The Eclipse JavaScript Development Tools allow step-through-debugging of JavaScript files using a provided Rhino instance. The Wiki describes how to utilise Eclipse plugins to connect your own embedded Rhino context to Eclipse.
Versions: Java 7; Rhino 1.7R4; Eclipse Juno (4.2) SR1 (Eclipse IDE for Java EE Developers).
The simple task of trying to match strings without regard to upper or lower case is surprisingly hard when you try to take into account different language conventions. Things get more complicated when you start to consider accented letters and the legacy of typography.
This post discusses the Java 7 implementation which is documented to suport Unicode 6.0.0.
Note: graphemes will vary based on rendering engines and system fonts.
Mozilla's Rhino engine includes a step-through debugger. It is relatively easy to embed this in your own Java application.
Versions: Rhino 1.7R4 on Java 7.
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