Changes

The original code for Processing.js used regular expressions to convert Java into JavaScript when it was encountered. It did this by scanning for hints of Java code within the entire sketch and then replaced the Java code with its JavaScript equivalent. Due to the difference in how Java and JavaScript accessed object properties from methods inside an object, the with statement was used as a simple solution to avoid having to prepend all function calls with "this." or "Processing.". However, the use of the with statement also meant that the JavaScript generated would fall off Trace /*cite trace paper here... do we need to talk about trace in the back ground section???*/ making the code run slower than it needed to in some browsers. Later In later versions of Processing.js this method of scanning the entire sketch was replaced by the creation of an abstract syntax tree that broke up the code up the sketch into smaller pieces. Each piece was then had the regular expressions applied to change itinterpreted separately. This change made it was easier to apply the regular expressions correctly without accidentally converting code that was already working. It also made it easier to create proper inheritance structures and attach properties and methods to interpretation of the correct object in the hierarchy chain as smaller pieces of code was being converted at any one timesketch far cleaner.