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TiddlyWiki5/plugins/tiddlywiki/codemirror/engine.js

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/*\
title: $:/plugins/tiddlywiki/codemirror/engine.js
type: application/javascript
module-type: library
Text editor engine based on a CodeMirror instance
\*/
(function(){
/*jslint node: true, browser: true */
/*global $tw: false */
"use strict";
var CODEMIRROR_OPTIONS = "$:/config/CodeMirror",
HEIGHT_VALUE_TITLE = "$:/config/TextEditor/EditorHeight/Height"
// Install CodeMirror
if($tw.browser && !window.CodeMirror) {
window.CodeMirror = require("$:/plugins/tiddlywiki/codemirror/lib/codemirror.js");
// Install required CodeMirror plugins
var configOptions = $tw.wiki.getTiddlerData(CODEMIRROR_OPTIONS,{}),
req = configOptions.require;
if(req) {
if($tw.utils.isArray(req)) {
for(var index=0; index<req.length; index++) {
require(req[index]);
}
} else {
require(req);
}
}
}
function CodeMirrorEngine(options) {
// Save our options
var self = this;
options = options || {};
this.widget = options.widget;
this.value = options.value;
this.parentNode = options.parentNode;
this.nextSibling = options.nextSibling;
// Create the wrapper DIV
this.domNode = this.widget.document.createElement("div");
if(this.widget.editClass) {
this.domNode.className = this.widget.editClass;
}
this.domNode.style.display = "inline-block";
this.parentNode.insertBefore(this.domNode,this.nextSibling);
this.widget.domNodes.push(this.domNode);
// Get the configuration options for the CodeMirror object
var config = $tw.wiki.getTiddlerData(CODEMIRROR_OPTIONS,{}).configuration || {};
if(!("lineWrapping" in config)) {
config.lineWrapping = true;
}
if(!("lineNumbers" in config)) {
config.lineNumbers = true;
}
config.mode = options.type;
config.value = options.value;
// Create the CodeMirror instance
this.cm = window.CodeMirror(function(cmDomNode) {
// Note that this is a synchronous callback that is called before the constructor returns
self.domNode.appendChild(cmDomNode);
},config);
// Set up a change event handler
this.cm.on("change",function() {
self.widget.saveChanges(self.getText());
});
this.cm.on("drop",function(cm,event) {
event.stopPropagation(); // Otherwise TW's dropzone widget sees the drop event
return false;
});
this.cm.on("keydown",function(cm,event) {
return self.widget.handleKeydownEvent.call(self.widget,event);
});
}
/*
Set the text of the engine if it doesn't currently have focus
*/
CodeMirrorEngine.prototype.setText = function(text,type) {
this.cm.setOption("mode",type);
if(!this.cm.hasFocus()) {
this.cm.setValue(text);
}
};
/*
Get the text of the engine
*/
CodeMirrorEngine.prototype.getText = function() {
return this.cm.getValue();
};
/*
Fix the height of textarea to fit content
*/
CodeMirrorEngine.prototype.fixHeight = function() {
if(this.widget.editAutoHeight) {
// Resize to fit
this.cm.setSize(null,null);
} else {
var fixedHeight = parseInt(this.widget.wiki.getTiddlerText(HEIGHT_VALUE_TITLE,"400px"),10);
fixedHeight = Math.max(fixedHeight,20);
this.cm.setSize(null,fixedHeight);
}
};
/*
Focus the engine node
*/
CodeMirrorEngine.prototype.focus = function() {
this.cm.focus();
}
/*
Create a blank structure representing a text operation
*/
CodeMirrorEngine.prototype.createTextOperation = function() {
var selections = this.cm.listSelections();
if(selections.length > 0) {
var anchorPos = this.cm.indexFromPos(selections[0].anchor),
headPos = this.cm.indexFromPos(selections[0].head);
}
var operation = {
text: this.cm.getValue(),
selStart: Math.min(anchorPos,headPos),
selEnd: Math.max(anchorPos,headPos),
cutStart: null,
cutEnd: null,
replacement: null,
newSelStart: null,
newSelEnd: null
};
operation.selection = operation.text.substring(operation.selStart,operation.selEnd);
return operation;
};
/*
Execute a text operation
*/
CodeMirrorEngine.prototype.executeTextOperation = function(operation) {
// Perform the required changes to the text area and the underlying tiddler
var newText = operation.text;
if(operation.replacement !== null) {
this.cm.replaceRange(operation.replacement,this.cm.posFromIndex(operation.cutStart),this.cm.posFromIndex(operation.cutEnd));
this.cm.setSelection(this.cm.posFromIndex(operation.newSelStart),this.cm.posFromIndex(operation.newSelEnd));
newText = operation.text.substring(0,operation.cutStart) + operation.replacement + operation.text.substring(operation.cutEnd);
}
this.cm.focus();
return newText;
};
exports.CodeMirrorEngine = CodeMirrorEngine;
})();