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* StateMachine Effects | * StateMachine Effects | ||
=== EAL Differences === | |||
When using EAL, one often wants to stack expressions | When using EAL, one often wants to stack expressions after each other. To allow for this, EAL has introduced an expression separator: The semicolon <code>;</code>. This means that you can build method bodies that do several things like this: | ||
self.SomeDateTime := DateTime.Now; | self.SomeDateTime := DateTime.Now; | ||
self.SomeInt := 27; | self.SomeInt := 27; | ||
self.SomeString := self.SomeDateTime.ToString('yyyy-MM-dd') | self.SomeString := self.SomeDateTime.ToString('yyyy-MM-dd') | ||
In EAL, we use | In EAL, we use <code>:=</code> to assign but <code>=</code> to compare. | ||
In EAL, we can also create new objects Thing.Create | In EAL, we can also create new objects <code>Thing.Create</code> | ||
Worth noting is that the expression separator | Worth noting is that the expression separator <code>;</code> can only be used between statements. So writing this <code>‘a string’;0</code> is of type integer. But writing this <code>‘a string’;0;</code> is of unknown type and hence wrong – the last statement that the parser expects after the last <code>;</code> is not found. | ||
[[Category:EAL]] | [[Category:EAL]] | ||
Revision as of 06:28, 22 June 2023
In MDriven, we want to change data when appropriate – so we use the same syntax as OCL in something we call EAL – ExtendedActionLanguage.
We use EAL in MDriven here:
- Action execute expression
- Actions in ViewModel columns Execute expression
- Class method implementations
- StateMachine Effects
EAL Differences
When using EAL, one often wants to stack expressions after each other. To allow for this, EAL has introduced an expression separator: The semicolon ;. This means that you can build method bodies that do several things like this:
self.SomeDateTime := DateTime.Now;
self.SomeInt := 27;
self.SomeString := self.SomeDateTime.ToString('yyyy-MM-dd')
In EAL, we use := to assign but = to compare.
In EAL, we can also create new objects Thing.Create
Worth noting is that the expression separator ; can only be used between statements. So writing this ‘a string’;0 is of type integer. But writing this ‘a string’;0; is of unknown type and hence wrong – the last statement that the parser expects after the last ; is not found.