forked from alexwarth/ometa-js
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workspace.js
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workspace.js
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/*
Copyright (c) 2007, 2008 Alessandro Warth <awarth@cs.ucla.edu>
Permission is hereby granted, free of charge, to any person
obtaining a copy of this software and associated documentation
files (the "Software"), to deal in the Software without
restriction, including without limitation the rights to use,
copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the
Software is furnished to do so, subject to the following
conditions:
The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
OTHER DEALINGS IN THE SOFTWARE.
*/
// 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 = ""
}
}