Regular Expression Parser

StateMachine for Regular Expression Parser

The Class RegularExpressionParser is defined with one attribute: bMatch.

A StateMachine is used to describe the regular expression (a|b)*abb

The transition triggers are specified as events a, b, x and reset
On entry to State4, bMatch is set to True; on exit from State4, bMatch is set to False
On entry to State5, bMatch is set to False
On self transition of State6, bMatch is set to False

Customize index.html and statemachineGUI.js

Make these changes to the generated files:

Create an HTML input field and an image to indicate the result
Create JavaScript as the field's oninput event handler
Create the function SetResult to toggle the pass/fail image
Create the function getEventStr, which will return 'a' on 'a' and 'b' on 'b', but will return 'x' on any other character
On initialize, broadcast 'reset'

In statemachineGUI.js, find the function onRuntimeValueResponse

In 'regxParser.bMatch', we will receive 'True' or 'False' and pass it into SetResult to update the image

The Complete Example

The example can be accessed from the 'Resources' page of the Sparx Systems website by clicking on this link: