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# Opening a JavaScript debugger within Oxygen [JS Operations](https://www.oxygenxml.com/doc/versions/23.1/ug-editor/topics/dg-default-author-operations.html#dg-default-author-operations__jsoperation)
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# Alltogether: opening a JavaScript debugger within Oxygen [JS Operations](https://www.oxygenxml.com/doc/versions/23.1/ug-editor/topics/dg-default-author-operations.html#dg-default-author-operations__jsoperation) through inclusion
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Even though its authors state that this operation "[can be used to execute small pieces of Javascript code](https://github.com/oxygenxml/javascript-sample-operations)",
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all the Oxygen and Java public APIs are exposed and this operation can be used for fairly complex tasks.
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The main limitation is then the lack of a debugger and relying on logs rapidly becomes very tedious to develop complex code.
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The good news is that Oxygen uses Mozilla's [Rhino JavaScript engine](https://en.wikipedia.org/wiki/Rhino_(JavaScript_engine)) and that this engine comes with a
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[debugger](https://www-archive.mozilla.org/rhino/debugger.html).
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This rambling proposes a way to launch the debugger from a JS Operation.
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This rambling shows how a [debugger](../js-debugger) can be launched using an [inclusion](../js-include).
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## Installation
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To do so, add this function to your commons.js file:
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To do so:
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### 1) add the include() function to your commons.js file:
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```javascript
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include = function (filepath, isAbsolute) {
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if (isAbsolute === undefined || isAbsolute == false) {
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filepath = Packages.ro.sync.ecss.extensions.commons.operations.CommonsOperationsUtil.expandAndResolvePath(authorAccess, filepath);
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}
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var text = new java.lang.String(java.nio.file.Files.readAllBytes(java.nio.file.Paths. get (java.net.URI(filepath))));
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text = String(text);
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eval(text);
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}
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```
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### 2) create a debugger.js file:
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```javascript
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startDebugger = function () {
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@ -24,78 +28,32 @@ startDebugger = function () {
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}
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var context = Packages.org.mozilla.javascript.Context.getCurrentContext(); // Within the current context...
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var context = Packages.org.mozilla.javascript.Context.getCurrentContext();
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// Within the current context...
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var contextFactory = context.getFactory();
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var scope = Packages.org.mozilla.javascript.tools.shell.Environment(runnable.__parent__); // and the scope of the runnable variable's parent ...
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var main = Packages.org.mozilla.javascript.tools. debugger.Main.mainEmbedded(contextFactory, scope, 'Debugger'); // start a debugging session ...
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main.setExitAction(java.lang.Runnable(runnable)); // , clean the resources at exit time...
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main.setVisible(true); // and make it visible/
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var scope = Packages.org.mozilla.javascript.tools.shell.Environment(runnable.__parent__);
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// and the scope of the runnable variable's parent ...
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var main = Packages.org.mozilla.javascript.tools. debugger.Main.mainEmbedded(contextFactory, scope, 'Debugger');
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// start a debugging session ...
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main.setExitAction(java.lang.Runnable(runnable));
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// , clean the resources at exit time...
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main.setVisible(true);
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// and make it visible/
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}
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```
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And use it in the script parameter of the JS operation:
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### 3) Use these functions in your doOperation() method:
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```javascript
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doOperation = startDebugger;
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```
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To call the action which uses this operation, you can attach it to a menu or tool icon or just define a shortkey and you're done !
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Call this action and you'll pop up a nice vintage debugger :
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Use the File menu to open or run the file to debug (such as [test.js]):
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There are a few things to know before using it, though...
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## Limitations
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### Scope
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I haven't found a way to simply grab the current scope object in JavaScript and the closest method I have found is:
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```javascript
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Packages.org.mozilla.javascript.tools.shell.Environment(runnable.__parent__)
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```
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This creates a scope with everything in the runnable's parent's scope augmented with the environment variables with may not be present in the current scope.
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All the other methods I have tried gave scopes which were, on the contrary, reduced compared to the current scope and lacking, for instance, the authorAcces object
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without which you can't interact with Oxygen.
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### Functions seen as objects
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Just try it by yourself in the "evaluate" window:
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```javascript
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function a() {}
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b = function() {}
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```
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"a" is seen as an object and not as a function, meaning that you can't call it. "b" is, correctly, seen as a function.
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### Strict behavior on instanciation.
