos, errorPos + errorMsg.length)
}
return undefined
}
try {
return {
source: source,
result: " " + eval($('workspaceForm').translation.value)
}
} catch (e) {
alert("Oops!\n\n" + e)
throw e
}
}
Transcript = {
show: function(x) {
$('workspaceForm').transcript.value = $('workspaceForm').transcript.value + x + "\n"
$('workspaceForm').transcript.scrollTop = $('workspaceForm').transcript.scrollHeight
},
clear: function() {
$('workspaceForm').transcript.value = ""
}
}