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/*
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Copyright (c) 2007, 2008 Alessandro Warth <[email protected]>
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Permission is hereby granted, free of charge, to any person
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obtaining a copy of this software and associated documentation
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files (the "Software"), to deal in the Software without
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restriction, including without limitation the rights to use,
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copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the
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Software is furnished to do so, subject to the following
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conditions:
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The above copyright notice and this permission notice shall be
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included in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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OTHER DEALINGS IN THE SOFTWARE.
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*/
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// This code was adapted from Takashi Yamamiya's Javascript Workspace,
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// which you can visit at http://metatoys.org/propella/js/workspace.js
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// ---------------------------------------------------------------------------------------------------------------------------
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// INSTRUCTIONS: a client page must (1) include something along these lines:
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/*
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<body onLoad="$('workspaceForm').onkeydown=onShortCutKey">
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...
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<form id=workspaceForm>
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<b>Source</b><br>
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<textarea cols=132 rows=24 name=source>...</textarea><br>
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<input type=button value="print it (ctrl+p)" onClick="printIt()">
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<input type=button value="do it (ctrl+d)" onClick="doIt()">
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<br><br>
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<b>Translation</b>
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<br>
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<div id=translation>
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<textarea cols=132 rows=4 name=translation>
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</textArea>
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</div>
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<b>Transcript</b>
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<br>
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<div id=transcript>
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<textarea cols=132 rows=4 name=transcript></textArea>
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</div>
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</form>
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...
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</body>
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*/
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// and (2) define its own translateCode function
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function translateCode(s) {
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//throw { errorPos: 0 }
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return s
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}
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// ---------------------------------------------------------------------------------------------------------------------------
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/* event handler for short cut key */
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function onShortCutKey(evt) {
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evt = evt ? evt : window.event;
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if (!evt)
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return undefined;
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if (!(evt.altKey || evt.ctrlKey || evt.metaKey))
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return true;
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var charCode = evt.charCode ? evt.charCode : evt.keyCode
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try {
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var handledIt = true
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switch (charCode) {
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case 68: doIt(); break
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case 80: printIt(); break
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case 83: saveIt(); break
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default: handledIt = false; return true
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}
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}
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finally {
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if (handledIt) {
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if (evt.preventDefault) {
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evt.preventDefault()
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evt.stopPropagation()
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}
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else {
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evt.returnValue = false
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evt.cancelBubble = true
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}
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}
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}
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return false
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}
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function printIt() {
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var result = evalSelection()
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if (!result)
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return
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var editor = result.source.editor,
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end = result.source.end,
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head = editor.value.substring(0, end),
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tail = editor.value.substring(end),
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oldScrollTop = editor.scrollTop
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editor.value = head + result.result + tail;
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editor.scrollTop = oldScrollTop
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setCaretSelection(editor, end, head.length + result.result.length)
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}
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function doIt() {
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var result = evalSelection()
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if (result)
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result.source.editor.focus()
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}
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function saveIt() { }
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/* Get selection of textarea */
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function getCaretSelection(field) {
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field.focus();
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var result = { start: 0, end: 0 };
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// IE support based on http://groups.drupal.org/node/1210
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if(typeof $('workspaceForm').source.selectionEnd == "undefined") {
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var range = document.selection.createRange(),
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rangeCopy = range.duplicate()
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rangeCopy.moveToElementText(field)
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rangeCopy.setEndPoint( 'EndToEnd', range )
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result.start = rangeCopy.text.length - range.text.length
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result.end = result.start + range.text.length
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}
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else {
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result.start = field.selectionStart
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result.end = field.selectionEnd
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}
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return result
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}
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/* Set selection of textarea */
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function setCaretSelection(field, start, end) {
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field.focus()
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// IE
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if(typeof $('workspaceForm').source.selectionEnd == "undefined") {
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var range = field.createTextRange()
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range.expand("textedit")
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var dStart = start - (field.value.substring(0, start).split("\n").length - 1),
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dEnd = end - field.value.length + field.value.substring(end + 1).split("\n").length - 1
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range.moveStart("character", dStart)
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range.moveEnd("character", dEnd)
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range.select()
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}
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else {
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field.selectionStart = start
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field.selectionEnd = end
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}
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}
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/* Get expression from textarea */
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function getSource() {
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var editor = $('workspaceForm').source,
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selection = getCaretSelection(editor),
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start = selection.start,
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end = selection.end,
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text = editor.value.substring(start, end)
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if (start == end) {
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var alltext = editor.value, index = 0
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if (start > 0 && alltext.charAt(start) == "\n")
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start--
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while (start > 0 && alltext.charAt(start) != "\n")
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start--
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if (alltext.charAt(start) == "\n")
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start++
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while (end < alltext.length && alltext.charAt(end) != "\r" && alltext.charAt(end) != "\n")
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end++
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text = alltext.substring(start, end);
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setCaretSelection(editor, start, end);
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}
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return {
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editor: editor,
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start: start,
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end: end,
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text: text
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}
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}
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function evalSelection() {
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var source = getSource()
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try { $('workspaceForm').translation.value = translateCode(source.text) }
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catch (e) {
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if (e.errorPos != undefined) {
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var errorPos = source.start + e.errorPos
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errorMsg = " Parse error ->",
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oldScrollTop = $('workspaceForm').source.scrollTop
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$('workspaceForm').source.value = $('workspaceForm').source.value.substring(0, errorPos) + errorMsg +
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$('workspaceForm').source.value.substring(errorPos, $('workspaceForm').source.value.length)
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$('workspaceForm').source.scrollTop = oldScrollTop
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setCaretSelection($('workspaceForm').source, errorPos, errorPos + errorMsg.length)
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}
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return undefined
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}
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try {
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return {
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source: source,
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result: " " + eval($('workspaceForm').translation.value)
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}
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} catch (e) {
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alert("Oops!\n\n" + e)
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throw e
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}
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}
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Transcript = {
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show: function(x) {
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$('workspaceForm').transcript.value = $('workspaceForm').transcript.value + x + "\n"
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$('workspaceForm').transcript.scrollTop = $('workspaceForm').transcript.scrollHeight
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},
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clear: function() {
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$('workspaceForm').transcript.value = ""
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}
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}
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