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The word "new" is mandatory when instanciating a "class" (which is not the case when a JS operation script is run out of the debugger):
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```javascript
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aclass = function () {
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this.setFoo(1);
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return this;
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doOperation = function () {
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include('debugger.js');
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startDebugger();
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}
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aclass.prototype.setFoo = function (v) {
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this.foo = v;
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}
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anObject = new aclass() ; // works as expected
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anobject = aclass(); // fails with a message saying that there is no setFoo function in the object
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```
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## See also
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More details on these hacks:
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* [debugger](../js-debugger)
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* [inclusion](../js-include)
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# Framework
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This directory includes the Oxygen sample framework on which ou can test the debugger but it should work on any framework.
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This directory includes the Oxygen sample framework on which ou can test these techniques but they should work on any framework.
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<project version="21.1">
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<meta>
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<filters directoryPatterns="" filePatterns="\Qjs-debugger.xpr\E" positiveFilePatterns="" showHiddenFiles="false"/>
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<options/>
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<options>
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<serialized version="21.1" xml:space="preserve">
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<serializableOrderedMap>
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<entry>
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<String>additional.frameworks.directories</String>
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<String-array>
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<String>/home/vdv/projects/pro/Remix/oxygen/frameworks/http___oxygen.remix.rece.hachette_livre.fr_oxygenUpdate.xml</String>
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<String>/home/vdv/projects/tea/dyomedea/ramblings/oxygen/js-debugger-include</String>
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</String-array>
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</entry>
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<entry>
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<String>key.editor.document.type.custom.locations.option.pane</String>
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<Boolean>true</Boolean>
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</entry>
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</serializableOrderedMap>
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</serialized>
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</options>
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</meta>
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<projectTree name="js-debugger.xpr">
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<projectTree name="js-debugger-include.xpr">
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<folder path="."/>
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</projectTree>
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</project>
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@ -93,6 +93,9 @@ anObject = new aclass() ; // works as expected
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anobject = aclass(); // fails with a message saying that there is no setFoo function in the object
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```
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## See also
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* [inclusion](../js-include)
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* [debugger + inclusion](../js-debugger-include)
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# Framework
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@ -2,7 +2,23 @@
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<project version="21.1">
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<meta>
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<filters directoryPatterns="" filePatterns="\Qjs-debugger.xpr\E" positiveFilePatterns="" showHiddenFiles="false"/>
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<options/>
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<options>
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<serialized version="21.1" xml:space="preserve">
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<serializableOrderedMap>
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<entry>
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<String>additional.frameworks.directories</String>
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<String-array>
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<String>/home/vdv/projects/pro/Remix/oxygen/frameworks/http___oxygen.remix.rece.hachette_livre.fr_oxygenUpdate.xml</String>
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<String>/home/vdv/projects/tea/dyomedea/ramblings/oxygen/js-debugger</String>
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</String-array>
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</entry>
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<entry>
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<String>key.editor.document.type.custom.locations.option.pane</String>
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<Boolean>true</Boolean>
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</entry>
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</serializableOrderedMap>
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</serialized>
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</options>
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</meta>
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<projectTree name="js-debugger.xpr">
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<folder path="."/>
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@ -31,9 +31,11 @@ doOperation = function () {
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## Limitations
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The function needs an authorAccess variable in order to resolve relative URIs and this variable is only available in the scope of the doOperation function. This means that you can't use it
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outside of this function call, like, for instance, in the global scope of the common.js script.
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## See also
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* [debugger](../js-debugger)
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* [debugger + inclusion](../js-debugger-include)
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# Framework
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This directory includes the Oxygen sample framework on which ou can test the debugger but it should work on any framework.
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This directory includes the Oxygen sample framework on which ou can test this techniwue but it should work on any framework.
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@ -2,9 +2,25 @@
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<project version="21.1">
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<meta>
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<filters directoryPatterns="" filePatterns="\Qjs-debugger.xpr\E" positiveFilePatterns="" showHiddenFiles="false"/>
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<options/>
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<options>
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<serialized version="21.1" xml:space="preserve">
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<serializableOrderedMap>
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<entry>
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<String>additional.frameworks.directories</String>
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<String-array>
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<String>/home/vdv/projects/pro/Remix/oxygen/frameworks/http___oxygen.remix.rece.hachette_livre.fr_oxygenUpdate.xml</String>
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<String>/home/vdv/projects/tea/dyomedea/ramblings/oxygen/js-include</String>
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</String-array>
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</entry>
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<entry>
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<String>key.editor.document.type.custom.locations.option.pane</String>
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<Boolean>true</Boolean>
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</entry>
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</serializableOrderedMap>
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</serialized>
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</options>
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</meta>
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<projectTree name="js-debugger.xpr">
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<projectTree name="js-include.xpr">
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<folder path="."/>
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</projectTree>
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</project>
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